/***
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
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);
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;
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) {
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;
/* 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;
}
static int ipv4_pktinfo(int fd) {
int yes;
-
+
#ifdef IP_PKTINFO
yes = 1;
if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0) {
return -1;
}
#else
-
+
#ifdef IP_RECVINTERFACE
yes = 1;
if (setsockopt (fd, IPPROTO_IP, IP_RECVINTERFACE, &yes, sizeof(yes)) < 0) {
return -1;
}
#endif
-
+
#ifdef IP_RECVDSTADDR
yes = 1;
if (setsockopt (fd, IPPROTO_IP, IP_RECVDSTADDR, &yes, sizeof(yes)) < 0) {
return -1;
}
#endif
-
+
#endif /* IP_PKTINFO */
#ifdef IP_RECVTTL
static int ipv6_pktinfo(int fd) {
int yes;
-
+
#ifdef IPV6_RECVPKTINFO
yes = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0) {
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));
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);
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;
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));
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));
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
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;
assert(msg);
for (;;) {
-
+
if (sendmsg(fd, msg, flags) >= 0)
break;
-
+
if (errno != EAGAIN) {
avahi_log_debug("sendmsg() failed: %s", strerror(errno));
return -1;
}
-
+
if (avahi_wait_for_write(fd) < 0)
return -1;
}
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
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_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;
-}
+ 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(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;
- }
+ 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"
const AvahiIPv6Address *src_address,
const AvahiIPv6Address *dst_address,
uint16_t dst_port) {
-
+
struct sockaddr_in6 sa;
struct msghdr msg;
struct iovec io;
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)
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);
}
AvahiIPv4Address *ret_dst_address,
AvahiIfIndex *ret_iface,
uint8_t *ret_ttl) {
-
+
AvahiDnsPacket *p= NULL;
struct msghdr msg;
struct iovec io;
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);
msg.msg_control = aux;
msg.msg_controllen = sizeof(aux);
msg.msg_flags = 0;
-
+
if ((l = recvmsg(fd, &msg, 0)) < 0) {
/* Linux returns EAGAIN when an invalid IP packet has been
received. We suppress warnings in this case because this might
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:
#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)
#ifdef __sun
*ret_iface = *(uint_t*) sdl;
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;
AvahiIPv6Address *ret_dst_address,
AvahiIfIndex *ret_iface,
uint8_t *ret_ttl) {
-
+
AvahiDnsPacket *p = NULL;
struct msghdr msg;
struct iovec io;
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) {
/* Linux returns EAGAIN when an invalid IP packet has been
received. We suppress warnings in this case because this might
if (errno != EAGAIN)
avahi_log_warn("recvmsg(): %s", strerror(errno));
-
+
goto fail;
}
assert(!(msg.msg_flags & MSG_CTRUNC));
assert(!(msg.msg_flags & MSG_TRUNC));
-
+
p->size = (size_t) l;
if (ret_src_port)
*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)
*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;
assert(found_iface);
assert(found_ttl);
-
+
return p;
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;
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;
int avahi_open_unicast_socket_ipv6(void) {
struct sockaddr_in6 local;
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));
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;
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;
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