| /* |
| * RTP network protocol |
| * Copyright (c) 2002 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * RTP protocol |
| */ |
| |
| #include "libavutil/parseutils.h" |
| #include "libavutil/avstring.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "rtp.h" |
| #include "rtpproto.h" |
| #include "url.h" |
| |
| #include <stdarg.h> |
| #include "internal.h" |
| #include "network.h" |
| #include "os_support.h" |
| #include <fcntl.h> |
| #if HAVE_POLL_H |
| #include <sys/poll.h> |
| #endif |
| |
| typedef struct RTPContext { |
| URLContext *rtp_hd, *rtcp_hd; |
| int rtp_fd, rtcp_fd, nb_ssm_include_addrs, nb_ssm_exclude_addrs; |
| struct sockaddr_storage **ssm_include_addrs, **ssm_exclude_addrs; |
| int write_to_source; |
| struct sockaddr_storage last_rtp_source, last_rtcp_source; |
| socklen_t last_rtp_source_len, last_rtcp_source_len; |
| } RTPContext; |
| |
| /** |
| * If no filename is given to av_open_input_file because you want to |
| * get the local port first, then you must call this function to set |
| * the remote server address. |
| * |
| * @param h media file context |
| * @param uri of the remote server |
| * @return zero if no error. |
| */ |
| |
| int ff_rtp_set_remote_url(URLContext *h, const char *uri) |
| { |
| RTPContext *s = h->priv_data; |
| char hostname[256]; |
| int port, rtcp_port; |
| const char *p; |
| |
| char buf[1024]; |
| char path[1024]; |
| |
| av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, |
| path, sizeof(path), uri); |
| rtcp_port = port + 1; |
| |
| p = strchr(uri, '?'); |
| if (p) { |
| if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) { |
| rtcp_port = strtol(buf, NULL, 10); |
| } |
| } |
| |
| ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path); |
| ff_udp_set_remote_url(s->rtp_hd, buf); |
| |
| ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, rtcp_port, "%s", path); |
| ff_udp_set_remote_url(s->rtcp_hd, buf); |
| return 0; |
| } |
| |
| static struct addrinfo* rtp_resolve_host(const char *hostname, int port, |
| int type, int family, int flags) |
| { |
| struct addrinfo hints = { 0 }, *res = 0; |
| int error; |
| char service[16]; |
| |
| snprintf(service, sizeof(service), "%d", port); |
| hints.ai_socktype = type; |
| hints.ai_family = family; |
| hints.ai_flags = flags; |
| if ((error = getaddrinfo(hostname, service, &hints, &res))) { |
| res = NULL; |
| av_log(NULL, AV_LOG_ERROR, "rtp_resolve_host: %s\n", gai_strerror(error)); |
| } |
| |
| return res; |
| } |
| |
| static int compare_addr(const struct sockaddr_storage *a, |
| const struct sockaddr_storage *b) |
| { |
| if (a->ss_family != b->ss_family) |
| return 1; |
| if (a->ss_family == AF_INET) { |
| return (((const struct sockaddr_in *)a)->sin_addr.s_addr != |
| ((const struct sockaddr_in *)b)->sin_addr.s_addr); |
| } |
| |
| #if HAVE_STRUCT_SOCKADDR_IN6 |
| if (a->ss_family == AF_INET6) { |
| const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr; |
| const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr; |
| return memcmp(s6_addr_a, s6_addr_b, 16); |
| } |
| #endif |
| return 1; |
| } |
| |
| static int get_port(const struct sockaddr_storage *ss) |
| { |
| if (ss->ss_family == AF_INET) |
| return ntohs(((const struct sockaddr_in *)ss)->sin_port); |
| #if HAVE_STRUCT_SOCKADDR_IN6 |
| if (ss->ss_family == AF_INET6) |
| return ntohs(((const struct sockaddr_in6 *)ss)->sin6_port); |
| #endif |
| return 0; |
| } |
| |
| static void set_port(struct sockaddr_storage *ss, int port) |
| { |
| if (ss->ss_family == AF_INET) |
| ((struct sockaddr_in *)ss)->sin_port = htons(port); |
| #if HAVE_STRUCT_SOCKADDR_IN6 |
| else if (ss->ss_family == AF_INET6) |
| ((struct sockaddr_in6 *)ss)->sin6_port = htons(port); |
| #endif |
| } |
| |
| static int rtp_check_source_lists(RTPContext *s, struct sockaddr_storage *source_addr_ptr) |
| { |
| int i; |
| if (s->nb_ssm_exclude_addrs) { |
| for (i = 0; i < s->nb_ssm_exclude_addrs; i++) { |
| if (!compare_addr(source_addr_ptr, s->ssm_exclude_addrs[i])) |
| return 1; |
| } |
| } |
| if (s->nb_ssm_include_addrs) { |
| for (i = 0; i < s->nb_ssm_include_addrs; i++) { |
| if (!compare_addr(source_addr_ptr, s->ssm_include_addrs[i])) |
| return 0; |
| } |
| return 1; |
| } |
| return 0; |
| } |
| |
| /** |
| * add option to url of the form: |
| * "http://host:port/path?option1=val1&option2=val2... |
| */ |
| |
| static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...) |
| { |
| char buf1[1024]; |
| va_list ap; |
| |
| va_start(ap, fmt); |
| if (strchr(buf, '?')) |
| av_strlcat(buf, "&", buf_size); |
| else |
| av_strlcat(buf, "?", buf_size); |
| vsnprintf(buf1, sizeof(buf1), fmt, ap); |
| av_strlcat(buf, buf1, buf_size); |
| va_end(ap); |
| } |
| |
| static void build_udp_url(char *buf, int buf_size, |
| const char *hostname, int port, |
| int local_port, int ttl, |
| int max_packet_size, int connect, |
| int dscp, |
| const char *include_sources, |
| const char *exclude_sources) |
| { |
| ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL); |
| if (local_port >= 0) |
| url_add_option(buf, buf_size, "localport=%d", local_port); |
| if (ttl >= 0) |
| url_add_option(buf, buf_size, "ttl=%d", ttl); |
| if (max_packet_size >=0) |
| url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size); |
| if (connect) |
| url_add_option(buf, buf_size, "connect=1"); |
| if (dscp >= 0) |
| url_add_option(buf, buf_size, "dscp=%d", dscp); |
| url_add_option(buf, buf_size, "fifo_size=0"); |
| if (include_sources && include_sources[0]) |
| url_add_option(buf, buf_size, "sources=%s", include_sources); |
| if (exclude_sources && exclude_sources[0]) |
| url_add_option(buf, buf_size, "block=%s", exclude_sources); |
| } |
| |
| static void rtp_parse_addr_list(URLContext *h, char *buf, |
| struct sockaddr_storage ***address_list_ptr, |
| int *address_list_size_ptr) |
| { |
| struct addrinfo *ai = NULL; |
| struct sockaddr_storage *source_addr; |
| char tmp = '\0', *p = buf, *next; |
| |
| /* Resolve all of the IPs */ |
| |
| while (p && p[0]) { |
| next = strchr(p, ','); |
| |
| if (next) { |
| tmp = *next; |
| *next = '\0'; |
| } |
| |
| ai = rtp_resolve_host(p, 0, SOCK_DGRAM, AF_UNSPEC, 0); |
| if (ai) { |
| source_addr = av_mallocz(sizeof(struct sockaddr_storage)); |
| if (!source_addr) { |
| freeaddrinfo(ai); |
| break; |
| } |
| |
| memcpy(source_addr, ai->ai_addr, ai->ai_addrlen); |
| freeaddrinfo(ai); |
| dynarray_add(address_list_ptr, address_list_size_ptr, source_addr); |
| } else { |
| av_log(h, AV_LOG_WARNING, "Unable to resolve %s\n", p); |
| } |
| |
| if (next) { |
| *next = tmp; |
| p = next + 1; |
| } else { |
| p = NULL; |
| } |
| } |
| } |
| |
| /** |
| * url syntax: rtp://host:port[?option=val...] |
| * option: 'ttl=n' : set the ttl value (for multicast only) |
| * 'rtcpport=n' : set the remote rtcp port to n |
| * 'localrtpport=n' : set the local rtp port to n |
| * 'localrtcpport=n' : set the local rtcp port to n |
| * 'pkt_size=n' : set max packet size |
| * 'connect=0/1' : do a connect() on the UDP socket |
| * 'sources=ip[,ip]' : list allowed source IP addresses |
| * 'block=ip[,ip]' : list disallowed source IP addresses |
| * 'write_to_source=0/1' : send packets to the source address of the latest received packet |
| * 'dscp=n' : set DSCP value to n (QoS) |
| * deprecated option: |
| * 'localport=n' : set the local port to n |
| * |
| * if rtcpport isn't set the rtcp port will be the rtp port + 1 |
| * if local rtp port isn't set any available port will be used for the local |
| * rtp and rtcp ports |
| * if the local rtcp port is not set it will be the local rtp port + 1 |
| */ |
| |
| static int rtp_open(URLContext *h, const char *uri, int flags) |
| { |
| RTPContext *s = h->priv_data; |
| int rtp_port, rtcp_port, |
| ttl, connect, |
| local_rtp_port, local_rtcp_port, max_packet_size, dscp; |
| char hostname[256], include_sources[1024] = "", exclude_sources[1024] = ""; |
| char buf[1024]; |
| char path[1024]; |
| const char *p; |
| int i, max_retry_count = 3; |
| |
| av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port, |
| path, sizeof(path), uri); |
| /* extract parameters */ |
| ttl = -1; |
| rtcp_port = rtp_port+1; |
| local_rtp_port = -1; |
| local_rtcp_port = -1; |
| max_packet_size = -1; |
| connect = 0; |
| dscp = -1; |
| |
| p = strchr(uri, '?'); |
| if (p) { |
| if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) { |
| ttl = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) { |
| rtcp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "localport", p)) { |
| local_rtp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) { |
| local_rtp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) { |
| local_rtcp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) { |
| max_packet_size = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { |
| connect = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "write_to_source", p)) { |
| s->write_to_source = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "dscp", p)) { |
| dscp = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "sources", p)) { |
| av_strlcpy(include_sources, buf, sizeof(include_sources)); |
| rtp_parse_addr_list(h, buf, &s->ssm_include_addrs, &s->nb_ssm_include_addrs); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "block", p)) { |
| av_strlcpy(exclude_sources, buf, sizeof(exclude_sources)); |
| rtp_parse_addr_list(h, buf, &s->ssm_exclude_addrs, &s->nb_ssm_exclude_addrs); |
| } |
| } |
| |
| for (i = 0;i < max_retry_count;i++) { |
| build_udp_url(buf, sizeof(buf), |
| hostname, rtp_port, local_rtp_port, ttl, max_packet_size, |
| connect, dscp, include_sources, exclude_sources); |
| if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) |
| goto fail; |
| local_rtp_port = ff_udp_get_local_port(s->rtp_hd); |
| if(local_rtp_port == 65535) { |
| local_rtp_port = -1; |
| continue; |
| } |
| if (local_rtcp_port<0) { |
| local_rtcp_port = local_rtp_port + 1; |
| build_udp_url(buf, sizeof(buf), |
| hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size, |
| connect, dscp, include_sources, exclude_sources); |
| if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) { |
| local_rtp_port = local_rtcp_port = -1; |
| continue; |
| } |
| break; |
| } |
| build_udp_url(buf, sizeof(buf), |
| hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size, |
| connect, dscp, include_sources, exclude_sources); |
| if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) |
| goto fail; |
| break; |
| } |
| |
| /* just to ease handle access. XXX: need to suppress direct handle |
| access */ |
| s->rtp_fd = ffurl_get_file_handle(s->rtp_hd); |
| s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd); |
| |
| h->max_packet_size = s->rtp_hd->max_packet_size; |
| h->is_streamed = 1; |
| return 0; |
| |
| fail: |
| if (s->rtp_hd) |
| ffurl_close(s->rtp_hd); |
| if (s->rtcp_hd) |
| ffurl_close(s->rtcp_hd); |
| return AVERROR(EIO); |
| } |
| |
| static int rtp_read(URLContext *h, uint8_t *buf, int size) |
| { |
| RTPContext *s = h->priv_data; |
| int len, n, i; |
| struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}}; |
| int poll_delay = h->flags & AVIO_FLAG_NONBLOCK ? 0 : 100; |
| struct sockaddr_storage *addrs[2] = { &s->last_rtp_source, &s->last_rtcp_source }; |
| socklen_t *addr_lens[2] = { &s->last_rtp_source_len, &s->last_rtcp_source_len }; |
| |
| for(;;) { |
| if (ff_check_interrupt(&h->interrupt_callback)) |
| return AVERROR_EXIT; |
| n = poll(p, 2, poll_delay); |
| if (n > 0) { |
| /* first try RTCP, then RTP */ |
| for (i = 1; i >= 0; i--) { |
| if (!(p[i].revents & POLLIN)) |
| continue; |
| *addr_lens[i] = sizeof(*addrs[i]); |
| len = recvfrom(p[i].fd, buf, size, 0, |
| (struct sockaddr *)addrs[i], addr_lens[i]); |
| if (len < 0) { |
| if (ff_neterrno() == AVERROR(EAGAIN) || |
| ff_neterrno() == AVERROR(EINTR)) |
| continue; |
| return AVERROR(EIO); |
| } |
| if (rtp_check_source_lists(s, addrs[i])) |
| continue; |
| return len; |
| } |
| } else if (n < 0) { |
| if (ff_neterrno() == AVERROR(EINTR)) |
| continue; |
| return AVERROR(EIO); |
| } |
| if (h->flags & AVIO_FLAG_NONBLOCK) |
| return AVERROR(EAGAIN); |
| } |
| return len; |
| } |
| |
| static int rtp_write(URLContext *h, const uint8_t *buf, int size) |
| { |
| RTPContext *s = h->priv_data; |
| int ret; |
| URLContext *hd; |
| |
| if (size < 2) |
| return AVERROR(EINVAL); |
| |
| if (s->write_to_source) { |
| int fd; |
| struct sockaddr_storage *source, temp_source; |
| socklen_t *source_len, temp_len; |
| if (!s->last_rtp_source.ss_family && !s->last_rtcp_source.ss_family) { |
| av_log(h, AV_LOG_ERROR, |
| "Unable to send packet to source, no packets received yet\n"); |
| // Intentionally not returning an error here |
| return size; |
| } |
| |
| if (RTP_PT_IS_RTCP(buf[1])) { |
| fd = s->rtcp_fd; |
| source = &s->last_rtcp_source; |
| source_len = &s->last_rtcp_source_len; |
| } else { |
| fd = s->rtp_fd; |
| source = &s->last_rtp_source; |
| source_len = &s->last_rtp_source_len; |
| } |
| if (!source->ss_family) { |
| source = &temp_source; |
| source_len = &temp_len; |
| if (RTP_PT_IS_RTCP(buf[1])) { |
| temp_source = s->last_rtp_source; |
| temp_len = s->last_rtp_source_len; |
| set_port(source, get_port(source) + 1); |
| av_log(h, AV_LOG_INFO, |
| "Not received any RTCP packets yet, inferring peer port " |
| "from the RTP port\n"); |
| } else { |
| temp_source = s->last_rtcp_source; |
| temp_len = s->last_rtcp_source_len; |
| set_port(source, get_port(source) - 1); |
| av_log(h, AV_LOG_INFO, |
| "Not received any RTP packets yet, inferring peer port " |
| "from the RTCP port\n"); |
| } |
| } |
| |
| if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
| ret = ff_network_wait_fd(fd, 1); |
| if (ret < 0) |
| return ret; |
| } |
| ret = sendto(fd, buf, size, 0, (struct sockaddr *) source, |
| *source_len); |
| |
| return ret < 0 ? ff_neterrno() : ret; |
| } |
| |
| if (RTP_PT_IS_RTCP(buf[1])) { |
| /* RTCP payload type */ |
| hd = s->rtcp_hd; |
| } else { |
| /* RTP payload type */ |
| hd = s->rtp_hd; |
| } |
| |
| ret = ffurl_write(hd, buf, size); |
| return ret; |
| } |
| |
| static int rtp_close(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| int i; |
| |
| for (i = 0; i < s->nb_ssm_include_addrs; i++) |
| av_free(s->ssm_include_addrs[i]); |
| av_freep(&s->ssm_include_addrs); |
| for (i = 0; i < s->nb_ssm_exclude_addrs; i++) |
| av_free(s->ssm_exclude_addrs[i]); |
| av_freep(&s->ssm_exclude_addrs); |
| |
| ffurl_close(s->rtp_hd); |
| ffurl_close(s->rtcp_hd); |
| return 0; |
| } |
| |
| /** |
| * Return the local rtp port used by the RTP connection |
| * @param h media file context |
| * @return the local port number |
| */ |
| |
| int ff_rtp_get_local_rtp_port(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| return ff_udp_get_local_port(s->rtp_hd); |
| } |
| |
| /** |
| * Return the local rtcp port used by the RTP connection |
| * @param h media file context |
| * @return the local port number |
| */ |
| |
| int ff_rtp_get_local_rtcp_port(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| return ff_udp_get_local_port(s->rtcp_hd); |
| } |
| |
| static int rtp_get_file_handle(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| return s->rtp_fd; |
| } |
| |
| static int rtp_get_multi_file_handle(URLContext *h, int **handles, |
| int *numhandles) |
| { |
| RTPContext *s = h->priv_data; |
| int *hs = *handles = av_malloc(sizeof(**handles) * 2); |
| if (!hs) |
| return AVERROR(ENOMEM); |
| hs[0] = s->rtp_fd; |
| hs[1] = s->rtcp_fd; |
| *numhandles = 2; |
| return 0; |
| } |
| |
| URLProtocol ff_rtp_protocol = { |
| .name = "rtp", |
| .url_open = rtp_open, |
| .url_read = rtp_read, |
| .url_write = rtp_write, |
| .url_close = rtp_close, |
| .url_get_file_handle = rtp_get_file_handle, |
| .url_get_multi_file_handle = rtp_get_multi_file_handle, |
| .priv_data_size = sizeof(RTPContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| }; |
