Add --conf-script

The circumstances under which actions occur depending on
configuration is now controlled only by newaddress() in network.c

CHANGELOG

@@ -1,3 +1,55 @@
+version 2.87
+        Allow arbitrary prefix lengths in --rev-server and
+	--domain=....,local
+
+	Replace --address=/#/..... functionality which got
+	missed in the 2.86 domain search rewrite.
+
+	Add --nftset option, like --ipset but for the newer nftables.
+	Thanks to Chen Zhenge for the patch.
+	
+	Add --filter-A and --filter-AAAA options, to remove IPv4 or IPv6
+	addresses from DNS answers.
+
+	Fix crash doing netbooting when --port is set to zero
+	to disable the DNS server. Thanks to Drexl Johannes
+	for the bug report.
+
+	Generalise --dhcp-relay. Sending via broadcast/multicast is
+	now supported for both IPv4 and IPv6 and the configuration
+	syntax made easier (but backwards compatible).
+	
+	Add snooping of IPv6 prefix-delegations to the DHCP-relay system.
+
+	Finesse parsing of --dhcp-remoteid and --dhcp-subscrid. To be treated
+	as hex, the pattern must consist of only hex digits AND contain
+	at least one ':'. Thanks to Bengt-Erik Sandstrom who tripped
+	over a pattern consisting of a decimal number which was interpreted
+	surprisingly.
+
+	Include client address in TFTP file-not-found error reports.
+	Thanks to Stefan Rink for the initial patch, which has been
+	re-worked by me (srk). All bugs mine.
+
+	Note in manpage the change in behaviour of -address. This behaviour
+	actually changed in v2.86, but was undocumented there. From 2.86 on,
+	(eg) --address=/example.com/1.2.3.4 ONLY applies to A queries. All other
+	types of query will be sent upstream. Pre 2.86, that would catch the
+	whole example.com domain and queries for other types would get
+	a local NODATA answer. The pre-2.86 behaviour is still available,
+	by configuring --address=/example.com/1.2.3.4 --local=/example.com/
+
+        Fix problem with binding DHCP sockets to an individual interface.
+	Despite the fact that the system call tales the interface _name_ as
+	a parameter, it actually, binds the socket to interface _index_.
+	Deleting the interface and creating a new one with the same name
+	leaves the socket bound to the old index. (Creating new sockets
+	always allocates a fresh index, they are not reused). We now
+	take this behaviour into account and keep up with changing indexes.
+
+	Add --conf-script configuration option.
+
+	
 version 2.86
 	Handle DHCPREBIND requests in the DHCPv6 server code.
 	Thanks to Aichun Li for spotting this omission, and the initial
@@ -92,6 +144,9 @@ version 2.86
 	of filename). Thanks to Ed Wildgoose for the initial patch
 	and motivation for this.
 
+	Allow adding IP address to nftables set in addition to
+	ipset.
+
 	
 version 2.85
         Fix problem with DNS retries in 2.83/2.84.

Makefile

@@ -1,4 +1,4 @@
-# dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+# dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -70,7 +70,9 @@ nettle_libs =   `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_DNSSEC     $(PKG_CO
                                                         HAVE_NETTLEHASH $(PKG_CONFIG) --libs nettle`
 gmp_libs =      `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_DNSSEC NO_GMP --copy -lgmp`
 sunos_libs =    `if uname | grep SunOS >/dev/null 2>&1; then echo -lsocket -lnsl -lposix4; fi`
-version =     -DVERSION='\"`$(top)/bld/get-version $(top)`\"'
+nft_cflags =    `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_NFTSET $(PKG_CONFIG) --cflags libnftables` 
+nft_libs =      `echo $(COPTS) | $(top)/bld/pkg-wrapper HAVE_NFTSET $(PKG_CONFIG) --libs libnftables`
+version =       -DVERSION='\"`$(top)/bld/get-version $(top)`\"'
 
 sum?=$(shell $(CC) -DDNSMASQ_COMPILE_OPTS $(COPTS) -E $(top)/$(SRC)/dnsmasq.h | ( md5sum 2>/dev/null || md5 ) | cut -f 1 -d ' ')
 sum!=$(CC) -DDNSMASQ_COMPILE_OPTS $(COPTS) -E $(top)/$(SRC)/dnsmasq.h | ( md5sum 2>/dev/null || md5 ) | cut -f 1 -d ' '
@@ -82,7 +84,7 @@ objs = cache.o rfc1035.o util.o option.o forward.o network.o \
        dhcp-common.o outpacket.o radv.o slaac.o auth.o ipset.o pattern.o \
        domain.o dnssec.o blockdata.o tables.o loop.o inotify.o \
        poll.o rrfilter.o edns0.o arp.o crypto.o dump.o ubus.o \
-       metrics.o hash-questions.o domain-match.o
+       metrics.o hash-questions.o domain-match.o nftset.o
 
 hdrs = dnsmasq.h config.h dhcp-protocol.h dhcp6-protocol.h \
        dns-protocol.h radv-protocol.h ip6addr.h metrics.h
@@ -90,8 +92,8 @@ hdrs = dnsmasq.h config.h dhcp-protocol.h dhcp6-protocol.h \
 all : $(BUILDDIR)
 	@cd $(BUILDDIR) && $(MAKE) \
  top="$(top)" \
- build_cflags="$(version) $(dbus_cflags) $(idn2_cflags) $(idn_cflags) $(ct_cflags) $(lua_cflags) $(nettle_cflags)" \
- build_libs="$(dbus_libs) $(idn2_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs) $(nettle_libs) $(gmp_libs) $(ubus_libs)" \
+ build_cflags="$(version) $(dbus_cflags) $(idn2_cflags) $(idn_cflags) $(ct_cflags) $(lua_cflags) $(nettle_cflags) $(nft_cflags)" \
+ build_libs="$(dbus_libs) $(idn2_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs) $(nettle_libs) $(gmp_libs) $(ubus_libs) $(nft_libs)" \
  -f $(top)/Makefile dnsmasq 
 
 mostly_clean :
@@ -115,8 +117,8 @@ all-i18n : $(BUILDDIR)
 	@cd $(BUILDDIR) && $(MAKE) \
  top="$(top)" \
  i18n=-DLOCALEDIR=\'\"$(LOCALEDIR)\"\' \
- build_cflags="$(version) $(dbus_cflags) $(idn2_cflags) $(idn_cflags) $(ct_cflags) $(lua_cflags) $(nettle_cflags)" \
- build_libs="$(dbus_libs) $(idn2_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs) $(nettle_libs) $(gmp_libs) $(ubus_libs)"  \
+ build_cflags="$(version) $(dbus_cflags) $(idn2_cflags) $(idn_cflags) $(ct_cflags) $(lua_cflags) $(nettle_cflags) $(nft_cflags)" \
+ build_libs="$(dbus_libs) $(idn2_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs) $(nettle_libs) $(gmp_libs) $(ubus_libs) $(nft_libs)"  \
  -f $(top)/Makefile dnsmasq
 	for f in `cd $(PO); echo *.po`; do \
 		cd $(top) && cd $(BUILDDIR) && $(MAKE) top="$(top)" -f $(top)/Makefile $${f%.po}.mo; \

contrib/Suse/README

@@ -1,6 +0,0 @@
-This packaging is now unmaintained in the dnsmasq source: dnsmasq is
-included in Suse proper, and up-to-date packages are now available
-from 
-
-ftp://ftp.suse.com/pub/people/ug/
-

contrib/Suse/README.susefirewall

@@ -1,27 +0,0 @@
-This is a patch against SuSEfirewall2-3.1-206 (SuSE 9.x and older)
-It fixes the dependency from the dns daemon name 'named'
-After appending the patch, the SuSEfirewall is again able to autodetect 
-the dnsmasq named service.
-This is a very old bug in the SuSEfirewall script.
-The SuSE people think the name of the dns server will always 'named'
-
-
---- /sbin/SuSEfirewall2.orig	2004-01-23 13:30:09.000000000 +0100
-+++ /sbin/SuSEfirewall2	2004-01-23 13:31:56.000000000 +0100
-@@ -764,7 +764,7 @@
-     echo 'FW_ALLOW_INCOMING_HIGHPORTS_UDP should be set to yes, if you are running a DNS server!'
- 
- test "$FW_SERVICE_AUTODETECT" = yes -o "$FW_SERVICE_AUTODETECT" = dmz -o "$FW_SERVICE_AUTODETECT" = ext && {
--    test "$FW_SERVICE_DNS" = no -a '!' "$START_NAMED" = no && check_srv named && {
-+    test "$FW_SERVICE_DNS" = no -a '!' "$START_NAMED" = no && check_srv dnsmasq && {
- 	echo -e 'Warning: detected activated named, enabling FW_SERVICE_DNS!
- You still have to allow tcp/udp port 53 on internal, dmz and/or external.'
- 	FW_SERVICE_DNS=$FW_SERVICE_AUTODETECT
-@@ -878,7 +878,7 @@
- test -e /etc/resolv.conf || echo "Warning: /etc/resolv.conf not found"
- # Get ports/IP bindings of NAMED/SQUID
- test "$FW_SERVICE_DNS" = yes -o "$FW_SERVICE_DNS" = dmz -o "$FW_SERVICE_DNS" = ext -o "$START_NAMED" = yes && DNS_PORT=`$LSOF -i -n -P | \
--    $AWK -F: '/^named .* UDP / {print $2}'| $GREP -vw 53 | $SORT -un`
-+    $AWK -F: '/^dnsmasq .* UDP / {print $2}'| $GREP -vw 53 | $SORT -un`
- test "$FW_SERVICE_SQUID" = yes -o "$FW_SERVICE_SQUID" = dmz -o "$FW_SERVICE_SQUID" = ext -o "$START_SQUID" = yes && SQUID_PORT=`$LSOF -i -n -P | \
-     $AWK -F: '/^squid .* UDP/ {print $2}'| $SORT -un`

contrib/Suse/dnsmasq-SuSE.patch

@@ -1,23 +0,0 @@
---- man/dnsmasq.8	2004-08-08 20:57:56.000000000 +0200
-+++ man/dnsmasq.8	2004-08-12 00:40:01.000000000 +0200
-@@ -69,7 +69,7 @@
- .TP
- .B \-g, --group=<groupname> 
- Specify the group which dnsmasq will run
--as. The defaults to "dip", if available, to facilitate access to
-+as. The defaults to "dialout", if available, to facilitate access to
- /etc/ppp/resolv.conf which is not normally world readable.
- .TP
- .B \-v, --version
---- src/config.h	2004-08-11 11:39:18.000000000 +0200
-+++ src/config.h	2004-08-12 00:40:01.000000000 +0200
-@@ -44,7 +44,7 @@
- #endif
- #define DEFLEASE 3600 /* default lease time, 1 hour */
- #define CHUSER "nobody"
--#define CHGRP "dip"
-+#define CHGRP "dialout"
- #define DHCP_SERVER_PORT 67
- #define DHCP_CLIENT_PORT 68
- 
-

contrib/Suse/dnsmasq-suse.spec

@@ -1,111 +0,0 @@
-###############################################################################
-#
-# General
-#
-###############################################################################
-
-Name: dnsmasq
-Version: 2.33
-Release: 1
-Copyright: GPL
-Group: Productivity/Networking/DNS/Servers
-Vendor: Simon Kelley
-Packager: Simon Kelley
-URL: http://www.thekelleys.org.uk/dnsmasq
-Provides: dns_daemon
-Conflicts: bind bind8 bind9
-PreReq: %fillup_prereq %insserv_prereq
-Autoreqprov: on
-Source0: %{name}-%{version}.tar.bz2
-BuildRoot: /var/tmp/%{name}-%{version}
-Summary: A lightweight caching nameserver
-
-%description
-Dnsmasq is lightweight, easy to configure DNS forwarder and DHCP server. It 
-is designed to provide DNS and, optionally, DHCP, to a small network. It can
-serve the names of local machines which are not in the global DNS. The DHCP 
-server integrates with the DNS server and allows machines with DHCP-allocated
-addresses to appear in the DNS with names configured either in each host or 
-in a central configuration file. Dnsmasq supports static and dynamic DHCP 
-leases and BOOTP for network booting of diskless machines.
-
-
-
-###############################################################################
-#
-# Build
-#
-###############################################################################
-
-%prep
-%setup -q
-patch -p0 <rpm/%{name}-SuSE.patch
-
-%build
-%{?suse_update_config:%{suse_update_config -f}}
-make all-i18n DESTDIR=$RPM_BUILD_ROOT PREFIX=/usr
-
-###############################################################################
-#
-# Install
-#
-###############################################################################
-
-%install
-rm -rf $RPM_BUILD_ROOT
-mkdir -p ${RPM_BUILD_ROOT}/etc/init.d
-make install-i18n DESTDIR=$RPM_BUILD_ROOT PREFIX=/usr
-install -o root -g root -m 755 rpm/rc.dnsmasq-suse $RPM_BUILD_ROOT/etc/init.d/dnsmasq
-install -o root -g root -m 644 dnsmasq.conf.example $RPM_BUILD_ROOT/etc/dnsmasq.conf
-strip $RPM_BUILD_ROOT/usr/sbin/dnsmasq
-ln -sf ../../etc/init.d/dnsmasq $RPM_BUILD_ROOT/usr/sbin/rcdnsmasq
-
-###############################################################################
-#
-# Clean up
-#
-###############################################################################
-
-%clean
-rm -rf $RPM_BUILD_ROOT
-
-###############################################################################
-#
-# Post-install scriptlet
-#
-###############################################################################
-
-%post
-%{fillup_and_insserv dnsmasq}
-
-###############################################################################
-#
-# Post-uninstall scriptlet
-#
-# The %postun script executes after the package has been removed. It is the
-# last chance for a package to clean up after itself.
-#
-###############################################################################
-
-%postun
-%{insserv_cleanup}
-
-###############################################################################
-#
-# File list
-#
-###############################################################################
-
-%files
-%defattr(-,root,root)
-%doc CHANGELOG COPYING FAQ doc.html setup.html UPGRADING_to_2.0 rpm/README.susefirewall
-%doc contrib
-%config /etc/init.d/dnsmasq
-%config /etc/dnsmasq.conf
-/usr/sbin/rcdnsmasq
-/usr/sbin/dnsmasq
-/usr/share/locale/*/LC_MESSAGES/*
-%doc %{_mandir}/man8/dnsmasq.8.gz
-%doc %{_mandir}/*/man8/dnsmasq.8.gz
-
-

contrib/Suse/rc.dnsmasq-suse

@@ -1,79 +0,0 @@
-#! /bin/sh
-#
-# init.d/dnsmasq
-#
-### BEGIN INIT INFO
-# Provides:       dnsmasq
-# Required-Start: $network $remote_fs $syslog
-# Required-Stop:
-# Default-Start:  3 5
-# Default-Stop:
-# Description:    Starts internet name service masq caching server (DNS)
-### END INIT INFO
-
-NAMED_BIN=/usr/sbin/dnsmasq
-NAMED_PID=/var/run/dnsmasq.pid
-NAMED_CONF=/etc/dnsmasq.conf
-
-if [ ! -x $NAMED_BIN ] ; then
-	echo -n "dnsmasq not installed ! "
-	exit 5
-fi
-
-. /etc/rc.status
-rc_reset
-
-case "$1" in
-    start)
-	echo -n "Starting name service masq caching server "
-        checkproc -p $NAMED_PID $NAMED_BIN
-        if [ $? -eq 0 ] ; then
-           echo -n "- Warning: dnsmasq already running ! "
-        else
-           [ -e $NAMED_PID ] && echo -n "- Warning: $NAMED_PID exists ! "
-	fi
-	startproc -p $NAMED_PID $NAMED_BIN -u nobody
-	rc_status -v
-	;;
-    stop)
-	echo -n "Shutting name service masq caching server "
-	checkproc -p $NAMED_PID $NAMED_BIN
-	[ $? -ne 0 ] && echo -n "- Warning: dnsmasq not running ! "
-	killproc -p $NAMED_PID -TERM $NAMED_BIN
-	rc_status -v
-	;;
-    try-restart)
-	$0 stop  &&  $0 start
-	rc_status
-	;;
-    restart)
-	$0 stop
-	$0 start
-	rc_status
-	;;
-    force-reload)
-	$0 reload
-	rc_status
-	;;
-    reload)
-	echo -n "Reloading name service masq caching server "
-	checkproc -p $NAMED_PID $NAMED_BIN
-	[ $? -ne 0 ] && echo -n "- Warning: dnsmasq not running ! "
-	killproc -p $NAMED_PID -HUP $NAMED_BIN
-	rc_status -v
-	;;
-    status)
-	echo -n "Checking for name service masq caching server "
-	checkproc -p $NAMED_PID $NAMED_BIN
-	rc_status -v
-	;;
-    probe)
-	test $NAMED_CONF -nt $NAMED_PID && echo reload
-	;;
-    *)
-	echo "Usage: $0 {start|stop|status|try-restart|restart|force-reload|reload|probe}"
-	exit 1
-	;;
-esac
-rc_exit
-

contrib/lease-tools/dhcp_release.c

@@ -280,6 +280,7 @@ int main(int argc, char **argv)
   
   /* This voodoo fakes up a packet coming from the correct interface, which really matters for 
      a DHCP server */
+  memset(&ifr, 0, sizeof(ifr));
   strncpy(ifr.ifr_name, argv[1], sizeof(ifr.ifr_name)-1);
   ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';
   if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) == -1)

contrib/lease-tools/dhcp_release6.c

@@ -318,6 +318,12 @@ void usage(const char* arg, FILE* stream)
   fprintf (stream, "Usage: %s %s\n", arg, usage_string);   
 }
 
+static void fail_fatal(const char *errstr, int exitcode)
+{
+  perror(errstr);
+  exit(exitcode);
+}
+
 int send_release_packet(const char* iface, struct dhcp6_packet* packet)
 {
   struct sockaddr_in6 server_addr, client_addr;
@@ -343,18 +349,19 @@ int send_release_packet(const char* iface, struct dhcp6_packet* packet)
     client_addr.sin6_port = htons(DHCP6_CLIENT_PORT);
     client_addr.sin6_flowinfo = 0;
     client_addr.sin6_scope_id =0;
-    inet_pton(AF_INET6, "::", &client_addr.sin6_addr);
-    bind(sock, (struct sockaddr*)&client_addr, sizeof(struct sockaddr_in6));
-    inet_pton(AF_INET6, DHCP6_MULTICAST_ADDRESS, &server_addr.sin6_addr);
+    if (inet_pton(AF_INET6, "::", &client_addr.sin6_addr) <= 0)
+      fail_fatal("inet_pton", 5);
+    if (bind(sock, (struct sockaddr*)&client_addr, sizeof(struct sockaddr_in6)) != 0)
+      perror("bind"); /* continue on bind error */
+    if (inet_pton(AF_INET6, DHCP6_MULTICAST_ADDRESS, &server_addr.sin6_addr) <= 0)
+      fail_fatal("inet_pton", 5);
     server_addr.sin6_port = htons(DHCP6_SERVER_PORT);
-    int16_t recv_size = 0;
+    ssize_t recv_size = 0;
+    int result;
     for (i = 0; i < 5; i++)
       {
         if (sendto(sock, packet->buf, packet->len, 0, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
-	  {
-	    perror("sendto failed");
-            exit(4);
-	  }
+	  fail_fatal("sendto failed", 4);
 	
         recv_size = recvfrom(sock, response, sizeof(response), MSG_DONTWAIT, NULL, 0);
         if (recv_size == -1)
@@ -367,16 +374,18 @@ int send_release_packet(const char* iface, struct dhcp6_packet* packet)
 	    else
 	      {
                 perror("recvfrom");
+		result = UNSPEC_FAIL;
 	      }
 	  }
-	
-        int16_t result = parse_packet(response, recv_size);
-        if (result == NOT_REPLY_CODE)
+	else
 	  {
-            sleep(1);
-            continue;
+	    result = parse_packet(response, recv_size);
+	    if (result == NOT_REPLY_CODE)
+	      {
+		sleep(1);
+		continue;
+	      }
 	  }
-
         close(sock);
         return result;
       }

dbus/DBus-interface

@@ -48,6 +48,10 @@ SetBogusPrivOption
 ------------------
 Takes boolean, sets or resets the --bogus-priv option.
 
+SetLocaliseQueriesOption
+------------------------
+Takes boolean, sets or resets the --localise-queries option.
+
 SetServers
 ----------
 Returns nothing. Takes a set of arguments representing the new

debian/changelog

@@ -1,3 +1,20 @@
+dnsmasq (2.87-1) unstable; urgency=low
+
+   * New upstream. (closes: #1001209, #1003156)
+   * Include new NFTset support in the build.
+   * Fix crash on netboot with DNS server disabled. (closes: #996332)
+   * Fix rare lockup in DNSSEC. (closes: #1001576)
+   * Close old bug. (closes: #902963)
+
+ -- Simon Kelley <simon@thekelleys.org.uk>  Wed, 08 Sep 2021 23:11:25 +0000
+
+dnsmasq (2.86-1.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix --address=/#/...... which was lost in 2.86. (closes: #995655)
+
+ -- Michael Biebl <biebl@debian.org>  Wed, 10 Nov 2021 22:05:45 +0100
+
 dnsmasq (2.86-1) unstable; urgency=low
 
    * Fix debian/changelog format error. (closes: #986626)

debian/control

@@ -5,7 +5,7 @@ Build-depends: gettext, libnetfilter-conntrack-dev [linux-any],
                libidn2-dev, libdbus-1-dev (>=0.61), libgmp-dev, 
                nettle-dev (>=2.4-3), libbsd-dev [kfreebsd-any],
 	       liblua5.2-dev, dh-runit, debhelper-compat (= 10),
-               pkg-config
+               pkg-config, libnftables-dev
 Maintainer: Simon Kelley <simon@thekelleys.org.uk>
 Homepage: http://www.thekelleys.org.uk/dnsmasq/doc.html
 Vcs-Git: http://thekelleys.org.uk/git/dnsmasq.git

debian/readme

@@ -60,6 +60,7 @@ Notes on configuring dnsmasq as packaged for Debian.
       nodbus      : omit DBus support.
       noconntrack : omit connection tracking support. 
       noipset     : omit IPset support.
+      nonftset    : omit nftset support.
       nortc       : compile alternate mode suitable for systems without an RTC.
       noi18n      : omit translations and internationalisation support.
       noidn       : omit international domain name support, must be

debian/rules

@@ -52,6 +52,10 @@ ifeq (,$(filter noidn, $(DEB_BUILD_OPTIONS)))
 	DEB_COPTS += -DHAVE_LIBIDN2
 endif
 
+ifeq (,$(filter nonftset, $(DEB_BUILD_OPTIONS)))
+	DEB_COPTS += -DHAVE_NFTSET
+endif
+
 ifeq (,$(filter noconntrack,$(DEB_BUILD_OPTIONS)))
 ifeq ($(DEB_HOST_ARCH_OS),linux)
      DEB_COPTS += -DHAVE_CONNTRACK

dnsmasq.conf.example

@@ -85,6 +85,16 @@
 # subdomains to the vpn and search ipsets:
 #ipset=/yahoo.com/google.com/vpn,search
 
+# Add the IPs of all queries to yahoo.com, google.com, and their
+# subdomains to netfilters sets, which is equivalent to
+# 'nft add element ip test vpn { ... }; nft add element ip test search { ... }'
+#nftset=/yahoo.com/google.com/ip#test#vpn,ip#test#search
+
+# Use netfilters sets for both IPv4 and IPv6:
+# This adds all addresses in *.yahoo.com to vpn4 and vpn6 for IPv4 and IPv6 addresses.
+#nftset=/yahoo.com/4#ip#test#vpn4
+#nftset=/yahoo.com/6#ip#test#vpn6
+
 # You can control how dnsmasq talks to a server: this forces
 # queries to 10.1.2.3 to be routed via eth1
 # server=10.1.2.3@eth1

man/dnsmasq.8

@@ -345,8 +345,15 @@ forged answer to a DNS request for certain domain, before the correct answer can
 .B \-f, --filterwin2k
 Later versions of windows make periodic DNS requests which don't get sensible answers from
 the public DNS and can cause problems by triggering dial-on-demand links. This flag turns on an option
-to filter such requests. The requests blocked are for records of types SOA and SRV, and type ANY where the 
-requested name has underscores, to catch LDAP requests.
+to filter such requests. The requests blocked are for records of type ANY
+where the requested name has underscores, to catch LDAP requests, and for
+\fBall\fP records of types SOA and SRV.
+.TP
+.B --filter-A
+Remove A records from answers. No IPv4 addresses will be returned.
+.TP
+.B --filter-AAAA
+Remove AAAA records from answers. No IPv6 addresses will be returned.
 .TP
 .B \-r, --resolv-file=<file>
 Read the IP addresses of the upstream nameservers from <file>, instead of
@@ -505,21 +512,20 @@ source address specified but the port may be specified directly as
 part of the source address. Forcing queries to an interface is not
 implemented on all platforms supported by dnsmasq.
 .TP
-.B --rev-server=<ip-address>/<prefix-len>[,<ipaddr>][#<port>][@<interface>][@<source-ip>[#<port>]]
+.B --rev-server=<ip-address>[/<prefix-len>][,<ipaddr>][#<port>][@<interface>][@<source-ip>[#<port>]]
 This is functionally the same as 
 .B --server, 
 but provides some syntactic sugar to make specifying address-to-name queries easier. For example
 .B --rev-server=1.2.3.0/24,192.168.0.1
 is exactly equivalent to 
 .B --server=/3.2.1.in-addr.arpa/192.168.0.1
+Allowed prefix lengths are 1-32 (IPv4) and 1-128 (IPv6). If the prefix length is omitted, dnsmasq substitutes either 32 (IPv4) or 128 (IPv6).
 .TP
 .B \-A, --address=/<domain>[/<domain>...]/[<ipaddr>]
 Specify an IP address to return for any host in the given domains.
-Queries in the domains are never forwarded and always replied to
+A (or AAAA) queries in the domains are never forwarded and always replied to
 with the specified IP address which may be IPv4 or IPv6. To give
-both IPv4 and IPv6 addresses for a domain, use repeated \fB--address\fP flags.
-To include multiple IP addresses for a single query, use
-\fB--addn-hosts=<path>\fP instead.
+multiple addresses or both IPv4 and IPv6 addresses for a domain, use repeated \fB--address\fP flags.
 Note that /etc/hosts and DHCP leases override this for individual
 names. A common use of this is to redirect the entire doubleclick.net
 domain to some friendly local web server to avoid banner ads. The
@@ -537,6 +543,11 @@ address of 0.0.0.0 and its IPv6 equivalent of :: so
 its subdomains. This is partly syntactic sugar for \fB--address=/example.com/0.0.0.0\fP
 and \fB--address=/example.com/::\fP but is also more efficient than including both
 as separate configuration lines. Note that NULL addresses normally work in the same way as localhost, so beware that clients looking up these names are likely to end up talking to themselves.
+
+Note that the behaviour for queries which don't match the specified address literal changed in version 2.86.
+Previous versions, configured with (eg) --address=/example.com/1.2.3.4 and then queried for a RR type other than
+A would return a NoData answer. From  2.86, the query is sent upstream. To restore the pre-2.86 behaviour,
+use the configuration --address=/example.com/1.2.3.4 --local=/example.com/
 .TP
 .B --ipset=/<domain>[/<domain>...]/<ipset>[,<ipset>...]
 Places the resolved IP addresses of queries for one or more domains in
@@ -549,6 +560,15 @@ These IP sets must already exist. See
 .BR ipset (8)
 for more details.
 .TP
+.B --nftset=/<domain>[/<domain>...]/[(6|4)#[<family>#]<table>#<set>[,[(6|4)#[<family>#]<table>#<set>]...]
+Similar to the \fB--ipset\fP option, but accepts one or more nftables 
+sets to add IP addresses into.
+These sets must already exist. See
+.BR nft (8)
+for more details. The family, table and set are passed directly to the nft. If the spec starts with 4# or 6# then
+only A or AAAA records respectively are added to the set. Since an nftset can hold only IPv4 or IPv6 addresses, this
+avoids errors being logged for addresses of the wrong type.
+.TP
 .B --connmark-allowlist-enable[=<mask>]
 Enables filtering of incoming DNS queries with associated Linux connection track marks
 according to individual allowlists configured via a series of \fB--connmark-allowlist\fP
@@ -714,7 +734,7 @@ Specify the location of a pcap-format file which dnsmasq uses to dump copies of
 .TP
 .B --dumpmask=<mask>
 Specify which types of packets should be added to the dumpfile. The argument should be the OR of the bitmasks for each type of packet to be dumped: it can be specified in hex by preceding the number with 0x in  the normal way. Each time a packet is written to the dumpfile, dnsmasq logs the packet sequence and the mask
-representing its type. The current types are: 0x0001 - DNS queries from clients 0x0002 DNS replies to clients 0x0004 - DNS queries to upstream 0x0008 - DNS replies from upstream 0x0010 - queries send upstream for DNSSEC validation 0x0020 - replies to queries for DNSSEC validation 0x0040 - replies to client queries which fail DNSSEC validation 0x0080 replies to queries for DNSSEC validation which fail validation.
+representing its type. The current types are: 0x0001 - DNS queries from clients, 0x0002 DNS replies to clients, 0x0004 - DNS queries to upstream, 0x0008 - DNS replies from upstream, 0x0010 - queries send upstream for DNSSEC validation, 0x0020 - replies to queries for DNSSEC validation, 0x0040 - replies to client queries which fail DNSSEC validation, 0x0080 replies to queries for DNSSEC validation which fail validation, 0x1000 - DHCPv4, 0x2000 - DHCPv6, 0x4000 - Router advertisement, 0x8000 - TFTP.
 .TP
 .B --add-mac[=base64|text]
 Add the MAC address of the requestor to DNS queries which are
@@ -727,6 +747,9 @@ have security and privacy implications. The warning about caching
 given for \fB--add-subnet\fP applies to \fB--add-mac\fP too. An alternative encoding of the
 MAC, as base64, is enabled by adding the "base64" parameter and a human-readable encoding of hex-and-colons is enabled by added the "text" parameter.
 .TP
+.B --strip-mac
+Remove any MAC address information already in downstream queries before forwarding upstream.  
+.TP
 .B --add-cpe-id=<string>
 Add an arbitrary identifying string to DNS queries which are
 forwarded upstream.
@@ -752,12 +775,18 @@ will add 1.2.3.0/24 for IPv4 requestors and ::/0 for IPv6 requestors.
 .B --add-subnet=1.2.3.4/24,1.2.3.4/24
 will add 1.2.3.0/24 for both IPv4 and IPv6 requestors.
 .TP
-.B --umbrella[=deviceid:<deviceid>[,orgid:<orgid>]]
+.B --strip-subnet
+Remove any subnet address already present in a downstream query before forwarding it upstream. If --add-subnet is set this also
+ensures that any downstream-provided subnet is replaced by the one added by dnsmasq. Otherwise, dnsmasq will NOT replace an
+existing subnet in the query.
+.TP
+.B --umbrella[=[deviceid:<deviceid>][,orgid:<orgid>][,assetid:<id>]]
 Embeds the requestor's IP address in DNS queries forwarded upstream.
-If device id or organization id are specified, the information is
+If device id or, asset id or organization id are specified, the information is
 included in the forwarded queries and may be able to be used in
-filtering policies and reporting. The order of the deviceid and orgid
-attributes is irrelevant, but must be separated by a comma.
+filtering policies and reporting. The order of the id
+attributes is irrelevant, but they must be separated by a comma. Deviceid is
+a sixteen digit hexadecimal number, org and asset ids are decimal numbers.
 .TP
 .B \-c, --cache-size=<cachesize>
 Set the size of dnsmasq's cache. The default is 150 names. Setting the cache size to zero disables caching. Note: huge cache size impacts performance.
@@ -1036,7 +1065,7 @@ is also included, as described in RFC-3775 section 7.3.
 tells dnsmasq to advertise the prefix without the on-link (aka L) bit set.
 
 .TP
-.B \-G, --dhcp-host=[<hwaddr>][,id:<client_id>|*][,set:<tag>][tag:<tag>][,<ipaddr>][,<hostname>][,<lease_time>][,ignore]
+.B \-G, --dhcp-host=[<hwaddr>][,id:<client_id>|*][,set:<tag>][,tag:<tag>][,<ipaddr>][,<hostname>][,<lease_time>][,ignore]
 Specify per host parameters for the DHCP server. This allows a machine
 with a particular hardware address to be always allocated the same
 hostname, IP address and lease time. A hostname specified like this
@@ -1135,7 +1164,10 @@ ignore requests from unknown machines using
 If the host matches only a \fB--dhcp-host\fP directive which cannot
 be used because it specifies an address on different subnet, the tag "known-othernet" is set.
 
-The tag:<tag> construct filters which dhcp-host directives are used. Tagged directives are used in preference to untagged ones.
+The tag:<tag> construct filters which dhcp-host directives are used; more than
+one can be provided, in this case the request must match all of them. Tagged
+directives are used in preference to untagged ones. Note that one of <hwaddr>,
+<client_id> or <hostname> still needs to be specified (can be a wildcard).
 
 Ethernet addresses (but not client-ids) may have
 wildcard bytes, so for example 
@@ -1309,7 +1341,7 @@ DHCP options. This make extra space available in the DHCP packet for
 options but can, rarely, confuse old or broken clients. This flag
 forces "simple and safe" behaviour to avoid problems in such a case.
 .TP
-.B --dhcp-relay=<local address>,<server address>[,<interface]
+.B --dhcp-relay=<local address>[,<server address>][,<interface]
 Configure dnsmasq to do DHCP relay. The local address is an address
 allocated to an interface on the host running dnsmasq. All DHCP
 requests arriving on that interface will we relayed to a remote DHCP
@@ -1317,10 +1349,9 @@ server at the server address. It is possible to relay from a single local
 address to multiple remote servers by using multiple \fB--dhcp-relay\fP
 configs with the same local address and different server
 addresses. A server address must be an IP literal address, not a
-domain name. In the case of DHCPv6, the server address may be the
-ALL_SERVERS multicast address, ff05::1:3. In this case the interface
-must be given, not be wildcard, and is used to direct the multicast to the
-correct interface to reach the DHCP server. 
+domain name. If the server address is ommitted, the request will be
+forwarded by broadcast (IPv4) or multicast (IPv6). In this case the interface
+must be given and not be wildcard.
 
 Access control for DHCP clients has the same rules as for the DHCP
 server, see \fB--interface\fP, \fB--except-interface\fP, etc. The optional
@@ -1340,6 +1371,11 @@ supported: the relay function will take precedence.
 
 Both DHCPv4 and DHCPv6 relay is supported. It's not possible to relay
 DHCPv4 to a DHCPv6 server or vice-versa.
+
+The DHCP relay function for IPv6 includes the ability to snoop
+prefix-delegation from relayed DHCP transactions. See
+.B --dhcp-script
+for details. 
 .TP
 .B \-U, --dhcp-vendorclass=set:<tag>,[enterprise:<IANA-enterprise number>,]<vendor-class>
 Map from a vendor-class string to a tag. Most DHCP clients provide a 
@@ -1750,15 +1786,25 @@ receives a HUP signal, the script will be invoked for existing leases
 with an "old" event.
 
 
-There are four further actions which may appear as the first argument
-to the script, "init", "arp-add", "arp-del" and "tftp". More may be added in the future, so
+There are five further actions which may appear as the first argument
+to the script, "init", "arp-add", "arp-del", "relay-snoop" and "tftp".
+More may be added in the future, so
 scripts should be written to ignore unknown actions. "init" is
 described below in 
 .B --leasefile-ro
+
 The "tftp" action is invoked when a TFTP file transfer completes: the
 arguments are the file size in bytes, the address to which the file
 was sent, and the complete pathname of the file.
- 
+
+The "relay-snoop" action is invoked when dnsmasq is configured as a DHCP
+relay for DHCPv6 and it relays a prefx delegation to a client. The arguments
+are the name of the interface where the client is conected, its (link-local)
+address on that interface and the delegated prefix. This information is
+sufficient to install routes to the delegated prefix of a router. See
+.B --dhcp-relay
+for more details on configuring DHCP relay.
+
 The "arp-add" and "arp-del" actions are only called if enabled with
 .B --script-arp
 They are are supplied with a MAC address and IP address as arguments. "arp-add" indicates
@@ -1923,7 +1969,6 @@ additional flag "local" may be supplied which has the effect of adding
 is identical to
 .B --domain=thekelleys.org.uk,192.168.0.0/24
 .B --local=/thekelleys.org.uk/ --local=/0.168.192.in-addr.arpa/
-The network size must be 8, 16 or 24 for this to be legal.
 .TP
 .B --dhcp-fqdn
 In the default mode, dnsmasq inserts the unqualified names of
@@ -2096,6 +2141,23 @@ A special case of
 which differs in two respects. Firstly, only \fB--server\fP and \fB--rev-server\fP are allowed
 in the configuration file included. Secondly, the file is re-read and the configuration
 therein is updated when dnsmasq receives SIGHUP.
+.TP
+.B \--conf-script=<file>[ <arg]
+Execute <file>, and treat what it emits to stdout as the contents of a configuration file.
+If the script exits with a non-zero exit code, dnsmasq treats this as a fatal error.
+The script can be passed arguments, space seperated from the filename and each other so, for instance
+.B --conf-dir="/etc/dnsmasq-uncompress-ads /share/ads-domains.gz"
+
+with /etc/dnsmasq-uncompress-ads containing 
+
+set -e
+
+zcat ${1} | sed -e "s:^:address=/:" -e "s:$:/:" 
+
+exit 0
+
+and /share/ads-domains.gz containing a compressed
+list of ad server domains will save disk space with large ad-server blocklists.
 .SH CONFIG FILE
 At startup, dnsmasq reads
 .I /etc/dnsmasq.conf,
@@ -2492,7 +2554,9 @@ file/directory, permissions).
 5 - Other miscellaneous problem.
 .PP
 11 or greater - a non zero return code was received from the
-lease-script process "init" call. The exit code from dnsmasq is the
+lease-script process "init" call or a
+.B \--conf-script
+file. The exit code from dnsmasq is the
 script's exit code with 10 added. 
 
 .SH LIMITS

po/de.po

@@ -2145,8 +2145,8 @@ msgstr "nicht unterstützte Anfrage von %s"
 
 #: tftp.c:512
 #, c-format
-msgid "file %s not found"
-msgstr "Datei %s nicht gefunden"
+msgid "file %s not found for %s"
+msgstr "Datei %s nicht gefunden für %s"
 
 #: tftp.c:602
 #, c-format

po/es.po

@@ -2213,8 +2213,8 @@ msgstr "pedido no-soportado desde %s"
 
 #: tftp.c:512
 #, fuzzy, c-format
-msgid "file %s not found"
-msgstr "archivo %s no encontrado"
+msgid "file %s not found for %s"
+msgstr "archivo %s no encontrado por %s"
 
 #: tftp.c:602
 #, c-format

po/fi.po

@@ -2114,7 +2114,7 @@ msgstr ""
 
 #: tftp.c:512
 #, c-format
-msgid "file %s not found"
+msgid "file %s not found for %s"
 msgstr ""
 
 #: tftp.c:602

po/fr.po

@@ -2197,8 +2197,8 @@ msgstr "requ
 
 #: tftp.c:512
 #, c-format
-msgid "file %s not found"
-msgstr "fichier %s non trouvé"
+msgid "file %s not found for %s"
+msgstr "fichier %s non trouvé pour %s"
 
 #: tftp.c:602
 #, c-format

po/id.po

@@ -2460,8 +2460,8 @@ msgstr ""
 # OK
 #: tftp.c:512
 #, fuzzy, c-format
-msgid "file %s not found"
-msgstr "lease tak ditemukan"
+msgid "file %s not found for %s"
+msgstr "file %s tidak ditemukan untuk %s"
 
 #: tftp.c:602
 #, c-format

po/it.po

@@ -2114,7 +2114,7 @@ msgstr ""
 
 #: tftp.c:512
 #, c-format
-msgid "file %s not found"
+msgid "file %s not found for %s"
 msgstr ""
 
 #: tftp.c:602

po/no.po

@@ -2194,8 +2194,8 @@ msgstr ""
 
 #: tftp.c:512
 #, fuzzy, c-format
-msgid "file %s not found"
-msgstr "leie ikke funnet"
+msgid "file %s not found for %s"
+msgstr "fil %s ikke funnet for %s"
 
 #: tftp.c:602
 #, c-format

po/pl.po

@@ -2149,8 +2149,8 @@ msgstr "nieobsługiwane żądanie od komputera %s"
 
 #: tftp.c:512
 #, c-format
-msgid "file %s not found"
-msgstr "plik %s nie został znaleziony"
+msgid "file %s not found for %s"
+msgstr "plik %s nie został znaleziony dla %s"
 
 #: tftp.c:602
 #, c-format

po/pt_BR.po

@@ -2114,7 +2114,7 @@ msgstr ""
 
 #: tftp.c:512
 #, c-format
-msgid "file %s not found"
+msgid "file %s not found for %s"
 msgstr ""
 
 #: tftp.c:602

po/ro.po

@@ -2195,8 +2195,8 @@ msgstr ""
 
 #: tftp.c:512
 #, fuzzy, c-format
-msgid "file %s not found"
-msgstr "împrumutul nu a fost găsit"
+msgid "file %s not found for %s"
+msgstr "fișier %s nu a fost găsit pentru %s"
 
 #: tftp.c:602
 #, c-format

src/arp.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/auth.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -210,7 +210,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	      if (local_query || in_zone(zone, intr->name, NULL))
 		{	
 		  found = 1;
-		  log_query(flag | F_REVERSE | F_CONFIG, intr->name, &addr, NULL);
+		  log_query(flag | F_REVERSE | F_CONFIG, intr->name, &addr, NULL, 0);
 		  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					  daemon->auth_ttl, NULL,
 					  T_PTR, C_IN, "d", intr->name))
@@ -234,7 +234,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		      strcat(name, ".");
 		      strcat(name, zone->domain);
 		    }
-		  log_query(flag | F_DHCP | F_REVERSE, name, &addr, record_source(crecp->uid));
+		  log_query(flag | F_DHCP | F_REVERSE, name, &addr, record_source(crecp->uid), 0);
 		  found = 1;
 		  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					  daemon->auth_ttl, NULL,
@@ -243,7 +243,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		}
 	      else if (crecp->flags & (F_DHCP | F_HOSTS) && (local_query || in_zone(zone, name, NULL)))
 		{
-		  log_query(crecp->flags & ~F_FORWARD, name, &addr, record_source(crecp->uid));
+		  log_query(crecp->flags & ~F_FORWARD, name, &addr, record_source(crecp->uid), 0);
 		  found = 1;
 		  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					  daemon->auth_ttl, NULL,
@@ -257,7 +257,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 
 	  if (!found && is_rev_synth(flag, &addr, name) && (local_query || in_zone(zone, name, NULL)))
 	    {
-	      log_query(F_CONFIG | F_REVERSE | flag, name, &addr, NULL); 
+	      log_query(F_CONFIG | F_REVERSE | flag, name, &addr, NULL, 0);
 	      found = 1;
 	      
 	      if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
@@ -269,7 +269,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	  if (found)
 	    nxdomain = 0;
 	  else
-	    log_query(flag | F_NEG | F_NXDOMAIN | F_REVERSE | (auth ? F_AUTH : 0), NULL, &addr, NULL);
+	    log_query(flag | F_NEG | F_NXDOMAIN | F_REVERSE | (auth ? F_AUTH : 0), NULL, &addr, NULL, 0);
 
 	  continue;
 	}
@@ -300,7 +300,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	    if (rc == 2 && qtype == T_MX)
 	      {
 		found = 1;
-		log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>"); 
+		log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>", 0);
 		if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->auth_ttl,
 					NULL, T_MX, C_IN, "sd", rec->weight, rec->target))
 		  anscount++;
@@ -315,7 +315,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	    if (rc == 2 && qtype == T_SRV)
 	      {
 		found = 1;
-		log_query(F_CONFIG | F_RRNAME, name, NULL, "<SRV>"); 
+		log_query(F_CONFIG | F_RRNAME, name, NULL, "<SRV>", 0);
 		if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->auth_ttl,
 					NULL, T_SRV, C_IN, "sssd", 
 					rec->priority, rec->weight, rec->srvport, rec->target))
@@ -349,7 +349,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	    if (rc == 2 && txt->class == qtype)
 	      {
 		found = 1;
-		log_query(F_CONFIG | F_RRNAME, name, NULL, querystr(NULL, txt->class)); 
+		log_query(F_CONFIG | F_RRNAME, name, NULL, NULL, txt->class);
 		if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->auth_ttl,
 					NULL, txt->class, C_IN, "t", txt->len, txt->txt))
 		  anscount++;
@@ -363,7 +363,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	    if (rc == 2 && qtype == T_TXT)
 	      {
 		found = 1;
-		log_query(F_CONFIG | F_RRNAME, name, NULL, "<TXT>"); 
+		log_query(F_CONFIG | F_RRNAME, name, NULL, "<TXT>", 0);
 		if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->auth_ttl,
 					NULL, T_TXT, C_IN, "t", txt->len, txt->txt))
 		  anscount++;
@@ -377,7 +377,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	     if (rc == 2 && qtype == T_NAPTR)
 	       {
 		 found = 1;
-		 log_query(F_CONFIG | F_RRNAME, name, NULL, "<NAPTR>");
+		 log_query(F_CONFIG | F_RRNAME, name, NULL, "<NAPTR>", 0);
 		 if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->auth_ttl, 
 					 NULL, T_NAPTR, C_IN, "sszzzd", 
 					 na->order, na->pref, na->flags, na->services, na->regexp, na->replace))
@@ -407,7 +407,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		       continue;
 
 		     found = 1;
-		     log_query(F_FORWARD | F_CONFIG | flag, name, &addrlist->addr, NULL);
+		     log_query(F_FORWARD | F_CONFIG | flag, name, &addrlist->addr, NULL, 0);
 		     if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					     daemon->auth_ttl, NULL, qtype, C_IN, 
 					     qtype == T_A ? "4" : "6", &addrlist->addr))
@@ -417,10 +417,9 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 
        if (!found && is_name_synthetic(flag, name, &addr) )
 	 {
-	   found = 1;
 	   nxdomain = 0;
 	   
-	   log_query(F_FORWARD | F_CONFIG | flag, name, &addr, NULL);
+	   log_query(F_FORWARD | F_CONFIG | flag, name, &addr, NULL, 0);
 	   if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 				   daemon->auth_ttl, NULL, qtype, C_IN, qtype == T_A ? "4" : "6", &addr))
 	     anscount++;
@@ -433,8 +432,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	  if (qtype == T_SOA)
 	    {
 	      auth = soa = 1; /* inhibits auth section */
-	      found = 1;
-	      log_query(F_RRNAME | F_AUTH, zone->domain, NULL, "<SOA>");
+	      log_query(F_RRNAME | F_AUTH, zone->domain, NULL, "<SOA>", 0);
 	    }
       	  else if (qtype == T_AXFR)
 	    {
@@ -469,16 +467,14 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	      soa = 1; /* inhibits auth section */
 	      ns = 1; /* ensure we include NS records! */
 	      axfr = 1;
-	      found = 1;
 	      axfroffset = nameoffset;
-	      log_query(F_RRNAME | F_AUTH, zone->domain, NULL, "<AXFR>");
+	      log_query(F_RRNAME | F_AUTH, zone->domain, NULL, "<AXFR>", 0);
 	    }
       	  else if (qtype == T_NS)
 	    {
 	      auth = 1;
 	      ns = 1; /* inhibits auth section */
-	      found = 1;
-	      log_query(F_RRNAME | F_AUTH, zone->domain, NULL, "<NS>"); 
+	      log_query(F_RRNAME | F_AUTH, zone->domain, NULL, "<NS>", 0);
 	    }
 	}
       
@@ -496,9 +492,8 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 			(local_query || filter_zone(zone, flag, &(crecp->addr))))
 		      {
 			*cut = '.'; /* restore domain part */
-			log_query(crecp->flags, name, &crecp->addr, record_source(crecp->uid));
+			log_query(crecp->flags, name, &crecp->addr, record_source(crecp->uid), 0);
 			*cut  = 0; /* remove domain part */
-			found = 1;
 			if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 						daemon->auth_ttl, NULL, qtype, C_IN, 
 						qtype == T_A ? "4" : "6", &crecp->addr))
@@ -518,8 +513,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		 nxdomain = 0;
 		 if ((crecp->flags & flag) && (local_query || filter_zone(zone, flag, &(crecp->addr))))
 		   {
-		     log_query(crecp->flags, name, &crecp->addr, record_source(crecp->uid));
-		     found = 1;
+		     log_query(crecp->flags, name, &crecp->addr, record_source(crecp->uid), 0);
 		     if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					     daemon->auth_ttl, NULL, qtype, C_IN, 
 					     qtype == T_A ? "4" : "6", &crecp->addr))
@@ -566,7 +560,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	  
 	  if (candidate)
 	    {
-	      log_query(F_CONFIG | F_CNAME, name, NULL, NULL);
+	      log_query(F_CONFIG | F_CNAME, name, NULL, NULL, 0);
 	      strcpy(name, candidate->target);
 	      if (!strchr(name, '.'))
 		{
@@ -584,7 +578,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	  else if (cache_find_non_terminal(name, now))
 	    nxdomain = 0;
 
-	  log_query(flag | F_NEG | (nxdomain ? F_NXDOMAIN : 0) | F_FORWARD | F_AUTH, name, NULL, NULL);
+	  log_query(flag | F_NEG | (nxdomain ? F_NXDOMAIN : 0) | F_FORWARD | F_AUTH, name, NULL, NULL, 0);
 	}
       
     }
@@ -614,7 +608,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 	      if (subnet->prefixlen >= 16 )
 		p += sprintf(p, "%u.", a & 0xff);
 	      a = a >> 8;
-	      p += sprintf(p, "%u.in-addr.arpa", a & 0xff);
+	      sprintf(p, "%u.in-addr.arpa", a & 0xff);
 	      
 	    }
 	  else
@@ -627,7 +621,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
 		  int dig = ((unsigned char *)&subnet->addr.addr6)[i>>3];
 		  p += sprintf(p, "%.1x.", (i>>2) & 1 ? dig & 15 : dig >> 4);
 		}
-	      p += sprintf(p, "ip6.arpa");
+	      sprintf(p, "ip6.arpa");
 	      
 	    }
 	}
@@ -892,7 +886,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
       header->nscount = htons(0);
       addr.log.rcode = REFUSED;
       addr.log.ede = EDE_NOT_AUTH;
-      log_query(F_UPSTREAM | F_RCODE, "error", &addr, NULL);
+      log_query(F_UPSTREAM | F_RCODE, "error", &addr, NULL, 0);
       return resize_packet(header,  ansp - (unsigned char *)header, NULL, 0);
     }
   

src/blockdata.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -52,7 +52,7 @@ void blockdata_init(void)
 
 void blockdata_report(void)
 {
-  my_syslog(LOG_INFO, _("pool memory in use %u, max %u, allocated %u"), 
+  my_syslog(LOG_INFO, _("pool memory in use %zu, max %zu, allocated %zu"), 
 	    blockdata_count * sizeof(struct blockdata),  
 	    blockdata_hwm * sizeof(struct blockdata),  
 	    blockdata_alloced * sizeof(struct blockdata));

src/bpf.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/cache.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -30,50 +30,100 @@ static struct crec *really_insert(char *name, union all_addr *addr, unsigned sho
 				  time_t now,  unsigned long ttl, unsigned int flags);
 
 /* type->string mapping: this is also used by the name-hash function as a mixing table. */
+/* taken from https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml */
 static const struct {
   unsigned int type;
   const char * const name;
 } typestr[] = {
-  { 1,   "A" },
-  { 2,   "NS" },
-  { 5,   "CNAME" },
-  { 6,   "SOA" },
-  { 10,  "NULL" },
-  { 11,  "WKS" },
-  { 12,  "PTR" },
-  { 13,  "HINFO" },	
-  { 15,  "MX" },
-  { 16,  "TXT" },
-  { 22,  "NSAP" },
-  { 23,  "NSAP_PTR" },
-  { 24,  "SIG" },
-  { 25,  "KEY" },
-  { 28,  "AAAA" },
-  { 29,  "LOC" },
-  { 33,  "SRV" },
-  { 35,  "NAPTR" },
-  { 36,  "KX" },
-  { 37,  "CERT" },
-  { 38,  "A6" },
-  { 39,  "DNAME" },
-  { 41,  "OPT" },
-  { 43,  "DS" },
-  { 46,  "RRSIG" },
-  { 47,  "NSEC" },
-  { 48,  "DNSKEY" },
-  { 50,  "NSEC3" },
-  { 51,  "NSEC3PARAM" },
-  { 52,  "TLSA" },
-  { 53,  "SMIMEA" },
-  { 55,  "HIP" },
-  { 249, "TKEY" },
-  { 250, "TSIG" },
-  { 251, "IXFR" },
-  { 252, "AXFR" },
-  { 253, "MAILB" },
-  { 254, "MAILA" },
-  { 255, "ANY" },
-  { 257, "CAA" }
+  { 1,   "A" }, /* a host address [RFC1035] */
+  { 2,   "NS" }, /* an authoritative name server [RFC1035] */
+  { 3,   "MD" }, /* a mail destination (OBSOLETE - use MX) [RFC1035] */
+  { 4,   "MF" }, /* a mail forwarder (OBSOLETE - use MX) [RFC1035] */
+  { 5,   "CNAME" }, /* the canonical name for an alias [RFC1035] */
+  { 6,   "SOA" }, /* marks the start of a zone of authority [RFC1035] */
+  { 7,   "MB" }, /* a mailbox domain name (EXPERIMENTAL) [RFC1035] */
+  { 8,   "MG" }, /* a mail group member (EXPERIMENTAL) [RFC1035] */
+  { 9,   "MR" }, /* a mail rename domain name (EXPERIMENTAL) [RFC1035] */
+  { 10,  "NULL" }, /* a null RR (EXPERIMENTAL) [RFC1035] */
+  { 11,  "WKS" }, /* a well known service description [RFC1035] */
+  { 12,  "PTR" }, /* a domain name pointer [RFC1035] */
+  { 13,  "HINFO" }, /* host information [RFC1035] */
+  { 14,  "MINFO" }, /* mailbox or mail list information [RFC1035] */
+  { 15,  "MX" }, /* mail exchange [RFC1035] */
+  { 16,  "TXT" }, /* text strings [RFC1035] */
+  { 17,  "RP" }, /* for Responsible Person [RFC1183] */
+  { 18,  "AFSDB" }, /* for AFS Data Base location [RFC1183][RFC5864] */
+  { 19,  "X25" }, /* for X.25 PSDN address [RFC1183] */
+  { 20,  "ISDN" }, /* for ISDN address [RFC1183] */
+  { 21,  "RT" }, /* for Route Through [RFC1183] */
+  { 22,  "NSAP" }, /* for NSAP address, NSAP style A record [RFC1706] */
+  { 23,  "NSAP_PTR" }, /* for domain name pointer, NSAP style [RFC1348][RFC1637][RFC1706] */
+  { 24,  "SIG" }, /* for security signature [RFC2535][RFC2536][RFC2537][RFC2931][RFC3008][RFC3110][RFC3755][RFC4034] */
+  { 25,  "KEY" }, /* for security key [RFC2535][RFC2536][RFC2537][RFC2539][RFC3008][RFC3110][RFC3755][RFC4034] */
+  { 26,  "PX" }, /* X.400 mail mapping information [RFC2163] */
+  { 27,  "GPOS" }, /* Geographical Position [RFC1712] */
+  { 28,  "AAAA" }, /* IP6 Address [RFC3596] */
+  { 29,  "LOC" }, /* Location Information [RFC1876] */
+  { 30,  "NXT" }, /* Next Domain (OBSOLETE) [RFC2535][RFC3755] */
+  { 31,  "EID" }, /* Endpoint Identifier [Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt] 1995-06*/
+  { 32,  "NIMLOC" }, /* Nimrod Locator [1][Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt] 1995-06*/
+  { 33,  "SRV" }, /* Server Selection [1][RFC2782] */
+  { 34,  "ATMA" }, /* ATM Address [ ATM Forum Technical Committee, "ATM Name System, V2.0", Doc ID: AF-DANS-0152.000, July 2000. Available from and held in escrow by IANA.] */
+  { 35,  "NAPTR" }, /* Naming Authority Pointer [RFC2168][RFC2915][RFC3403] */
+  { 36,  "KX" }, /* Key Exchanger [RFC2230] */
+  { 37,  "CERT" }, /* CERT [RFC4398] */
+  { 38,  "A6" }, /* A6 (OBSOLETE - use AAAA) [RFC2874][RFC3226][RFC6563] */
+  { 39,  "DNAME" }, /* DNAME [RFC6672] */
+  { 40,  "SINK" }, /* SINK [Donald_E_Eastlake][http://tools.ietf.org/html/draft-eastlake-kitchen-sink] 1997-11*/
+  { 41,  "OPT" }, /* OPT [RFC3225][RFC6891] */
+  { 42,  "APL" }, /* APL [RFC3123] */
+  { 43,  "DS" }, /* Delegation Signer [RFC3658][RFC4034] */
+  { 44,  "SSHFP" }, /* SSH Key Fingerprint [RFC4255] */
+  { 45,  "IPSECKEY" }, /* IPSECKEY [RFC4025] */
+  { 46,  "RRSIG" }, /* RRSIG [RFC3755][RFC4034] */
+  { 47,  "NSEC" }, /* NSEC [RFC3755][RFC4034][RFC9077] */
+  { 48,  "DNSKEY" }, /* DNSKEY [RFC3755][RFC4034] */
+  { 49,  "DHCID" }, /* DHCID [RFC4701] */
+  { 50,  "NSEC3" }, /* NSEC3 [RFC5155][RFC9077] */
+  { 51,  "NSEC3PARAM" }, /* NSEC3PARAM [RFC5155] */
+  { 52,  "TLSA" }, /* TLSA [RFC6698] */
+  { 53,  "SMIMEA" }, /* S/MIME cert association [RFC8162] SMIMEA/smimea-completed-template 2015-12-01*/
+  { 55,  "HIP" }, /* Host Identity Protocol [RFC8005] */
+  { 56,  "NINFO" }, /* NINFO [Jim_Reid] NINFO/ninfo-completed-template 2008-01-21*/
+  { 57,  "RKEY" }, /* RKEY [Jim_Reid] RKEY/rkey-completed-template 2008-01-21*/
+  { 58,  "TALINK" }, /* Trust Anchor LINK [Wouter_Wijngaards] TALINK/talink-completed-template 2010-02-17*/
+  { 59,  "CDS" }, /* Child DS [RFC7344] CDS/cds-completed-template 2011-06-06*/
+  { 60,  "CDNSKEY" }, /* DNSKEY(s) the Child wants reflected in DS [RFC7344] 2014-06-16*/
+  { 61,  "OPENPGPKEY" }, /* OpenPGP Key [RFC7929] OPENPGPKEY/openpgpkey-completed-template 2014-08-12*/
+  { 62,  "CSYNC" }, /* Child-To-Parent Synchronization [RFC7477] 2015-01-27*/
+  { 63,  "ZONEMD" }, /* Message Digest Over Zone Data [RFC8976] ZONEMD/zonemd-completed-template 2018-12-12*/
+  { 64,  "SVCB" }, /* Service Binding [draft-ietf-dnsop-svcb-https-00] SVCB/svcb-completed-template 2020-06-30*/
+  { 65,  "HTTPS" }, /* HTTPS Binding [draft-ietf-dnsop-svcb-https-00] HTTPS/https-completed-template 2020-06-30*/
+  { 99,  "SPF" }, /* [RFC7208] */
+  { 100, "UINFO" }, /* [IANA-Reserved] */
+  { 101, "UID" }, /* [IANA-Reserved] */
+  { 102, "GID" }, /* [IANA-Reserved] */
+  { 103, "UNSPEC" }, /* [IANA-Reserved] */
+  { 104, "NID" }, /* [RFC6742] ILNP/nid-completed-template */
+  { 105, "L32" }, /* [RFC6742] ILNP/l32-completed-template */
+  { 106, "L64" }, /* [RFC6742] ILNP/l64-completed-template */
+  { 107, "LP" }, /* [RFC6742] ILNP/lp-completed-template */
+  { 108, "EUI48" }, /* an EUI-48 address [RFC7043] EUI48/eui48-completed-template 2013-03-27*/
+  { 109, "EUI64" }, /* an EUI-64 address [RFC7043] EUI64/eui64-completed-template 2013-03-27*/
+  { 249, "TKEY" }, /* Transaction Key [RFC2930] */
+  { 250, "TSIG" }, /* Transaction Signature [RFC8945] */
+  { 251, "IXFR" }, /* incremental transfer [RFC1995] */
+  { 252, "AXFR" }, /* transfer of an entire zone [RFC1035][RFC5936] */
+  { 253, "MAILB" }, /* mailbox-related RRs (MB, MG or MR) [RFC1035] */
+  { 254, "MAILA" }, /* mail agent RRs (OBSOLETE - see MX) [RFC1035] */
+  { 255, "ANY" }, /* A request for some or all records the server has available [RFC1035][RFC6895][RFC8482] */
+  { 256, "URI" }, /* URI [RFC7553] URI/uri-completed-template 2011-02-22*/
+  { 257, "CAA" }, /* Certification Authority Restriction [RFC8659] CAA/caa-completed-template 2011-04-07*/
+  { 258, "AVC" }, /* Application Visibility and Control [Wolfgang_Riedel] AVC/avc-completed-template 2016-02-26*/
+  { 259, "DOA" }, /* Digital Object Architecture [draft-durand-doa-over-dns] DOA/doa-completed-template 2017-08-30*/
+  { 260, "AMTRELAY" }, /* Automatic Multicast Tunneling Relay [RFC8777] AMTRELAY/amtrelay-completed-template 2019-02-06*/
+  { 32768,  "TA" }, /* DNSSEC Trust Authorities [Sam_Weiler][http://cameo.library.cmu.edu/][ Deploying DNSSEC Without a Signed Root. Technical Report 1999-19, Information Networking Institute, Carnegie Mellon University, April 2004.] 2005-12-13*/
+  { 32769,  "DLV" }, /* DNSSEC Lookaside Validation (OBSOLETE) [RFC8749][RFC4431] */
 };
 
 static void cache_free(struct crec *crecp);
@@ -363,7 +413,7 @@ static struct crec *cache_scan_free(char *name, union all_addr *addr, unsigned s
 	  if ((crecp->flags & F_FORWARD) && hostname_isequal(cache_get_name(crecp), name))
 	    {
 	      /* Don't delete DNSSEC in favour of a CNAME, they can co-exist */
-	      if ((flags & crecp->flags & (F_IPV4 | F_IPV6 | F_SRV)) || 
+	      if ((flags & crecp->flags & (F_IPV4 | F_IPV6 | F_SRV | F_NXDOMAIN)) || 
 		  (((crecp->flags | flags) & F_CNAME) && !(crecp->flags & (F_DNSKEY | F_DS))))
 		{
 		  if (crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG))
@@ -433,7 +483,7 @@ static struct crec *cache_scan_free(char *name, union all_addr *addr, unsigned s
 	  else if (!(crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) &&
 		   (flags & crecp->flags & F_REVERSE) && 
 		   (flags & crecp->flags & (F_IPV4 | F_IPV6)) &&
-		   memcmp(&crecp->addr, addr, addrlen) == 0)
+		   addr && memcmp(&crecp->addr, addr, addrlen) == 0)
 	    {
 	      *up = crecp->hash_next;
 	      cache_unlink(crecp);
@@ -1349,10 +1399,12 @@ struct in_addr a_record_from_hosts(char *name, time_t now)
   struct crec *crecp = NULL;
   struct in_addr ret;
   
-  while ((crecp = cache_find_by_name(crecp, name, now, F_IPV4)))
-    if (crecp->flags & F_HOSTS)
-      return crecp->addr.addr4;
-
+  /* If no DNS service, cache not initialised. */
+  if (daemon->port != 0)
+    while ((crecp = cache_find_by_name(crecp, name, now, F_IPV4)))
+      if (crecp->flags & F_HOSTS)
+	return crecp->addr.addr4;
+  
   my_syslog(MS_DHCP | LOG_WARNING, _("No IPv4 address found for %s"), name);
   
   ret.s_addr = 0;
@@ -1547,7 +1599,8 @@ static void make_non_terminals(struct crec *source)
       if (crecp)
 	{
 	  crecp->flags = (source->flags | F_NAMEP) & ~(F_IPV4 | F_IPV6 | F_CNAME | F_SRV | F_DNSKEY | F_DS | F_REVERSE);
-	  crecp->ttd = source->ttd;
+	  if (!(crecp->flags & F_IMMORTAL))
+	    crecp->ttd = source->ttd;
 	  crecp->name.namep = name;
 	  
 	  cache_hash(crecp);
@@ -1704,7 +1757,8 @@ void dump_cache(time_t now)
     {
       struct crec *cache ;
       int i;
-      my_syslog(LOG_INFO, "Host                                     Address                        Flags      Expires");
+      my_syslog(LOG_INFO, "Host                           Address                                  Flags      Expires                  Source");
+      my_syslog(LOG_INFO, "------------------------------ ---------------------------------------- ---------- ------------------------ ------------");
     
       for (i=0; i<hash_size; i++)
 	for (cache = hash_table[i]; cache; cache = cache->hash_next)
@@ -1762,7 +1816,10 @@ void dump_cache(time_t now)
 	    else if (cache->flags & F_DNSKEY)
 	      t = "K";
 #endif
-	    p += sprintf(p, "%-40.40s %s%s%s%s%s%s%s%s%s  ", a, t,
+	    else /* non-terminal */
+	      t = "!";
+
+	    p += sprintf(p, "%-40.40s %s%s%s%s%s%s%s%s%s%s ", a, t,
 			 cache->flags & F_FORWARD ? "F" : " ",
 			 cache->flags & F_REVERSE ? "R" : " ",
 			 cache->flags & F_IMMORTAL ? "I" : " ",
@@ -1770,14 +1827,16 @@ void dump_cache(time_t now)
 			 cache->flags & F_NEG ? "N" : " ",
 			 cache->flags & F_NXDOMAIN ? "X" : " ",
 			 cache->flags & F_HOSTS ? "H" : " ",
+			 cache->flags & F_CONFIG ? "C" : " ",
 			 cache->flags & F_DNSSECOK ? "V" : " ");
 #ifdef HAVE_BROKEN_RTC
-	    p += sprintf(p, "%lu", cache->flags & F_IMMORTAL ? 0: (unsigned long)(cache->ttd - now));
+	    p += sprintf(p, "%-24lu", cache->flags & F_IMMORTAL ? 0: (unsigned long)(cache->ttd - now));
 #else
-	    p += sprintf(p, "%s", cache->flags & F_IMMORTAL ? "\n" : ctime(&(cache->ttd)));
-	    /* ctime includes trailing \n - eat it */
-	    *(p-1) = 0;
+	    p += sprintf(p, "%-24.24s", cache->flags & F_IMMORTAL ? "" : ctime(&(cache->ttd)));
 #endif
+	    if(cache->flags & (F_HOSTS | F_CONFIG) && cache->uid > 0)
+		p += sprintf(p, " %s", record_source(cache->uid));
+
 	    my_syslog(LOG_INFO, "%s", daemon->namebuff);
 	  }
     }
@@ -1805,7 +1864,7 @@ char *record_source(unsigned int index)
   return "<unknown>";
 }
 
-char *querystr(char *desc, unsigned short type)
+static char *querystr(char *desc, unsigned short type)
 {
   unsigned int i;
   int len = 10; /* strlen("type=xxxxx") */
@@ -1893,15 +1952,20 @@ static char *edestr(int ede)
     }
 }
 
-void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg)
+void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg, unsigned short type)
 {
   char *source, *dest = arg;
   char *verb = "is";
   char *extra = "";
+  char portstring[7]; /* space for #<portnum> */
   
   if (!option_bool(OPT_LOG))
     return;
-  
+
+  /* build query type string if requested */
+  if (!(flags & (F_SERVER | F_IPSET)) && type > 0)
+    arg = querystr(arg, type);
+
 #ifdef HAVE_DNSSEC
   if ((flags & F_DNSSECOK) && option_bool(OPT_EXTRALOG))
     extra = " (DNSSEC signed)";
@@ -1935,8 +1999,15 @@ void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg)
 	    }
 	}
       else if (flags & (F_IPV4 | F_IPV6))
-	inet_ntop(flags & F_IPV4 ? AF_INET : AF_INET6,
-		  addr, daemon->addrbuff, ADDRSTRLEN);
+	{
+	  inet_ntop(flags & F_IPV4 ? AF_INET : AF_INET6,
+		    addr, daemon->addrbuff, ADDRSTRLEN);
+	  if ((flags & F_SERVER) && type != NAMESERVER_PORT)
+	    {
+	      extra = portstring;
+	      sprintf(portstring, "#%u", type);
+	    }
+	}
       else
 	dest = arg;
     }
@@ -1988,7 +2059,12 @@ void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg)
     }
   else if (flags & F_AUTH)
     source = "auth";
-  else if (flags & F_SERVER)
+   else if (flags & F_DNSSEC)
+    {
+      source = arg;
+      verb = "to";
+    }
+   else if (flags & F_SERVER)
     {
       source = "forwarded";
       verb = "to";
@@ -1998,14 +2074,9 @@ void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg)
       source = arg;
       verb = "from";
     }
-  else if (flags & F_DNSSEC)
-    {
-      source = arg;
-      verb = "to";
-    }
   else if (flags & F_IPSET)
     {
-      source = "ipset add";
+      source = type ? "ipset add" : "nftset add";
       dest = name;
       name = arg;
       verb = daemon->addrbuff;
@@ -2013,7 +2084,7 @@ void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg)
   else
     source = "cached";
   
-  if (strlen(name) == 0)
+  if (name && !name[0])
     name = ".";
 
   if (option_bool(OPT_EXTRALOG))

src/config.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -20,7 +20,7 @@
 #define TCP_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
 #define TCP_BACKLOG 32  /* kernel backlog limit for TCP connections */
 #define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
-#define SAFE_PKTSZ 1280 /* "go anywhere" UDP packet size */
+#define SAFE_PKTSZ 1232 /* "go anywhere" UDP packet size, see https://dnsflagday.net/2020/ */
 #define KEYBLOCK_LEN 40 /* choose to minimise fragmentation when storing DNSSEC keys */
 #define DNSSEC_WORK 50 /* Max number of queries to validate one question */
 #define TIMEOUT 10     /* drop UDP queries after TIMEOUT seconds */
@@ -115,6 +115,10 @@ HAVE_IPSET
     define this to include the ability to selectively add resolved ip addresses
     to given ipsets.
 
+HAVE_NFTSET
+    define this to include the ability to selectively add resolved ip addresses
+    to given nftables sets.
+
 HAVE_AUTH
    define this to include the facility to act as an authoritative DNS
    server for one or more zones.
@@ -192,7 +196,7 @@ RESOLVFILE
 /* #define HAVE_CONNTRACK */
 /* #define HAVE_CRYPTOHASH */
 /* #define HAVE_DNSSEC */
-
+/* #define HAVE_NFTSET */
 
 /* Default locations for important system files. */
 
@@ -420,6 +424,10 @@ static char *compile_opts =
 "no-"
 #endif
 "ipset "
+#ifndef HAVE_NFTSET
+"no-"
+#endif
+"nftset "
 #ifndef HAVE_AUTH
 "no-"
 #endif

src/conntrack.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/crypto.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/dbus.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -52,6 +52,9 @@ const char* introspection_xml_template =
 "    <method name=\"SetFilterWin2KOption\">\n"
 "      <arg name=\"filterwin2k\" direction=\"in\" type=\"b\"/>\n"
 "    </method>\n"
+"    <method name=\"SetLocaliseQueriesOption\">\n"
+"      <arg name=\"localise-queries\" direction=\"in\" type=\"b\"/>\n"
+"    </method>\n"
 "    <method name=\"SetBogusPrivOption\">\n"
 "      <arg name=\"boguspriv\" direction=\"in\" type=\"b\"/>\n"
 "    </method>\n"
@@ -114,7 +117,7 @@ static dbus_bool_t add_watch(DBusWatch *watch, void *data)
   w->next = daemon->watches;
   daemon->watches = w;
 
-  w = data; /* no warning */
+  (void)data; /* no warning */
   return TRUE;
 }
 
@@ -134,16 +137,20 @@ static void remove_watch(DBusWatch *watch, void *data)
 	up = &(w->next);
     }
 
-  w = data; /* no warning */
+  (void)data; /* no warning */
 }
 
-static void dbus_read_servers(DBusMessage *message)
+static DBusMessage* dbus_read_servers(DBusMessage *message)
 {
   DBusMessageIter iter;
   union  mysockaddr addr, source_addr;
   char *domain;
   
-  dbus_message_iter_init(message, &iter);
+  if (!dbus_message_iter_init(message, &iter))
+    {
+      return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
+                                    "Failed to initialize dbus message iter");
+    }
 
   mark_servers(SERV_FROM_DBUS);
   
@@ -222,6 +229,7 @@ static void dbus_read_servers(DBusMessage *message)
    
   /* unlink and free anything still marked. */
   cleanup_servers();
+  return NULL;
 }
 
 #ifdef HAVE_LOOP
@@ -545,6 +553,10 @@ static DBusMessage *dbus_add_lease(DBusMessage* message)
 					 "Invalid IP address '%s'", ipaddr);
    
   hw_len = parse_hex((char*)hwaddr, dhcp_chaddr, DHCP_CHADDR_MAX, NULL, &hw_type);
+  if (hw_len < 0)
+    return dbus_message_new_error_printf(message, DBUS_ERROR_INVALID_ARGS,
+					 "Invalid HW address '%s'", hwaddr);
+
   if (hw_type == 0 && hw_len != 0)
     hw_type = ARPHRD_ETHER;
   
@@ -668,7 +680,7 @@ DBusHandlerResult message_handler(DBusConnection *connection,
 #endif
   else if (strcmp(method, "SetServers") == 0)
     {
-      dbus_read_servers(message);
+      reply = dbus_read_servers(message);
       new_servers = 1;
     }
   else if (strcmp(method, "SetServersEx") == 0)
@@ -685,6 +697,10 @@ DBusHandlerResult message_handler(DBusConnection *connection,
     {
       reply = dbus_set_bool(message, OPT_FILTER, "filterwin2k");
     }
+  else if (strcmp(method, "SetLocaliseQueriesOption") == 0)
+    {
+      reply = dbus_set_bool(message, OPT_LOCALISE, "localise-queries");
+    }
   else if (strcmp(method, "SetBogusPrivOption") == 0)
     {
       reply = dbus_set_bool(message, OPT_BOGUSPRIV, "bogus-priv");
@@ -719,7 +735,7 @@ DBusHandlerResult message_handler(DBusConnection *connection,
   if (clear_cache)
     clear_cache_and_reload(dnsmasq_time());
   
-  method = user_data; /* no warning */
+  (void)user_data; /* no warning */
 
   /* If no reply or no error, return nothing */
   if (!reply)

src/dhcp-common.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -88,7 +88,7 @@ int match_netid_wild(struct dhcp_netid *check, struct dhcp_netid *pool)
   for (; check; check = check->next)
     {
       const int check_len = strlen(check->net);
-      const int is_wc = (check->net[check_len - 1] == '*');
+      const int is_wc = (check_len > 0 && check->net[check_len - 1] == '*');
       
       /* '#' for not is for backwards compat. */
       if (check->net[0] != '!' && check->net[0] != '#')
@@ -566,12 +566,16 @@ char *whichdevice(void)
       }
 
   if (found)
-    return found->name;
-
+    {
+      char *ret = safe_malloc(strlen(found->name)+1);
+      strcpy(ret, found->name);
+      return ret;
+    }
+  
   return NULL;
 }
  
-void  bindtodevice(char *device, int fd)
+static int bindtodevice(char *device, int fd)
 {
   size_t len = strlen(device)+1;
   if (len > IFNAMSIZ)
@@ -579,7 +583,33 @@ void  bindtodevice(char *device, int fd)
   /* only allowed by root. */
   if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, device, len) == -1 &&
       errno != EPERM)
-    die(_("failed to set SO_BINDTODEVICE on DHCP socket: %s"), NULL, EC_BADNET);
+    return 2;
+  
+  return 1;
+}
+
+int bind_dhcp_devices(char *bound_device)
+{
+  int ret = 0;
+
+  if (bound_device)
+    {
+      if (daemon->dhcp)
+	{
+	  if (!daemon->relay4)
+	    ret |= bindtodevice(bound_device, daemon->dhcpfd);
+	  
+	  if (daemon->enable_pxe && daemon->pxefd != -1)
+	    ret |= bindtodevice(bound_device, daemon->pxefd);
+	}
+      
+#if defined(HAVE_DHCP6)
+      if (daemon->doing_dhcp6 && !daemon->relay6)
+	ret |= bindtodevice(bound_device, daemon->dhcp6fd);
+#endif
+    }
+  
+  return ret;
 }
 #endif
 
@@ -985,11 +1015,27 @@ void log_context(int family, struct dhcp_context *context)
 
 void log_relay(int family, struct dhcp_relay *relay)
 {
+  int broadcast = relay->server.addr4.s_addr == 0;
   inet_ntop(family, &relay->local, daemon->addrbuff, ADDRSTRLEN);
   inet_ntop(family, &relay->server, daemon->namebuff, ADDRSTRLEN); 
 
+#ifdef HAVE_DHCP6
+  struct in6_addr multicast;
+
+  inet_pton(AF_INET6, ALL_SERVERS, &multicast);
+
+  if (family == AF_INET6)
+    broadcast = IN6_ARE_ADDR_EQUAL(&relay->server.addr6, &multicast);
+#endif
+  
+  
   if (relay->interface)
-    my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay from %s to %s via %s"), daemon->addrbuff, daemon->namebuff, relay->interface);
+    {
+      if (broadcast)
+	my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay from %s via %s"), daemon->addrbuff, relay->interface);
+      else
+	my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay from %s to %s via %s"), daemon->addrbuff, daemon->namebuff, relay->interface);
+    }
   else
     my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay from %s to %s"), daemon->addrbuff, daemon->namebuff);
 }

src/dhcp-protocol.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/dhcp.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -20,8 +20,6 @@
 
 struct iface_param {
   struct dhcp_context *current;
-  struct dhcp_relay *relay;
-  struct in_addr relay_local;
   int ind;
 };
 
@@ -34,7 +32,7 @@ static int complete_context(struct in_addr local, int if_index, char *label,
 			    struct in_addr netmask, struct in_addr broadcast, void *vparam);
 static int check_listen_addrs(struct in_addr local, int if_index, char *label,
 			      struct in_addr netmask, struct in_addr broadcast, void *vparam);
-static int relay_upstream4(struct dhcp_relay *relay, struct dhcp_packet *mess, size_t sz, int iface_index);
+static int relay_upstream4(int iface_index, struct dhcp_packet *mess, size_t sz);
 static struct dhcp_relay *relay_reply4(struct dhcp_packet *mess, char *arrival_interface);
 
 static int make_fd(int port)
@@ -177,11 +175,16 @@ void dhcp_packet(time_t now, int pxe_fd)
   if ((sz = recv_dhcp_packet(fd, &msg)) == -1 || 
       (sz < (ssize_t)(sizeof(*mess) - sizeof(mess->options)))) 
     return;
-    
-  #if defined (HAVE_LINUX_NETWORK)
+  
+#ifdef HAVE_DUMPFILE
+  dump_packet(DUMP_DHCP, (void *)daemon->dhcp_packet.iov_base, sz, (union mysockaddr *)&dest, NULL,
+	      pxe_fd ? PXE_PORT : daemon->dhcp_server_port);
+#endif
+  
+#if defined (HAVE_LINUX_NETWORK)
   if (ioctl(fd, SIOCGSTAMP, &tv) == 0)
     recvtime = tv.tv_sec;
-
+  
   if (msg.msg_controllen >= sizeof(struct cmsghdr))
     for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
       if (cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_PKTINFO)
@@ -302,12 +305,7 @@ void dhcp_packet(time_t now, int pxe_fd)
       for (context = daemon->dhcp; context; context = context->next)
 	context->current = context;
       
-      for (relay = daemon->relay4; relay; relay = relay->next)
-	relay->current = relay;
-      
       parm.current = NULL;
-      parm.relay = NULL;
-      parm.relay_local.s_addr = 0;
       parm.ind = iface_index;
       
       if (!iface_check(AF_INET, (union all_addr *)&iface_addr, ifr.ifr_name, NULL))
@@ -329,15 +327,19 @@ void dhcp_packet(time_t now, int pxe_fd)
 	     there is more than one address on the interface in the same subnet */
 	  complete_context(match.addr, iface_index, NULL, match.netmask, match.broadcast, &parm);
 	}    
+            
+      if (relay_upstream4(iface_index, mess, (size_t)sz))
+	return;
       
       if (!iface_enumerate(AF_INET, &parm, complete_context))
 	return;
 
-      /* We're relaying this request */
-      if  (parm.relay_local.s_addr != 0 &&
-	   relay_upstream4(parm.relay, mess, (size_t)sz, iface_index))
+      /* Check for a relay again after iface_enumerate/complete_context has had
+	 chance to fill in relay->iface_index fields. This handles first time through
+	 and any changes in interface config. */
+       if (relay_upstream4(iface_index, mess, (size_t)sz))
 	return;
-
+       
       /* May have configured relay, but not DHCP server */
       if (!daemon->dhcp)
 	return;
@@ -455,6 +457,17 @@ void dhcp_packet(time_t now, int pxe_fd)
 #elif defined(HAVE_BSD_NETWORK)
   else 
     {
+#ifdef HAVE_DUMPFILE
+      if (ntohs(mess->flags) & 0x8000)
+        dest.sin_addr.s_addr = INADDR_BROADCAST;
+      else
+        dest.sin_addr = mess->yiaddr;
+      dest.sin_port = htons(daemon->dhcp_client_port);
+      
+      dump_packet(DUMP_DHCP, (void *)iov.iov_base, iov.iov_len, NULL,
+		  (union mysockaddr *)&dest, daemon->dhcp_server_port);
+#endif
+      
       send_via_bpf(mess, iov.iov_len, iface_addr, &ifr);
       return;
     }
@@ -463,6 +476,11 @@ void dhcp_packet(time_t now, int pxe_fd)
 #ifdef HAVE_SOLARIS_NETWORK
   setsockopt(fd, IPPROTO_IP, IP_BOUND_IF, &iface_index, sizeof(iface_index));
 #endif
+
+#ifdef HAVE_DUMPFILE
+  dump_packet(DUMP_DHCP, (void *)iov.iov_base, iov.iov_len, NULL,
+	      (union mysockaddr *)&dest, daemon->dhcp_server_port);
+#endif
   
   while(retry_send(sendmsg(fd, &msg, 0)));
 
@@ -613,14 +631,9 @@ static int complete_context(struct in_addr local, int if_index, char *label,
     }
 
   for (relay = daemon->relay4; relay; relay = relay->next)
-    if (if_index == param->ind && relay->local.addr4.s_addr == local.s_addr && relay->current == relay &&
-	(param->relay_local.s_addr == 0 || param->relay_local.s_addr == local.s_addr))
-      {
-	relay->current = param->relay;
-	param->relay = relay;
-	param->relay_local = local;	
-      }
-
+    if (relay->local.addr4.s_addr == local.s_addr)
+      relay->iface_index = if_index;
+  
   return 1;
 }
 	  
@@ -1061,53 +1074,96 @@ char *host_from_dns(struct in_addr addr)
   return NULL;
 }
 
-static int  relay_upstream4(struct dhcp_relay *relay, struct dhcp_packet *mess, size_t sz, int iface_index)
+static int relay_upstream4(int iface_index, struct dhcp_packet *mess, size_t sz)
 {
-  /* ->local is same value for all relays on ->current chain */
-  union all_addr from;
-  
+  struct in_addr giaddr = mess->giaddr;
+  u8 hops = mess->hops;
+  struct dhcp_relay *relay;
+
   if (mess->op != BOOTREQUEST)
     return 0;
 
-  /* source address == relay address */
-  from.addr4 = relay->local.addr4;
+  for (relay = daemon->relay4; relay; relay = relay->next)
+    if (relay->iface_index != 0 && relay->iface_index == iface_index)
+      break;
+
+  /* No relay config. */
+  if (!relay)
+    return 0;
   
-  /* already gatewayed ? */
-  if (mess->giaddr.s_addr)
-    {
-      /* if so check if by us, to stomp on loops. */
-      if (mess->giaddr.s_addr == relay->local.addr4.s_addr)
-	return 1;
-    }
-  else
-    {
-      /* plug in our address */
-      mess->giaddr.s_addr = relay->local.addr4.s_addr;
-    }
+  for (; relay; relay = relay->next)
+    if (relay->iface_index != 0 && relay->iface_index == iface_index)
+      {
+	union mysockaddr to;
+	union all_addr from;
 
-  if ((mess->hops++) > 20)
-    return 1;
+	mess->hops = hops;
+	mess->giaddr = giaddr;
+	
+	if ((mess->hops++) > 20)
+	  continue;
+	
+	/* source address == relay address */
+	from.addr4 = relay->local.addr4;
 
-  for (; relay; relay = relay->current)
-    {
-      union mysockaddr to;
-      
-      to.sa.sa_family = AF_INET;
-      to.in.sin_addr = relay->server.addr4;
-      to.in.sin_port = htons(daemon->dhcp_server_port);
-      
-      send_from(daemon->dhcpfd, 0, (char *)mess, sz, &to, &from, 0);
-      
-      if (option_bool(OPT_LOG_OPTS))
+	/* already gatewayed ? */
+	if (giaddr.s_addr)
+	  {
+	    /* if so check if by us, to stomp on loops. */
+	    if (giaddr.s_addr == relay->local.addr4.s_addr)
+	      continue;
+	  }
+	else
+	  {
+	    /* plug in our address */
+	    mess->giaddr.s_addr = relay->local.addr4.s_addr;
+	  }
+	
+	to.sa.sa_family = AF_INET;
+	to.in.sin_addr = relay->server.addr4;
+	to.in.sin_port = htons(daemon->dhcp_server_port);
+	
+	/* Broadcasting to server. */
+	if (relay->server.addr4.s_addr == 0)
+	  {
+	    struct ifreq ifr;
+	    
+	    if (relay->interface)
+	      safe_strncpy(ifr.ifr_name, relay->interface, IF_NAMESIZE);
+	    
+	    if (!relay->interface || strchr(relay->interface, '*') ||
+		ioctl(daemon->dhcpfd, SIOCGIFBRDADDR, &ifr) == -1)
+	      {
+		my_syslog(MS_DHCP | LOG_ERR, _("Cannot broadcast DHCP relay via interface %s"), relay->interface);
+		continue;
+	      }
+	    
+	    to.in.sin_addr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
+	  }
+	
+#ifdef HAVE_DUMPFILE
 	{
-	  inet_ntop(AF_INET, &relay->local, daemon->addrbuff, ADDRSTRLEN);
-	  inet_ntop(AF_INET, &relay->server.addr4, daemon->dhcp_buff2, DHCP_BUFF_SZ);
-	  my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay %s -> %s"), daemon->addrbuff, daemon->dhcp_buff2);
+	  union mysockaddr fromsock;
+	  fromsock.in.sin_port = htons(daemon->dhcp_server_port);
+	  fromsock.in.sin_addr = from.addr4;
+	  fromsock.sa.sa_family = AF_INET;
+	  
+	  dump_packet(DUMP_DHCP, (void *)mess, sz, &fromsock, &to, 0);
 	}
-      
-      /* Save this for replies */
-      relay->iface_index = iface_index;
-    }
+#endif
+	
+	 send_from(daemon->dhcpfd, 0, (char *)mess, sz, &to, &from, 0);
+	 
+	 if (option_bool(OPT_LOG_OPTS))
+	   {
+	     inet_ntop(AF_INET, &relay->local, daemon->addrbuff, ADDRSTRLEN);
+	     if (relay->server.addr4.s_addr == 0)
+	       snprintf(daemon->dhcp_buff2, DHCP_BUFF_SZ, _("broadcast via %s"), relay->interface);
+	     else
+	       inet_ntop(AF_INET, &relay->server.addr4, daemon->dhcp_buff2, DHCP_BUFF_SZ);
+	     my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay at %s -> %s"), daemon->addrbuff, daemon->dhcp_buff2);
+	   }
+      }
   
   return 1;
 }

src/dhcp6-protocol.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -55,6 +55,8 @@
 #define OPTION6_RECONF_ACCEPT   20
 #define OPTION6_DNS_SERVER      23
 #define OPTION6_DOMAIN_SEARCH   24
+#define OPTION6_IA_PD           25
+#define OPTION6_IAPREFIX        26
 #define OPTION6_REFRESH_TIME    32
 #define OPTION6_REMOTE_ID       37
 #define OPTION6_SUBSCRIBER_ID   38

src/dhcp6.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -22,8 +22,7 @@
 
 struct iface_param {
   struct dhcp_context *current;
-  struct dhcp_relay *relay;
-  struct in6_addr fallback, relay_local, ll_addr, ula_addr;
+  struct in6_addr fallback, ll_addr, ula_addr;
   int ind, addr_match;
 };
 
@@ -90,7 +89,6 @@ void dhcp6_init(void)
 void dhcp6_packet(time_t now)
 {
   struct dhcp_context *context;
-  struct dhcp_relay *relay;
   struct iface_param parm;
   struct cmsghdr *cmptr;
   struct msghdr msg;
@@ -105,7 +103,8 @@ void dhcp6_packet(time_t now)
   struct iname *tmp;
   unsigned short port;
   struct in6_addr dst_addr;
-
+  struct in6_addr all_servers;
+  
   memset(&dst_addr, 0, sizeof(dst_addr));
 
   msg.msg_control = control_u.control6;
@@ -119,6 +118,11 @@ void dhcp6_packet(time_t now)
   if ((sz = recv_dhcp_packet(daemon->dhcp6fd, &msg)) == -1)
     return;
   
+#ifdef HAVE_DUMPFILE
+  dump_packet(DUMP_DHCPV6, (void *)daemon->dhcp_packet.iov_base, sz,
+	      (union mysockaddr *)&from, NULL, DHCPV6_SERVER_PORT);
+#endif
+  
   for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
     if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo)
       {
@@ -135,9 +139,13 @@ void dhcp6_packet(time_t now)
   if (!indextoname(daemon->dhcp6fd, if_index, ifr.ifr_name))
     return;
 
-  if ((port = relay_reply6(&from, sz, ifr.ifr_name)) != 0)
+  if (relay_reply6(&from, sz, ifr.ifr_name))
     {
-      from.sin6_port = htons(port);
+#ifdef HAVE_DUMPFILE
+      dump_packet(DUMP_DHCPV6, (void *)daemon->outpacket.iov_base, save_counter(-1), NULL,
+		  (union mysockaddr *)&from, DHCPV6_SERVER_PORT);
+#endif
+      
       while (retry_send(sendto(daemon->dhcp6fd, daemon->outpacket.iov_base, 
 			       save_counter(-1), 0, (struct sockaddr *)&from, 
 			       sizeof(from))));
@@ -145,7 +153,7 @@ void dhcp6_packet(time_t now)
   else
     {
       struct dhcp_bridge *bridge, *alias;
-
+      
       for (tmp = daemon->if_except; tmp; tmp = tmp->next)
 	if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
 	  return;
@@ -155,14 +163,12 @@ void dhcp6_packet(time_t now)
 	  return;
       
       parm.current = NULL;
-      parm.relay = NULL;
-      memset(&parm.relay_local, 0, IN6ADDRSZ);
       parm.ind = if_index;
       parm.addr_match = 0;
       memset(&parm.fallback, 0, IN6ADDRSZ);
       memset(&parm.ll_addr, 0, IN6ADDRSZ);
       memset(&parm.ula_addr, 0, IN6ADDRSZ);
-
+      
       /* If the interface on which the DHCPv6 request was received is
          an alias of some other interface (as specified by the
          --bridge-interface option), change parm.ind so that we look
@@ -200,13 +206,25 @@ void dhcp6_packet(time_t now)
 	    context->current = context;
 	    memset(&context->local6, 0, IN6ADDRSZ);
 	  }
-
-      for (relay = daemon->relay6; relay; relay = relay->next)
-	relay->current = relay;
+      
+      /* Ignore requests sent to the ALL_SERVERS multicast address for relay when
+	 we're listening there for DHCPv6 server reasons. */
+      inet_pton(AF_INET6, ALL_SERVERS, &all_servers);
+      
+      if (!IN6_ARE_ADDR_EQUAL(&dst_addr, &all_servers) &&
+	  relay_upstream6(if_index, (size_t)sz, &from.sin6_addr, from.sin6_scope_id, now))
+	return;
       
       if (!iface_enumerate(AF_INET6, &parm, complete_context6))
 	return;
-
+      
+      /* Check for a relay again after iface_enumerate/complete_context has had
+	 chance to fill in relay->iface_index fields. This handles first time through
+	 and any changes in interface config. */
+      if (!IN6_ARE_ADDR_EQUAL(&dst_addr, &all_servers) &&
+	  relay_upstream6(if_index, (size_t)sz, &from.sin6_addr, from.sin6_scope_id, now))
+	return;
+      
       if (daemon->if_names || daemon->if_addrs)
 	{
 	  
@@ -218,23 +236,10 @@ void dhcp6_packet(time_t now)
 	    return;
 	}
       
-      if (parm.relay)
-	{
-	  /* Ignore requests sent to the ALL_SERVERS multicast address for relay when
-	     we're listening there for DHCPv6 server reasons. */
-	  struct in6_addr all_servers;
-	  
-	  inet_pton(AF_INET6, ALL_SERVERS, &all_servers);
-	  
-	  if (!IN6_ARE_ADDR_EQUAL(&dst_addr, &all_servers))
-	    relay_upstream6(parm.relay, sz, &from.sin6_addr, from.sin6_scope_id, now);
-	  return;
-	}
-      
       /* May have configured relay, but not DHCP server */
       if (!daemon->doing_dhcp6)
 	return;
-
+      
       lease_prune(NULL, now); /* lose any expired leases */
       
       port = dhcp6_reply(parm.current, if_index, ifr.ifr_name, &parm.fallback, 
@@ -247,11 +252,16 @@ void dhcp6_packet(time_t now)
       if (port != 0)
 	{
 	  from.sin6_port = htons(port);
-	  while (retry_send(sendto(daemon->dhcp6fd, daemon->outpacket.iov_base, 
-				   save_counter(-1), 0, (struct sockaddr *)&from, 
-				   sizeof(from))));
+	  
+#ifdef HAVE_DUMPFILE
+	  dump_packet(DUMP_DHCPV6, (void *)daemon->outpacket.iov_base, save_counter(-1),
+		      NULL, (union mysockaddr *)&from, DHCPV6_SERVER_PORT);
+#endif 
+	  
+	  while (retry_send(sendto(daemon->dhcp6fd, daemon->outpacket.iov_base,
+				   save_counter(-1), 0, (struct sockaddr *)&from, sizeof(from))));
 	}
-
+      
       /* These need to be called _after_ we send DHCPv6 packet, since lease_update_file()
 	 may trigger sending an RA packet, which overwrites our buffer. */
       lease_update_file(now);
@@ -292,7 +302,7 @@ void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsi
       if ((maclen = find_mac(&addr, mac, 0, now)) != 0)
 	break;
 	  
-      sendto(daemon->icmp6fd, &neigh, sizeof(neigh), 0, &addr.sa, sizeof(addr));
+      while(retry_send(sendto(daemon->icmp6fd, &neigh, sizeof(neigh), 0, &addr.sa, sizeof(addr))));
       
       ts.tv_sec = 0;
       ts.tv_nsec = 100000000; /* 100ms */
@@ -312,6 +322,7 @@ static int complete_context6(struct in6_addr *local,  int prefix,
   struct dhcp_relay *relay;
   struct iface_param *param = vparam;
   struct iname *tmp;
+  int match = !daemon->if_addrs;
  
   (void)scope; /* warning */
   
@@ -333,7 +344,7 @@ static int complete_context6(struct in6_addr *local,  int prefix,
   for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
     if (tmp->addr.sa.sa_family == AF_INET6 &&
 	IN6_ARE_ADDR_EQUAL(&tmp->addr.in6.sin6_addr, local))
-      param->addr_match = 1;
+      match = param->addr_match = 1;
   
   /* Determine a globally address on the arrival interface, even
      if we have no matching dhcp-context, because we're only
@@ -405,16 +416,12 @@ static int complete_context6(struct in6_addr *local,  int prefix,
 	      }
 	  }      
       }
-
-  for (relay = daemon->relay6; relay; relay = relay->next)
-    if (IN6_ARE_ADDR_EQUAL(local, &relay->local.addr6) && relay->current == relay &&
-	(IN6_IS_ADDR_UNSPECIFIED(&param->relay_local) || IN6_ARE_ADDR_EQUAL(local, &param->relay_local)))
-      {
-	relay->current = param->relay;
-	param->relay = relay;
-	param->relay_local = *local;
-      }
-     
+  
+  if (match)
+    for (relay = daemon->relay6; relay; relay = relay->next)
+      if (IN6_ARE_ADDR_EQUAL(local, &relay->local.addr6))
+	relay->iface_index = if_index;
+  
   return 1;
 }
 

src/dns-protocol.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/dnsmasq.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -17,8 +17,13 @@
 /* Declare static char *compiler_opts  in config.h */
 #define DNSMASQ_COMPILE_OPTS
 
+/* dnsmasq.h has to be included first as it sources config.h */
 #include "dnsmasq.h"
 
+#if defined(HAVE_IDN) || defined(HAVE_LIBIDN2) || defined(LOCALEDIR)
+#include <locale.h>
+#endif
+
 struct daemon *daemon;
 
 static volatile pid_t pid = 0;
@@ -34,7 +39,6 @@ static void poll_resolv(int force, int do_reload, time_t now);
 
 int main (int argc, char **argv)
 {
-  int bind_fallback = 0;
   time_t now;
   struct sigaction sigact;
   struct iname *if_tmp;
@@ -59,6 +63,8 @@ int main (int argc, char **argv)
   int did_bind = 0;
   struct server *serv;
   char *netlink_warn;
+#else
+  int bind_fallback = 0;
 #endif 
 #if defined(HAVE_DHCP) || defined(HAVE_DHCP6)
   struct dhcp_context *context;
@@ -68,8 +74,10 @@ int main (int argc, char **argv)
   int tftp_prefix_missing = 0;
 #endif
 
-#ifdef LOCALEDIR
+#if defined(HAVE_IDN) || defined(HAVE_LIBIDN2) || defined(LOCALEDIR)
   setlocale(LC_ALL, "");
+#endif
+#ifdef LOCALEDIR
   bindtextdomain("dnsmasq", LOCALEDIR); 
   textdomain("dnsmasq");
 #endif
@@ -345,6 +353,16 @@ int main (int argc, char **argv)
     }
 #endif
 
+#ifdef HAVE_NFTSET
+  if (daemon->nftsets)
+    {
+      nftset_init();
+#  ifdef HAVE_LINUX_NETWORK
+      need_cap_net_admin = 1;
+#  endif
+    }
+#endif
+
 #if  defined(HAVE_LINUX_NETWORK)
   netlink_warn = netlink_init();
 #elif defined(HAVE_BSD_NETWORK)
@@ -369,28 +387,9 @@ int main (int argc, char **argv)
 #if defined(HAVE_LINUX_NETWORK) && defined(HAVE_DHCP)
       /* after enumerate_interfaces()  */
       bound_device = whichdevice();
-      
-      if (daemon->dhcp)
-	{
-	  if (!daemon->relay4 && bound_device)
-	    {
-	      bindtodevice(bound_device, daemon->dhcpfd);
-	      did_bind = 1;
-	    }
-	  if (daemon->enable_pxe && bound_device)
-	    {
-	      bindtodevice(bound_device, daemon->pxefd);
-	      did_bind = 1;
-	    }
-	}
-#endif
 
-#if defined(HAVE_LINUX_NETWORK) && defined(HAVE_DHCP6)
-      if (daemon->doing_dhcp6 && !daemon->relay6 && bound_device)
-	{
-	  bindtodevice(bound_device, daemon->dhcp6fd);
-	  did_bind = 1;
-	}
+      if ((did_bind = bind_dhcp_devices(bound_device)) & 2)
+	die(_("failed to set SO_BINDTODEVICE on DHCP socket: %s"), NULL, EC_BADNET);	
 #endif
     }
   else 
@@ -716,7 +715,11 @@ int main (int argc, char **argv)
    /* if we are to run scripts, we need to fork a helper before dropping root. */
   daemon->helperfd = -1;
 #ifdef HAVE_SCRIPT 
-  if ((daemon->dhcp || daemon->dhcp6 || option_bool(OPT_TFTP) || option_bool(OPT_SCRIPT_ARP)) && 
+  if ((daemon->dhcp ||
+       daemon->dhcp6 ||
+       daemon->relay6 ||
+       option_bool(OPT_TFTP) ||
+       option_bool(OPT_SCRIPT_ARP)) && 
       (daemon->lease_change_command || daemon->luascript))
       daemon->helperfd = create_helper(pipewrite, err_pipe[1], script_uid, script_gid, max_fd);
 #endif
@@ -920,8 +923,10 @@ int main (int argc, char **argv)
     my_syslog(LOG_WARNING, _("warning: failed to change owner of %s: %s"), 
 	      daemon->log_file, strerror(log_err));
   
+#ifndef HAVE_LINUX_NETWORK
   if (bind_fallback)
     my_syslog(LOG_WARNING, _("setting --bind-interfaces option because of OS limitations"));
+#endif
 
   if (option_bool(OPT_NOWILD))
     warn_bound_listeners();
@@ -1076,6 +1081,17 @@ int main (int argc, char **argv)
 #endif
       
 #ifdef HAVE_DHCP
+#  if defined(HAVE_LINUX_NETWORK)
+      if (bind_dhcp_devices(bound_device) & 2)
+	{
+	  static int warned = 0;
+	  if (!warned)
+	    {
+	      my_syslog(LOG_ERR, _("error binding DHCP socket to device %s"), bound_device);
+	      warned = 1;
+	    }
+	}
+# endif
       if (daemon->dhcp || daemon->relay4)
 	{
 	  poll_listen(daemon->dhcpfd, POLLIN);
@@ -1119,6 +1135,10 @@ int main (int argc, char **argv)
       while (helper_buf_empty() && do_tftp_script_run());
 #    endif
 
+#    ifdef HAVE_DHCP6
+      while (helper_buf_empty() && do_snoop_script_run());
+#    endif
+      
       if (!helper_buf_empty())
 	poll_listen(daemon->helperfd, POLLOUT);
 #else
@@ -1575,7 +1595,7 @@ static void async_event(int pipe, time_t now)
 	  {
 	    /* block in writes until all done */
 	    if ((i = fcntl(daemon->helperfd, F_GETFL)) != -1)
-	      fcntl(daemon->helperfd, F_SETFL, i & ~O_NONBLOCK); 
+	      while(retry_send(fcntl(daemon->helperfd, F_SETFL, i & ~O_NONBLOCK)));
 	    do {
 	      helper_write();
 	    } while (!helper_buf_empty() || do_script_run(now));
@@ -1669,6 +1689,11 @@ static void poll_resolv(int force, int do_reload, time_t now)
 	}
       else 
 	{
+	  /* If we're delaying things, we don't call check_servers(), but 
+	     reload_servers() may have deleted some servers, rendering the server_array
+	     invalid, so just rebuild that here. Once reload_servers() succeeds,
+	     we call check_servers() above, which calls build_server_array itself. */
+	  build_server_array();
 	  latest->mtime = 0;
 	  if (!warned)
 	    {
@@ -1984,7 +2009,7 @@ static void check_dns_listeners(time_t now)
 		 attribute from the listening socket. 
 		 Reset that here. */
 	      if ((flags = fcntl(confd, F_GETFL, 0)) != -1)
-		fcntl(confd, F_SETFL, flags & ~O_NONBLOCK);
+		while(retry_send(fcntl(confd, F_SETFL, flags & ~O_NONBLOCK)));
 	      
 	      buff = tcp_request(confd, now, &tcp_addr, netmask, auth_dns);
 	       

src/dnsmasq.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
  
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -14,7 +14,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#define COPYRIGHT "Copyright (c) 2000-2021 Simon Kelley"
+#define COPYRIGHT "Copyright (c) 2000-2022 Simon Kelley"
 
 /* We do defines that influence behavior of stdio.h, so complain
    if included too early. */
@@ -275,7 +275,11 @@ struct event_desc {
 #define OPT_UMBRELLA_DEVID 64
 #define OPT_CMARK_ALST_EN  65
 #define OPT_QUIET_TFTP     66
-#define OPT_LAST           67
+#define OPT_FILTER_A       67
+#define OPT_FILTER_AAAA    68
+#define OPT_STRIP_ECS      69
+#define OPT_STRIP_MAC      70
+#define OPT_LAST           71
 
 #define OPTION_BITS (sizeof(unsigned int)*8)
 #define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )
@@ -530,23 +534,23 @@ union mysockaddr {
 
 
 /* The actual values here matter, since we sort on them to get records in the order
-   IPv6 addr, IPv4 addr, all zero return, no-data return, send upstream. */
-#define SERV_LITERAL_ADDRESS   1  /* addr is the answer, or NoDATA is the answer, depending on the next three flags */
-#define SERV_ALL_ZEROS         2  /* return all zeros for A and AAAA */
-#define SERV_4ADDR             4  /* addr is IPv4 */
-#define SERV_6ADDR             8  /* addr is IPv6 */
-#define SERV_HAS_SOURCE       16  /* source address defined */
-#define SERV_FOR_NODOTS       32  /* server for names with no domain part only */
-#define SERV_WARNED_RECURSIVE 64  /* avoid warning spam */
-#define SERV_FROM_DBUS       128  /* 1 if source is DBus */
-#define SERV_MARK            256  /* for mark-and-delete and log code */
-#define SERV_WILDCARD        512  /* domain has leading '*' */ 
-#define SERV_USE_RESOLV     1024  /* forward this domain in the normal way */
-#define SERV_FROM_RESOLV    2048  /* 1 for servers from resolv, 0 for command line. */
-#define SERV_FROM_FILE      4096  /* read from --servers-file */
-#define SERV_LOOP           8192  /* server causes forwarding loop */
-#define SERV_DO_DNSSEC     16384  /* Validate DNSSEC when using this server */
-#define SERV_GOT_TCP       32768  /* Got some data from the TCP connection */
+   IPv6 addr, IPv4 addr, all zero return, resolvconf servers, upstream server, no-data return  */
+#define SERV_LITERAL_ADDRESS    1  /* addr is the answer, or NoDATA is the answer, depending on the next four flags */
+#define SERV_USE_RESOLV         2  /* forward this domain in the normal way */
+#define SERV_ALL_ZEROS          4  /* return all zeros for A and AAAA */
+#define SERV_4ADDR              8  /* addr is IPv4 */
+#define SERV_6ADDR             16  /* addr is IPv6 */
+#define SERV_HAS_SOURCE        32  /* source address defined */
+#define SERV_FOR_NODOTS        64  /* server for names with no domain part only */
+#define SERV_WARNED_RECURSIVE 128  /* avoid warning spam */
+#define SERV_FROM_DBUS        256  /* 1 if source is DBus */
+#define SERV_MARK             512  /* for mark-and-delete and log code */
+#define SERV_WILDCARD        1024  /* domain has leading '*' */ 
+#define SERV_FROM_RESOLV     2048  /* 1 for servers from resolv, 0 for command line. */
+#define SERV_FROM_FILE       4096  /* read from --servers-file */
+#define SERV_LOOP            8192  /* server causes forwarding loop */
+#define SERV_DO_DNSSEC      16384  /* Validate DNSSEC when using this server */
+#define SERV_GOT_TCP        32768  /* Got some data from the TCP connection */
 
 struct serverfd {
   int fd;
@@ -609,6 +613,11 @@ struct serv_local {
   struct server *next;
 };
 
+struct rebind_domain {
+  char *domain;
+  struct rebind_domain *next;
+};
+
 struct ipsets {
   char **sets;
   char *domain;
@@ -681,14 +690,18 @@ struct hostsfile {
 };
 
 /* packet-dump flags */
-#define DUMP_QUERY     0x0001
-#define DUMP_REPLY     0x0002
-#define DUMP_UP_QUERY  0x0004
-#define DUMP_UP_REPLY  0x0008
-#define DUMP_SEC_QUERY 0x0010
-#define DUMP_SEC_REPLY 0x0020
-#define DUMP_BOGUS     0x0040
-#define DUMP_SEC_BOGUS 0x0080
+#define DUMP_QUERY         0x0001
+#define DUMP_REPLY         0x0002
+#define DUMP_UP_QUERY      0x0004 
+#define DUMP_UP_REPLY      0x0008
+#define DUMP_SEC_QUERY     0x0010
+#define DUMP_SEC_REPLY     0x0020
+#define DUMP_BOGUS         0x0040 
+#define DUMP_SEC_BOGUS     0x0080
+#define DUMP_DHCP          0x1000
+#define DUMP_DHCPV6        0x2000
+#define DUMP_RA            0x4000
+#define DUMP_TFTP          0x8000
 
 /* DNSSEC status values. */
 #define STAT_SECURE             0x10000
@@ -715,7 +728,7 @@ struct hostsfile {
 
 #define FREC_NOREBIND           1
 #define FREC_CHECKING_DISABLED  2
-#define FREC_HAS_SUBNET         4
+#define FREC_NO_CACHE           4
 #define FREC_DNSKEY_QUERY       8
 #define FREC_DS_QUERY          16
 #define FREC_AD_QUESTION       32
@@ -724,7 +737,6 @@ struct hostsfile {
 #define FREC_TEST_PKTSZ       256
 #define FREC_HAS_EXTRADATA    512
 #define FREC_HAS_PHEADER     1024
-#define FREC_NO_CACHE        2048
 
 #define HASH_SIZE 32 /* SHA-256 digest size */
 
@@ -771,6 +783,7 @@ struct frec {
 #define ACTION_TFTP          5
 #define ACTION_ARP           6
 #define ACTION_ARP_DEL       7
+#define ACTION_RELAY_SNOOP   8
 
 #define LEASE_NEW            1  /* newly created */
 #define LEASE_CHANGED        2  /* modified */
@@ -1069,7 +1082,14 @@ struct dhcp_relay {
   union all_addr local, server;
   char *interface; /* Allowable interface for replies from server, and dest for IPv6 multicast */
   int iface_index; /* working - interface in which requests arrived, for return */
-  struct dhcp_relay *current, *next;
+#ifdef HAVE_SCRIPT
+  struct snoop_record {
+    struct in6_addr client, prefix;
+    int prefix_len;
+    struct snoop_record *next;
+  } *snoop_records;
+#endif
+  struct dhcp_relay *next;
 };
 
 extern struct daemon {
@@ -1105,10 +1125,11 @@ extern struct daemon {
   char *lease_change_command;
   struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers, *tftp_interfaces;
   struct bogus_addr *bogus_addr, *ignore_addr;
-  struct server *servers, *local_domains, **serverarray, *no_rebind;
+  struct server *servers, *servers_tail, *local_domains, **serverarray;
+  struct rebind_domain *no_rebind;
   int server_has_wildcard;
   int serverarraysz, serverarrayhwm;
-  struct ipsets *ipsets;
+  struct ipsets *ipsets, *nftsets;
   u32 allowlist_mask;
   struct allowlist *allowlists;
   int log_fac; /* log facility */
@@ -1167,9 +1188,12 @@ extern struct daemon {
   char *packet; /* packet buffer */
   int packet_buff_sz; /* size of above */
   char *namebuff; /* MAXDNAME size buffer */
+#if (defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)) || defined(HAVE_DNSSEC)
+  /* CONNTRACK UBUS code uses this buffer, as well as DNSSEC code. */
+  char *workspacename;
+#endif
 #ifdef HAVE_DNSSEC
   char *keyname; /* MAXDNAME size buffer */
-  char *workspacename; /* ditto */
   unsigned long *rr_status; /* ceiling in TTL from DNSSEC or zero for insecure */
   int rr_status_sz;
   int dnssec_no_time_check;
@@ -1216,13 +1240,18 @@ extern struct daemon {
   unsigned char *duid;
   struct iovec outpacket;
   int dhcp6fd, icmp6fd;
+#  ifdef HAVE_SCRIPT
+  struct snoop_record *free_snoops;
+#  endif
 #endif
+  
   /* DBus stuff */
   /* void * here to avoid depending on dbus headers outside dbus.c */
   void *dbus;
 #ifdef HAVE_DBUS
   struct watch *watches;
 #endif
+
   /* UBus stuff */
 #ifdef HAVE_UBUS
   /* void * here to avoid depending on ubus headers outside ubus.c */
@@ -1245,9 +1274,8 @@ extern struct daemon {
 /* cache.c */
 void cache_init(void);
 void next_uid(struct crec *crecp);
-void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg); 
+void log_query(unsigned int flags, char *name, union all_addr *addr, char *arg, unsigned short type); 
 char *record_source(unsigned int index);
-char *querystr(char *desc, unsigned short type);
 int cache_find_non_terminal(char *name, time_t now);
 struct crec *cache_find_by_addr(struct crec *crecp,
 				union all_addr *addr, time_t now, 
@@ -1298,8 +1326,8 @@ unsigned int extract_request(struct dns_header *header, size_t qlen,
 			       char *name, unsigned short *typep);
 void setup_reply(struct dns_header *header, unsigned int flags, int ede);
 int extract_addresses(struct dns_header *header, size_t qlen, char *name,
-		      time_t now, char **ipsets, int is_sign, int check_rebind,
-		      int no_cache_dnssec, int secure, int *doctored);
+		      time_t now, struct ipsets *ipsets, struct ipsets *nftsets, int is_sign,
+                      int check_rebind, int no_cache_dnssec, int secure, int *doctored);
 #if defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)
 void report_addresses(struct dns_header *header, size_t len, u32 mark);
 #endif
@@ -1366,6 +1394,7 @@ void safe_pipe(int *fd, int read_noblock);
 void *whine_malloc(size_t size);
 int sa_len(union mysockaddr *addr);
 int sockaddr_isequal(const union mysockaddr *s1, const union mysockaddr *s2);
+int hostname_order(const char *a, const char *b);
 int hostname_isequal(const char *a, const char *b);
 int hostname_issubdomain(char *a, char *b);
 time_t dnsmasq_time(void);
@@ -1583,6 +1612,12 @@ void ipset_init(void);
 int add_to_ipset(const char *setname, const union all_addr *ipaddr, int flags, int remove);
 #endif
 
+/* nftset.c */
+#ifdef HAVE_NFTSET
+void nftset_init(void);
+int add_to_nftset(const char *setpath, const union all_addr *ipaddr, int flags, int remove);
+#endif
+
 /* pattern.c */
 #ifdef HAVE_CONNTRACK
 int is_valid_dns_name(const char *value);
@@ -1602,6 +1637,9 @@ void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
 void queue_arp(int action, unsigned char *mac, int maclen,
 	       int family, union all_addr *addr);
 int helper_buf_empty(void);
+#ifdef HAVE_DHCP6
+void queue_relay_snoop(struct in6_addr *client, int if_index, struct in6_addr *prefix, int prefix_len);
+#endif
 #endif
 
 /* tftp.c */
@@ -1644,10 +1682,13 @@ void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac,
 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name,  
 			   struct in6_addr *fallback, struct in6_addr *ll_addr, struct in6_addr *ula_addr,
 			   size_t sz, struct in6_addr *client_addr, time_t now);
-void relay_upstream6(struct dhcp_relay *relay, ssize_t sz, struct in6_addr *peer_address, 
+int relay_upstream6(int iface_index, ssize_t sz, struct in6_addr *peer_address, 
 		     u32 scope_id, time_t now);
 
-unsigned short relay_reply6( struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface);
+int relay_reply6( struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface);
+#  ifdef HAVE_SCRIPT
+int do_snoop_script_run(void);
+#  endif
 #endif
 
 /* dhcp-common.c */
@@ -1674,7 +1715,7 @@ struct dhcp_config *find_config(struct dhcp_config *configs,
 int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type);
 #ifdef HAVE_LINUX_NETWORK
 char *whichdevice(void);
-void bindtodevice(char *device, int fd);
+int bind_dhcp_devices(char *bound_device);
 #endif
 #  ifdef HAVE_DHCP6
 void display_opts6(void);
@@ -1735,7 +1776,11 @@ int do_poll(int timeout);
 size_t rrfilter(struct dns_header *header, size_t plen, int mode);
 u16 *rrfilter_desc(int type);
 int expand_workspace(unsigned char ***wkspc, int *szp, int new);
-
+/* modes. */
+#define RRFILTER_EDNS0   0
+#define RRFILTER_DNSSEC  1
+#define RRFILTER_A       2
+#define RRFILTER_AAAA    3
 /* edns0.c */
 unsigned char *find_pseudoheader(struct dns_header *header, size_t plen,
 				   size_t *len, unsigned char **p, int *is_sign, int *is_last);
@@ -1743,7 +1788,7 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
 			unsigned short udp_sz, int optno, unsigned char *opt, size_t optlen, int set_do, int replace);
 size_t add_do_bit(struct dns_header *header, size_t plen, unsigned char *limit);
 size_t add_edns0_config(struct dns_header *header, size_t plen, unsigned char *limit, 
-			union mysockaddr *source, time_t now, int *check_subnet, int *cacheable);
+			union mysockaddr *source, time_t now, int *cacheable);
 int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer);
 
 /* arp.c */
@@ -1753,7 +1798,8 @@ int do_arp_script_run(void);
 /* dump.c */
 #ifdef HAVE_DUMPFILE
 void dump_init(void);
-void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, union mysockaddr *dst);
+void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src,
+		 union mysockaddr *dst, int port);
 #endif
 
 /* domain-match.c */

src/dnssec.c

@@ -724,7 +724,8 @@ static int validate_rrset(time_t now, struct dns_header *header, size_t plen, in
       
       /* namebuff used for workspace above, restore to leave unchanged on exit */
       p = (unsigned char*)(rrset[0]);
-      extract_name(header, plen, &p, name, 1, 0);
+      if (!extract_name(header, plen, &p, name, 1, 0))
+	return STAT_BOGUS;
 
       if (key)
 	{
@@ -954,9 +955,9 @@ int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t plen, ch
 			  a.log.keytag = keytag;
 			  a.log.algo = algo;
 			  if (algo_digest_name(algo))
-			    log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DNSKEY keytag %hu, algo %hu");
+			    log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DNSKEY keytag %hu, algo %hu", 0);
 			  else
-			    log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DNSKEY keytag %hu, algo %hu (not supported)");
+			    log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DNSKEY keytag %hu, algo %hu (not supported)", 0);
 			}
 		    }
 		}
@@ -973,7 +974,7 @@ int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t plen, ch
       return STAT_OK;
     }
 
-  log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, "BOGUS DNSKEY");
+  log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, "BOGUS DNSKEY", 0);
   return STAT_BOGUS | failflags;
 }
 
@@ -1012,12 +1013,14 @@ int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char
   if (STAT_ISEQUAL(rc, STAT_INSECURE))
     {
       my_syslog(LOG_WARNING, _("Insecure DS reply received for %s, check domain configuration and upstream DNS server DNSSEC support"), name);
-      log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, "BOGUS DS - not secure");
+      log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, "BOGUS DS - not secure", 0);
       return STAT_BOGUS | DNSSEC_FAIL_INDET;
     }
   
   p = (unsigned char *)(header+1);
-  extract_name(header, plen, &p, name, 1, 4);
+  if (!extract_name(header, plen, &p, name, 1, 4))
+      return STAT_BOGUS;
+
   p += 4; /* qtype, qclass */
   
   /* If the key needed to validate the DS is on the same domain as the DS, we'll
@@ -1025,7 +1028,7 @@ int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char
      from the DS's zone, and not the parent zone. */
   if (STAT_ISEQUAL(rc, STAT_NEED_KEY) && hostname_isequal(name, keyname))
     {
-      log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, "BOGUS DS");
+      log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, "BOGUS DS", 0);
       return STAT_BOGUS;
     }
   
@@ -1081,9 +1084,9 @@ int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char
 		      a.log.algo = algo;
 		      a.log.digest = digest;
 		      if (ds_digest_name(digest) && algo_digest_name(algo))
-			log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DS keytag %hu, algo %hu, digest %hu");
+			log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DS keytag %hu, algo %hu, digest %hu", 0);
 		      else
-			log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DS keytag %hu, algo %hu, digest %hu (not supported)");
+			log_query(F_NOEXTRA | F_KEYTAG | F_UPSTREAM, name, &a, "DS keytag %hu, algo %hu, digest %hu (not supported)", 0);
 		    } 
 		}
 	      
@@ -1116,7 +1119,7 @@ int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char
       
       cache_end_insert();  
       
-      log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, nons ? "no DS/cut" : "no DS");
+      log_query(F_NOEXTRA | F_UPSTREAM, name, NULL, nons ? "no DS/cut" : "no DS", 0);
     }
       
   return STAT_OK;
@@ -1864,7 +1867,7 @@ int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, ch
   int type1, class1, rdlen1 = 0, type2, class2, rdlen2, qclass, qtype, targetidx;
   int i, j, rc = STAT_INSECURE;
   int secure = STAT_SECURE;
-
+   
   /* extend rr_status if necessary */
   if (daemon->rr_status_sz < ntohs(header->ancount) + ntohs(header->nscount))
     {
@@ -1986,7 +1989,7 @@ int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, ch
 	    {
 	      /* NSEC and NSEC3 records must be signed. We make this assumption elsewhere. */
 	      if (type1 == T_NSEC || type1 == T_NSEC3)
-		rc = STAT_INSECURE;
+		return STAT_BOGUS | DNSSEC_FAIL_NOSIG;
 	      else if (nons && i >= ntohs(header->ancount))
 		/* If we're validating a DS reply, rather than looking for the value of AD bit,
 		   we only care that NSEC and NSEC3 RRs in the auth section are signed. 
@@ -2000,6 +2003,7 @@ int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, ch
 		      rc = zone_status(name, class1, keyname, now);
 		      if (STAT_ISEQUAL(rc, STAT_SECURE))
 			rc = STAT_BOGUS | DNSSEC_FAIL_NOSIG;
+		      
 		      if (class)
 			*class = class1; /* Class for NEED_DS or NEED_KEY */
 		    }
@@ -2078,36 +2082,35 @@ int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, ch
     }
 
   /* OK, all the RRsets validate, now see if we have a missing answer or CNAME target. */
-  if (STAT_ISEQUAL(secure, STAT_SECURE))
-    for (j = 0; j <targetidx; j++)
-      if ((p2 = targets[j]))
-	{
-	  if (neganswer)
-	    *neganswer = 1;
-	  
-	  if (!extract_name(header, plen, &p2, name, 1, 10))
-	    return STAT_BOGUS; /* bad packet */
-	  
-	  /* NXDOMAIN or NODATA reply, unanswered question is (name, qclass, qtype) */
-	  
-	  /* For anything other than a DS record, this situation is OK if either
-	     the answer is in an unsigned zone, or there's a NSEC records. */
-	  if (!prove_non_existence(header, plen, keyname, name, qtype, qclass, NULL, nons, nsec_ttl))
-	    {
-	      /* Empty DS without NSECS */
-	      if (qtype == T_DS)
-		return STAT_BOGUS | DNSSEC_FAIL_NONSEC;
-	      
-	      if (STAT_ISEQUAL((rc = zone_status(name, qclass, keyname, now)), STAT_SECURE))
-		{
-		  if (class)
-		    *class = qclass; /* Class for NEED_DS or NEED_KEY */
-		  return rc;
-		} 
-	      
-	      return STAT_BOGUS | DNSSEC_FAIL_NONSEC; /* signed zone, no NSECs */
-	    }
-	}
+  for (j = 0; j <targetidx; j++)
+    if ((p2 = targets[j]))
+      {
+	if (neganswer)
+	  *neganswer = 1;
+	
+	if (!extract_name(header, plen, &p2, name, 1, 10))
+	  return STAT_BOGUS; /* bad packet */
+	
+	/* NXDOMAIN or NODATA reply, unanswered question is (name, qclass, qtype) */
+	
+	/* For anything other than a DS record, this situation is OK if either
+	   the answer is in an unsigned zone, or there's a NSEC records. */
+	if (!prove_non_existence(header, plen, keyname, name, qtype, qclass, NULL, nons, nsec_ttl))
+	  {
+	    /* Empty DS without NSECS */
+	    if (qtype == T_DS)
+	      return STAT_BOGUS | DNSSEC_FAIL_NONSEC;
+	    
+	    if (!STAT_ISEQUAL((rc = zone_status(name, qclass, keyname, now)), STAT_SECURE))
+	      {
+		if (class)
+		  *class = qclass; /* Class for NEED_DS or NEED_KEY */
+		return rc;
+	      } 
+	    
+	    return STAT_BOGUS | DNSSEC_FAIL_NONSEC; /* signed zone, no NSECs */
+	  }
+      }
   
   return secure;
 }

src/domain-match.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -207,16 +207,16 @@ int lookup_domain(char *domain, int flags, int *lowout, int *highout)
 		}
 	    }
 	  
-	  if (found)
+	  if (found && filter_servers(try, flags, &nlow, &nhigh))
+	    /* We have a match, but it may only be (say) an IPv6 address, and
+	       if the query wasn't for an AAAA record, it's no good, and we need
+	       to continue generalising */
 	    {
 	      /* We've matched a setting which says to use servers without a domain.
 		 Continue the search with empty query */
-	      if (daemon->serverarray[try]->flags & SERV_USE_RESOLV)
+	      if (daemon->serverarray[nlow]->flags & SERV_USE_RESOLV)
 		crop_query = qlen;
-	      else if (filter_servers(try, flags, &nlow, &nhigh))
-		/* We have a match, but it may only be (say) an IPv6 address, and
-		   if the query wasn't for an AAAA record, it's no good, and we need
-		   to continue generalising */
+	      else
 		break;
 	    }
 	}
@@ -273,7 +273,7 @@ int filter_servers(int seed, int flags, int *lowout, int *highout)
     nlow--;
   
   while (nhigh < daemon->serverarraysz-1 && order_servers(daemon->serverarray[nhigh], daemon->serverarray[nhigh+1]) == 0)
-	nhigh++;
+    nhigh++;
   
   nhigh++;
   
@@ -293,10 +293,10 @@ int filter_servers(int seed, int flags, int *lowout, int *highout)
   else
     {
       /* Now the servers are on order between low and high, in the order
-	 IPv6 addr, IPv4 addr, return zero for both, send upstream, no-data return.
+	 IPv6 addr, IPv4 addr, return zero for both, resolvconf servers, send upstream, no-data return.
 	 
 	 See which of those match our query in that priority order and narrow (low, high) */
-
+      
       for (i = nlow; i < nhigh && (daemon->serverarray[i]->flags & SERV_6ADDR); i++);
       
       if (i != nlow && (flags & F_IPV6))
@@ -321,32 +321,40 @@ int filter_servers(int seed, int flags, int *lowout, int *highout)
 		{
 		  nlow = i;
 		  
-		  /* now look for a server */
-		  for (i = nlow; i < nhigh && !(daemon->serverarray[i]->flags & SERV_LITERAL_ADDRESS); i++);
-
+		  /* Short to resolv.conf servers */
+		  for (i = nlow; i < nhigh && (daemon->serverarray[i]->flags & SERV_USE_RESOLV); i++);
+		  
 		  if (i != nlow)
-		    {
-		      /* If we want a server that can do DNSSEC, and this one can't, 
-			 return nothing, similarly if were looking only for a server
-			 for a particular domain. */
-		      if ((flags & F_DNSSECOK) && !(daemon->serverarray[nlow]->flags & SERV_DO_DNSSEC))
-			nlow = nhigh;
-		      else if ((flags & F_DOMAINSRV) && daemon->serverarray[nlow]->domain_len == 0)
-			nlow = nhigh;
-		      else
-			nhigh = i;
-		    }
+		    nhigh = i;
 		  else
 		    {
-		      /* --local=/domain/, only return if we don't need a server. */
-		      if (flags & (F_DNSSECOK | F_DOMAINSRV | F_SERVER))
-			nhigh = i;
+		      /* now look for a server */
+		      for (i = nlow; i < nhigh && !(daemon->serverarray[i]->flags & SERV_LITERAL_ADDRESS); i++);
+		      
+		      if (i != nlow)
+			{
+			  /* If we want a server that can do DNSSEC, and this one can't, 
+			     return nothing, similarly if were looking only for a server
+			     for a particular domain. */
+			  if ((flags & F_DNSSECOK) && !(daemon->serverarray[nlow]->flags & SERV_DO_DNSSEC))
+			    nlow = nhigh;
+			  else if ((flags & F_DOMAINSRV) && daemon->serverarray[nlow]->domain_len == 0)
+			    nlow = nhigh;
+			  else
+			    nhigh = i;
+			}
+		      else
+			{
+			  /* --local=/domain/, only return if we don't need a server. */
+			  if (flags & (F_DNSSECOK | F_DOMAINSRV | F_SERVER))
+			    nhigh = i;
+			}
 		    }
 		}
 	    }
 	}
     }
-  
+
   *lowout = nlow;
   *highout = nhigh;
   
@@ -387,13 +395,13 @@ int is_local_answer(time_t now, int first, char *name)
 
 size_t make_local_answer(int flags, int gotname, size_t size, struct dns_header *header, char *name, char *limit, int first, int last, int ede)
 {
-  int trunc = 0;
+  int trunc = 0, anscount = 0;
   unsigned char *p;
   int start;
   union all_addr addr;
   
   if (flags & (F_NXDOMAIN | F_NOERR))
-    log_query(flags | gotname | F_NEG | F_CONFIG | F_FORWARD, name, NULL, NULL);
+    log_query(flags | gotname | F_NEG | F_CONFIG | F_FORWARD, name, NULL, NULL, 0);
 	  
   setup_reply(header, flags, ede);
 	  
@@ -410,9 +418,9 @@ size_t make_local_answer(int flags, int gotname, size_t size, struct dns_header
 	else
 	  addr.addr4 = srv->addr;
 	
-	header->ancount = htons(ntohs(header->ancount) + 1);
-	add_resource_record(header, limit, &trunc, sizeof(struct dns_header), &p, daemon->local_ttl, NULL, T_A, C_IN, "4", &addr);
-	log_query((flags | F_CONFIG | F_FORWARD) & ~F_IPV6, name, (union all_addr *)&addr, NULL);
+	if (add_resource_record(header, limit, &trunc, sizeof(struct dns_header), &p, daemon->local_ttl, NULL, T_A, C_IN, "4", &addr))
+	  anscount++;
+	log_query((flags | F_CONFIG | F_FORWARD) & ~F_IPV6, name, (union all_addr *)&addr, NULL, 0);
       }
   
   if (flags & gotname & F_IPV6)
@@ -425,14 +433,15 @@ size_t make_local_answer(int flags, int gotname, size_t size, struct dns_header
 	else
 	  addr.addr6 = srv->addr;
 	
-	header->ancount = htons(ntohs(header->ancount) + 1);
-	add_resource_record(header, limit, &trunc, sizeof(struct dns_header), &p, daemon->local_ttl, NULL, T_AAAA, C_IN, "6", &addr);
-	log_query((flags | F_CONFIG | F_FORWARD) & ~F_IPV4, name, (union all_addr *)&addr, NULL);
+	if (add_resource_record(header, limit, &trunc, sizeof(struct dns_header), &p, daemon->local_ttl, NULL, T_AAAA, C_IN, "6", &addr))
+	  anscount++;
+	log_query((flags | F_CONFIG | F_FORWARD) & ~F_IPV4, name, (union all_addr *)&addr, NULL, 0);
       }
 
   if (trunc)
     header->hb3 |= HB3_TC;
-
+  header->ancount = htons(anscount);
+  
   return p - (unsigned char *)header;
 }
 
@@ -485,7 +494,7 @@ static int order(char *qdomain, size_t qlen, struct server *serv)
   if (qlen > dlen)
     return -1;
 
-  return strcmp(qdomain, serv->domain);
+  return hostname_order(qdomain, serv->domain);
 }
 
 static int order_servers(struct server *s1, struct server *s2)
@@ -520,10 +529,10 @@ static int order_qsort(const void *a, const void *b)
   /* Sort all literal NODATA and local IPV4 or IPV6 responses together,
      in a very specific order. We flip the SERV_LITERAL_ADDRESS bit
      so the order is IPv6 literal, IPv4 literal, all-zero literal, 
-     upstream server, NXDOMAIN literal. */
+     unqualified servers, upstream server, NXDOMAIN literal. */
   if (rc == 0)
-    rc = ((s2->flags & (SERV_LITERAL_ADDRESS | SERV_4ADDR | SERV_6ADDR | SERV_ALL_ZEROS)) ^ SERV_LITERAL_ADDRESS) -
-      ((s1->flags & (SERV_LITERAL_ADDRESS | SERV_4ADDR | SERV_6ADDR | SERV_ALL_ZEROS)) ^ SERV_LITERAL_ADDRESS);
+    rc = ((s2->flags & (SERV_LITERAL_ADDRESS | SERV_4ADDR | SERV_6ADDR | SERV_USE_RESOLV | SERV_ALL_ZEROS)) ^ SERV_LITERAL_ADDRESS) -
+      ((s1->flags & (SERV_LITERAL_ADDRESS | SERV_4ADDR | SERV_6ADDR | SERV_USE_RESOLV | SERV_ALL_ZEROS)) ^ SERV_LITERAL_ADDRESS);
 
   /* Finally, order by appearance in /etc/resolv.conf etc, for --strict-order */
   if (rc == 0)
@@ -533,22 +542,39 @@ static int order_qsort(const void *a, const void *b)
   return rc;
 }
 
+/* Must be called before  add_update_server() to set daemon->servers_tail */
 void mark_servers(int flag)
 {
-  struct server *serv;
+  struct server *serv, **up;
 
+  daemon->servers_tail = NULL;
+  
   /* mark everything with argument flag */
   for (serv = daemon->servers; serv; serv = serv->next)
-    if (serv->flags & flag)
-      serv->flags |= SERV_MARK;
-    else
-      serv->flags &= ~SERV_MARK;
+    {
+      if (serv->flags & flag)
+	serv->flags |= SERV_MARK;
+      else
+	serv->flags &= ~SERV_MARK;
 
-  for (serv = daemon->local_domains; serv; serv = serv->next)
-    if (serv->flags & flag)
-      serv->flags |= SERV_MARK;
-    else
-      serv->flags &= ~SERV_MARK;
+      daemon->servers_tail = serv;
+    }
+  
+  /* --address etc is different: since they are expected to be 
+     1) numerous and 2) not reloaded often. We just delete 
+     and recreate. */
+  if (flag)
+    for (serv = daemon->local_domains, up = &daemon->local_domains; serv; serv = serv->next)
+      {
+	if (serv->flags & flag)
+	  {
+	    *up = serv->next;
+	    free(serv->domain);
+	    free(serv);
+	  }
+	else 
+	  up = &serv->next;
+      }
 }
 
 void cleanup_servers(void)
@@ -556,7 +582,7 @@ void cleanup_servers(void)
   struct server *serv, *tmp, **up;
 
   /* unlink and free anything still marked. */
-  for (serv = daemon->servers, up = &daemon->servers; serv; serv = tmp) 
+  for (serv = daemon->servers, up = &daemon->servers, daemon->servers_tail = NULL; serv; serv = tmp) 
     {
       tmp = serv->next;
       if (serv->flags & SERV_MARK)
@@ -567,21 +593,11 @@ void cleanup_servers(void)
 	 free(serv);
        }
       else 
-       up = &serv->next;
+	{
+	  up = &serv->next;
+	  daemon->servers_tail = serv;
+	}
     }
-  
- for (serv = daemon->local_domains, up = &daemon->local_domains; serv; serv = tmp) 
-   {
-     tmp = serv->next;
-      if (serv->flags & SERV_MARK)
-       {
-	 *up = serv->next;
-	 free(serv->domain);
-	 free(serv);
-       }
-      else 
-	up = &serv->next;
-   }
 }
 
 int add_update_server(int flags,
@@ -609,82 +625,90 @@ int add_update_server(int flags,
   
   if (*domain == 0)
     alloc_domain = whine_malloc(1);
-  else if (!(alloc_domain = canonicalise((char *)domain, NULL)))
-    return 0;
-  
-  /* See if there is a suitable candidate, and unmark
-     only do this for forwarding servers, not 
-     address or local, to avoid delays on large numbers. */
-  if (flags & SERV_IS_LOCAL)
-    for (serv = daemon->servers; serv; serv = serv->next)
-      if ((serv->flags & SERV_MARK) &&
-	  hostname_isequal(alloc_domain, serv->domain))
-	break;
-  
-  if (serv)
-    {
-      free(alloc_domain);
-      alloc_domain = serv->domain;
-    }
   else
+    alloc_domain = canonicalise((char *)domain, NULL);
+
+  if (!alloc_domain)
+    return 0;
+
+  if (flags & SERV_IS_LOCAL)
     {
       size_t size;
-
-      if (flags & SERV_LITERAL_ADDRESS)
-	{
-	  if (flags & SERV_6ADDR)
-	    size = sizeof(struct serv_addr6);
-	  else if (flags & SERV_4ADDR)
-	    size = sizeof(struct serv_addr4);
-	  else
-	    size = sizeof(struct serv_local);
-	}
+      
+      if (flags & SERV_6ADDR)
+	size = sizeof(struct serv_addr6);
+      else if (flags & SERV_4ADDR)
+	size = sizeof(struct serv_addr4);
       else
-	size = sizeof(struct server);
+	size = sizeof(struct serv_local);
       
       if (!(serv = whine_malloc(size)))
-	return 0;
-      
-      if (flags & SERV_IS_LOCAL)
 	{
-	  serv->next = daemon->local_domains;
-	  daemon->local_domains = serv;
+	  free(alloc_domain);
+	  return 0;
+	}
+      
+      serv->next = daemon->local_domains;
+      daemon->local_domains = serv;
+      
+      if (flags & SERV_4ADDR)
+	((struct serv_addr4*)serv)->addr = local_addr->addr4;
+      
+      if (flags & SERV_6ADDR)
+	((struct serv_addr6*)serv)->addr = local_addr->addr6;
+    }
+  else
+    { 
+      /* Upstream servers. See if there is a suitable candidate, if so unmark
+	 and move to the end of the list, for order. The entry found may already
+	 be at the end. */
+      struct server **up, *tmp;
+      
+      for (serv = daemon->servers, up = &daemon->servers; serv; serv = tmp)
+	{
+	  tmp = serv->next;
+	  if ((serv->flags & SERV_MARK) &&
+	      hostname_isequal(alloc_domain, serv->domain))
+	    {
+	      /* Need to move down? */
+	      if (serv->next)
+		{
+		  *up = serv->next;
+		  daemon->servers_tail->next = serv;
+		  daemon->servers_tail = serv;
+		  serv->next = NULL;
+		}
+	      break;
+	    }	
+	}
+
+      if (serv)
+	{
+	  free(alloc_domain);
+	  alloc_domain = serv->domain;
 	}
       else
 	{
-	  struct server *s;
-	  /* Add to the end of the chain, for order */
-	  if (!daemon->servers)
-	    daemon->servers = serv;
-	  else
+	  if (!(serv = whine_malloc(sizeof(struct server))))
 	    {
-	      for (s = daemon->servers; s->next; s = s->next);
-	      s->next = serv;
+	      free(alloc_domain);
+	      return 0;
 	    }
 	  
-	  serv->next = NULL;
+	  memset(serv, 0, sizeof(struct server));
+	  
+	  /* Add to the end of the chain, for order */
+	  if (daemon->servers_tail)
+	    daemon->servers_tail->next = serv;
+	  else
+	    daemon->servers = serv;
+	  daemon->servers_tail = serv;
 	}
-    }
-  
-  if (!(flags & SERV_IS_LOCAL))
-    memset(serv, 0, sizeof(struct server));
-  
-  serv->flags = flags;
-  serv->domain = alloc_domain;
-  serv->domain_len = strlen(alloc_domain);
-  
-  if (flags & SERV_4ADDR)
-    ((struct serv_addr4*)serv)->addr = local_addr->addr4;
-
-  if (flags & SERV_6ADDR)
-    ((struct serv_addr6*)serv)->addr = local_addr->addr6;
-  
-  if (!(flags & SERV_IS_LOCAL))
-    {
+      
 #ifdef HAVE_LOOP
       serv->uid = rand32();
 #endif      
-      
+	  
       if (interface)
 	safe_strncpy(serv->interface, interface, sizeof(serv->interface));
       if (addr)
@@ -692,7 +716,11 @@ int add_update_server(int flags,
       if (source_addr)
 	serv->source_addr = *source_addr;
     }
-
+    
+  serv->flags = flags;
+  serv->domain = alloc_domain;
+  serv->domain_len = strlen(alloc_domain);
+  
   return 1;
 }
 

src/domain.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/dump.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -18,6 +18,8 @@
 
 #ifdef HAVE_DUMPFILE
 
+#include <netinet/icmp6.h>
+
 static u32 packet_count;
 
 /* https://wiki.wireshark.org/Development/LibpcapFileFormat */
@@ -79,7 +81,9 @@ void dump_init(void)
     }
 }
 
-void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, union mysockaddr *dst)
+/* port == -1 ->ICMPv6 */
+void dump_packet(int mask, void *packet, size_t len,
+		 union mysockaddr *src, union mysockaddr *dst, int port)
 {
   struct ip ip;
   struct ip6_hdr ip6;
@@ -101,7 +105,7 @@ void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, unio
     return;
   
   /* So wireshark can Id the packet. */
-  udp.uh_sport = udp.uh_dport = htons(NAMESERVER_PORT);
+  udp.uh_sport = udp.uh_dport = htons(port);
 
   if (src)
     family = src->sa.sa_family;
@@ -115,10 +119,19 @@ void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, unio
       memset(&ip6, 0, sizeof(ip6));
       
       ip6.ip6_vfc = 6 << 4;
-      ip6.ip6_plen = htons(sizeof(struct udphdr) + len);
-      ip6.ip6_nxt = IPPROTO_UDP;
       ip6.ip6_hops = 64;
 
+      if (port == -1)
+	{
+	  ip6.ip6_plen = htons(len);
+	  ip6.ip6_nxt = IPPROTO_ICMPV6;
+	}
+      else
+	{
+	  ip6.ip6_plen = htons(sizeof(struct udphdr) + len);
+	  ip6.ip6_nxt = IPPROTO_UDP;
+	}
+      
       if (src)
 	{
 	  memcpy(&ip6.ip6_src, &src->in6.sin6_addr, IN6ADDRSZ);
@@ -134,9 +147,8 @@ void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, unio
       /* start UDP checksum */
       for (sum = 0, i = 0; i < IN6ADDRSZ; i+=2)
 	{
-	  sum += ip6.ip6_src.s6_addr[i] + (ip6.ip6_src.s6_addr[i+1] << 8) ;
-	  sum += ip6.ip6_dst.s6_addr[i] + (ip6.ip6_dst.s6_addr[i+1] << 8) ;
-	  
+	  sum += ntohs((ip6.ip6_src.s6_addr[i] << 8) + (ip6.ip6_src.s6_addr[i+1])) ;
+	  sum += ntohs((ip6.ip6_dst.s6_addr[i] << 8) + (ip6.ip6_dst.s6_addr[i+1])) ; 
 	}
     }
   else
@@ -147,9 +159,18 @@ void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, unio
       
       ip.ip_v = IPVERSION;
       ip.ip_hl = sizeof(struct ip) / 4;
-      ip.ip_len = htons(sizeof(struct ip) + sizeof(struct udphdr) + len); 
       ip.ip_ttl = IPDEFTTL;
-      ip.ip_p = IPPROTO_UDP;
+
+      if (port == -1)
+	{
+	  ip.ip_len = htons(sizeof(struct ip) + len);
+	  ip.ip_p = IPPROTO_ICMP;
+	}
+      else
+	{
+	  ip.ip_len = htons(sizeof(struct ip) + sizeof(struct udphdr) + len); 
+	  ip.ip_p = IPPROTO_UDP;
+	}
       
       if (src)
 	{
@@ -180,31 +201,59 @@ void dump_packet(int mask, void *packet, size_t len, union mysockaddr *src, unio
   if (len & 1)
     ((unsigned char *)packet)[len] = 0; /* for checksum, in case length is odd. */
 
-  udp.uh_sum = 0;
-  udp.uh_ulen = htons(sizeof(struct udphdr) + len);
-  sum += htons(IPPROTO_UDP);
-  sum += htons(sizeof(struct udphdr) + len);
-  for (i = 0; i < sizeof(struct udphdr)/2; i++)
-    sum += ((u16 *)&udp)[i];
-  for (i = 0; i < (len + 1) / 2; i++)
-    sum += ((u16 *)packet)[i];
-  while (sum >> 16)
-    sum = (sum & 0xffff) + (sum >> 16);
-  udp.uh_sum = (sum == 0xffff) ? sum : ~sum;
+  if (port == -1)
+    {
+      /* ICMP - ICMPv6 packet is a superset of ICMP */
+      struct icmp6_hdr *icmp = packet;
+      
+      /* See comment in UDP code below. */
+      sum += htons((family == AF_INET6) ? IPPROTO_ICMPV6 : IPPROTO_ICMP);
+      sum += htons(len);
+      
+      icmp->icmp6_cksum = 0;
+      for (i = 0; i < (len + 1) / 2; i++)
+	sum += ((u16 *)packet)[i];
+      while (sum >> 16)
+	sum = (sum & 0xffff) + (sum >> 16);
+      icmp->icmp6_cksum = (sum == 0xffff) ? sum : ~sum;
 
+      pcap_header.incl_len = pcap_header.orig_len = ipsz + len;
+    }
+  else
+    {
+      /* Add Remaining part of the pseudoheader. Note that though the
+	 IPv6 pseudoheader is very different to the IPv4 one, the 
+	 net result of this calculation is correct as long as the 
+	 packet length is less than 65536, which is fine for us. */
+      sum += htons(IPPROTO_UDP);
+      sum += htons(sizeof(struct udphdr) + len);
+      
+      udp.uh_sum = 0;
+      udp.uh_ulen = htons(sizeof(struct udphdr) + len);
+      
+      for (i = 0; i < sizeof(struct udphdr)/2; i++)
+	sum += ((u16 *)&udp)[i];
+      for (i = 0; i < (len + 1) / 2; i++)
+	sum += ((u16 *)packet)[i];
+      while (sum >> 16)
+	sum = (sum & 0xffff) + (sum >> 16);
+      udp.uh_sum = (sum == 0xffff) ? sum : ~sum;
+
+      pcap_header.incl_len = pcap_header.orig_len = ipsz + sizeof(udp) + len;
+    }
+  
   rc = gettimeofday(&time, NULL);
   pcap_header.ts_sec = time.tv_sec;
   pcap_header.ts_usec = time.tv_usec;
-  pcap_header.incl_len = pcap_header.orig_len = ipsz + sizeof(udp) + len;
   
   if (rc == -1 ||
       !read_write(daemon->dumpfd, (void *)&pcap_header, sizeof(pcap_header), 0) ||
       !read_write(daemon->dumpfd, iphdr, ipsz, 0) ||
-      !read_write(daemon->dumpfd, (void *)&udp, sizeof(udp), 0) ||
+      (port != -1 && !read_write(daemon->dumpfd, (void *)&udp, sizeof(udp), 0)) ||
       !read_write(daemon->dumpfd, (void *)packet, len, 0))
     my_syslog(LOG_ERR, _("failed to write packet dump"));
   else
-    my_syslog(LOG_INFO, _("dumping UDP packet %u mask 0x%04x"), ++packet_count, mask);
+    my_syslog(LOG_INFO, _("dumping packet %u mask 0x%04x"), ++packet_count, mask);
 
 }
 

src/edns0.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -178,7 +178,7 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
 	    memcpy(buff, datap, rdlen);	      
 	  
 	  /* now, delete OPT RR */
-	  plen = rrfilter(header, plen, 0);
+	  plen = rrfilter(header, plen, RRFILTER_EDNS0);
 	  
 	  /* Now, force addition of a new one */
 	  p = NULL;	  
@@ -264,44 +264,62 @@ static void encoder(unsigned char *in, char *out)
   out[3] = char64(in[2]);
 }
 
+/* OPT_ADD_MAC = MAC is added (if available)
+   OPT_ADD_MAC + OPT_STRIP_MAC = MAC is replaced, if not available, it is only removed
+   OPT_STRIP_MAC = MAC is removed */
 static size_t add_dns_client(struct dns_header *header, size_t plen, unsigned char *limit,
 			     union mysockaddr *l3, time_t now, int *cacheablep)
 {
-  int maclen, replace = 2; /* can't get mac address, just delete any incoming. */
+  int replace = 0, maclen = 0;
   unsigned char mac[DHCP_CHADDR_MAX];
-  char encode[18]; /* handle 6 byte MACs */
+  char encode[18]; /* handle 6 byte MACs ONLY */
 
-  if ((maclen = find_mac(l3, mac, 1, now)) == 6)
+  if ((option_bool(OPT_MAC_B64) || option_bool(OPT_MAC_HEX)) && (maclen = find_mac(l3, mac, 1, now)) == 6)
     {
-      replace = 1;
-      *cacheablep = 0;
-
-      if (option_bool(OPT_MAC_HEX))
-	print_mac(encode, mac, maclen);
-      else
-	{
-	  encoder(mac, encode);
-	  encoder(mac+3, encode+4);
-	  encode[8] = 0;
-	}
+      if (option_bool(OPT_STRIP_MAC))
+	 replace = 1;
+       *cacheablep = 0;
+    
+       if (option_bool(OPT_MAC_HEX))
+	 print_mac(encode, mac, maclen);
+       else
+	 {
+	   encoder(mac, encode);
+	   encoder(mac+3, encode+4);
+	   encode[8] = 0;
+	 }
     }
+  else if (option_bool(OPT_STRIP_MAC))
+    replace = 2;
 
-  return add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_NOMDEVICEID, (unsigned char *)encode, strlen(encode), 0, replace); 
+  if (replace != 0 || maclen == 6)
+    plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_NOMDEVICEID, (unsigned char *)encode, strlen(encode), 0, replace);
+
+  return plen;
 }
 
 
+/* OPT_ADD_MAC = MAC is added (if available)
+   OPT_ADD_MAC + OPT_STRIP_MAC = MAC is replaced, if not available, it is only removed
+   OPT_STRIP_MAC = MAC is removed */
 static size_t add_mac(struct dns_header *header, size_t plen, unsigned char *limit,
 		      union mysockaddr *l3, time_t now, int *cacheablep)
 {
-  int maclen;
+  int maclen = 0, replace = 0;
   unsigned char mac[DHCP_CHADDR_MAX];
-
-  if ((maclen = find_mac(l3, mac, 1, now)) != 0)
+    
+  if (option_bool(OPT_ADD_MAC) && (maclen = find_mac(l3, mac, 1, now)) != 0)
     {
       *cacheablep = 0;
-      plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_MAC, mac, maclen, 0, 0); 
+      if (option_bool(OPT_STRIP_MAC))
+	replace = 1;
     }
+  else if (option_bool(OPT_STRIP_MAC))
+    replace = 2;
   
+  if (replace != 0 || maclen != 0)
+    plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_MAC, mac, maclen, 0, replace);
+
   return plen; 
 }
 
@@ -378,15 +396,29 @@ static size_t calc_subnet_opt(struct subnet_opt *opt, union mysockaddr *source,
   return len + 4;
 }
  
-static size_t add_source_addr(struct dns_header *header, size_t plen, unsigned char *limit, union mysockaddr *source, int *cacheable)
+/* OPT_CLIENT_SUBNET = client subnet is added
+   OPT_CLIENT_SUBNET + OPT_STRIP_ECS = client subnet is replaced
+   OPT_STRIP_ECS = client subnet is removed */
+static size_t add_source_addr(struct dns_header *header, size_t plen, unsigned char *limit,
+			      union mysockaddr *source, int *cacheable)
 {
   /* http://tools.ietf.org/html/draft-vandergaast-edns-client-subnet-02 */
   
-  int len;
+  int replace = 0, len = 0;
   struct subnet_opt opt;
   
-  len = calc_subnet_opt(&opt, source, cacheable);
-  return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, EDNS0_OPTION_CLIENT_SUBNET, (unsigned char *)&opt, len, 0, 0);
+  if (option_bool(OPT_CLIENT_SUBNET))
+    {
+      if (option_bool(OPT_STRIP_ECS))
+	replace = 1;
+      len = calc_subnet_opt(&opt, source, cacheable);
+    }
+  else if (option_bool(OPT_STRIP_ECS))
+    replace = 2;
+  else
+    return plen;
+
+  return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, EDNS0_OPTION_CLIENT_SUBNET, (unsigned char *)&opt, len, 0, replace);
 }
 
 int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer)
@@ -460,47 +492,45 @@ static size_t add_umbrella_opt(struct dns_header *header, size_t plen, unsigned
 
   struct umbrella_opt opt = {{"ODNS"}, UMBRELLA_VERSION, 0, {}};
   u8 *u = &opt.fields[0];
-
-  if (daemon->umbrella_org) {
-    PUTSHORT(UMBRELLA_ORG, u);
-    PUTLONG(daemon->umbrella_org, u);
-  }
-
   int family = source->sa.sa_family;
-  PUTSHORT(family == AF_INET ? UMBRELLA_IPV4 : UMBRELLA_IPV6, u);
   int size = family == AF_INET ? INADDRSZ : IN6ADDRSZ;
+
+  if (daemon->umbrella_org)
+    {
+      PUTSHORT(UMBRELLA_ORG, u);
+      PUTLONG(daemon->umbrella_org, u);
+    }
+  
+  PUTSHORT(family == AF_INET ? UMBRELLA_IPV4 : UMBRELLA_IPV6, u);
   memcpy(u, get_addrp(source, family), size);
   u += size;
+  
+  if (option_bool(OPT_UMBRELLA_DEVID))
+    {
+      PUTSHORT(UMBRELLA_DEVICE, u);
+      memcpy(u, (char *)&daemon->umbrella_device, UMBRELLA_DEVICESZ);
+      u += UMBRELLA_DEVICESZ;
+    }
 
-  if (option_bool(OPT_UMBRELLA_DEVID)) {
-    PUTSHORT(UMBRELLA_DEVICE, u);
-    memcpy(u, (char *)&daemon->umbrella_device, UMBRELLA_DEVICESZ);
-    u += UMBRELLA_DEVICESZ;
-  }
-
-  if (daemon->umbrella_asset) {
-    PUTSHORT(UMBRELLA_ASSET, u);
-    PUTLONG(daemon->umbrella_asset, u);
-  }
-
-  int len = u - &opt.magic[0];
-  return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, EDNS0_OPTION_UMBRELLA, (unsigned char *)&opt, len, 0, 1);
+  if (daemon->umbrella_asset)
+    {
+      PUTSHORT(UMBRELLA_ASSET, u);
+      PUTLONG(daemon->umbrella_asset, u);
+    }
+  
+  return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, EDNS0_OPTION_UMBRELLA, (unsigned char *)&opt, u - (u8 *)&opt, 0, 1);
 }
 
 /* Set *check_subnet if we add a client subnet option, which needs to checked 
    in the reply. Set *cacheable to zero if we add an option which the answer
    may depend on. */
 size_t add_edns0_config(struct dns_header *header, size_t plen, unsigned char *limit, 
-			union mysockaddr *source, time_t now, int *check_subnet, int *cacheable)    
+			union mysockaddr *source, time_t now, int *cacheable)    
 {
-  *check_subnet = 0;
   *cacheable = 1;
   
-  if (option_bool(OPT_ADD_MAC))
-    plen  = add_mac(header, plen, limit, source, now, cacheable);
-  
-  if (option_bool(OPT_MAC_B64) || option_bool(OPT_MAC_HEX))
-    plen = add_dns_client(header, plen, limit, source, now, cacheable);
+  plen  = add_mac(header, plen, limit, source, now, cacheable);
+  plen = add_dns_client(header, plen, limit, source, now, cacheable);
   
   if (daemon->dns_client_id)
     plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_NOMCPEID, 
@@ -509,11 +539,7 @@ size_t add_edns0_config(struct dns_header *header, size_t plen, unsigned char *l
   if (option_bool(OPT_UMBRELLA))
     plen = add_umbrella_opt(header, plen, limit, source, cacheable);
   
-  if (option_bool(OPT_CLIENT_SUBNET))
-    {
-      plen = add_source_addr(header, plen, limit, source, cacheable); 
-      *check_subnet = 1;
-    }
-	  
+  plen = add_source_addr(header, plen, limit, source, cacheable);
+  	  
   return plen;
 }

src/forward.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -19,6 +19,9 @@
 static struct frec *get_new_frec(time_t now, struct server *serv, int force);
 static struct frec *lookup_frec(unsigned short id, int fd, void *hash, int *firstp, int *lastp);
 static struct frec *lookup_frec_by_query(void *hash, unsigned int flags, unsigned int flagmask);
+#ifdef HAVE_DNSSEC
+static struct frec *lookup_frec_dnssec(char *target, int class, int flags, struct dns_header *header);
+#endif
 
 static unsigned short get_id(void);
 static void free_frec(struct frec *f);
@@ -119,12 +122,20 @@ static void set_outgoing_mark(struct frec *forward, int fd)
 }
 #endif
 
-static void log_query_mysockaddr(unsigned int flags, char *name, union mysockaddr *addr, char *arg)
+static void log_query_mysockaddr(unsigned int flags, char *name, union mysockaddr *addr, char *arg, unsigned short type)
 {
   if (addr->sa.sa_family == AF_INET)
-    log_query(flags | F_IPV4, name, (union all_addr *)&addr->in.sin_addr, arg);
+    {
+      if (flags & F_SERVER)
+	type = ntohs(addr->in.sin_port);
+      log_query(flags | F_IPV4, name, (union all_addr *)&addr->in.sin_addr, arg, type);
+    }
   else
-    log_query(flags | F_IPV6, name, (union all_addr *)&addr->in6.sin6_addr, arg);
+    {
+      if (flags & F_SERVER)
+	type = ntohs(addr->in6.sin6_port);
+      log_query(flags | F_IPV6, name, (union all_addr *)&addr->in6.sin6_addr, arg, type);
+    }
 }
 
 static void server_send(struct server *server, int fd,
@@ -135,28 +146,24 @@ static void server_send(struct server *server, int fd,
 			   sa_len(&server->addr))));
 }
 
-#ifdef HAVE_DNSSEC
-static void server_send_log(struct server *server, int fd,
-			const void *header, size_t plen, int dumpflags,
-			unsigned int logflags, char *name, char *arg)
-{
-#ifdef HAVE_DUMPFILE
-	  dump_packet(dumpflags, (void *)header, (size_t)plen, NULL, &server->addr);
-#endif
-	  log_query_mysockaddr(logflags, name, &server->addr, arg);
-	  server_send(server, fd, header, plen, 0);
-}
-#endif
-
 static int domain_no_rebind(char *domain)
 {
-  struct server *serv;
-  int dlen = (int)strlen(domain);
-  
-  for (serv = daemon->no_rebind; serv; serv = serv->next)
-    if (dlen >= serv->domain_len && strcmp(serv->domain, &domain[dlen - serv->domain_len]) == 0)
+  struct rebind_domain *rbd;
+  size_t tlen, dlen = strlen(domain);
+  char *dots = strchr(domain, '.');
+
+  /* Match whole labels only. Empty domain matches no dots (any single label) */
+  for (rbd = daemon->no_rebind; rbd; rbd = rbd->next)
+    {
+      if (dlen >= (tlen = strlen(rbd->domain)) &&
+	hostname_isequal(rbd->domain, &domain[dlen - tlen]) &&
+	(dlen == tlen || domain[dlen - tlen - 1] == '.'))
       return 1;
 
+      if (tlen == 0 && !dots)
+	return 1;
+    }
+  
   return 0;
 }
 
@@ -169,12 +176,12 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
   unsigned int fwd_flags = 0;
   int is_dnssec = forward && (forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY));
   struct server *master;
-  unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL);
   void *hash = hash_questions(header, plen, daemon->namebuff);
+  unsigned int gotname = extract_request(header, plen, daemon->namebuff, NULL);
   unsigned char *oph = find_pseudoheader(header, plen, NULL, NULL, NULL, NULL);
-  int old_src = 0;
+  int old_src = 0, old_reply = 0;
   int first, last, start = 0;
-  int subnet, cacheable, forwarded = 0;
+  int cacheable, forwarded = 0;
   size_t edns0_len;
   unsigned char *pheader;
   int ede = EDE_UNSET;
@@ -198,7 +205,10 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
      Similarly FREC_NO_CACHE is never set in flags, so a query which is
      contigent on a particular source address EDNS0 option will never be matched. */
   if (forward)
-    old_src = 1;
+    {
+      old_src = 1;
+      old_reply = 1;
+    }
   else if ((forward = lookup_frec_by_query(hash, fwd_flags,
 					   FREC_CHECKING_DISABLED | FREC_AD_QUESTION | FREC_DO_QUESTION |
 					   FREC_HAS_PHEADER | FREC_DNSKEY_QUERY | FREC_DS_QUERY | FREC_NO_CACHE)))
@@ -211,7 +221,11 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
 	  break;
       
       if (src)
-	old_src = 1;
+	{
+	  old_src = 1;
+	  /* If a query is retried, use the log_id for the retry when logging the answer. */
+	  src->log_id = daemon->log_id;
+	}
       else
 	{
 	  /* Existing query, but from new source, just add this 
@@ -255,6 +269,15 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
   /* new query */
   if (!forward)
     {
+      /* If the query is malformed, we can't forward it because
+	 we can't get a reliable hash to recognise the answer. */
+      if (!hash)
+	{
+	  flags = 0;
+	  ede = EDE_INVALID_DATA;
+	  goto reply;
+	}
+      
       if (lookup_domain(daemon->namebuff, gotname, &first, &last))
 	flags = is_local_answer(now, first, daemon->namebuff);
       else
@@ -282,6 +305,7 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
 	goto reply;
       /* table full - flags == 0, return REFUSED */
       
+      forward->frec_src.log_id = daemon->log_id;
       forward->frec_src.source = *udpaddr;
       forward->frec_src.orig_id = ntohs(header->id);
       forward->frec_src.dest = *dst_addr;
@@ -325,7 +349,6 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
     }
   else
     {
-      /* retry on existing query, from original source. Send to all available servers  */
 #ifdef HAVE_DNSSEC
       /* If we've already got an answer to this query, but we're awaiting keys for validation,
 	 there's no point retrying the query, retry the key query instead...... */
@@ -336,7 +359,10 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
 	  
 	  while (forward->blocking_query)
 	    forward = forward->blocking_query;
-	   
+
+	  /* log_id should match previous DNSSEC query. */
+	  daemon->log_display_id = forward->frec_src.log_id;
+	  
 	  blockdata_retrieve(forward->stash, forward->stash_len, (void *)header);
 	  plen = forward->stash_len;
 	  /* get query for logging. */
@@ -375,9 +401,18 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
 		  /* In strict order mode, there must be a server later in the list
 		     left to send to, otherwise without the forwardall mechanism,
 		     code further on will cycle around the list forwever if they
-		     all return REFUSED. If at the last, give up. */
+		     all return REFUSED. If at the last, give up.
+		     Note that we can get here EITHER because a client retried,
+		     or an upstream server returned REFUSED. The above only
+		     applied in the later case. For client retries,
+		     keep trying the last server.. */
 		  if (++start == last)
-		    goto reply;
+		    {
+		      if (old_reply)
+			goto reply;
+		      else
+			start--;
+		    }
 		}
 	    }	  
 	}
@@ -389,18 +424,12 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
       forward->flags |= FREC_TEST_PKTSZ;
     }
 
-  /* If a query is retried, use the log_id for the retry when logging the answer. */
-  forward->frec_src.log_id = daemon->log_id;
-
   /* We may be resending a DNSSEC query here, for which the below processing is not necessary. */
   if (!is_dnssec)
     {
       header->id = htons(forward->new_id);
       
-      plen = add_edns0_config(header, plen, ((unsigned char *)header) + PACKETSZ, &forward->frec_src.source, now, &subnet, &cacheable);
-      
-      if (subnet)
-	forward->flags |= FREC_HAS_SUBNET;
+      plen = add_edns0_config(header, plen, ((unsigned char *)header) + PACKETSZ, &forward->frec_src.source, now, &cacheable);
       
       if (!cacheable)
 	forward->flags |= FREC_NO_CACHE;
@@ -481,7 +510,7 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
 	  if (errno == 0)
 	    {
 #ifdef HAVE_DUMPFILE
-	      dump_packet(DUMP_UP_QUERY, (void *)header, plen, NULL, &srv->addr);
+	      dump_packet(DUMP_UP_QUERY, (void *)header, plen, NULL, &srv->addr, daemon->port);
 #endif
 	      
 	      /* Keep info in case we want to re-send this packet */
@@ -494,12 +523,12 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
 		  if (!gotname)
 		    strcpy(daemon->namebuff, "query");
 		  log_query_mysockaddr(F_SERVER | F_FORWARD, daemon->namebuff,
-				       &srv->addr, NULL);
+				       &srv->addr, NULL, 0);
 		}
 #ifdef HAVE_DNSSEC
 	      else
 		log_query_mysockaddr(F_NOEXTRA | F_DNSSEC, daemon->namebuff, &srv->addr,
-				     querystr("dnssec-retry", (forward->flags & FREC_DNSKEY_QUERY) ? T_DNSKEY : T_DS));
+				     "dnssec-retry", (forward->flags & FREC_DNSKEY_QUERY) ? T_DNSKEY : T_DS);
 #endif
 
 	      srv->queries++;
@@ -555,12 +584,33 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
   return 0;
 }
 
+static struct ipsets *domain_find_sets(struct ipsets *setlist, const char *domain) {
+  /* Similar algorithm to search_servers. */
+  struct ipsets *ipset_pos, *ret = NULL;
+  unsigned int namelen = strlen(domain);
+  unsigned int matchlen = 0;
+  for (ipset_pos = setlist; ipset_pos; ipset_pos = ipset_pos->next) 
+    {
+      unsigned int domainlen = strlen(ipset_pos->domain);
+      const char *matchstart = domain + namelen - domainlen;
+      if (namelen >= domainlen && hostname_isequal(matchstart, ipset_pos->domain) &&
+          (domainlen == 0 || namelen == domainlen || *(matchstart - 1) == '.' ) &&
+          domainlen >= matchlen) 
+        {
+          matchlen = domainlen;
+          ret = ipset_pos;
+        }
+    }
+
+  return ret;
+}
+
 static size_t process_reply(struct dns_header *header, time_t now, struct server *server, size_t n, int check_rebind, 
 			    int no_cache, int cache_secure, int bogusanswer, int ad_reqd, int do_bit, int added_pheader, 
-			    int check_subnet, union mysockaddr *query_source, unsigned char *limit, int ede)
+			    union mysockaddr *query_source, unsigned char *limit, int ede)
 {
   unsigned char *pheader, *sizep;
-  char **sets = 0;
+  struct ipsets *ipsets = NULL, *nftsets = NULL;
   int munged = 0, is_sign;
   unsigned int rcode = RCODE(header);
   size_t plen; 
@@ -571,24 +621,12 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
 
 #ifdef HAVE_IPSET
   if (daemon->ipsets && extract_request(header, n, daemon->namebuff, NULL))
-    {
-      /* Similar algorithm to search_servers. */
-      struct ipsets *ipset_pos;
-      unsigned int namelen = strlen(daemon->namebuff);
-      unsigned int matchlen = 0;
-      for (ipset_pos = daemon->ipsets; ipset_pos; ipset_pos = ipset_pos->next) 
-	{
-	  unsigned int domainlen = strlen(ipset_pos->domain);
-	  char *matchstart = daemon->namebuff + namelen - domainlen;
-	  if (namelen >= domainlen && hostname_isequal(matchstart, ipset_pos->domain) &&
-	      (domainlen == 0 || namelen == domainlen || *(matchstart - 1) == '.' ) &&
-	      domainlen >= matchlen) 
-	    {
-	      matchlen = domainlen;
-	      sets = ipset_pos->sets;
-	    }
-	}
-    }
+    ipsets = domain_find_sets(daemon->ipsets, daemon->namebuff);
+#endif
+
+#ifdef HAVE_NFTSET
+  if (daemon->nftsets && extract_request(header, n, daemon->namebuff, NULL))
+    nftsets = domain_find_sets(daemon->nftsets, daemon->namebuff);
 #endif
 
   if ((pheader = find_pseudoheader(header, n, &plen, &sizep, &is_sign, NULL)))
@@ -596,7 +634,7 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
       /* Get extended RCODE. */
       rcode |= sizep[2] << 4;
 
-      if (check_subnet && !check_source(header, plen, pheader, query_source))
+      if (option_bool(OPT_CLIENT_SUBNET) && !check_source(header, plen, pheader, query_source))
 	{
 	  my_syslog(LOG_WARNING, _("discarding DNS reply: subnet option mismatch"));
 	  return 0;
@@ -607,7 +645,7 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
 	  if (added_pheader)
 	    {
 	      /* client didn't send EDNS0, we added one, strip it off before returning answer. */
-	      n = rrfilter(header, n, 0);
+	      n = rrfilter(header, n, RRFILTER_EDNS0);
 	      pheader = NULL;
 	    }
 	  else
@@ -653,7 +691,7 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
       union all_addr a;
       a.log.rcode = rcode;
       a.log.ede = ede;
-      log_query(F_UPSTREAM | F_RCODE, "error", &a, NULL);
+      log_query(F_UPSTREAM | F_RCODE, "error", &a, NULL, 0);
       
       return resize_packet(header, n, pheader, plen);
     }
@@ -696,8 +734,18 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
 	      cache_secure = 0;
 	    }
 	}
-      
-      if (extract_addresses(header, n, daemon->namebuff, now, sets, is_sign, check_rebind, no_cache, cache_secure, &doctored))
+
+      /* Before extract_addresses() */
+      if (rcode == NOERROR)
+	{
+	  if (option_bool(OPT_FILTER_A))
+	    n = rrfilter(header, n, RRFILTER_A);
+
+	  if (option_bool(OPT_FILTER_AAAA))
+	    n = rrfilter(header, n, RRFILTER_AAAA);
+	}
+
+      if (extract_addresses(header, n, daemon->namebuff, now, ipsets, nftsets, is_sign, check_rebind, no_cache, cache_secure, &doctored))
 	{
 	  my_syslog(LOG_WARNING, _("possible DNS-rebind attack detected: %s"), daemon->namebuff);
 	  munged = 1;
@@ -726,7 +774,7 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
       
       /* If the requestor didn't set the DO bit, don't return DNSSEC info. */
       if (!do_bit)
-	n = rrfilter(header, n, 1);
+	n = rrfilter(header, n, RRFILTER_DNSSEC);
     }
 #endif
 
@@ -750,7 +798,7 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
       u16 swap = htons((u16)ede);
       n = add_pseudoheader(header, n, limit, daemon->edns_pktsz, EDNS0_OPTION_EDE, (unsigned char *)&swap, 2, do_bit, 1);
     }
-  
+
   return n;
 }
 
@@ -792,7 +840,7 @@ static void dnssec_validate(struct frec *forward, struct dns_header *header,
 #ifdef HAVE_DUMPFILE
       if (STAT_ISEQUAL(status, STAT_BOGUS))
 	dump_packet((forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY)) ? DUMP_SEC_BOGUS : DUMP_BOGUS,
-		    header, (size_t)plen, &forward->sentto->addr, NULL);
+		    header, (size_t)plen, &forward->sentto->addr, NULL, daemon->port);
 #endif
     }
   
@@ -801,106 +849,127 @@ static void dnssec_validate(struct frec *forward, struct dns_header *header,
   if (STAT_ISEQUAL(status, STAT_NEED_DS) || STAT_ISEQUAL(status, STAT_NEED_KEY))
     {
       struct frec *new = NULL;
-      int serverind;
       struct blockdata *stash;
       
       /* Now save reply pending receipt of key data */
-      if ((serverind = dnssec_server(forward->sentto, daemon->keyname, NULL, NULL)) != -1 &&
-	  (stash = blockdata_alloc((char *)header, plen)))
+      if ((stash = blockdata_alloc((char *)header, plen)))
 	{
-	  struct server *server = daemon->serverarray[serverind];
-	  struct frec *orig;
-	  unsigned int flags;
-	  void *hash;
-	  size_t nn;
-
 	  /* validate routines leave name of required record in daemon->keyname */
-	  nn = dnssec_generate_query(header, ((unsigned char *) header) + server->edns_pktsz,
-				     daemon->keyname, forward->class,
-				     STAT_ISEQUAL(status, STAT_NEED_KEY) ? T_DNSKEY : T_DS, server->edns_pktsz);
-	  
-	  flags = STAT_ISEQUAL(status, STAT_NEED_KEY) ? FREC_DNSKEY_QUERY : FREC_DS_QUERY;
-	  hash = hash_questions(header, nn, daemon->namebuff);
+	  unsigned int flags = STAT_ISEQUAL(status, STAT_NEED_KEY) ? FREC_DNSKEY_QUERY : FREC_DS_QUERY;
 
-	  if ((new = lookup_frec_by_query(hash, flags, FREC_DNSKEY_QUERY | FREC_DS_QUERY)))
+	  if ((new = lookup_frec_dnssec(daemon->keyname, forward->class, flags, header)))
 	    {
-	      forward->next_dependent = new->dependent;
-	      new->dependent = forward;
-	      /* Make consistent, only replace query copy with unvalidated answer
-		 when we set ->blocking_query. */
-	      if (forward->stash)
-		blockdata_free(forward->stash);
-	      forward->blocking_query = new;
-	      forward->stash_len = plen;
-	      forward->stash = stash;
-	      return;
+	      /* This is tricky; it detects loops in the dependency
+		 graph for DNSSEC validation, say validating A requires DS B
+		 and validating DS B requires DNSKEY C and validating DNSKEY C requires DS B.
+		 This should never happen in correctly signed records, but it's
+		 likely the case that sufficiently broken ones can cause our validation
+		 code requests to exhibit cycles. The result is that the ->blocking_query list
+		 can form a cycle, and under certain circumstances that can lock us in 
+		 an infinite loop. Here we transform the situation into ABANDONED. */
+	      struct frec *f;
+	      for (f = new; f; f = f->blocking_query)
+		if (f == forward)
+		  break;
+
+	      if (!f)
+		{
+		  forward->next_dependent = new->dependent;
+		  new->dependent = forward;
+		  /* Make consistent, only replace query copy with unvalidated answer
+		     when we set ->blocking_query. */
+		  if (forward->stash)
+		    blockdata_free(forward->stash);
+		  forward->blocking_query = new;
+		  forward->stash_len = plen;
+		  forward->stash = stash;
+		  return;
+		}
 	    }
-	    
-	  /* Find the original query that started it all.... */
-	  for (orig = forward; orig->dependent; orig = orig->dependent);
-	  
-	  /* Make sure we don't expire and free the orig frec during the
-	     allocation of a new one: third arg of get_new_frec() does that. */
-	  if (--orig->work_counter == 0 || !(new = get_new_frec(now, server, 1)))
-	    blockdata_free(stash); /* don't leak this on failure. */
 	  else
 	    {
-	      int fd;
-	      struct frec *next = new->next;
-
-	      *new = *forward; /* copy everything, then overwrite */
-	      new->next = next;
-	      new->blocking_query = NULL;
+	      struct server *server;
+	      struct frec *orig;
+	      void *hash;
+	      size_t nn;
+	      int serverind, fd;
+	      struct randfd_list *rfds = NULL;
 	      
-	      new->frec_src.log_id = daemon->log_display_id = ++daemon->log_id;
-	      new->sentto = server;
-	      new->rfds = NULL;
-	      new->frec_src.next = NULL;
-	      new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY | FREC_HAS_EXTRADATA);
-	      new->flags |= flags;
-	      new->forwardall = 0;
+	      /* Find the original query that started it all.... */
+	      for (orig = forward; orig->dependent; orig = orig->dependent);
 	      
-	      forward->next_dependent = NULL;
-	      new->dependent = forward; /* to find query awaiting new one. */
-
-	      /* Make consistent, only replace query copy with unvalidated answer
-		 when we set ->blocking_query. */
-	      forward->blocking_query = new; 
-	      if (forward->stash)
-		blockdata_free(forward->stash);
-	      forward->stash_len = plen;
-	      forward->stash = stash;
-	      
-	      memcpy(new->hash, hash, HASH_SIZE);
-	      new->new_id = get_id();
-	      header->id = htons(new->new_id);
-	      /* Save query for retransmission */
-	      new->stash = blockdata_alloc((char *)header, nn);
-	      new->stash_len = nn;
-	      
-	      /* Don't resend this. */
-	      daemon->srv_save = NULL;
-	      
-	      if ((fd = allocate_rfd(&new->rfds, server)) != -1)
+	      /* Make sure we don't expire and free the orig frec during the
+		 allocation of a new one: third arg of get_new_frec() does that. */
+	      if ((serverind = dnssec_server(forward->sentto, daemon->keyname, NULL, NULL)) != -1 &&
+		  (server = daemon->serverarray[serverind]) &&
+		  (nn = dnssec_generate_query(header, ((unsigned char *) header) + server->edns_pktsz,
+					      daemon->keyname, forward->class,
+					      STAT_ISEQUAL(status, STAT_NEED_KEY) ? T_DNSKEY : T_DS, server->edns_pktsz)) && 
+		  (hash = hash_questions(header, nn, daemon->namebuff)) &&
+		  --orig->work_counter != 0 &&
+		  (fd = allocate_rfd(&rfds, server)) != -1 &&
+		  (new = get_new_frec(now, server, 1)))
 		{
+		  struct frec *next = new->next;
+		  
+		  *new = *forward; /* copy everything, then overwrite */
+		  new->next = next;
+		  new->blocking_query = NULL;
+		  
+		  new->frec_src.log_id = daemon->log_display_id = ++daemon->log_id;
+		  new->sentto = server;
+		  new->rfds = rfds;
+		  new->frec_src.next = NULL;
+		  new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY | FREC_HAS_EXTRADATA);
+		  new->flags |= flags;
+		  new->forwardall = 0;
+		  
+		  forward->next_dependent = NULL;
+		  new->dependent = forward; /* to find query awaiting new one. */
+		  
+		  /* Make consistent, only replace query copy with unvalidated answer
+		     when we set ->blocking_query. */
+		  forward->blocking_query = new; 
+		  if (forward->stash)
+		    blockdata_free(forward->stash);
+		  forward->stash_len = plen;
+		  forward->stash = stash;
+		  
+		  memcpy(new->hash, hash, HASH_SIZE);
+		  new->new_id = get_id();
+		  header->id = htons(new->new_id);
+		  /* Save query for retransmission and de-dup */
+		  new->stash = blockdata_alloc((char *)header, nn);
+		  new->stash_len = nn;
+		  
+		  /* Don't resend this. */
+		  daemon->srv_save = NULL;
+		  
 #ifdef HAVE_CONNTRACK
 		  if (option_bool(OPT_CONNTRACK))
 		    set_outgoing_mark(orig, fd);
 #endif
-		  server_send_log(server, fd, header, nn, DUMP_SEC_QUERY,
-				  F_NOEXTRA | F_DNSSEC, daemon->keyname,
-				  querystr("dnssec-query", STAT_ISEQUAL(status, STAT_NEED_KEY) ? T_DNSKEY : T_DS));
+		  
+#ifdef HAVE_DUMPFILE
+		  dump_packet(DUMP_SEC_QUERY, (void *)header, (size_t)nn, NULL, &server->addr, daemon->port);
+#endif
+		  log_query_mysockaddr(F_NOEXTRA | F_DNSSEC | F_SERVER, daemon->keyname, &server->addr,
+				       STAT_ISEQUAL(status, STAT_NEED_KEY) ? "dnssec-query[DNSKEY]" : "dnssec-query[DS]", 0);
+		  server_send(server, fd, header, nn, 0);
 		  server->queries++;
+		  return;
 		}
 	      
-	      return;
+	      free_rfds(&rfds); /* error unwind */
 	    }
+	  
+	  blockdata_free(stash); /* don't leak this on failure. */
 	}
 
-      /* sending DNSSEC query failed. */
+      /* sending DNSSEC query failed or loop detected. */
       status = STAT_ABANDONED;
     }
-  
+
   /* Validated original answer, all done. */
   if (!forward->dependent)
     return_reply(now, forward, header, plen, status);
@@ -978,7 +1047,7 @@ void reply_query(int fd, time_t now)
 
 #ifdef HAVE_DUMPFILE
   dump_packet((forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY)) ? DUMP_SEC_REPLY : DUMP_UP_REPLY,
-	      (void *)header, n, &serveraddr, NULL);
+	      (void *)header, n, &serveraddr, NULL, daemon->port);
 #endif
 
   /* log_query gets called indirectly all over the place, so 
@@ -1136,7 +1205,7 @@ static void return_reply(time_t now, struct frec *forward, struct dns_header *he
 		domain = daemon->namebuff;
 	    }
 	  
-	  log_query(F_SECSTAT, domain, &a, result);
+	  log_query(F_SECSTAT, domain, &a, result, 0);
 	}
     }
 #endif
@@ -1157,7 +1226,7 @@ static void return_reply(time_t now, struct frec *forward, struct dns_header *he
   
   if ((nn = process_reply(header, now, forward->sentto, (size_t)n, check_rebind, no_cache_dnssec, cache_secure, bogusanswer, 
 			  forward->flags & FREC_AD_QUESTION, forward->flags & FREC_DO_QUESTION, 
-			  forward->flags & FREC_ADDED_PHEADER, forward->flags & FREC_HAS_SUBNET, &forward->frec_src.source,
+			  forward->flags & FREC_ADDED_PHEADER, &forward->frec_src.source,
 			  ((unsigned char *)header) + daemon->edns_pktsz, ede)))
     {
       struct frec_src *src;
@@ -1182,7 +1251,7 @@ static void return_reply(time_t now, struct frec *forward, struct dns_header *he
 	  header->id = htons(src->orig_id);
 	  
 #ifdef HAVE_DUMPFILE
-	  dump_packet(DUMP_REPLY, daemon->packet, (size_t)nn, NULL, &src->source);
+	  dump_packet(DUMP_REPLY, daemon->packet, (size_t)nn, NULL, &src->source, daemon->port);
 #endif
 	  
 #if defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)
@@ -1202,7 +1271,7 @@ static void return_reply(time_t now, struct frec *forward, struct dns_header *he
 	    {
 	      daemon->log_display_id = src->log_id;
 	      daemon->log_source_addr = &src->source;
-	      log_query(F_UPSTREAM, "query", NULL, "duplicate");
+	      log_query(F_UPSTREAM, "query", NULL, "duplicate", 0);
 	    }
 	}
     }
@@ -1378,7 +1447,8 @@ void receive_query(struct listener *listen, time_t now)
 	  static int warned = 0;
 	  if (!warned)
 	    {
-	      my_syslog(LOG_WARNING, _("Ignoring query from non-local network"));
+	      prettyprint_addr(&source_addr, daemon->addrbuff);
+	      my_syslog(LOG_WARNING, _("ignoring query from non-local network %s (logged only once)"), daemon->addrbuff);
 	      warned = 1;
 	    }
 	  return;
@@ -1496,7 +1566,7 @@ void receive_query(struct listener *listen, time_t now)
   daemon->log_source_addr = &source_addr;
 
 #ifdef HAVE_DUMPFILE
-  dump_packet(DUMP_QUERY, daemon->packet, (size_t)n, &source_addr, NULL);
+  dump_packet(DUMP_QUERY, daemon->packet, (size_t)n, &source_addr, NULL, daemon->port);
 #endif
   
 #ifdef HAVE_CONNTRACK
@@ -1509,10 +1579,8 @@ void receive_query(struct listener *listen, time_t now)
 #ifdef HAVE_AUTH
       struct auth_zone *zone;
 #endif
-      char *types = querystr(auth_dns ? "auth" : "query", type);
-
       log_query_mysockaddr(F_QUERY | F_FORWARD, daemon->namebuff,
-			   &source_addr, types);
+			   &source_addr, auth_dns ? "auth" : "query", type);
       
 #ifdef HAVE_CONNTRACK
       is_single_query = 1;
@@ -1581,7 +1649,7 @@ void receive_query(struct listener *listen, time_t now)
       if (m >= 1)
 	{
 #ifdef HAVE_DUMPFILE
-	  dump_packet(DUMP_REPLY, daemon->packet, m, NULL, &source_addr);
+	  dump_packet(DUMP_REPLY, daemon->packet, m, NULL, &source_addr, daemon->port);
 #endif
 	  send_from(listen->fd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND),
 		    (char *)header, m, &source_addr, &dst_addr, if_index);
@@ -1597,7 +1665,7 @@ void receive_query(struct listener *listen, time_t now)
       if (m >= 1)
 	{
 #ifdef HAVE_DUMPFILE
-	  dump_packet(DUMP_REPLY, daemon->packet, m, NULL, &source_addr);
+	  dump_packet(DUMP_REPLY, daemon->packet, m, NULL, &source_addr, daemon->port);
 #endif
 #if defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)
 	  if (local_auth)
@@ -1623,7 +1691,7 @@ void receive_query(struct listener *listen, time_t now)
       if (m >= 1)
 	{
 #ifdef HAVE_DUMPFILE
-	  dump_packet(DUMP_REPLY, daemon->packet, m, NULL, &source_addr);
+	  dump_packet(DUMP_REPLY, daemon->packet, m, NULL, &source_addr, daemon->port);
 #endif
 #if defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)
 	  if (option_bool(OPT_CMARK_ALST_EN) && have_mark && ((u32)mark & daemon->allowlist_mask))
@@ -1651,13 +1719,16 @@ static ssize_t tcp_talk(int first, int last, int start, unsigned char *packet,
   unsigned char *payload = &packet[2];
   struct dns_header *header = (struct dns_header *)payload;
   unsigned char c1, c2;
-  unsigned char hash[HASH_SIZE];
+  unsigned char hash[HASH_SIZE], *hashp;
   unsigned int rsize;
   
   (void)mark;
   (void)have_mark;
 
-  memcpy(hash, hash_questions(header, (unsigned int)qsize, daemon->namebuff), HASH_SIZE);
+  if (!(hashp = hash_questions(header, (unsigned int)qsize, daemon->namebuff)))
+    return 0;
+
+  memcpy(hash, hashp, HASH_SIZE);
   
   while (1) 
     {
@@ -1738,7 +1809,7 @@ static ssize_t tcp_talk(int first, int last, int start, unsigned char *packet,
 	 someone might be attempting to insert bogus values into the cache by 
 	 sending replies containing questions and bogus answers. 
 	 Try another server, or give up */
-      if (memcmp(hash, hash_questions(header, rsize, daemon->namebuff), HASH_SIZE) != 0)
+      if (!(hashp = hash_questions(header, rsize, daemon->namebuff)) || memcmp(hash, hashp, HASH_SIZE) != 0)
 	continue;
       
       serv->flags |= SERV_GOT_TCP;
@@ -1807,8 +1878,8 @@ static int tcp_key_recurse(time_t now, int status, struct dns_header *header, si
       log_save = daemon->log_display_id;
       daemon->log_display_id = ++daemon->log_id;
       
-      log_query_mysockaddr(F_NOEXTRA | F_DNSSEC, keyname, &server->addr,
-			   querystr("dnssec-query", STAT_ISEQUAL(new_status, STAT_NEED_KEY) ? T_DNSKEY : T_DS));
+      log_query_mysockaddr(F_NOEXTRA | F_DNSSEC | F_SERVER, keyname, &server->addr,
+			    STAT_ISEQUAL(status, STAT_NEED_KEY) ? "dnssec-query[DNSKEY]" : "dnssec-query[DS]", 0);
             
       new_status = tcp_key_recurse(now, new_status, new_header, m, class, name, keyname, server, have_mark, mark, keycount);
 
@@ -1842,7 +1913,7 @@ unsigned char *tcp_request(int confd, time_t now,
   int local_auth = 0;
 #endif
   int checking_disabled, do_bit, added_pheader = 0, have_pseudoheader = 0;
-  int check_subnet, cacheable, no_cache_dnssec = 0, cache_secure = 0, bogusanswer = 0;
+  int cacheable, no_cache_dnssec = 0, cache_secure = 0, bogusanswer = 0;
   size_t m;
   unsigned short qtype;
   unsigned int gotname;
@@ -1864,7 +1935,7 @@ unsigned char *tcp_request(int confd, time_t now,
   int first, last;
   unsigned int flags = 0;
     
-  if (getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) == -1)
+  if (!packet || getpeername(confd, (struct sockaddr *)&peer_addr, &peer_len) == -1)
     return packet;
 
 #ifdef HAVE_CONNTRACK
@@ -1907,7 +1978,8 @@ unsigned char *tcp_request(int confd, time_t now,
 	}
       if (!addr)
 	{
-	  my_syslog(LOG_WARNING, _("Ignoring query from non-local network"));
+	  prettyprint_addr(&peer_addr, daemon->addrbuff);
+	  my_syslog(LOG_WARNING, _("ignoring query from non-local network %s"), daemon->addrbuff);
 	  return packet;
 	}
     }
@@ -1946,11 +2018,10 @@ unsigned char *tcp_request(int confd, time_t now,
 #ifdef HAVE_AUTH
 	  struct auth_zone *zone;
 #endif
-	  char *types = querystr(auth_dns ? "auth" : "query", qtype);
-	  
+
 	  log_query_mysockaddr(F_QUERY | F_FORWARD, daemon->namebuff,
-			       &peer_addr, types);
-	  
+			       &peer_addr, auth_dns ? "auth" : "query", qtype);
+
 #ifdef HAVE_CONNTRACK
 	  is_single_query = 1;
 #endif
@@ -2060,7 +2131,7 @@ unsigned char *tcp_request(int confd, time_t now,
 		  else
 		    start = master->last_server;
 		  
-		  size = add_edns0_config(header, size, ((unsigned char *) header) + 65536, &peer_addr, now, &check_subnet, &cacheable);
+		  size = add_edns0_config(header, size, ((unsigned char *) header) + 65536, &peer_addr, now, &cacheable);
 		  
 #ifdef HAVE_DNSSEC
 		  if (option_bool(OPT_DNSSEC_VALID) && (master->flags & SERV_DO_DNSSEC))
@@ -2089,7 +2160,7 @@ unsigned char *tcp_request(int confd, time_t now,
 		  /* get query name again for logging - may have been overwritten */
 		  if (!(gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype)))
 		    strcpy(daemon->namebuff, "query");
-		  log_query_mysockaddr(F_SERVER | F_FORWARD, daemon->namebuff, &serv->addr, NULL);
+		  log_query_mysockaddr(F_SERVER | F_FORWARD, daemon->namebuff, &serv->addr, NULL, 0);
 		  
 #ifdef HAVE_DNSSEC
 		  if (option_bool(OPT_DNSSEC_VALID) && !checking_disabled && (master->flags & SERV_DO_DNSSEC))
@@ -2121,7 +2192,7 @@ unsigned char *tcp_request(int confd, time_t now,
 			    domain = daemon->namebuff;
 			}
 		      
-		      log_query(F_SECSTAT, domain, &a, result);
+		      log_query(F_SECSTAT, domain, &a, result, 0);
 		    }
 #endif
 		  
@@ -2138,7 +2209,7 @@ unsigned char *tcp_request(int confd, time_t now,
 		  
 		  m = process_reply(header, now, serv, (unsigned int)m, 
 				    option_bool(OPT_NO_REBIND) && !norebind, no_cache_dnssec, cache_secure, bogusanswer,
-				    ad_reqd, do_bit, added_pheader, check_subnet, &peer_addr, ((unsigned char *)header) + 65536, ede); 
+				    ad_reqd, do_bit, added_pheader, &peer_addr, ((unsigned char *)header) + 65536, ede); 
 		}
 	    }
 	}
@@ -2276,7 +2347,7 @@ int allocate_rfd(struct randfd_list **fdlp, struct server *serv)
 	  }
       }
 
-  if (j == daemon->numrrand)
+  if (!rfd) /* should be when j == daemon->numrrand */
     {
       struct randfd_list *rfl_poll;
 
@@ -2504,28 +2575,29 @@ static struct frec *lookup_frec(unsigned short id, int fd, void *hash, int *firs
   struct server *s;
   int first, last;
   struct randfd_list *fdl;
-  
-  for(f = daemon->frec_list; f; f = f->next)
-    if (f->sentto && f->new_id == id && 
-	(memcmp(hash, f->hash, HASH_SIZE) == 0))
-      {
-	filter_servers(f->sentto->arrayposn, F_SERVER, firstp, lastp);
 
-	/* sent from random port */
-	for (fdl = f->rfds; fdl; fdl = fdl->next)
-	  if (fdl->rfd->fd == fd)
-	  return f;
-	
-	/* Sent to upstream from socket associated with a server. 
-	   Note we have to iterate over all the possible servers, since they may
-	   have different bound sockets. */
-	for (first = *firstp, last = *lastp; first != last; first++)
-	  {
-	    s = daemon->serverarray[first];
-	    if (s->sfd && s->sfd->fd == fd)
+  if (hash)
+    for (f = daemon->frec_list; f; f = f->next)
+      if (f->sentto && f->new_id == id && 
+	  (memcmp(hash, f->hash, HASH_SIZE) == 0))
+	{
+	  filter_servers(f->sentto->arrayposn, F_SERVER, firstp, lastp);
+	  
+	  /* sent from random port */
+	  for (fdl = f->rfds; fdl; fdl = fdl->next)
+	    if (fdl->rfd->fd == fd)
 	      return f;
-	  }
-      }
+	  
+	  /* Sent to upstream from socket associated with a server. 
+	     Note we have to iterate over all the possible servers, since they may
+	     have different bound sockets. */
+	  for (first = *firstp, last = *lastp; first != last; first++)
+	    {
+	      s = daemon->serverarray[first];
+	      if (s->sfd && s->sfd->fd == fd)
+		return f;
+	    }
+	}
   
   return NULL;
 }
@@ -2534,15 +2606,47 @@ static struct frec *lookup_frec_by_query(void *hash, unsigned int flags, unsigne
 {
   struct frec *f;
 
-  for(f = daemon->frec_list; f; f = f->next)
-    if (f->sentto &&
-	(f->flags & flagmask) == flags &&
-	memcmp(hash, f->hash, HASH_SIZE) == 0)
-      return f;
+  if (hash)
+    for (f = daemon->frec_list; f; f = f->next)
+      if (f->sentto &&
+	  (f->flags & flagmask) == flags &&
+	  memcmp(hash, f->hash, HASH_SIZE) == 0)
+	return f;
   
   return NULL;
 }
 
+#ifdef HAVE_DNSSEC
+/* DNSSEC frecs have the complete query in the block stash.
+   Search for an existing query using that. */
+static struct frec *lookup_frec_dnssec(char *target, int class, int flags, struct dns_header *header)
+{
+   struct frec *f;
+
+   for (f = daemon->frec_list; f; f = f->next)
+     if (f->sentto &&
+	 (f->flags & flags) &&
+	 blockdata_retrieve(f->stash, f->stash_len, (void *)header))
+       {
+	 unsigned char *p = (unsigned char *)(header+1);
+	 int hclass;
+
+	 if (extract_name(header, f->stash_len, &p, target, 0, 4) != 1)
+	   continue;
+
+	 p += 2;  /* type, known from flags */ 
+	 GETSHORT(hclass, p);
+
+	 if (class != hclass)
+	   continue;
+
+	 return f;
+       }
+
+   return NULL;
+}
+#endif
+
 /* Send query packet again, if we can. */
 void resend_query()
 {

src/hash-questions.c

@@ -55,7 +55,7 @@ unsigned char *hash_questions(struct dns_header *header, size_t plen, char *name
       char *cp, c;
 
       if (!extract_name(header, plen, &p, name, 1, 4))
-	break; /* bad packet */
+	return NULL; /* bad packet */
 
       for (cp = name; (c = *cp); cp++)
 	 if (c >= 'A' && c <= 'Z')
@@ -67,7 +67,7 @@ unsigned char *hash_questions(struct dns_header *header, size_t plen, char *name
 
       p += 4;
       if (!CHECK_LEN(header, p, plen, 0))
-	break; /* bad packet */
+	return NULL; /* bad packet */
     }
   
   hash->digest(ctx, hash->digest_size, digest);
@@ -109,7 +109,7 @@ unsigned char *hash_questions(struct dns_header *header, size_t plen, char *name
       char *cp, c;
 
       if (!extract_name(header, plen, &p, name, 1, 4))
-	break; /* bad packet */
+	return NULL; /* bad packet */
 
       for (cp = name; (c = *cp); cp++)
 	 if (c >= 'A' && c <= 'Z')
@@ -121,7 +121,7 @@ unsigned char *hash_questions(struct dns_header *header, size_t plen, char *name
 
       p += 4;
       if (!CHECK_LEN(header, p, plen, 0))
-	break; /* bad packet */
+	return NULL; /* bad packet */
     }
   
   sha256_final(&ctx, digest);

src/helper.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -233,8 +233,13 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 	  is6 = (data.flags != AF_INET);
 	  data.action = ACTION_ARP;
 	}
-       else 
-	continue;
+       else if (data.action == ACTION_RELAY_SNOOP)
+	 {
+	   is6 = 1;
+	   action_str = "relay-snoop";
+	 }
+       else
+	 continue;
       	
       /* stringify MAC into dhcp_buff */
       p = daemon->dhcp_buff;
@@ -286,7 +291,7 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 	  char *dot;
 	  hostname = (char *)buf;
 	  hostname[data.hostname_len - 1] = 0;
-	  if (data.action != ACTION_TFTP)
+	  if (data.action != ACTION_TFTP && data.action != ACTION_RELAY_SNOOP)
 	    {
 	      if (!legal_hostname(hostname))
 		hostname = NULL;
@@ -332,6 +337,24 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 		  lua_call(lua, 2, 0);	/* pass 2 values, expect 0 */
 		}
 	    }
+	  else if (data.action == ACTION_RELAY_SNOOP)
+	    {
+	      lua_getglobal(lua, "snoop"); 
+	      if (lua_type(lua, -1) != LUA_TFUNCTION)
+		lua_pop(lua, 1); /* tftp function optional */
+	      else
+		{
+		  lua_pushstring(lua, action_str); /* arg1 - action */
+		  lua_newtable(lua);               /* arg2 - data table */
+		  lua_pushstring(lua, daemon->addrbuff);
+		  lua_setfield(lua, -2, "client_address");
+		  lua_pushstring(lua, hostname);
+		  lua_setfield(lua, -2, "prefix"); 
+		  lua_pushstring(lua, data.interface);
+		  lua_setfield(lua, -2, "client_interface");
+		  lua_call(lua, 2, 0);	/* pass 2 values, expect 0 */
+		}
+	    }
 	  else if (data.action == ACTION_ARP)
 	    {
 	      lua_getglobal(lua, "arp"); 
@@ -432,8 +455,8 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 		buf = grab_extradata_lua(buf, end, "relay_address");
 	      else if (data.giaddr.s_addr != 0)
 		{
-		  inet_ntop(AF_INET, &data.giaddr, daemon->addrbuff, ADDRSTRLEN);
-		  lua_pushstring(lua, daemon->addrbuff);
+		  inet_ntop(AF_INET, &data.giaddr, daemon->dhcp_buff2, ADDRSTRLEN);
+		  lua_pushstring(lua, daemon->dhcp_buff2);
 		  lua_setfield(lua, -2, "relay_address");
 		}
 	      
@@ -553,7 +576,7 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 	  close(pipeout[1]);
 	}
       
-      if (data.action != ACTION_TFTP && data.action != ACTION_ARP)
+      if (data.action != ACTION_TFTP && data.action != ACTION_ARP && data.action != ACTION_RELAY_SNOOP)
 	{
 #ifdef HAVE_DHCP6
 	  my_setenv("DNSMASQ_IAID", is6 ? daemon->dhcp_buff3 : NULL, &err);
@@ -615,7 +638,7 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 	    {
 	      const char *giaddr = NULL;
 	      if (data.giaddr.s_addr != 0)
-		  giaddr = inet_ntop(AF_INET, &data.giaddr, daemon->addrbuff, ADDRSTRLEN);
+		  giaddr = inet_ntop(AF_INET, &data.giaddr, daemon->dhcp_buff2, ADDRSTRLEN);
 	      my_setenv("DNSMASQ_RELAY_ADDRESS", giaddr, &err);
 	    }
 	  
@@ -640,6 +663,9 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
 	fcntl(event_fd, F_SETFD, i | FD_CLOEXEC);
       close(pipefd[0]);
 
+      if (data.action == ACTION_RELAY_SNOOP)
+	strcpy(daemon->packet, data.interface);
+      
       p =  strrchr(daemon->lease_change_command, '/');
       if (err == 0)
 	{
@@ -810,6 +836,29 @@ void queue_script(int action, struct dhcp_lease *lease, char *hostname, time_t n
   bytes_in_buf = p - (unsigned char *)buf;
 }
 
+#ifdef HAVE_DHCP6
+void queue_relay_snoop(struct in6_addr *client, int if_index, struct in6_addr *prefix, int prefix_len)
+{
+  /* no script */
+  if (daemon->helperfd == -1)
+    return;
+  
+  inet_ntop(AF_INET6, prefix, daemon->addrbuff, ADDRSTRLEN);
+
+  /* 5 for /nnn and zero on the end of the prefix. */
+  buff_alloc(sizeof(struct script_data) + ADDRSTRLEN + 5);
+  memset(buf, 0, sizeof(struct script_data));
+
+  buf->action = ACTION_RELAY_SNOOP;
+  buf->addr6 = *client;
+  buf->hostname_len = sprintf((char *)(buf+1), "%s/%u", daemon->addrbuff, prefix_len) + 1;
+  
+  indextoname(daemon->dhcp6fd, if_index, buf->interface);
+
+  bytes_in_buf = sizeof(struct script_data) + buf->hostname_len;
+}
+#endif
+
 #ifdef HAVE_TFTP
 /* This nastily re-uses DHCP-fields for TFTP stuff */
 void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer)

src/inotify.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
  
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -148,12 +148,19 @@ void set_dynamic_inotify(int flag, int total_size, struct crec **rhash, int revh
       if (!(ah->flags & flag))
 	continue;
  
-      if (stat(ah->fname, &buf) == -1 || !(S_ISDIR(buf.st_mode)))
+      if (stat(ah->fname, &buf) == -1)
 	{
 	  my_syslog(LOG_ERR, _("bad dynamic directory %s: %s"), 
 		    ah->fname, strerror(errno));
 	  continue;
 	}
+
+      if (!(S_ISDIR(buf.st_mode)))
+	{
+	  my_syslog(LOG_ERR, _("bad dynamic directory %s: %s"), 
+		    ah->fname, _("not a directory"));
+	  continue;
+	}
       
        if (!(ah->flags & AH_WD_DONE))
 	 {

src/ip6addr.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/lease.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/log.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -100,10 +100,23 @@ int log_start(struct passwd *ent_pw, int errfd)
   /* If we're running as root and going to change uid later,
      change the ownership here so that the file is always owned by
      the dnsmasq user. Then logrotate can just copy the owner.
-     Failure of the chown call is OK, (for instance when started as non-root) */
-  if (log_to_file && !log_stderr && ent_pw && ent_pw->pw_uid != 0 && 
-      fchown(log_fd, ent_pw->pw_uid, -1) != 0)
-    ret = errno;
+     Failure of the chown call is OK, (for instance when started as non-root).
+     
+     If we've created a file with group-id root, we also make
+     the file group-writable. This gives processes in the root group
+     write access to the file and avoids the problem that on some systems,
+     once the file is owned by the dnsmasq user, it can't be written
+     whilst dnsmasq is running as root during startup.
+ */
+  if (log_to_file && !log_stderr && ent_pw && ent_pw->pw_uid != 0)
+    {
+      struct stat ls;
+      if (getgid() == 0 && fstat(log_fd, &ls) == 0 && ls.st_gid == 0 &&
+	  (ls.st_mode & S_IWGRP) == 0)
+	(void)fchmod(log_fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
+      if (fchown(log_fd, ent_pw->pw_uid, -1) != 0)
+	ret = errno;
+    }
 
   return ret;
 }
@@ -118,7 +131,7 @@ int log_reopen(char *log_file)
       /* NOTE: umask is set to 022 by the time this gets called */
       
       if (log_file)
-	log_fd = open(log_file, O_WRONLY|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR|S_IRGRP);      
+	log_fd = open(log_file, O_WRONLY|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR|S_IRGRP);
       else
 	{
 #if defined(HAVE_SOLARIS_NETWORK) || defined(__ANDROID__)

src/loop.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/metrics.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/metrics.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/netlink.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -66,17 +66,10 @@ char *netlink_init(void)
   addr.nl_pad = 0;
   addr.nl_pid = 0; /* autobind */
   addr.nl_groups = RTMGRP_IPV4_ROUTE;
-  if (option_bool(OPT_CLEVERBIND))
-    addr.nl_groups |= RTMGRP_IPV4_IFADDR;  
+  addr.nl_groups |= RTMGRP_IPV4_IFADDR;  
   addr.nl_groups |= RTMGRP_IPV6_ROUTE;
-  if (option_bool(OPT_CLEVERBIND))
-    addr.nl_groups |= RTMGRP_IPV6_IFADDR;
+  addr.nl_groups |= RTMGRP_IPV6_IFADDR;
 
-#ifdef HAVE_DHCP6
-  if (daemon->doing_ra || daemon->doing_dhcp6)
-    addr.nl_groups |= RTMGRP_IPV6_IFADDR;
-#endif
-  
   /* May not be able to have permission to set multicast groups don't die in that case */
   if ((daemon->netlinkfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) != -1)
     {

src/network.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -114,13 +114,8 @@ int iface_check(int family, union all_addr *addr, char *name, int *auth)
   struct iname *tmp;
   int ret = 1, match_addr = 0;
 
-  /* Note: have to check all and not bail out early, so that we set the
-     "used" flags.
-
-     May be called with family == AF_LOCALto check interface by name only. */
-  
-  if (auth)
-    *auth = 0;
+  /* Note: have to check all and not bail out early, so that we set the "used" flags.
+     May be called with family == AF_LOCAL to check interface by name only. */
   
   if (daemon->if_names || daemon->if_addrs)
     {
@@ -149,25 +144,29 @@ int iface_check(int family, union all_addr *addr, char *name, int *auth)
       if (tmp->name && wildcard_match(tmp->name, name))
 	ret = 0;
     
-
-  for (tmp = daemon->authinterface; tmp; tmp = tmp->next)
-    if (tmp->name)
-      {
-	if (strcmp(tmp->name, name) == 0 &&
-	    (tmp->addr.sa.sa_family == 0 || tmp->addr.sa.sa_family == family))
-	  break;
-      }
-    else if (addr && tmp->addr.sa.sa_family == AF_INET && family == AF_INET &&
-	     tmp->addr.in.sin_addr.s_addr == addr->addr4.s_addr)
-      break;
-    else if (addr && tmp->addr.sa.sa_family == AF_INET6 && family == AF_INET6 &&
-	     IN6_ARE_ADDR_EQUAL(&tmp->addr.in6.sin6_addr, &addr->addr6))
-      break;
-
-  if (tmp && auth) 
+  if (auth)
     {
-      *auth = 1;
-      ret = 1;
+      *auth = 0;
+
+      for (tmp = daemon->authinterface; tmp; tmp = tmp->next)
+	if (tmp->name)
+	  {
+	    if (strcmp(tmp->name, name) == 0 &&
+		(tmp->addr.sa.sa_family == 0 || tmp->addr.sa.sa_family == family))
+	      break;
+	  }
+	else if (addr && tmp->addr.sa.sa_family == AF_INET && family == AF_INET &&
+		 tmp->addr.in.sin_addr.s_addr == addr->addr4.s_addr)
+	  break;
+	else if (addr && tmp->addr.sa.sa_family == AF_INET6 && family == AF_INET6 &&
+		 IN6_ARE_ADDR_EQUAL(&tmp->addr.in6.sin6_addr, &addr->addr6))
+	  break;
+      
+      if (tmp) 
+	{
+	  *auth = 1;
+	  ret = 1;
+	}
     }
 
   return ret; 
@@ -1586,6 +1585,9 @@ void check_servers(int no_loop_check)
       if (serv->sfd)
 	serv->sfd->used = 1;
       
+      if (count == SERVERS_LOGGED)
+	my_syslog(LOG_INFO, _("more servers are defined but not logged"));
+      
       if (++count > SERVERS_LOGGED)
 	continue;
       
@@ -1623,7 +1625,8 @@ void check_servers(int no_loop_check)
 	 continue;
        
        if ((serv->flags & SERV_LITERAL_ADDRESS) &&
-	   !(serv->flags & (SERV_6ADDR | SERV_4ADDR | SERV_ALL_ZEROS)))
+	   !(serv->flags & (SERV_6ADDR | SERV_4ADDR | SERV_ALL_ZEROS)) &&
+	   strlen(serv->domain))
 	 {
 	   count--;
 	   if (++locals <= LOCALS_LOGGED)
@@ -1739,6 +1742,8 @@ int reload_servers(char *fname)
 /* Called when addresses are added or deleted from an interface */
 void newaddress(time_t now)
 {
+  struct dhcp_relay *relay;
+
   (void)now;
   
   if (option_bool(OPT_CLEVERBIND) || option_bool(OPT_LOCAL_SERVICE) ||
@@ -1747,6 +1752,12 @@ void newaddress(time_t now)
   
   if (option_bool(OPT_CLEVERBIND))
     create_bound_listeners(0);
+
+#ifdef HAVE_DHCP
+  /* clear cache of subnet->relay index */
+  for (relay = daemon->relay4; relay; relay = relay->next)
+    relay->iface_index = 0;
+#endif
   
 #ifdef HAVE_DHCP6
   if (daemon->doing_dhcp6 || daemon->relay6 || daemon->doing_ra)
@@ -1757,5 +1768,8 @@ void newaddress(time_t now)
   
   if (daemon->doing_dhcp6)
     lease_find_interfaces(now);
+
+  for (relay = daemon->relay6; relay; relay = relay->next)
+    relay->iface_index = 0;
 #endif
 }

src/nftset.c

@@ -0,0 +1,94 @@
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 dated June, 1991, or
+   (at your option) version 3 dated 29 June, 2007.
+ 
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+     
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#include "dnsmasq.h"
+
+#if defined (HAVE_NFTSET) && defined (HAVE_LINUX_NETWORK)
+
+#include <nftables/libnftables.h>
+
+#include <string.h>
+#include <arpa/inet.h>
+
+static struct nft_ctx *ctx = NULL;
+static const char *cmd_add = "add element %s { %s }";
+static const char *cmd_del = "delete element %s { %s }";
+
+void nftset_init()
+{
+  ctx = nft_ctx_new(NFT_CTX_DEFAULT);
+  if (ctx == NULL)
+    die(_("failed to create nftset context"), NULL, EC_MISC);
+
+  /* disable libnftables output */
+  nft_ctx_buffer_error(ctx);
+}
+
+int add_to_nftset(const char *setname, const union all_addr *ipaddr, int flags, int remove)
+{
+  const char *cmd = remove ? cmd_del : cmd_add;
+  int ret, af = (flags & F_IPV4) ? AF_INET : AF_INET6;
+  size_t new_sz;
+  char *new, *err, *nl;
+  static char *cmd_buf = NULL;
+  static size_t cmd_buf_sz = 0;
+
+  inet_ntop(af, ipaddr, daemon->addrbuff, ADDRSTRLEN);
+
+  if (setname[1] == ' ' && (setname[0] == '4' || setname[0] == '6'))
+    {
+      if (setname[0] == '4' && !(flags & F_IPV4))
+	return -1;
+
+      if (setname[0] == '6' && !(flags & F_IPV6))
+	return -1;
+
+      setname += 2;
+    }
+  
+  if (cmd_buf_sz == 0)
+    new_sz = 150; /* initial allocation */
+  else
+    new_sz = snprintf(cmd_buf, cmd_buf_sz, cmd, setname, daemon->addrbuff);
+  
+  if (new_sz > cmd_buf_sz)
+    {
+      if (!(new = whine_malloc(new_sz + 10)))
+	return 0;
+
+      if (cmd_buf)
+	free(cmd_buf);
+      cmd_buf = new;
+      cmd_buf_sz = new_sz + 10;
+      snprintf(cmd_buf, cmd_buf_sz, cmd, setname, daemon->addrbuff);
+    }
+
+  ret = nft_run_cmd_from_buffer(ctx, cmd_buf);
+  err = (char *)nft_ctx_get_error_buffer(ctx);
+
+  if (ret != 0)
+    {
+      /* Log only first line of error return. */
+      if ((nl = strchr(err, '\n')))
+	*nl = 0;
+      my_syslog(LOG_ERR,  "nftset %s %s", setname, err);
+    }
+  
+  return ret;
+}
+
+#endif

src/option.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -174,7 +174,14 @@ struct myoption {
 #define LOPT_CMARK_ALST_EN 365
 #define LOPT_CMARK_ALST    366
 #define LOPT_QUIET_TFTP    367
- 
+#define LOPT_NFTSET        368
+#define LOPT_FILTER_A      369
+#define LOPT_FILTER_AAAA   370
+#define LOPT_STRIP_SBNET   371
+#define LOPT_STRIP_MAC     372
+#define LOPT_CONF_OPT      373
+#define LOPT_CONF_SCRIPT   374
+
 #ifdef HAVE_GETOPT_LONG
 static const struct option opts[] =  
 #else
@@ -211,6 +218,8 @@ static const struct myoption opts[] =
     { "ignore-address", 1, 0, LOPT_IGNORE_ADDR },
     { "selfmx", 0, 0, 'e' },
     { "filterwin2k", 0, 0, 'f' },
+    { "filter-A", 0, 0, LOPT_FILTER_A },
+    { "filter-AAAA", 0, 0, LOPT_FILTER_AAAA },
     { "pid-file", 2, 0, 'x' },
     { "strict-order", 0, 0, 'o' },
     { "server", 1, 0, 'S' },
@@ -218,6 +227,7 @@ static const struct myoption opts[] =
     { "local", 1, 0, LOPT_LOCAL },
     { "address", 1, 0, 'A' },
     { "conf-file", 2, 0, 'C' },
+    { "conf-script", 1, 0, LOPT_CONF_SCRIPT },
     { "no-resolv", 0, 0, 'R' },
     { "expand-hosts", 0, 0, 'E' },
     { "localmx", 0, 0, 'L' },
@@ -309,7 +319,9 @@ static const struct myoption opts[] =
     { "dhcp-generate-names", 2, 0, LOPT_GEN_NAMES },
     { "rebind-localhost-ok", 0, 0,  LOPT_LOC_REBND },
     { "add-mac", 2, 0, LOPT_ADD_MAC },
+    { "strip-mac", 0, 0, LOPT_STRIP_MAC },
     { "add-subnet", 2, 0, LOPT_ADD_SBNET },
+    { "strip-subnet", 0, 0, LOPT_STRIP_SBNET },
     { "add-cpe-id", 1, 0 , LOPT_CPE_ID },
     { "proxy-dnssec", 0, 0, LOPT_DNSSEC },
     { "dhcp-sequential-ip", 0, 0,  LOPT_INCR_ADDR },
@@ -327,6 +339,7 @@ static const struct myoption opts[] =
     { "auth-sec-servers", 1, 0, LOPT_AUTHSFS },
     { "auth-peer", 1, 0, LOPT_AUTHPEER }, 
     { "ipset", 1, 0, LOPT_IPSET },
+    { "nftset", 1, 0, LOPT_NFTSET },
     { "connmark-allowlist-enable", 2, 0, LOPT_CMARK_ALST_EN },
     { "connmark-allowlist", 1, 0, LOPT_CMARK_ALST },
     { "synth-domain", 1, 0, LOPT_SYNTH },
@@ -351,7 +364,7 @@ static const struct myoption opts[] =
     { "dhcp-ignore-clid", 0, 0,  LOPT_IGNORE_CLID },
     { "dynamic-host", 1, 0, LOPT_DYNHOST },
     { "log-debug", 0, 0, LOPT_LOG_DEBUG },
-	{ "umbrella", 2, 0, LOPT_UMBRELLA },
+    { "umbrella", 2, 0, LOPT_UMBRELLA },
     { "quiet-tftp", 0, 0, LOPT_QUIET_TFTP },
     { NULL, 0, 0, 0 }
   };
@@ -380,6 +393,8 @@ static struct {
   { 'e', OPT_SELFMX, NULL, gettext_noop("Return self-pointing MX records for local hosts."), NULL },
   { 'E', OPT_EXPAND, NULL, gettext_noop("Expand simple names in /etc/hosts with domain-suffix."), NULL },
   { 'f', OPT_FILTER, NULL, gettext_noop("Don't forward spurious DNS requests from Windows hosts."), NULL },
+  { LOPT_FILTER_A, OPT_FILTER_A, NULL, gettext_noop("Don't include IPv4 addresses in DNS answers."), NULL },
+  { LOPT_FILTER_AAAA, OPT_FILTER_AAAA, NULL, gettext_noop("Don't include IPv6 addresses in DNS answers."), NULL },
   { 'F', ARG_DUP, "<ipaddr>,...", gettext_noop("Enable DHCP in the range given with lease duration."), NULL },
   { 'g', ARG_ONE, "<groupname>", gettext_noop("Change to this group after startup (defaults to %s)."), CHGRP },
   { 'G', ARG_DUP, "<hostspec>", gettext_noop("Set address or hostname for a specified machine."), NULL },
@@ -455,6 +470,7 @@ static struct {
   { LOPT_SCRIPTUSR, ARG_ONE, "<username>", gettext_noop("Run lease-change scripts as this user."), NULL },
   { LOPT_SCRIPT_ARP, OPT_SCRIPT_ARP, NULL, gettext_noop("Call dhcp-script with changes to local ARP table."), NULL },
   { '7', ARG_DUP, "<path>", gettext_noop("Read configuration from all the files in this directory."), NULL },
+  { LOPT_CONF_SCRIPT, ARG_DUP, "<path>", gettext_noop("Execute file and read configuration from stdin."), NULL },
   { '8', ARG_ONE, "<facility>|<file>", gettext_noop("Log to this syslog facility or file. (defaults to DAEMON)"), NULL },
   { '9', OPT_LEASE_RO, NULL, gettext_noop("Do not use leasefile."), NULL },
   { '0', ARG_ONE, "<integer>", gettext_noop("Maximum number of concurrent DNS queries. (defaults to %s)"), "!" }, 
@@ -493,7 +509,9 @@ static struct {
   { LOPT_PXE_SERV, ARG_DUP, "<service>", gettext_noop("Boot service for PXE menu."), NULL },
   { LOPT_TEST, 0, NULL, gettext_noop("Check configuration syntax."), NULL },
   { LOPT_ADD_MAC, ARG_DUP, "[=base64|text]", gettext_noop("Add requestor's MAC address to forwarded DNS queries."), NULL },
+  { LOPT_STRIP_MAC, OPT_STRIP_MAC, NULL, gettext_noop("Strip MAC information from queries."), NULL },
   { LOPT_ADD_SBNET, ARG_ONE, "<v4 pref>[,<v6 pref>]", gettext_noop("Add specified IP subnet to forwarded DNS queries."), NULL },
+  { LOPT_STRIP_SBNET, OPT_STRIP_ECS, NULL, gettext_noop("Strip ECS information from queries."), NULL },
   { LOPT_CPE_ID, ARG_ONE, "<text>", gettext_noop("Add client identification to forwarded DNS queries."), NULL },
   { LOPT_DNSSEC, OPT_DNSSEC_PROXY, NULL, gettext_noop("Proxy DNSSEC validation results from upstream nameservers."), NULL },
   { LOPT_INCR_ADDR, OPT_CONSEC_ADDR, NULL, gettext_noop("Attempt to allocate sequential IP addresses to DHCP clients."), NULL },
@@ -514,6 +532,7 @@ static struct {
   { LOPT_AUTHSFS, ARG_DUP, "<NS>[,<NS>...]", gettext_noop("Secondary authoritative nameservers for forward domains"), NULL },
   { LOPT_AUTHPEER, ARG_DUP, "<ipaddr>[,<ipaddr>...]", gettext_noop("Peers which are allowed to do zone transfer"), NULL },
   { LOPT_IPSET, ARG_DUP, "/<domain>[/<domain>...]/<ipset>...", gettext_noop("Specify ipsets to which matching domains should be added"), NULL },
+  { LOPT_NFTSET, ARG_DUP, "/<domain>[/<domain>...]/<nftset>...", gettext_noop("Specify nftables sets to which matching domains should be added"), NULL },
   { LOPT_CMARK_ALST_EN, ARG_ONE, "[=<mask>]", gettext_noop("Enable filtering of DNS queries with connection-track marks."), NULL },
   { LOPT_CMARK_ALST, ARG_DUP, "<connmark>[/<mask>][,<pattern>[/<pattern>...]]", gettext_noop("Set allowed DNS patterns for a connection-track mark."), NULL },
   { LOPT_SYNTH, ARG_DUP, "<domain>,<range>,[<prefix>]", gettext_noop("Specify a domain and address range for synthesised names"), NULL },
@@ -654,7 +673,7 @@ static char *canonicalise_opt(char *s)
     return 0;
 
   if (strlen(s) == 0)
-    return opt_string_alloc("");
+    return opt_malloc(1); /* Heap-allocated empty string */
 
   unhide_metas(s);
   if (!(ret = canonicalise(s, &nomem)) && nomem)
@@ -798,7 +817,7 @@ static void do_usage(void)
 	     
       if (usage[i].arg)
 	{
-	  strcpy(buff, usage[i].arg);
+	  safe_strncpy(buff, usage[i].arg, sizeof(buff));
 	  for (j = 0; tab[j].handle; j++)
 	    if (tab[j].handle == *(usage[i].arg))
 	      sprintf(buff, "%d", tab[j].val);
@@ -935,52 +954,124 @@ char *parse_server(char *arg, union mysockaddr *addr, union mysockaddr *source_a
   return NULL;
 }
 
-static int domain_rev4(char *domain, struct in_addr addr, int msize)
+static char *domain_rev4(int from_file, char *server, struct in_addr *addr4, int size)
 {
-  in_addr_t a = ntohl(addr.s_addr);
- 
-  *domain = 0;
+  int i, j;
+  char *string;
+  int msize;
+  u16 flags = 0;
+  char domain[29]; /* strlen("xxx.yyy.zzz.ttt.in-addr.arpa")+1 */
+  union mysockaddr serv_addr, source_addr;
+  char interface[IF_NAMESIZE+1];
+  int count = 1, rem, addrbytes, addrbits;
   
-  switch (msize)
+  if (!server)
+    flags = SERV_LITERAL_ADDRESS;
+  else if ((string = parse_server(server, &serv_addr, &source_addr, interface, &flags)))
+    return string;
+
+  if (from_file)
+    flags |= SERV_FROM_FILE;
+
+  rem = size & 0x7;
+  addrbytes = (32 - size) >> 3;
+  addrbits = (32 - size) & 7;
+  
+  if (size > 32 || size < 1)
+    return _("bad IPv4 prefix length");
+
+  /* Zero out last address bits according to CIDR mask */
+  ((u8 *)addr4)[3-addrbytes] &= ~((1 << addrbits)-1);
+  
+  size = size & ~0x7;
+  
+  if (rem != 0)
+    count = 1 << (8 - rem);
+  
+  for (i = 0; i < count; i++)
     {
-    case 32:
-      domain += sprintf(domain, "%u.", a & 0xff);
-      /* fall through */
-    case 24:
-      domain += sprintf(domain, "%d.", (a >> 8) & 0xff);
-      /* fall through */
-    case 16:
-      domain += sprintf(domain, "%d.", (a >> 16) & 0xff);
-      /* fall through */
-    case 8:
-      domain += sprintf(domain, "%d.", (a >> 24) & 0xff);
-      break;
-    default:
-      return 0;
+      *domain = 0;
+      string = domain;
+      msize = size/8;
+  
+      for (j = (rem == 0) ? msize-1 : msize; j >= 0; j--)
+	{ 
+	  int dig = ((unsigned char *)addr4)[j];
+      
+	  if (j == msize)
+	    dig += i;
+      
+	  string += sprintf(string, "%d.", dig);
+	}
+
+      sprintf(string, "in-addr.arpa");
+
+      if (!add_update_server(flags, &serv_addr, &source_addr, interface, domain, NULL))
+	return  _("error");
     }
-  
-  domain += sprintf(domain, "in-addr.arpa");
-  
-  return 1;
+
+  return NULL;
 }
 
-static int domain_rev6(char *domain, struct in6_addr *addr, int msize)
+static char *domain_rev6(int from_file, char *server, struct in6_addr *addr6, int size)
 {
-  int i;
+  int i, j;
+  char *string;
+  int msize;
+  u16 flags = 0;
+  char domain[73]; /* strlen("32*<n.>ip6.arpa")+1 */
+  union mysockaddr serv_addr, source_addr;
+  char interface[IF_NAMESIZE+1];
+  int count = 1, rem, addrbytes, addrbits;
 
-  if (msize > 128 || msize%4)
-    return 0;
+  if (!server)
+    flags = SERV_LITERAL_ADDRESS;
+  else if ((string = parse_server(server, &serv_addr, &source_addr, interface, &flags)))
+    return string;
+
+  if (from_file)
+    flags |= SERV_FROM_FILE;
   
-  *domain = 0;
+  rem = size & 0x3;
+  addrbytes = (128 - size) >> 3;
+  addrbits = (128 - size) & 7;
+  
+  if (size > 128 || size < 1)
+    return _("bad IPv6 prefix length");
+  
+  /* Zero out last address bits according to CIDR mask */
+  addr6->s6_addr[15-addrbytes] &= ~((1 << addrbits) - 1);
+  
+  size = size & ~0x3;
+  
+  if (rem != 0)
+    count = 1 << (4 - rem);
+      
+  for (i = 0; i < count; i++)
+    {
+      *domain = 0;
+      string = domain;
+      msize = size/4;
+  
+      for (j = (rem == 0) ? msize-1 : msize; j >= 0; j--)
+	{ 
+	  int dig = ((unsigned char *)addr6)[j>>1];
+	  
+	  dig = j & 1 ? dig & 15 : dig >> 4;
+	  
+	  if (j == msize)
+	    dig += i;
+	  
+	  string += sprintf(string, "%.1x.", dig);
+	}
+      
+      sprintf(string, "ip6.arpa");
 
-  for (i = msize-1; i >= 0; i -= 4)
-    { 
-      int dig = ((unsigned char *)addr)[i>>3];
-      domain += sprintf(domain, "%.1x.", (i>>2) & 1 ? dig & 15 : dig >> 4);
+      if (!add_update_server(flags, &serv_addr, &source_addr, interface, domain, NULL))
+	return  _("error");
     }
-  domain += sprintf(domain, "ip6.arpa");
-  
-  return 1;
+
+  return NULL;
 }
 
 #ifdef HAVE_DHCP
@@ -1723,6 +1814,17 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	break;
       }
 
+    case LOPT_CONF_SCRIPT: /* --conf-script */
+      {
+	char *file = opt_string_alloc(arg);
+	if (file)
+	  {
+	    one_file(file, LOPT_CONF_SCRIPT);
+	    free(file);
+	  }
+	break;
+      }
+
     case '7': /* --conf-dir */	      
       {
 	DIR *dir_stream;
@@ -1829,6 +1931,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 		new->next = li;
 		*up = new;
 	      }
+	    else
+	      free(path);
 
 	  }
 
@@ -1995,7 +2099,11 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	
 	if (!(name = canonicalise_opt(arg)) || 
 	    (comma && !(target = canonicalise_opt(comma))))
-	  ret_err(_("bad MX name"));
+	  {
+	    free(name);
+	    free(target);
+	    ret_err(_("bad MX name"));
+	  }
 	
 	new = opt_malloc(sizeof(struct mx_srv_record));
 	new->next = daemon->mxnames;
@@ -2146,8 +2254,10 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	comma = split(arg);
 		
 	new = opt_malloc(sizeof(struct auth_zone));
-	new->domain = opt_string_alloc(arg);
-	new->subnet = NULL;
+	new->domain = canonicalise_opt(arg);
+	if (!new->domain)
+	  ret_err_free(_("invalid auth-zone"), new);
+ 	new->subnet = NULL;
 	new->exclude = NULL;
 	new->interface_names = NULL;
 	new->next = daemon->auth_zones;
@@ -2302,17 +2412,13 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 				      strlen(new->prefix) > MAXLABEL - INET_ADDRSTRLEN)
 				    ret_err_free(_("bad prefix"), new);
 				}
-			      else if (strcmp(arg, "local") != 0 ||
-				       (msize != 8 && msize != 16 && msize != 24))
+			      else if (strcmp(arg, "local") != 0)
 				ret_err_free(gen_err, new);
 			      else
 				{
-				  char domain[29]; /* strlen("xxx.yyy.zzz.ttt.in-addr.arpa")+1 */
 				  /* local=/xxx.yyy.zzz.in-addr.arpa/ */
-				  /* domain_rev4 can't fail here, msize checked above. */
-				  domain_rev4(domain, new->start, msize);
-				  add_update_server(SERV_LITERAL_ADDRESS, NULL, NULL, NULL, domain, NULL);
-				  
+				  domain_rev4(0, NULL, &new->start, msize);
+				 				  
 				  /* local=/<domain>/ */
 				  /* d_raw can't failed to canonicalise here, checked above. */
 				  add_update_server(SERV_LITERAL_ADDRESS, NULL, NULL, NULL, d_raw, NULL);
@@ -2347,16 +2453,14 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 				      strlen(new->prefix) > MAXLABEL - INET6_ADDRSTRLEN)
 				    ret_err_free(_("bad prefix"), new);
 				}	
-			      else if (strcmp(arg, "local") != 0 || ((msize & 4) != 0))
+			      else if (strcmp(arg, "local") != 0)
 				ret_err_free(gen_err, new);
 			      else 
 				{
-				  char domain[73]; /* strlen("32*<n.>ip6.arpa")+1 */
 				  /* generate the equivalent of
 				     local=/xxx.yyy.zzz.ip6.arpa/ */
-				  domain_rev6(domain, &new->start6, msize);
-				  add_update_server(SERV_LITERAL_ADDRESS, NULL, NULL, NULL, domain, NULL);
-
+				  domain_rev6(0, NULL, &new->start6, msize);
+				  
 				  /* local=/<domain>/ */
 				  /* d_raw can't failed to canonicalise here, checked above. */
 				  add_update_server(SERV_LITERAL_ADDRESS, NULL, NULL, NULL, d_raw, NULL);
@@ -2436,39 +2540,48 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 
     case LOPT_UMBRELLA: /* --umbrella */
       set_option_bool(OPT_UMBRELLA);
-      while (arg) {
-        comma = split(arg);
-        if (strstr(arg, "deviceid:")) {
-          arg += 9;
-          if (strlen(arg) != 16)
-              ret_err(gen_err);
-          for (char *p = arg; *p; p++) {
-            if (!isxdigit((int)*p))
-              ret_err(gen_err);
-          }
-          set_option_bool(OPT_UMBRELLA_DEVID);
-
-          u8 *u = daemon->umbrella_device;
-          char word[3];
-          for (u8 i = 0; i < sizeof(daemon->umbrella_device); i++, arg+=2) {
-            memcpy(word, &(arg[0]), 2);
-            *u++ = strtoul(word, NULL, 16);
-          }
-        }
-        else if (strstr(arg, "orgid:")) {
-          if (!strtoul_check(arg+6, &daemon->umbrella_org)) {
-            ret_err(gen_err);
-          }
-        }
-        else if (strstr(arg, "assetid:")) {
-          if (!strtoul_check(arg+8, &daemon->umbrella_asset)) {
-            ret_err(gen_err);
-          }
-        }
-        arg = comma;
-      }
+      while (arg)
+	{
+	  comma = split(arg);
+	  if (strstr(arg, "deviceid:"))
+	    {
+	      char *p;
+	      u8 *u = daemon->umbrella_device;
+	      char word[3];
+	      
+	      arg += 9;
+	      if (strlen(arg) != 16)
+		ret_err(gen_err);
+	      
+	      for (p = arg; *p; p++)
+		if (!isxdigit((int)*p))
+		  ret_err(gen_err);
+	      
+	      set_option_bool(OPT_UMBRELLA_DEVID);
+	      
+	      for (i = 0; i < (int)sizeof(daemon->umbrella_device); i++, arg+=2)
+		{
+		  memcpy(word, &(arg[0]), 2);
+		  *u++ = strtoul(word, NULL, 16);
+		}
+	    }
+	  else if (strstr(arg, "orgid:"))
+	    {
+	      if (!strtoul_check(arg+6, &daemon->umbrella_org))
+		ret_err(gen_err);
+	    }
+	  else if (strstr(arg, "assetid:"))
+	    {
+	      if (!strtoul_check(arg+8, &daemon->umbrella_asset))
+		ret_err(gen_err);
+	    }
+	  else
+	    ret_err(gen_err);
+	  
+	  arg = comma;
+	}
       break;
-
+      
     case LOPT_ADD_MAC: /* --add-mac */
       if (!arg)
 	set_option_bool(OPT_ADD_MAC);
@@ -2635,7 +2748,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
       
     case LOPT_NO_REBIND: /*  --rebind-domain-ok */
       {
-	struct server *new;
+	struct rebind_domain *new;
 
 	unhide_metas(arg);
 
@@ -2644,9 +2757,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	
 	do {
 	  comma = split_chr(arg, '/');
-	  new = opt_malloc(sizeof(struct serv_local));
-	  new->domain = opt_string_alloc(arg);
-	  new->domain_len = strlen(arg);
+	  new = opt_malloc(sizeof(struct  rebind_domain));
+	  new->domain = canonicalise_opt(arg);
 	  new->next = daemon->no_rebind;
 	  daemon->no_rebind = new;
 	  arg = comma;
@@ -2708,11 +2820,18 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	while (1)
 	  {
 	    /* server=//1.2.3.4 is special. */
-	    if (strlen(domain) == 0 && lastdomain)
-	      flags |= SERV_FOR_NODOTS;
-	    else
-	      flags &= ~SERV_FOR_NODOTS;
+	    if (lastdomain)
+	      {
+		if (strlen(domain) == 0)
+		  flags |= SERV_FOR_NODOTS;
+		else
+		  flags &= ~SERV_FOR_NODOTS;
 
+		/* address=/#/ matches the same as without domain */
+		if (option == 'A' && domain[0] == '#' && domain[1] == 0)
+		  domain[0] = 0;
+	      }
+	    
 	    if (!add_update_server(flags, &serv_addr, &source_addr, interface, domain, &addr))
 	      ret_err(gen_err);
 	    
@@ -2729,57 +2848,62 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
       {
 	char *string;
 	int size;
-	u16 flags = 0;
-	char domain[73]; /* strlen("32*<n.>ip6.arpa")+1 */
 	struct in_addr addr4;
 	struct in6_addr addr6;
- 	union mysockaddr serv_addr, source_addr;
-	char interface[IF_NAMESIZE+1];
-	
+ 	
 	unhide_metas(arg);
 	if (!arg)
 	  ret_err(gen_err);
 	
 	comma=split(arg);
-
-	if (!(string = split_chr(arg, '/')) || !atoi_check(string, &size))
-	  ret_err(gen_err);
 	
+	if (!(string = split_chr(arg, '/')) || !atoi_check(string, &size))
+	  size = -1;
+
 	if (inet_pton(AF_INET, arg, &addr4))
 	  {
-	    if (!domain_rev4(domain, addr4, size))
-	      ret_err(_("bad IPv4 prefix"));
+	   if (size == -1)
+	     size = 32;
+
+	   if ((string = domain_rev4(servers_only, comma, &addr4, size)))
+	      ret_err(string);
 	  }
 	else if (inet_pton(AF_INET6, arg, &addr6))
 	  {
-	    if (!domain_rev6(domain, &addr6, size))
-	      ret_err(_("bad IPv6 prefix"));
+	     if (size == -1)
+	       size = 128;
+
+	     if ((string = domain_rev6(servers_only, comma, &addr6, size)))
+	      ret_err(string);
 	  }
 	else
 	  ret_err(gen_err);
 	
-	if (!comma)
-	  flags |= SERV_LITERAL_ADDRESS;
-	else if ((string = parse_server(comma, &serv_addr, &source_addr, interface, &flags)))
-	  ret_err(string);
-	
-	if (servers_only)
-	  flags |= SERV_FROM_FILE;
-
-	if (!add_update_server(flags, &serv_addr, &source_addr, interface, domain, NULL))
-	  ret_err(gen_err);
-	
 	break;
       }
 
     case LOPT_IPSET: /* --ipset */
+    case LOPT_NFTSET: /* --nftset */
 #ifndef HAVE_IPSET
-      ret_err(_("recompile with HAVE_IPSET defined to enable ipset directives"));
-      break;
-#else
+      if (option == LOPT_IPSET)
+        {
+          ret_err(_("recompile with HAVE_IPSET defined to enable ipset directives"));
+          break;
+        }
+#endif
+#ifndef HAVE_NFTSET
+      if (option == LOPT_NFTSET)
+        {
+          ret_err(_("recompile with HAVE_NFTSET defined to enable nftset directives"));
+          break;
+        }
+#endif
+
       {
 	 struct ipsets ipsets_head;
 	 struct ipsets *ipsets = &ipsets_head;
+         struct ipsets **daemon_sets =
+           (option == LOPT_IPSET) ? &daemon->ipsets : &daemon->nftsets;
 	 int size;
 	 char *end;
 	 char **sets, **sets_pos;
@@ -2824,19 +2948,24 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	 sets = sets_pos = opt_malloc(sizeof(char *) * size);
 	 
 	 do {
+	   char *p;
 	   end = split(arg);
-	   *sets_pos++ = opt_string_alloc(arg);
+	   *sets_pos = opt_string_alloc(arg);
+	   /* Use '#' to delimit table and set */
+	   if (option == LOPT_NFTSET)
+	     while ((p = strchr(*sets_pos, '#')))
+	       *p = ' ';
+	   sets_pos++;
 	   arg = end;
 	 } while (end);
 	 *sets_pos = 0;
 	 for (ipsets = &ipsets_head; ipsets->next; ipsets = ipsets->next)
 	   ipsets->next->sets = sets;
-	 ipsets->next = daemon->ipsets;
-	 daemon->ipsets = ipsets_head.next;
+	 ipsets->next = *daemon_sets;
+	 *daemon_sets = ipsets_head.next;
 	 
 	 break;
       }
-#endif
       
     case LOPT_CMARK_ALST_EN: /* --connmark-allowlist-enable */
 #ifndef HAVE_CONNTRACK
@@ -3616,6 +3745,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 		      inet_ntop(AF_INET, &in, daemon->addrbuff, ADDRSTRLEN);
 		      sprintf(errstr, _("duplicate dhcp-host IP address %s"),
 			      daemon->addrbuff);
+		      dhcp_config_free(new);
 		      return 0;
 		    }	      
 	      }
@@ -3779,16 +3909,16 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 
     case LOPT_NAME_MATCH: /* --dhcp-name-match */
       {
-	struct dhcp_match_name *new = opt_malloc(sizeof(struct dhcp_match_name));
-	struct dhcp_netid *id = opt_malloc(sizeof(struct dhcp_netid));
+	struct dhcp_match_name *new;
 	ssize_t len;
 	
 	if (!(comma = split(arg)) || (len = strlen(comma)) == 0)
 	  ret_err(gen_err);
 
+	new = opt_malloc(sizeof(struct dhcp_match_name));
 	new->wildcard = 0;
-	new->netid = id;
-	id->net = opt_string_alloc(set_prefix(arg));
+	new->netid = opt_malloc(sizeof(struct dhcp_netid));
+	new->netid->net = opt_string_alloc(set_prefix(arg));
 
 	if (comma[len-1] == '*')
 	  {
@@ -3992,6 +4122,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	       }
 	   }
 	 
+	 dhcp_netid_free(new->netid);
+	 free(new);
 	 ret_err(gen_err);
        }
 	 
@@ -4026,7 +4158,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
     case LOPT_SUBSCR:   /* --dhcp-subscrid */
       {
 	 unsigned char *p;
-	 int dig = 0;
+	 int dig, colon;
 	 struct dhcp_vendor *new = opt_malloc(sizeof(struct dhcp_vendor));
 	 
 	 if (!(comma = split(arg)))
@@ -4050,13 +4182,16 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	 else
 	   comma = arg;
 	 
-	 for (p = (unsigned char *)comma; *p; p++)
+	 for (dig = 0, colon = 0, p = (unsigned char *)comma; *p; p++)
 	   if (isxdigit(*p))
 	     dig = 1;
-	   else if (*p != ':')
+	   else if (*p == ':')
+	     colon = 1;
+	   else
 	     break;
+	 
 	 unhide_metas(comma);
-	 if (option == 'U' || option == 'j' || *p || !dig)
+	 if (option == 'U' || option == 'j' || *p || !dig || !colon)
 	   {
 	     new->len = strlen(comma);  
 	     new->data = opt_malloc(new->len);
@@ -4179,26 +4314,56 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	}
       }
       break;
-
+      
     case LOPT_RELAY: /* --dhcp-relay */
       {
 	struct dhcp_relay *new = opt_malloc(sizeof(struct dhcp_relay));
-	comma = split(arg);
-	new->interface = opt_string_alloc(split(comma));
+	char *two = split(arg);
+	char *three = split(two);
+	
 	new->iface_index = 0;
-	if (comma && inet_pton(AF_INET, arg, &new->local) && inet_pton(AF_INET, comma, &new->server))
+
+	if (two)
 	  {
-	    new->next = daemon->relay4;
-	    daemon->relay4 = new;
-	  }
+	    if (inet_pton(AF_INET, arg, &new->local))
+	      {
+		if (!inet_pton(AF_INET, two, &new->server))
+		  {
+		    new->server.addr4.s_addr = 0;
+		    		    
+		    /* Fail for three arg version where there are not two addresses. 
+		       Also fail when broadcasting to wildcard address. */
+		    if (three || strchr(two, '*'))
+		      two = NULL;
+		    else
+		      three = two;
+		  }
+		
+		new->next = daemon->relay4;
+		daemon->relay4 = new;
+	      }
 #ifdef HAVE_DHCP6
-	else if (comma && inet_pton(AF_INET6, arg, &new->local) && inet_pton(AF_INET6, comma, &new->server))
-	  {
-	    new->next = daemon->relay6;
-	    daemon->relay6 = new;
-	  }
+	    else if (inet_pton(AF_INET6, arg, &new->local))
+	      {
+		if (!inet_pton(AF_INET6, two, &new->server))
+		  {
+		    inet_pton(AF_INET6, ALL_SERVERS, &new->server.addr6);
+		    /* Fail for three arg version where there are not two addresses.
+		       Also fail when multicasting to wildcard address. */
+		    if (three || strchr(two, '*'))
+		      two = NULL;
+		    else
+		      three = two;
+		  }
+		new->next = daemon->relay6;
+		daemon->relay6 = new;
+	      }
 #endif
-	else
+
+	    new->interface = opt_string_alloc(three);
+	  }
+	
+	if (!two)
 	  {
 	    free(new->interface);
 	    ret_err_free(_("Bad dhcp-relay"), new);
@@ -4367,7 +4532,7 @@ err:
     case LOPT_CNAME: /* --cname */
       {
 	struct cname *new;
-	char *alias, *target, *last, *pen;
+	char *alias, *target=NULL, *last, *pen;
 	int ttl = -1;
 
 	for (last = pen = NULL, comma = arg; comma; comma = split(comma))
@@ -4382,13 +4547,13 @@ err:
 	if (pen != arg && atoi_check(last, &ttl))
 	  last = pen;
 	  	
-    	target = canonicalise_opt(last);
-
 	while (arg != last)
 	  {
 	    int arglen = strlen(arg);
 	    alias = canonicalise_opt(arg);
 
+	    if (!target)
+	      target = canonicalise_opt(last);
 	    if (!alias || !target)
 	      {
 		free(target);
@@ -4691,7 +4856,7 @@ err:
 		struct name_list *nl;
 		if (!canon)
                   {
-		    struct name_list *tmp = new->names, *next;
+		    struct name_list *tmp, *next;
 		    for (tmp = new->names; tmp; tmp = next)
 		      {
 			next = tmp->next;
@@ -4816,11 +4981,19 @@ static void read_file(char *file, FILE *f, int hard_opt)
   
   while (fgets(buff, MAXDNAME, f))
     {
-      int white, i;
-      volatile int option = (hard_opt == LOPT_REV_SERV) ? 0 : hard_opt;
+      int white, i, script = 0;
+      volatile int option;
       char *errmess, *p, *arg, *start;
       size_t len;
 
+      if (hard_opt == LOPT_CONF_SCRIPT)
+	{
+	  hard_opt = 0;
+	  script = 1;
+	}
+      
+      option = (hard_opt == LOPT_REV_SERV) ? 0 : hard_opt;
+ 
       /* Memory allocation failure longjmps here if mem_recover == 1 */ 
       if (option != 0 || hard_opt == LOPT_REV_SERV)
 	{
@@ -4934,7 +5107,11 @@ static void read_file(char *file, FILE *f, int hard_opt)
 	  
       if (errmess || !one_opt(option, arg, daemon->namebuff, _("error"), 0, hard_opt == LOPT_REV_SERV))
 	{
-	  sprintf(daemon->namebuff + strlen(daemon->namebuff), _(" at line %d of %s"), lineno, file);
+	  if (script)
+	    sprintf(daemon->namebuff + strlen(daemon->namebuff), _(" in output from %s"), file);
+	  else
+	    sprintf(daemon->namebuff + strlen(daemon->namebuff), _(" at line %d of %s"), lineno, file);
+	  
 	  if (hard_opt != 0)
 	    my_syslog(LOG_ERR, "%s", daemon->namebuff);
 	  else
@@ -4943,7 +5120,6 @@ static void read_file(char *file, FILE *f, int hard_opt)
     }
 
   mem_recover = 0;
-  fclose(f);
 }
 
 #if defined(HAVE_DHCP) && defined(HAVE_INOTIFY)
@@ -4963,7 +5139,7 @@ int option_read_dynfile(char *file, int flags)
 static int one_file(char *file, int hard_opt)
 {
   FILE *f;
-  int nofile_ok = 0;
+  int nofile_ok = 0, do_popen = 0;
   static int read_stdin = 0;
   static struct fileread {
     dev_t dev;
@@ -4971,13 +5147,13 @@ static int one_file(char *file, int hard_opt)
     struct fileread *next;
   } *filesread = NULL;
   
-  if (hard_opt == '7')
+  if (hard_opt == LOPT_CONF_OPT)
     {
       /* default conf-file reading */
       hard_opt = 0;
       nofile_ok = 1;
     }
-
+  
   if (hard_opt == 0 && strcmp(file, "-") == 0)
     {
       if (read_stdin == 1)
@@ -4991,6 +5167,12 @@ static int one_file(char *file, int hard_opt)
       /* ignore repeated files. */
       struct stat statbuf;
     
+      if (hard_opt == LOPT_CONF_SCRIPT)
+	{
+	  hard_opt = 0;
+	  do_popen = 1;
+	}
+      
       if (hard_opt == 0 && stat(file, &statbuf) == 0)
 	{
 	  struct fileread *r;
@@ -5005,8 +5187,13 @@ static int one_file(char *file, int hard_opt)
 	  r->dev = statbuf.st_dev;
 	  r->ino = statbuf.st_ino;
 	}
-      
-      if (!(f = fopen(file, "r")))
+
+      if (do_popen)
+	{
+	  if (!(f = popen(file, "r")))
+	    die(_("cannot execute %s: %s"), file, EC_FILE);
+	}
+      else if (!(f = fopen(file, "r")))
 	{   
 	  if (errno == ENOENT && nofile_ok)
 	    return 1; /* No conffile, all done. */
@@ -5024,7 +5211,21 @@ static int one_file(char *file, int hard_opt)
 	} 
     }
   
-  read_file(file, f, hard_opt);
+  read_file(file, f, do_popen ? LOPT_CONF_SCRIPT : hard_opt);
+
+  if (do_popen)
+    {
+      int rc;
+
+      if ((rc = pclose(f)) == -1)
+	die(_("error executing %s: %s"), file, EC_MISC);
+
+      if (rc != 0)
+	die(_("%s returns non-zero error code"), file, rc+10);
+    }
+  else
+    fclose(f);
+	
   return 1;
 }
 
@@ -5165,6 +5366,7 @@ void read_servers_file(void)
   
   mark_servers(SERV_FROM_FILE);
   read_file(daemon->servers_file, f, LOPT_REV_SERV);
+  fclose(f);
   cleanup_servers();
   check_servers(0);
 }
@@ -5390,7 +5592,7 @@ void read_opts(int argc, char **argv, char *compile_opts)
       free(conffile);
     }
   else
-    one_file(CONFFILE, '7');
+    one_file(CONFFILE, LOPT_CONF_OPT);
 
   /* port might not be known when the address is parsed - fill in here */
   if (daemon->servers)

src/outpacket.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/pattern.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -129,9 +129,9 @@ int is_valid_dns_name(const char *value)
   
   size_t num_bytes = 0;
   size_t num_labels = 0;
-  const char *label = NULL;
+  const char *c, *label = NULL;
   int is_label_numeric = 1;
-  for (const char *c = value;; c++)
+  for (c = value;; c++)
     {
       if (*c &&
 	  *c != '-' && *c != '.' &&
@@ -242,11 +242,11 @@ int is_valid_dns_name_pattern(const char *value)
   
   size_t num_bytes = 0;
   size_t num_labels = 0;
-  const char *label = NULL;
+  const char *c, *label = NULL;
   int is_label_numeric = 1;
   size_t num_wildcards = 0;
   int previous_label_has_wildcard = 1;
-  for (const char *c = value;; c++)
+  for (c = value;; c++)
     {
       if (*c &&
 	  *c != '*' && /* Wildcard. */

src/poll.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/radv-protocol.h

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/radv.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -123,7 +123,11 @@ void ra_start_unsolicited(time_t now, struct dhcp_context *context)
      and pick up new interfaces */
   
   if (context)
-    context->ra_short_period_start = context->ra_time = now;
+    {
+      context->ra_short_period_start = now;
+      /* start after 1 second to get logging right at startup. */
+      context->ra_time = now + 1;
+    }
   else
     for (context = daemon->dhcp6; context; context = context->next)
       if (!(context->flags & CONTEXT_TEMPLATE))
@@ -162,7 +166,7 @@ void icmp6_packet(time_t now)
     return;
    
   packet = (unsigned char *)daemon->outpacket.iov_base;
-  
+
   for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
     if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo)
       {
@@ -187,24 +191,36 @@ void icmp6_packet(time_t now)
  
   if (packet[1] != 0)
     return;
-  
+
   if (packet[0] == ICMP6_ECHO_REPLY)
     lease_ping_reply(&from.sin6_addr, packet, interface); 
   else if (packet[0] == ND_ROUTER_SOLICIT)
     {
       char *mac = "";
       struct dhcp_bridge *bridge, *alias;
+      ssize_t rem;
+      unsigned char *p;
+      int opt_sz;
+      
+#ifdef HAVE_DUMPFILE
+      dump_packet(DUMP_RA, (void *)packet, sz, (union mysockaddr *)&from, NULL, -1);
+#endif           
       
       /* look for link-layer address option for logging */
-      if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz)
+      for (rem = sz - 8, p = &packet[8]; rem >= 2; rem -= opt_sz, p += opt_sz)
 	{
-	  if ((packet[9] * 8 - 2) * 3 - 1 >= MAXDNAME) {
-	    return;
-	  }
-	  print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2);
-	  mac = daemon->namebuff;
+	  opt_sz = p[1] * 8;
+	  
+	  if (opt_sz == 0 || opt_sz > rem)
+	    return; /* Bad packet */
+	  
+	  if (p[0] == ICMP6_OPT_SOURCE_MAC && ((opt_sz - 2) * 3 - 1 < MAXDNAME))
+	    {
+	      print_mac(daemon->namebuff, &p[2], opt_sz - 2);
+	      mac = daemon->namebuff;
+	    }
 	}
-         
+      
       if (!option_bool(OPT_QUIET_RA))
 	my_syslog(MS_DHCP | LOG_INFO, "RTR-SOLICIT(%s) %s", interface, mac);
 
@@ -543,6 +559,10 @@ static void send_ra_alias(time_t now, int iface, char *iface_name, struct in6_ad
       setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &send_iface, sizeof(send_iface));
     }
   
+#ifdef HAVE_DUMPFILE
+  dump_packet(DUMP_RA, (void *)daemon->outpacket.iov_base, save_counter(-1), NULL, (union mysockaddr *)&addr, -1);
+#endif
+
   while (retry_send(sendto(daemon->icmp6fd, daemon->outpacket.iov_base, 
 			   save_counter(-1), 0, (struct sockaddr *)&addr, 
 			   sizeof(addr))));
@@ -746,6 +766,8 @@ static int add_lla(int index, unsigned int type, char *mac, size_t maclen, void
 	 add 7 to round up */
       int len = (maclen + 9) >> 3;
       unsigned char *p = expand(len << 3);
+      if (!p)
+	return 1;
       memset(p, 0, len << 3);
       *p++ = ICMP6_OPT_SOURCE_MAC;
       *p++ = len;

src/rfc1035.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -526,7 +526,7 @@ static int print_txt(struct dns_header *header, const size_t qlen, char *name,
 	}
 
       *p3 = 0;
-      log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, (char*)p1);
+      log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, (char*)p1, 0);
       /* restore */
       memmove(p1 + 1, p1, i);
       *p1 = len;
@@ -540,8 +540,8 @@ static int print_txt(struct dns_header *header, const size_t qlen, char *name,
    expired and cleaned out that way. 
    Return 1 if we reject an address because it look like part of dns-rebinding attack. */
 int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t now, 
-		      char **ipsets, int is_sign, int check_rebind, int no_cache_dnssec,
-		      int secure, int *doctored)
+		      struct ipsets *ipsets, struct ipsets *nftsets, int is_sign, int check_rebind,
+		      int no_cache_dnssec, int secure, int *doctored)
 {
   unsigned char *p, *p1, *endrr, *namep;
   int j, qtype, qclass, aqtype, aqclass, ardlen, res, searched_soa = 0;
@@ -551,6 +551,11 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
   char **ipsets_cur;
 #else
   (void)ipsets; /* unused */
+#endif
+#ifdef HAVE_NFTSET
+  char **nftsets_cur;
+#else
+  (void)nftsets; /* unused */
 #endif
   int found = 0, cname_count = CNAME_CHAIN;
   struct crec *cpp = NULL;
@@ -643,7 +648,7 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 #endif
 
 		  if (aqtype == T_CNAME)
-		    log_query(secflag | F_CNAME | F_FORWARD | F_UPSTREAM, name, NULL, NULL);
+		    log_query(secflag | F_CNAME | F_FORWARD | F_UPSTREAM, name, NULL, NULL, 0);
 		  
 		  if (!extract_name(header, qlen, &p1, name, 1, 0))
 		    return 0;
@@ -661,10 +666,10 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 		  found = 1; 
 		  
 		  if (!name_encoding)
-		    log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, querystr(NULL, aqtype));
+		    log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, NULL, aqtype);
 		  else
 		    {
-		      log_query(name_encoding | secflag | F_REVERSE | F_UPSTREAM, name, &addr, NULL);
+		      log_query(name_encoding | secflag | F_REVERSE | F_UPSTREAM, name, &addr, NULL, 0);
 		      if (insert)
 			cache_insert(name, &addr, C_IN, now, cttl, name_encoding | secflag | F_REVERSE);
 		    }
@@ -691,7 +696,7 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      cache_insert(NULL, &addr, C_IN, now, ttl, flags);
 	    }
 	  
-	  log_query(flags | F_UPSTREAM, name, &addr, NULL);
+	  log_query(flags | F_UPSTREAM, name, &addr, NULL, 0);
 	}
     }
   else
@@ -762,7 +767,7 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      if (!cname_count--)
 		return 0; /* looped CNAMES */
 	      
-	      log_query(secflag | F_CNAME | F_FORWARD | F_UPSTREAM, name, NULL, NULL);
+	      log_query(secflag | F_CNAME | F_FORWARD | F_UPSTREAM, name, NULL, NULL, 0);
 	      
 	      if (insert)
 		{
@@ -787,14 +792,17 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      if (!extract_name(header, qlen, &p1, name, 1, 0))
 		return 0;
 	      
-	      goto cname_loop1;
+	      if (qtype != T_CNAME)
+		goto cname_loop1;
+
+	      found = 1;
 	    }
 	  else if (aqtype != qtype)
 	    {
 #ifdef HAVE_DNSSEC
 	      if (!option_bool(OPT_DNSSEC_VALID) || aqtype != T_RRSIG)
 #endif
-		log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, querystr(NULL, aqtype));
+		log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, NULL, aqtype);
 	    }
 	  else if (!(flags & F_NXDOMAIN))
 	    {
@@ -840,14 +848,15 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 		  
 #ifdef HAVE_IPSET
 		  if (ipsets && (flags & (F_IPV4 | F_IPV6)))
-		    {
-		      ipsets_cur = ipsets;
-		      while (*ipsets_cur)
-			{
-			  log_query((flags & (F_IPV4 | F_IPV6)) | F_IPSET, name, &addr, *ipsets_cur);
-			  add_to_ipset(*ipsets_cur++, &addr, flags, 0);
-			}
-		    }
+		    for (ipsets_cur = ipsets->sets; *ipsets_cur; ipsets_cur++)
+		      if (add_to_ipset(*ipsets_cur, &addr, flags, 0) == 0)
+			log_query((flags & (F_IPV4 | F_IPV6)) | F_IPSET, ipsets->domain, &addr, *ipsets_cur, 1);
+#endif
+#ifdef HAVE_NFTSET
+		  if (nftsets && (flags & (F_IPV4 | F_IPV6)))
+		    for (nftsets_cur = nftsets->sets; *nftsets_cur; nftsets_cur++)
+		      if (add_to_nftset(*nftsets_cur, &addr, flags, 0) == 0)
+			log_query((flags & (F_IPV4 | F_IPV6)) | F_IPSET, nftsets->domain, &addr, *nftsets_cur, 0);
 #endif
 		}
 	      
@@ -869,7 +878,7 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 		    return 0;
 		}
 	      else
-		log_query(flags | F_FORWARD | secflag | F_UPSTREAM, name, &addr, querystr(NULL, aqtype));
+		log_query(flags | F_FORWARD | secflag | F_UPSTREAM, name, &addr, NULL, aqtype);
 	    }
 	  
 	  p1 = endrr;
@@ -877,8 +886,19 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	    return 0; /* bad packet */
 	}
       
-      if (!found && !option_bool(OPT_NO_NEG))
+      if (!found && (qtype != T_ANY || (flags & F_NXDOMAIN)))
 	{
+	  if (flags & F_NXDOMAIN)
+	    {
+	      flags &= ~(F_IPV4 | F_IPV6 | F_SRV);
+	      
+	      /* Can store NXDOMAIN reply to CNAME or ANY query. */
+	      if (qtype == T_CNAME || qtype == T_ANY)
+		insert = 1;
+	    }
+	  
+	  log_query(F_UPSTREAM | F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0), name, NULL, NULL, 0);
+	  
 	  if (!searched_soa)
 	    {
 	      searched_soa = 1;
@@ -887,22 +907,17 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	  
 	  /* If there's no SOA to get the TTL from, but there is a CNAME 
 	     pointing at this, inherit its TTL */
-	  if (ttl || cpp)
+	  if (insert && !option_bool(OPT_NO_NEG) && (ttl || cpp))
 	    {
 	      if (ttl == 0)
 		ttl = cttl;
 	      
-	      log_query(F_UPSTREAM | F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0), name, NULL, NULL);
-	      
-	      if (insert)
+	      newc = cache_insert(name, NULL, C_IN, now, ttl, F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0));	
+	      if (newc && cpp)
 		{
-		  newc = cache_insert(name, NULL, C_IN, now, ttl, F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0));	
-		  if (newc && cpp)
-		    {
-		      next_uid(newc);
-		      cpp->addr.cname.target.cache = newc;
-		      cpp->addr.cname.uid = newc->uid;
-		    }
+		  next_uid(newc);
+		  cpp->addr.cname.target.cache = newc;
+		  cpp->addr.cname.uid = newc->uid;
 		}
 	    }
 	}
@@ -1080,7 +1095,7 @@ void setup_reply(struct dns_header *header, unsigned int flags, int ede)
       union all_addr a;
       a.log.rcode = REFUSED;
       a.log.ede = ede;
-      log_query(F_CONFIG | F_RCODE, "error", &a, NULL);
+      log_query(F_CONFIG | F_RCODE, "error", &a, NULL, 0);
       SET_RCODE(header, REFUSED);
     }
 }
@@ -1440,36 +1455,55 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 
       ans = 0; /* have we answered this question */
 
-      while (--count != 0 && (crecp = cache_find_by_name(NULL, name, now, F_CNAME)))
-	{
-	  char *cname_target = cache_get_cname_target(crecp);
+      if (qclass == C_IN)
+	while (--count != 0 && (crecp = cache_find_by_name(NULL, name, now, F_CNAME | F_NXDOMAIN)))
+	  {
+	    char *cname_target;
 
-	  /* If the client asked for DNSSEC  don't use cached data. */
-	  if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) ||
-	      (rd_bit && (!do_bit || cache_validated(crecp))))
-	    {
-	      if (crecp->flags & F_CONFIG || qtype == T_CNAME)
-		ans = 1;
+	    if (crecp->flags & F_NXDOMAIN)
+	      {
+		if (qtype == T_CNAME)
+		  {
+		   if (!dryrun)
+		     log_query(crecp->flags, name, NULL, record_source(crecp->uid), 0);
+		    auth = 0;
+		    nxdomain = 1;
+		    ans = 1;
+		  }
+		break;
+	      }  
 
-	      if (!(crecp->flags & F_DNSSECOK))
-		sec_data = 0;
-
-	      if (!dryrun)
-		{
-		  log_query(crecp->flags, name, NULL, record_source(crecp->uid));
-		  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
-					  crec_ttl(crecp, now), &nameoffset,
-					  T_CNAME, C_IN, "d", cname_target))
-		    anscount++;
-		}
-
-	    }
-	  else
-	    return 0; /* give up if any cached CNAME in chain can't be used for DNSSEC reasons. */
-
-	  strcpy(name, cname_target);
-	}
-	  
+	    cname_target = cache_get_cname_target(crecp);
+	    
+	    /* If the client asked for DNSSEC  don't use cached data. */
+	    if ((crecp->flags & (F_HOSTS | F_DHCP | F_CONFIG)) ||
+		(rd_bit && (!do_bit || cache_validated(crecp))))
+	      {
+		if (crecp->flags & F_CONFIG || qtype == T_CNAME)
+		  ans = 1;
+		
+		if (!(crecp->flags & F_DNSSECOK))
+		  sec_data = 0;
+		
+		if (!dryrun)
+		  {
+		    log_query(crecp->flags, name, NULL, record_source(crecp->uid), 0);
+		    if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
+					    crec_ttl(crecp, now), &nameoffset,
+					    T_CNAME, C_IN, "d", cname_target))
+		      anscount++;
+		  }
+		
+	      }
+	    else
+	      return 0; /* give up if any cached CNAME in chain can't be used for DNSSEC reasons. */
+	    
+	    if (qtype == T_CNAME)
+	      break;
+	    
+	    strcpy(name, cname_target);
+	  }
+      
       if (qtype == T_TXT || qtype == T_ANY)
 	{
 	  struct txt_record *t;
@@ -1493,7 +1527,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 #endif
 		      if (ok)
 			{
-			  log_query(F_CONFIG | F_RRNAME, name, NULL, "<TXT>");
+			  log_query(F_CONFIG | F_RRNAME, name, NULL, "<TXT>", 0);
 			  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 						  ttl, NULL,
 						  T_TXT, t->class, "t", t->len, t->txt))
@@ -1515,7 +1549,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  if (!dryrun)
 		    {
 		       addr.log.rcode = NOTIMP;
-		       log_query(F_CONFIG | F_RCODE, name, &addr, NULL);
+		       log_query(F_CONFIG | F_RCODE, name, &addr, NULL, 0);
 		    }
 		  ans = 1, sec_data = 0;
 		}
@@ -1533,7 +1567,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		sec_data = 0;
 		if (!dryrun)
 		  {
-		    log_query(F_CONFIG | F_RRNAME, name, NULL, querystr(NULL, t->class));
+		    log_query(F_CONFIG | F_RRNAME, name, NULL, NULL, t->class);
 		    if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					    daemon->local_ttl, NULL,
 					    t->class, C_IN, "t", t->len, t->txt))
@@ -1589,7 +1623,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  ans = 1;
 		  if (!dryrun)
 		    {
-		      log_query(is_arpa | F_REVERSE | F_CONFIG, intr->name, &addr, NULL);
+		      log_query(is_arpa | F_REVERSE | F_CONFIG, intr->name, &addr, NULL, 0);
 		      if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					      daemon->local_ttl, NULL,
 					      T_PTR, C_IN, "d", intr->name))
@@ -1602,7 +1636,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  sec_data = 0;
 		  if (!dryrun)
 		    {
-		      log_query(F_CONFIG | F_RRNAME, name, NULL, "<PTR>");
+		      log_query(F_CONFIG | F_RRNAME, name, NULL, "<PTR>", 0);
 		      for (ptr = daemon->ptr; ptr; ptr = ptr->next)
 			if (hostname_isequal(name, ptr->name) &&
 			    add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
@@ -1612,7 +1646,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			 
 		    }
 		}
-	      else if ((crecp = cache_find_by_addr(NULL, &addr, now, is_arpa)))
+	      else if (is_arpa && (crecp = cache_find_by_addr(NULL, &addr, now, is_arpa)))
 		{
 		  /* Don't use cache when DNSSEC data required, unless we know that
 		     the zone is unsigned, which implies that we're doing
@@ -1637,7 +1671,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			      if (crecp->flags & F_NXDOMAIN)
 				nxdomain = 1;
 			      if (!dryrun)
-				log_query(crecp->flags & ~F_FORWARD, name, &addr, NULL);
+				log_query(crecp->flags & ~F_FORWARD, name, &addr, NULL, 0);
 			    }
 			  else
 			    {
@@ -1646,7 +1680,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			      if (!dryrun)
 				{
 				  log_query(crecp->flags & ~F_FORWARD, cache_get_name(crecp), &addr, 
-					    record_source(crecp->uid));
+					    record_source(crecp->uid), 0);
 				  
 				  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 							  crec_ttl(crecp, now), NULL,
@@ -1663,7 +1697,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  sec_data = 0;
 		  if (!dryrun)
 		    {
-		      log_query(F_CONFIG | F_REVERSE | is_arpa, name, &addr, NULL); 
+		      log_query(F_CONFIG | F_REVERSE | is_arpa, name, &addr, NULL, 0);
 		      
 		      if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					      daemon->local_ttl, NULL,
@@ -1681,7 +1715,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  nxdomain = 1;
 		  if (!dryrun)
 		    log_query(F_CONFIG | F_REVERSE | is_arpa | F_NEG | F_NXDOMAIN,
-			      name, &addr, NULL);
+			      name, &addr, NULL, 0);
 		}
 	    }
 
@@ -1736,7 +1770,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			      if (!dryrun)
 				{
 				  gotit = 1;
-				  log_query(F_FORWARD | F_CONFIG | flag, name, &addrlist->addr, NULL);
+				  log_query(F_FORWARD | F_CONFIG | flag, name, &addrlist->addr, NULL, 0);
 				  if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 							  daemon->local_ttl, NULL, type, C_IN, 
 							  type == T_A ? "4" : "6", &addrlist->addr))
@@ -1746,12 +1780,12 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		      }
 		  
 		  if (!dryrun && !gotit)
-		    log_query(F_FORWARD | F_CONFIG | flag | F_NEG, name, NULL, NULL);
+		    log_query(F_FORWARD | F_CONFIG | flag | F_NEG, name, NULL, NULL, 0);
 		     
 		  continue;
 		}
 
-	      if ((crecp = cache_find_by_name(NULL, name, now, flag | (dryrun ? F_NO_RR : 0))))
+	      if ((crecp = cache_find_by_name(NULL, name, now, flag | F_NXDOMAIN | (dryrun ? F_NO_RR : 0))))
 		{
 		  int localise = 0;
 		  
@@ -1791,7 +1825,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			    if (crecp->flags & F_NXDOMAIN)
 			      nxdomain = 1;
 			    if (!dryrun)
-			      log_query(crecp->flags, name, NULL, NULL);
+			      log_query(crecp->flags, name, NULL, NULL, 0);
 			  }
 			else 
 			  {
@@ -1809,7 +1843,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			    if (!dryrun)
 			      {
 				log_query(crecp->flags & ~F_REVERSE, name, &crecp->addr,
-					  record_source(crecp->uid));
+					  record_source(crecp->uid), 0);
 				
 				if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 							crec_ttl(crecp, now), NULL, type, C_IN, 
@@ -1824,7 +1858,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  ans = 1, sec_data = 0;
 		  if (!dryrun)
 		    {
-		      log_query(F_FORWARD | F_CONFIG | flag, name, &addr, NULL);
+		      log_query(F_FORWARD | F_CONFIG | flag, name, &addr, NULL, 0);
 		      if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 					      daemon->local_ttl, NULL, type, C_IN, type == T_A ? "4" : "6", &addr))
 			anscount++;
@@ -1843,7 +1877,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		    if (!dryrun)
 		      {
 			int offset;
-			log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>");
+			log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>", 0);
 			if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->local_ttl,
 						&offset, T_MX, C_IN, "sd", rec->weight, rec->target))
 			  {
@@ -1861,7 +1895,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		  sec_data = 0;
 		  if (!dryrun)
 		    {
-		      log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>");
+		      log_query(F_CONFIG | F_RRNAME, name, NULL, "<MX>", 0);
 		      if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->local_ttl, NULL, 
 					      T_MX, C_IN, "sd", 1, 
 					      option_bool(OPT_SELFMX) ? name : daemon->mxtarget))
@@ -1883,7 +1917,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		    if (!dryrun)
 		      {
 			int offset;
-			log_query(F_CONFIG | F_RRNAME, name, NULL, "<SRV>");
+			log_query(F_CONFIG | F_RRNAME, name, NULL, "<SRV>", 0);
 			if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->local_ttl, 
 						&offset, T_SRV, C_IN, "sssd", 
 						rec->priority, rec->weight, rec->srvport, rec->target))
@@ -1915,27 +1949,31 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 
 	      if (!found)
 		{
-		  if ((crecp = cache_find_by_name(NULL, name, now, F_SRV | (dryrun ? F_NO_RR : 0))) &&
+		  if ((crecp = cache_find_by_name(NULL, name, now, F_SRV | F_NXDOMAIN | (dryrun ? F_NO_RR : 0))) &&
 		      rd_bit && (!do_bit || (option_bool(OPT_DNSSEC_VALID) && !(crecp->flags & F_DNSSECOK))))
-		    {
-		      if (!(crecp->flags & F_DNSSECOK))
-			sec_data = 0;
-		      
-		      auth = 0;
-		      found = ans = 1;
-		      
-		      do {
+		    do
+		      {
+			/* don't answer wildcard queries with data not from /etc/hosts or dhcp leases, except for NXDOMAIN */
+			if (qtype == T_ANY && !(crecp->flags & (F_NXDOMAIN)))
+			  break;
+			
+			if (!(crecp->flags & F_DNSSECOK))
+			  sec_data = 0;
+			
+			auth = 0;
+			found = ans = 1;
+			
 			if (crecp->flags & F_NEG)
 			  {
 			    if (crecp->flags & F_NXDOMAIN)
 			      nxdomain = 1;
 			    if (!dryrun)
-			      log_query(crecp->flags, name, NULL, NULL);
+			      log_query(crecp->flags, name, NULL, NULL, 0);
 			  }
 			else if (!dryrun)
 			  {
 			    char *target = blockdata_retrieve(crecp->addr.srv.target, crecp->addr.srv.targetlen, NULL);
-			    log_query(crecp->flags, name, NULL, 0);
+			    log_query(crecp->flags, name, NULL, NULL, 0);
 			    
 			    if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, 
 						    crec_ttl(crecp, now), NULL, T_SRV, C_IN, "sssd",
@@ -1945,14 +1983,13 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 			  }
 		      } while ((crecp = cache_find_by_name(crecp, name, now, F_SRV)));
 		    }
-		}
-
+	      
 	      if (!found && option_bool(OPT_FILTER) && (qtype == T_SRV || (qtype == T_ANY && strchr(name, '_'))))
 		{
 		  ans = 1;
 		  sec_data = 0;
 		  if (!dryrun)
-		    log_query(F_CONFIG | F_NEG, name, NULL, NULL);
+		    log_query(F_CONFIG | F_NEG, name, NULL, NULL, 0);
 		}
 	    }
 
@@ -1966,7 +2003,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 		    sec_data = 0;
 		    if (!dryrun)
 		      {
-			log_query(F_CONFIG | F_RRNAME, name, NULL, "<NAPTR>");
+			log_query(F_CONFIG | F_RRNAME, name, NULL, "<NAPTR>", 0);
 			if (add_resource_record(header, limit, &trunc, nameoffset, &ansp, daemon->local_ttl, 
 						NULL, T_NAPTR, C_IN, "sszzzd", 
 						na->order, na->pref, na->flags, na->services, na->regexp, na->replace))
@@ -1983,7 +2020,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
 	      ans = 1;
 	      sec_data = 0;
 	      if (!dryrun)
-		log_query(F_CONFIG | F_NEG, name, &addr, NULL);
+		log_query(F_CONFIG | F_NEG, name, &addr, NULL, 0);
 	    }
 	}
 

src/rfc2131.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -2200,8 +2200,9 @@ static int pxe_uefi_workaround(int pxe_arch, struct dhcp_netid *netid, struct dh
       inet_ntop(AF_INET, &mess->siaddr, (char *)mess->sname, INET_ADDRSTRLEN);
     }
   
-  snprintf((char *)mess->file, sizeof(mess->file), 
-	   strchr(found->basename, '.') ? "%s" : "%s.0", found->basename);
+  if (found->basename)
+    snprintf((char *)mess->file, sizeof(mess->file), 
+	     strchr(found->basename, '.') ? "%s" : "%s.0", found->basename);
   
   return 1;
 }

src/rfc3315.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -2100,95 +2100,116 @@ static unsigned int opt6_uint(unsigned char *opt, int offset, int size)
   return ret;
 } 
 
-void relay_upstream6(struct dhcp_relay *relay, ssize_t sz, 
-		     struct in6_addr *peer_address, u32 scope_id, time_t now)
+int relay_upstream6(int iface_index, ssize_t sz, 
+		    struct in6_addr *peer_address, u32 scope_id, time_t now)
 {
-  /* ->local is same value for all relays on ->current chain */
-  
-  union all_addr from;
   unsigned char *header;
   unsigned char *inbuff = daemon->dhcp_packet.iov_base;
   int msg_type = *inbuff;
-  int hopcount;
+  int hopcount, o;
   struct in6_addr multicast;
   unsigned int maclen, mactype;
   unsigned char mac[DHCP_CHADDR_MAX];
+  struct dhcp_relay *relay;
+  
+  for (relay = daemon->relay6; relay; relay = relay->next)
+    if (relay->iface_index != 0 && relay->iface_index == iface_index)
+      break;
 
+  /* No relay config. */
+  if (!relay)
+    return 0;
+  
   inet_pton(AF_INET6, ALL_SERVERS, &multicast);
   get_client_mac(peer_address, scope_id, mac, &maclen, &mactype, now);
-
-  /* source address == relay address */
-  from.addr6 = relay->local.addr6;
-    
+  
   /* Get hop count from nested relayed message */ 
   if (msg_type == DHCP6RELAYFORW)
     hopcount = *((unsigned char *)inbuff+1) + 1;
   else
     hopcount = 0;
 
-  /* RFC 3315 HOP_COUNT_LIMIT */
-  if (hopcount > 32)
-    return;
-
   reset_counter();
 
-  if ((header = put_opt6(NULL, 34)))
+  /* RFC 3315 HOP_COUNT_LIMIT */
+  if (hopcount > 32 || !(header = put_opt6(NULL, 34)))
+    return 1;
+  
+  header[0] = DHCP6RELAYFORW;
+  header[1] = hopcount;
+  memcpy(&header[18], peer_address, IN6ADDRSZ);
+  
+  /* RFC-6939 */
+  if (maclen != 0)
     {
-      int o;
-
-      header[0] = DHCP6RELAYFORW;
-      header[1] = hopcount;
-      memcpy(&header[2],  &relay->local.addr6, IN6ADDRSZ);
-      memcpy(&header[18], peer_address, IN6ADDRSZ);
- 
-      /* RFC-6939 */
-      if (maclen != 0)
-	{
-	  o = new_opt6(OPTION6_CLIENT_MAC);
-	  put_opt6_short(mactype);
-	  put_opt6(mac, maclen);
-	  end_opt6(o);
-	}
-      
-      o = new_opt6(OPTION6_RELAY_MSG);
-      put_opt6(inbuff, sz);
+      o = new_opt6(OPTION6_CLIENT_MAC);
+      put_opt6_short(mactype);
+      put_opt6(mac, maclen);
       end_opt6(o);
-      
-      for (; relay; relay = relay->current)
-	{
-	  union mysockaddr to;
-	  
-	  to.sa.sa_family = AF_INET6;
-	  to.in6.sin6_addr = relay->server.addr6;
-	  to.in6.sin6_port = htons(DHCPV6_SERVER_PORT);
-	  to.in6.sin6_flowinfo = 0;
-	  to.in6.sin6_scope_id = 0;
-
-	  if (IN6_ARE_ADDR_EQUAL(&relay->server.addr6, &multicast))
-	    {
-	      int multicast_iface;
-	      if (!relay->interface || strchr(relay->interface, '*') ||
-		  (multicast_iface = if_nametoindex(relay->interface)) == 0 ||
-		  setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &multicast_iface, sizeof(multicast_iface)) == -1)
-		my_syslog(MS_DHCP | LOG_ERR, _("Cannot multicast to DHCPv6 server without correct interface"));
-	    }
-		
-	  send_from(daemon->dhcp6fd, 0, daemon->outpacket.iov_base, save_counter(-1), &to, &from, 0);
-	  
-	  if (option_bool(OPT_LOG_OPTS))
-	    {
-	      inet_ntop(AF_INET6, &relay->local, daemon->addrbuff, ADDRSTRLEN);
-	      inet_ntop(AF_INET6, &relay->server, daemon->namebuff, ADDRSTRLEN);
-	      my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay %s -> %s"), daemon->addrbuff, daemon->namebuff);
-	    }
-
-	  /* Save this for replies */
-	  relay->iface_index = scope_id;
-	}
     }
+  
+  o = new_opt6(OPTION6_RELAY_MSG);
+  put_opt6(inbuff, sz);
+  end_opt6(o);
+  
+  for (; relay; relay = relay->next)
+    if (relay->iface_index != 0 && relay->iface_index == iface_index)
+      {
+	union mysockaddr to;
+	union all_addr from;
+	
+	/* source address == relay address */
+	from.addr6 = relay->local.addr6;
+	memcpy(&header[2], &relay->local.addr6, IN6ADDRSZ);
+	
+	to.sa.sa_family = AF_INET6;
+	to.in6.sin6_addr = relay->server.addr6;
+	to.in6.sin6_port = htons(DHCPV6_SERVER_PORT);
+	to.in6.sin6_flowinfo = 0;
+	to.in6.sin6_scope_id = 0;
+	
+	if (IN6_ARE_ADDR_EQUAL(&relay->server.addr6, &multicast))
+	  {
+	    int multicast_iface;
+	    if (!relay->interface || strchr(relay->interface, '*') ||
+		(multicast_iface = if_nametoindex(relay->interface)) == 0 ||
+		setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &multicast_iface, sizeof(multicast_iface)) == -1)
+	      {
+		my_syslog(MS_DHCP | LOG_ERR, _("Cannot multicast DHCP relay via interface %s"), relay->interface);
+		continue;
+	      }
+	  }
+	
+#ifdef HAVE_DUMPFILE
+	{
+	  union mysockaddr fromsock;
+	  fromsock.in6.sin6_port = htons(DHCPV6_SERVER_PORT);
+	  fromsock.in6.sin6_addr = from.addr6;
+	  fromsock.sa.sa_family = AF_INET6;
+	  fromsock.in6.sin6_flowinfo = 0;
+	  fromsock.in6.sin6_scope_id = 0;
+	  
+	  dump_packet(DUMP_DHCPV6, (void *)daemon->outpacket.iov_base, save_counter(-1), &fromsock, &to, 0);
+	}
+#endif
+	send_from(daemon->dhcp6fd, 0, daemon->outpacket.iov_base, save_counter(-1), &to, &from, 0);
+	
+	if (option_bool(OPT_LOG_OPTS))
+	  {
+	    inet_ntop(AF_INET6, &relay->local, daemon->addrbuff, ADDRSTRLEN);
+	    if (IN6_ARE_ADDR_EQUAL(&relay->server.addr6, &multicast))
+	      snprintf(daemon->namebuff, MAXDNAME, _("multicast via %s"), relay->interface);
+	    else
+	      inet_ntop(AF_INET6, &relay->server, daemon->namebuff, ADDRSTRLEN);
+	    my_syslog(MS_DHCP | LOG_INFO, _("DHCP relay at %s -> %s"), daemon->addrbuff, daemon->namebuff);
+	  }
+	
+      }
+  
+  return 1;
 }
 
-unsigned short relay_reply6(struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface)
+int relay_reply6(struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface)
 {
   struct dhcp_relay *relay;
   struct in6_addr link;
@@ -2220,11 +2241,76 @@ unsigned short relay_reply6(struct sockaddr_in6 *peer, ssize_t sz, char *arrival
 	    put_opt6(opt6_ptr(opt, 0), opt6_len(opt));
 	    memcpy(&peer->sin6_addr, &inbuff[18], IN6ADDRSZ); 
 	    peer->sin6_scope_id = relay->iface_index;
-	    return encap_type == DHCP6RELAYREPL ? DHCPV6_SERVER_PORT : DHCPV6_CLIENT_PORT;
-	  }
-    }
 
+	    if (encap_type == DHCP6RELAYREPL)
+	      {
+		peer->sin6_port = ntohs(DHCPV6_SERVER_PORT);
+		return 1;
+	      }
+
+	    peer->sin6_port = ntohs(DHCPV6_CLIENT_PORT);
+	    
+#ifdef HAVE_SCRIPT
+	    if (daemon->lease_change_command && encap_type == DHCP6REPLY)
+	      {
+		/* decapsulate relayed message */
+		opts = opt6_ptr(opt, 4);
+		end = opt6_ptr(opt, opt6_len(opt));
+
+		for (opt = opts; opt; opt = opt6_next(opt, end))
+		  if (opt6_type(opt) == OPTION6_IA_PD && opt6_len(opt) > 12) 
+		    {
+		      void *ia_opts = opt6_ptr(opt, 12);
+		      void *ia_end = opt6_ptr(opt, opt6_len(opt));
+		      void *ia_opt;
+		      
+		      for (ia_opt = ia_opts; ia_opt; ia_opt = opt6_next(ia_opt, ia_end))
+			/* valid lifetime must not be zero. */
+			if (opt6_type(ia_opt) == OPTION6_IAPREFIX && opt6_len(ia_opt) >= 25 && opt6_uint(ia_opt, 4, 4) != 0)
+			  {
+			    if (daemon->free_snoops ||
+				(daemon->free_snoops = whine_malloc(sizeof(struct snoop_record))))
+			      {
+				struct snoop_record *snoop = daemon->free_snoops;
+				
+				daemon->free_snoops = snoop->next;
+				snoop->client = peer->sin6_addr;
+				snoop->prefix_len = opt6_uint(ia_opt, 8, 1); 
+				memcpy(&snoop->prefix, opt6_ptr(ia_opt, 9), IN6ADDRSZ); 
+				snoop->next = relay->snoop_records;
+				relay->snoop_records = snoop;
+			      }
+			  }
+		    }
+	      }
+#endif		
+	    return 1;
+	  }
+      
+    }
+  
   return 0;
 }
 
+#ifdef HAVE_SCRIPT
+int do_snoop_script_run(void)
+{
+  struct dhcp_relay *relay;
+  struct snoop_record *snoop;
+  
+  for (relay = daemon->relay6; relay; relay = relay->next)
+    if ((snoop = relay->snoop_records))
+      {
+	relay->snoop_records = snoop->next;
+	snoop->next = daemon->free_snoops;
+	daemon->free_snoops = snoop;
+	
+	queue_relay_snoop(&snoop->client, relay->iface_index, &snoop->prefix, snoop->prefix_len);
+	return 1;
+      }
+  
+  return 0;
+}
+#endif
+
 #endif

src/rrfilter.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -156,7 +156,7 @@ static int check_rrs(unsigned char *p, struct dns_header *header, size_t plen, i
 }
 	
 
-/* mode is 0 to remove EDNS0, 1 to filter DNSSEC RRs */
+/* mode may be remove EDNS0 or DNSSEC RRs or remove A or AAAA from answer section. */
 size_t rrfilter(struct dns_header *header, size_t plen, int mode)
 {
   static unsigned char **rrs;
@@ -192,20 +192,37 @@ size_t rrfilter(struct dns_header *header, size_t plen, int mode)
       if (!ADD_RDLEN(header, p, plen, rdlen))
 	return plen;
 
-      /* Don't remove the answer. */
-      if (i < ntohs(header->ancount) && type == qtype && class == qclass)
-	continue;
-      
-      if (mode == 0) /* EDNS */
+      if (mode == RRFILTER_EDNS0) /* EDNS */
 	{
 	  /* EDNS mode, remove T_OPT from additional section only */
 	  if (i < (ntohs(header->nscount) + ntohs(header->ancount)) || type != T_OPT)
 	    continue;
 	}
-      else if (type != T_NSEC && type != T_NSEC3 && type != T_RRSIG)
-	/* DNSSEC mode, remove SIGs and NSECs from all three sections. */
-	continue;
-      
+      else if (mode == RRFILTER_DNSSEC)
+	{
+	  if (type != T_NSEC && type != T_NSEC3 && type != T_RRSIG)
+	    /* DNSSEC mode, remove SIGs and NSECs from all three sections. */
+	    continue;
+
+	  /* Don't remove the answer. */
+	  if (i < ntohs(header->ancount) && type == qtype && class == qclass)
+	    continue;
+	}
+      else
+	{
+	  /* Only looking at answer section now. */
+	  if (i >= ntohs(header->ancount))
+	    break;
+
+	  if (class != C_IN)
+	    continue;
+	  
+	  if (mode == RRFILTER_A && type != T_A)
+	    continue;
+
+	  if (mode == RRFILTER_AAAA && type != T_AAAA)
+	    continue;
+	}
       
       if (!expand_workspace(&rrs, &rr_sz, rr_found + 1))
 	return plen; 

src/slaac.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/tftp.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -19,9 +19,9 @@
 #ifdef HAVE_TFTP
 
 static void handle_tftp(time_t now, struct tftp_transfer *transfer, ssize_t len);
-static struct tftp_file *check_tftp_fileperm(ssize_t *len, char *prefix);
+static struct tftp_file *check_tftp_fileperm(ssize_t *len, char *prefix, char *client);
 static void free_transfer(struct tftp_transfer *transfer);
-static ssize_t tftp_err(int err, char *packet, char *message, char *file);
+static ssize_t tftp_err(int err, char *packet, char *message, char *file, char *arg2);
 static ssize_t tftp_err_oops(char *packet, const char *file);
 static ssize_t get_block(char *packet, struct tftp_transfer *transfer);
 static char *next(char **p, char *end);
@@ -95,6 +95,10 @@ void tftp_request(struct listener *listen, time_t now)
 
   if ((len = recvmsg(listen->tftpfd, &msg, 0)) < 2)
     return;
+
+#ifdef HAVE_DUMPFILE
+  dump_packet(DUMP_TFTP, (void *)packet, len, (union mysockaddr *)&peer, NULL, TFTP_PORT);
+#endif
   
   /* Can always get recvd interface for IPv6 */
   if (!check_dest)
@@ -362,7 +366,7 @@ void tftp_request(struct listener *listen, time_t now)
       !(mode = next(&p, end)) ||
       (strcasecmp(mode, "octet") != 0 && strcasecmp(mode, "netascii") != 0))
     {
-      len = tftp_err(ERR_ILL, packet, _("unsupported request from %s"), daemon->addrbuff);
+      len = tftp_err(ERR_ILL, packet, _("unsupported request from %s"), daemon->addrbuff, NULL);
       is_err = 1;
     }
   else
@@ -472,7 +476,7 @@ void tftp_request(struct listener *listen, time_t now)
       strncat(daemon->namebuff, filename, (MAXDNAME-1) - strlen(daemon->namebuff));
       
       /* check permissions and open file */
-      if ((transfer->file = check_tftp_fileperm(&len, prefix)))
+      if ((transfer->file = check_tftp_fileperm(&len, prefix, daemon->addrbuff)))
 	{
 	  if ((len = get_block(packet, transfer)) == -1)
 	    len = tftp_err_oops(packet, daemon->namebuff);
@@ -482,6 +486,10 @@ void tftp_request(struct listener *listen, time_t now)
     }
 
   send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), packet, len, &peer, &addra, if_index);
+
+#ifdef HAVE_DUMPFILE
+  dump_packet(DUMP_TFTP, (void *)packet, len, NULL, (union mysockaddr *)&peer, TFTP_PORT);
+#endif
   
   if (is_err)
     free_transfer(transfer);
@@ -492,7 +500,7 @@ void tftp_request(struct listener *listen, time_t now)
     }
 }
  
-static struct tftp_file *check_tftp_fileperm(ssize_t *len, char *prefix)
+static struct tftp_file *check_tftp_fileperm(ssize_t *len, char *prefix, char *client)
 {
   char *packet = daemon->packet, *namebuff = daemon->namebuff;
   struct tftp_file *file;
@@ -509,7 +517,7 @@ static struct tftp_file *check_tftp_fileperm(ssize_t *len, char *prefix)
     {
       if (errno == ENOENT)
 	{
-	  *len = tftp_err(ERR_FNF, packet, _("file %s not found"), namebuff);
+	  *len = tftp_err(ERR_FNF, packet, _("file %s not found for %s"), namebuff, client);
 	  return NULL;
 	}
       else if (errno == EACCES)
@@ -562,8 +570,7 @@ static struct tftp_file *check_tftp_fileperm(ssize_t *len, char *prefix)
   return file;
   
  perm:
-  errno = EACCES;
-  *len =  tftp_err(ERR_PERM, packet, _("cannot access %s: %s"), namebuff);
+  *len =  tftp_err(ERR_PERM, packet, _("cannot access %s: %s"), namebuff, strerror(EACCES));
   if (fd != -1)
     close(fd);
   return NULL;
@@ -599,8 +606,12 @@ void check_tftp_listeners(time_t now)
 		{
 		  /* Wrong source address. See rfc1350 para 4. */
 		  prettyprint_addr(&peer, daemon->addrbuff);
-		  len = tftp_err(ERR_TID, daemon->packet, _("ignoring packet from %s (TID mismatch)"), daemon->addrbuff);
-		  sendto(transfer->sockfd, daemon->packet, len, 0, &peer.sa, sa_len(&peer));
+		  len = tftp_err(ERR_TID, daemon->packet, _("ignoring packet from %s (TID mismatch)"), daemon->addrbuff, NULL);
+		  while(retry_send(sendto(transfer->sockfd, daemon->packet, len, 0, &peer.sa, sa_len(&peer))));
+
+#ifdef HAVE_DUMPFILE
+		  dump_packet(DUMP_TFTP, (void *)daemon->packet, len, NULL, (union mysockaddr *)&peer, TFTP_PORT);
+#endif
 		}
 	    }
 	}
@@ -635,9 +646,14 @@ void check_tftp_listeners(time_t now)
 	    }
 
 	  if (len != 0)
-	    send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), daemon->packet, len,
-		      &transfer->peer, &transfer->source, transfer->if_index);
-	  	  
+	    {
+	      send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), daemon->packet, len,
+			&transfer->peer, &transfer->source, transfer->if_index);
+#ifdef HAVE_DUMPFILE
+	      dump_packet(DUMP_TFTP, (void *)daemon->packet, len, NULL, (union mysockaddr *)&transfer->peer, TFTP_PORT);
+#endif
+	    }
+	  
 	  if (endcon || len == 0)
 	    {
 	      strcpy(daemon->namebuff, transfer->file->filename);
@@ -743,22 +759,21 @@ static void sanitise(char *buf)
 }
 
 #define MAXMESSAGE 500 /* limit to make packet < 512 bytes and definitely smaller than buffer */ 
-static ssize_t tftp_err(int err, char *packet, char *message, char *file)
+static ssize_t tftp_err(int err, char *packet, char *message, char *file, char *arg2)
 {
   struct errmess {
     unsigned short op, err;
     char message[];
   } *mess = (struct errmess *)packet;
   ssize_t len, ret = 4;
-  char *errstr = strerror(errno);
-  
+    
   memset(packet, 0, daemon->packet_buff_sz);
   if (file)
     sanitise(file);
   
   mess->op = htons(OP_ERR);
   mess->err = htons(err);
-  len = snprintf(mess->message, MAXMESSAGE,  message, file, errstr);
+  len = snprintf(mess->message, MAXMESSAGE,  message, file, arg2);
   ret += (len < MAXMESSAGE) ? len + 1 : MAXMESSAGE; /* include terminating zero */
   
   if (err != ERR_FNF || !option_bool(OPT_QUIET_TFTP))
@@ -772,7 +787,7 @@ static ssize_t tftp_err_oops(char *packet, const char *file)
   /* May have >1 refs to file, so potentially mangle a copy of the name */
   if (file != daemon->namebuff)
     strcpy(daemon->namebuff, file);
-  return tftp_err(ERR_NOTDEF, packet, _("cannot read %s: %s"), daemon->namebuff);
+  return tftp_err(ERR_NOTDEF, packet, _("cannot read %s: %s"), daemon->namebuff, strerror(errno));
 }
 
 /* return -1 for error, zero for done. */

src/ubus.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by

src/util.c

@@ -1,4 +1,4 @@
-/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
+/* dnsmasq is Copyright (c) 2000-2022 Simon Kelley
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -115,7 +115,8 @@ u64 rand64(void)
   return (u64)out[outleft+1] + (((u64)out[outleft]) << 32);
 }
 
-/* returns 2 if names is OK but contains one or more underscores */
+/* returns 1 if name is OK and ascii printable
+ * returns 2 if name should be processed by IDN */
 static int check_name(char *in)
 {
   /* remove trailing . 
@@ -123,7 +124,9 @@ static int check_name(char *in)
   size_t dotgap = 0, l = strlen(in);
   char c;
   int nowhite = 0;
+  int idn_encode = 0;
   int hasuscore = 0;
+  int hasucase = 0;
   
   if (l == 0 || l > MAXDNAME) return 0;
   
@@ -136,28 +139,49 @@ static int check_name(char *in)
   for (; (c = *in); in++)
     {
       if (c == '.')
-	dotgap = 0;
+        dotgap = 0;
       else if (++dotgap > MAXLABEL)
-	return 0;
+        return 0;
       else if (isascii((unsigned char)c) && iscntrl((unsigned char)c)) 
-	/* iscntrl only gives expected results for ascii */
-	return 0;
-#if !defined(HAVE_IDN) && !defined(HAVE_LIBIDN2)
+        /* iscntrl only gives expected results for ascii */
+        return 0;
       else if (!isascii((unsigned char)c))
-	return 0;
+#if !defined(HAVE_IDN) && !defined(HAVE_LIBIDN2)
+        return 0;
+#else
+        idn_encode = 1;
 #endif
       else if (c != ' ')
-	{
-	  nowhite = 1;
-	  if (c == '_')
-	    hasuscore = 1;
-	}
+        {
+          nowhite = 1;
+#if defined(HAVE_LIBIDN2) && (!defined(IDN2_VERSION_NUMBER) || IDN2_VERSION_NUMBER < 0x02000003)
+          if (c == '_')
+            hasuscore = 1;
+#else
+          (void)hasuscore;
+#endif
+
+#if defined(HAVE_IDN) || defined(HAVE_LIBIDN2)
+          if (c >= 'A' && c <= 'Z')
+            hasucase = 1;
+#else
+          (void)hasucase;
+#endif
+        }
     }
 
   if (!nowhite)
     return 0;
 
-  return hasuscore ? 2 : 1;
+#if defined(HAVE_LIBIDN2) && (!defined(IDN2_VERSION_NUMBER) || IDN2_VERSION_NUMBER < 0x02000003)
+  /* Older libidn2 strips underscores, so don't do IDN processing
+     if the name has an underscore unless it also has non-ascii characters. */
+  idn_encode = idn_encode || (hasucase && !hasuscore);
+#else
+  idn_encode = idn_encode || hasucase;
+#endif
+
+  return (idn_encode) ? 2 : 1;
 }
 
 /* Hostnames have a more limited valid charset than domain names
@@ -204,17 +228,11 @@ char *canonicalise(char *in, int *nomem)
   if (!(rc = check_name(in)))
     return NULL;
   
-#if defined(HAVE_LIBIDN2) && (!defined(IDN2_VERSION_NUMBER) || IDN2_VERSION_NUMBER < 0x02000003)
-  /* older libidn2 strips underscores, so don't do IDN processing
-     if the name has an underscore (check_name() returned 2) */
-  if (rc != 2)
-#endif
 #if defined(HAVE_IDN) || defined(HAVE_LIBIDN2)
+  if (rc == 2)
     {
 #  ifdef HAVE_LIBIDN2
       rc = idn2_to_ascii_lz(in, &ret, IDN2_NONTRANSITIONAL);
-      if (rc == IDN2_DISALLOWED)
-	rc = idn2_to_ascii_lz(in, &ret, IDN2_TRANSITIONAL);
 #  else
       rc = idna_to_ascii_lz(in, &ret, 0);
 #  endif
@@ -234,12 +252,14 @@ char *canonicalise(char *in, int *nomem)
       
       return ret;
     }
+#else
+  (void)rc;
 #endif
   
   if ((ret = whine_malloc(strlen(in)+1)))
     strcpy(ret, in);
   else if (nomem)
-    *nomem = 1;    
+    *nomem = 1;
 
   return ret;
 }
@@ -347,7 +367,7 @@ int sa_len(union mysockaddr *addr)
 }
 
 /* don't use strcasecmp and friends here - they may be messed up by LOCALE */
-int hostname_isequal(const char *a, const char *b)
+int hostname_order(const char *a, const char *b)
 {
   unsigned int c1, c2;
   
@@ -360,11 +380,19 @@ int hostname_isequal(const char *a, const char *b)
     if (c2 >= 'A' && c2 <= 'Z')
       c2 += 'a' - 'A';
     
-    if (c1 != c2)
-      return 0;
+    if (c1 < c2)
+      return -1;
+    else if (c1 > c2)
+      return 1;
+    
   } while (c1);
   
-  return 1;
+  return 0;
+}
+
+int hostname_isequal(const char *a, const char *b)
+{
+  return hostname_order(a, b) == 0;
 }
 
 /* is b equal to or a subdomain of a return 2 for equal, 1 for subdomain */
@@ -408,13 +436,12 @@ int hostname_issubdomain(char *a, char *b)
 time_t dnsmasq_time(void)
 {
 #ifdef HAVE_BROKEN_RTC
-  struct tms dummy;
-  static long tps = 0;
+  struct timespec ts;
 
-  if (tps == 0)
-    tps = sysconf(_SC_CLK_TCK);
+  if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
+    die(_("cannot read monotonic clock: %s"), NULL, EC_MISC);
 
-  return (time_t)(times(&dummy)/tps);
+  return ts.tv_sec;
 #else
   return time(NULL);
 #endif
@@ -528,7 +555,7 @@ void prettyprint_time(char *buf, unsigned int t)
       if ((x = (t/60)%60))
 	p += sprintf(&buf[p], "%um", x);
       if ((x = t%60))
-	p += sprintf(&buf[p], "%us", x);
+	sprintf(&buf[p], "%us", x);
     }
 }
 
@@ -574,7 +601,7 @@ int parse_hex(char *in, unsigned char *out, int maxlen,
 		  int j, bytes = (1 + (r - in))/2;
 		  for (j = 0; j < bytes; j++)
 		    { 
-		      char sav = sav;
+		      char sav;
 		      if (j < bytes - 1)
 			{
 			  sav = in[(j+1)*2];