Man page update.

Also remove unused "isloop" field.

CHANGELOG

@@ -1,3 +1,17 @@
+version 2.63
+            Do duplicate dhcp-host address check in --test mode.
+
+	    Check that tftp-root directories are accessible before
+	    start-up. Thanks to Daniel Veillard for the initial patch.
+
+	    Allow more than one --tfp-root flag. The per-interface
+	    stuff is pointless without that.
+
+	    Add --bind-dynamic. A hybrid mode between the default and
+	    --bind-interfaces which copes with dynamically created
+	    interfaces. 
+
+
 version 2.62
             Update German translation. Thanks to Conrad Kostecki.
 

debian/changelog

@@ -1,3 +1,22 @@
+dnsmasq (2.63-1) unstable; urgency=low
+
+   * New upstream.
+
+ -- Simon Kelley <simon@thekelleys.org.uk>  Mon, 11 Jun 2012 21:55:35 +0000
+
+dnsmasq (2.62-3) unstable; urgency=low
+
+   * Do resolvconf and /etc/default startup logic when
+     starting with systemd. (closes: #675854)
+
+ -- Simon Kelley <simon@thekelleys.org.uk>  Mon, 11 Jun 2012 21:50:11 +0000
+
+dnsmasq (2.62-2) unstable; urgency=low
+
+   * Pass LDFLAGS to make to get hardening in linker.
+
+ -- Simon Kelley <simon@thekelleys.org.uk>  Thu, 7 Jun 2012 09:53:43 +0000
+
 dnsmasq (2.62-1) unstable; urgency=low
 
    * New upstream.

debian/init

@@ -259,6 +259,27 @@ case "$1" in
   dump-stats)
         kill -s USR1 `cat /var/run/dnsmasq/$NAME.pid`
 	;;
+  systemd-start-resolvconf)
+	start_resolvconf
+	;;
+  systemd-stop-resolvconf)
+	stop_resolvconf
+	;;
+  systemd-exec)
+#  --pid-file without argument disables writing a PIDfile, we don't need one with sytemd.
+# Enable DBus by default because we use DBus activation with systemd.
+	exec $DAEMON --keep-in-foreground --pid-file --enable-dbus \
+	    ${MAILHOSTNAME:+ -m $MAILHOSTNAME} \
+	    ${MAILTARGET:+ -t $MAILTARGET} \
+	    ${DNSMASQ_USER:+ -u $DNSMASQ_USER} \
+	    ${DNSMASQ_INTERFACES:+ $DNSMASQ_INTERFACES} \
+	    ${DHCP_LEASE:+ -l $DHCP_LEASE} \
+	    ${DOMAIN_SUFFIX:+ -s $DOMAIN_SUFFIX} \
+	    ${RESOLV_CONF:+ -r $RESOLV_CONF} \
+	    ${CACHESIZE:+ -c $CACHESIZE} \
+	    ${CONFIG_DIR:+ -7 $CONFIG_DIR} \
+	    ${DNSMASQ_OPTS:+ $DNSMASQ_OPTS} 
+	;;
   *)
 	echo "Usage: /etc/init.d/$NAME {start|stop|restart|force-reload|dump-stats|status}" >&2
 	exit 3

debian/rules

@@ -115,7 +115,7 @@ binary-arch:	checkroot
 		-d debian/base/usr/share/doc/$(package)/examples \
 	        -d debian/base/var/run \
 	        -d debian/base/var/lib/misc
-	make $(TARGET) PREFIX=/usr DESTDIR=`pwd`/debian/base CFLAGS="$(CFLAGS)" COPTS="$(COPTS)" CC=gcc
+	make $(TARGET) PREFIX=/usr DESTDIR=`pwd`/debian/base CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" COPTS="$(COPTS)" CC=gcc
 ifeq (,$(findstring nodocs,$(DEB_BUILD_OPTIONS)))
 	install -m 644 doc.html debian/base/usr/share/doc/$(package)/.
 	install -m 644 setup.html debian/base/usr/share/doc/$(package)/.
@@ -155,7 +155,7 @@ ifeq ($(DEB_BUILD_ARCH_OS),linux)
                        -d debian/utils/usr/share/man/man1 \
 	               -d debian/utils/usr/bin \
                        -d debian/utils/usr/share/doc/dnsmasq-utils
-	make -C contrib/wrt PREFIX=/usr DESTDIR=`pwd`/debian/utils CFLAGS="$(CFLAGS)" COPTS="$(COPTS)" CC=gcc
+	make -C contrib/wrt PREFIX=/usr DESTDIR=`pwd`/debian/utils CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" COPTS="$(COPTS)" CC=gcc
 	install -m 755 contrib/wrt/dhcp_release debian/utils/usr/bin/dhcp_release
 	install -m 644 contrib/wrt/dhcp_release.1 debian/utils/usr/share/man/man1/dhcp_release.1
 	gzip -9 debian/utils/usr/share/man/man1/dhcp_release.1

debian/systemd.service

@@ -8,22 +8,24 @@ BusName=uk.org.thekelleys.dnsmasq
 # Test the config file and refuse starting if it is not valid.
 ExecStartPre=/usr/sbin/dnsmasq --test
 
-# Enable DBus by default because we use DBus activation.
+# We run dnsmasq via the /etc/init.d/dnsmasq script which acts as a
+# wrapper picking up extra configuration files and then execs dnsmasq
+# itself, when called with the "systemd-exec" function.
 #
-# Drop privileges and become the 'dnsmasq' user. It is recommended by dnsmasq
-# upstream to run dnsmasq as an isolated user that does not run any other
-# processes, owns no files and has no shell. The default 'nobody' user has a
-# shell and might be used for other processes.
+# It also adds the command-line flags
+#    --keep-in-foreground --pid-file --enable-dbus 
+# to disable writing a pid-file (not needed with systemd) and 
+# enable DBus by default because we use DBus activation.
 #
-# Debian-specific: add /etc/dnsmasq.d to config search path (with the exception
-# of .dpkg-*). Packages such as libvirt leave config files there.
-#
-# --pid-file without argument disables writing a PIDfile, we don't need one.
-ExecStart=/usr/sbin/dnsmasq -k \
-          --enable-dbus \
-          --user=dnsmasq \
-          -7 /etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new \
-          --pid-file
+ExecStart=/etc/init.d/dnsmasq systemd-exec
+
+# The systemd-*-resolvconf functions configure (and deconfigure)
+# resolvconf to work with the dnsmasq DNS server. They're called liek
+# this to get correct error handling (ie don't start-resolvconf if the 
+# dnsmasq daemon fails to start.
+ExecStartPost=/etc/init.d/dnsmasq systemd-start-resolvconf
+ExecStop=/etc/init.d/dnsmasq systemd-stop-resolvconf
+
 
 ExecReload=/bin/kill -HUP $MAINPID
 

man/dnsmasq.8

@@ -204,6 +204,17 @@ running another nameserver (or another instance of dnsmasq) on the
 same machine. Setting this option also enables multiple instances of
 dnsmasq which provide DHCP service to run in the same machine.
 .TP
+.B --bind-dynamic
+Enable a network mode which is a hybrid between 
+.B --bind-interfaces
+and the default. Dnsmasq binds the address of indivdual interfaces,
+allowing multiple dnsmasq instances, but if new interfaces or
+addresses appear, it automatically listens on those (subject to any
+access-control configuration). This makes dynamically created
+interfaces work in the same way as the default. Implementing this
+option requires non-standard networking APIs and it is only availble
+under Linux. On other platforms it falls-back to --bind-interfaces mode.
+.TP
 .B \-y, --localise-queries
 Return answers to DNS queries from /etc/hosts which depend on the interface over which the query was
 received. If a name in /etc/hosts has more than one address associated with

src/dhcp.c

@@ -66,7 +66,7 @@ static int make_fd(int port)
   /* When bind-interfaces is set, there might be more than one dnmsasq
      instance binding port 67. That's OK if they serve different networks.
      Need to set REUSEADDR to make this posible, or REUSEPORT on *BSD. */
-  if (option_bool(OPT_NOWILD))
+  if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND))
     {
 #ifdef SO_REUSEPORT
       int rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt));

src/dnsmasq.c

@@ -114,8 +114,16 @@ int main (int argc, char **argv)
       set_option_bool(OPT_NOWILD);
     }
 #  endif
+  
+  /* -- bind-dynamic not supported on !Linux, fall back to --bind-interfaces */
+  if (option_bool(OPT_CLEVERBIND))
+    {
+      bind_fallback = 1;
+      set_option_bool(OPT_NOWILD);
+      reset_option_bool(OPT_CLVERBIND);
+    }
 #endif
-
+  
 #ifndef HAVE_TFTP
   if (daemon->tftp_unlimited || daemon->tftp_interfaces)
     die(_("TFTP server not available: set HAVE_TFTP in src/config.h"), NULL, EC_BADCONF);
@@ -185,6 +193,9 @@ int main (int argc, char **argv)
 #ifdef HAVE_LINUX_NETWORK
   /* After lease_init */
   netlink_init();
+
+  if (option_bool(OPT_NOWILD) && option_bool(OPT_CLEVERBIND))
+    die(_("cannot set --bind-interfaces and --bind-dynamic"), NULL, EC_BADCONF);
 #endif
 
 #ifdef HAVE_DHCP6
@@ -202,13 +213,14 @@ int main (int argc, char **argv)
   if (!enumerate_interfaces())
     die(_("failed to find list of interfaces: %s"), NULL, EC_MISC);
   
-  if (option_bool(OPT_NOWILD)) 
+  if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND)) 
     {
       create_bound_listeners(1);
-
-      for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next)
-	if (if_tmp->name && !if_tmp->used)
-	  die(_("unknown interface %s"), if_tmp->name, EC_BADNET);
+      
+      if (!option_bool(OPT_CLEVERBIND))
+	for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next)
+	  if (if_tmp->name && !if_tmp->used)
+	    die(_("unknown interface %s"), if_tmp->name, EC_BADNET);
 
 #if defined(HAVE_LINUX_NETWORK) && defined(HAVE_DHCP)
       /* after enumerate_interfaces()  */
@@ -425,8 +437,9 @@ int main (int argc, char **argv)
 #if defined(HAVE_LINUX_NETWORK)	  
 	  /* On linux, we keep CAP_NETADMIN (for ARP-injection) and
 	     CAP_NET_RAW (for icmp) if we're doing dhcp. If we have yet to bind 
-	     ports because of DAD, we need CAP_NET_BIND_SERVICE too. */
-	  if (is_dad_listeners())
+	     ports because of DAD, or we're doing it dynamically,
+	     we need CAP_NET_BIND_SERVICE too. */
+	  if (is_dad_listeners() || option_bool(OPT_CLEVERBIND))
 	    data->effective = data->permitted = data->inheritable =
 	      (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | 
 	      (1 << CAP_SETUID) | (1 << CAP_NET_BIND_SERVICE);
@@ -474,7 +487,7 @@ int main (int argc, char **argv)
 	    }     
 
 #ifdef HAVE_LINUX_NETWORK
-	 if (is_dad_listeners())
+	  if (is_dad_listeners() || option_bool(OPT_CLEVERBIND))
 	   data->effective = data->permitted =
 	     (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | (1 << CAP_NET_BIND_SERVICE);
 	 else
@@ -498,6 +511,34 @@ int main (int argc, char **argv)
     prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 #endif
 
+#ifdef HAVE_TFTP
+  if (daemon->tftp_unlimited || daemon->tftp_interfaces)
+    {
+      DIR *dir;
+      struct tftp_prefix *p;
+      
+      if (daemon->tftp_prefix)
+	{
+	  if (!((dir = opendir(daemon->tftp_prefix))))
+	    {
+	      send_event(err_pipe[1], EVENT_TFTP_ERR, errno, daemon->tftp_prefix);
+	      _exit(0);
+	    }
+	  closedir(dir);
+	}
+
+      for (p = daemon->if_prefix; p; p = p->next)
+	{
+	  if (!((dir = opendir(p->prefix))))
+	   {
+	     send_event(err_pipe[1], EVENT_TFTP_ERR, errno, p->prefix);
+	     _exit(0);
+	   } 
+	  closedir(dir);
+	}
+    }
+#endif
+
   if (daemon->port == 0)
     my_syslog(LOG_INFO, _("started, version %s DNS disabled"), VERSION);
   else if (daemon->cachesize != 0)
@@ -995,6 +1036,9 @@ static void fatal_event(struct event_desc *ev, char *msg)
     
     case EVENT_LUA_ERR:
       die(_("failed to load Lua script: %s"), msg, EC_MISC);
+
+    case EVENT_TFTP_ERR:
+      die(_("TFTP directory %s inaccessible: %s"), msg, EC_FILE);
     }
 }	
       
@@ -1321,7 +1365,7 @@ static void check_dns_listeners(fd_set *set, time_t now)
 	      getsockname(confd, (struct sockaddr *)&tcp_addr, &tcp_len) == -1)
 	    continue;
 	  
-	  if (option_bool(OPT_NOWILD))
+	  if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND))
 	    iface = listener->iface; /* May be NULL */
 	  else
 	    {
@@ -1338,7 +1382,7 @@ static void check_dns_listeners(fd_set *set, time_t now)
 		    break;
 	    }
 	  
-	  if (!iface && !option_bool(OPT_NOWILD))
+	  if (!iface && !(option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND)))
 	    {
 	      shutdown(confd, SHUT_RDWR);
 	      close(confd);

src/dnsmasq.h

@@ -159,6 +159,7 @@ struct event_desc {
 #define EVENT_LOG_ERR   17
 #define EVENT_FORK_ERR  18
 #define EVENT_LUA_ERR   19
+#define EVENT_TFTP_ERR  20
 
 /* Exit codes. */
 #define EC_GOOD        0
@@ -218,7 +219,8 @@ struct event_desc {
 #define OPT_FQDN_UPDATE    36
 #define OPT_RA             37
 #define OPT_TFTP_LC        38
-#define OPT_LAST           39
+#define OPT_CLEVERBIND     39
+#define OPT_LAST           40
 
 /* extra flags for my_syslog, we use a couple of facilities since they are known 
    not to occupy the same bits as priorities, no matter how syslog.h is set up. */
@@ -424,7 +426,7 @@ struct listener {
 struct iname {
   char *name;
   union mysockaddr addr;
-  int isloop, used;
+  int used;
   struct iname *next;
 };
 
@@ -930,6 +932,7 @@ char *option_string(int prot, unsigned int opt, unsigned char *val,
 		    int opt_len, char *buf, int buf_len);
 void reread_dhcp(void);
 void set_option_bool(unsigned int opt);
+void reset_option_bool(unsigned int opt);
 struct hostsfile *expand_filelist(struct hostsfile *list);
 
 /* forward.c */

src/forward.c

@@ -436,7 +436,7 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
   if (udpfd != -1)
     {
       plen = setup_reply(header, plen, addrp, flags, daemon->local_ttl);
-      send_from(udpfd, option_bool(OPT_NOWILD), (char *)header, plen, udpaddr, dst_addr, dst_iface);
+      send_from(udpfd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), (char *)header, plen, udpaddr, dst_addr, dst_iface);
     }
 
   return 0;
@@ -624,7 +624,7 @@ void reply_query(int fd, int family, time_t now)
 	{
 	  header->id = htons(forward->orig_id);
 	  header->hb4 |= HB4_RA; /* recursion if available */
-	  send_from(forward->fd, option_bool(OPT_NOWILD), daemon->packet, nn, 
+	  send_from(forward->fd, option_bool(OPT_NOWILD) || option_bool (OPT_CLEVERBIND), daemon->packet, nn, 
 		    &forward->source, &forward->dest, forward->iface);
 	}
       free_frec(forward); /* cancel */
@@ -819,8 +819,8 @@ void receive_query(struct listener *listen, time_t now)
 		      dst_addr_4, netmask, now);
   if (m >= 1)
     {
-      send_from(listen->fd, option_bool(OPT_NOWILD), (char *)header, 
-		m, &source_addr, &dst_addr, if_index);
+      send_from(listen->fd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND),
+		(char *)header, m, &source_addr, &dst_addr, if_index);
       daemon->local_answer++;
     }
   else if (forward_query(listen->fd, &source_addr, &dst_addr, if_index,

src/netlink.c

@@ -38,7 +38,7 @@
 static struct iovec iov;
 static u32 netlink_pid;
 
-static void nl_err(struct nlmsghdr *h);
+static int nl_async(struct nlmsghdr *h);
 static void nl_routechange(struct nlmsghdr *h);
 
 void netlink_init(void)
@@ -49,10 +49,13 @@ void netlink_init(void)
   addr.nl_family = AF_NETLINK;
   addr.nl_pad = 0;
   addr.nl_pid = 0; /* autobind */
-#ifdef HAVE_IPV6
-  addr.nl_groups = RTMGRP_IPV4_ROUTE | RTMGRP_IPV6_ROUTE;
-#else
   addr.nl_groups = RTMGRP_IPV4_ROUTE;
+  if (option_bool(OPT_CLEVERBIND))
+    addr.nl_groups |= RTMGRP_IPV4_IFADDR;
+#ifdef HAVE_IPV6
+  addr.nl_groups |= RTMGRP_IPV6_ROUTE;
+  if (daemon->ra_contexts || option_bool(OPT_CLEVERBIND))
+    addr.nl_groups |= RTMGRP_IPV6_IFADDR;
 #endif
   
   /* May not be able to have permission to set multicast groups don't die in that case */
@@ -136,7 +139,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
   struct nlmsghdr *h;
   ssize_t len;
   static unsigned int seq = 0;
-  int callback_ok = 1;
+  int callback_ok = 1, newaddr = 0;
 
   struct {
     struct nlmsghdr nlh;
@@ -182,12 +185,24 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	}
 
       for (h = (struct nlmsghdr *)iov.iov_base; NLMSG_OK(h, (size_t)len); h = NLMSG_NEXT(h, len))
-	if (h->nlmsg_seq != seq || h->nlmsg_pid != netlink_pid)
-	  nl_routechange(h); /* May be multicast arriving async */
-	else if (h->nlmsg_type == NLMSG_ERROR)
-	  nl_err(h);
+	if (h->nlmsg_seq != seq || h->nlmsg_pid != netlink_pid || h->nlmsg_type == NLMSG_ERROR)
+	  {
+	    /* May be multicast arriving async */
+	    if (nl_async(h) && option_bool(OPT_CLEVERBIND))
+	      newaddr = 1; 
+	  }
 	else if (h->nlmsg_type == NLMSG_DONE)
-	  return callback_ok;
+	  {
+	    /* handle async new interface address arrivals, these have to be done
+	       after we complete as we're not re-entrant */
+	    if (newaddr) 
+	      {
+		enumerate_interfaces();
+		create_bound_listeners(0);
+	      }
+	    
+	    return callback_ok;
+	  }
 	else if (h->nlmsg_type == RTM_NEWADDR && family != AF_UNSPEC && family != AF_LOCAL)
 	  {
 	    struct ifaddrmsg *ifa = NLMSG_DATA(h);  
@@ -295,7 +310,7 @@ void netlink_multicast(void)
 {
   ssize_t len;
   struct nlmsghdr *h;
-  int flags;
+  int flags, newaddr = 0;
   
   /* don't risk blocking reading netlink messages here. */
   if ((flags = fcntl(daemon->netlinkfd, F_GETFL)) == -1 ||
@@ -303,71 +318,83 @@ void netlink_multicast(void)
     return;
   
   if ((len = netlink_recv()) != -1)
-    {
-      for (h = (struct nlmsghdr *)iov.iov_base; NLMSG_OK(h, (size_t)len); h = NLMSG_NEXT(h, len))
-	if (h->nlmsg_type == NLMSG_ERROR)
-	  nl_err(h);
-	else
-	  nl_routechange(h);
-    }
-
-  /* restore non-blocking status */
-  fcntl(daemon->netlinkfd, F_SETFL, flags); 
-}
-
-static void nl_err(struct nlmsghdr *h)
-{
-  struct nlmsgerr *err = NLMSG_DATA(h);
+    for (h = (struct nlmsghdr *)iov.iov_base; NLMSG_OK(h, (size_t)len); h = NLMSG_NEXT(h, len))
+      if (nl_async(h) && option_bool(OPT_CLEVERBIND))
+	newaddr = 1;
   
-  if (err->error != 0)
-    my_syslog(LOG_ERR, _("netlink returns error: %s"), strerror(-(err->error)));
+  /* restore non-blocking status */
+  fcntl(daemon->netlinkfd, F_SETFL, flags);
+
+  if (newaddr) 
+    {
+      enumerate_interfaces();
+      create_bound_listeners(0);
+    }
 }
 
+static int nl_async(struct nlmsghdr *h)
+{
+  if (h->nlmsg_type == NLMSG_ERROR)
+    {
+      struct nlmsgerr *err = NLMSG_DATA(h);
+      my_syslog(LOG_ERR, _("netlink returns error: %s"), strerror(-(err->error)));
+      return 0;
+    }
+  else if (h->nlmsg_pid == 0 && h->nlmsg_type == RTM_NEWROUTE) 
+    {
+      nl_routechange(h);
+      return 0;
+    }
+  else if (h->nlmsg_type == RTM_NEWADDR) 
+	{
+#ifdef HAVE_DHCP6
+	  /* force RAs to sync new network and pick up new interfaces.  */
+	  if (daemon->ra_contexts)
+	    {
+	      schedule_subnet_map();
+	      ra_start_unsolicted(dnsmasq_time(), NULL);
+	      /* cause lease_update_file to run after we return, in case we were called from
+		 iface_enumerate and can't re-enter it now */
+	      send_alarm(0, 0);
+	    }
+	  return 1; /* clever bind mode - rescan */
+	}
+#endif	 
+
+  return 0;
+}
+  
 /* We arrange to receive netlink multicast messages whenever the network route is added.
    If this happens and we still have a DNS packet in the buffer, we re-send it.
    This helps on DoD links, where frequently the packet which triggers dialling is
    a DNS query, which then gets lost. By re-sending, we can avoid the lookup
-   failing. Note that we only accept these messages from the kernel (pid == 0) */ 
+   failing. */ 
 static void nl_routechange(struct nlmsghdr *h)
 {
-  if (h->nlmsg_pid == 0 && h->nlmsg_type == RTM_NEWROUTE)
+  struct rtmsg *rtm = NLMSG_DATA(h);
+  int fd;
+  
+  if (rtm->rtm_type != RTN_UNICAST || rtm->rtm_scope != RT_SCOPE_LINK)
+    return;
+  
+  /* Force re-reading resolv file right now, for luck. */
+  daemon->last_resolv = 0;
+  
+  if (daemon->srv_save)
     {
-      struct rtmsg *rtm = NLMSG_DATA(h);
-      int fd;
-
-      if (rtm->rtm_type != RTN_UNICAST || rtm->rtm_scope != RT_SCOPE_LINK)
+      if (daemon->srv_save->sfd)
+	fd = daemon->srv_save->sfd->fd;
+      else if (daemon->rfd_save && daemon->rfd_save->refcount != 0)
+	fd = daemon->rfd_save->fd;
+      else
 	return;
-
-      /* Force re-reading resolv file right now, for luck. */
-      daemon->last_resolv = 0;
       
-#ifdef HAVE_DHCP6
-      /* force RAs to sync new network and pick up new interfaces.  */
-      if (daemon->ra_contexts)
-	{
-	  schedule_subnet_map();
-	  ra_start_unsolicted(dnsmasq_time(), NULL);
-	  /* cause lease_update_file to run after we return, in case we were called from
-	     iface_enumerate and can't re-enter it now */
-	  send_alarm(0, 0);
-	}
-#endif
-
-      if (daemon->srv_save)
-	{
-	  if (daemon->srv_save->sfd)
-	    fd = daemon->srv_save->sfd->fd;
-	  else if (daemon->rfd_save && daemon->rfd_save->refcount != 0)
-	    fd = daemon->rfd_save->fd;
-	  else
-	    return;
-	  
-	  while(sendto(fd, daemon->packet, daemon->packet_len, 0,
-		       &daemon->srv_save->addr.sa, sa_len(&daemon->srv_save->addr)) == -1 && retry_send()); 
-	}
+      while(sendto(fd, daemon->packet, daemon->packet_len, 0,
+		   &daemon->srv_save->addr.sa, sa_len(&daemon->srv_save->addr)) == -1 && retry_send()); 
     }
 }
 
+
 #endif
 
       

src/network.c

@@ -207,17 +207,14 @@ static int iface_allowed(struct irec **irecp, int if_index,
       struct iname *lo;
       for (lo = daemon->if_names; lo; lo = lo->next)
 	if (lo->name && strcmp(lo->name, ifr.ifr_name) == 0)
-	  {
-	    lo->isloop = 1;
-	    break;
-	  }
+	  break;
       
       if (!lo && 
 	  (lo = whine_malloc(sizeof(struct iname))) &&
 	  (lo->name = whine_malloc(strlen(ifr.ifr_name)+1)))
 	{
 	  strcpy(lo->name, ifr.ifr_name);
-	  lo->isloop = lo->used = 1;
+	  lo->used = 1;
 	  lo->next = daemon->if_names;
 	  daemon->if_names = lo;
 	}
@@ -350,6 +347,7 @@ static int make_sock(union mysockaddr *addr, int type, int dienow)
   if ((fd = socket(family, type, 0)) == -1)
     {
       int port;
+      char *s;
 
       /* No error if the kernel just doesn't support this IP flavour */
       if (errno == EPROTONOSUPPORT ||
@@ -358,15 +356,15 @@ static int make_sock(union mysockaddr *addr, int type, int dienow)
 	return -1;
       
     err:
+      port = prettyprint_addr(addr, daemon->addrbuff);
+      if (!option_bool(OPT_NOWILD) && !option_bool(OPT_CLEVERBIND))
+	sprintf(daemon->addrbuff, "port %d", port);
+      s = _("failed to create listening socket for %s: %s");
+      
       if (dienow)
-	{
-	  port = prettyprint_addr(addr, daemon->namebuff);
-	  if (!option_bool(OPT_NOWILD))
-	    sprintf(daemon->namebuff, "port %d", port);
-	  die(_("failed to create listening socket for %s: %s"), 
-	      daemon->namebuff, EC_BADNET);
-	
-	}
+	die(s, daemon->addrbuff, EC_BADNET);
+      
+      my_syslog(LOG_ERR, s, daemon->addrbuff, strerror(errno));
       return -1;
     }	
 
@@ -546,7 +544,7 @@ void create_bound_listeners(int dienow)
 
   for (if_tmp = daemon->if_addrs; if_tmp; if_tmp = if_tmp->next)
     if (!if_tmp->used && 
-	(new = create_listeners(&if_tmp->addr, 1, dienow)))
+	(new = create_listeners(&if_tmp->addr, daemon->tftp_unlimited, dienow)))
       {
 	new->iface = NULL;
 	new->next = daemon->listeners;

src/option.c

@@ -119,6 +119,7 @@ struct myoption {
 #define LOPT_HOST_REC  308
 #define LOPT_TFTP_LC   309
 #define LOPT_RR        310
+#define LOPT_CLVERBIND 311
 
 #ifdef HAVE_GETOPT_LONG
 static const struct option opts[] =  
@@ -243,6 +244,7 @@ static const struct myoption opts[] =
     { "enable-ra", 0, 0, LOPT_RA },
     { "dhcp-duid", 1, 0, LOPT_DUID },
     { "host-record", 1, 0, LOPT_HOST_REC },
+    { "bind-dynamic", 0, 0, LOPT_CLVERBIND },
     { NULL, 0, 0, 0 }
   };
 
@@ -341,7 +343,7 @@ static struct {
   { LOPT_NO_NAMES, ARG_DUP, "[=tag:<tag>]...", gettext_noop("Ignore hostnames provided by DHCP clients."), NULL },
   { LOPT_OVERRIDE, OPT_NO_OVERRIDE, NULL, gettext_noop("Do NOT reuse filename and server fields for extra DHCP options."), NULL },
   { LOPT_TFTP, ARG_DUP, "[=<interface>]", gettext_noop("Enable integrated read-only TFTP server."), NULL },
-  { LOPT_PREFIX, ARG_ONE, "<dir>[,<iface>]", gettext_noop("Export files by TFTP only from the specified subtree."), NULL },
+  { LOPT_PREFIX, ARG_DUP, "<dir>[,<iface>]", gettext_noop("Export files by TFTP only from the specified subtree."), NULL },
   { LOPT_APREF, OPT_TFTP_APREF, NULL, gettext_noop("Add client IP address to tftp-root."), NULL },
   { LOPT_SECURE, OPT_TFTP_SECURE, NULL, gettext_noop("Allow access only to files owned by the user running dnsmasq."), NULL },
   { LOPT_TFTP_MAX, ARG_ONE, "<integer>", gettext_noop("Maximum number of conncurrent TFTP transfers (defaults to %s)."), "#" },
@@ -374,6 +376,7 @@ static struct {
   { LOPT_DUID, ARG_ONE, "<enterprise>,<duid>", gettext_noop("Specify DUID_EN-type DHCPv6 server DUID"), NULL },
   { LOPT_HOST_REC, ARG_DUP, "<name>,<address>", gettext_noop("Specify host (A/AAAA and PTR) records"), NULL },
   { LOPT_RR, ARG_DUP, "<name>,<RR-number>,[<data>]", gettext_noop("Specify arbitrary DNS resource record"), NULL },
+  { LOPT_CLVERBIND, OPT_CLEVERBIND, NULL, gettext_noop("Bind to interfaces in use - check for new interfaces"), NULL},
   { 0, 0, NULL, NULL, NULL }
 }; 
 
@@ -1116,6 +1119,14 @@ void set_option_bool(unsigned int opt)
     daemon->options2 |= 1u << (opt - 32);
 }
 
+void reset_option_bool(unsigned int opt)
+{
+  if (opt < 32)
+    daemon->options &= ~(1u << opt);
+  else
+    daemon->options2 &= ~(1u << (opt - 32));
+}
+
 static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 {      
   int i;
@@ -1570,7 +1581,7 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 	/* new->name may be NULL if someone does
 	   "interface=" to disable all interfaces except loop. */
 	new->name = opt_string_alloc(arg);
-	new->isloop = new->used = 0;
+	new->used = 0;
 	arg = comma;
       } while (arg);
       break;
@@ -1640,7 +1651,8 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 	    option = '?'; /* error */
 	    break;
 	  }
-	
+
+	new->used = 0;
 	daemon->if_addrs = new;
 	arg = comma;
       } while (arg);
@@ -3762,6 +3774,9 @@ void read_opts(int argc, char **argv, char *compile_opts)
 
   if (testmode)
     {
+      /* Can cause a call to die() */
+      check_dhcp_hosts(1);
+      
       fprintf(stderr, "dnsmasq: %s.\n", _("syntax check OK"));
       exit(0);
     }