mirror of
https://github.com/xenia-project/FFmpeg.git
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75d339e044
Based on an original patch by Stephen D'Angelo <SDAngelo@evertz.com>. Signed-off-by: Martin Storsjö <martin@martin.st>
619 lines
20 KiB
C
619 lines
20 KiB
C
/*
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* UDP prototype streaming system
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* UDP protocol
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*/
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#define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
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#include "avformat.h"
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#include "avio_internal.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/avstring.h"
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#include "internal.h"
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#include "network.h"
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#include "os_support.h"
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#include "url.h"
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#ifndef IPV6_ADD_MEMBERSHIP
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#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
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#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
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#endif
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typedef struct {
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int udp_fd;
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int ttl;
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int buffer_size;
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int is_multicast;
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int local_port;
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int reuse_socket;
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struct sockaddr_storage dest_addr;
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int dest_addr_len;
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int is_connected;
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} UDPContext;
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#define UDP_TX_BUF_SIZE 32768
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#define UDP_MAX_PKT_SIZE 65536
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static void log_net_error(void *ctx, int level, const char* prefix)
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{
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char errbuf[100];
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av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
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av_log(ctx, level, "%s: %s\n", prefix, errbuf);
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}
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static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
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struct sockaddr *addr)
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{
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#ifdef IP_MULTICAST_TTL
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if (addr->sa_family == AF_INET) {
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if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
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return -1;
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}
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}
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#endif
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#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
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if (addr->sa_family == AF_INET6) {
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
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return -1;
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}
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}
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#endif
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return 0;
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}
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static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
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{
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#ifdef IP_ADD_MEMBERSHIP
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if (addr->sa_family == AF_INET) {
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreq.imr_interface.s_addr= INADDR_ANY;
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if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
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return -1;
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}
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}
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#endif
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#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
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if (addr->sa_family == AF_INET6) {
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struct ipv6_mreq mreq6;
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memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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mreq6.ipv6mr_interface= 0;
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
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return -1;
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}
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}
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#endif
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return 0;
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}
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static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
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{
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#ifdef IP_DROP_MEMBERSHIP
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if (addr->sa_family == AF_INET) {
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreq.imr_interface.s_addr= INADDR_ANY;
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if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
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return -1;
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}
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}
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#endif
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#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
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if (addr->sa_family == AF_INET6) {
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struct ipv6_mreq mreq6;
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memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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mreq6.ipv6mr_interface= 0;
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if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
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return -1;
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}
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}
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#endif
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return 0;
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}
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static struct addrinfo* udp_resolve_host(const char *hostname, int port,
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int type, int family, int flags)
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{
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struct addrinfo hints = { 0 }, *res = 0;
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int error;
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char sport[16];
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const char *node = 0, *service = "0";
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if (port > 0) {
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snprintf(sport, sizeof(sport), "%d", port);
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service = sport;
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}
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if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
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node = hostname;
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}
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hints.ai_socktype = type;
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hints.ai_family = family;
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hints.ai_flags = flags;
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if ((error = getaddrinfo(node, service, &hints, &res))) {
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res = NULL;
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av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
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}
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return res;
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}
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static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
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int addr_len, char **sources,
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int nb_sources, int include)
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{
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#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
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/* These ones are available in the microsoft SDK, but don't seem to work
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* as on linux, so just prefer the v4-only approach there for now. */
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int i;
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for (i = 0; i < nb_sources; i++) {
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struct group_source_req mreqs;
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int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
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struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
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SOCK_DGRAM, AF_UNSPEC,
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AI_NUMERICHOST);
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if (!sourceaddr)
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return AVERROR(ENOENT);
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mreqs.gsr_interface = 0;
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memcpy(&mreqs.gsr_group, addr, addr_len);
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memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
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freeaddrinfo(sourceaddr);
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if (setsockopt(sockfd, level,
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include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
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(const void *)&mreqs, sizeof(mreqs)) < 0) {
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if (include)
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
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else
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
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return ff_neterrno();
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}
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}
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#elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
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int i;
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if (addr->sa_family != AF_INET) {
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av_log(NULL, AV_LOG_ERROR,
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"Setting multicast sources only supported for IPv4\n");
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return AVERROR(EINVAL);
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}
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for (i = 0; i < nb_sources; i++) {
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struct ip_mreq_source mreqs;
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struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
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SOCK_DGRAM, AF_UNSPEC,
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AI_NUMERICHOST);
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if (!sourceaddr)
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return AVERROR(ENOENT);
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if (sourceaddr->ai_addr->sa_family != AF_INET) {
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freeaddrinfo(sourceaddr);
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av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
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sources[i]);
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return AVERROR(EINVAL);
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}
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mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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mreqs.imr_interface.s_addr = INADDR_ANY;
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mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
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freeaddrinfo(sourceaddr);
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if (setsockopt(sockfd, IPPROTO_IP,
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include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
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(const void *)&mreqs, sizeof(mreqs)) < 0) {
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if (include)
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
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else
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log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
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return ff_neterrno();
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}
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}
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#else
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return AVERROR(ENOSYS);
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#endif
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return 0;
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}
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static int udp_set_url(struct sockaddr_storage *addr,
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const char *hostname, int port)
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{
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struct addrinfo *res0;
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int addr_len;
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res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
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if (res0 == 0) return AVERROR(EIO);
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memcpy(addr, res0->ai_addr, res0->ai_addrlen);
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addr_len = res0->ai_addrlen;
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freeaddrinfo(res0);
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return addr_len;
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}
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static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
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int *addr_len, const char *localaddr)
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{
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int udp_fd = -1;
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struct addrinfo *res0 = NULL, *res = NULL;
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int family = AF_UNSPEC;
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if (((struct sockaddr *) &s->dest_addr)->sa_family)
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family = ((struct sockaddr *) &s->dest_addr)->sa_family;
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res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
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SOCK_DGRAM, family, AI_PASSIVE);
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if (res0 == 0)
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goto fail;
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for (res = res0; res; res=res->ai_next) {
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udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
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if (udp_fd != -1) break;
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log_net_error(NULL, AV_LOG_ERROR, "socket");
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}
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if (udp_fd < 0)
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goto fail;
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memcpy(addr, res->ai_addr, res->ai_addrlen);
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*addr_len = res->ai_addrlen;
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freeaddrinfo(res0);
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return udp_fd;
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fail:
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if (udp_fd >= 0)
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closesocket(udp_fd);
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if(res0)
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freeaddrinfo(res0);
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return -1;
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}
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static int udp_port(struct sockaddr_storage *addr, int addr_len)
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{
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char sbuf[sizeof(int)*3+1];
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int error;
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if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
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av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
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return -1;
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}
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return strtol(sbuf, NULL, 10);
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}
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/**
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* If no filename is given to av_open_input_file because you want to
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* get the local port first, then you must call this function to set
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* the remote server address.
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*
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* url syntax: udp://host:port[?option=val...]
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* option: 'ttl=n' : set the ttl value (for multicast only)
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* 'localport=n' : set the local port
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* 'pkt_size=n' : set max packet size
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* 'reuse=1' : enable reusing the socket
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*
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* @param h media file context
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* @param uri of the remote server
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* @return zero if no error.
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*/
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int ff_udp_set_remote_url(URLContext *h, const char *uri)
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{
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UDPContext *s = h->priv_data;
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char hostname[256], buf[10];
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int port;
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const char *p;
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av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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/* set the destination address */
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s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
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if (s->dest_addr_len < 0) {
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return AVERROR(EIO);
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}
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s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
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p = strchr(uri, '?');
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if (p) {
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if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
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int was_connected = s->is_connected;
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s->is_connected = strtol(buf, NULL, 10);
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if (s->is_connected && !was_connected) {
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if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
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s->dest_addr_len)) {
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s->is_connected = 0;
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log_net_error(h, AV_LOG_ERROR, "connect");
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return AVERROR(EIO);
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}
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}
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}
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}
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return 0;
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}
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/**
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* Return the local port used by the UDP connection
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* @param h media file context
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* @return the local port number
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*/
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int ff_udp_get_local_port(URLContext *h)
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{
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UDPContext *s = h->priv_data;
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return s->local_port;
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}
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/**
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* Return the udp file handle for select() usage to wait for several RTP
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* streams at the same time.
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* @param h media file context
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*/
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static int udp_get_file_handle(URLContext *h)
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{
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UDPContext *s = h->priv_data;
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return s->udp_fd;
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}
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|
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/* put it in UDP context */
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/* return non zero if error */
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static int udp_open(URLContext *h, const char *uri, int flags)
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{
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char hostname[1024], localaddr[1024] = "";
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int port, udp_fd = -1, tmp, bind_ret = -1;
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UDPContext *s = h->priv_data;
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int is_output;
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const char *p;
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char buf[256];
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struct sockaddr_storage my_addr;
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int len;
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int reuse_specified = 0;
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int i, include = 0, num_sources = 0;
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char *sources[32];
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h->is_streamed = 1;
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h->max_packet_size = 1472;
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is_output = !(flags & AVIO_FLAG_READ);
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s->ttl = 16;
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s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
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p = strchr(uri, '?');
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if (p) {
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if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
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char *endptr = NULL;
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s->reuse_socket = strtol(buf, &endptr, 10);
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/* assume if no digits were found it is a request to enable it */
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if (buf == endptr)
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s->reuse_socket = 1;
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reuse_specified = 1;
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
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s->ttl = strtol(buf, NULL, 10);
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
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s->local_port = strtol(buf, NULL, 10);
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
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h->max_packet_size = strtol(buf, NULL, 10);
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
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s->buffer_size = strtol(buf, NULL, 10);
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
|
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s->is_connected = strtol(buf, NULL, 10);
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
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av_strlcpy(localaddr, buf, sizeof(localaddr));
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}
|
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if (av_find_info_tag(buf, sizeof(buf), "sources", p))
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include = 1;
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if (include || av_find_info_tag(buf, sizeof(buf), "block", p)) {
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char *source_start;
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|
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source_start = buf;
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while (1) {
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char *next = strchr(source_start, ',');
|
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if (next)
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*next = '\0';
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sources[num_sources] = av_strdup(source_start);
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if (!sources[num_sources])
|
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goto fail;
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source_start = next + 1;
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num_sources++;
|
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if (num_sources >= FF_ARRAY_ELEMS(sources) || !next)
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break;
|
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}
|
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}
|
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}
|
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|
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/* fill the dest addr */
|
|
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
|
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|
|
/* XXX: fix av_url_split */
|
|
if (hostname[0] == '\0' || hostname[0] == '?') {
|
|
/* only accepts null hostname if input */
|
|
if (!(flags & AVIO_FLAG_READ))
|
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goto fail;
|
|
} else {
|
|
if (ff_udp_set_remote_url(h, uri) < 0)
|
|
goto fail;
|
|
}
|
|
|
|
if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
|
|
s->local_port = port;
|
|
udp_fd = udp_socket_create(s, &my_addr, &len, localaddr);
|
|
if (udp_fd < 0)
|
|
goto fail;
|
|
|
|
/* Follow the requested reuse option, unless it's multicast in which
|
|
* case enable reuse unless explicitly disabled.
|
|
*/
|
|
if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
|
|
s->reuse_socket = 1;
|
|
if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
|
|
goto fail;
|
|
}
|
|
|
|
/* If multicast, try binding the multicast address first, to avoid
|
|
* receiving UDP packets from other sources aimed at the same UDP
|
|
* port. This fails on windows. This makes sending to the same address
|
|
* using sendto() fail, so only do it if we're opened in read-only mode. */
|
|
if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
|
|
bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
|
|
}
|
|
/* bind to the local address if not multicast or if the multicast
|
|
* bind failed */
|
|
/* the bind is needed to give a port to the socket now */
|
|
if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
|
|
log_net_error(h, AV_LOG_ERROR, "bind failed");
|
|
goto fail;
|
|
}
|
|
|
|
len = sizeof(my_addr);
|
|
getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
|
|
s->local_port = udp_port(&my_addr, len);
|
|
|
|
if (s->is_multicast) {
|
|
if (h->flags & AVIO_FLAG_WRITE) {
|
|
/* output */
|
|
if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
|
|
goto fail;
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (is_output) {
|
|
/* limit the tx buf size to limit latency */
|
|
tmp = s->buffer_size;
|
|
if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
|
|
log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
|
|
goto fail;
|
|
}
|
|
} else {
|
|
/* set udp recv buffer size to the largest possible udp packet size to
|
|
* avoid losing data on OSes that set this too low by default. */
|
|
tmp = s->buffer_size;
|
|
if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
|
|
log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
|
|
}
|
|
/* make the socket non-blocking */
|
|
ff_socket_nonblock(udp_fd, 1);
|
|
}
|
|
if (s->is_connected) {
|
|
if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
|
|
log_net_error(h, AV_LOG_ERROR, "connect");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static int udp_read(URLContext *h, uint8_t *buf, int size)
|
|
{
|
|
UDPContext *s = h->priv_data;
|
|
int ret;
|
|
|
|
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
|
|
ret = ff_network_wait_fd(s->udp_fd, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
ret = recv(s->udp_fd, buf, size, 0);
|
|
return ret < 0 ? ff_neterrno() : ret;
|
|
}
|
|
|
|
static int udp_write(URLContext *h, const uint8_t *buf, int size)
|
|
{
|
|
UDPContext *s = h->priv_data;
|
|
int ret;
|
|
|
|
if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
|
|
ret = ff_network_wait_fd(s->udp_fd, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (!s->is_connected) {
|
|
ret = sendto (s->udp_fd, buf, size, 0,
|
|
(struct sockaddr *) &s->dest_addr,
|
|
s->dest_addr_len);
|
|
} else
|
|
ret = send(s->udp_fd, buf, size, 0);
|
|
|
|
return ret < 0 ? ff_neterrno() : ret;
|
|
}
|
|
|
|
static int udp_close(URLContext *h)
|
|
{
|
|
UDPContext *s = h->priv_data;
|
|
|
|
if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
|
|
udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
|
|
closesocket(s->udp_fd);
|
|
return 0;
|
|
}
|
|
|
|
URLProtocol ff_udp_protocol = {
|
|
.name = "udp",
|
|
.url_open = udp_open,
|
|
.url_read = udp_read,
|
|
.url_write = udp_write,
|
|
.url_close = udp_close,
|
|
.url_get_file_handle = udp_get_file_handle,
|
|
.priv_data_size = sizeof(UDPContext),
|
|
.flags = URL_PROTOCOL_FLAG_NETWORK,
|
|
};
|