X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=avahi-core%2Fsocket.c;h=17ab6e553b0074b1f2c608b11e94d2ca76049641;hb=9c0f9c65093cfa53d45f9b68782321eb8063a032;hp=9291f0845ef4de8408cfa486f93a4826dd320fcf;hpb=e2847ebc0efccbc368af59d53863b7c54c1970da;p=catta diff --git a/avahi-core/socket.c b/avahi-core/socket.c index 9291f08..17ab6e5 100644 --- a/avahi-core/socket.c +++ b/avahi-core/socket.c @@ -1,18 +1,16 @@ -/* $Id$ */ - /*** This file is part of avahi. - + avahi is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. - + avahi 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 Lesser General Public License for more details. - + You should have received a copy of the GNU Lesser General Public License along with avahi; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 @@ -137,13 +135,13 @@ int avahi_mdns_mcast_join_ipv4(int fd, const AvahiIPv4Address *a, int idx, int j 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, const AvahiIPv6Address *a, int idx, int join) { - struct ipv6_mreq mreq6; + struct ipv6_mreq mreq6; struct sockaddr_in6 sa6; assert(fd >= 0); @@ -157,7 +155,7 @@ int avahi_mdns_mcast_join_ipv6(int fd, const AvahiIPv6Address *a, int idx, int j if (join) setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)); - + 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; @@ -168,13 +166,13 @@ int avahi_mdns_mcast_join_ipv6(int fd, const AvahiIPv6Address *a, int idx, int j static int reuseaddr(int fd) { int yes; - + yes = 1; if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) { avahi_log_warn("SO_REUSEADDR failed: %s", strerror(errno)); return -1; } - + #ifdef SO_REUSEPORT yes = 1; if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)) < 0) { @@ -182,30 +180,30 @@ static int reuseaddr(int fd) { return -1; } #endif - + return 0; } static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) { - + assert(fd >= 0); assert(sa); assert(l > 0); - + if (bind(fd, sa, l) < 0) { if (errno != EADDRINUSE) { avahi_log_warn("bind() failed: %s", 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 */ if (reuseaddr(fd) < 0) return -1; - + if (bind(fd, sa, l) < 0) { avahi_log_warn("bind() failed: %s", strerror(errno)); return -1; @@ -215,7 +213,7 @@ static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) { /* We enable SO_REUSEADDR afterwards, to make sure that the * user may run other mDNS implementations if he really * wants. */ - + if (reuseaddr(fd) < 0) return -1; } @@ -225,7 +223,7 @@ static int bind_with_warn(int fd, const struct sockaddr *sa, socklen_t l) { static int ipv4_pktinfo(int fd) { int yes; - + #ifdef IP_PKTINFO yes = 1; if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0) { @@ -233,7 +231,7 @@ static int ipv4_pktinfo(int fd) { return -1; } #else - + #ifdef IP_RECVINTERFACE yes = 1; if (setsockopt (fd, IPPROTO_IP, IP_RECVINTERFACE, &yes, sizeof(yes)) < 0) { @@ -247,7 +245,7 @@ static int ipv4_pktinfo(int fd) { return -1; } #endif - + #ifdef IP_RECVDSTADDR yes = 1; if (setsockopt (fd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) < 0) { @@ -255,7 +253,7 @@ static int ipv4_pktinfo(int fd) { return -1; } #endif - + #endif /* IP_PKTINFO */ #ifdef IP_RECVTTL @@ -271,7 +269,7 @@ static int ipv4_pktinfo(int fd) { static int ipv6_pktinfo(int fd) { int yes; - + #ifdef IPV6_RECVPKTINFO yes = 1; if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0) { @@ -313,12 +311,12 @@ int avahi_open_socket_ipv4(int no_reuse) { struct sockaddr_in local; int fd = -1, r, ittl; uint8_t ttl, cyes; - + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { avahi_log_warn("socket() failed: %s", strerror(errno)); goto fail; } - + ttl = 255; if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) { avahi_log_warn("IP_MULTICAST_TTL failed: %s", strerror(errno)); @@ -330,13 +328,13 @@ int avahi_open_socket_ipv4(int no_reuse) { avahi_log_warn("IP_TTL failed: %s", strerror(errno)); goto fail; } - + 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; } - + memset(&local, 0, sizeof(local)); local.sin_family = AF_INET; local.sin_port = htons(AVAHI_MDNS_PORT); @@ -356,7 +354,7 @@ int avahi_open_socket_ipv4(int no_reuse) { avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno)); goto fail; } - + if (avahi_set_nonblock(fd) < 0) { avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno)); goto fail; @@ -377,12 +375,12 @@ int avahi_open_socket_ipv6(int no_reuse) { int ttl; mdns_mcast_group_ipv6(&sa); - + if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { avahi_log_warn("socket() failed: %s", strerror(errno)); goto fail; } - + ttl = 255; if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0) { avahi_log_warn("IPV6_MULTICAST_HOPS failed: %s", strerror(errno)); @@ -394,7 +392,7 @@ int avahi_open_socket_ipv6(int no_reuse) { avahi_log_warn("IPV6_UNICAST_HOPS failed: %s", strerror(errno)); goto fail; } - + yes = 1; if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) { avahi_log_warn("IPV6_V6ONLY failed: %s", strerror(errno)); @@ -410,7 +408,7 @@ int avahi_open_socket_ipv6(int no_reuse) { memset(&local, 0, sizeof(local)); local.sin6_family = AF_INET6; local.sin6_port = htons(AVAHI_MDNS_PORT); - + if (no_reuse) r = bind(fd, (struct sockaddr*) &local, sizeof(local)); else @@ -421,12 +419,12 @@ int avahi_open_socket_ipv6(int no_reuse) { if (ipv6_pktinfo(fd) < 0) goto fail; - + if (avahi_set_cloexec(fd) < 0) { avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno)); goto fail; } - + if (avahi_set_nonblock(fd) < 0) { avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno)); goto fail; @@ -446,15 +444,22 @@ static int sendmsg_loop(int fd, struct msghdr *msg, int flags) { assert(msg); for (;;) { - + if (sendmsg(fd, msg, flags) >= 0) break; - + + if (errno == EINTR) + continue; + if (errno != EAGAIN) { - avahi_log_debug("sendmsg() failed: %s", strerror(errno)); + char where[64]; + struct sockaddr_in *sin = msg->msg_name; + + inet_ntop(sin->sin_family, &sin->sin_addr, where, sizeof(where)); + avahi_log_debug("sendmsg() to %s failed: %s", where, strerror(errno)); return -1; } - + if (avahi_wait_for_write(fd) < 0) return -1; } @@ -469,16 +474,16 @@ int avahi_send_dns_packet_ipv4( 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[CMSG_SPACE(sizeof(struct in_pktinfo))]; -#elif defined(IP_SENDSRCADDR) + size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1]; +#elif !defined(IP_MULTICAST_IF) && defined(IP_SENDSRCADDR) struct cmsghdr *cmsg; - uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_addr))]; + size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_addr)) / sizeof(size_t)) + 1]; #endif assert(fd >= 0); @@ -507,51 +512,47 @@ int avahi_send_dns_packet_ipv4( #ifdef IP_PKTINFO if (interface > 0 || src_address) { struct in_pktinfo *pkti; - + memset(cmsg_data, 0, sizeof(cmsg_data)); msg.msg_control = cmsg_data; - msg.msg_controllen = sizeof(cmsg_data); - + msg.msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)); + cmsg = CMSG_FIRSTHDR(&msg); - cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); + cmsg->cmsg_len = msg.msg_controllen; cmsg->cmsg_level = IPPROTO_IP; cmsg->cmsg_type = IP_PKTINFO; pkti = (struct in_pktinfo*) CMSG_DATA(cmsg); - if (interface > 0) + if (interface > 0) pkti->ipi_ifindex = interface; if (src_address) pkti->ipi_spec_dst.s_addr = src_address->address; - - msg.msg_controllen = cmsg->cmsg_len; + } +#elif defined(IP_MULTICAST_IF) + if (src_address) { + struct in_addr any = { INADDR_ANY }; + if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, src_address ? &src_address->address : &any, sizeof(struct in_addr)) < 0) { + avahi_log_warn("IP_MULTICAST_IF failed: %s", strerror(errno)); + return -1; + } } #elif defined(IP_SENDSRCADDR) if (src_address) { struct in_addr *addr; memset(cmsg_data, 0, sizeof(cmsg_data)); - msg.msg_control = cmsg_data; - msg.msg_controllen = sizeof(cmsg_data); - - cmsg = CMSG_FIRSTHDR(&msg); - 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_controllen = cmsg->cmsg_len; -} -#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; - } + msg.msg_control = cmsg_data; + msg.msg_controllen = CMSG_LEN(sizeof(struct in_addr)); + + cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_len = msg.msg_controllen; + cmsg->cmsg_level = IPPROTO_IP; + cmsg->cmsg_type = IP_SENDSRCADDR; + + addr = (struct in_addr *)CMSG_DATA(cmsg); + addr->s_addr = src_address->address; } #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" @@ -560,12 +561,19 @@ int avahi_send_dns_packet_ipv4( return sendmsg_loop(fd, &msg, 0); } -int avahi_send_dns_packet_ipv6(int fd, AvahiIfIndex interface, AvahiDnsPacket *p, const AvahiIPv6Address *src_address, const AvahiIPv6Address *dst_address, uint16_t dst_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[CMSG_SPACE(sizeof(struct in6_pktinfo))]; + size_t cmsg_data[(CMSG_SPACE(sizeof(struct in6_pktinfo))/sizeof(size_t)) + 1]; assert(fd >= 0); assert(p); @@ -593,13 +601,13 @@ int avahi_send_dns_packet_ipv6(int fd, AvahiIfIndex interface, AvahiDnsPacket *p memset(cmsg_data, 0, sizeof(cmsg_data)); msg.msg_control = cmsg_data; - msg.msg_controllen = sizeof(cmsg_data); - + msg.msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)); + cmsg = CMSG_FIRSTHDR(&msg); - cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); + cmsg->cmsg_len = msg.msg_controllen; cmsg->cmsg_level = IPPROTO_IPV6; cmsg->cmsg_type = IPV6_PKTINFO; - + pkti = (struct in6_pktinfo*) CMSG_DATA(cmsg); if (interface > 0) @@ -607,17 +615,22 @@ int avahi_send_dns_packet_ipv6(int fd, AvahiIfIndex interface, AvahiDnsPacket *p if (src_address) memcpy(&pkti->ipi6_addr, src_address->address, sizeof(src_address->address)); - - msg.msg_controllen = cmsg->cmsg_len; } else { msg.msg_control = NULL; msg.msg_controllen = 0; } - + return sendmsg_loop(fd, &msg, 0); } -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 *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; @@ -635,11 +648,16 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_add goto fail; } + if (ms < 0) { + avahi_log_warn("FIONREAD returned negative value."); + goto fail; + } + p = avahi_dns_packet_new(ms + AVAHI_DNS_PACKET_EXTRA_SIZE); io.iov_base = AVAHI_DNS_PACKET_DATA(p); io.iov_len = p->max_size; - + memset(&msg, 0, sizeof(msg)); msg.msg_name = &sa; msg.msg_namelen = sizeof(sa); @@ -648,16 +666,27 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_add msg.msg_control = aux; msg.msg_controllen = sizeof(aux); msg.msg_flags = 0; - + if ((l = recvmsg(fd, &msg, 0)) < 0) { - avahi_log_warn("recvmsg(): %s", strerror(errno)); + /* Linux returns EAGAIN when an invalid IP packet has been + received. We suppress warnings in this case because this might + create quite a bit of log traffic on machines with unstable + links. (See #60) */ + + if (errno != EAGAIN) + avahi_log_warn("recvmsg(): %s", strerror(errno)); + goto fail; } - if (sa.sin_addr.s_addr == INADDR_ANY) { + /* For corrupt packets FIONREAD returns zero size (See rhbz #607297). So + * fail after having read them. */ + if (!ms) + goto fail; + + if (sa.sin_addr.s_addr == INADDR_ANY) /* Linux 2.4 behaves very strangely sometimes! */ goto fail; - } assert(!(msg.msg_flags & MSG_CTRUNC)); assert(!(msg.msg_flags & MSG_TRUNC)); @@ -678,11 +707,11 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_add if (ret_iface) *ret_iface = AVAHI_IF_UNSPEC; - + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { - + if (cmsg->cmsg_level == IPPROTO_IP) { - + switch (cmsg->cmsg_type) { #ifdef IP_RECVTTL case IP_RECVTTL: @@ -696,45 +725,49 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(int fd, AvahiIPv4Address *ret_src_add #ifdef IP_PKTINFO case IP_PKTINFO: { struct in_pktinfo *i = (struct in_pktinfo*) CMSG_DATA(cmsg); - - if (ret_iface) + + if (ret_iface && i->ipi_ifindex > 0) *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) + + if (ret_iface) { #ifdef __sun - *ret_iface = *(uint_t*) sdl; + if (*(uint_t*) sdl > 0) + *ret_iface = *(uint_t*) sdl; #else - *ret_iface = (int) sdl->sdl_index; + + if (sdl->sdl_index > 0) + *ret_iface = (int) sdl->sdl_index; #endif + } 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); + avahi_log_warn("Unhandled cmsg_type: %d", cmsg->cmsg_type); break; } } @@ -751,7 +784,14 @@ fail: return NULL; } -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 *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; @@ -768,30 +808,47 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_add avahi_log_warn("ioctl(): %s", strerror(errno)); goto fail; } - + + if (ms < 0) { + avahi_log_warn("FIONREAD returned negative value."); + goto fail; + } + p = avahi_dns_packet_new(ms + AVAHI_DNS_PACKET_EXTRA_SIZE); io.iov_base = AVAHI_DNS_PACKET_DATA(p); io.iov_len = p->max_size; - + memset(&msg, 0, sizeof(msg)); msg.msg_name = (struct sockaddr*) &sa; msg.msg_namelen = sizeof(sa); - + msg.msg_iov = &io; msg.msg_iovlen = 1; msg.msg_control = aux; msg.msg_controllen = sizeof(aux); msg.msg_flags = 0; - + if ((l = recvmsg(fd, &msg, 0)) < 0) { - avahi_log_warn("recvmsg(): %s", strerror(errno)); + /* Linux returns EAGAIN when an invalid IP packet has been + received. We suppress warnings in this case because this might + create quite a bit of log traffic on machines with unstable + links. (See #60) */ + + if (errno != EAGAIN) + avahi_log_warn("recvmsg(): %s", strerror(errno)); + goto fail; } + /* For corrupt packets FIONREAD returns zero size (See rhbz #607297). So + * fail after having read them. */ + if (!ms) + goto fail; + assert(!(msg.msg_flags & MSG_CTRUNC)); assert(!(msg.msg_flags & MSG_TRUNC)); - + p->size = (size_t) l; if (ret_src_port) @@ -815,24 +872,24 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv6(int fd, AvahiIPv6Address *ret_src_add *ret_ttl = (uint8_t) (*(int *) CMSG_DATA(cmsg)); found_ttl = 1; - + break; case IPV6_PKTINFO: { struct in6_pktinfo *i = (struct in6_pktinfo*) CMSG_DATA(cmsg); - - if (ret_iface) + + if (ret_iface && i->ipi6_ifindex > 0) *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); + avahi_log_warn("Unhandled cmsg_type: %d", cmsg->cmsg_type); break; } } @@ -853,15 +910,15 @@ fail: int avahi_open_unicast_socket_ipv4(void) { struct sockaddr_in local; int fd = -1; - + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { avahi_log_warn("socket() failed: %s", strerror(errno)); goto fail; } - + memset(&local, 0, sizeof(local)); local.sin_family = AF_INET; - + if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) { avahi_log_warn("bind() failed: %s", strerror(errno)); goto fail; @@ -875,7 +932,7 @@ int avahi_open_unicast_socket_ipv4(void) { avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno)); goto fail; } - + if (avahi_set_nonblock(fd) < 0) { avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno)); goto fail; @@ -892,16 +949,22 @@ fail: int avahi_open_unicast_socket_ipv6(void) { struct sockaddr_in6 local; - int fd = -1; - + int fd = -1, yes; + if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { avahi_log_warn("socket() failed: %s", strerror(errno)); goto fail; } - + + yes = 1; + if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) { + avahi_log_warn("IPV6_V6ONLY failed: %s", strerror(errno)); + goto fail; + } + memset(&local, 0, sizeof(local)); local.sin6_family = AF_INET6; - + if (bind(fd, (struct sockaddr*) &local, sizeof(local)) < 0) { avahi_log_warn("bind() failed: %s", strerror(errno)); goto fail; @@ -909,12 +972,12 @@ int avahi_open_unicast_socket_ipv6(void) { if (ipv6_pktinfo(fd) < 0) goto fail; - + if (avahi_set_cloexec(fd) < 0) { avahi_log_warn("FD_CLOEXEC failed: %s", strerror(errno)); goto fail; } - + if (avahi_set_nonblock(fd) < 0) { avahi_log_warn("O_NONBLOCK failed: %s", strerror(errno)); goto fail;