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avformat/udp: always use IP_ADD_SOURCE_MEMBERSHIP for subscribing to an UDP multicast source group in IPv4 

That alone supports specifying the interface based on its address. Getting the
interface index from the local address seems quite a bit of work in a platform
independent way...

Obviously for IPv6 we still always use MCAST_JOIN_SOURCE_GROUP.

As a side effect this also fixes ticket #7459.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2018-09-21 23:34:50 +02:00
parent d3bda871f0
commit ab0812c1a8
1 changed files with 28 additions and 24 deletions
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52
libavformat/udp.c
View File

@ -246,36 +246,40 @@ static int udp_set_multicast_sources(URLContext *h,
struct sockaddr_storage *sources,
int nb_sources, int include)
{
#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32) && (!defined(TARGET_OS_TV) || !TARGET_OS_TV)
/* These ones are available in the microsoft SDK, but don't seem to work
* as on linux, so just prefer the v4-only approach there for now. */
int i;
for (i = 0; i < nb_sources; i++) {
struct group_source_req mreqs;
int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
//TODO: Interface index should be looked up from local_addr
mreqs.gsr_interface = 0;
memcpy(&mreqs.gsr_group, addr, addr_len);
memcpy(&mreqs.gsr_source, &sources[i], sizeof(*sources));
if (setsockopt(sockfd, level,
include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
(const void *)&mreqs, sizeof(mreqs)) < 0) {
if (include)
ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
else
ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
return ff_neterrno();
}
}
#elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
int i;
if (addr->sa_family != AF_INET) {
#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE)
/* For IPv4 prefer the old approach, as that alone works reliably on
* Windows and it also supports supplying the interface based on its
* address. */
int i;
for (i = 0; i < nb_sources; i++) {
struct group_source_req mreqs;
int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
//TODO: Interface index should be looked up from local_addr
mreqs.gsr_interface = 0;
memcpy(&mreqs.gsr_group, addr, addr_len);
memcpy(&mreqs.gsr_source, &sources[i], sizeof(*sources));
if (setsockopt(sockfd, level,
include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
(const void *)&mreqs, sizeof(mreqs)) < 0) {
if (include)
ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
else
ff_log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
return ff_neterrno();
}
}
return 0;
#else
av_log(NULL, AV_LOG_ERROR,
"Setting multicast sources only supported for IPv4\n");
return AVERROR(EINVAL);
#endif
}
#if HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
for (i = 0; i < nb_sources; i++) {
struct ip_mreq_source mreqs;
if (sources[i].ss_family != AF_INET) {