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udp: Support IGMPv3 source specific multicast and source blocking

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Based on an original patch by Stephen D'Angelo <SDAngelo@evertz.com>.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-06-21 14:19:56 +03:00
parent fa84506177
commit 75d339e044
3 changed files with 127 additions and 1 deletions
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6
configure vendored
View File

@ -1136,6 +1136,8 @@ HAVE_LIST="
strptime
strtok_r
struct_addrinfo
struct_group_source_req
struct_ip_mreq_source
struct_ipv6_mreq
struct_rusage_ru_maxrss
struct_sockaddr_in6
@ -2811,6 +2813,8 @@ fi
if enabled network; then
check_type "sys/types.h sys/socket.h" socklen_t
check_type netdb.h "struct addrinfo"
check_type netinet/in.h "struct group_source_req" -D_BSD_SOURCE
check_type netinet/in.h "struct ip_mreq_source" -D_BSD_SOURCE
check_type netinet/in.h "struct ipv6_mreq" -D_DARWIN_C_SOURCE
check_type netinet/in.h "struct sockaddr_in6"
check_type "sys/types.h sys/socket.h" "struct sockaddr_storage"
@ -2826,6 +2830,8 @@ if enabled network; then
network_extralibs="-lws2_32"; }
check_type ws2tcpip.h socklen_t
check_type ws2tcpip.h "struct addrinfo"
check_type ws2tcpip.h "struct group_source_req"
check_type ws2tcpip.h "struct ip_mreq_source"
check_type ws2tcpip.h "struct ipv6_mreq"
check_type ws2tcpip.h "struct sockaddr_in6"
check_type ws2tcpip.h "struct sockaddr_storage"

8
doc/protocols.texi
View File

@ -536,6 +536,14 @@ and makes writes return with AVERROR(ECONNREFUSED) if "destination
unreachable" is received.
For receiving, this gives the benefit of only receiving packets from
the specified peer address/port.
@item sources=@var{address}[,@var{address}]
Only receive packets sent to the multicast group from one of the
specified sender IP addresses.
@item block=@var{address}[,@var{address}]
Ignore packets sent to the multicast group from the specified
sender IP addresses.
@end table
Some usage examples of the udp protocol with @command{avconv} follow.

112
libavformat/udp.c
View File

@ -168,6 +168,79 @@ static struct addrinfo* udp_resolve_host(const char *hostname, int port,
return res;
}
static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
int addr_len, char **sources,
int nb_sources, int include)
{
#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
/* 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;
struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
SOCK_DGRAM, AF_UNSPEC,
AI_NUMERICHOST);
if (!sourceaddr)
return AVERROR(ENOENT);
mreqs.gsr_interface = 0;
memcpy(&mreqs.gsr_group, addr, addr_len);
memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
freeaddrinfo(sourceaddr);
if (setsockopt(sockfd, level,
include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
(const void *)&mreqs, sizeof(mreqs)) < 0) {
if (include)
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
else
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) {
av_log(NULL, AV_LOG_ERROR,
"Setting multicast sources only supported for IPv4\n");
return AVERROR(EINVAL);
}
for (i = 0; i < nb_sources; i++) {
struct ip_mreq_source mreqs;
struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
SOCK_DGRAM, AF_UNSPEC,
AI_NUMERICHOST);
if (!sourceaddr)
return AVERROR(ENOENT);
if (sourceaddr->ai_addr->sa_family != AF_INET) {
freeaddrinfo(sourceaddr);
av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
sources[i]);
return AVERROR(EINVAL);
}
mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
mreqs.imr_interface.s_addr = INADDR_ANY;
mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
freeaddrinfo(sourceaddr);
if (setsockopt(sockfd, IPPROTO_IP,
include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
(const void *)&mreqs, sizeof(mreqs)) < 0) {
if (include)
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
else
log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
return ff_neterrno();
}
}
#else
return AVERROR(ENOSYS);
#endif
return 0;
}
static int udp_set_url(struct sockaddr_storage *addr,
const char *hostname, int port)
{
@ -318,6 +391,8 @@ static int udp_open(URLContext *h, const char *uri, int flags)
struct sockaddr_storage my_addr;
int len;
int reuse_specified = 0;
int i, include = 0, num_sources = 0;
char *sources[32];
h->is_streamed = 1;
h->max_packet_size = 1472;
@ -355,6 +430,25 @@ static int udp_open(URLContext *h, const char *uri, int flags)
if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
av_strlcpy(localaddr, buf, sizeof(localaddr));
}
if (av_find_info_tag(buf, sizeof(buf), "sources", p))
include = 1;
if (include || av_find_info_tag(buf, sizeof(buf), "block", p)) {
char *source_start;
source_start = buf;
while (1) {
char *next = strchr(source_start, ',');
if (next)
*next = '\0';
sources[num_sources] = av_strdup(source_start);
if (!sources[num_sources])
goto fail;
source_start = next + 1;
num_sources++;
if (num_sources >= FF_ARRAY_ELEMS(sources) || !next)
break;
}
}
}
/* fill the dest addr */
@ -412,8 +506,21 @@ static int udp_open(URLContext *h, const char *uri, int flags)
}
if (h->flags & AVIO_FLAG_READ) {
/* input */
if (num_sources == 0 || !include) {
if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
goto fail;
if (num_sources) {
if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, sources, num_sources, 0) < 0)
goto fail;
}
} else if (include && num_sources) {
if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, sources, num_sources, 1) < 0)
goto fail;
} else {
av_log(NULL, AV_LOG_ERROR, "invalid udp settings: inclusive multicast but no sources given\n");
goto fail;
}
}
}
@ -441,11 +548,16 @@ static int udp_open(URLContext *h, const char *uri, int flags)
}
}
for (i = 0; i < num_sources; i++)
av_free(sources[i]);
s->udp_fd = udp_fd;
return 0;
fail:
if (udp_fd >= 0)
closesocket(udp_fd);
for (i = 0; i < num_sources; i++)
av_free(sources[i]);
return AVERROR(EIO);
}