X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-core%2Fsocket.c;h=ecc137bafa497fdfea14757cc6afb7f6760c83d1;hb=c75a6b480b047abc73ee7afd912aef249e9da8e3;hp=55db70408d823dd4dc52775fe27a986e5c2b48b6;hpb=c0244c2448a5504581ae24e78b5859760b999b8e;p=catta

diff --git a/avahi-core/socket.c b/avahi-core/socket.c
index 55db704..ecc137b 100644
--- a/avahi-core/socket.c
+++ b/avahi-core/socket.c
@@ -35,37 +35,35 @@
 #include <sys/time.h>
 #include <net/if.h>
 #include <sys/ioctl.h>
+#include <assert.h>
 
 #include "dns.h"
-#include "util.h"
+#include "fdutil.h"
 #include "socket.h"
 #include "log.h"
 
 static void mdns_mcast_group_ipv4(struct sockaddr_in *ret_sa) {
-    g_assert(ret_sa);
+    assert(ret_sa);
 
     memset(ret_sa, 0, sizeof(struct sockaddr_in));
-    
     ret_sa->sin_family = AF_INET;
     ret_sa->sin_port = htons(AVAHI_MDNS_PORT);
-    inet_pton(AF_INET, "224.0.0.251", &ret_sa->sin_addr);
+    inet_pton(AF_INET, AVAHI_IPV4_MCAST_GROUP, &ret_sa->sin_addr);
 }
 
 static void mdns_mcast_group_ipv6(struct sockaddr_in6 *ret_sa) {
-
-    g_assert(ret_sa);
+    assert(ret_sa);
 
     memset(ret_sa, 0, sizeof(struct sockaddr_in6));
-    
     ret_sa->sin6_family = AF_INET6;
     ret_sa->sin6_port = htons(AVAHI_MDNS_PORT);
-    inet_pton(AF_INET6, "ff02::fb", &ret_sa->sin6_addr);
+    inet_pton(AF_INET6, AVAHI_IPV6_MCAST_GROUP, &ret_sa->sin6_addr);
 }
 
-static void ipv4_address_to_sockaddr(struct sockaddr_in *ret_sa, const AvahiIPv4Address *a, guint16 port) {
-    g_assert(ret_sa);
-    g_assert(a);
-    g_assert(port > 0);
+static void ipv4_address_to_sockaddr(struct sockaddr_in *ret_sa, const AvahiIPv4Address *a, uint16_t port) {
+    assert(ret_sa);
+    assert(a);
+    assert(port > 0);
 
     memset(ret_sa, 0, sizeof(struct sockaddr_in));
     ret_sa->sin_family = AF_INET;
@@ -73,10 +71,10 @@ static void ipv4_address_to_sockaddr(struct sockaddr_in *ret_sa, const AvahiIPv4
     memcpy(&ret_sa->sin_addr, a, sizeof(AvahiIPv4Address));
 }
 
-static void ipv6_address_to_sockaddr(struct sockaddr_in6 *ret_sa, const AvahiIPv6Address *a, guint16 port) {
-    g_assert(ret_sa);
-    g_assert(a);
-    g_assert(port > 0);
+static void ipv6_address_to_sockaddr(struct sockaddr_in6 *ret_sa, const AvahiIPv6Address *a, uint16_t port) {
+    assert(ret_sa);
+    assert(a);
+    assert(port > 0);
 
     memset(ret_sa, 0, sizeof(struct sockaddr_in6));
     ret_sa->sin6_family = AF_INET6;
@@ -84,7 +82,7 @@ static void ipv6_address_to_sockaddr(struct sockaddr_in6 *ret_sa, const AvahiIPv
     memcpy(&ret_sa->sin6_addr, a, sizeof(AvahiIPv6Address));
 }
 
-int avahi_mdns_mcast_join_ipv4 (int index, int fd) {
+int avahi_mdns_mcast_join_ipv4(int fd, int idx) {
     struct ip_mreqn mreq; 
     struct sockaddr_in sa;
 
@@ -92,7 +90,7 @@ int avahi_mdns_mcast_join_ipv4 (int index, int fd) {
  
     memset(&mreq, 0, sizeof(mreq));
     mreq.imr_multiaddr = sa.sin_addr;
-    mreq.imr_ifindex = index;
+    mreq.imr_ifindex = idx;
  
     if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
         avahi_log_warn("IP_ADD_MEMBERSHIP failed: %s\n", strerror(errno));
@@ -102,7 +100,7 @@ int avahi_mdns_mcast_join_ipv4 (int index, int fd) {
     return 0;
 }
 
-int avahi_mdns_mcast_join_ipv6 (int index, int fd) {
+int avahi_mdns_mcast_join_ipv6(int fd, int idx) {
     struct ipv6_mreq mreq6; 
     struct sockaddr_in6 sa6;
 
@@ -110,7 +108,7 @@ int avahi_mdns_mcast_join_ipv6 (int index, int fd) {
 
     memset(&mreq6, 0, sizeof(mreq6));
     mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
-    mreq6.ipv6mr_interface = index;
+    mreq6.ipv6mr_interface = idx;
 
     if (setsockopt(fd, SOL_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
         avahi_log_warn("IPV6_ADD_MEMBERSHIP failed: %s\n", strerror(errno));
@@ -120,7 +118,7 @@ int avahi_mdns_mcast_join_ipv6 (int index, int fd) {
     return 0;
 }
 
-int avahi_mdns_mcast_leave_ipv4 (int index, int fd) {
+int avahi_mdns_mcast_leave_ipv4(int fd, int idx) {
     struct ip_mreqn mreq; 
     struct sockaddr_in sa;
     
@@ -128,7 +126,7 @@ int avahi_mdns_mcast_leave_ipv4 (int index, int fd) {
  
     memset(&mreq, 0, sizeof(mreq));
     mreq.imr_multiaddr = sa.sin_addr;
-    mreq.imr_ifindex = index;
+    mreq.imr_ifindex = idx;
  
     if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
         avahi_log_warn("IP_DROP_MEMBERSHIP failed: %s\n", strerror(errno));
@@ -138,7 +136,7 @@ int avahi_mdns_mcast_leave_ipv4 (int index, int fd) {
     return 0;
 }
 
-int avahi_mdns_mcast_leave_ipv6 (int index, int fd) {
+int avahi_mdns_mcast_leave_ipv6(int fd, int idx) {
     struct ipv6_mreq mreq6; 
     struct sockaddr_in6 sa6;
 
@@ -146,7 +144,7 @@ int avahi_mdns_mcast_leave_ipv6 (int index, int fd) {
 
     memset(&mreq6, 0, sizeof(mreq6));
     mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
-    mreq6.ipv6mr_interface = index;
+    mreq6.ipv6mr_interface = idx;
 
     if (setsockopt(fd, SOL_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
         avahi_log_warn("IPV6_DROP_MEMBERSHIP failed: %s\n", strerror(errno));
@@ -156,7 +154,51 @@ int avahi_mdns_mcast_leave_ipv6 (int index, int fd) {
     return 0;
 }
 
-gint avahi_open_socket_ipv4(void) {
+static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) {
+    int yes;
+    
+    assert(fd >= 0);
+    assert(sa);
+    assert(l > 0);
+    
+    if (bind(fd, sa, l) < 0) {
+
+        if (errno != EADDRINUSE) {
+            avahi_log_warn("bind() failed: %s\n", strerror(errno));
+            return -1;
+        }
+            
+        avahi_log_warn("*** WARNING: Detected another %s mDNS stack running on this host. This makes mDNS unreliable and is thus not recommended. ***",
+                       sa->sa_family == AF_INET ? "IPv4" : "IPv6");
+
+        /* Try again, this time with SO_REUSEADDR set */
+        yes = 1;
+        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+            avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
+            return -1;
+        }
+
+        if (bind(fd, sa, l) < 0) {
+            avahi_log_warn("bind() failed: %s\n", strerror(errno));
+            return -1;
+        }
+    } else {
+
+        /* We enable SO_REUSEADDR afterwards, to make sure that the
+         * user may run other mDNS implementations if he really
+         * wants. */
+        
+        yes = 1;
+        if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+            avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+int avahi_open_socket_ipv4(void) {
     struct sockaddr_in local;
     int fd = -1, ttl, yes;
         
@@ -177,27 +219,18 @@ gint avahi_open_socket_ipv4(void) {
         goto fail;
     }
     
-    yes = 1;
-    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
-        goto fail;
-    }
-
     yes = 1;
     if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
         avahi_log_warn("IP_MULTICAST_LOOP failed: %s\n", strerror(errno));
         goto fail;
     }
-
     
     memset(&local, 0, sizeof(local));
     local.sin_family = AF_INET;
     local.sin_port = htons(AVAHI_MDNS_PORT);
-    
-    if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
-        avahi_log_warn("bind() failed: %s\n", strerror(errno));
+
+    if (bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local)) < 0)
         goto fail;
-    }
 
     yes = 1;
     if (setsockopt(fd, SOL_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0) {
@@ -230,7 +263,7 @@ fail:
     return -1;
 }
 
-gint avahi_open_socket_ipv6(void) {
+int avahi_open_socket_ipv6(void) {
     struct sockaddr_in6 sa, local;
     int fd = -1, ttl, yes;
 
@@ -253,12 +286,6 @@ gint avahi_open_socket_ipv6(void) {
         goto fail;
     }
     
-    yes = 1;
-    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("SO_REUSEADDR failed: %s\n", strerror(errno));
-        goto fail;
-    }
-
     yes = 1;
     if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) {
         avahi_log_warn("IPV6_V6ONLY failed: %s\n", strerror(errno));
@@ -275,10 +302,8 @@ gint avahi_open_socket_ipv6(void) {
     local.sin6_family = AF_INET6;
     local.sin6_port = htons(AVAHI_MDNS_PORT);
     
-    if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
-        avahi_log_warn("bind() failed: %s\n", strerror(errno));
+    if (bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local)) < 0)
         goto fail;
-    }
 
     yes = 1;
     if (setsockopt(fd, SOL_IPV6, IPV6_HOPLIMIT, &yes, sizeof(yes)) < 0) {
@@ -311,9 +336,9 @@ fail:
     return -1;
 }
 
-static gint sendmsg_loop(gint fd, struct msghdr *msg, gint flags) {
-    g_assert(fd >= 0);
-    g_assert(msg);
+static int sendmsg_loop(int fd, struct msghdr *msg, int flags) {
+    assert(fd >= 0);
+    assert(msg);
 
     for (;;) {
     
@@ -332,18 +357,17 @@ static gint sendmsg_loop(gint fd, struct msghdr *msg, gint flags) {
     return 0;
 }
 
-gint avahi_send_dns_packet_ipv4(gint fd, gint interface, AvahiDnsPacket *p, const AvahiIPv4Address *a, guint16 port) {
+int avahi_send_dns_packet_ipv4(int fd, int interface, AvahiDnsPacket *p, const AvahiIPv4Address *a, uint16_t port) {
     struct sockaddr_in sa;
     struct msghdr msg;
     struct iovec io;
     struct cmsghdr *cmsg;
-    struct in_pktinfo *pkti;
     uint8_t cmsg_data[sizeof(struct cmsghdr) + sizeof(struct in_pktinfo)];
 
-    g_assert(fd >= 0);
-    g_assert(p);
-    g_assert(avahi_dns_packet_check_valid(p) >= 0);
-    g_assert(!a || port > 0);
+    assert(fd >= 0);
+    assert(p);
+    assert(avahi_dns_packet_check_valid(p) >= 0);
+    assert(!a || port > 0);
 
     if (!a)
         mdns_mcast_group_ipv4(&sa);
@@ -354,38 +378,45 @@ gint avahi_send_dns_packet_ipv4(gint fd, gint interface, AvahiDnsPacket *p, cons
     io.iov_base = AVAHI_DNS_PACKET_DATA(p);
     io.iov_len = p->size;
 
-    memset(cmsg_data, 0, sizeof(cmsg_data));
-    cmsg = (struct cmsghdr*) cmsg_data;
-    cmsg->cmsg_len = sizeof(cmsg_data);
-    cmsg->cmsg_level = IPPROTO_IP;
-    cmsg->cmsg_type = IP_PKTINFO;
-
-    pkti = (struct in_pktinfo*) (cmsg_data + sizeof(struct cmsghdr));
-    pkti->ipi_ifindex = interface;
-    
     memset(&msg, 0, sizeof(msg));
     msg.msg_name = &sa;
     msg.msg_namelen = sizeof(sa);
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
-    msg.msg_control = cmsg_data;
-    msg.msg_controllen = sizeof(cmsg_data);
     msg.msg_flags = 0;
 
-    return sendmsg_loop(fd, &msg, MSG_DONTROUTE);
+    if (interface >= 0) {
+        struct in_pktinfo *pkti;
+        
+        memset(cmsg_data, 0, sizeof(cmsg_data));
+        cmsg = (struct cmsghdr*) cmsg_data;
+        cmsg->cmsg_len = sizeof(cmsg_data);
+        cmsg->cmsg_level = IPPROTO_IP;
+        cmsg->cmsg_type = IP_PKTINFO;
+        
+        pkti = (struct in_pktinfo*) (cmsg_data + sizeof(struct cmsghdr));
+        pkti->ipi_ifindex = interface;
+
+        msg.msg_control = cmsg_data;
+        msg.msg_controllen = sizeof(cmsg_data);
+    } else {
+        msg.msg_control = NULL;
+        msg.msg_controllen = 0;
+    }
+
+    return sendmsg_loop(fd, &msg, 0);
 }
 
-gint avahi_send_dns_packet_ipv6(gint fd, gint interface, AvahiDnsPacket *p, const AvahiIPv6Address *a, guint16 port) {
+int avahi_send_dns_packet_ipv6(int fd, int interface, AvahiDnsPacket *p, const AvahiIPv6Address *a, uint16_t port) {
     struct sockaddr_in6 sa;
     struct msghdr msg;
     struct iovec io;
     struct cmsghdr *cmsg;
-    struct in6_pktinfo *pkti;
     uint8_t cmsg_data[sizeof(struct cmsghdr) + sizeof(struct in6_pktinfo)];
 
-    g_assert(fd >= 0);
-    g_assert(p);
-    g_assert(avahi_dns_packet_check_valid(p) >= 0);
+    assert(fd >= 0);
+    assert(p);
+    assert(avahi_dns_packet_check_valid(p) >= 0);
 
     if (!a)
         mdns_mcast_group_ipv6(&sa);
@@ -396,41 +427,47 @@ gint avahi_send_dns_packet_ipv6(gint fd, gint interface, AvahiDnsPacket *p, cons
     io.iov_base = AVAHI_DNS_PACKET_DATA(p);
     io.iov_len = p->size;
 
-    memset(cmsg_data, 0, sizeof(cmsg_data));
-    cmsg = (struct cmsghdr*) cmsg_data;
-    cmsg->cmsg_len = sizeof(cmsg_data);
-    cmsg->cmsg_level = IPPROTO_IPV6;
-    cmsg->cmsg_type = IPV6_PKTINFO;
-
-    pkti = (struct in6_pktinfo*) (cmsg_data + sizeof(struct cmsghdr));
-    pkti->ipi6_ifindex = interface;
     
     memset(&msg, 0, sizeof(msg));
     msg.msg_name = &sa;
     msg.msg_namelen = sizeof(sa);
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
-    msg.msg_control = cmsg_data;
-    msg.msg_controllen = sizeof(cmsg_data);
     msg.msg_flags = 0;
 
-    return sendmsg_loop(fd, &msg, MSG_DONTROUTE);
+    if (interface >= 0) {
+        struct in6_pktinfo *pkti;
+    
+        memset(cmsg_data, 0, sizeof(cmsg_data));
+        cmsg = (struct cmsghdr*) cmsg_data;
+        cmsg->cmsg_len = sizeof(cmsg_data);
+        cmsg->cmsg_level = IPPROTO_IPV6;
+        cmsg->cmsg_type = IPV6_PKTINFO;
+        
+        pkti = (struct in6_pktinfo*) (cmsg_data + sizeof(struct cmsghdr));
+        pkti->ipi6_ifindex = interface;
+        
+        msg.msg_control = cmsg_data;
+        msg.msg_controllen = sizeof(cmsg_data);
+    } else {
+        msg.msg_control = NULL;
+        msg.msg_controllen = 0;
+    }
+    
+    return sendmsg_loop(fd, &msg, 0);
 }
 
-AvahiDnsPacket* avahi_recv_dns_packet_ipv4(gint fd, struct sockaddr_in *ret_sa, gint *ret_iface, guint8* ret_ttl) {
+AvahiDnsPacket* avahi_recv_dns_packet_ipv4(int fd, struct sockaddr_in *ret_sa, AvahiIPv4Address *ret_dest_address, int *ret_iface, uint8_t* ret_ttl) {
     AvahiDnsPacket *p= NULL;
     struct msghdr msg;
     struct iovec io;
     uint8_t aux[1024];
     ssize_t l;
     struct cmsghdr *cmsg;
-    gboolean found_ttl = FALSE, found_iface = FALSE;
-    guint ms;
+    int found_ttl = 0, found_iface = 0;
+    int ms;
 
-    g_assert(fd >= 0);
-    g_assert(ret_sa);
-    g_assert(ret_iface);
-    g_assert(ret_ttl);
+    assert(fd >= 0);
 
     if (ioctl(fd, FIONREAD, &ms) < 0) {
         avahi_log_warn("ioctl(): %s", strerror(errno));
@@ -443,8 +480,13 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv4(gint fd, struct sockaddr_in *ret_sa,
     io.iov_len = p->max_size;
     
     memset(&msg, 0, sizeof(msg));
-    msg.msg_name = ret_sa;
-    msg.msg_namelen = sizeof(struct sockaddr_in);
+    if (ret_sa) {
+        msg.msg_name = ret_sa;
+        msg.msg_namelen = sizeof(struct sockaddr_in);
+    } else {
+        msg.msg_name = NULL;
+        msg.msg_namelen = 0;
+    }
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
     msg.msg_control = aux;
@@ -456,43 +498,43 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv4(gint fd, struct sockaddr_in *ret_sa,
         goto fail;
     }
 
-    if (ret_sa->sin_addr.s_addr == INADDR_ANY) {
+    if (ret_sa && ret_sa->sin_addr.s_addr == INADDR_ANY) {
         /* Linux 2.4 behaves very strangely sometimes! */
 
-        avahi_hexdump(AVAHI_DNS_PACKET_DATA(p), l); 
-        
-        
+        /*avahi_hexdump(AVAHI_DNS_PACKET_DATA(p), l); */
         goto fail;
     }
     
-    g_assert(!(msg.msg_flags & MSG_CTRUNC));
-    g_assert(!(msg.msg_flags & MSG_TRUNC));
+    assert(!(msg.msg_flags & MSG_CTRUNC));
+    assert(!(msg.msg_flags & MSG_TRUNC));
     p->size = (size_t) l;
-    
-    *ret_ttl = 0;
 
-/*     avahi_hexdump(msg.msg_control, msg.msg_controllen); */
-        
+    if (ret_ttl)
+        *ret_ttl = 0;
+
     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
 
-/*         avahi_hexdump(CMSG_DATA(cmsg), cmsg->cmsg_len - sizeof(struct cmsghdr)); */
-        
         if (cmsg->cmsg_level == SOL_IP) {
             
             if (cmsg->cmsg_type == IP_TTL) {
-                *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
-                found_ttl = TRUE;
+                if (ret_ttl)
+                    *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
+                found_ttl = 1;
             } else if (cmsg->cmsg_type == IP_PKTINFO) {
-                *ret_iface = (gint) ((struct in_pktinfo*) CMSG_DATA(cmsg))->ipi_ifindex;
-                found_iface = TRUE;
+                struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
+
+                if (ret_iface)
+                    *ret_iface = (int) i->ipi_ifindex;
+
+                if (ret_dest_address)
+                    ret_dest_address->address = i->ipi_addr.s_addr;
+                found_iface = 1;
             }
         }
     }
 
-/*     avahi_log_debug("ttl=%u iface=%i", *ret_ttl, *ret_iface); */
-
-    g_assert(found_iface);
-    g_assert(found_ttl);
+    assert(found_iface);
+    assert(found_ttl);
 
     return p;
 
@@ -503,21 +545,18 @@ fail:
     return NULL;
 }
 
-AvahiDnsPacket* avahi_recv_dns_packet_ipv6(gint fd, struct sockaddr_in6 *ret_sa, gint *ret_iface, guint8* ret_ttl) {
+AvahiDnsPacket* avahi_recv_dns_packet_ipv6(int fd, struct sockaddr_in6 *ret_sa, AvahiIPv6Address *ret_dest_address, int *ret_iface, uint8_t* ret_ttl) {
     AvahiDnsPacket *p = NULL;
     struct msghdr msg;
     struct iovec io;
     uint8_t aux[64];
     ssize_t l;
-    guint ms;
+    int ms;
     
     struct cmsghdr *cmsg;
-    gboolean found_ttl = FALSE, found_iface = FALSE;
+    int found_ttl = 0, found_iface = 0;
 
-    g_assert(fd >= 0);
-    g_assert(ret_sa);
-    g_assert(ret_iface);
-    g_assert(ret_ttl);
+    assert(fd >= 0);
 
     if (ioctl(fd, FIONREAD, &ms) < 0) {
         avahi_log_warn("ioctl(): %s", strerror(errno));
@@ -530,8 +569,14 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv6(gint fd, struct sockaddr_in6 *ret_sa,
     io.iov_len = p->max_size;
     
     memset(&msg, 0, sizeof(msg));
-    msg.msg_name = ret_sa;
-    msg.msg_namelen = sizeof(struct sockaddr_in6);
+    if (ret_sa) {
+        msg.msg_name = ret_sa;
+        msg.msg_namelen = sizeof(struct sockaddr_in6);
+    } else {
+        msg.msg_name = NULL;
+        msg.msg_namelen = 0;
+    }
+    
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
     msg.msg_control = aux;
@@ -544,23 +589,33 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv6(gint fd, struct sockaddr_in6 *ret_sa,
     }
 
     p->size = (size_t) l;
-    
-    *ret_ttl = 0;
+
+    if (ret_ttl)
+        *ret_ttl = 0;
 
     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
         if (cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_HOPLIMIT) {
-            *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
-            found_ttl = TRUE;
+
+            if (ret_ttl)
+                *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
+            
+            found_ttl = 1;
         }
             
         if (cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
-            *ret_iface = ((struct in6_pktinfo*) CMSG_DATA(cmsg))->ipi6_ifindex;
-            found_iface = TRUE;
+            struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+
+            if (ret_iface)
+                *ret_iface = i->ipi6_ifindex;
+
+            if (ret_dest_address)
+                memcpy(ret_dest_address->address, i->ipi6_addr.s6_addr, 16);
+            found_iface = 1;
         }
     }
 
-    g_assert(found_iface);
-    g_assert(found_ttl);
+    assert(found_iface);
+    assert(found_ttl);
 
     return p;
 
@@ -571,7 +626,7 @@ fail:
     return NULL;
 }
 
-gint avahi_open_legacy_unicast_socket_ipv4(void) {
+int avahi_open_unicast_socket_ipv4(void) {
     struct sockaddr_in local;
     int fd = -1, yes;
         
@@ -619,8 +674,8 @@ fail:
     return -1;
 }
 
-gint avahi_open_legacy_unicast_socket_ipv6(void) {
-    struct sockaddr_in local;
+int avahi_open_unicast_socket_ipv6(void) {
+    struct sockaddr_in6 local;
     int fd = -1, yes;
         
     if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
@@ -629,7 +684,7 @@ gint avahi_open_legacy_unicast_socket_ipv6(void) {
     }
     
     memset(&local, 0, sizeof(local));
-    local.sin_family = AF_INET;
+    local.sin6_family = AF_INET6;
     
     if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
         avahi_log_warn("bind() failed: %s\n", strerror(errno));