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  1. /*
  2.  * RTP network protocol
  3.  * Copyright (c) 2002 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * RTP protocol
  25.  */
  26.  
  27. #include "libavutil/parseutils.h"
  28. #include "libavutil/avstring.h"
  29. #include "avformat.h"
  30. #include "avio_internal.h"
  31. #include "rtp.h"
  32. #include "rtpproto.h"
  33. #include "url.h"
  34.  
  35. #include <stdarg.h>
  36. #include "internal.h"
  37. #include "network.h"
  38. #include "os_support.h"
  39. #include <fcntl.h>
  40. #if HAVE_POLL_H
  41. #include <sys/poll.h>
  42. #endif
  43.  
  44. typedef struct RTPContext {
  45.     URLContext *rtp_hd, *rtcp_hd;
  46.     int rtp_fd, rtcp_fd, nb_ssm_include_addrs, nb_ssm_exclude_addrs;
  47.     struct sockaddr_storage **ssm_include_addrs, **ssm_exclude_addrs;
  48.     int write_to_source;
  49.     struct sockaddr_storage last_rtp_source, last_rtcp_source;
  50.     socklen_t last_rtp_source_len, last_rtcp_source_len;
  51. } RTPContext;
  52.  
  53. /**
  54.  * If no filename is given to av_open_input_file because you want to
  55.  * get the local port first, then you must call this function to set
  56.  * the remote server address.
  57.  *
  58.  * @param h media file context
  59.  * @param uri of the remote server
  60.  * @return zero if no error.
  61.  */
  62.  
  63. int ff_rtp_set_remote_url(URLContext *h, const char *uri)
  64. {
  65.     RTPContext *s = h->priv_data;
  66.     char hostname[256];
  67.     int port, rtcp_port;
  68.     const char *p;
  69.  
  70.     char buf[1024];
  71.     char path[1024];
  72.  
  73.     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
  74.                  path, sizeof(path), uri);
  75.     rtcp_port = port + 1;
  76.  
  77.     p = strchr(uri, '?');
  78.     if (p) {
  79.         if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
  80.             rtcp_port = strtol(buf, NULL, 10);
  81.         }
  82.     }
  83.  
  84.     ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
  85.     ff_udp_set_remote_url(s->rtp_hd, buf);
  86.  
  87.     ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, rtcp_port, "%s", path);
  88.     ff_udp_set_remote_url(s->rtcp_hd, buf);
  89.     return 0;
  90. }
  91.  
  92. static struct addrinfo* rtp_resolve_host(const char *hostname, int port,
  93.                                          int type, int family, int flags)
  94. {
  95.     struct addrinfo hints = { 0 }, *res = 0;
  96.     int error;
  97.     char service[16];
  98.  
  99.     snprintf(service, sizeof(service), "%d", port);
  100.     hints.ai_socktype = type;
  101.     hints.ai_family   = family;
  102.     hints.ai_flags    = flags;
  103.     if ((error = getaddrinfo(hostname, service, &hints, &res))) {
  104.         res = NULL;
  105.         av_log(NULL, AV_LOG_ERROR, "rtp_resolve_host: %s\n", gai_strerror(error));
  106.     }
  107.  
  108.     return res;
  109. }
  110.  
  111. static int compare_addr(const struct sockaddr_storage *a,
  112.                         const struct sockaddr_storage *b)
  113. {
  114.     if (a->ss_family != b->ss_family)
  115.         return 1;
  116.     if (a->ss_family == AF_INET) {
  117.         return (((const struct sockaddr_in *)a)->sin_addr.s_addr !=
  118.                 ((const struct sockaddr_in *)b)->sin_addr.s_addr);
  119.     }
  120.  
  121. #if HAVE_STRUCT_SOCKADDR_IN6
  122.     if (a->ss_family == AF_INET6) {
  123.         const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
  124.         const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;
  125.         return memcmp(s6_addr_a, s6_addr_b, 16);
  126.     }
  127. #endif
  128.     return 1;
  129. }
  130.  
  131. static int get_port(const struct sockaddr_storage *ss)
  132. {
  133.     if (ss->ss_family == AF_INET)
  134.         return ntohs(((const struct sockaddr_in *)ss)->sin_port);
  135. #if HAVE_STRUCT_SOCKADDR_IN6
  136.     if (ss->ss_family == AF_INET6)
  137.         return ntohs(((const struct sockaddr_in6 *)ss)->sin6_port);
  138. #endif
  139.     return 0;
  140. }
  141.  
  142. static void set_port(struct sockaddr_storage *ss, int port)
  143. {
  144.     if (ss->ss_family == AF_INET)
  145.         ((struct sockaddr_in *)ss)->sin_port = htons(port);
  146. #if HAVE_STRUCT_SOCKADDR_IN6
  147.     else if (ss->ss_family == AF_INET6)
  148.         ((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
  149. #endif
  150. }
  151.  
  152. static int rtp_check_source_lists(RTPContext *s, struct sockaddr_storage *source_addr_ptr)
  153. {
  154.     int i;
  155.     if (s->nb_ssm_exclude_addrs) {
  156.         for (i = 0; i < s->nb_ssm_exclude_addrs; i++) {
  157.             if (!compare_addr(source_addr_ptr, s->ssm_exclude_addrs[i]))
  158.                 return 1;
  159.         }
  160.     }
  161.     if (s->nb_ssm_include_addrs) {
  162.         for (i = 0; i < s->nb_ssm_include_addrs; i++) {
  163.             if (!compare_addr(source_addr_ptr, s->ssm_include_addrs[i]))
  164.                 return 0;
  165.         }
  166.         return 1;
  167.     }
  168.     return 0;
  169. }
  170.  
  171. /**
  172.  * add option to url of the form:
  173.  * "http://host:port/path?option1=val1&option2=val2...
  174.  */
  175.  
  176. static av_printf_format(3, 4) void url_add_option(char *buf, int buf_size, const char *fmt, ...)
  177. {
  178.     char buf1[1024];
  179.     va_list ap;
  180.  
  181.     va_start(ap, fmt);
  182.     if (strchr(buf, '?'))
  183.         av_strlcat(buf, "&", buf_size);
  184.     else
  185.         av_strlcat(buf, "?", buf_size);
  186.     vsnprintf(buf1, sizeof(buf1), fmt, ap);
  187.     av_strlcat(buf, buf1, buf_size);
  188.     va_end(ap);
  189. }
  190.  
  191. static void build_udp_url(char *buf, int buf_size,
  192.                           const char *hostname, int port,
  193.                           int local_port, int ttl,
  194.                           int max_packet_size, int connect,
  195.                           const char *include_sources,
  196.                           const char *exclude_sources)
  197. {
  198.     ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
  199.     if (local_port >= 0)
  200.         url_add_option(buf, buf_size, "localport=%d", local_port);
  201.     if (ttl >= 0)
  202.         url_add_option(buf, buf_size, "ttl=%d", ttl);
  203.     if (max_packet_size >=0)
  204.         url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
  205.     if (connect)
  206.         url_add_option(buf, buf_size, "connect=1");
  207.     url_add_option(buf, buf_size, "fifo_size=0");
  208.     if (include_sources && include_sources[0])
  209.         url_add_option(buf, buf_size, "sources=%s", include_sources);
  210.     if (exclude_sources && exclude_sources[0])
  211.         url_add_option(buf, buf_size, "block=%s", exclude_sources);
  212. }
  213.  
  214. static void rtp_parse_addr_list(URLContext *h, char *buf,
  215.                                 struct sockaddr_storage ***address_list_ptr,
  216.                                 int *address_list_size_ptr)
  217. {
  218.     struct addrinfo *ai = NULL;
  219.     struct sockaddr_storage *source_addr;
  220.     char tmp = '\0', *p = buf, *next;
  221.  
  222.     /* Resolve all of the IPs */
  223.  
  224.     while (p && p[0]) {
  225.         next = strchr(p, ',');
  226.  
  227.         if (next) {
  228.             tmp = *next;
  229.             *next = '\0';
  230.         }
  231.  
  232.         ai = rtp_resolve_host(p, 0, SOCK_DGRAM, AF_UNSPEC, 0);
  233.         if (ai) {
  234.             source_addr = av_mallocz(sizeof(struct sockaddr_storage));
  235.             if (!source_addr)
  236.                 break;
  237.  
  238.             memcpy(source_addr, ai->ai_addr, ai->ai_addrlen);
  239.             freeaddrinfo(ai);
  240.             dynarray_add(address_list_ptr, address_list_size_ptr, source_addr);
  241.         } else {
  242.             av_log(h, AV_LOG_WARNING, "Unable to resolve %s\n", p);
  243.         }
  244.  
  245.         if (next) {
  246.             *next = tmp;
  247.             p = next + 1;
  248.         } else {
  249.             p = NULL;
  250.         }
  251.     }
  252. }
  253.  
  254. /**
  255.  * url syntax: rtp://host:port[?option=val...]
  256.  * option: 'ttl=n'            : set the ttl value (for multicast only)
  257.  *         'rtcpport=n'       : set the remote rtcp port to n
  258.  *         'localrtpport=n'   : set the local rtp port to n
  259.  *         'localrtcpport=n'  : set the local rtcp port to n
  260.  *         'pkt_size=n'       : set max packet size
  261.  *         'connect=0/1'      : do a connect() on the UDP socket
  262.  *         'sources=ip[,ip]'  : list allowed source IP addresses
  263.  *         'block=ip[,ip]'    : list disallowed source IP addresses
  264.  *         'write_to_source=0/1' : send packets to the source address of the latest received packet
  265.  * deprecated option:
  266.  *         'localport=n'      : set the local port to n
  267.  *
  268.  * if rtcpport isn't set the rtcp port will be the rtp port + 1
  269.  * if local rtp port isn't set any available port will be used for the local
  270.  * rtp and rtcp ports
  271.  * if the local rtcp port is not set it will be the local rtp port + 1
  272.  */
  273.  
  274. static int rtp_open(URLContext *h, const char *uri, int flags)
  275. {
  276.     RTPContext *s = h->priv_data;
  277.     int rtp_port, rtcp_port,
  278.         ttl, connect,
  279.         local_rtp_port, local_rtcp_port, max_packet_size;
  280.     char hostname[256], include_sources[1024] = "", exclude_sources[1024] = "";
  281.     char buf[1024];
  282.     char path[1024];
  283.     const char *p;
  284.     int i, max_retry_count = 3;
  285.  
  286.     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
  287.                  path, sizeof(path), uri);
  288.     /* extract parameters */
  289.     ttl = -1;
  290.     rtcp_port = rtp_port+1;
  291.     local_rtp_port = -1;
  292.     local_rtcp_port = -1;
  293.     max_packet_size = -1;
  294.     connect = 0;
  295.  
  296.     p = strchr(uri, '?');
  297.     if (p) {
  298.         if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
  299.             ttl = strtol(buf, NULL, 10);
  300.         }
  301.         if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
  302.             rtcp_port = strtol(buf, NULL, 10);
  303.         }
  304.         if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
  305.             local_rtp_port = strtol(buf, NULL, 10);
  306.         }
  307.         if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
  308.             local_rtp_port = strtol(buf, NULL, 10);
  309.         }
  310.         if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
  311.             local_rtcp_port = strtol(buf, NULL, 10);
  312.         }
  313.         if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
  314.             max_packet_size = strtol(buf, NULL, 10);
  315.         }
  316.         if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
  317.             connect = strtol(buf, NULL, 10);
  318.         }
  319.         if (av_find_info_tag(buf, sizeof(buf), "write_to_source", p)) {
  320.             s->write_to_source = strtol(buf, NULL, 10);
  321.         }
  322.         if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
  323.             av_strlcpy(include_sources, buf, sizeof(include_sources));
  324.             rtp_parse_addr_list(h, buf, &s->ssm_include_addrs, &s->nb_ssm_include_addrs);
  325.         }
  326.         if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
  327.             av_strlcpy(exclude_sources, buf, sizeof(exclude_sources));
  328.             rtp_parse_addr_list(h, buf, &s->ssm_exclude_addrs, &s->nb_ssm_exclude_addrs);
  329.         }
  330.     }
  331.  
  332.     for (i = 0;i < max_retry_count;i++) {
  333.         build_udp_url(buf, sizeof(buf),
  334.                       hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
  335.                       connect, include_sources, exclude_sources);
  336.         if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
  337.             goto fail;
  338.         local_rtp_port = ff_udp_get_local_port(s->rtp_hd);
  339.         if(local_rtp_port == 65535) {
  340.             local_rtp_port = -1;
  341.             continue;
  342.         }
  343.         if (local_rtcp_port<0) {
  344.             local_rtcp_port = local_rtp_port + 1;
  345.             build_udp_url(buf, sizeof(buf),
  346.                           hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
  347.                           connect, include_sources, exclude_sources);
  348.             if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) {
  349.                 local_rtp_port = local_rtcp_port = -1;
  350.                 continue;
  351.             }
  352.             break;
  353.         }
  354.         build_udp_url(buf, sizeof(buf),
  355.                       hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
  356.                       connect, include_sources, exclude_sources);
  357.         if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0)
  358.             goto fail;
  359.         break;
  360.     }
  361.  
  362.     /* just to ease handle access. XXX: need to suppress direct handle
  363.        access */
  364.     s->rtp_fd = ffurl_get_file_handle(s->rtp_hd);
  365.     s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd);
  366.  
  367.     h->max_packet_size = s->rtp_hd->max_packet_size;
  368.     h->is_streamed = 1;
  369.     return 0;
  370.  
  371.  fail:
  372.     if (s->rtp_hd)
  373.         ffurl_close(s->rtp_hd);
  374.     if (s->rtcp_hd)
  375.         ffurl_close(s->rtcp_hd);
  376.     return AVERROR(EIO);
  377. }
  378.  
  379. static int rtp_read(URLContext *h, uint8_t *buf, int size)
  380. {
  381.     RTPContext *s = h->priv_data;
  382.     int len, n, i;
  383.     struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}};
  384.     int poll_delay = h->flags & AVIO_FLAG_NONBLOCK ? 0 : 100;
  385.     struct sockaddr_storage *addrs[2] = { &s->last_rtp_source, &s->last_rtcp_source };
  386.     socklen_t *addr_lens[2] = { &s->last_rtp_source_len, &s->last_rtcp_source_len };
  387.  
  388.     for(;;) {
  389.         if (ff_check_interrupt(&h->interrupt_callback))
  390.             return AVERROR_EXIT;
  391.         n = poll(p, 2, poll_delay);
  392.         if (n > 0) {
  393.             /* first try RTCP, then RTP */
  394.             for (i = 1; i >= 0; i--) {
  395.                 if (!(p[i].revents & POLLIN))
  396.                     continue;
  397.                 *addr_lens[i] = sizeof(*addrs[i]);
  398.                 len = recvfrom(p[i].fd, buf, size, 0,
  399.                                 (struct sockaddr *)addrs[i], addr_lens[i]);
  400.                 if (len < 0) {
  401.                     if (ff_neterrno() == AVERROR(EAGAIN) ||
  402.                         ff_neterrno() == AVERROR(EINTR))
  403.                         continue;
  404.                     return AVERROR(EIO);
  405.                 }
  406.                 if (rtp_check_source_lists(s, addrs[i]))
  407.                     continue;
  408.                 return len;
  409.             }
  410.         } else if (n < 0) {
  411.             if (ff_neterrno() == AVERROR(EINTR))
  412.                 continue;
  413.             return AVERROR(EIO);
  414.         }
  415.         if (h->flags & AVIO_FLAG_NONBLOCK)
  416.             return AVERROR(EAGAIN);
  417.     }
  418.     return len;
  419. }
  420.  
  421. static int rtp_write(URLContext *h, const uint8_t *buf, int size)
  422. {
  423.     RTPContext *s = h->priv_data;
  424.     int ret;
  425.     URLContext *hd;
  426.  
  427.     if (size < 2)
  428.         return AVERROR(EINVAL);
  429.  
  430.     if (s->write_to_source) {
  431.         int fd;
  432.         struct sockaddr_storage *source, temp_source;
  433.         socklen_t *source_len, temp_len;
  434.         if (!s->last_rtp_source.ss_family && !s->last_rtcp_source.ss_family) {
  435.             av_log(h, AV_LOG_ERROR,
  436.                    "Unable to send packet to source, no packets received yet\n");
  437.             // Intentionally not returning an error here
  438.             return size;
  439.         }
  440.  
  441.         if (RTP_PT_IS_RTCP(buf[1])) {
  442.             fd = s->rtcp_fd;
  443.             source     = &s->last_rtcp_source;
  444.             source_len = &s->last_rtcp_source_len;
  445.         } else {
  446.             fd = s->rtp_fd;
  447.             source     = &s->last_rtp_source;
  448.             source_len = &s->last_rtp_source_len;
  449.         }
  450.         if (!source->ss_family) {
  451.             source      = &temp_source;
  452.             source_len  = &temp_len;
  453.             if (RTP_PT_IS_RTCP(buf[1])) {
  454.                 temp_source = s->last_rtp_source;
  455.                 temp_len    = s->last_rtp_source_len;
  456.                 set_port(source, get_port(source) + 1);
  457.                 av_log(h, AV_LOG_INFO,
  458.                        "Not received any RTCP packets yet, inferring peer port "
  459.                        "from the RTP port\n");
  460.             } else {
  461.                 temp_source = s->last_rtcp_source;
  462.                 temp_len    = s->last_rtcp_source_len;
  463.                 set_port(source, get_port(source) - 1);
  464.                 av_log(h, AV_LOG_INFO,
  465.                        "Not received any RTP packets yet, inferring peer port "
  466.                        "from the RTCP port\n");
  467.             }
  468.         }
  469.  
  470.         if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
  471.             ret = ff_network_wait_fd(fd, 1);
  472.             if (ret < 0)
  473.                 return ret;
  474.         }
  475.         ret = sendto(fd, buf, size, 0, (struct sockaddr *) source,
  476.                      *source_len);
  477.  
  478.         return ret < 0 ? ff_neterrno() : ret;
  479.     }
  480.  
  481.     if (RTP_PT_IS_RTCP(buf[1])) {
  482.         /* RTCP payload type */
  483.         hd = s->rtcp_hd;
  484.     } else {
  485.         /* RTP payload type */
  486.         hd = s->rtp_hd;
  487.     }
  488.  
  489.     ret = ffurl_write(hd, buf, size);
  490.     return ret;
  491. }
  492.  
  493. static int rtp_close(URLContext *h)
  494. {
  495.     RTPContext *s = h->priv_data;
  496.     int i;
  497.  
  498.     for (i = 0; i < s->nb_ssm_include_addrs; i++)
  499.         av_free(s->ssm_include_addrs[i]);
  500.     av_freep(&s->ssm_include_addrs);
  501.     for (i = 0; i < s->nb_ssm_exclude_addrs; i++)
  502.         av_free(s->ssm_exclude_addrs[i]);
  503.     av_freep(&s->ssm_exclude_addrs);
  504.  
  505.     ffurl_close(s->rtp_hd);
  506.     ffurl_close(s->rtcp_hd);
  507.     return 0;
  508. }
  509.  
  510. /**
  511.  * Return the local rtp port used by the RTP connection
  512.  * @param h media file context
  513.  * @return the local port number
  514.  */
  515.  
  516. int ff_rtp_get_local_rtp_port(URLContext *h)
  517. {
  518.     RTPContext *s = h->priv_data;
  519.     return ff_udp_get_local_port(s->rtp_hd);
  520. }
  521.  
  522. /**
  523.  * Return the local rtcp port used by the RTP connection
  524.  * @param h media file context
  525.  * @return the local port number
  526.  */
  527.  
  528. int ff_rtp_get_local_rtcp_port(URLContext *h)
  529. {
  530.     RTPContext *s = h->priv_data;
  531.     return ff_udp_get_local_port(s->rtcp_hd);
  532. }
  533.  
  534. static int rtp_get_file_handle(URLContext *h)
  535. {
  536.     RTPContext *s = h->priv_data;
  537.     return s->rtp_fd;
  538. }
  539.  
  540. static int rtp_get_multi_file_handle(URLContext *h, int **handles,
  541.                                      int *numhandles)
  542. {
  543.     RTPContext *s = h->priv_data;
  544.     int *hs       = *handles = av_malloc(sizeof(**handles) * 2);
  545.     if (!hs)
  546.         return AVERROR(ENOMEM);
  547.     hs[0] = s->rtp_fd;
  548.     hs[1] = s->rtcp_fd;
  549.     *numhandles = 2;
  550.     return 0;
  551. }
  552.  
  553. URLProtocol ff_rtp_protocol = {
  554.     .name                      = "rtp",
  555.     .url_open                  = rtp_open,
  556.     .url_read                  = rtp_read,
  557.     .url_write                 = rtp_write,
  558.     .url_close                 = rtp_close,
  559.     .url_get_file_handle       = rtp_get_file_handle,
  560.     .url_get_multi_file_handle = rtp_get_multi_file_handle,
  561.     .priv_data_size            = sizeof(RTPContext),
  562.     .flags                     = URL_PROTOCOL_FLAG_NETWORK,
  563. };
  564.