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));
goto fail;
}
ittl = 255;
if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ittl, sizeof(ittl)) < 0) {
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);
if (no_reuse)
r = bind(fd, (struct sockaddr*) &local, sizeof(local));
else
r = bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local));
if (r < 0)
goto fail;
if (ipv4_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;
}
return fd;
fail:
if (fd >= 0)
close(fd);
return -1;
}
int avahi_open_socket_ipv6(int no_reuse) {
struct sockaddr_in6 sa, local;
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", 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));
goto fail;
}
ttl = 255;
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, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) {
avahi_log_warn("IPV6_V6ONLY failed: %s", strerror(errno));
goto fail;
}
yes = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
avahi_log_warn("IPV6_MULTICAST_LOOP failed: %s", strerror(errno));
goto fail;
}
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
r = bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local));
if (r < 0)
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;
}
return fd;
fail:
if (fd >= 0)
close(fd);
return -1;
}
int avahi_open_socket_ipv4(int no_reuse,AvahiPublishProtocol proto) {
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));
goto fail;
}
ittl = 255;
if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ittl, sizeof(ittl)) < 0) {
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;
/*
Here we define only port of local structure because this
socket is used by AvahiServer and is used to join multicast
group. we pick the address further from local interface
and joing the group.(ip_mreqn)
avahi_mcast_join_ipv4()/6
*/
local.sin_port = htons(proto == AVAHI_LLMNR ? AVAHI_LLMNR_PORT : AVAHI_MDNS_PORT);
if (no_reuse)
r = bind(fd, (struct sockaddr*) &local, sizeof(local));
else
r = bind_with_warn(fd, (struct sockaddr*) &local, sizeof(local));
if (r < 0)
goto fail;
/*
Just set socket options on 'fd'. No header
is passed.
*/
if (ipv4_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;
}
return fd;
fail:
if (fd >= 0)
close(fd);
return -1;
}
