X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-core%2Fsocket.c;h=cd5241df8d3aa9334152d8b5b01999c66da0f777;hb=5e6703337b90bccb1713ef9cb1aa5f029d75698f;hp=ecc137bafa497fdfea14757cc6afb7f6760c83d1;hpb=1ffedb586bd2fb6daa3970304fac7c5b415cd38f;p=catta

diff --git a/avahi-core/socket.c b/avahi-core/socket.c
index ecc137b..cd5241d 100644
--- a/avahi-core/socket.c
+++ b/avahi-core/socket.c
@@ -27,20 +27,41 @@
 #include <errno.h>
 #include <string.h>
 #include <stdio.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/time.h>
-#include <net/if.h>
 #include <sys/ioctl.h>
 #include <assert.h>
 
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <sys/uio.h>
+
+#ifdef IP_RECVIF
+#include <net/if_dl.h>
+#endif
+
 #include "dns.h"
 #include "fdutil.h"
 #include "socket.h"
 #include "log.h"
+#include "addr-util.h"
+
+/* this is a portability hack */
+#ifndef IPV6_ADD_MEMBERSHIP
+#ifdef  IPV6_JOIN_GROUP
+#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
+#endif
+#endif
+
+#ifndef IPV6_DROP_MEMBERSHIP
+#ifdef  IPV6_LEAVE_GROUP
+#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
+#endif
+#endif
 
 static void mdns_mcast_group_ipv4(struct sockaddr_in *ret_sa) {
     assert(ret_sa);
@@ -82,80 +103,78 @@ 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 fd, int idx) {
-    struct ip_mreqn mreq; 
+int avahi_mdns_mcast_join_ipv4(int fd, const AvahiIPv4Address *a, int idx, int join) {
+#ifdef HAVE_STRUCT_IP_MREQN
+    struct ip_mreqn mreq;
+#else
+    struct ip_mreq mreq;
+#endif
     struct sockaddr_in sa;
 
-    mdns_mcast_group_ipv4 (&sa);
- 
+    assert(fd >= 0);
+    assert(idx >= 0);
+    assert(a);
+
     memset(&mreq, 0, sizeof(mreq));
-    mreq.imr_multiaddr = sa.sin_addr;
+#ifdef HAVE_STRUCT_IP_MREQN
     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));
+    mreq.imr_address.s_addr = a->address;
+#else
+    mreq.imr_interface.s_addr = a->address;
+#endif
+    mdns_mcast_group_ipv4(&sa);
+    mreq.imr_multiaddr = sa.sin_addr;
+
+    if (setsockopt(fd, IPPROTO_IP, join ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
+        avahi_log_warn("%s failed: %s", join ? "IP_ADD_MEMBERSHIP" : "IP_DROP_MEMBERSHIP", strerror(errno));
         return -1;
     } 
 
     return 0;
 }
 
-int avahi_mdns_mcast_join_ipv6(int fd, int idx) {
+int avahi_mdns_mcast_join_ipv6(int fd, const AvahiIPv6Address *a, int idx, int join) {
     struct ipv6_mreq mreq6; 
     struct sockaddr_in6 sa6;
 
-    mdns_mcast_group_ipv6 (&sa6);
+    assert(fd >= 0);
+    assert(idx >= 0);
+    assert(a);
 
     memset(&mreq6, 0, sizeof(mreq6));
+    mdns_mcast_group_ipv6 (&sa6);
     mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
     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));
+    if (setsockopt(fd, IPPROTO_IPV6, join ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
+        avahi_log_warn("%s failed: %s", join ? "IPV6_ADD_MEMBERSHIP" : "IPV6_DROP_MEMBERSHIP", strerror(errno));
         return -1;
     }
 
     return 0;
 }
 
-int avahi_mdns_mcast_leave_ipv4(int fd, int idx) {
-    struct ip_mreqn mreq; 
-    struct sockaddr_in sa;
+static int reuseaddr(int fd) {
+    int yes;
     
-    mdns_mcast_group_ipv4 (&sa);
- 
-    memset(&mreq, 0, sizeof(mreq));
-    mreq.imr_multiaddr = sa.sin_addr;
-    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));
+    yes = 1;
+    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("SO_REUSEADDR failed: %s", strerror(errno));
         return -1;
     }
-
-    return 0;
-}
-
-int avahi_mdns_mcast_leave_ipv6(int fd, int idx) {
-    struct ipv6_mreq mreq6; 
-    struct sockaddr_in6 sa6;
-
-    mdns_mcast_group_ipv6 (&sa6);
-
-    memset(&mreq6, 0, sizeof(mreq6));
-    mreq6.ipv6mr_multiaddr = sa6.sin6_addr;
-    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));
+    
+#ifdef SO_REUSEPORT
+    yes = 1;
+    if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("SO_REUSEPORT failed: %s", strerror(errno));
         return -1;
     }
-
+#endif
+    
     return 0;
 }
 
 static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) {
-    int yes;
     
     assert(fd >= 0);
     assert(sa);
@@ -164,7 +183,7 @@ static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) {
     if (bind(fd, sa, l) < 0) {
 
         if (errno != EADDRINUSE) {
-            avahi_log_warn("bind() failed: %s\n", strerror(errno));
+            avahi_log_warn("bind() failed: %s", strerror(errno));
             return -1;
         }
             
@@ -172,14 +191,11 @@ static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) {
                        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));
+        if (reuseaddr(fd) < 0)
             return -1;
-        }
-
+        
         if (bind(fd, sa, l) < 0) {
-            avahi_log_warn("bind() failed: %s\n", strerror(errno));
+            avahi_log_warn("bind() failed: %s", strerror(errno));
             return -1;
         }
     } else {
@@ -188,40 +204,124 @@ static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) {
          * 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));
+        if (reuseaddr(fd) < 0)
             return -1;
-        }
     }
 
     return 0;
 }
 
-int avahi_open_socket_ipv4(void) {
+static int ipv4_pktinfo(int fd) {
+    int yes;
+    
+#ifdef IP_PKTINFO
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IP_PKTINFO failed: %s", strerror(errno));
+        return -1;
+    }
+#else
+    
+#ifdef IP_RECVINTERFACE
+    yes = 1;
+    if (setsockopt (fd, IPPROTO_IP, IP_RECVINTERFACE, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IP_RECVINTERFACE failed: %s", strerror(errno));
+        return -1;
+    }
+#elif defined(IP_RECVIF)
+    yes = 1;
+    if (setsockopt (fd, IPPROTO_IP, IP_RECVIF, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IP_RECVIF failed: %s", strerror(errno));
+        return -1;
+    }
+#endif
+    
+#ifdef IP_RECVDSTADDR
+    yes = 1;
+    if (setsockopt (fd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IP_RECVDSTADDR failed: %s", strerror(errno));
+        return -1;
+    }
+#endif
+    
+#endif /* IP_PKTINFO */
+
+#ifdef IP_RECVTTL
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IP_RECVTTL failed: %s", strerror(errno));
+        return -1;
+    }
+#endif
+
+    return 0;
+}
+
+static int ipv6_pktinfo(int fd) {
+    int yes;
+    
+#ifdef IPV6_RECVPKTINFO
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_RECVPKTINFO failed: %s", strerror(errno));
+        return -1;
+    }
+#elif defined(IPV6_PKTINFO)
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_PKTINFO, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_PKTINFO failed: %s", strerror(errno));
+        return -1;
+    }
+#endif
+
+#ifdef IPV6_RECVHOPS
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVHOPS, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_RECVHOPS failed: %s", strerror(errno));
+        return -1;
+    }
+#elif defined(IPV6_RECVHOPLIMIT)
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_RECVHOPLIMIT failed: %s", strerror(errno));
+        return -1;
+    }
+#elif defined(IPV6_HOPLIMIT)
+    yes = 1;
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_HOPLIMIT, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_HOPLIMIT failed: %s", strerror(errno));
+        return -1;
+    }
+#endif
+
+    return 0;
+}
+
+int avahi_open_socket_ipv4(int no_reuse) {
     struct sockaddr_in local;
-    int fd = -1, ttl, yes;
+    int fd = -1, r, ittl;
+    uint8_t ttl, cyes;
         
     if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
-        avahi_log_warn("socket() failed: %s\n", strerror(errno));
+        avahi_log_warn("socket() failed: %s", strerror(errno));
         goto fail;
     }
     
     ttl = 255;
-    if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) {
-        avahi_log_warn("IP_MULTICAST_TTL failed: %s\n", strerror(errno));
+    if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) {
+        avahi_log_warn("IP_MULTICAST_TTL failed: %s", strerror(errno));
         goto fail;
     }
 
-    ttl = 255;
-    if (setsockopt(fd, SOL_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) {
-        avahi_log_warn("IP_TTL failed: %s\n", strerror(errno));
+    ittl = 255;
+    if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ittl, sizeof(ittl)) < 0) {
+        avahi_log_warn("IP_TTL failed: %s", 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));
+    cyes = 1;
+    if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &cyes, sizeof(cyes)) < 0) {
+        avahi_log_warn("IP_MULTICAST_LOOP failed: %s", strerror(errno));
         goto fail;
     }
     
@@ -229,28 +329,24 @@ int avahi_open_socket_ipv4(void) {
     local.sin_family = AF_INET;
     local.sin_port = htons(AVAHI_MDNS_PORT);
 
-    if (bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local)) < 0)
-        goto fail;
+    if (no_reuse)
+        r = bind(fd, (struct sockaddr*) &local, sizeof(local));
+    else
+        r = bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local));
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IP_RECVTTL failed: %s\n", strerror(errno));
+    if (r < 0)
         goto fail;
-    }
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IP_PKTINFO failed: %s\n", strerror(errno));
-        goto fail;
-    }
-    
+    if (ipv4_pktinfo (fd) < 0)
+         goto fail;
+
     if (avahi_set_cloexec(fd) < 0) {
-        avahi_log_warn("FD_CLOEXEC failed: %s\n", strerror(errno));
+        avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno));
         goto fail;
     }
     
     if (avahi_set_nonblock(fd) < 0) {
-        avahi_log_warn("O_NONBLOCK failed: %s\n", strerror(errno));
+        avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno));
         goto fail;
     }
 
@@ -263,38 +359,39 @@ fail:
     return -1;
 }
 
-int avahi_open_socket_ipv6(void) {
+int avahi_open_socket_ipv6(int no_reuse) {
     struct sockaddr_in6 sa, local;
-    int fd = -1, ttl, yes;
+    int fd = -1, yes, r;
+    int ttl;
 
     mdns_mcast_group_ipv6(&sa);
         
     if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
-        avahi_log_warn("socket() failed: %s\n", strerror(errno));
+        avahi_log_warn("socket() failed: %s", strerror(errno));
         goto fail;
     }
     
     ttl = 255;
-    if (setsockopt(fd, SOL_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0) {
-        avahi_log_warn("IPV6_MULTICAST_HOPS failed: %s\n", strerror(errno));
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0) {
+        avahi_log_warn("IPV6_MULTICAST_HOPS failed: %s", strerror(errno));
         goto fail;
     }
 
     ttl = 255;
-    if (setsockopt(fd, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0) {
-        avahi_log_warn("IPV6_UNICAST_HOPS failed: %s\n", strerror(errno));
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0) {
+        avahi_log_warn("IPV6_UNICAST_HOPS failed: %s", 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));
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_V6ONLY failed: %s", strerror(errno));
         goto fail;
     }
 
     yes = 1;
-    if (setsockopt(fd, SOL_IPV6, IPV6_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IPV6_MULTICAST_LOOP failed: %s\n", strerror(errno));
+    if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
+        avahi_log_warn("IPV6_MULTICAST_LOOP failed: %s", strerror(errno));
         goto fail;
     }
 
@@ -302,28 +399,24 @@ int avahi_open_socket_ipv6(void) {
     local.sin6_family = AF_INET6;
     local.sin6_port = htons(AVAHI_MDNS_PORT);
     
-    if (bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local)) < 0)
-        goto fail;
+    if (no_reuse)
+        r = bind(fd, (struct sockaddr*) &local, sizeof(local));
+    else
+        r = bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local));
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IPV6, IPV6_HOPLIMIT, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IPV6_HOPLIMIT failed: %s\n", strerror(errno));
+    if (r < 0)
         goto fail;
-    }
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IPV6, IPV6_PKTINFO, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IPV6_PKTINFO failed: %s\n", strerror(errno));
+    if (ipv6_pktinfo(fd) < 0)
         goto fail;
-    }
     
     if (avahi_set_cloexec(fd) < 0) {
-        avahi_log_warn("FD_CLOEXEC failed: %s\n", strerror(errno));
+        avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno));
         goto fail;
     }
     
     if (avahi_set_nonblock(fd) < 0) {
-        avahi_log_warn("O_NONBLOCK failed: %s\n", strerror(errno));
+        avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno));
         goto fail;
     }
 
@@ -346,7 +439,7 @@ static int sendmsg_loop(int fd, struct msghdr *msg, int flags) {
             break;
         
         if (errno != EAGAIN) {
-            avahi_log_debug("sendmsg() failed: %s\n", strerror(errno));
+            avahi_log_debug("sendmsg() failed: %s", strerror(errno));
             return -1;
         }
         
@@ -357,22 +450,27 @@ static int sendmsg_loop(int fd, struct msghdr *msg, int flags) {
     return 0;
 }
 
-int avahi_send_dns_packet_ipv4(int fd, int interface, AvahiDnsPacket *p, const AvahiIPv4Address *a, uint16_t port) {
+int avahi_send_dns_packet_ipv4(int fd, AvahiIfIndex interface, AvahiDnsPacket *p, const AvahiIPv4Address *src_address, const AvahiIPv4Address *dst_address, uint16_t dst_port) {
     struct sockaddr_in sa;
     struct msghdr msg;
     struct iovec io;
+#ifdef IP_PKTINFO
     struct cmsghdr *cmsg;
-    uint8_t cmsg_data[sizeof(struct cmsghdr) + sizeof(struct in_pktinfo)];
+    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_pktinfo))];
+#elif defined(IP_SENDSRCADDR)
+    struct cmsghdr *cmsg;
+    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_addr))];
+#endif
 
     assert(fd >= 0);
     assert(p);
     assert(avahi_dns_packet_check_valid(p) >= 0);
-    assert(!a || port > 0);
+    assert(!dst_address || dst_port > 0);
 
-    if (!a)
+    if (!dst_address)
         mdns_mcast_group_ipv4(&sa);
     else
-        ipv4_address_to_sockaddr(&sa, a, port);
+        ipv4_address_to_sockaddr(&sa, dst_address, dst_port);
 
     memset(&io, 0, sizeof(io));
     io.iov_base = AVAHI_DNS_PACKET_DATA(p);
@@ -384,50 +482,82 @@ int avahi_send_dns_packet_ipv4(int fd, int interface, AvahiDnsPacket *p, const A
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
     msg.msg_flags = 0;
+    msg.msg_control = NULL;
+    msg.msg_controllen = 0;
 
-    if (interface >= 0) {
+#ifdef IP_PKTINFO
+    if (interface > 0 || src_address) {
         struct in_pktinfo *pkti;
         
         memset(cmsg_data, 0, sizeof(cmsg_data));
         cmsg = (struct cmsghdr*) cmsg_data;
-        cmsg->cmsg_len = sizeof(cmsg_data);
+        cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
         cmsg->cmsg_level = IPPROTO_IP;
         cmsg->cmsg_type = IP_PKTINFO;
-        
-        pkti = (struct in_pktinfo*) (cmsg_data + sizeof(struct cmsghdr));
-        pkti->ipi_ifindex = interface;
+
+        pkti = (struct in_pktinfo*) CMSG_DATA(cmsg);
+
+        if (interface > 0) 
+            pkti->ipi_ifindex = interface;
+
+        if (src_address)
+            pkti->ipi_spec_dst.s_addr = src_address->address;
 
         msg.msg_control = cmsg_data;
         msg.msg_controllen = sizeof(cmsg_data);
-    } else {
-        msg.msg_control = NULL;
-        msg.msg_controllen = 0;
     }
+#elif defined(IP_SENDSRCADDR)
+    if (src_address) {
+        struct in_addr *addr;
+      
+	memset(cmsg_data, 0, sizeof(cmsg_data));
+	cmsg = (struct cmsghdr*) cmsg_data;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
+	cmsg->cmsg_level = IPPROTO_IP;
+	cmsg->cmsg_type = IP_SENDSRCADDR;
+	
+	addr = (struct in_addr *)CMSG_DATA(cmsg);
+	addr->s_addr =  src_address->address;
+	
+	msg.msg_control = cmsg_data;
+	msg.msg_controllen = sizeof(cmsg_data);
+    }
+#elif defined(IP_MULTICAST_IF)
+    {
+        struct in_addr any = { INADDR_ANY };
+	if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, src_address ? (const void*) &src_address->address : (const void*) &any, sizeof(struct in_addr)) < 0) {
+	    avahi_log_warn("IP_MULTICAST_IF failed: %s", strerror(errno));
+	    return -1;
+	}
+    }
+#elif defined(__GNUC__)
+#warning "FIXME: We need some code to set the outgoing interface/local address here if IP_PKTINFO/IP_MULTICAST_IF is not available"
+#endif
 
     return sendmsg_loop(fd, &msg, 0);
 }
 
-int avahi_send_dns_packet_ipv6(int fd, int interface, AvahiDnsPacket *p, const AvahiIPv6Address *a, uint16_t port) {
+int avahi_send_dns_packet_ipv6(int fd, AvahiIfIndex interface, AvahiDnsPacket *p, const AvahiIPv6Address *src_address, const AvahiIPv6Address *dst_address, uint16_t dst_port) {
     struct sockaddr_in6 sa;
     struct msghdr msg;
     struct iovec io;
     struct cmsghdr *cmsg;
-    uint8_t cmsg_data[sizeof(struct cmsghdr) + sizeof(struct in6_pktinfo)];
+    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 
     assert(fd >= 0);
     assert(p);
     assert(avahi_dns_packet_check_valid(p) >= 0);
+    assert(!dst_address || dst_port > 0);
 
-    if (!a)
+    if (!dst_address)
         mdns_mcast_group_ipv6(&sa);
     else
-        ipv6_address_to_sockaddr(&sa, a, port);
+        ipv6_address_to_sockaddr(&sa, dst_address, dst_port);
 
     memset(&io, 0, sizeof(io));
     io.iov_base = AVAHI_DNS_PACKET_DATA(p);
     io.iov_len = p->size;
 
-    
     memset(&msg, 0, sizeof(msg));
     msg.msg_name = &sa;
     msg.msg_namelen = sizeof(sa);
@@ -435,17 +565,22 @@ int avahi_send_dns_packet_ipv6(int fd, int interface, AvahiDnsPacket *p, const A
     msg.msg_iovlen = 1;
     msg.msg_flags = 0;
 
-    if (interface >= 0) {
+    if (interface > 0 || src_address) {
         struct in6_pktinfo *pkti;
     
         memset(cmsg_data, 0, sizeof(cmsg_data));
         cmsg = (struct cmsghdr*) cmsg_data;
-        cmsg->cmsg_len = sizeof(cmsg_data);
+        cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
         cmsg->cmsg_level = IPPROTO_IPV6;
         cmsg->cmsg_type = IPV6_PKTINFO;
         
-        pkti = (struct in6_pktinfo*) (cmsg_data + sizeof(struct cmsghdr));
-        pkti->ipi6_ifindex = interface;
+        pkti = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+
+        if (interface > 0)
+            pkti->ipi6_ifindex = interface;
+
+        if (src_address)
+            memcpy(&pkti->ipi6_addr, src_address->address, sizeof(src_address->address));
         
         msg.msg_control = cmsg_data;
         msg.msg_controllen = sizeof(cmsg_data);
@@ -457,15 +592,16 @@ int avahi_send_dns_packet_ipv6(int fd, int interface, AvahiDnsPacket *p, const A
     return sendmsg_loop(fd, &msg, 0);
 }
 
-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 *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_address, uint16_t *ret_src_port, AvahiIPv4Address *ret_dst_address, AvahiIfIndex *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;
-    int found_ttl = 0, found_iface = 0;
+    int found_addr = 0;
     int ms;
+    struct sockaddr_in sa;
 
     assert(fd >= 0);
 
@@ -480,13 +616,8 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv4(int fd, struct sockaddr_in *ret_sa, A
     io.iov_len = p->max_size;
     
     memset(&msg, 0, sizeof(msg));
-    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_name = &sa;
+    msg.msg_namelen = sizeof(sa);
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
     msg.msg_control = aux;
@@ -498,43 +629,89 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv4(int fd, struct sockaddr_in *ret_sa, A
         goto fail;
     }
 
-    if (ret_sa && ret_sa->sin_addr.s_addr == INADDR_ANY) {
+    if (sa.sin_addr.s_addr == INADDR_ANY) {
         /* Linux 2.4 behaves very strangely sometimes! */
-
-        /*avahi_hexdump(AVAHI_DNS_PACKET_DATA(p), l); */
         goto fail;
     }
-    
+
     assert(!(msg.msg_flags & MSG_CTRUNC));
     assert(!(msg.msg_flags & MSG_TRUNC));
+
     p->size = (size_t) l;
 
+    if (ret_src_port)
+        *ret_src_port = avahi_port_from_sockaddr((struct sockaddr*) &sa);
+
+    if (ret_src_address) {
+        AvahiAddress a;
+        avahi_address_from_sockaddr((struct sockaddr*) &sa, &a);
+        *ret_src_address = a.data.ipv4;
+    }
+
     if (ret_ttl)
-        *ret_ttl = 0;
+        *ret_ttl = 255;
 
+    if (ret_iface)
+        *ret_iface = AVAHI_IF_UNSPEC;
+    
     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-
-        if (cmsg->cmsg_level == SOL_IP) {
+        
+        if (cmsg->cmsg_level == IPPROTO_IP) {
             
-            if (cmsg->cmsg_type == IP_TTL) {
-                if (ret_ttl)
-                    *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
-                found_ttl = 1;
-            } else if (cmsg->cmsg_type == IP_PKTINFO) {
-                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;
+            switch (cmsg->cmsg_type) {
+#ifdef IP_RECVTTL
+                case IP_RECVTTL:
+#endif
+                case IP_TTL:
+                    if (ret_ttl)
+                        *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
+
+                    break;
+
+#ifdef IP_PKTINFO
+                case IP_PKTINFO: {
+                    struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg);
+                    
+                    if (ret_iface)
+                        *ret_iface = (int) i->ipi_ifindex;
+                    
+                    if (ret_dst_address)
+                        ret_dst_address->address = i->ipi_addr.s_addr;
+                    
+                    found_addr = 1;
+
+                    break;
+                }
+#endif
+                    
+#ifdef IP_RECVIF
+                case IP_RECVIF: {
+                    struct sockaddr_dl *sdl = (struct sockaddr_dl *) CMSG_DATA (cmsg);
+                    
+                    if (ret_iface)
+                        *ret_iface = (int) sdl->sdl_index;
+
+                    break;
+                }
+#endif
+            
+#ifdef IP_RECVDSTADDR
+                case IP_RECVDSTADDR:
+                    if (ret_dst_address)
+                        memcpy(&ret_dst_address->address, CMSG_DATA (cmsg), 4);
+                    
+                    found_addr = 1;
+                    break;
+#endif
+                    
+                default:
+                    avahi_log_warn("Unhandled cmsg_type : %d", cmsg->cmsg_type);
+                    break;
             }
         }
     }
 
-    assert(found_iface);
-    assert(found_ttl);
+    assert(found_addr);
 
     return p;
 
@@ -545,16 +722,16 @@ fail:
     return NULL;
 }
 
-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 *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_address, uint16_t *ret_src_port, AvahiIPv6Address *ret_dst_address, AvahiIfIndex *ret_iface, uint8_t *ret_ttl) {
     AvahiDnsPacket *p = NULL;
     struct msghdr msg;
     struct iovec io;
     uint8_t aux[64];
     ssize_t l;
     int ms;
-    
     struct cmsghdr *cmsg;
     int found_ttl = 0, found_iface = 0;
+    struct sockaddr_in6 sa;
 
     assert(fd >= 0);
 
@@ -569,13 +746,8 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv6(int fd, struct sockaddr_in6 *ret_sa,
     io.iov_len = p->max_size;
     
     memset(&msg, 0, sizeof(msg));
-    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_name = (struct sockaddr*) &sa;
+    msg.msg_namelen = sizeof(sa);
     
     msg.msg_iov = &io;
     msg.msg_iovlen = 1;
@@ -588,29 +760,52 @@ AvahiDnsPacket* avahi_recv_dns_packet_ipv6(int fd, struct sockaddr_in6 *ret_sa,
         goto fail;
     }
 
+    assert(!(msg.msg_flags & MSG_CTRUNC));
+    assert(!(msg.msg_flags & MSG_TRUNC));
+ 
     p->size = (size_t) l;
 
-    if (ret_ttl)
-        *ret_ttl = 0;
+    if (ret_src_port)
+        *ret_src_port = avahi_port_from_sockaddr((struct sockaddr*) &sa);
+
+    if (ret_src_address) {
+        AvahiAddress a;
+        avahi_address_from_sockaddr((struct sockaddr*) &sa, &a);
+        *ret_src_address = a.data.ipv6;
+    }
 
     for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-        if (cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_HOPLIMIT) {
 
-            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) {
-            struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+        if (cmsg->cmsg_level == IPPROTO_IPV6) {
+
+            switch (cmsg->cmsg_type) {
+
+                case IPV6_HOPLIMIT:
 
-            if (ret_iface)
-                *ret_iface = i->ipi6_ifindex;
+                    if (ret_ttl)
+                        *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg));
 
-            if (ret_dest_address)
-                memcpy(ret_dest_address->address, i->ipi6_addr.s6_addr, 16);
-            found_iface = 1;
+                    found_ttl = 1;
+                    
+                    break;
+
+                case IPV6_PKTINFO: {
+                    struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+                    
+                    if (ret_iface)
+                        *ret_iface = i->ipi6_ifindex;
+                    
+                    if (ret_dst_address)
+                        memcpy(ret_dst_address->address, i->ipi6_addr.s6_addr, 16);
+
+                    found_iface = 1;
+                    break;
+                }
+                    
+                default:
+                    avahi_log_warn("Unhandled cmsg_type : %d", cmsg->cmsg_type);
+                    break;
+            }
         }
     }
 
@@ -628,10 +823,10 @@ fail:
 
 int avahi_open_unicast_socket_ipv4(void) {
     struct sockaddr_in local;
-    int fd = -1, yes;
+    int fd = -1;
         
     if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
-        avahi_log_warn("socket() failed: %s\n", strerror(errno));
+        avahi_log_warn("socket() failed: %s", strerror(errno));
         goto fail;
     }
     
@@ -639,29 +834,21 @@ int avahi_open_unicast_socket_ipv4(void) {
     local.sin_family = AF_INET;
     
     if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
-        avahi_log_warn("bind() failed: %s\n", strerror(errno));
+        avahi_log_warn("bind() failed: %s", strerror(errno));
         goto fail;
     }
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IP_RECVTTL failed: %s\n", strerror(errno));
-        goto fail;
+    if (ipv4_pktinfo(fd) < 0) {
+         goto fail;
     }
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IP_PKTINFO failed: %s\n", strerror(errno));
-        goto fail;
-    }
-    
     if (avahi_set_cloexec(fd) < 0) {
-        avahi_log_warn("FD_CLOEXEC failed: %s\n", strerror(errno));
+        avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno));
         goto fail;
     }
     
     if (avahi_set_nonblock(fd) < 0) {
-        avahi_log_warn("O_NONBLOCK failed: %s\n", strerror(errno));
+        avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno));
         goto fail;
     }
 
@@ -676,10 +863,10 @@ fail:
 
 int avahi_open_unicast_socket_ipv6(void) {
     struct sockaddr_in6 local;
-    int fd = -1, yes;
+    int fd = -1;
         
     if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
-        avahi_log_warn("socket() failed: %s\n", strerror(errno));
+        avahi_log_warn("socket() failed: %s", strerror(errno));
         goto fail;
     }
     
@@ -687,29 +874,20 @@ int avahi_open_unicast_socket_ipv6(void) {
     local.sin6_family = AF_INET6;
     
     if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) {
-        avahi_log_warn("bind() failed: %s\n", strerror(errno));
+        avahi_log_warn("bind() failed: %s", strerror(errno));
         goto fail;
     }
 
-    yes = 1;
-    if (setsockopt(fd, SOL_IPV6, IPV6_HOPLIMIT, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IPV6_HOPLIMIT failed: %s\n", strerror(errno));
-        goto fail;
-    }
-
-    yes = 1;
-    if (setsockopt(fd, SOL_IPV6, IPV6_PKTINFO, &yes, sizeof(yes)) < 0) {
-        avahi_log_warn("IPV6_PKTINFO failed: %s\n", strerror(errno));
+    if (ipv6_pktinfo(fd) < 0)
         goto fail;
-    }
     
     if (avahi_set_cloexec(fd) < 0) {
-        avahi_log_warn("FD_CLOEXEC failed: %s\n", strerror(errno));
+        avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno));
         goto fail;
     }
     
     if (avahi_set_nonblock(fd) < 0) {
-        avahi_log_warn("O_NONBLOCK failed: %s\n", strerror(errno));
+        avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno));
         goto fail;
     }