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

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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
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@ -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) {