libavformat/udp.c

   1 /*
   2  * UDP prototype streaming system
   3  * Copyright (c) 2000, 2001, 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 #include "avformat.h"
  22 #include <unistd.h>
  23 #include "network.h"
  24
  25 #ifndef IPV6_ADD_MEMBERSHIP
  26 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
  27 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
  28 #endif
  29
  30 typedef struct {
  31     int udp_fd;
  32     int ttl;
  33     int is_multicast;
  34     int local_port;
  35     int reuse_socket;
  36 #ifndef CONFIG_IPV6
  37     struct ip_mreq mreq;
  38     struct sockaddr_in dest_addr;
  39 #else
  40     struct sockaddr_storage dest_addr;
  41     size_t dest_addr_len;
  42 #endif
  43 } UDPContext;
  44
  45 #define UDP_TX_BUF_SIZE 32768
  46
  47 #ifdef CONFIG_IPV6
  48
  49 static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
  50     if (addr->sa_family == AF_INET) {
  51         if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
  52             perror("setsockopt(IP_MULTICAST_TTL)");
  53             return -1;
  54         }
  55     }
  56     if (addr->sa_family == AF_INET6) {
  57         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
  58             perror("setsockopt(IPV6_MULTICAST_HOPS)");
  59             return -1;
  60         }
  61     }
  62     return 0;
  63 }
  64
  65 static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
  66     struct ip_mreq   mreq;
  67     struct ipv6_mreq mreq6;
  68     if (addr->sa_family == AF_INET) {
  69         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
  70         mreq.imr_interface.s_addr= INADDR_ANY;
  71         if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
  72             perror("setsockopt(IP_ADD_MEMBERSHIP)");
  73             return -1;
  74         }
  75     }
  76     if (addr->sa_family == AF_INET6) {
  77         memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
  78         mreq6.ipv6mr_interface= 0;
  79         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
  80             perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
  81             return -1;
  82         }
  83     }
  84     return 0;
  85 }
  86
  87 static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
  88     struct ip_mreq   mreq;
  89     struct ipv6_mreq mreq6;
  90     if (addr->sa_family == AF_INET) {
  91         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
  92         mreq.imr_interface.s_addr= INADDR_ANY;
  93         if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
  94             perror("setsockopt(IP_DROP_MEMBERSHIP)");
  95             return -1;
  96         }
  97     }
  98     if (addr->sa_family == AF_INET6) {
  99         memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
 100         mreq6.ipv6mr_interface= 0;
 101         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
 102             perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
 103             return -1;
 104         }
 105     }
 106     return 0;
 107 }
 108
 109 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
 110     struct addrinfo hints, *res = 0;
 111     int error;
 112     char sport[16];
 113     const char *node = 0, *service = 0;
 114
 115     if (port > 0) {
 116         snprintf(sport, sizeof(sport), "%d", port);
 117         service = sport;
 118     }
 119     if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
 120         node = hostname;
 121     }
 122     if ((node) || (service)) {
 123         memset(&hints, 0, sizeof(hints));
 124         hints.ai_socktype = type;
 125         hints.ai_family   = family;
 126         hints.ai_flags = flags;
 127         if ((error = getaddrinfo(node, service, &hints, &res))) {
 128             av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
 129         }
 130     }
 131     return res;
 132 }
 133
 134 static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
 135     UDPContext *s = h->priv_data;
 136     char hostname[256];
 137     int port;
 138     struct addrinfo *res0;
 139     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 140     res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
 141     if (res0 == 0) return AVERROR(EIO);
 142     memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
 143     s->dest_addr_len = res0->ai_addrlen;
 144     freeaddrinfo(res0);
 145     return 0;
 146 }
 147
 148 static int udp_ipv6_set_local(URLContext *h) {
 149     UDPContext *s = h->priv_data;
 150     int udp_fd = -1;
 151     struct sockaddr_storage clientaddr;
 152     socklen_t addrlen;
 153     char sbuf[NI_MAXSERV];
 154     char hbuf[NI_MAXHOST];
 155     struct addrinfo *res0 = NULL, *res = NULL;
 156
 157     if (s->local_port != 0) {
 158         res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
 159         if (res0 == 0)
 160             goto fail;
 161         for (res = res0; res; res=res->ai_next) {
 162             udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
 163             if (udp_fd > 0) break;
 164             perror("socket");
 165         }
 166     } else {
 167         udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
 168         if (udp_fd < 0)
 169             perror("socket");
 170     }
 171
 172     if (udp_fd < 0)
 173         goto fail;
 174
 175     if (s->local_port != 0) {
 176         if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
 177             perror("bind");
 178             goto fail;
 179         }
 180         freeaddrinfo(res0);
 181         res0 = NULL;
 182     }
 183
 184     addrlen = sizeof(clientaddr);
 185     if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
 186         perror("getsockname");
 187         goto fail;
 188     }
 189
 190     if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 191         perror("getnameinfo");
 192         goto fail;
 193     }
 194
 195     s->local_port = strtol(sbuf, NULL, 10);
 196
 197     return udp_fd;
 198
 199  fail:
 200     if (udp_fd >= 0)
 201         closesocket(udp_fd);
 202     if(res0)
 203         freeaddrinfo(res0);
 204     return -1;
 205 }
 206
 207 #endif /* CONFIG_IPV6 */
 208
 209
 210 /**
 211  * If no filename is given to av_open_input_file because you want to
 212  * get the local port first, then you must call this function to set
 213  * the remote server address.
 214  *
 215  * url syntax: udp://host:port[?option=val...]
 216  * option: 'multicast=1' : enable multicast
 217  *         'ttl=n'       : set the ttl value (for multicast only)
 218  *         'localport=n' : set the local port
 219  *         'pkt_size=n'  : set max packet size
 220  *         'reuse=1'     : enable reusing the socket
 221  *
 222  * @param s1 media file context
 223  * @param uri of the remote server
 224  * @return zero if no error.
 225  */
 226 int udp_set_remote_url(URLContext *h, const char *uri)
 227 {
 228 #ifdef CONFIG_IPV6
 229     return udp_ipv6_set_remote_url(h, uri);
 230 #else
 231     UDPContext *s = h->priv_data;
 232     char hostname[256];
 233     int port;
 234
 235     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 236
 237     /* set the destination address */
 238     if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
 239         return AVERROR(EIO);
 240     s->dest_addr.sin_family = AF_INET;
 241     s->dest_addr.sin_port = htons(port);
 242     return 0;
 243 #endif
 244 }
 245
 246 /**
 247  * Return the local port used by the UDP connexion
 248  * @param s1 media file context
 249  * @return the local port number
 250  */
 251 int udp_get_local_port(URLContext *h)
 252 {
 253     UDPContext *s = h->priv_data;
 254     return s->local_port;
 255 }
 256
 257 /**
 258  * Return the udp file handle for select() usage to wait for several RTP
 259  * streams at the same time.
 260  * @param h media file context
 261  */
 262 int udp_get_file_handle(URLContext *h)
 263 {
 264     UDPContext *s = h->priv_data;
 265     return s->udp_fd;
 266 }
 267
 268 /* put it in UDP context */
 269 /* return non zero if error */
 270 static int udp_open(URLContext *h, const char *uri, int flags)
 271 {
 272     char hostname[1024];
 273     int port, udp_fd = -1, tmp;
 274     UDPContext *s = NULL;
 275     int is_output;
 276     const char *p;
 277     char buf[256];
 278 #ifndef CONFIG_IPV6
 279     struct sockaddr_in my_addr, my_addr1;
 280     int len;
 281 #endif
 282
 283     h->is_streamed = 1;
 284     h->max_packet_size = 1472;
 285
 286     is_output = (flags & URL_WRONLY);
 287
 288     s = av_malloc(sizeof(UDPContext));
 289     if (!s)
 290         return AVERROR(ENOMEM);
 291
 292     h->priv_data = s;
 293     s->ttl = 16;
 294     s->is_multicast = 0;
 295     s->local_port = 0;
 296     s->reuse_socket = 0;
 297     p = strchr(uri, '?');
 298     if (p) {
 299         s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
 300         s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
 301         if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
 302             s->ttl = strtol(buf, NULL, 10);
 303         }
 304         if (find_info_tag(buf, sizeof(buf), "localport", p)) {
 305             s->local_port = strtol(buf, NULL, 10);
 306         }
 307         if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
 308             h->max_packet_size = strtol(buf, NULL, 10);
 309         }
 310     }
 311
 312     /* fill the dest addr */
 313     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 314
 315     /* XXX: fix url_split */
 316     if (hostname[0] == '\0' || hostname[0] == '?') {
 317         /* only accepts null hostname if input */
 318         if (s->is_multicast || (flags & URL_WRONLY))
 319             goto fail;
 320     } else {
 321         udp_set_remote_url(h, uri);
 322     }
 323
 324 #ifndef CONFIG_IPV6
 325     udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
 326     if (udp_fd < 0)
 327         goto fail;
 328
 329     my_addr.sin_family = AF_INET;
 330     my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
 331     if (s->is_multicast && !(h->flags & URL_WRONLY)) {
 332         /* special case: the bind must be done on the multicast address port */
 333         my_addr.sin_port = s->dest_addr.sin_port;
 334     } else {
 335         my_addr.sin_port = htons(s->local_port);
 336     }
 337
 338     if (s->reuse_socket)
 339         if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
 340             goto fail;
 341
 342     /* the bind is needed to give a port to the socket now */
 343     if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
 344         goto fail;
 345
 346     len = sizeof(my_addr1);
 347     getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
 348     s->local_port = ntohs(my_addr1.sin_port);
 349
 350 #ifdef IP_MULTICAST_TTL
 351     if (s->is_multicast) {
 352         if (h->flags & URL_WRONLY) {
 353             /* output */
 354             if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
 355                            &s->ttl, sizeof(s->ttl)) < 0) {
 356                 perror("IP_MULTICAST_TTL");
 357                 goto fail;
 358             }
 359         } else {
 360             /* input */
 361             memset(&s->mreq, 0, sizeof(s->mreq));
 362             s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
 363             s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
 364             if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 365                            &s->mreq, sizeof(s->mreq)) < 0) {
 366                 perror("rtp: IP_ADD_MEMBERSHIP");
 367                 goto fail;
 368             }
 369         }
 370     }
 371 #endif
 372 #else
 373     if (s->is_multicast && !(h->flags & URL_WRONLY))
 374         s->local_port = port;
 375     udp_fd = udp_ipv6_set_local(h);
 376     if (udp_fd < 0)
 377         goto fail;
 378     if (s->is_multicast) {
 379         if (h->flags & URL_WRONLY) {
 380             if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
 381                 goto fail;
 382         } else {
 383             if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
 384                 goto fail;
 385         }
 386     }
 387 #endif /* CONFIG_IPV6 */
 388
 389     if (is_output) {
 390         /* limit the tx buf size to limit latency */
 391         tmp = UDP_TX_BUF_SIZE;
 392         if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
 393             perror("setsockopt sndbuf");
 394             goto fail;
 395         }
 396     }
 397
 398     s->udp_fd = udp_fd;
 399     return 0;
 400  fail:
 401     if (udp_fd >= 0)
 402         closesocket(udp_fd);
 403     av_free(s);
 404     return AVERROR(EIO);
 405 }
 406
 407 static int udp_read(URLContext *h, uint8_t *buf, int size)
 408 {
 409     UDPContext *s = h->priv_data;
 410 #ifndef CONFIG_IPV6
 411     struct sockaddr_in from;
 412 #else
 413     struct sockaddr_storage from;
 414 #endif
 415     socklen_t from_len;
 416     int len;
 417
 418     for(;;) {
 419         from_len = sizeof(from);
 420         len = recvfrom (s->udp_fd, buf, size, 0,
 421                         (struct sockaddr *)&from, &from_len);
 422         if (len < 0) {
 423             if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
 424                 ff_neterrno() != FF_NETERROR(EINTR))
 425                 return AVERROR(EIO);
 426         } else {
 427             break;
 428         }
 429     }
 430     return len;
 431 }
 432
 433 static int udp_write(URLContext *h, uint8_t *buf, int size)
 434 {
 435     UDPContext *s = h->priv_data;
 436     int ret;
 437
 438     for(;;) {
 439         ret = sendto (s->udp_fd, buf, size, 0,
 440                       (struct sockaddr *) &s->dest_addr,
 441 #ifndef CONFIG_IPV6
 442                       sizeof (s->dest_addr));
 443 #else
 444                       s->dest_addr_len);
 445 #endif
 446         if (ret < 0) {
 447             if (ff_neterrno() != FF_NETERROR(EINTR) &&
 448                 ff_neterrno() != FF_NETERROR(EAGAIN))
 449                 return AVERROR(EIO);
 450         } else {
 451             break;
 452         }
 453     }
 454     return size;
 455 }
 456
 457 static int udp_close(URLContext *h)
 458 {
 459     UDPContext *s = h->priv_data;
 460
 461 #ifndef CONFIG_IPV6
 462 #ifdef IP_DROP_MEMBERSHIP
 463     if (s->is_multicast && !(h->flags & URL_WRONLY)) {
 464         if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
 465                        &s->mreq, sizeof(s->mreq)) < 0) {
 466             perror("IP_DROP_MEMBERSHIP");
 467         }
 468     }
 469 #endif
 470 #else
 471     if (s->is_multicast && !(h->flags & URL_WRONLY))
 472         udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
 473 #endif
 474     closesocket(s->udp_fd);
 475     av_free(s);
 476     return 0;
 477 }
 478
 479 URLProtocol udp_protocol = {
 480     "udp",
 481     udp_open,
 482     udp_read,
 483     udp_write,
 484     NULL, /* seek */
 485     udp_close,
 486 };