Supply zero preference in advertise and reply messages

which have IAADDR options. This communicates zero information and
RFC3315 is unclear that it's needed, but at least one client seems
to require it.

CHANGELOG

@@ -1,3 +1,15 @@
+version 2.61
+	    Re-write interface discovery code on *BSD to use
+	    getifaddrs. This is more portable, more straightforward,
+	    and allows us to find the prefix length for IPv6
+	    addresses.
+
+	    Add ra-names DHCPv6 keyword which adds AAAA records
+	    for dual-stack hosts which get IPv6 addresses via SLAAC.
+
+	    Add --dhcp-duid to allow DUID-EN uids to be used.
+
+
 version 2.60
             Fix compilation problem in Mac OS X Lion. Thanks to Olaf
             Flebbe for the patch.

debian/changelog

@@ -1,3 +1,11 @@
+dnsmasq (2.61-1) unstable; urgency=low
+
+   * New upstream.
+   * Provide "dump-stats" initscript method. (closes: #654656)
+   * Add (empty) build-indep and build-arch rules targets.
+
+ -- Simon Kelley <simon@thekelleys.org.uk>  Tue, 6 Mar 2012 19:45:43 +0000
+
 dnsmasq (2.60-1) unstable; urgency=low
 
    * New upstream.

debian/init

@@ -256,8 +256,11 @@ case "$1" in
 		*) log_success_msg "(unknown)" ; exit 4 ;;
 	esac
 	;;
+  dump-stats)
+        kill -s USR1 `cat /var/run/dnsmasq/$NAME.pid`
+	;;
   *)
-	echo "Usage: /etc/init.d/$NAME {start|stop|restart|force-reload|status}" >&2
+	echo "Usage: /etc/init.d/$NAME {start|stop|restart|force-reload|dump-stats|status}" >&2
 	exit 3
 	;;
 esac

debian/rules

@@ -184,7 +184,10 @@ endef
 # Below here is fairly generic really
 
 binary:		binary-arch binary-indep
+
 build:		
+build-arch:
+build-indep:
 
 checkroot:
 	test root = "`whoami`"

dnsmasq.conf.example

@@ -164,6 +164,15 @@
 # Do Router Advertisements, BUT NOT DHCP for this subnet.
 #dhcp-range=1234::, ra-only 
 
+# Do Router Advertisements, BUT NOT DHCP for this subnet, also try and
+# add names to the DNS for the IPv6 address of SLAAC-configured dual-stack 
+# hosts. Use the DHCPv4 lease to derive the name, network segment and 
+# MAC address and assume that the host will also have an
+# IPv6 address calculated using the SLAAC alogrithm.
+# This will generate an erroneous AAAA record if a host is using privacy 
+# extensions or does not support IPv6. Use with care.
+#dhcp-range=1234::, ra-names
+
 # Do Router Advertisements, BUT NOT DHCP for this subnet.
 # Set the lifetime to 46 hours. (Note: minimum lifetime is 2 hours.)
 #dhcp-range=1234::, ra-only, 48h

man/dnsmasq.8

@@ -23,7 +23,7 @@ options. It includes a secure, read-only,
 TFTP server to allow net/PXE boot of DHCP hosts and also supports BOOTP.
 .PP
 Dnsmasq 
-supports IPv6 for DNS and TFTP, but not DHCP.
+supports IPv6 for all functions and a minimal router-advertisemnet daemon.
 .SH OPTIONS
 Note that in general missing parameters are allowed and switch off
 functions, for instance "--pid-file" disables writing a PID file. On
@@ -556,7 +556,18 @@ the keyword
 which tells dnsmasq to offer Router Advertisement only on this subnet,
 and not DHCP. This applies to IPv6 only, see
 .B enable-ra
-for details.
+for details. Instead, the keyword
+.B ra-names
+may be used. This does the same at ra-only, but also enables a mode
+which gives DNS names to dual-stack hosts which do SLAAC for
+IPv6. Dnsmasq uses the hosts IPv4 lease to derive the name, network
+segment and MAC address and assumes that the host will also have an
+IPv6 address calculated using the SLAAC alogrithm, on the same network
+segment. An AAAA record is added to the DNS for this IPv6
+address. Note that this is only happens for directly-connected
+networks, (not one doing DHCP via a relay) and it will generate an
+erroneous AAAA record if a host is using privacy extensions or does
+not support IPv6. Use with care.
 
 The interface:<interface name> section is not normally used. See the
 NOTES section for details of this.
@@ -1031,6 +1042,16 @@ the tags used to determine them.
 .B \-l, --dhcp-leasefile=<path>
 Use the specified file to store DHCP lease information.
 .TP 
+.B --dhcp-duid=<enterprise-id>,<uid>
+(IPv6 only) Specify the server persistent UID which the DHCPv6 server
+will use. This option is not normally required as dnsmasq creates a
+DUID automatically when it is first needed. When given, this option
+provides dnsmasq the data required to create a DUID-EN type DUID. Note
+that once set, the DUID is stored in the lease database, so to change between DUID-EN and
+automatically created DUIDs or vice-versa, the lease database must be
+re-intialised. The enterprise-id is assigned by IANA, and the uid is a
+string of hex octets unique to a particular device.
+.TP
 .B \-6 --dhcp-script=<path>
 Whenever a new DHCP lease is created, or an old one destroyed, the
 executable specified by this option is run.  <path>

src/bpf.c

@@ -17,19 +17,9 @@
 #include "dnsmasq.h"
 
 #if defined(HAVE_BSD_NETWORK) || defined(HAVE_SOLARIS_NETWORK)
-
-static struct iovec ifconf = {
-  .iov_base = NULL,
-  .iov_len = 0
-};
-
-static struct iovec ifreq = {
-  .iov_base = NULL,
-  .iov_len = 0
-};
+#include <ifaddrs.h>
 
 #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
-
 #include <sys/sysctl.h>
 #include <net/route.h>
 #include <net/if_dl.h>
@@ -50,8 +40,12 @@ int arp_enumerate(void *parm, int (*callback)())
   struct rt_msghdr *rtm;
   struct sockaddr_inarp *sin2;
   struct sockaddr_dl *sdl;
+  struct iovec buff;
   int rc;
-  
+
+  buff.iov_base = NULL;
+  buff.iov_len = 0;
+
   mib[0] = CTL_NET;
   mib[1] = PF_ROUTE;
   mib[2] = 0;
@@ -67,9 +61,9 @@ int arp_enumerate(void *parm, int (*callback)())
 
   while (1) 
     {
-      if (!expand_buf(&ifconf, needed))
+      if (!expand_buf(&buff, needed))
 	return 0;
-      if ((rc = sysctl(mib, 6, ifconf.iov_base, &needed, NULL, 0)) == 0 ||
+      if ((rc = sysctl(mib, 6, buff.iov_base, &needed, NULL, 0)) == 0 ||
 	  errno != ENOMEM)
 	break;
       needed += needed / 8;
@@ -77,7 +71,7 @@ int arp_enumerate(void *parm, int (*callback)())
   if (rc == -1)
     return 0;
   
-  for (next = ifconf.iov_base ; next < (char *)ifconf.iov_base + needed; next += rtm->rtm_msglen)
+  for (next = buff.iov_base ; next < (char *)buff.iov_base + needed; next += rtm->rtm_msglen)
     {
       rtm = (struct rt_msghdr *)next;
       sin2 = (struct sockaddr_inarp *)(rtm + 1);
@@ -88,19 +82,14 @@ int arp_enumerate(void *parm, int (*callback)())
 
   return 1;
 }
-
 #endif
 
 
 int iface_enumerate(int family, void *parm, int (*callback)())
 {
-  char *ptr;
-  struct ifreq *ifr;
-  struct ifconf ifc;
-  int fd, errsav, ret = 0;
-  int lastlen = 0;
-  size_t len = 0;
-  
+  struct ifaddrs *head, *addrs;
+  int errsav, ret = 0;
+
   if (family == AF_UNSPEC)
 #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
     return  arp_enumerate(parm, callback);
@@ -112,95 +101,62 @@ int iface_enumerate(int family, void *parm, int (*callback)())
   if (family == AF_LOCAL)
     family = AF_LINK;
 
-  if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
+  if (getifaddrs(&head) == -1)
     return 0;
-  
-  while(1)
-    {
-      len += 10*sizeof(struct ifreq);
-      
-      if (!expand_buf(&ifconf, len))
-	goto err;
-      
-      ifc.ifc_len = len;
-      ifc.ifc_buf = ifconf.iov_base;
-      
-      if (ioctl(fd, SIOCGIFCONF, &ifc) == -1)
-	{
-	  if (errno != EINVAL || lastlen != 0)
-	    goto err;
-	}
-      else
-	{
-	  if (ifc.ifc_len == lastlen)
-	    break; /* got a big enough buffer now */
-	  lastlen = ifc.ifc_len;
-	}
-    }
-  
-  for (ptr = ifc.ifc_buf; ptr < (char *)(ifc.ifc_buf + ifc.ifc_len); ptr += len)
-    {
-      /* subsequent entries may not be aligned, so copy into
-	 an aligned buffer to avoid nasty complaints about 
-	 unaligned accesses. */
 
-      len = sizeof(struct ifreq);
-      
-#ifdef HAVE_SOCKADDR_SA_LEN
-      ifr = (struct ifreq *)ptr;
-      if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_ifru))
-	len = ifr->ifr_addr.sa_len + offsetof(struct ifreq, ifr_ifru);
-#endif
-      
-      if (!expand_buf(&ifreq, len))
-	goto err;
-
-      ifr = (struct ifreq *)ifreq.iov_base;
-      memcpy(ifr, ptr, len);
-      
-      if (ifr->ifr_addr.sa_family == family)
+  for (addrs = head; addrs; addrs = addrs->ifa_next)
+    {
+      if (addrs->ifa_addr->sa_family == family)
 	{
+	  int iface_index = if_nametoindex(addrs->ifa_name);
+
+	  if (iface_index == 0)
+	    continue;
+
 	  if (family == AF_INET)
 	    {
 	      struct in_addr addr, netmask, broadcast;
-	      broadcast.s_addr = 0;
-	      addr = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
-	      if (ioctl(fd, SIOCGIFNETMASK, ifr) == -1)
-		continue;
-	      netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
-	      if (ioctl(fd, SIOCGIFBRDADDR, ifr) != -1)
-		broadcast = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr; 
-	      if (!((*callback)(addr, 
-				(int)if_nametoindex(ifr->ifr_name),
-				netmask, broadcast, 
-				parm)))
+	      addr = ((struct sockaddr_in *) addrs->ifa_addr)->sin_addr;
+	      netmask = ((struct sockaddr_in *) addrs->ifa_netmask)->sin_addr;
+	      broadcast = ((struct sockaddr_in *) addrs->ifa_broadaddr)->sin_addr; 
+	      if (!((*callback)(addr, iface_index, netmask, broadcast, parm)))
 		goto err;
 	    }
 #ifdef HAVE_IPV6
 	  else if (family == AF_INET6)
 	    {
-	      struct in6_addr *addr = &((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_addr;
+	      struct in6_addr *addr = &((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_addr;
+	      unsigned char *netmask = (unsigned char *) &((struct sockaddr_in6 *) addrs->ifa_netmask)->sin6_addr;
+	      int scope_id = ((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_scope_id;
+	      int i, j, prefix = 0;
+	      
+	      for (i = 0; i < IN6ADDRSZ; i++, prefix += 8) 
+                if (netmask[i] != 0xff)
+		  break;
+       
+	      if (i != IN6ADDRSZ && netmask[i]) 
+                for (j = 7; j > 0; j--, prefix++) 
+		  if ((netmask[i] & (1 << j)) == 0)
+		    break;
+	      
 	      /* voodoo to clear interface field in address */
 	      if (!option_bool(OPT_NOWILD) && IN6_IS_ADDR_LINKLOCAL(addr))
 		{
 		  addr->s6_addr[2] = 0;
 		  addr->s6_addr[3] = 0;
 		}
-	       /* We have no way to determine the prefix, so we assume it's 64 for now....... */
-	      if (!((*callback)(addr, 64,
-				(int)((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_scope_id,
-				(int)if_nametoindex(ifr->ifr_name), 0, 
-				parm)))
+	      
+	      if (!((*callback)(addr, prefix, scope_id, iface_index, 0, parm)))
 		goto err;
-	    }
+	}
 #endif
 #ifdef HAVE_DHCP6      
 	  else if (family == AF_LINK)
 	    { 
 	      /* Assume ethernet again here */
-	      struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
-	      if (sdl->sdl_alen != 0 && !((*callback)((int)if_nametoindex(ifr->ifr_name),
-						      ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, parm)))
+	      struct sockaddr_dl *sdl = (struct sockaddr_dl *) addrs->ifa_addr;
+	      if (sdl->sdl_alen != 0 && 
+		  !((*callback)(iface_index, ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, parm)))
 		goto err;
 	    }
 #endif 
@@ -211,7 +167,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 
  err:
   errsav = errno;
-  close(fd);  
+  freeifaddrs(head);  
   errno = errsav;
 
   return ret;
@@ -228,13 +184,10 @@ void init_bpf(void)
 
   while (1) 
     {
-      /* useful size which happens to be sufficient */
-      if (expand_buf(&ifreq, sizeof(struct ifreq)))
-	{
-	  sprintf(ifreq.iov_base, "/dev/bpf%d", i++);
-	  if ((daemon->dhcp_raw_fd = open(ifreq.iov_base, O_RDWR, 0)) != -1)
-	    return;
-	}
+      sprintf(daemon->dhcp_buff, "/dev/bpf%d", i++);
+      if ((daemon->dhcp_raw_fd = open(daemon->dhcp_buff, O_RDWR, 0)) != -1)
+	return;
+
       if (errno != EBUSY)
 	die(_("cannot create DHCP BPF socket: %s"), NULL, EC_BADNET);
     }	     

src/dbus.c

@@ -396,7 +396,7 @@ void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname)
   DBusConnection *connection = (DBusConnection *)daemon->dbus;
   DBusMessage* message = NULL;
   DBusMessageIter args;
-  char *action_str, *addr, *mac = daemon->namebuff;
+  char *action_str, *mac = daemon->namebuff;
   unsigned char *p;
   int i;
 
@@ -406,10 +406,21 @@ void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname)
   if (!hostname)
     hostname = "";
   
-  p = extended_hwaddr(lease->hwaddr_type, lease->hwaddr_len,
-		      lease->hwaddr, lease->clid_len, lease->clid, &i);
-  print_mac(mac, p, i);
-  
+#ifdef HAVE_DHCP6
+   if (lease->flags & (LEASE_TA | LEASE_NA))
+     {
+       print_mac(mac, lease->clid, lease->clid_len);
+       inet_ntop(AF_INET6, lease->hwaddr, daemon->addrbuff, ADDRSTRLEN);
+     }
+   else
+#endif
+     {
+       p = extended_hwaddr(lease->hwaddr_type, lease->hwaddr_len,
+			   lease->hwaddr, lease->clid_len, lease->clid, &i);
+       print_mac(mac, p, i);
+       inet_ntop(AF_INET, &lease->addr, daemon->addrbuff, ADDRSTRLEN);
+     }
+
   if (action == ACTION_DEL)
     action_str = "DhcpLeaseDeleted";
   else if (action == ACTION_ADD)
@@ -419,14 +430,12 @@ void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname)
   else
     return;
 
-  addr = inet_ntoa(lease->addr);
-
   if (!(message = dbus_message_new_signal(DNSMASQ_PATH, DNSMASQ_SERVICE, action_str)))
     return;
   
   dbus_message_iter_init_append(message, &args);
-
-  if (dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &addr) &&
+  
+  if (dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &daemon->addrbuff) &&
       dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &mac) &&
       dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &hostname))
     dbus_connection_send(connection, message, NULL);

src/dhcp6.c

@@ -365,13 +365,26 @@ struct dhcp_config *find_config6(struct dhcp_config *configs,
 
 void make_duid(time_t now)
 {
-  /* rebase epoch to 1/1/2000 */
-  time_t newnow = now - 946684800;
-  
-  iface_enumerate(AF_LOCAL, &newnow, make_duid1);
-  
-  if(!daemon->duid)
-    die("Cannot create DHCPv6 server DUID: %s", NULL, EC_MISC);
+  if (daemon->duid_config)
+    {
+      unsigned char *p;
+      
+      daemon->duid = p = safe_malloc(daemon->duid_config_len + 6);
+      daemon->duid_len = daemon->duid_config_len + 6;
+      PUTSHORT(2, p); /* DUID_EN */
+      PUTLONG(daemon->duid_enterprise, p);
+      memcpy(p, daemon->duid_config, daemon->duid_config_len);
+    }
+  else
+    {
+      /* rebase epoch to 1/1/2000 */
+      time_t newnow = now - 946684800;
+      
+      iface_enumerate(AF_LOCAL, &newnow, make_duid1);
+      
+      if(!daemon->duid)
+	die("Cannot create DHCPv6 server DUID: %s", NULL, EC_MISC);
+    }
 }
 
 static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm)

src/dnsmasq.c

@@ -106,16 +106,14 @@ int main (int argc, char **argv)
     else
       open("/dev/null", O_RDWR); 
 
-#ifdef HAVE_LINUX_NETWORK
-  netlink_init();
-#elif !(defined(IP_RECVDSTADDR) && \
-	defined(IP_RECVIF) && \
-	defined(IP_SENDSRCADDR))
+#ifndef HAVE_LINUX_NETWORK
+#  if !(defined(IP_RECVDSTADDR) && defined(IP_RECVIF) && defined(IP_SENDSRCADDR))
   if (!option_bool(OPT_NOWILD))
     {
       bind_fallback = 1;
       set_option_bool(OPT_NOWILD);
     }
+#  endif
 #endif
 
 #ifndef HAVE_TFTP
@@ -180,10 +178,25 @@ int main (int argc, char **argv)
   if (daemon->dhcp6)
     dhcp6_init();
 
-  if (daemon->ra_contexts || daemon->dhcp6)
-    join_multicast();
 #  endif
 
+#endif
+
+#ifdef HAVE_LINUX_NETWORK
+  /* After lease_init */
+  netlink_init();
+#endif
+
+#ifdef HAVE_DHCP6
+  /* after netlink_init */
+  if (daemon->ra_contexts || daemon->dhcp6)
+    join_multicast();
+#endif
+
+#ifdef HAVE_DHCP
+  /* after netlink_init */
+  if (daemon->dhcp || daemon->dhcp6)
+    lease_find_interfaces(now);
 #endif
 
   if (!enumerate_interfaces())
@@ -552,6 +565,8 @@ int main (int argc, char **argv)
 	  my_syslog(MS_DHCP | LOG_INFO, 
 		    (dhcp_tmp->flags & CONTEXT_STATIC) ? 
 		    _("DHCP, static leases only on %.0s%s, lease time %s") :
+		    (dhcp_tmp->flags & CONTEXT_RA_NAME) ? 
+		    _("router advertisement with DHCPv4-derived names on %.0s%s, lifetime %s") :
 		    (dhcp_tmp->flags & CONTEXT_RA_ONLY) ? 
 		    _("router advertisement only on %.0s%s, lifetime %s") :
 		    (dhcp_tmp->flags & CONTEXT_PROXY) ?

src/dnsmasq.h

@@ -621,6 +621,7 @@ struct dhcp_context {
 #define CONTEXT_PROXY     8
 #define CONTEXT_RA_ONLY  16
 #define CONTEXT_RA_DONE  32
+#define CONTEXT_RA_NAME  64
 
 struct ping_result {
   struct in_addr addr;
@@ -629,6 +630,13 @@ struct ping_result {
   struct ping_result *next;
 };
 
+struct subnet_map {
+  int iface;
+  struct in6_addr subnet;
+  struct subnet_map *next;
+};
+  
+  
 struct tftp_file {
   int refcount, fd;
   off_t size;
@@ -723,6 +731,8 @@ extern struct daemon {
   struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */
   struct interface_list *tftp_interfaces; /* interfaces for limited TFTP service */
   int tftp_unlimited;
+  unsigned int duid_enterprise, duid_config_len;
+  unsigned char *duid_config;
 
   /* globally used stuff for DNS */
   char *packet; /* packet buffer */
@@ -948,6 +958,7 @@ void lease_prune(struct dhcp_lease *target, time_t now);
 void lease_update_from_configs(void);
 int do_script_run(time_t now);
 void rerun_scripts(void);
+void lease_find_interfaces(time_t now);
 #ifdef HAVE_SCRIPT
 void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data, 
 			 unsigned int len, int delim);
@@ -1083,4 +1094,5 @@ void ra_init(time_t now);
 void icmp6_packet(void);
 time_t periodic_ra(time_t now);
 void ra_start_unsolicted(time_t now);
+struct subnet_map *build_subnet_map(void);
 #endif

src/lease.c

@@ -175,16 +175,6 @@ void lease_init(time_t now)
   file_dirty = 0;
   lease_prune(NULL, now);
   dns_dirty = 1;
-
-#ifdef HAVE_DHCP6  
-  /* If we're not doing DHCPv6, and there are not v6 leases, don't add the DUID to the database */
-  if (!daemon->duid && daemon->dhcp6)
-    {
-      file_dirty = 1;
-      make_duid(now);
-    }
-#endif
-
 }
 
 void lease_update_from_configs(void)
@@ -340,20 +330,122 @@ void lease_update_file(time_t now)
     alarm((unsigned)difftime(next_event, now)); 
 }
 
-void lease_update_dns(void)
+
+static int find_interface_v4(struct in_addr local, int if_index, 
+			     struct in_addr netmask, struct in_addr broadcast, void *vparam)
 {
   struct dhcp_lease *lease;
   
+  (void) broadcast;
+  (void) vparam;
+
+  for (lease = leases; lease; lease = lease->next)
+    if (!(lease->flags & (LEASE_TA | LEASE_NA)))
+      if (is_same_net(local, lease->addr, netmask))
+	lease->last_interface = if_index;
+  
+  return 1;
+}
+
+#ifdef HAVE_DHCP6
+static int find_interface_v6(struct in6_addr *local,  int prefix,
+			     int scope, int if_index, int dad, void *vparam)
+{
+  struct dhcp_lease *lease;
+  
+  (void) scope;
+  (void) vparam;
+  (void)dad;
+
+  for (lease = leases; lease; lease = lease->next)
+    if ((lease->flags & (LEASE_TA | LEASE_NA)))
+      if (is_same_net6(local, (struct in6_addr *)&lease->hwaddr, prefix))
+	lease->last_interface = if_index;
+  
+  return 1;
+}
+#endif
+
+
+/* Find interfaces associated with leases at start-up. This gets updated as
+   we do DHCP transactions, but information about directly-connected subnets
+   is useful from scrips and necessary for determining SLAAC addresses from
+   start-time. */
+void lease_find_interfaces(time_t now)
+{
+  iface_enumerate(AF_INET, NULL, find_interface_v4);
+#ifdef HAVE_DHCP6
+  iface_enumerate(AF_INET6, NULL, find_interface_v6);
+
+  /* If we're not doing DHCPv6, and there are not v6 leases, don't add the DUID to the database */
+  if (!daemon->duid && daemon->dhcp6)
+    {
+      file_dirty = 1;
+      make_duid(now);
+    }
+#endif
+}
+
+
+
+void lease_update_dns(void)
+{
+  struct dhcp_lease *lease;
+
   if (daemon->port != 0 && dns_dirty)
     {
-      cache_unhash_dhcp();
+#ifdef HAVE_DHCP6     
+      struct subnet_map *subnets = build_subnet_map();
+#endif
       
+      cache_unhash_dhcp();
+
       for (lease = leases; lease; lease = lease->next)
 	{
 	  int prot = AF_INET;
+	  
 #ifdef HAVE_DHCP6
 	  if (lease->flags & (LEASE_TA | LEASE_NA))
 	    prot = AF_INET6;
+	  else if (lease->hostname || lease->fqdn)
+	    {
+	      struct subnet_map *map;
+	      for (map = subnets; map; map = map->next)
+		if (lease->last_interface == map->iface)
+		  {
+		    struct in6_addr addr = map->subnet;
+		    if (lease->hwaddr_len == 6 &&
+			(lease->hwaddr_type == ARPHRD_ETHER || lease->hwaddr_type == ARPHRD_IEEE802))
+		      {
+			/* convert MAC address to EUI-64 */
+			memcpy(&addr.s6_addr[8], lease->hwaddr, 3);
+			memcpy(&addr.s6_addr[13], &lease->hwaddr[3], 3);
+			addr.s6_addr[11] = 0xff;
+			addr.s6_addr[12] = 0xfe;
+		      }
+#if defined(ARPHRD_EUI64)
+		    else if (lease->hwaddr_len == 8 &&
+			     lease->hwaddr_type == ARPHRD_EUI64)
+		      memcpy(&addr.s6_addr[8], lease->hwaddr, 8);
+#endif
+#if defined(ARPHRD_IEEE1394) && defined(ARPHRD_EUI64)
+		    else if (lease->clid_len == 9 && 
+			     lease->clid[0] ==  ARPHRD_EUI64 &&
+			     lease->hwaddr_type == ARPHRD_IEEE1394)
+		      /* firewire has EUI-64 identifier as clid */
+		      memcpy(&addr.s6_addr[8], &lease->clid[1], 8);
+#endif
+		    else
+		      continue;
+		    	
+		    addr.s6_addr[8] ^= 0x02;
+		    
+		    if (lease->fqdn)
+		      cache_add_dhcp_entry(lease->fqdn, AF_INET6, (struct all_addr *)&addr, lease->expires);
+		    if (!option_bool(OPT_DHCP_FQDN) && lease->hostname)
+		      cache_add_dhcp_entry(lease->hostname, AF_INET6, (struct all_addr *)&addr, lease->expires);
+		  }
+	    }
 #endif
 	  
 	  if (lease->fqdn)

src/option.c

@@ -115,6 +115,7 @@ struct myoption {
 #define LOPT_FQDN      304
 #define LOPT_LUASCRIPT 305
 #define LOPT_RA        306
+#define LOPT_DUID      307
 
 #ifdef HAVE_GETOPT_LONG
 static const struct option opts[] =  
@@ -235,6 +236,7 @@ static const struct myoption opts[] =
     { "dhcp-client-update", 0, 0, LOPT_FQDN },
     { "dhcp-luascript", 1, 0, LOPT_LUASCRIPT },
     { "enable-ra", 0, 0, LOPT_RA },
+    { "dhcp-duid", 1, 0, LOPT_DUID },
     { NULL, 0, 0, 0 }
   };
 
@@ -362,6 +364,7 @@ static struct {
   { LOPT_CONNTRACK, OPT_CONNTRACK, NULL, gettext_noop("Copy connection-track mark from queries to upstream connections."), NULL },
   { LOPT_FQDN, OPT_FQDN_UPDATE, NULL, gettext_noop("Allow DHCP clients to do their own DDNS updates."), NULL },
   { LOPT_RA, OPT_RA, NULL, gettext_noop("Send router-advertisements for interfaces doing DHCPv6"), NULL },
+  { LOPT_DUID, ARG_ONE, "<enterprise>,<duid>", gettext_noop("Specify DUID_EN-type DHCPv6 server DUID"), NULL },
   { 0, 0, NULL, NULL, NULL }
 }; 
 
@@ -577,7 +580,7 @@ char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len,
 	break;
       }
 
-  if (buf && (!ot[o].name || nodecode))
+  if (opt_len != 0 && buf && (!ot[o].name || nodecode))
     {
       int trunc  = 0;
       if (opt_len > 13)
@@ -2345,6 +2348,11 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 		memcpy(&new->end6, &new->start6, IN6ADDRSZ);
 		new->flags |= CONTEXT_RA_ONLY;
 	      }
+	    else if (strcmp(a[1], "ra-names") == 0)
+	      {
+		memcpy(&new->end6, &new->start6, IN6ADDRSZ);
+		new->flags |= CONTEXT_RA_NAME | CONTEXT_RA_ONLY;
+	      }
 	    else if (!inet_pton(AF_INET6, a[1], &new->end6))
 	      option = '?';
 	    
@@ -2370,7 +2378,9 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 		  {
 		    new->prefix = pref;
 		    leasepos = 3;
-		    if (new->prefix < 64)
+		    if ((new->flags & CONTEXT_RA_ONLY) && new->prefix != 64)
+		      problem = _("prefix must be exactly 64 for RA subnets");
+		    else if (new->prefix < 64)
 		      problem = _("prefix must be at least 64");
 		  }
 	      }
@@ -3040,6 +3050,19 @@ static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
       break;
 #endif
       
+#ifdef HAVE_DHCP6
+    case LOPT_DUID: /* --dhcp-duid */
+      if (!(comma = split(arg)) || !atoi_check(arg, (int *)&daemon->duid_enterprise))
+	problem = _("bad DUID");
+      else
+	{
+	  daemon->duid_config_len = parse_hex(comma,(unsigned char *)comma, strlen(comma), NULL, NULL);
+	  daemon->duid_config = opt_malloc(daemon->duid_config_len);
+	  memcpy(daemon->duid_config, comma, daemon->duid_config_len);
+	}
+      break;
+#endif
+
     case 'V':  /* --alias */
       {
 	char *dash, *a[3] = { NULL, NULL, NULL };

src/radv.c

@@ -426,4 +426,73 @@ static int iface_search(struct in6_addr *local,  int prefix,
   return 1; /* keep searching */
 }
 
+static int add_subnet(struct in6_addr *local,  int prefix,
+		      int scope, int if_index, int dad, void *vparam)
+{ 
+  struct dhcp_context *context;
+  struct subnet_map **subnets = vparam;
+  struct subnet_map *map;
+
+  (void)scope;
+  (void)dad;
+
+  for (context = daemon->ra_contexts; context; context = context->next)
+    if ((context->flags & CONTEXT_RA_NAME) &&
+	prefix == context->prefix &&
+	is_same_net6(local, &context->start6, prefix) &&
+	is_same_net6(local, &context->end6, prefix))
+      {
+	for (map = *subnets; map; map = map->next)
+	  if (map->iface == 0 ||
+	      (map->iface == if_index && is_same_net6(local, &map->subnet, prefix)))
+	    break;
+	
+	/* It's there already */
+	if (map && map->iface != 0)
+	  continue;
+	
+	if (!map && (map = whine_malloc(sizeof(struct subnet_map))))
+	  {
+	    map->next = *subnets;
+	    *subnets = map;
+	  }
+	
+	if (map)
+	  {
+	    map->iface = if_index;
+	    map->subnet = *local;
+	  }
+      }
+
+  return 1;
+}
+
+/* Build a map from ra-names subnets to corresponding interfaces. This
+   is used to go from DHCPv4 leases to SLAAC addresses, 
+   interface->IPv6-subnet, IPv6-subnet + MAC address -> SLAAC.
+*/	      
+struct subnet_map *build_subnet_map(void)
+{
+  struct subnet_map *map;
+  struct dhcp_context *context;
+  static struct subnet_map *subnets = NULL;
+ 
+  for (context = daemon->ra_contexts; context; context = context->next)
+    if ((context->flags & CONTEXT_RA_NAME))
+      break;
+
+  /* no ra-names, no need to go further. */
+  if (!context)
+    return NULL;
+  
+  /* mark unused */
+  for (map = subnets; map; map = map->next)
+    map->iface = 0;
+
+  if (iface_enumerate(AF_INET6, &subnets, add_subnet))
+    return subnets;
+  
+  return NULL;
+}
+
 #endif

src/rfc3315.c

@@ -737,6 +737,11 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 		  {
 		    if (address_assigned) 
 		      {
+			o1 = new_opt6(OPTION6_STATUS_CODE);
+			put_opt6_short(DHCP6SUCCESS);
+			put_opt6_string("Oh hai from dnsmasq");
+			end_opt6(o1);
+			
 			if (ia_type == OPTION6_IA_NA)
 			  {
 			    /* go back an fill in fields in IA_NA option */
@@ -750,7 +755,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 		      }
 		    else
 		      { 
-			/* no address, return erro */
+			/* no address, return error */
 			o1 = new_opt6(OPTION6_STATUS_CODE);
 			put_opt6_short(DHCP6NOADDRS);
 			put_opt6_string("No addresses available");
@@ -758,7 +763,11 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
 		      }
 		    
 		    end_opt6(o);
-		    
+		    	
+		    o = new_opt6(OPTION6_PREFERENCE);
+		    put_opt6_char(0);
+		    end_opt6(o);
+
 		    break;
 		  }
 	      }