static int
udp_resolve( udp_connection_t *uc,
struct sockaddr_storage *ss,
const char *host,
int port, int *multicast,
int receiver )
{
struct addrinfo hints, *res, *ressave, *use = NULL;
char port_buf[6];
int x;
snprintf(port_buf, 6, "%d", port);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_flags = (receiver ? AI_PASSIVE : 0) | AI_NUMERICSERV;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
x = getaddrinfo(host, port_buf, &hints, &res);
if (x < 0) {
tvhlog(LOG_ERR, uc->subsystem, "getaddrinfo: %s: %s",
host != NULL ? host : "*",
x == EAI_SYSTEM ? strerror(errno) : gai_strerror(x));
return -1;
}
ressave = res;
while (res) {
if (res->ai_family == tcp_preferred_address_family) {
use = res;
break;
} else if (use == NULL) {
use = res;
}
res = res->ai_next;
}
if (use->ai_family == AF_INET6) {
ss->ss_family = AF_INET6;
IP_AS_V6(*ss, port) = htons(port);
memcpy(&IP_AS_V6(*ss, addr), &((struct sockaddr_in6 *)use->ai_addr)->sin6_addr,
sizeof(struct in6_addr));
*multicast = !!IN6_IS_ADDR_MULTICAST(&IP_AS_V6(*ss, addr));
} else if (use->ai_family == AF_INET) {
ss->ss_family = AF_INET;
IP_AS_V4(*ss, port) = htons(port);
IP_AS_V4(*ss, addr) = ((struct sockaddr_in *)use->ai_addr)->sin_addr;
*multicast = !!IN_MULTICAST(ntohl(IP_AS_V4(*ss, addr.s_addr)));
}
freeaddrinfo(ressave);
if (ss->ss_family != AF_INET && ss->ss_family != AF_INET6) {
tvherror(uc->subsystem, "%s - failed to process host '%s'", uc->name, uc->host);
return -1;
}
return 0;
}
udp_connection_t *
udp_bind ( int subsystem, const char *name,
const char *bindaddr, int port, const char *multicast_src,
const char *ifname, int rxsize, int txsize )
{
int fd, ifindex, reuse = 1;
udp_connection_t *uc;
char buf[256];
socklen_t addrlen;
uc = calloc(1, sizeof(udp_connection_t));
uc->fd = -1;
uc->host = bindaddr ? strdup(bindaddr) : NULL;
uc->port = port;
uc->ifname = ifname ? strdup(ifname) : NULL;
uc->subsystem = subsystem;
uc->name = name ? strdup(name) : NULL;
uc->rxtxsize = rxsize;
if (udp_resolve(uc, &uc->ip, uc->host, port, &uc->multicast, 1)) {
udp_close(uc);
return UDP_FATAL_ERROR;
}
/* Open socket */
if ((fd = tvh_socket(uc->ip.ss_family, SOCK_DGRAM, 0)) == -1) {
tvherror(subsystem, "%s - failed to create socket [%s]",
name, strerror(errno));
udp_close(uc);
return UDP_FATAL_ERROR;
}
uc->fd = fd;
/* Mark reuse address */
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))) {
tvherror(subsystem, "%s - failed to reuse address for socket [%s]",
name, strerror(errno));
udp_close(uc);
return UDP_FATAL_ERROR;
}
/* Bind to interface */
ifindex = udp_ifindex_required(uc) ? udp_get_ifindex(ifname) : 0;
if (ifindex < 0) {
tvherror(subsystem, "%s - could not find interface %s",
name, ifname);
goto error;
}
/* IPv4 */
if (uc->ip.ss_family == AF_INET) {
/* Bind */
if (bind(fd, (struct sockaddr *)&uc->ip, sizeof(struct sockaddr_in))) {
inet_ntop(AF_INET, &IP_AS_V4(uc->ip, addr), buf, sizeof(buf));
tvherror(subsystem, "%s - cannot bind %s:%hu [e=%s]",
name, buf, ntohs(IP_AS_V4(uc->ip, port)), strerror(errno));
goto error;
}
if (uc->multicast) {
/* Join multicast group */
if (multicast_src && *multicast_src) {
/* Join with specific source address (SSM) */
struct ip_mreq_source ms;
memset(&ms, 0, sizeof(ms));
ms.imr_multiaddr = IP_AS_V4(uc->ip, addr);
/* Note, ip_mreq_source does not support the ifindex parameter,
so we have to resolve to the ip of the interface on all platforms. */
if (udp_get_ifaddr(fd, ifname, &ms.imr_interface) == -1) {
tvherror(subsystem, "%s - cannot find ip address for interface %s [e=%s]",
name, ifname, strerror(errno));
goto error;
}
if (inet_pton(AF_INET, multicast_src, &ms.imr_sourceaddr) < 1) {
tvherror(subsystem, "%s - invalid ipv4 address '%s' specified as multicast source [e=%s]",
name, multicast_src, strerror(errno));
goto error;
}
if (setsockopt(fd, udp_get_solip(), IP_ADD_SOURCE_MEMBERSHIP,
&ms, sizeof(ms)) < 0) {
tvherror(subsystem, "%s - setsockopt IP_ADD_SOURCE_MEMBERSHIP failed [e=%s]",
name, strerror(errno));
goto error;
}
}
else {
/* Standard multicast join (non-SSM) */
#if defined(PLATFORM_DARWIN)
struct ip_mreq m;
#else
struct ip_mreqn m;
#endif
memset(&m, 0, sizeof(m));
m.imr_multiaddr = IP_AS_V4(uc->ip, addr);
#if !defined(PLATFORM_DARWIN)
m.imr_address.s_addr = 0;
m.imr_ifindex = ifindex;
#else
if (udp_get_ifaddr(fd, ifname, &m.imr_interface) == -1) {
tvherror(subsystem, "%s - cannot find ip address for interface %s [e=%s]",
name, ifname, strerror(errno));
goto error;
}
#endif
if (setsockopt(fd, udp_get_solip(), IP_ADD_MEMBERSHIP, &m, sizeof(m))) {
inet_ntop(AF_INET, &m.imr_multiaddr, buf, sizeof(buf));
tvhwarn(subsystem, "%s - cannot join %s [%s]",
name, buf, strerror(errno));
}
}
}
/* Bind to IPv6 group */
} else {
struct ipv6_mreq m;
memset(&m, 0, sizeof(m));
/* Bind */
if (bind(fd, (struct sockaddr *)&uc->ip, sizeof(struct sockaddr_in6))) {
inet_ntop(AF_INET6, &IP_AS_V6(uc->ip, addr), buf, sizeof(buf));
tvherror(subsystem, "%s - cannot bind %s:%hu [e=%s]",
name, buf, ntohs(IP_AS_V6(uc->ip, port)), strerror(errno));
goto error;
}
if (uc->multicast) {
/* Join group */
m.ipv6mr_multiaddr = IP_AS_V6(uc->ip, addr);
m.ipv6mr_interface = ifindex;
#ifdef SOL_IPV6
if (setsockopt(fd, SOL_IPV6, IPV6_ADD_MEMBERSHIP, &m, sizeof(m))) {
inet_ntop(AF_INET, &m.ipv6mr_multiaddr, buf, sizeof(buf));
tvhwarn(subsystem, "%s - cannot join %s [%s]",
name, buf, strerror(errno));
}
#else
tvherror(subsystem, "IPv6 multicast not supported");
goto error;
#endif
}
}
addrlen = sizeof(uc->ip);
if (getsockname(fd, (struct sockaddr *)&uc->ip, &addrlen)) {
tvherror(subsystem, "%s - cannot obtain socket name [%s]",
name, strerror(errno));
goto error;
}
/* Increase/Decrease RX buffer size */
if (rxsize > 0 &&
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rxsize, sizeof(rxsize)) == -1)
tvhwarn(subsystem, "%s - cannot change UDP rx buffer size [%s]",
name, strerror(errno));
/* Increase/Decrease TX buffer size */
if (txsize > 0 &&
setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &txsize, sizeof(txsize)) == -1)
tvhwarn(subsystem, "%s - cannot change UDP tx buffer size [%s]",
name, strerror(errno));
return uc;
error:
udp_close(uc);
return NULL;
}
udp_connection_t *
udp_bind ( const char *subsystem, const char *name,
const char *bindaddr, int port,
const char *ifname, int rxsize )
{
int fd, ifindex, reuse = 1;
udp_connection_t *uc;
char buf[256];
socklen_t addrlen;
uc = calloc(1, sizeof(udp_connection_t));
uc->fd = -1;
uc->host = bindaddr ? strdup(bindaddr) : NULL;
uc->port = port;
uc->ifname = ifname ? strdup(ifname) : NULL;
uc->subsystem = subsystem ? strdup(subsystem) : NULL;
uc->name = name ? strdup(name) : NULL;
uc->rxtxsize = rxsize;
if (udp_resolve(uc, 1) < 0) {
udp_close(uc);
return UDP_FATAL_ERROR;
}
/* Open socket */
if ((fd = tvh_socket(uc->ip.ss_family, SOCK_DGRAM, 0)) == -1) {
tvherror(subsystem, "%s - failed to create socket [%s]",
name, strerror(errno));
udp_close(uc);
return UDP_FATAL_ERROR;
}
/* Mark reuse address */
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
/* Bind to interface */
ifindex = udp_ifindex_required(uc) ? udp_get_ifindex(ifname) : 0;
if (ifindex < 0) {
tvherror(subsystem, "%s - could not find interface %s",
name, ifname);
goto error;
}
/* IPv4 */
if (uc->ip.ss_family == AF_INET) {
#if defined(PLATFORM_DARWIN)
struct ip_mreq m;
#else
struct ip_mreqn m;
#endif
memset(&m, 0, sizeof(m));
/* Bind */
if (bind(fd, (struct sockaddr *)&uc->ip, sizeof(struct sockaddr_in)) == -1) {
inet_ntop(AF_INET, &IP_AS_V4(uc->ip, addr), buf, sizeof(buf));
tvherror(subsystem, "%s - cannot bind %s:%hu [e=%s]",
name, buf, ntohs(IP_AS_V4(uc->ip, port)), strerror(errno));
goto error;
}
if (uc->multicast) {
/* Join group */
m.imr_multiaddr = IP_AS_V4(uc->ip, addr);
#if !defined(PLATFORM_DARWIN)
m.imr_address.s_addr = 0;
m.imr_ifindex = ifindex;
#else
if (udp_get_ifaddr(fd, ifname, &m.imr_interface) == -1) {
tvherror(subsystem, "%s - cannot find ip address for interface %s [e=%s]",
name, ifname, strerror(errno));
goto error;
}
#endif
if (setsockopt(fd, udp_get_solip(), IP_ADD_MEMBERSHIP, &m, sizeof(m))) {
inet_ntop(AF_INET, &m.imr_multiaddr, buf, sizeof(buf));
tvhwarn(subsystem, "%s - cannot join %s [%s]",
name, buf, strerror(errno));
}
}
/* Bind to IPv6 group */
} else {
struct ipv6_mreq m;
memset(&m, 0, sizeof(m));
/* Bind */
if (bind(fd, (struct sockaddr *)&uc->ip, sizeof(struct sockaddr_in6)) == -1) {
inet_ntop(AF_INET6, &IP_AS_V6(uc->ip, addr), buf, sizeof(buf));
tvherror(subsystem, "%s - cannot bind %s:%hu [e=%s]",
name, buf, ntohs(IP_AS_V6(uc->ip, port)), strerror(errno));
goto error;
}
if (uc->multicast) {
/* Join group */
m.ipv6mr_multiaddr = IP_AS_V6(uc->ip, addr);
m.ipv6mr_interface = ifindex;
#ifdef SOL_IPV6
if (setsockopt(fd, SOL_IPV6, IPV6_ADD_MEMBERSHIP, &m, sizeof(m))) {
inet_ntop(AF_INET, &m.ipv6mr_multiaddr, buf, sizeof(buf));
tvhwarn(subsystem, "%s - cannot join %s [%s]",
name, buf, strerror(errno));
}
#else
tvherror(subsystem, "IPv6 multicast not supported");
goto error;
#endif
}
}
addrlen = sizeof(uc->ip);
getsockname(fd, (struct sockaddr *)&uc->ip, &addrlen);
/* Increase RX buffer size */
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rxsize, sizeof(rxsize)) == -1)
tvhwarn(subsystem, "%s - cannot increase UDP rx buffer size [%s]",
name, strerror(errno));
uc->fd = fd;
return uc;
error:
udp_close(uc);
return NULL;
}