Fix 5846f749e5

Not sure how that bug got in there. Very (un)lucky choice
of test data, or last-minute "it'll be fine" modification I guess.

It was late, I can't remember.

Thanks to Dominik Derrigs for spotting the problem.

CHANGELOG

@@ -19,6 +19,48 @@ version 2.92
 	would fail to spot an invalid domain. Thanks to Graham Clinch
 	for spotting the problem.
 
+	Add --log-queries=auth option to only log replies from the auth DNS
+	facility.
+
+	Fix some edge-cases with domains and --address and --server. There
+	has been some regressions with this in previous releases. This change
+	fixes the priority order from loqwer to highest as:
+	--address with a IPv4 or IPv6 address (as long as the query matches the type)
+        --address with # for all-zeros, as long as the query is A or AAAA)
+        --address with no address, which returns NXDOMAIN or NOERROR for all types.
+        --server with address set to # to use the unqualified servers.
+        --server with matching domain.
+        --server without domain or from /etc/resolv.conf.
+
+	Fix problems with ipset or nftset and TCP DNS transport. Previously
+	this was racy, and insertion of addresses could fail on a busy server
+	when DNS-over-TCP transport was involved.
+
+	DNSSEC validation change for reverse lookups in RFC-1918 ranges and friends.
+    	The large public DNS services seem not to return proof-of-nonexistence
+	for DS records at the start of RFC-1918 in-addr.arpa domains and the their
+	IPv6 equivalents. 10.in-addr.arpa, 168.192.in-addr.arpa etc.
+	Since dnsmasq already has an option which instructs it not bother
+	upstream servers with pointless queries about these address ranges,
+	namely --bogus-priv, we extend that to enable behaviour which allows
+	dnsmasq to assume that insecure NXDOMAIN replies for these domains
+	are expected and to assume that the domains are legitimately unsigned.
+	This behaviour only matters when some address range is directed to
+	another upstream server using --rev-server. In that case it allows
+	replies from that server to pass DNSSEC validation. Without such a
+	server configured, queries are never sent upstream so they are never
+	validated and the new behaviour is moot.
+
+	Add support for leasequery to the dnsmasq DHCPv4 server.
+	This has to be specifically enabled with the --leasequery option.
+	Many thanks to JAXPORT, Jacksonville Port Authority for sponsoring
+	this enhancement to dnsmasq.
+
+	Fix failure to cache PTR RRs when a reply contains more than one answer.
+	Thanks to Dmitry for spotting this.
+
+	Add TFTP options windowsize (RFC 7440) and timeout (RFC 2349).
+	
 	
 version 2.91
 	Fix spurious "resource limit exceeded messages". Thanks to 

contrib/leasequery/leasequery.c

@@ -0,0 +1,695 @@
+/* leasequery is Copyright (c) 2025 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/>.
+*/
+
+/* Author's email: simon@thekelleys.org.uk */
+
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <limits.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <errno.h>
+#include <pwd.h>
+#include <grp.h>
+#include <netdb.h>
+#include <linux/types.h>
+#include <linux/capability.h>
+#include <arpa/inet.h>
+#include <ctype.h>
+
+typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned int u32;
+typedef unsigned long long u64;
+
+#define INADDRSZ        4
+#define ADDRSTRLEN      46
+
+#define option_len(opt) ((int)(((unsigned char *)(opt))[1]))
+#define option_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2u+(unsigned int)(i)]))
+
+#define DHCP_CHADDR_MAX  16
+#define DHCP_SERVER_PORT 67
+#define DHCP_CLIENT_PORT 68
+#define BOOTREQUEST      1
+#define BOOTREPLY        2
+
+#define DHCP_COOKIE              0x63825363
+
+#define DHCPLEASEQUERY          10
+#define DHCPLEASEUNASSIGNED     11
+#define DHCPLEASEUNKNOWN        12
+#define DHCPLEASEACTIVE         13
+
+#define OPTION_END               255
+#define OPTION_ROUTER            3
+#define OPTION_VENDOR_CLASS_OPT  43
+#define OPTION_LEASE_TIME        51
+#define OPTION_MESSAGE_TYPE      53
+#define OPTION_SERVER_IDENTIFIER 54
+#define OPTION_REQUESTED_OPTIONS 55
+#define OPTION_VENDOR_ID         60
+#define OPTION_CLIENT_ID         61
+
+/* flags in top of length field for DHCP-option tables */
+#define OT_ADDR_LIST    0x8000
+#define OT_RFC1035_NAME 0x4000
+#define OT_INTERNAL     0x2000
+#define OT_NAME         0x1000
+#define OT_CSTRING      0x0800
+#define OT_DEC          0x0400 
+#define OT_TIME         0x0200
+
+#define GETSHORT(s, cp) do { \
+	unsigned char *t_cp = (unsigned char *)(cp); \
+	(s) = ((u16)t_cp[0] << 8) \
+	    | ((u16)t_cp[1]) \
+	    ; \
+	(cp) += 2; \
+  } while(0)
+
+#define GETLONG(l, cp) do { \
+	unsigned char *t_cp = (unsigned char *)(cp); \
+	(l) = ((u32)t_cp[0] << 24) \
+	    | ((u32)t_cp[1] << 16) \
+	    | ((u32)t_cp[2] << 8) \
+	    | ((u32)t_cp[3]) \
+	    ; \
+	(cp) += 4; \
+  } while (0)
+
+#define PUTSHORT(s, cp) do { \
+	u16 t_s = (u16)(s); \
+	unsigned char *t_cp = (unsigned char *)(cp); \
+	*t_cp++ = t_s >> 8; \
+	*t_cp   = t_s; \
+	(cp) += 2; \
+  } while(0)
+
+#define PUTLONG(l, cp) do { \
+	u32 t_l = (u32)(l); \
+	unsigned char *t_cp = (unsigned char *)(cp); \
+	*t_cp++ = t_l >> 24; \
+	*t_cp++ = t_l >> 16; \
+	*t_cp++ = t_l >> 8; \
+	*t_cp   = t_l; \
+	(cp) += 4; \
+  } while (0)
+
+union all_addr {
+  struct in_addr addr4;
+  struct in6_addr addr6;
+};
+  
+struct dhcp_packet_with_opts{
+  struct dhcp_packet {
+    unsigned char op, htype, hlen, hops;
+    unsigned int xid;
+    unsigned short secs, flags;
+    struct in_addr ciaddr, yiaddr, siaddr, giaddr;
+    unsigned char chaddr[DHCP_CHADDR_MAX], sname[64], file[128];
+  } header;
+  unsigned char options[312];
+};
+
+static const struct opttab_t {
+  char *name;
+  u16 val, size;
+} opttab[] = {
+  { "netmask", 1, OT_ADDR_LIST },
+  { "time-offset", 2, 4 },
+  { "router", 3, OT_ADDR_LIST  },
+  { "dns-server", 6, OT_ADDR_LIST },
+  { "log-server", 7, OT_ADDR_LIST },
+  { "lpr-server", 9, OT_ADDR_LIST },
+  { "hostname", 12, OT_INTERNAL | OT_NAME },
+  { "boot-file-size", 13, 2 | OT_DEC },
+  { "domain-name", 15, OT_NAME },
+  { "swap-server", 16, OT_ADDR_LIST },
+  { "root-path", 17, OT_NAME },
+  { "extension-path", 18, OT_NAME },
+  { "ip-forward-enable", 19, 1 },
+  { "non-local-source-routing", 20, 1 },
+  { "policy-filter", 21, OT_ADDR_LIST },
+  { "max-datagram-reassembly", 22, 2 | OT_DEC },
+  { "default-ttl", 23, 1 | OT_DEC },
+  { "mtu", 26, 2 | OT_DEC },
+  { "all-subnets-local", 27, 1 },
+  { "broadcast", 28, OT_INTERNAL | OT_ADDR_LIST },
+  { "router-discovery", 31, 1 },
+  { "router-solicitation", 32, OT_ADDR_LIST },
+  { "static-route", 33, OT_ADDR_LIST },
+  { "trailer-encapsulation", 34, 1 },
+  { "arp-timeout", 35, 4 | OT_DEC },
+  { "ethernet-encap", 36, 1 },
+  { "tcp-ttl", 37, 1 },
+  { "tcp-keepalive", 38, 4 | OT_DEC },
+  { "nis-domain", 40, OT_NAME },
+  { "nis-server", 41, OT_ADDR_LIST },
+  { "ntp-server", 42, OT_ADDR_LIST },
+  { "vendor-encap", 43, OT_INTERNAL },
+  { "netbios-ns", 44, OT_ADDR_LIST },
+  { "netbios-dd", 45, OT_ADDR_LIST },
+  { "netbios-nodetype", 46, 1 },
+  { "netbios-scope", 47, 0 },
+  { "x-windows-fs", 48, OT_ADDR_LIST },
+  { "x-windows-dm", 49, OT_ADDR_LIST },
+  { "requested-address", 50, OT_INTERNAL | OT_ADDR_LIST },
+  { "lease-time", 51, OT_INTERNAL | OT_TIME },
+  { "option-overload", 52, OT_INTERNAL },
+  { "message-type", 53, OT_INTERNAL | OT_DEC },
+  { "server-identifier", 54, OT_INTERNAL | OT_ADDR_LIST },
+  { "parameter-request", 55, OT_INTERNAL },
+  { "message", 56, OT_INTERNAL },
+  { "max-message-size", 57, OT_INTERNAL },
+  { "T1", 58, OT_TIME},
+  { "T2", 59, OT_TIME},
+  { "vendor-class", 60, OT_NAME },
+  { "client-id", 61, OT_INTERNAL },
+  { "nis+-domain", 64, OT_NAME },
+  { "nis+-server", 65, OT_ADDR_LIST },
+  { "tftp-server", 66, OT_NAME },
+  { "bootfile-name", 67, OT_NAME },
+  { "mobile-ip-home", 68, OT_ADDR_LIST }, 
+  { "smtp-server", 69, OT_ADDR_LIST }, 
+  { "pop3-server", 70, OT_ADDR_LIST }, 
+  { "nntp-server", 71, OT_ADDR_LIST }, 
+  { "irc-server", 74, OT_ADDR_LIST }, 
+  { "user-class", 77, 0 },
+  { "rapid-commit", 80, 0 },
+  { "FQDN", 81, OT_INTERNAL },
+  { "agent-info", 82, OT_INTERNAL },
+  { "last-transaction", 91, 4 | OT_TIME },
+  { "associated-ip", 92, OT_ADDR_LIST },
+  { "client-arch", 93, 2 | OT_DEC },
+  { "client-interface-id", 94, 0 },
+  { "client-machine-id", 97, 0 },
+  { "posix-timezone", 100, OT_NAME }, /* RFC 4833, Sec. 2 */
+  { "tzdb-timezone", 101, OT_NAME }, /* RFC 4833, Sec. 2 */
+  { "ipv6-only", 108, 4 | OT_DEC },  /* RFC 8925 */ 
+  { "subnet-select", 118, OT_INTERNAL },
+  { "domain-search", 119, OT_RFC1035_NAME },
+  { "sip-server", 120, 0 },
+  { "classless-static-route", 121, 0 },
+  { "vendor-id-encap", 125, 0 },
+  { "tftp-server-address", 150, OT_ADDR_LIST },
+  { "server-ip-address", 255, OT_ADDR_LIST }, /* special, internal only, sets siaddr */
+  { NULL, 0, 0 }
+};
+
+static void prettyprint_time(char *buf, unsigned int t);
+static char *print_mac(char *buff, unsigned char *mac, int len);
+
+int lookup_dhcp_opt(char *name)
+{
+  const struct opttab_t *t = opttab;
+  int i;
+
+  for (i = 0; t[i].name; i++)
+    if (strcasecmp(t[i].name, name) == 0)
+      return t[i].val;
+  
+  return -1;
+}
+
+char *option_string(unsigned int opt, unsigned char *val, int opt_len, char *buf, int buf_len)
+{
+  int o, i, j, nodecode = 0;
+  const struct opttab_t *ot = opttab;
+  char addrbuff[ADDRSTRLEN];
+  
+  for (o = 0; ot[o].name; o++)
+    if (ot[o].val == opt)
+      {
+	if (buf)
+	  {
+	    memset(buf, 0, buf_len);
+	    
+	    if (ot[o].size & OT_ADDR_LIST) 
+	      {
+		union all_addr addr;
+		int addr_len = INADDRSZ;
+
+		for (buf[0]= 0, i = 0; i <= opt_len - addr_len; i += addr_len) 
+		  {
+		    if (i != 0)
+		      strncat(buf, ", ", buf_len - strlen(buf));
+		    /* align */
+		    memcpy(&addr, &val[i], addr_len); 
+		    inet_ntop(AF_INET, &val[i], addrbuff, ADDRSTRLEN);
+		    strncat(buf, addrbuff, buf_len - strlen(buf));
+		  }
+	      }
+	    else if (ot[o].size & OT_NAME)
+		for (i = 0, j = 0; i < opt_len && j < buf_len ; i++)
+		  {
+		    char c = val[i];
+		    if (isprint((unsigned char)c))
+		      buf[j++] = c;
+		  }
+	    else if ((ot[o].size & (OT_DEC | OT_TIME)) && opt_len != 0)
+	      {
+		unsigned int dec = 0;
+		
+		for (i = 0; i < opt_len; i++)
+		  dec = (dec << 8) | val[i]; 
+
+		if (ot[o].size & OT_TIME)
+		  prettyprint_time(buf, dec);
+		else
+		  sprintf(buf, "%u", dec);
+	      }
+	    else
+	      nodecode = 1;
+	  }
+	break;
+      }
+
+  if (opt_len != 0 && buf && (!ot[o].name || nodecode))
+    {
+      int trunc  = 0;
+      if (opt_len > 14)
+	{
+	  trunc = 1;
+	  opt_len = 14;
+	}
+      print_mac(buf, val, opt_len);
+      if (trunc)
+	strncat(buf, "...", buf_len - strlen(buf));
+    
+
+    }
+
+  return ot[o].name ? ot[o].name : "";
+
+}
+
+static void prettyprint_time(char *buf, unsigned int t)
+{
+  if (t == 0xffffffff)
+    sprintf(buf, "infinite");
+  else
+    {
+      unsigned int x, p = 0;
+       if ((x = t/86400))
+	p += sprintf(&buf[p], "%ud", x);
+       if ((x = (t/3600)%24))
+	p += sprintf(&buf[p], "%uh", x);
+      if ((x = (t/60)%60))
+	p += sprintf(&buf[p], "%um", x);
+      if ((x = t%60))
+	sprintf(&buf[p], "%us", x);
+    }
+}
+
+static char *print_mac(char *buff, unsigned char *mac, int len)
+{
+  char *p = buff;
+  int i;
+   
+  if (len == 0)
+    sprintf(p, "<null>");
+  else
+    for (i = 0; i < len; i++)
+      p += sprintf(p, "%.2x%s", mac[i], (i == len - 1) ? "" : ":");
+  
+  return buff;
+}
+
+static unsigned char *dhcp_skip_opts(struct dhcp_packet_with_opts *pktp)
+{
+  unsigned char *start = (unsigned char *)(((unsigned int *)&pktp->options[0]) + 1);
+  while (*start != 0)
+    start += start[1] + 2;
+  return start;
+}
+
+static unsigned char *dhcp_find_opt(struct dhcp_packet_with_opts *pktp, int optno)
+{
+  unsigned char *start = (unsigned char *)(((unsigned int *)&pktp->options[0]) + 1);
+  while (*start != OPTION_END)
+    {
+      if (*start == optno)
+	return start;
+      start += start[1] + 2;
+    }
+
+  return NULL;
+}
+
+static void option_put(struct dhcp_packet_with_opts *pktp, int opt, int len, unsigned int val)
+{
+  int i;
+  unsigned char *p = dhcp_skip_opts(pktp);
+  
+  if (p) 
+    {
+      *p++ = opt;
+      *p++ = len;
+      for (i = 0; i < len; i++)
+      *(p++) = val >> (8 * (len - (i + 1)));
+    }
+}
+
+static void option_put_string(struct dhcp_packet_with_opts *pktp, int opt, 
+			      const char *string, int null_term)
+{
+  unsigned char *p;
+  size_t len = strlen(string);
+
+  if (null_term && len != 255)
+    len++;
+
+  if ((p = dhcp_skip_opts(pktp)))
+    {
+      *p++ = opt;
+      *p++ = len;
+      memcpy(p, string, len);
+    }
+}
+
+
+/* in may equal out, when maxlen may be -1 (No max len). 
+   Return -1 for extraneous no-hex chars found. */
+int parse_hex(char *in, unsigned char *out, int maxlen, 
+	      unsigned int *wildcard_mask, int *mac_type)
+{
+  int done = 0, mask = 0, i = 0;
+  char *r;
+    
+  if (mac_type)
+    *mac_type = 0;
+  
+  while (!done && (maxlen == -1 || i < maxlen))
+    {
+      for (r = in; *r != 0 && *r != ':' && *r != '-' && *r != ' '; r++)
+	if (*r != '*' && !isxdigit((unsigned char)*r))
+	  return -1;
+      
+      if (*r == 0)
+	done = 1;
+      
+      if (r != in )
+	{
+	  if (*r == '-' && i == 0 && mac_type)
+	   {
+	      *r = 0;
+	      *mac_type = strtol(in, NULL, 16);
+	      mac_type = NULL;
+	   }
+	  else
+	    {
+	      *r = 0;
+	      if (strcmp(in, "*") == 0)
+		{
+		  mask = (mask << 1) | 1;
+		  i++;
+		}
+	      else
+		{
+		  int j, bytes = (1 + (r - in))/2;
+		  for (j = 0; j < bytes; j++)
+		    { 
+		      char sav;
+		      if (j < bytes - 1)
+			{
+			  sav = in[(j+1)*2];
+			  in[(j+1)*2] = 0;
+			}
+		      /* checks above allow mix of hexdigit and *, which
+			 is illegal. */
+		      if (strchr(&in[j*2], '*'))
+			return -1;
+		      out[i] = strtol(&in[j*2], NULL, 16);
+		      mask = mask << 1;
+		      if (++i == maxlen)
+			break; 
+		      if (j < bytes - 1)
+			in[(j+1)*2] = sav;
+		    }
+		}
+	    }
+	}
+      in = r+1;
+    }
+  
+  if (wildcard_mask)
+    *wildcard_mask = mask;
+
+  return i;
+}
+
+static char *split_chr(char *s, char c)
+{
+  char *comma, *p;
+
+  if (!s || !(comma = strchr(s, c)))
+    return NULL;
+  
+  p = comma;
+  *comma = ' ';
+  
+  for (; *comma == ' '; comma++);
+  
+  for (; (p >= s) && *p == ' '; p--)
+    *p = 0;
+  
+  return comma;
+}
+
+static char *split(char *s)
+{
+  return split_chr(s, ',');
+}
+
+
+int main(int argc, char **argv)
+{
+  int fd;
+  struct ifreq ifr;
+  struct in_addr iface_addr, server_addr, lease_addr;
+  struct dhcp_packet_with_opts pkt;
+  struct sockaddr_in saddr;
+  unsigned char *p;
+  ssize_t sz;
+  unsigned char mac[DHCP_CHADDR_MAX], clid[256], req_options[256];
+  char buff[500];
+  int clid_len = 0, mac_len = 0, mac_type = 0, opts_len = 0;
+  unsigned short port = DHCP_SERVER_PORT;
+  unsigned int xid;
+  struct timeval tv;
+  
+  gettimeofday(&tv, NULL);
+  srand(tv.tv_usec);
+  xid = rand();
+  server_addr.s_addr = lease_addr.s_addr = iface_addr.s_addr = 0;
+  
+  if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
+    {
+      perror("leasequery: cannot create socket");
+      exit(1);
+    }
+  
+  while (1)
+    {
+      int option = getopt(argc, argv, "i:s:l:m:c:p:r:");
+
+      if (option == -1)
+	break;
+      
+      switch (option) 
+	{
+	default:
+	  fprintf(stderr,
+		  "-p <port>             port on DHCP server.\n"
+		  "-i <interface>        exit interface to DHCP server.\n"
+		  "-s <inet-addr>        DHCP server address.\n"
+		  "-l <inet-addr>        Query lease by IP address.\n"
+		  "-m <MAC-addr>         Query lease by MAC address.\n"
+		  "-c <hex>              Query lease by client-id.\n"
+		  "-r <name>|<int>[,...] List of options to return.\n");
+	  exit(1);
+		  		  
+	case 'p':
+	  port = atoi(optarg);
+	  break;
+	  
+	case 'i':
+	  strncpy(ifr.ifr_name, optarg, IF_NAMESIZE);
+	   ifr.ifr_addr.sa_family = AF_INET;
+	   if (ioctl(fd, SIOCGIFADDR, &ifr) == -1)
+	    {
+	      perror("leasequery: cannot get interface address");
+	      exit(1);
+	    }
+
+	  iface_addr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr;
+	  break;
+
+	case 's':
+	  if (inet_pton(AF_INET, optarg, &server_addr) <= 0)
+	    {
+	      fprintf(stderr, "leasequery: bad server address\n");
+	      exit(1);
+	    }
+	  break;
+
+	case 'l':
+	  if (inet_pton(AF_INET, optarg, &lease_addr) <= 0)
+	    {
+	      fprintf(stderr, "leasequery: bad lease address\n");
+	      exit(1);
+	    }
+	  break;
+
+	case 'm':
+	  mac_type = 1; /* default ethernet */
+	  mac_len = parse_hex(optarg, mac, DHCP_CHADDR_MAX, NULL, &mac_type);
+	  if (!mac_type)
+	    mac_type  = 1; /* default ethernet */
+	  break;
+
+	case 'c':
+	  clid_len = parse_hex(optarg, clid, 256, NULL, NULL);
+	  break;
+
+	case 'r':
+	  {
+	    char *comma;
+	    int opt;
+	    
+	    while (optarg)
+	      {
+		comma = split(optarg);
+		
+		if ((opt = lookup_dhcp_opt(optarg)) != -1 || (opt = atoi(optarg)) != 0) 
+		  req_options[opts_len++] = opt;
+		
+		optarg = comma;
+	      }
+	    
+	    break;
+	  }
+	}
+    }
+
+  if (!server_addr.s_addr)
+    {
+      fprintf(stderr, "leasequery: no server address\n");
+      exit(1);
+    }
+    
+  memset(&pkt, 0, sizeof pkt);
+  pkt.header.op = BOOTREQUEST;
+  pkt.header.xid = xid;
+  pkt.header.ciaddr = lease_addr;
+  pkt.header.hlen = mac_len;
+  pkt.header.htype = mac_type;
+  memcpy(pkt.header.chaddr, mac, mac_len);
+  *((unsigned int *)&pkt.options[0]) = htonl(DHCP_COOKIE);
+
+  /* Dnsmasq extension. */
+  pkt.header.giaddr.s_addr = iface_addr.s_addr ? iface_addr.s_addr : INADDR_BROADCAST;
+    
+  option_put(&pkt, OPTION_MESSAGE_TYPE, 1, DHCPLEASEQUERY);
+  
+  if (clid_len != 0)
+    {
+      p = dhcp_skip_opts(&pkt);
+      *p++ = OPTION_CLIENT_ID;
+      *p++ = clid_len;
+      memcpy(p, clid, clid_len);
+    }
+  
+  if (opts_len != 0)
+    {
+      p = dhcp_skip_opts(&pkt); 
+      *p++ = OPTION_REQUESTED_OPTIONS;
+      *p++ = opts_len;
+      memcpy(p, req_options, opts_len);
+    }
+  
+  if (iface_addr.s_addr)
+    {
+      saddr.sin_family = AF_INET;
+      saddr.sin_port = htons(port);
+      saddr.sin_addr.s_addr = iface_addr.s_addr;
+      
+      if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in)))
+	{
+	  perror("leasequery: cannot bind DHCP server socket");
+	  exit(1);
+	}
+    }
+	  
+  saddr.sin_family = AF_INET;
+  saddr.sin_port = htons(port);
+  saddr.sin_addr = server_addr;
+
+  while((sz = sendto(fd, &pkt, dhcp_skip_opts(&pkt) - ((unsigned char *)&pkt), 0, (struct sockaddr *)&saddr, sizeof(saddr))) == -1 &&
+	errno == EINTR);
+
+  if (sz == -1)
+    {
+      perror("leasequery: sendto()");
+      exit(1);
+    }
+  
+  sz = recv(fd, &pkt, sizeof(pkt), 0);
+
+  if (sz == -1)
+    {
+      perror("leasequery: recv()");
+      exit(1);
+    }
+  
+  if (sz >= sizeof(pkt.header) &&
+      pkt.header.op == BOOTREPLY &&
+      (p = dhcp_find_opt(&pkt, OPTION_MESSAGE_TYPE)) &&
+      pkt.header.xid == xid)
+    {
+      if (p[2] == DHCPLEASEUNASSIGNED)
+	printf("UNASSIGNED\n");
+      else if (p[2] == DHCPLEASEUNKNOWN)
+	printf("UNKNOWN\n");
+      else if (p[2] == DHCPLEASEACTIVE)
+	{
+	  print_mac(buff, pkt.header.chaddr, pkt.header.hlen);
+	  printf("ACTIVE %s %s\n", inet_ntoa(pkt.header.ciaddr), buff);
+      
+	  p = (unsigned char *)(((unsigned int *)&pkt.options[0]) + 1);
+	  
+	  while (*p != OPTION_END)
+	    {
+	      if (*p != OPTION_MESSAGE_TYPE)
+		{
+		  char *optname = option_string(p[0], option_ptr(p, 0), option_len(p), buff, 500);
+		  
+		  printf("size:%3d option:%3d %s  %s\n", option_len(p), p[0], optname, buff);
+		}
+	      p += p[1] + 2;
+	    }
+	}
+    }
+}

man/dnsmasq.8

@@ -1438,6 +1438,18 @@ 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 --leasequery[=<addr>[/<prefix>]]
+Enable RFC 4388 leasequery. The dnsmasq DHCP server will answer LEASEQUERY messages from DHCP relays
+when this option is given. If an address or subnet is given, only queries from a relay at that source are allowed. Repeat
+the --leasequery option to specify multiple allowed sources.
+To correctly answer lease queries it is necessary to store extra data in
+the lease database, and this is also enabled by the \fB--leasequery\fP option. The extra fields
+(agent-info and vendorclass) are stored in the leases file in a somewhat backwards compatible manner.
+Enabling and then disabling leasequery will not cause problems; the extra information will be aged
+out of the database. However, enabling leasequery in release 2.92 or later, storing leases
+which come via DHCP relays which add option-82 agent-info data, and then moving back to a pre-2.92 dnsmasq
+binary may cause problems reading the leases file. As of release 2.92, leasequery is only supported for DHCPv4.
+.TP
 .B --dhcp-relay=<local address>[,<server address>[#<server port>]][,<interface]
 Configure dnsmasq to do DHCP relay. The local address is an address
 allocated to an interface on the host running dnsmasq. All DHCP

src/cache.c

@@ -102,6 +102,8 @@ static const struct {
   { 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*/
   { 66,  "DSYNC" }, /* Endpoint discovery for delegation synchronization [draft-ietf-dnsop-generalized-notify-03] DSYNC/dsync-completed-template 2024-12-10 */
+  { 67,  "HHIT" }, /* [draft-ietf-drip-registries-28] */
+  { 68,  "BRID" }, /* [draft-ietf-drip-registries-28] */
   { 99,  "SPF" }, /* [RFC7208] */
   { 100, "UINFO" }, /* [IANA-Reserved] */
   { 101, "UID" }, /* [IANA-Reserved] */

src/config.h

@@ -52,6 +52,8 @@
 #define CHUSER "nobody"
 #define CHGRP "dip"
 #define TFTP_MAX_CONNECTIONS 50 /* max simultaneous connections */
+#define TFTP_MAX_WINDOW 32 /* max window size to negotiate */
+#define TFTP_TRANSFER_TIME 120 /* Abandon TFTP transfers after this long. Two mins. */
 #define LOG_MAX 5 /* log-queue length */
 #define RANDFILE "/dev/urandom"
 #define DNSMASQ_SERVICE "uk.org.thekelleys.dnsmasq" /* Default - may be overridden by config */

src/dhcp-common.c

@@ -701,7 +701,9 @@ static const struct opttab_t {
   { "user-class", 77, 0 },
   { "rapid-commit", 80, 0 },
   { "FQDN", 81, OT_INTERNAL },
-  { "agent-id", 82, OT_INTERNAL },
+  { "agent-info", 82, OT_INTERNAL },
+  { "last-transaction", 91, 4 | OT_TIME },
+  { "associated-ip", 92, OT_ADDR_LIST },
   { "client-arch", 93, 2 | OT_DEC },
   { "client-interface-id", 94, 0 },
   { "client-machine-id", 97, 0 },

src/dhcp-protocol.h

@@ -57,6 +57,8 @@
 #define OPTION_RAPID_COMMIT      80
 #define OPTION_CLIENT_FQDN       81
 #define OPTION_AGENT_ID          82
+#define OPTION_LAST_TRANSACTION  91
+#define OPTION_ASSOCIATED_IP     92
 #define OPTION_ARCH              93
 #define OPTION_PXE_UUID          97
 #define OPTION_SUBNET_SELECT     118
@@ -87,6 +89,11 @@
 #define DHCPNAK                  6
 #define DHCPRELEASE              7
 #define DHCPINFORM               8
+#define DHCPFORCERENEW           9
+#define DHCPLEASEQUERY          10
+#define DHCPLEASEUNASSIGNED     11
+#define DHCPLEASEUNKNOWN        12
+#define DHCPLEASEACTIVE         13
 
 #define BRDBAND_FORUM_IANA       3561 /* Broadband forum IANA enterprise */
 

src/dhcp.c

@@ -135,7 +135,7 @@ void dhcp_packet(time_t now, int pxe_fd)
   struct dhcp_packet *mess;
   struct dhcp_context *context;
   struct dhcp_relay *relay;
-  int is_relay_reply = 0;
+  int is_relay_reply = 0, is_relay_use_source = 0;
   struct iname *tmp;
   struct ifreq ifr;
   struct msghdr msg;
@@ -230,6 +230,20 @@ void dhcp_packet(time_t now, int pxe_fd)
     return;
   
   mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base;
+  
+  /* Non-standard extension:
+     If giaddr == 255.255.255.255 we reply to the source
+     address in the request packet header. This makes
+     stand-alone leasequery clients easier, as they
+     can leave source address determination to the kernel.
+     In this case, set a flag and clear giaddr here,
+     to avoid massive relay confusion. */
+  if (mess->giaddr.s_addr == INADDR_BROADCAST)
+    {
+      mess->giaddr.s_addr = 0;
+      is_relay_use_source = 1;
+    }
+  
   loopback = !mess->giaddr.s_addr && (ifr.ifr_flags & IFF_LOOPBACK);
   
 #ifdef HAVE_LINUX_NETWORK
@@ -337,8 +351,9 @@ void dhcp_packet(time_t now, int pxe_fd)
 	return;
 
       lease_prune(NULL, now); /* lose any expired leases */
-      iov.iov_len = dhcp_reply(parm.current, ifr.ifr_name, iface_index, (size_t)sz, 
-			       now, unicast_dest, loopback, &is_inform, pxe_fd, iface_addr, recvtime);
+      iov.iov_len = dhcp_reply(parm.current, ifr.ifr_name, iface_index, (size_t)sz, now, unicast_dest,
+			       loopback, &is_inform, pxe_fd, iface_addr, recvtime,
+			       is_relay_use_source ? dest.sin_addr : mess->giaddr);
       lease_update_file(now);
       lease_update_dns(0);
       
@@ -365,11 +380,17 @@ void dhcp_packet(time_t now, int pxe_fd)
       if (mess->ciaddr.s_addr != 0)
 	dest.sin_addr = mess->ciaddr;
     }
-  else if (mess->giaddr.s_addr && !is_relay_reply)
+  if ((is_relay_use_source || mess->giaddr.s_addr) && !is_relay_reply)
     {
-      /* Send to BOOTP relay  */
-      dest.sin_port = htons(daemon->dhcp_server_port);
-      dest.sin_addr = mess->giaddr; 
+      /* Send to BOOTP relay. */
+      if (is_relay_use_source)
+	/* restore as-received value */
+	mess->giaddr.s_addr = INADDR_BROADCAST;
+      else
+	{
+	  dest.sin_addr = mess->giaddr;
+	  dest.sin_port = htons(daemon->dhcp_server_port);
+	}
     }
   else if (mess->ciaddr.s_addr)
     {

src/dnsmasq.c

@@ -30,7 +30,9 @@ static volatile pid_t pid = 0;
 static volatile int pipewrite;
 
 static void set_dns_listeners(void);
+#ifdef HAVE_TFTP
 static void set_tftp_listeners(void);
+#endif
 static void check_dns_listeners(time_t now);
 static void do_tcp_connection(struct listener *listener, time_t now, int slot);
 static void sig_handler(int sig);
@@ -62,14 +64,16 @@ int main (int argc, char **argv)
   int need_cap_net_raw = 0;
   int need_cap_net_bind_service = 0;
   int have_cap_chown = 0;
+#  ifdef HAVE_DHCP
   char *bound_device = NULL;
   int did_bind = 0;
+#  endif
   struct server *serv;
   char *netlink_warn;
 #else
   int bind_fallback = 0;
 #endif 
-#if defined(HAVE_DHCP) || defined(HAVE_DHCP6)
+#if defined(HAVE_DHCP)
   struct dhcp_context *context;
   struct dhcp_relay *relay;
 #endif
@@ -77,6 +81,10 @@ int main (int argc, char **argv)
   int tftp_prefix_missing = 0;
 #endif
 
+#ifdef HAVE_LINUX_NETWORK
+  (void)netlink_warn;
+#endif
+  
 #if defined(HAVE_IDN) || defined(HAVE_LIBIDN2) || defined(LOCALEDIR)
   setlocale(LC_ALL, "");
 #endif
@@ -1939,11 +1947,14 @@ static void do_tcp_connection(struct listener *listener, time_t now, int slot)
   pid_t p;
   union mysockaddr tcp_addr;
   socklen_t tcp_len = sizeof(union mysockaddr);
-  unsigned char a = 0, *buff;
+  unsigned char *buff;
   struct server *s; 
   int flags, auth_dns;
   struct in_addr netmask;
   int pipefd[2];
+#ifdef HAVE_LINUX_NETWORK
+  unsigned char a = 0;
+#endif
 
   while ((confd = accept(listener->tcpfd, NULL, NULL)) == -1 && errno == EINTR);
   
@@ -2052,7 +2063,7 @@ static void do_tcp_connection(struct listener *listener, time_t now, int slot)
 	     single byte comes back up the pipe, which
 	     is sent by the child after it has closed the
 	     netlink socket. */
-	  
+
 	  read_write(pipefd[0], &a, 1, RW_READ);
 #endif
 	  

src/dnsmasq.h

@@ -48,6 +48,12 @@
 #define ATTRIBUTE_NORETURN
 #endif
 
+#if __GNUC__ + 0 >= 8 // clang 20.1.0 does not yet support this
+#define ATTRIBUTE_NONSTRING __attribute__ ((nonstring))
+#else
+#define ATTRIBUTE_NONSTRING
+#endif
+
 /* get these before config.h  for IPv6 stuff... */
 #include <sys/types.h> 
 #include <sys/socket.h>
@@ -282,7 +288,8 @@ struct event_desc {
 #define OPT_NO_0x20        74
 #define OPT_DO_0x20        75
 #define OPT_AUTH_LOG       76
-#define OPT_LAST           77
+#define OPT_LEASEQUERY     77
+#define OPT_LAST           78
 
 #define OPTION_BITS (sizeof(unsigned int)*8)
 #define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )
@@ -864,6 +871,8 @@ struct dhcp_lease {
   int last_interface;
   int new_interface;     /* save possible originated interface */
   int new_prefixlen;     /* and its prefix length */
+  unsigned char *agent_id, *vendorclass;
+  int agent_id_len, vendorclass_len;
 #ifdef HAVE_DHCP6
   struct in6_addr addr6;
   unsigned int iaid;
@@ -1108,14 +1117,13 @@ struct tftp_file {
 
 struct tftp_transfer {
   int sockfd;
-  time_t timeout;
-  int backoff;
-  unsigned int block, blocksize, expansion;
+  time_t retransmit, start;
+  unsigned int lastack, block, blocksize, windowsize, timeout, expansion;
   off_t offset;
   union mysockaddr peer;
   union all_addr source;
   int if_index;
-  char opt_blocksize, opt_transize, netascii, carrylf;
+  unsigned char opt_blocksize, opt_transize, opt_windowsize, opt_timeout, netascii, carrylf, backoff;
   struct tftp_file *file;
   struct tftp_transfer *next;
 };
@@ -1183,7 +1191,7 @@ extern struct daemon {
   char *runfile; 
   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 bogus_addr *bogus_addr, *ignore_addr, *leasequery_addr;
   struct server *servers, *servers_tail, *local_domains, **serverarray;
   struct rebind_domain *no_rebind;
   int server_has_wildcard;
@@ -1410,7 +1418,7 @@ unsigned int extract_request(struct dns_header *header, size_t qlen, char *name,
 			     unsigned short *typep, unsigned short *classp);
 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, struct ipsets *ipsets, struct ipsets *nftsets, int is_sign,
+		      time_t now, struct ipsets *ipsets, struct ipsets *nftsets,
                       int check_rebind, int no_cache_dnssec, int secure);
 #if defined(HAVE_CONNTRACK) && defined(HAVE_UBUS)
 void report_addresses(struct dns_header *header, size_t len, u32 mark);
@@ -1619,6 +1627,7 @@ void lease6_reset(void);
 struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type,
 					 unsigned char *clid, int clid_len, unsigned int iaid);
 struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr);
+struct dhcp_lease *lease6_find_by_plain_addr(struct in6_addr *addr);
 u64 lease_find_max_addr6(struct dhcp_context *context);
 void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface);
 void lease_update_slaac(time_t now);
@@ -1631,6 +1640,8 @@ void lease_set_hwaddr(struct dhcp_lease *lease, const unsigned char *hwaddr,
 void lease_set_hostname(struct dhcp_lease *lease, const char *name, int auth, char *domain, char *config_domain);
 void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now);
 void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now);
+void lease_set_agent_id(struct dhcp_lease *lease, unsigned char *new, int len);
+void lease_set_vendorclass(struct dhcp_lease *lease, unsigned char *new, int len);
 struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type,  
 					unsigned char *clid, int clid_len);
 struct dhcp_lease *lease_find_by_addr(struct in_addr addr);
@@ -1651,7 +1662,8 @@ void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data,
 #ifdef HAVE_DHCP
 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 		  size_t sz, time_t now, int unicast_dest, int loopback,
-		  int *is_inform, int pxe, struct in_addr fallback, time_t recvtime);
+		  int *is_inform, int pxe, struct in_addr fallback,
+		  time_t recvtime, struct in_addr leasequery_source);
 unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, 
 			       int clid_len, unsigned char *clid, int *len_out);
 #endif
@@ -1755,7 +1767,6 @@ void queue_relay_snoop(struct in6_addr *client, int if_index, struct in6_addr *p
 
 /* tftp.c */
 #ifdef HAVE_TFTP
-void tftp_request(struct listener *listen, time_t now);
 void check_tftp_listeners(time_t now);
 int do_tftp_script_run(void);
 #endif

src/domain-match.c

@@ -343,10 +343,8 @@ int filter_servers(int seed, int flags, int *lowout, int *highout)
 		      else
 			{
 			  /* If we want a server for a particular domain, and this one isn't, return nothing. */
-			  if ((flags & F_DOMAINSRV) && daemon->serverarray[nlow]->domain_len == 0)
+			  if (nlow != nhigh && (flags & F_DOMAINSRV) && daemon->serverarray[nlow]->domain_len == 0)
 			    nlow = nhigh;
-			  else
-			    nlow = i;
 			}
 		    }
 		}

src/edns0.c

@@ -494,7 +494,7 @@ int check_source(struct dns_header *header, size_t plen, unsigned char *pseudohe
 #define UMBRELLA_DEVICESZ   sizeof(daemon->umbrella_device)
 
 struct umbrella_opt {
-  u8 magic[4];
+  u8 magic[4] ATTRIBUTE_NONSTRING;
   u8 version;
   u8 flags;
   /* We have 4 possible fields since we'll never send both IPv4 and

src/forward.c

@@ -670,6 +670,7 @@ int fast_retry(time_t now)
   return ret;
 }
 
+#if defined(HAVE_IPSET) || defined(HAVE_NFTSET)
 static struct ipsets *domain_find_sets(struct ipsets *setlist, const char *domain) {
   /* Similar algorithm to search_servers. */
   struct ipsets *ipset_pos, *ret = NULL;
@@ -690,6 +691,7 @@ static struct ipsets *domain_find_sets(struct ipsets *setlist, const char *domai
 
   return ret;
 }
+#endif
 
 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, 
@@ -819,7 +821,7 @@ static size_t process_reply(struct dns_header *header, time_t now, struct server
 	}
       else
 	{
-	  int rc = extract_addresses(header, n, daemon->namebuff, now, ipsets, nftsets, is_sign, check_rebind, no_cache, cache_secure);
+	  int rc = extract_addresses(header, n, daemon->namebuff, now, ipsets, nftsets, check_rebind, no_cache, cache_secure);
 
 	  if (rc != 0)
 	    {

src/inotify.c

@@ -133,29 +133,44 @@ void inotify_dnsmasq_init()
     }
 }
 
-static struct hostsfile *dyndir_addhosts(struct dyndir *dd, char *path)
+static struct hostsfile *dyndir_addhosts(struct dyndir *dd, char *file)
 {
   /* Check if this file is already known in dd->files */
-  struct hostsfile *ah = NULL;
-  for(ah = dd->files; ah; ah = ah->next)
-    if(ah && ah->fname && strcmp(path, ah->fname) == 0)
+  struct hostsfile *ah;
+  size_t dirlen = strlen(dd->dname);
+  
+  /* ah->fname always starts with the string in dd->dname */
+  for (ah = dd->files; ah; ah = ah->next)
+    if (ah->fname[dirlen] == '/' &&
+        strcmp(&ah->fname[dirlen+1], file) == 0)
       return ah;
-
+        
   /* Not known, create new hostsfile record for this dyndir */
-  struct hostsfile *newah = NULL;
-  if(!(newah = whine_malloc(sizeof(struct hostsfile))))
-    return NULL;
+  if ((ah = whine_malloc(sizeof(struct hostsfile))))
+    {
+      char *path;
 
-  /* Add this file to the tip of the linked list */
-  newah->next = dd->files;
-  dd->files = newah;
-
-  /* Copy flags, set index and the full file path */
-  newah->flags = dd->flags;
-  newah->index = daemon->host_index++;
-  newah->fname = path;
-
-  return newah;
+      if (!(path = whine_malloc(dirlen + strlen(file) + 2)))
+	{
+	  free(ah);
+	  return NULL;
+	}
+      
+      strcpy(path, dd->dname);
+      strcat(path, "/");
+      strcat(path, file);
+      
+      /* Add this file to the tip of the linked list */
+      ah->next = dd->files;
+      dd->files = ah;
+      
+      /* Copy flags, set index and the full file path */
+      ah->flags = dd->flags;
+      ah->index = daemon->host_index++;
+      ah->fname = path;
+    }
+  
+  return ah;
 }
 
 
@@ -204,10 +219,8 @@ void set_dynamic_inotify(int flag, int total_size, struct crec **rhash, int revh
 
        while ((ent = readdir(dir_stream)))
 	 {
-	   size_t lendir = strlen(dd->dname);
 	   size_t lenfile = strlen(ent->d_name);
-	   char *path;
-
+	   	   
 	   /* ignore emacs backups and dotfiles */
 	   if (lenfile == 0 || 
 	       ent->d_name[lenfile - 1] == '~' ||
@@ -215,33 +228,36 @@ void set_dynamic_inotify(int flag, int total_size, struct crec **rhash, int revh
 	       ent->d_name[0] == '.')
 	     continue;
 
-	   if ((path = whine_malloc(lendir + lenfile + 2)))
+	   if (dd->flags & AH_HOSTS)
 	     {
 	       struct hostsfile *ah;
 
-	       strcpy(path, dd->dname);
-	       strcat(path, "/");
-	       strcat(path, ent->d_name);
-
-	       if (!(ah = dyndir_addhosts(dd, path)))
-		 {
-		   free(path);
-		   continue;
-		 }
-	       
 	       /* ignore non-regular files */
-	       if (stat(path, &buf) != -1 && S_ISREG(buf.st_mode))
-		 {
-		   if (dd->flags & AH_HOSTS)
-		     total_size = read_hostsfile(path, ah->index, total_size, rhash, revhashsz);
+	       if ((ah = dyndir_addhosts(dd, ent->d_name)) &&
+		   stat(ah->fname, &buf) != -1 && S_ISREG(buf.st_mode))
+		 total_size = read_hostsfile(ah->fname, ah->index, total_size, rhash, revhashsz);
+	     }
 #ifdef HAVE_DHCP
-		   else if (dd->flags & (AH_DHCP_HST | AH_DHCP_OPT))
+	   else if (dd->flags & (AH_DHCP_HST | AH_DHCP_OPT))
+	     {
+	       char *path;
+	       
+	       if ((path = whine_malloc(strlen(dd->dname) + lenfile + 2)))
+		 {
+		   strcpy(path, dd->dname);
+		   strcat(path, "/");
+		   strcat(path, ent->d_name);
+		   
+		   /* ignore non-regular files */
+		   if (stat(path, &buf) != -1 && S_ISREG(buf.st_mode))
 		     option_read_dynfile(path, dd->flags);
-#endif		   
+		   
+		   free(path);
 		 }
 	     }
+#endif		   
 	 }
-
+       
        closedir(dir_stream);
     }
 }
@@ -251,6 +267,8 @@ int inotify_check(time_t now)
   int hit = 0;
   struct dyndir *dd;
 
+  (void)now;
+  
   while (1)
     {
       int rc;
@@ -283,50 +301,27 @@ int inotify_check(time_t now)
 	  for (dd = daemon->dynamic_dirs; dd; dd = dd->next)
 	    if (dd->wd == in->wd)
 	      {
-		size_t lendir = strlen(dd->dname);
-		char *path;
-				
-		if ((path = whine_malloc(lendir + in->len + 2)))
+		if (dd->flags & AH_HOSTS)
 		  {
-		    struct hostsfile *ah = NULL;
-
-		    strcpy(path, dd->dname);
-		    strcat(path, "/");
-		    strcat(path, in->name);
-
-		    /* Is this is a deletion event? */
-		    if (in->mask & IN_DELETE)
-		      my_syslog(LOG_INFO, _("inotify: %s removed"), path);
-		    else 
-		      my_syslog(LOG_INFO, _("inotify: %s new or modified"), path);
-
-		    if (dd->flags & AH_HOSTS)
+		    struct hostsfile *ah;
+		    if ((ah = dyndir_addhosts(dd, in->name)))
 		      {
-			if ((ah = dyndir_addhosts(dd, path)))
-			  {
-			    const unsigned int removed = cache_remove_uid(ah->index);
-			    if (removed > 0)
-			      my_syslog(LOG_INFO, _("inotify: flushed %u names read from %s"), removed, path);
+			const unsigned int removed = cache_remove_uid(ah->index);
 
-			    /* (Re-)load hostsfile only if this event isn't triggered by deletion */
-			    if (!(in->mask & IN_DELETE))
-			      read_hostsfile(path, ah->index, 0, NULL, 0);
+			/* Is this is a deletion event? */
+			if (in->mask & IN_DELETE)
+			  my_syslog(LOG_INFO, _("inotify: %s removed"), ah->fname);
+			else 
+			  my_syslog(LOG_INFO, _("inotify: %s new or modified"), ah->fname);
+
+			if (removed > 0)
+			  my_syslog(LOG_INFO, _("inotify: flushed %u names read from %s"), removed, ah->fname);
+			
+			/* (Re-)load hostsfile only if this event isn't triggered by deletion */
+			if (!(in->mask & IN_DELETE))
+			  read_hostsfile(ah->fname, ah->index, 0, NULL, 0);
 #ifdef HAVE_DHCP
-			    if (daemon->dhcp || daemon->doing_dhcp6) 
-			      {
-				/* Propagate the consequences of loading a new dhcp-host */
-				dhcp_update_configs(daemon->dhcp_conf);
-				lease_update_from_configs(); 
-				lease_update_file(now); 
-				lease_update_dns(1);
-			      }
-#endif
-			  }
-		      }
-#ifdef HAVE_DHCP
-		    else if (dd->flags & AH_DHCP_HST)
-		      {
-			if (option_read_dynfile(path, AH_DHCP_HST))
+			if (daemon->dhcp || daemon->doing_dhcp6) 
 			  {
 			    /* Propagate the consequences of loading a new dhcp-host */
 			    dhcp_update_configs(daemon->dhcp_conf);
@@ -334,17 +329,43 @@ int inotify_check(time_t now)
 			    lease_update_file(now); 
 			    lease_update_dns(1);
 			  }
-		      }
-		    else if (dd->flags & AH_DHCP_OPT)
-		      option_read_dynfile(path, AH_DHCP_OPT);
 #endif
-		    
-		    if (!ah)
-		      free(path);
+		      }
 		  }
+#ifdef HAVE_DHCP
+		else if (!(in->mask & IN_DELETE))
+		  {
+		    char *path;
+
+		    if ((path = whine_malloc(strlen(dd->dname) + in->len + 2)))
+		      {
+			strcpy(path, dd->dname);
+			strcat(path, "/");
+			strcat(path, in->name);
+			
+			my_syslog(LOG_INFO, _("inotify: %s new or modified"), path);
+
+			if ((dd->flags & AH_DHCP_HST) && option_read_dynfile(path, AH_DHCP_HST))
+			  {
+			    /* Propagate the consequences of loading a new dhcp-host */
+			    dhcp_update_configs(daemon->dhcp_conf);
+			    lease_update_from_configs(); 
+			    lease_update_file(now); 
+			    lease_update_dns(1);
+			  }
+			
+			if (dd->flags & AH_DHCP_OPT)
+			  option_read_dynfile(path, AH_DHCP_OPT);
+		    
+			free(path);
+		      }
+		  }
+#endif
+		
 	      }
 	}
     }
+  
   return hit;
 }
 

src/lease.c

@@ -25,7 +25,7 @@ static int read_leases(time_t now, FILE *leasestream)
   unsigned long ei;
   union all_addr addr;
   struct dhcp_lease *lease;
-  int clid_len, hw_len, hw_type;
+  int opt_len, clid_len, hw_len, hw_type;
   int items;
  
   *daemon->dhcp_buff3 = *daemon->dhcp_buff2 = '\0';
@@ -55,6 +55,34 @@ static int read_leases(time_t now, FILE *leasestream)
 	    continue;
 	  }
 #endif
+
+	/* Weird backwards compatible way of adding extra fields to leases */
+	if ((strcmp(daemon->dhcp_buff3, "vendorclass") == 0 || strcmp(daemon->dhcp_buff3, "agent-info") == 0))
+	  {
+	    if (fscanf(leasestream, " %764s", daemon->packet) == 1)
+	      {
+		if (inet_pton(AF_INET, daemon->dhcp_buff2, &addr.addr4))
+		  lease = lease_find_by_addr(addr.addr4);
+#ifdef HAVE_DHCP6
+		else if (inet_pton(AF_INET6, daemon->dhcp_buff2, &addr.addr6))
+		  lease = lease6_find_by_plain_addr(&addr.addr6);
+#endif
+		else
+		  continue;
+		
+		if (lease)
+		  {
+		    opt_len = parse_hex(daemon->packet, (unsigned char *)daemon->packet, 255, NULL, NULL);
+		    
+		    if (strcmp(daemon->dhcp_buff3, "vendorclass") == 0)
+		      lease_set_vendorclass(lease, (unsigned char *)daemon->packet, opt_len);
+		    else if (strcmp(daemon->dhcp_buff3, "agent-info") == 0)
+		      lease_set_agent_id(lease, (unsigned char *)daemon->packet, opt_len);
+		  }
+	      }
+
+	    continue;
+	  }
 	
 	if (fscanf(leasestream, " %64s %255s %764s",
 		   daemon->namebuff, daemon->dhcp_buff, daemon->packet) != 3)
@@ -251,8 +279,8 @@ void lease_update_file(time_t now)
 {
   struct dhcp_lease *lease;
   time_t next_event;
-  int i, err = 0;
-
+  int i, err = 0, extras;
+  
   if (file_dirty != 0 && daemon->lease_stream)
     {
       errno = 0;
@@ -260,9 +288,11 @@ void lease_update_file(time_t now)
       if (errno != 0 || ftruncate(fileno(daemon->lease_stream), 0) != 0)
 	err = errno;
       
-      for (lease = leases; lease; lease = lease->next)
+      for (extras = 0, lease = leases; lease; lease = lease->next)
 	{
-
+	  if (lease->agent_id || lease->vendorclass)
+	    extras = 1;
+	  
 #ifdef HAVE_DHCP6
 	  if (lease->flags & (LEASE_TA | LEASE_NA))
 	    continue;
@@ -335,7 +365,37 @@ void lease_update_file(time_t now)
 	    }
 	}
 #endif      
-	  
+
+      if (extras)
+	{
+	  /* Dump this at the end for least confusion with older parsing code. */
+	  for (lease = leases; lease; lease = lease->next)
+	    {
+#ifdef HAVE_DHCP6
+	      if (lease->flags & (LEASE_TA | LEASE_NA))
+		inet_ntop(AF_INET6, &lease->addr6, daemon->addrbuff, ADDRSTRLEN);
+	      else
+#endif
+		inet_ntop(AF_INET, &lease->addr, daemon->addrbuff, ADDRSTRLEN);
+	      
+	      if (lease->agent_id)
+		{
+		  ourprintf(&err, "agent-info %s ", daemon->addrbuff);
+		  for (i = 0; i < lease->agent_id_len - 1; i++)
+		    ourprintf(&err, "%.2x:", lease->agent_id[i]);
+		  ourprintf(&err, "%.2x\n", lease->agent_id[i]);
+		}
+	      
+	      if (lease->vendorclass)
+		{
+		  ourprintf(&err, "vendorclass %s ", daemon->addrbuff);
+		  for (i = 0; i < lease->vendorclass_len - 1; i++)
+		    ourprintf(&err, "%.2x:", lease->vendorclass[i]);
+		  ourprintf(&err, "%.2x\n", lease->vendorclass[i]);
+		}
+	    }
+	}
+      
       if (fflush(daemon->lease_stream) != 0 ||
 	  fsync(fileno(daemon->lease_stream)) < 0)
 	err = errno;
@@ -713,6 +773,22 @@ struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 add
   return NULL;
 } 
 
+struct dhcp_lease *lease6_find_by_plain_addr(struct in6_addr *addr)
+{
+  struct dhcp_lease *lease;
+    
+  for (lease = leases; lease; lease = lease->next)
+    {
+      if (!(lease->flags & (LEASE_TA | LEASE_NA)))
+	continue;
+      
+      if (IN6_ARE_ADDR_EQUAL(&lease->addr6, addr))
+	return lease;
+    }
+  
+  return NULL;
+}
+
 /* Find largest assigned address in context */
 u64 lease_find_max_addr6(struct dhcp_context *context)
 {
@@ -1084,6 +1160,46 @@ void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now)
 #endif
 }
 
+void lease_set_agent_id(struct dhcp_lease *lease, unsigned char *new, int len)
+{
+
+  if (!lease->agent_id && !new)
+    return;
+  
+  if (lease->agent_id && new && lease->agent_id_len == len && memcmp(lease->agent_id, new, len) == 0)
+    return;
+
+  file_dirty = 1;
+  free(lease->agent_id);
+  lease->agent_id = NULL;
+  
+  if (new && (lease->agent_id = whine_malloc(len)))
+    {
+      memcpy(lease->agent_id, new, len);
+      lease->agent_id_len = len;
+    }
+}
+
+void lease_set_vendorclass(struct dhcp_lease *lease, unsigned char *new, int len)
+{
+  if (!lease->vendorclass && !new)
+    return;
+
+  if (lease->vendorclass && new && lease->vendorclass_len == len && memcmp(lease->vendorclass, new, len) == 0)
+    return;
+
+  file_dirty = 1;
+  free(lease->vendorclass);
+  lease->vendorclass = NULL;
+  
+  if (new && (lease->vendorclass = whine_malloc(len)))
+    {
+      memcpy(lease->vendorclass, new, len);
+      lease->vendorclass_len = len;
+    }
+}
+       
+
 void rerun_scripts(void)
 {
   struct dhcp_lease *lease;
@@ -1143,9 +1259,11 @@ int do_script_run(time_t now)
 #endif
 	  old_leases = lease->next;
 	  
-	  free(lease->old_hostname); 
+	  free(lease->hostname); 
 	  free(lease->clid);
 	  free(lease->extradata);
+	  free(lease->agent_id);
+	  free(lease->vendorclass);
 	  free(lease);
 	    
 	  return 1; 

src/metrics.c

@@ -43,6 +43,10 @@ const char * metric_names[] = {
     "leases_allocated_6",
     "leases_pruned_6",
     "tcp_connections",
+    "dhcp_leasequery",
+    "dhcp_lease_unassigned",
+    "dhcp_lease_actve",
+    "dhcp_lease_unknown"
 };
 
 const char* get_metric_name(int i) {

src/metrics.h

@@ -42,6 +42,10 @@ enum {
   METRIC_LEASES_ALLOCATED_6,
   METRIC_LEASES_PRUNED_6,
   METRIC_TCP_CONNECTIONS,
+  METRIC_DHCPLEASEQUERY,
+  METRIC_DHCPLEASEUNASSIGNED,
+  METRIC_DHCPLEASEACTIVE,
+  METRIC_DHCPLEASEUNKNOWN,
   
   __METRIC_MAX,
 };

src/network.c

@@ -1568,6 +1568,8 @@ void check_servers(int no_loop_check)
   struct serverfd *sfd, *tmp, **up;
   int port = 0, count;
   int locals = 0;
+
+  (void)no_loop_check;
   
 #ifdef HAVE_LOOP
   if (!no_loop_check)
@@ -1775,8 +1777,10 @@ int reload_servers(char *fname)
 /* Called when addresses are added or deleted from an interface */
 void newaddress(time_t now)
 {
+#ifdef HAVE_DHCP
   struct dhcp_relay *relay;
-
+#endif
+  
   (void)now;
   
   if (option_bool(OPT_CLEVERBIND) || option_bool(OPT_LOCAL_SERVICE) ||

src/option.c

@@ -195,6 +195,7 @@ struct myoption {
 #define LOPT_PXE_OPT       386
 #define LOPT_NO_ENCODE     387
 #define LOPT_DO_ENCODE     388
+#define LOPT_LEASEQUERY    389
 
 #ifdef HAVE_GETOPT_LONG
 static const struct option opts[] =  
@@ -394,6 +395,7 @@ static const struct myoption opts[] =
     { "use-stale-cache", 2, 0 , LOPT_STALE_CACHE },
     { "no-ident", 0, 0, LOPT_NO_IDENT },
     { "max-tcp-connections", 1, 0, LOPT_MAX_PROCS },
+    { "leasequery", 2, 0, LOPT_LEASEQUERY },
     { NULL, 0, 0, 0 }
   };
 
@@ -499,6 +501,7 @@ static struct {
   { '4', ARG_DUP, "set:<tag>,<mac address>", gettext_noop("Map MAC address (with wildcards) to option set."), NULL },
   { LOPT_BRIDGE, ARG_DUP, "<iface>,<alias>..", gettext_noop("Treat DHCP requests on aliases as arriving from interface."), NULL },
   { LOPT_SHARED_NET, ARG_DUP, "<iface>|<addr>,<addr>", gettext_noop("Specify extra networks sharing a broadcast domain for DHCP"), NULL},
+  { LOPT_LEASEQUERY, ARG_DUP, "[<addr>[/prefix>]]", gettext_noop("Enable RFC 4388 leasequery functions for DHCPv4"), NULL },
   { '5', OPT_NO_PING, NULL, gettext_noop("Disable ICMP echo address checking in the DHCP server."), NULL },
   { '6', ARG_ONE, "<path>", gettext_noop("Shell script to run on DHCP lease creation and destruction."), NULL },
   { LOPT_LUASCRIPT, ARG_DUP, "path", gettext_noop("Lua script to run on DHCP lease creation and destruction."), NULL },
@@ -2912,7 +2915,16 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	arg = comma;
       } while (arg);
       break;
-      
+
+#ifdef HAVE_DHCP
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+    case LOPT_LEASEQUERY:
+      set_option_bool(OPT_LEASEQUERY);
+      if (!arg)
+	break;
+#pragma GCC diagnostic pop
+#endif
     case 'B':  /* --bogus-nxdomain */
     case LOPT_IGNORE_ADDR: /* --ignore-address */
      {
@@ -2948,6 +2960,13 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	    baddr->next = daemon->bogus_addr;
 	    daemon->bogus_addr = baddr;
 	  }
+#ifdef HAVE_DHCP
+	else if (option == LOPT_LEASEQUERY)
+	  {
+	    baddr->next = daemon->leasequery_addr;
+	    daemon->leasequery_addr = baddr;
+	  }
+#endif
 	else
 	  {
 	    baddr->next = daemon->ignore_addr;

src/rfc1035.c

@@ -687,12 +687,12 @@ static int log_txt(char *name, unsigned char *p, const int ardlen, int flag)
    Return 2 if the packet is malformed.
 */
 int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t now, 
-		      struct ipsets *ipsets, struct ipsets *nftsets, int is_sign, int check_rebind,
+		      struct ipsets *ipsets, struct ipsets *nftsets, int check_rebind,
 		      int no_cache_dnssec, int secure)
 {
   unsigned char *p, *p1, *endrr, *namep;
   int j, qtype, qclass, aqtype, aqclass, ardlen, res;
-  unsigned long ttl = 0;
+  unsigned long ttl;
   union all_addr addr;
 #ifdef HAVE_IPSET
   char **ipsets_cur;
@@ -704,13 +704,8 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 #else
   (void)nftsets; /* unused */
 #endif
-  int found = 0, cname_count = CNAME_CHAIN;
-  struct crec *cpp = NULL;
+  int name_encoding, found = 0, ptr = 0;
   int flags = RCODE(header) == NXDOMAIN ? F_NXDOMAIN : 0;
-#ifdef HAVE_DNSSEC
-  int cname_short = 0;
-#endif
-  unsigned long cttl = ULONG_MAX, attl;
 
   cache_start_insert();
 
@@ -724,125 +719,73 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
   
   if (qclass != C_IN)
     return 0;
-  
-  /* PTRs: we chase CNAMEs here, since we have no way to 
-     represent them in the cache. */
-  if (qtype == T_PTR)
+
+  /* If the PTR record encodes an address, store using a name/address record with F_REVERSE set.
+     Otherwise, it gets stored as an arbitrary RR below. If the query is answerable with
+     a CNAME, also take the arbitrary-RR route, since the cache can't represent a CNAME
+     whose target is stored in a F_REVERSE record. */
+  if (qtype == T_PTR && !(flags & F_NXDOMAIN) && (name_encoding = in_arpa_name_2_addr(name, &addr)))
     { 
-      int insert = 1, name_encoding = in_arpa_name_2_addr(name, &addr);
+      ptr = 1;
       
-      if (!(flags & F_NXDOMAIN))
+      if (!(p1 = skip_questions(header, qlen)))
+	return 2;
+      
+      for (j = 0; j < ntohs(header->ancount); j++) 
 	{
-	cname_loop:
-	  if (!(p1 = skip_questions(header, qlen)))
-	    return 2;
+	  int secflag = 0;
+	  if (!(res = extract_name(header, qlen, &p1, name, EXTR_NAME_COMPARE, 10)))
+	    return 2; /* bad packet */
 	  
-	  for (j = 0; j < ntohs(header->ancount); j++) 
+	  GETSHORT(aqtype, p1); 
+	  GETSHORT(aqclass, p1);
+	  p = p1;
+	  GETLONG(ttl, p1);
+	  GETSHORT(ardlen, p1);
+	  endrr = p1+ardlen;
+	  
+	  if (aqclass == C_IN && res == 1 && aqtype == T_PTR)
 	    {
-	      int secflag = 0;
-	      if (!(res = extract_name(header, qlen, &p1, name, EXTR_NAME_COMPARE, 10)))
-		return 2; /* bad packet */
+	      found = 1;
+
+	      if ((daemon->max_ttl != 0) && (ttl > daemon->max_ttl))
+		ttl = daemon->max_ttl;
 	      
-	      GETSHORT(aqtype, p1); 
-	      GETSHORT(aqclass, p1);
-	      GETLONG(attl, p1);
-	      
-	      if ((daemon->max_ttl != 0) && (attl > daemon->max_ttl) && !is_sign)
-		{
-		  (p1) -= 4;
-		  PUTLONG(daemon->max_ttl, p1);
-		}
-	      GETSHORT(ardlen, p1);
-	      endrr = p1+ardlen;
-	      
-	      /* TTL of record is minimum of CNAMES and PTR */
-	      if (attl < cttl)
-		cttl = attl;
-	      
-	      if (aqclass == C_IN && res != 2 && (aqtype == T_CNAME || aqtype == T_PTR))
-		{
 #ifdef HAVE_DNSSEC
-		  if (option_bool(OPT_DNSSEC_VALID) && j < daemon->rr_status_sz && daemon->rr_status[j] != 0)
-		    {
-		      /* validated RR anywhere in CNAME chain, don't cache. */
-		      if (cname_short || aqtype == T_CNAME)
-			insert = 0;
-		      
-		      secflag = F_DNSSECOK;
-		      /* limit TTL based on signature. */
-		      if (daemon->rr_status[j] < cttl)
-			cttl = daemon->rr_status[j];
-		    }
-#endif
-
-		  if (aqtype == T_CNAME)
-		    log_query(secflag | F_CNAME | F_FORWARD | F_UPSTREAM, name, NULL, NULL, 0);
-		  
-		  if (!extract_name(header, qlen, &p1, name, EXTR_NAME_EXTRACT, 0))
-		    return 2;
-		  
-		  if (aqtype == T_CNAME)
-		    {
-		      if (!cname_count--)
-			return 0; /* looped CNAMES, we can't cache. */
-#ifdef HAVE_DNSSEC
-		      cname_short = 1;
-#endif
-		      goto cname_loop;
-		    }
-		  
-		  found = 1; 
-		  
-		  if (!name_encoding)
-		    log_query(secflag | F_FORWARD | F_UPSTREAM, name, NULL, NULL, aqtype);
-		  else
-		    {
-		      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);
-		    }
-		}
-
-	      p1 = endrr;
-	      if (!CHECK_LEN(header, p1, qlen, 0))
-		return 2; /* bad packet */
-	    }
-	}
-      
-      if (!found)
-	{
-	  flags |= F_NEG | (secure ?  F_DNSSECOK : 0);
-
-	  if (name_encoding)
-	    flags |= F_REVERSE | name_encoding;
-
-	  log_query(flags | F_UPSTREAM, name, &addr, NULL, 0);
-
-	  if (name_encoding && !option_bool(OPT_NO_NEG))
-	    {
-	      /* For reverse records, we use the name field to store the SOA name. */
-	      int substring, have_soa = find_soa(header, qlen, name, &substring, &ttl, no_cache_dnssec, now);
-
-	      if (have_soa || daemon->neg_ttl)
+	      if (option_bool(OPT_DNSSEC_VALID) && j < daemon->rr_status_sz && daemon->rr_status[j] != 0)
 		{
-		  /* If daemon->neg_ttl is set, we can cache even without an SOA. */
-		  if (!have_soa)
-		    {
-		      flags |= F_NO_RR; /* Marks no SOA found. */
-		      ttl = daemon->neg_ttl;
-		    }
-		  
-		  cache_insert(name + substring, &addr, C_IN, now, ttl, flags);
+		  secflag = F_DNSSECOK;
+		  /* limit TTL based on signature. */
+		  if (daemon->rr_status[j] < ttl)
+		    ttl = daemon->rr_status[j];
 		}
+#endif
+	      
+	      PUTLONG(ttl, p);
+
+	      if (!extract_name(header, qlen, &p1, name, EXTR_NAME_EXTRACT, 0))
+		return 2;
+	      log_query(name_encoding | secflag | F_REVERSE | F_UPSTREAM, name, &addr, NULL, 0);
+	      cache_insert(name, &addr, C_IN, now, ttl, name_encoding | secflag | F_REVERSE);
+	      
+	      /* restore query into name */
+	      p1 = namep;
+	      if (!extract_name(header, qlen, &p1, name, EXTR_NAME_EXTRACT, 0))
+		return 2;
 	    }
+	  
+	  p1 = endrr;
+	  if (!CHECK_LEN(header, p1, qlen, 0))
+	    return 2; /* bad packet */
 	}
     }
-  else
+
+  if (!ptr || !found)
     {
       /* everything other than PTR */
-      struct crec *newc;
-      int addrlen = 0, insert = 1;
-      
+      struct crec *newc, *cpp = NULL;
+      int cname_count = CNAME_CHAIN, addrlen = 0, insert = 1;
+            
       if (qtype == T_A)
 	{
 	  addrlen = INADDRSZ;
@@ -854,12 +797,12 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	  flags |= F_IPV6;
 	}
       else if (qtype != T_CNAME &&
-	       (qtype == T_SRV || rr_on_list(daemon->cache_rr, qtype) || rr_on_list(daemon->cache_rr, T_ANY)))
+	       (qtype == T_SRV || qtype == T_PTR || rr_on_list(daemon->cache_rr, qtype) || rr_on_list(daemon->cache_rr, T_ANY)))
 	flags |= F_RR;
       else
 	insert = 0; /* NOTE: do not cache data from CNAME queries. */
       
-    cname_loop1:
+    cname_loop:
       if (!(p1 = skip_questions(header, qlen)))
 	return 2;
       
@@ -872,12 +815,8 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	  
 	  GETSHORT(aqtype, p1); 
 	  GETSHORT(aqclass, p1);
-	  GETLONG(attl, p1);
-	  if ((daemon->max_ttl != 0) && (attl > daemon->max_ttl) && !is_sign)
-	    {
-	      (p1) -= 4;
-	      PUTLONG(daemon->max_ttl, p1);
-	    }
+	  p = p1;
+	  GETLONG(ttl, p1);
 	  GETSHORT(ardlen, p1);
 	  endrr = p1+ardlen;
 
@@ -890,6 +829,9 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      p1 = endrr;
 	      continue;
 	    }
+
+	  if ((daemon->max_ttl != 0) && (ttl > daemon->max_ttl))
+	    ttl = daemon->max_ttl;
 	  
 #ifdef HAVE_DNSSEC
 	  if (option_bool(OPT_DNSSEC_VALID) && j < daemon->rr_status_sz && daemon->rr_status[j] != 0)
@@ -897,10 +839,12 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      secflag = F_DNSSECOK;
 	      
 	      /* limit TTl based on sig. */
-	      if (daemon->rr_status[j] < attl)
-		attl = daemon->rr_status[j];
+	      if (daemon->rr_status[j] < ttl)
+		ttl = daemon->rr_status[j];
 	    }
 #endif	  
+
+	  PUTLONG(ttl, p);
 	  
 	  if (aqtype == T_CNAME)
 	    {
@@ -911,7 +855,7 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      
 	      if (insert)
 		{
-		  if ((newc = cache_insert(name, NULL, C_IN, now, attl, F_CNAME | F_FORWARD | secflag)))
+		  if ((newc = cache_insert(name, NULL, C_IN, now, ttl, F_CNAME | F_FORWARD | secflag)))
 		    {
 		      newc->addr.cname.target.cache = NULL;
 		      newc->addr.cname.is_name_ptr = 0; 
@@ -924,16 +868,15 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 		    }
 		  
 		  cpp = newc;
-		  if (attl < cttl)
-		    cttl = attl;
 		}
 	      
+	      /* Set the query to the CNAME target and go again unless the query was just for a CNAME. */
 	      namep = p1;
 	      if (!extract_name(header, qlen, &p1, name, EXTR_NAME_EXTRACT, 0))
 		return 2;
 	      
 	      if (qtype != T_CNAME)
-		goto cname_loop1;
+		goto cname_loop;
 
 	      found = 1;
 	    }
@@ -1089,7 +1032,7 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t
 	      
 	      if (insert)
 		{
-		  newc = cache_insert(name, &addr, C_IN, now, attl, flags | F_FORWARD | secflag);
+		  newc = cache_insert(name, &addr, C_IN, now, ttl, flags | F_FORWARD | secflag);
 		  if (newc && cpp)
 		    {
 		      next_uid(newc);
@@ -1668,7 +1611,7 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
   int rd_bit = (header->hb3 & HB3_RD);
   int count = 255; /* catch loops */
 
-  /* Suppress cached answers of no_cache set. */
+  /* Suppress cached answers if no_cache set. */
   if (no_cache)
     rd_bit = 0;
   
@@ -1678,14 +1621,12 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
   if (filtered)
     *filtered = 0;
   
-  /* never answer queries with RD unset, to avoid cache snooping. */
-  if ( ntohs(header->qdcount) != 1 ||
-       ntohs(header->ancount) != 0 ||
+  if (ntohs(header->qdcount) != 1 ||
+      ntohs(header->ancount) != 0 ||
       ntohs(header->nscount) != 0 ||
-      ntohs(header->qdcount) == 0 ||
       OPCODE(header) != QUERY )
     return 0;
-
+  
   /* Don't return AD set if checking disabled. */
   if (header->hb4 & HB4_CD)
     sec_data = 0;
@@ -2348,14 +2289,11 @@ size_t answer_request(struct dns_header *header, char *limit, size_t qlen,
      
      For FORWARD NEG records, the addr.rrdata.datalen field of the othewise
      empty addr is used to held an offset in to the name which yields the SOA
-     name. For REVERSE NEG records, the otherwise empty name field holds the
-     SOA name. If soa_name has zero length, then no SOA is known. soa_lookup
-     MUST be a neg record here.
-     
+     name.
      If the F_NO_RR flag is set, there was no SOA record supplied with the RR.  */
   if (soa_lookup && !(soa_lookup->flags & F_NO_RR))
     {
-      char *soa_name = soa_lookup->flags & F_REVERSE ? cache_get_name(soa_lookup) : name + soa_lookup->addr.rrdata.datalen;
+      char *soa_name = name + soa_lookup->addr.rrdata.datalen;
       
       crecp = NULL;
       while ((crecp = cache_find_by_name(crecp, soa_name, now, F_RR)))

src/rfc2131.c

@@ -56,7 +56,8 @@ static void do_options(struct dhcp_context *context,
 		       time_t now,
 		       unsigned int lease_time,
 		       unsigned short fuzz,
-		       const char *pxevendor);
+		       const char *pxevendor,
+		       int leasequery);
 
 
 static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt); 
@@ -73,7 +74,7 @@ static void handle_encap(struct dhcp_packet *mess, unsigned char *end, unsigned
 
 size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 		  size_t sz, time_t now, int unicast_dest, int loopback,
-		  int *is_inform, int pxe, struct in_addr fallback, time_t recvtime)
+		  int *is_inform, int pxe, struct in_addr fallback, time_t recvtime, struct in_addr leasequery_source)
 {
   unsigned char *opt, *clid = NULL;
   struct dhcp_lease *ltmp, *lease = NULL;
@@ -108,7 +109,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 #endif
 
   subnet_addr.s_addr = override.s_addr = 0;
-
+          
   /* set tag with name == interface */
   iface_id.net = iface_name;
   iface_id.next = NULL;
@@ -185,7 +186,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	    }
 	}
       
-      if ((opt = option_find(mess, sz, OPTION_AGENT_ID, 1)))
+      if (mess_type != DHCPLEASEQUERY && (opt = option_find(mess, sz, OPTION_AGENT_ID, 1)))
 	{
 	  /* Any agent-id needs to be copied back out, verbatim, as the last option
 	     in the packet. Here, we shift it to the very end of the buffer, if it doesn't
@@ -211,7 +212,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	  if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SERVER_OR, INADDRSZ)))
 	    override = option_addr(sopt);
 	  
-	  /* if a circuit-id or remote-is option is provided, exact-match to options. */ 
+	  /* if a circuit-id or remote-is option is provided, exact-match to options. */
 	  for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
 	    {
 	      int search;
@@ -224,7 +225,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 		search = SUBOPT_SUBSCR_ID;
 	      else 
 		continue;
-
+	      
 	      if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), search, 1)) &&
 		  vendor->len == option_len(sopt) &&
 		  memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0)
@@ -234,7 +235,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 		} 
 	    }
 	}
-
+      
       /* Check for RFC3011 subnet selector - only if RFC3527 one not present */
       if (subnet_addr.s_addr == 0 && (opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ)))
 	subnet_addr = option_addr(opt);
@@ -373,44 +374,47 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	context = context_new; 
     }
   
-  if (!context)
+  if (mess_type != DHCPLEASEQUERY)
     {
-      const char *via;
-      if (subnet_addr.s_addr)
+      if  (!context)
 	{
-	  via = _("with subnet selector");
-	  inet_ntop(AF_INET, &subnet_addr, daemon->addrbuff, ADDRSTRLEN);
-	}
-      else
-	{
-	  via = _("via");
-	  if (mess->giaddr.s_addr)
-	    inet_ntop(AF_INET, &mess->giaddr, daemon->addrbuff, ADDRSTRLEN);
-	  else
-	    safe_strncpy(daemon->addrbuff, iface_name, ADDRSTRLEN);
-	}
-      my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"),
-		via, daemon->addrbuff);
-      return 0;
-    }
-
-  if (option_bool(OPT_LOG_OPTS))
-    {
-      struct dhcp_context *context_tmp;
-      for (context_tmp = context; context_tmp; context_tmp = context_tmp->current)
-	{
-	  inet_ntop(AF_INET, &context_tmp->start, daemon->namebuff, MAXDNAME);
-	  if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY))
+	  const char *via;
+	  if (subnet_addr.s_addr)
 	    {
-	      inet_ntop(AF_INET, &context_tmp->netmask, daemon->addrbuff, ADDRSTRLEN);
-	      my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP subnet: %s/%s"),
-			ntohl(mess->xid), daemon->namebuff, daemon->addrbuff);
+	      via = _("with subnet selector");
+	      inet_ntop(AF_INET, &subnet_addr, daemon->addrbuff, ADDRSTRLEN);
 	    }
 	  else
 	    {
-	      inet_ntop(AF_INET, &context_tmp->end, daemon->addrbuff, ADDRSTRLEN);
-	      my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP range: %s -- %s"),
-			ntohl(mess->xid), daemon->namebuff, daemon->addrbuff);
+	      via = _("via");
+	      if (mess->giaddr.s_addr)
+		inet_ntop(AF_INET, &mess->giaddr, daemon->addrbuff, ADDRSTRLEN);
+	      else
+		safe_strncpy(daemon->addrbuff, iface_name, ADDRSTRLEN);
+	    }
+	  my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"),
+		    via, daemon->addrbuff);
+	  return 0;
+	}
+      
+      if (option_bool(OPT_LOG_OPTS))
+	{
+	  struct dhcp_context *context_tmp;
+	  for (context_tmp = context; context_tmp; context_tmp = context_tmp->current)
+	    {
+	      inet_ntop(AF_INET, &context_tmp->start, daemon->namebuff, MAXDNAME);
+	      if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY))
+		{
+		  inet_ntop(AF_INET, &context_tmp->netmask, daemon->addrbuff, ADDRSTRLEN);
+		  my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP subnet: %s/%s"),
+			    ntohl(mess->xid), daemon->namebuff, daemon->addrbuff);
+		}
+	      else
+		{
+		  inet_ntop(AF_INET, &context_tmp->end, daemon->addrbuff, ADDRSTRLEN);
+		  my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP range: %s -- %s"),
+			    ntohl(mess->xid), daemon->namebuff, daemon->addrbuff);
+		}
 	    }
 	}
     }
@@ -672,7 +676,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	      
 	      clear_packet(mess, end);
 	      do_options(context, mess, end, NULL, hostname, get_domain(mess->yiaddr), 
-			 netid, subnet_addr, 0, 0, -1, NULL, vendor_class_len, now, 0xffffffff, 0, NULL);
+			 netid, subnet_addr, 0, 0, -1, NULL, vendor_class_len, now, 0xffffffff, 0, NULL, 0);
 	    }
 	}
       
@@ -818,8 +822,8 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	    }
 	}
     }
-  
-  if (config)
+
+  if (mess_type != DHCPLEASEQUERY && config)
     {
       struct dhcp_netid_list *list;
       
@@ -860,7 +864,8 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
     clid = NULL;
           
   /* Check if client is PXE client. */
-  if (daemon->enable_pxe &&
+  if (mess_type != DHCPLEASEQUERY &&
+      daemon->enable_pxe &&
       is_pxe_client(mess, sz, &pxevendor))
     {
       if ((opt = option_find(mess, sz, OPTION_PXE_UUID, 17)))
@@ -1035,7 +1040,8 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
     }
 
   /* if we're just a proxy server, go no further */
-  if ((context->flags & CONTEXT_PROXY) || pxe)
+  if (mess_type != DHCPLEASEQUERY &&
+      ((context->flags & CONTEXT_PROXY) || pxe))
     return 0;
   
   if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0)))
@@ -1047,6 +1053,176 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
   
   switch (mess_type)
     {
+    case DHCPLEASEQUERY:
+      mess_type = DHCPLEASEUNKNOWN;
+      
+      if (!option_bool(OPT_LEASEQUERY))
+	return 0;
+      
+      if (leasequery_source.s_addr == 0)
+	return 0;
+
+      inet_ntop(AF_INET, &leasequery_source, daemon->workspacename, ADDRSTRLEN);
+
+      if (daemon->leasequery_addr)
+	{
+	  struct bogus_addr *baddrp;
+
+	  for (baddrp = daemon->leasequery_addr; baddrp; baddrp = baddrp->next)
+	    if (!baddrp->is6 && is_same_net_prefix(leasequery_source, baddrp->addr.addr4, baddrp->prefix))
+	      break;
+	  
+	  if (!baddrp)
+	    {
+	      my_syslog(MS_DHCP | LOG_WARNING, _("leasequery from %s not permitted"), daemon->workspacename);
+	      return 0;
+	    }
+	}
+      
+      daemon->metrics[METRIC_DHCPLEASEQUERY]++;
+      log_packet("DHCPLEASEQUERY", mess->ciaddr.s_addr ? &mess->ciaddr : NULL, emac_len != 0 ? emac : NULL, emac_len,
+		 iface_name, "from ", daemon->workspacename, mess->xid);
+
+      /* Put all the contexts on the ->current list for the next stages. */
+      for (context = daemon->dhcp; context; context = context->next)
+	context->current = context->next;
+      
+      /* Have maybe already found the lease by MAC or clid. */
+      if (mess->ciaddr.s_addr != 0 &&
+	  !(lease = lease_find_by_addr(mess->ciaddr)) &&
+	  address_available(daemon->dhcp, mess->ciaddr, tagif_netid))
+	{
+	  mess_type = DHCPLEASEUNASSIGNED;
+	  daemon->metrics[METRIC_DHCPLEASEUNASSIGNED]++;
+	}
+      
+      if (lease)
+	{
+	  /* RFC4388 para 6.4.2 */
+	  if (lease->agent_id)
+	    {
+	      unsigned char *sopt ;
+	      
+	      for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
+		{
+		  int search;
+		  
+		  if (vendor->match_type == MATCH_CIRCUIT)
+		    search = SUBOPT_CIRCUIT_ID;
+		  else if (vendor->match_type == MATCH_REMOTE)
+		    search = SUBOPT_REMOTE_ID;
+		  else if (vendor->match_type == MATCH_SUBSCRIBER)
+		    search = SUBOPT_SUBSCR_ID;
+		  else 
+		    continue;
+		  
+		  if ((sopt = option_find1(lease->agent_id, lease->agent_id + lease->agent_id_len, search, 1)) &&
+		      vendor->len == option_len(sopt) &&
+		      memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0)
+		    {
+		      vendor->netid.next = netid;
+		      netid = &vendor->netid;
+		    }
+		}
+	      
+	      tagif_netid = run_tag_if(netid);
+	    }
+	  
+	  /* Now find the context for this lease and config for this host. */
+	  if ((context = narrow_context(daemon->dhcp, lease->addr, tagif_netid)))
+	    {
+	      if ((config = find_config(daemon->dhcp_conf, context, lease->clid, lease->clid_len, 
+					lease->hwaddr, lease->hwaddr_len, lease->hwaddr_type, lease->hostname, tagif_netid)))
+		{
+		  struct dhcp_netid_list *list;
+		  
+		  for (list = config->netid; list; list = list->next)
+		    {
+		      list->list->next = netid;
+		      netid = list->list;
+		    }
+
+		  tagif_netid = run_tag_if(netid);
+		}
+	      
+	      if (context->netid.net)
+		{
+		  context->netid.next = netid;
+		  tagif_netid = run_tag_if(&context->netid);
+		}
+
+	      log_tags(tagif_netid, ntohl(mess->xid));
+	      emac = extended_hwaddr(lease->hwaddr_type, lease->hwaddr_len, lease->hwaddr, lease->clid_len, lease->clid, &emac_len);
+	      mess_type = DHCPLEASEACTIVE;
+	      daemon->metrics[METRIC_DHCPLEASEACTIVE]++;
+	    }
+	}
+      
+      log_packet(mess_type == DHCPLEASEACTIVE ? "DHCPLEASEACTIVE" : (mess_type == DHCPLEASEUNASSIGNED ? "DHCPLEASEUNASSIGNED" : "DHCPLEASEUNKNOWN"),
+		 mess_type == DHCPLEASEACTIVE ? &lease->addr : (mess->ciaddr.s_addr != 0 ? &mess->ciaddr : NULL),
+		 emac_len != 0 ? emac : NULL, emac_len,
+		 iface_name, mess_type == DHCPLEASEACTIVE ? lease->hostname : NULL, NULL, mess->xid);
+      
+      clear_packet(mess, end);
+      option_put(mess, end, OPTION_MESSAGE_TYPE, 1, mess_type);
+      
+      if (mess_type == DHCPLEASEUNKNOWN)
+	{
+	  daemon->metrics[METRIC_DHCPLEASEUNKNOWN]++;
+	  mess->ciaddr.s_addr = 0;
+	}
+      
+      if (mess_type == DHCPLEASEACTIVE)
+	{
+	  unsigned char *p;
+	  
+	  mess->ciaddr = lease->addr;
+	  mess->hlen = lease->hwaddr_len;
+	  mess->htype = lease->hwaddr_type;
+	  memcpy(mess->chaddr, lease->hwaddr, lease->hwaddr_len);
+	  
+	  if (lease->clid && in_list(req_options, OPTION_CLIENT_ID) &&
+	      (p = free_space(mess, end, OPTION_CLIENT_ID, lease->clid_len)))
+	    memcpy(p, lease->clid, lease->clid_len);
+	  
+	  if (in_list(req_options, OPTION_LEASE_TIME))
+	    {
+	      if (lease->expires == 0) /* infinite lease */
+		option_put(mess, end, OPTION_LEASE_TIME, 4, 0xffffffff);
+	      else
+		option_put(mess, end, OPTION_LEASE_TIME, 4, (unsigned int)(lease->expires - now));
+	    }
+	  
+	  if (lease->expires != 0)
+	    {
+	      time = calc_time(context, config, NULL);
+
+	      if (in_list(req_options, OPTION_T1) && (lease->expires - now) > time/2)
+		option_put(mess, end, OPTION_T1, 4, ((unsigned int)(lease->expires - now)) - time/2);
+	      if (in_list(req_options, OPTION_T2) && (lease->expires - now) > time/8)
+		option_put(mess, end, OPTION_T2, 4, ((unsigned int)(lease->expires - now)) - time/8);
+	      if (in_list(req_options, OPTION_LAST_TRANSACTION) && (lease->expires - now) < time)
+		option_put(mess, end, OPTION_LAST_TRANSACTION, 4, time - ((unsigned int)(lease->expires - now)));
+	    }
+	  
+	  if (lease->vendorclass)
+	    {
+	      memcpy(daemon->dhcp_buff3, lease->vendorclass, lease->vendorclass_len);
+	      vendor_class_len = lease->vendorclass_len;
+	    }
+	  
+	  subnet_addr.s_addr = 0;
+	  do_options(context, mess, end, req_options, lease->hostname, get_domain(lease->addr), netid, subnet_addr,
+		     0, 0, -1, NULL, vendor_class_len, now, 0xffffffff, 0, NULL, 1);
+	  
+	  /* Does this have to be last for leasequery replies also? RFC 4388 is silent on the subject. */
+	  if (lease->agent_id && in_list(req_options, OPTION_AGENT_ID) &&
+	      (p = free_space(mess, end, OPTION_AGENT_ID, lease->agent_id_len)))
+	    memcpy(p, lease->agent_id, lease->agent_id_len);
+	}
+      
+      return dhcp_packet_size(mess, NULL, real_end);
+            
     case DHCPDECLINE:
       if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
 	  option_addr(opt).s_addr != server_id(context, override, fallback).s_addr)
@@ -1197,7 +1373,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
       option_put(mess, end, OPTION_LEASE_TIME, 4, time);
       /* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */
       do_options(context, mess, end, req_options, offer_hostname, get_domain(mess->yiaddr), 
-		 netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now, time, fuzz, pxevendor);
+		 netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now, time, fuzz, pxevendor, 0);
       
       return dhcp_packet_size(mess, agent_id, real_end);
 	
@@ -1528,7 +1704,21 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	  
 	  lease_set_expires(lease, time, now);
 	  lease_set_interface(lease, int_index, now);
-
+	  
+	  if (option_bool(OPT_LEASEQUERY))
+	    {
+	      if (agent_id)
+		lease_set_agent_id(lease, option_ptr(agent_id, 0), option_len(agent_id));
+	      if (vendor_class_len != 0)
+		lease_set_vendorclass(lease, (unsigned char *)daemon->dhcp_buff3, vendor_class_len);
+	    }
+	  else
+	    {
+	      /* if leasequery no longer enabled, remove stuff that may have been stored when it was. */
+	      lease_set_agent_id(lease, NULL, 0);
+	      lease_set_vendorclass(lease, NULL, 0);
+	    }
+	  
 	  if (override.s_addr != 0)
 	    lease->override = override;
 	  else
@@ -1544,7 +1734,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	  if (rapid_commit)
 	     option_put(mess, end, OPTION_RAPID_COMMIT, 0, 0);
 	   do_options(context, mess, end, req_options, hostname, get_domain(mess->yiaddr), 
-		     netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now, time, fuzz, pxevendor);
+		      netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now, time, fuzz, pxevendor, 0);
 	}
 
       return dhcp_packet_size(mess, agent_id, real_end); 
@@ -1611,7 +1801,7 @@ size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index,
 	}
 
       do_options(context, mess, end, req_options, hostname, get_domain(mess->ciaddr),
-		 netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now, 0xffffffff, 0, pxevendor);
+		 netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now, 0xffffffff, 0, pxevendor, 0);
       
       *is_inform = 1; /* handle reply differently */
       return dhcp_packet_size(mess, agent_id, real_end); 
@@ -1720,29 +1910,33 @@ static void log_packet(char *type, void *addr, unsigned char *ext_mac,
   if (!err && !option_bool(OPT_LOG_OPTS) && option_bool(OPT_QUIET_DHCP))
     return;
   
-  daemon->addrbuff[0] = 0;
+  daemon->addrbuff[0] = daemon->namebuff[0] = 0;
+  
   if (addr)
     inet_ntop(AF_INET, addr, daemon->addrbuff, ADDRSTRLEN);
   
-  print_mac(daemon->namebuff, ext_mac, mac_len);
+  if (ext_mac)
+    print_mac(daemon->namebuff, ext_mac, mac_len);
   
   if (option_bool(OPT_LOG_OPTS))
-    my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s %s%s",
+    my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s%s%s%s",
 	      ntohl(xid), 
 	      type,
 	      interface, 
 	      daemon->addrbuff,
 	      addr ? " " : "",
 	      daemon->namebuff,
+	      ext_mac ? " " : "",
 	      string ? string : "",
 	      err ? err : "");
   else
-    my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s %s%s",
+    my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s%s%s%s",
 	      type,
 	      interface, 
 	      daemon->addrbuff,
 	      addr ? " " : "",
 	      daemon->namebuff,
+	      ext_mac ? " " : "",
 	      string ? string : "",
 	      err ? err : "");
   
@@ -2412,7 +2606,8 @@ static void do_options(struct dhcp_context *context,
 		       time_t now,
 		       unsigned int lease_time,
 		       unsigned short fuzz,
-		       const char *pxevendor)
+		       const char *pxevendor,
+		       int leasequery)
 {
   struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts;
   struct dhcp_boot *boot;
@@ -2450,70 +2645,73 @@ static void do_options(struct dhcp_context *context,
 	}
     }
       
-  for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next)
-    if ((!id_list->list) || match_netid(id_list->list, netid, 0))
-      break;
-  if (id_list)
-    mess->flags |= htons(0x8000); /* force broadcast */
-  
-  if (context)
-    mess->siaddr = context->local;
-  
-  /* See if we can send the boot stuff as options.
-     To do this we need a requested option list, BOOTP
-     and very old DHCP clients won't have this, we also 
-     provide a manual option to disable it.
-     Some PXE ROMs have bugs (surprise!) and need zero-terminated 
-     names, so we always send those.  */
-  if ((boot = find_boot(tagif)))
+  if (!leasequery)
     {
-      if (boot->sname)
-	{	  
-	  if (!option_bool(OPT_NO_OVERRIDE) &&
-	      req_options && 
-	      in_list(req_options, OPTION_SNAME))
-	    option_put_string(mess, end, OPTION_SNAME, boot->sname, 1);
-	  else
-	    safe_strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname));
-	}
+      for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next)
+	if ((!id_list->list) || match_netid(id_list->list, netid, 0))
+	  break;
+      if (id_list)
+	mess->flags |= htons(0x8000); /* force broadcast */
       
-      if (boot->file)
+      if (context)
+	mess->siaddr = context->local;
+     
+      /* See if we can send the boot stuff as options.
+	 To do this we need a requested option list, BOOTP
+	 and very old DHCP clients won't have this, we also 
+	 provide a manual option to disable it.
+	 Some PXE ROMs have bugs (surprise!) and need zero-terminated 
+	 names, so we always send those.  */
+      if ((boot = find_boot(tagif)))
 	{
-	  if (!option_bool(OPT_NO_OVERRIDE) &&
-	      req_options && 
-	      in_list(req_options, OPTION_FILENAME))
-	    option_put_string(mess, end, OPTION_FILENAME, boot->file, 1);
-	  else
-	    safe_strncpy((char *)mess->file, boot->file, sizeof(mess->file));
+	  if (boot->sname)
+	    {	  
+	      if (!option_bool(OPT_NO_OVERRIDE) &&
+		  req_options && 
+		  in_list(req_options, OPTION_SNAME))
+		option_put_string(mess, end, OPTION_SNAME, boot->sname, 1);
+	      else
+		safe_strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname));
+	    }
+	  
+	  if (boot->file)
+	    {
+	      if (!option_bool(OPT_NO_OVERRIDE) &&
+		  req_options && 
+		  in_list(req_options, OPTION_FILENAME))
+		option_put_string(mess, end, OPTION_FILENAME, boot->file, 1);
+	      else
+		safe_strncpy((char *)mess->file, boot->file, sizeof(mess->file));
+	    }
+	  
+	  if (boot->next_server.s_addr) 
+	    mess->siaddr = boot->next_server;
+	  else if (boot->tftp_sname)
+	    mess->siaddr = a_record_from_hosts(boot->tftp_sname, now);
 	}
-      
-      if (boot->next_server.s_addr) 
-	mess->siaddr = boot->next_server;
-      else if (boot->tftp_sname)
-	mess->siaddr = a_record_from_hosts(boot->tftp_sname, now);
-    }
-  else
-    /* Use the values of the relevant options if no dhcp-boot given and
-       they're not explicitly asked for as options. OPTION_END is used
-       as an internal way to specify siaddr without using dhcp-boot, for use in
-       dhcp-optsfile. */
-    {
-      if ((!req_options || !in_list(req_options, OPTION_FILENAME)) &&
-	  (opt = option_find2(OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE))
+      else
+	/* Use the values of the relevant options if no dhcp-boot given and
+	   they're not explicitly asked for as options. OPTION_END is used
+	   as an internal way to specify siaddr without using dhcp-boot, for use in
+	   dhcp-optsfile. */
 	{
-	  safe_strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file));
-	  done_file = 1;
+	  if ((!req_options || !in_list(req_options, OPTION_FILENAME)) &&
+	      (opt = option_find2(OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE))
+	    {
+	      safe_strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file));
+	      done_file = 1;
+	    }
+	  
+	  if ((!req_options || !in_list(req_options, OPTION_SNAME)) &&
+	      (opt = option_find2(OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE))
+	    {
+	      safe_strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname));
+	      done_server = 1;
+	    }
+	  
+	  if ((opt = option_find2(OPTION_END)))
+	    mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr;	
 	}
-      
-      if ((!req_options || !in_list(req_options, OPTION_SNAME)) &&
-	  (opt = option_find2(OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE))
-	{
-	  safe_strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname));
-	  done_server = 1;
-	}
-      
-      if ((opt = option_find2(OPTION_END)))
-	mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr;	
     }
         
   /* We don't want to do option-overload for BOOTP, so make the file and sname
@@ -2534,7 +2732,7 @@ static void do_options(struct dhcp_context *context,
     end -= 3;
 
   /* rfc3011 says this doesn't need to be in the requested options list. */
-  if (subnet_addr.s_addr)
+  if (!leasequery && subnet_addr.s_addr)
     option_put(mess, end, OPTION_SUBNET_SELECT, INADDRSZ, ntohl(subnet_addr.s_addr));
    
   if (lease_time != 0xffffffff)
@@ -2575,14 +2773,17 @@ static void do_options(struct dhcp_context *context,
   /* replies to DHCPINFORM may not have a valid context */
   if (context)
     {
-      if (!option_find2(OPTION_NETMASK))
+      /* Netmask and broadcast always sent, except leasequery. */
+      if (!option_find2(OPTION_NETMASK) &&
+	  (!leasequery || in_list(req_options, OPTION_NETMASK)))
 	option_put(mess, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr));
-  
+      
       /* May not have a "guessed" broadcast address if we got no packets via a relay
 	 from this net yet (ie just unicast renewals after a restart */
       if (context->broadcast.s_addr &&
-	  !option_find2(OPTION_BROADCAST))
-	option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr));
+	  !option_find2(OPTION_BROADCAST) &&
+	  (!leasequery || in_list(req_options, OPTION_BROADCAST)))
+    	option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr));
       
       /* Same comments as broadcast apply, and also may not be able to get a sensible
 	 default when using subnet select.  User must configure by steam in that case. */
@@ -2663,7 +2864,7 @@ static void do_options(struct dhcp_context *context,
 	continue;
       
       /* was it asked for, or are we sending it anyway? */
-      if (!(opt->flags & DHOPT_FORCE) && !in_list(req_options, optno))
+      if ((!(opt->flags & DHOPT_FORCE) || leasequery) && !in_list(req_options, optno))
 	continue;
       
       /* prohibit some used-internally options. T1 and T2 already handled. */
@@ -2721,7 +2922,7 @@ static void do_options(struct dhcp_context *context,
   handle_encap(mess, end, req_options, null_term, tagif, pxe_arch != 1);
   
   force_encap = prune_vendor_opts(tagif);
-  
+    
   if (context && pxe_arch != -1)
     {
       pxe_misc(mess, end, uuid, pxevendor);
@@ -2729,8 +2930,8 @@ static void do_options(struct dhcp_context *context,
 	config_opts = pxe_opts(pxe_arch, tagif, context->local, now);
     }
 
-  if ((force_encap || in_list(req_options, OPTION_VENDOR_CLASS_OPT)) &&
-      do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term) && 
+  if ((force_encap || in_list(req_options, OPTION_VENDOR_CLASS_OPT) || in_list(req_options, OPTION_VENDOR_ID)) &&
+      (leasequery || do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term)) && 
       pxe_arch == -1 && !done_vendor_class && vendor_class_len != 0 &&
       (p = free_space(mess, end, OPTION_VENDOR_ID, vendor_class_len)))
     /* If we send vendor encapsulated options, and haven't already sent option 60,

src/tftp.c

@@ -41,11 +41,11 @@ static void sanitise(char *buf);
 #define ERR_ILL    4
 #define ERR_TID    5
 
-void tftp_request(struct listener *listen, time_t now)
+static void tftp_request(struct listener *listen, time_t now)
 {
   ssize_t len;
   char *packet = daemon->packet;
-  char *filename, *mode, *p, *end, *opt;
+  char *filename, *mode, *p, *end;
   union mysockaddr addr, peer;
   struct msghdr msg;
   struct iovec iov;
@@ -198,11 +198,11 @@ void tftp_request(struct listener *listen, time_t now)
 
       name = namebuff;
       
-      addra.addr4 = addr.in.sin_addr;
-
       if (family == AF_INET6)
 	addra.addr6 = addr.in6.sin6_addr;
-
+      else
+	addra.addr4 = addr.in.sin_addr;
+      
       if (daemon->tftp_interfaces)
 	{
 	  /* dedicated tftp interface list */
@@ -308,7 +308,9 @@ void tftp_request(struct listener *listen, time_t now)
   /* May reuse struct transfer from abandoned transfer in single port mode. */
   if (!transfer && !(transfer = whine_malloc(sizeof(struct tftp_transfer))))
     return;
-  
+
+  memset(transfer, 0, sizeof(struct tftp_transfer));
+	 
   if (option_bool(OPT_SINGLE_PORT))
     transfer->sockfd = listen->tftpfd;
   else if ((transfer->sockfd = socket(family, SOCK_DGRAM, 0)) == -1)
@@ -320,15 +322,13 @@ void tftp_request(struct listener *listen, time_t now)
   transfer->peer = peer;
   transfer->source = addra;
   transfer->if_index = if_index;
-  transfer->timeout = now + 2;
+  transfer->timeout = 2;
+  transfer->start = now;
   transfer->backoff = 1;
   transfer->block = 1;
   transfer->blocksize = 512;
-  transfer->offset = 0;
-  transfer->file = NULL;
-  transfer->opt_blocksize = transfer->opt_transize = 0;
-  transfer->netascii = transfer->carrylf = 0;
- 
+  transfer->windowsize = 1;
+  
   (void)prettyprint_addr(&peer, daemon->addrbuff);
   
   /* if we have a nailed-down range, iterate until we find a free one. */
@@ -361,136 +361,167 @@ void tftp_request(struct listener *listen, time_t now)
   
   p = packet + 2;
   end = packet + len;
+
+  len = 0;
   
-  if (ntohs(*((unsigned short *)packet)) != OP_RRQ ||
-      !(filename = next(&p, end)) ||
-      !(mode = next(&p, end)) ||
-      (strcasecmp(mode, "octet") != 0 && strcasecmp(mode, "netascii") != 0))
+  if (ntohs(*((unsigned short *)packet)) == OP_WRQ)
+    len = tftp_err(ERR_ILL, packet, _("unsupported write request from %s"),daemon->addrbuff, NULL);
+  else if (ntohs(*((unsigned short *)packet)) == OP_RRQ)
     {
-      len = tftp_err(ERR_ILL, packet, _("unsupported request from %s"), daemon->addrbuff, NULL);
-      is_err = 1;
-    }
-  else
-    {
-      if (strcasecmp(mode, "netascii") == 0)
-	transfer->netascii = 1;
-      
-      while ((opt = next(&p, end)))
+      if (!(filename = next(&p, end)))
+	len = tftp_err(ERR_ILL, packet, _("empty filename in request from %s"), daemon->addrbuff, NULL);
+      else if (!(mode = next(&p, end)) || (strcasecmp(mode, "octet") != 0 && strcasecmp(mode, "netascii") != 0))
+	len = tftp_err(ERR_ILL, packet, _("unsupported request from %s"),daemon->addrbuff, NULL);
+      else
 	{
-	  if (strcasecmp(opt, "blksize") == 0)
+	  char *opt, *arg;
+	  
+	  if (strcasecmp(mode, "netascii") == 0)
+	    transfer->netascii = 1;
+	  
+	  while ((opt = next(&p, end)) && (arg = next(&p, end)))
 	    {
-	      if ((opt = next(&p, end)) && !option_bool(OPT_TFTP_NOBLOCK))
+	      unsigned int val = atoi(arg);
+	      
+	      if (strcasecmp(opt, "blksize") == 0 && !option_bool(OPT_TFTP_NOBLOCK))
 		{
 		  /* 32 bytes for IP, UDP and TFTP headers, 52 bytes for IPv6 */
 		  int overhead = (family == AF_INET) ? 32 : 52;
-		  transfer->blocksize = atoi(opt);
-		  if (transfer->blocksize < 1)
-		    transfer->blocksize = 1;
-		  if (transfer->blocksize > (unsigned)daemon->packet_buff_sz - 4)
-		    transfer->blocksize = (unsigned)daemon->packet_buff_sz - 4;
-		  if (mtu != 0 && transfer->blocksize > (unsigned)mtu - overhead)
-		    transfer->blocksize = (unsigned)mtu - overhead;
+		  if (val < 1)
+		    val  = 1;
+		  if (val > (unsigned)daemon->packet_buff_sz - 4)
+		    val  = (unsigned)daemon->packet_buff_sz - 4;
+		  if (mtu != 0 && val > (unsigned)mtu - overhead)
+		    val  = (unsigned)mtu - overhead;
+		  transfer->blocksize = val;
 		  transfer->opt_blocksize = 1;
 		  transfer->block = 0;
 		}
-	    }
-	  else if (strcasecmp(opt, "tsize") == 0 && next(&p, end) && !transfer->netascii)
-	    {
-	      transfer->opt_transize = 1;
-	      transfer->block = 0;
-	    }
-	}
-
-      /* cope with backslashes from windows boxen. */
-      for (p = filename; *p; p++)
-	if (*p == '\\')
-	  *p = '/';
-	else if (option_bool(OPT_TFTP_LC))
-	  *p = tolower((unsigned char)*p);
-		
-      strcpy(daemon->namebuff, "/");
-      if (prefix)
-	{
-	  if (prefix[0] == '/')
-	    daemon->namebuff[0] = 0;
-	  strncat(daemon->namebuff, prefix, (MAXDNAME-1) - strlen(daemon->namebuff));
-	  if (prefix[strlen(prefix)-1] != '/')
-	    strncat(daemon->namebuff, "/", (MAXDNAME-1) - strlen(daemon->namebuff));
-
-	  if (option_bool(OPT_TFTP_APREF_IP))
-	    {
-	      size_t oldlen = strlen(daemon->namebuff);
-	      struct stat statbuf;
-	      
-	      strncat(daemon->namebuff, daemon->addrbuff, (MAXDNAME-1) - strlen(daemon->namebuff));
-	      strncat(daemon->namebuff, "/", (MAXDNAME-1) - strlen(daemon->namebuff));
-	      
-	      /* remove unique-directory if it doesn't exist */
-	      if (stat(daemon->namebuff, &statbuf) == -1 || !S_ISDIR(statbuf.st_mode))
-		daemon->namebuff[oldlen] = 0;
+	      else if (strcasecmp(opt, "tsize") == 0 && !transfer->netascii)
+		{
+		  transfer->opt_transize = 1;
+		  transfer->block = 0;
+		}
+	      else if (strcasecmp(opt, "timeout") == 0)
+		{
+		  if (val > 255)
+		    val = 255;
+		  transfer->timeout = val;
+		  transfer->opt_timeout = 1;
+		  transfer->block = 0;
+		}
+	      else if (strcasecmp(opt, "windowsize") == 0 && !transfer->netascii)
+		{
+		  /* windowsize option only supported for binary transfers. */
+		  if (val < 1)
+		    val = 1;
+		  if (val > TFTP_MAX_WINDOW)
+		    val = TFTP_MAX_WINDOW;
+		  transfer->windowsize = val;
+		  transfer->opt_windowsize = 1;
+		  transfer->block = 0;
+		}
 	    }
 	  
-	  if (option_bool(OPT_TFTP_APREF_MAC))
+	  /* cope with backslashes from windows boxen. */
+	  for (p = filename; *p; p++)
+	    if (*p == '\\')
+	      *p = '/';
+	    else if (option_bool(OPT_TFTP_LC))
+	      *p = tolower((unsigned char)*p);
+	  
+	  strcpy(daemon->namebuff, "/");
+	  if (prefix)
 	    {
-	      unsigned char *macaddr = NULL;
-	      unsigned char macbuf[DHCP_CHADDR_MAX];
+	      if (prefix[0] == '/')
+		daemon->namebuff[0] = 0;
+	      strncat(daemon->namebuff, prefix, (MAXDNAME-1) - strlen(daemon->namebuff));
+	      if (prefix[strlen(prefix)-1] != '/')
+		strncat(daemon->namebuff, "/", (MAXDNAME-1) - strlen(daemon->namebuff));
 	      
-#ifdef HAVE_DHCP
-	      if (daemon->dhcp && peer.sa.sa_family == AF_INET)
-	        {
-		  /* Check if the client IP is in our lease database */
-		  struct dhcp_lease *lease = lease_find_by_addr(peer.in.sin_addr);
-		  if (lease && lease->hwaddr_type == ARPHRD_ETHER && lease->hwaddr_len == ETHER_ADDR_LEN)
-		    macaddr = lease->hwaddr;
-		}
-#endif
-	      
-	      /* If no luck, try to find in ARP table. This only works if client is in same (V)LAN */
-	      if (!macaddr && find_mac(&peer, macbuf, 1, now) > 0)
-		macaddr = macbuf;
-	      
-	      if (macaddr)
-	        {
+	      if (option_bool(OPT_TFTP_APREF_IP))
+		{
 		  size_t oldlen = strlen(daemon->namebuff);
 		  struct stat statbuf;
-
-		  snprintf(daemon->namebuff + oldlen, (MAXDNAME-1) - oldlen, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x/",
-			   macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4], macaddr[5]);
+		  
+		  strncat(daemon->namebuff, daemon->addrbuff, (MAXDNAME-1) - strlen(daemon->namebuff));
+		  strncat(daemon->namebuff, "/", (MAXDNAME-1) - strlen(daemon->namebuff));
 		  
 		  /* remove unique-directory if it doesn't exist */
 		  if (stat(daemon->namebuff, &statbuf) == -1 || !S_ISDIR(statbuf.st_mode))
 		    daemon->namebuff[oldlen] = 0;
 		}
+	      
+	      if (option_bool(OPT_TFTP_APREF_MAC))
+		{
+		  unsigned char *macaddr = NULL;
+		  unsigned char macbuf[DHCP_CHADDR_MAX];
+		  
+#ifdef HAVE_DHCP
+		  if (daemon->dhcp && peer.sa.sa_family == AF_INET)
+		    {
+		      /* Check if the client IP is in our lease database */
+		      struct dhcp_lease *lease = lease_find_by_addr(peer.in.sin_addr);
+		      if (lease && lease->hwaddr_type == ARPHRD_ETHER && lease->hwaddr_len == ETHER_ADDR_LEN)
+			macaddr = lease->hwaddr;
+		    }
+#endif
+		  
+		  /* If no luck, try to find in ARP table. This only works if client is in same (V)LAN */
+		  if (!macaddr && find_mac(&peer, macbuf, 1, now) > 0)
+		    macaddr = macbuf;
+		  
+		  if (macaddr)
+		    {
+		      size_t oldlen = strlen(daemon->namebuff);
+		      struct stat statbuf;
+		      
+		      snprintf(daemon->namebuff + oldlen, (MAXDNAME-1) - oldlen, "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x/",
+			       macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4], macaddr[5]);
+		      
+		      /* remove unique-directory if it doesn't exist */
+		      if (stat(daemon->namebuff, &statbuf) == -1 || !S_ISDIR(statbuf.st_mode))
+			daemon->namebuff[oldlen] = 0;
+		    }
+		}
+	      
+	      /* Absolute pathnames OK if they match prefix */
+	      if (filename[0] == '/')
+		{
+		  if (strstr(filename, daemon->namebuff) == filename)
+		    daemon->namebuff[0] = 0;
+		  else
+		    filename++;
+		}
 	    }
+	  else if (filename[0] == '/')
+	    daemon->namebuff[0] = 0;
+	  strncat(daemon->namebuff, filename, (MAXDNAME-1) - strlen(daemon->namebuff));
 	  
-	  /* Absolute pathnames OK if they match prefix */
-	  if (filename[0] == '/')
+	  /* check permissions and open file */
+	  if ((transfer->file = check_tftp_fileperm(&len, prefix, daemon->addrbuff)))
 	    {
-	      if (strstr(filename, daemon->namebuff) == filename)
-		daemon->namebuff[0] = 0;
+	      transfer->lastack = transfer->block;
+	      transfer->retransmit = now + transfer->timeout;
+	      /* This packet is may be the first data packet, but only if windowsize == 1
+		 To get windowsize greater then one requires an option negotiation,
+		 in which case this packet is the OACK. */
+	      if ((len = get_block(packet, transfer)) == -1)
+		len = tftp_err_oops(packet, daemon->namebuff);
 	      else
-		filename++;
+		is_err = 0;
 	    }
 	}
-      else if (filename[0] == '/')
-	daemon->namebuff[0] = 0;
-      strncat(daemon->namebuff, filename, (MAXDNAME-1) - strlen(daemon->namebuff));
-      
-      /* check permissions and open file */
-      if ((transfer->file = check_tftp_fileperm(&len, prefix, daemon->addrbuff)))
-	{
-	  if ((len = get_block(packet, transfer)) == -1)
-	    len = tftp_err_oops(packet, daemon->namebuff);
-	  else
-	    is_err = 0;
-	}
     }
-
-  send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), packet, len, &peer, &addra, if_index);
-
+  
+  if (len)
+    {
+      send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), packet, len, &peer, &addra, if_index);
+      
 #ifdef HAVE_DUMPFILE
-  dump_packet_udp(DUMP_TFTP, (void *)packet, len, NULL, (union mysockaddr *)&peer, transfer->sockfd);
+      dump_packet_udp(DUMP_TFTP, (void *)packet, len, NULL, (union mysockaddr *)&peer, transfer->sockfd);
 #endif
+    }
   
   if (is_err)
     free_transfer(transfer);
@@ -606,6 +637,10 @@ void check_tftp_listeners(time_t now)
 
 	  if ((len = recvfrom(transfer->sockfd, daemon->packet, daemon->packet_buff_sz, 0, &peer.sa, &addr_len)) > 0)
 	    {
+#ifdef HAVE_DUMPFILE
+	      dump_packet_udp(DUMP_TFTP, (void *)daemon->packet, len, (union mysockaddr *)&peer, NULL, transfer->sockfd);
+#endif	      
+
 	      if (sockaddr_isequal(&peer, &transfer->peer)) 
 		handle_tftp(now, transfer, len);
 	      else
@@ -624,66 +659,90 @@ void check_tftp_listeners(time_t now)
 	  
   for (transfer = daemon->tftp_trans, up = &daemon->tftp_trans; transfer; transfer = tmp)
     {
-      tmp = transfer->next;
+      int endcon = 0, error = 0, timeout = 0;
       
-      if (difftime(now, transfer->timeout) >= 0.0)
+      tmp = transfer->next;
+            
+      /* ->start set to zero in handle_tftp() when we recv an error packet. */
+      if (transfer->start == 0)
+	endcon = error = 1;
+      else if (difftime(now, transfer->start) > TFTP_TRANSFER_TIME)  
 	{
-	  int endcon = 0;
+	  endcon = 1;
+	  /* don't complain about timeout when we're awaiting the last
+	     ACK, some clients never send it */
+	  if (get_block(daemon->packet, transfer) > 0)
+	    error = timeout = 1;
+	}
+      else if (difftime(now, transfer->retransmit) >= 0.0)
+	{
+	  /* Do transmission or re-transmission. When we get an ACK, the call to handle_tftp()
+	     bumps transfer->lastack and trips the retransmit timer so that we send the next block(s)
+	     here. */
 	  ssize_t len;
-
-	  /* timeout, retransmit */
-	  transfer->timeout += 1 + (1<<(transfer->backoff/2));
-	  	  
-	  /* we overwrote the buffer... */
-	  daemon->srv_save = NULL;
-
-	  if ((len = get_block(daemon->packet, transfer)) == -1)
-	    {
-	      len = tftp_err_oops(daemon->packet, transfer->file->filename);
-	      endcon = 1;
-	    }
-	  else if (++transfer->backoff > 7)
-	    {
-	      /* don't complain about timeout when we're awaiting the last
-		 ACK, some clients never send it */
-	      if ((unsigned)len == transfer->blocksize + 4)
-		endcon = 1;
-	      len = 0;
-	    }
-
-	  if (len != 0)
-	    {
-	      send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), daemon->packet, len,
-			&transfer->peer, &transfer->source, transfer->if_index);
-#ifdef HAVE_DUMPFILE
-	      dump_packet_udp(DUMP_TFTP, (void *)daemon->packet, len, NULL, (union mysockaddr *)&transfer->peer, transfer->sockfd);
-#endif
-	    }
 	  
-	  if (endcon || len == 0)
+	  transfer->retransmit += transfer->timeout + (1<<(transfer->backoff/2));
+	  transfer->backoff++;
+	  transfer->block = transfer->lastack;
+	  
+	  if ((len = get_block(daemon->packet, transfer)) == 0)
+	    endcon = 1; /* got last ACK */
+	  else
 	    {
-	      strcpy(daemon->namebuff, transfer->file->filename);
-	      sanitise(daemon->namebuff);
-	      (void)prettyprint_addr(&transfer->peer, daemon->addrbuff);
-	      my_syslog(MS_TFTP | LOG_INFO, endcon ? _("failed sending %s to %s") : _("sent %s to %s"), daemon->namebuff, daemon->addrbuff);
-	      /* unlink */
-	      *up = tmp;
-	      if (endcon)
-		free_transfer(transfer);
-	      else
+	      /* send a window'a worth of blocks unless we're retransmitting OACK */
+	      unsigned int i, winsize = transfer->block ? transfer->windowsize : 1;
+	      
+	      for (i = 0; i < winsize && !endcon; i++, transfer->block++)
 		{
-		  /* put on queue to be sent to script and deleted */
-		  transfer->next = daemon->tftp_done_trans;
-		  daemon->tftp_done_trans = transfer;
+		  if (i != 0)
+		    len = get_block(daemon->packet, transfer);
+
+		  if (len == 0)
+		    break;
+		  
+		  if (len == -1)
+		    {
+		      len = tftp_err_oops(daemon->packet, transfer->file->filename);
+		      endcon = error = 1;
+		    }
+		  
+		  send_from(transfer->sockfd, !option_bool(OPT_SINGLE_PORT), daemon->packet, len,
+			    &transfer->peer, &transfer->source, transfer->if_index);
+#ifdef HAVE_DUMPFILE
+		  dump_packet_udp(DUMP_TFTP, (void *)daemon->packet, len, NULL, (union mysockaddr *)&transfer->peer, transfer->sockfd);
+#endif
 		}
-	      continue;
 	    }
 	}
-
-      up = &transfer->next;
-    }    
-}
+	      
+      if (endcon)
+	{
+	  strcpy(daemon->namebuff, transfer->file->filename);
+	  sanitise(daemon->namebuff);
+	  (void)prettyprint_addr(&transfer->peer, daemon->addrbuff);
+	  if (timeout)
+	    my_syslog(MS_TFTP | LOG_ERR, _("timeout sending %s to %s"), daemon->namebuff, daemon->addrbuff);
+	  else if (error)
+	    my_syslog(MS_TFTP | LOG_ERR, _("failed sending %s to %s"), daemon->namebuff, daemon->addrbuff);
+	  else
+	    my_syslog(MS_TFTP | LOG_INFO, _("sent %s to %s"), daemon->namebuff, daemon->addrbuff);
 	  
+	  /* unlink */
+	  *up = tmp;
+	  if (error)
+	    free_transfer(transfer);
+	  else
+	    {
+	      /* put on queue to be sent to script and deleted */
+	      transfer->next = daemon->tftp_done_trans;
+	      daemon->tftp_done_trans = transfer;
+	    }
+	}
+      else
+	up = &transfer->next;
+    }
+}
+
 /* packet in daemon->packet as this is called. */
 static void handle_tftp(time_t now, struct tftp_transfer *transfer, ssize_t len)
 {
@@ -693,13 +752,30 @@ static void handle_tftp(time_t now, struct tftp_transfer *transfer, ssize_t len)
   
   if (len >= (ssize_t)sizeof(struct ack))
     {
-      if (ntohs(mess->op) == OP_ACK && ntohs(mess->block) == (unsigned short)transfer->block) 
+      if (ntohs(mess->op) == OP_ACK)
 	{
-	  /* Got ack, ensure we take the (re)transmit path */
-	  transfer->timeout = now;
-	  transfer->backoff = 0;
-	  if (transfer->block++ != 0)
-	    transfer->offset += transfer->blocksize - transfer->expansion;
+	  /* try and handle 16-bit blockno wrap-around */
+	  unsigned int block = (unsigned short)ntohs(mess->block);
+	  if (block < transfer->lastack)
+	    block |= transfer->block & 0xffff0000;
+	  
+	  /* ignore duplicate ACKs and ACKs for blocks we've not yet sent. */
+	  if (block >= transfer->lastack &&
+	      block <= transfer->block) 
+	    {
+	      /* Got ack, move forward and ensure we take the (re)transmit path */
+	      transfer->retransmit = transfer->start = now;
+	      transfer->backoff = 0;
+	      transfer->lastack = block + 1;
+	      
+	      /* We have no easy function from block no. to file offset when
+		 expanding line breaks in netascii mode, so we update the offset here
+		 as each block is acknowledged. This explains why the window size must be
+		 one for a netascii transfer; to avoid  the block no. doing anything
+		 other than incrementing by one. */
+	      if (transfer->netascii && block != 0)
+		transfer->offset += transfer->blocksize - transfer->expansion;
+	    }
 	}
       else if (ntohs(mess->op) == OP_ERR)
 	{
@@ -720,8 +796,7 @@ static void handle_tftp(time_t now, struct tftp_transfer *transfer, ssize_t len)
 		    daemon->addrbuff);	
 	  
 	  /* Got err, ensure we take abort */
-	  transfer->timeout = now;
-	  transfer->backoff = 100;
+	  transfer->start = 0;
 	}
     }
 }
@@ -755,14 +830,22 @@ static char *next(char **p, char *end)
   return ret;
 }
 
+/* If we don't do anything, don't write the the input/ouptut
+   buffer. This allows us to pass in safe read-only strings constants. */
 static void sanitise(char *buf)
 {
   unsigned char *q, *r;
+
   for (q = r = (unsigned char *)buf; *r; r++)
     if (isprint((int)*r))
-      *(q++) = *r;
-  *q = 0;
-
+      {
+	if (q != r)
+	  *q = *r;
+	q++;
+      }
+  
+  if (q != r)
+    *q = 0;
 }
 
 #define MAXMESSAGE 500 /* limit to make packet < 512 bytes and definitely smaller than buffer */ 
@@ -773,7 +856,10 @@ static ssize_t tftp_err(int err, char *packet, char *message, char *file, char *
     char message[];
   } *mess = (struct errmess *)packet;
   ssize_t len, ret = 4;
-    
+
+  /* we overwrote the buffer... */
+  daemon->srv_save = NULL;
+
   memset(packet, 0, daemon->packet_buff_sz);
   if (file)
     sanitise(file);
@@ -801,7 +887,10 @@ static ssize_t tftp_err_oops(char *packet, const char *file)
 static ssize_t get_block(char *packet, struct tftp_transfer *transfer)
 {
   memset(packet, 0, daemon->packet_buff_sz);
-  
+
+  /* we overwrote the buffer... */
+  daemon->srv_save = NULL;
+
   if (transfer->block == 0)
     {
       /* send OACK */
@@ -823,7 +912,17 @@ static ssize_t get_block(char *packet, struct tftp_transfer *transfer)
 	  p += (sprintf(p,"tsize") + 1);
 	  p += (sprintf(p, "%u", (unsigned int)transfer->file->size) + 1);
 	}
-
+      if (transfer->opt_timeout)
+	{
+	  p += (sprintf(p,"timeout") + 1);
+	  p += (sprintf(p, "%u", transfer->timeout) + 1);
+	}
+      if (transfer->opt_windowsize)
+	{
+	  p += (sprintf(p,"windowsize") + 1);
+	  p += (sprintf(p, "%u", (unsigned int)transfer->windowsize) + 1);
+	}
+ 
       return p - packet;
     }
   else
@@ -834,31 +933,35 @@ static ssize_t get_block(char *packet, struct tftp_transfer *transfer)
 	unsigned char data[];
       } *mess = (struct datamess *)packet;
       
-      size_t size = transfer->file->size - transfer->offset; 
+      size_t size;
+      
+      if (!transfer->netascii)
+	transfer->offset = (transfer->block - 1) * transfer->blocksize;
       
       if (transfer->offset > transfer->file->size)
 	return 0; /* finished */
       
-      if (size > transfer->blocksize)
+      if ((size = transfer->file->size - transfer->offset) > transfer->blocksize)
 	size = transfer->blocksize;
       
       mess->op = htons(OP_DATA);
       mess->block = htons((unsigned short)(transfer->block));
-      
-      if (lseek(transfer->file->fd, transfer->offset, SEEK_SET) == (off_t)-1 ||
-	  !read_write(transfer->file->fd, mess->data, size, RW_READ))
+
+      if (size != 0 &&
+	  (lseek(transfer->file->fd, transfer->offset, SEEK_SET) == (off_t)-1 ||
+	   !read_write(transfer->file->fd, mess->data, size, RW_READ)))
 	return -1;
       
-      transfer->expansion = 0;
-      
       /* Map '\n' to CR-LF in netascii mode */
       if (transfer->netascii)
 	{
 	  size_t i;
 	  int newcarrylf;
-
+	  
+	  transfer->expansion = 0;
+	  
 	  for (i = 0, newcarrylf = 0; i < size; i++)
-	    if (mess->data[i] == '\n' && ( i != 0 || !transfer->carrylf))
+	    if (mess->data[i] == '\n' && (i != 0 || !transfer->carrylf))
 	      {
 		transfer->expansion++;
 
@@ -873,8 +976,8 @@ static ssize_t get_block(char *packet, struct tftp_transfer *transfer)
 		
 		i++;
 	      }
+
 	  transfer->carrylf = newcarrylf;
-	  
 	}
 
       return size + 4;

src/ubus.c

@@ -213,6 +213,11 @@ static int ubus_handle_set_connmark_allowlist(struct ubus_context *ctx, struct u
   size_t num_patterns = 0;
   struct blob_attr *tb[policy_len];
   struct blob_attr *attr;
+
+  (void)ctx;
+  (void)obj;
+  (void)req;
+  (void)method;
   
   if (blobmsg_parse(policy, policy_len, tb, blob_data(msg), blob_len(msg)))
     return UBUS_STATUS_INVALID_ARGUMENT;