git.sesse.net Git - vlc/blob - modules/stream_out/rtsp.c

   1 /*****************************************************************************
   2  * rtsp.c: RTSP support for RTP stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2003-2007 the VideoLAN team
   5  * $Id: rtp.c 21407 2007-08-22 20:10:41Z courmisch $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc_sout.h>
  29
  30 #include <vlc_httpd.h>
  31 #include <vlc_url.h>
  32 #include <vlc_network.h>
  33
  34 #include "rtp.h"
  35
  36 /* For unicast/interleaved streaming */
  37 struct rtsp_client_t
  38 {
  39     char    *psz_session;
  40     int64_t i_last; /* for timeout */
  41
  42     /* is it in "play" state */
  43     vlc_bool_t b_playing;
  44
  45     /* output (id-access) */
  46     int               i_id;
  47     sout_stream_id_t  **id;
  48     int               i_access;
  49     sout_access_out_t **access;
  50 };
  51
  52 static int  RtspCallback( httpd_callback_sys_t *p_args,
  53                           httpd_client_t *cl,
  54                           httpd_message_t *answer, httpd_message_t *query );
  55 static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  56                             httpd_client_t *cl,
  57                             httpd_message_t *answer, httpd_message_t *query );
  58 static void RtspClientDel( sout_stream_t *p_stream, rtsp_client_t *rtsp );
  59
  60 int RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  61 {
  62     sout_stream_sys_t *p_sys = p_stream->p_sys;
  63
  64     msg_Dbg( p_stream, "rtsp setup: %s : %d / %s\n", url->psz_host, url->i_port, url->psz_path );
  65
  66     p_sys->p_rtsp_host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host, url->i_port > 0 ? url->i_port : 554 );
  67     if( p_sys->p_rtsp_host == NULL )
  68     {
  69         return VLC_EGENERIC;
  70     }
  71
  72     p_sys->psz_rtsp_path = strdup( url->psz_path ? url->psz_path : "/" );
  73     p_sys->psz_rtsp_control = malloc (strlen( url->psz_host ) + 20 + strlen( p_sys->psz_rtsp_path ) + 1 );
  74     sprintf( p_sys->psz_rtsp_control, "rtsp://%s:%d%s",
  75              url->psz_host,  url->i_port > 0 ? url->i_port : 554, p_sys->psz_rtsp_path );
  76
  77     p_sys->p_rtsp_url = httpd_UrlNewUnique( p_sys->p_rtsp_host, p_sys->psz_rtsp_path, NULL, NULL, NULL );
  78     if( p_sys->p_rtsp_url == NULL )
  79     {
  80         return VLC_EGENERIC;
  81     }
  82     httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)p_stream );
  83     httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_SETUP,    RtspCallback, (void*)p_stream );
  84     httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_PLAY,     RtspCallback, (void*)p_stream );
  85     httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)p_stream );
  86     httpd_UrlCatch( p_sys->p_rtsp_url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)p_stream );
  87
  88     return VLC_SUCCESS;
  89 }
  90
  91
  92 int RtspSetupId( sout_stream_t *p_stream, sout_stream_id_t *id )
  93 {
  94     sout_stream_sys_t *p_sys = p_stream->p_sys;
  95     char psz_urlc[strlen( p_sys->psz_rtsp_control ) + 1 + 10];
  96
  97     sprintf( psz_urlc, "%s/trackID=%d", p_sys->psz_rtsp_path, p_sys->i_es );
  98     msg_Dbg( p_stream, "rtsp: adding %s\n", psz_urlc );
  99     id->p_rtsp_url = httpd_UrlNewUnique( p_sys->p_rtsp_host, psz_urlc, NULL, NULL, NULL );
 100
 101     if( id->p_rtsp_url )
 102     {
 103         httpd_UrlCatch( id->p_rtsp_url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void*)id );
 104         httpd_UrlCatch( id->p_rtsp_url, HTTPD_MSG_SETUP,    RtspCallbackId, (void*)id );
 105         httpd_UrlCatch( id->p_rtsp_url, HTTPD_MSG_PLAY,     RtspCallbackId, (void*)id );
 106         httpd_UrlCatch( id->p_rtsp_url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void*)id );
 107         httpd_UrlCatch( id->p_rtsp_url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void*)id );
 108     }
 109
 110     return VLC_SUCCESS;
 111 }
 112
 113
 114 void RtspUnsetup( sout_stream_t *p_stream )
 115 {
 116     sout_stream_sys_t *p_sys = p_stream->p_sys;
 117     while( p_sys->i_rtsp > 0 )
 118         RtspClientDel( p_stream, p_sys->rtsp[0] );
 119 }
 120
 121
 122 static rtsp_client_t *RtspClientNew( sout_stream_t *p_stream, const char *psz_session )
 123 {
 124     rtsp_client_t *rtsp = malloc( sizeof( rtsp_client_t ));
 125
 126     rtsp->psz_session = strdup( psz_session );
 127     rtsp->i_last = 0;
 128     rtsp->b_playing = VLC_FALSE;
 129     rtsp->i_id = 0;
 130     rtsp->id = NULL;
 131     rtsp->i_access = 0;
 132     rtsp->access = NULL;
 133
 134     TAB_APPEND( p_stream->p_sys->i_rtsp, p_stream->p_sys->rtsp, rtsp );
 135
 136     return rtsp;
 137 }
 138
 139
 140 static rtsp_client_t *RtspClientGet( sout_stream_t *p_stream, const char *psz_session )
 141 {
 142     int i;
 143
 144     if( !psz_session ) return NULL;
 145
 146     for( i = 0; i < p_stream->p_sys->i_rtsp; i++ )
 147     {
 148         if( !strcmp( p_stream->p_sys->rtsp[i]->psz_session, psz_session ) )
 149         {
 150             return p_stream->p_sys->rtsp[i];
 151         }
 152     }
 153     return NULL;
 154 }
 155
 156
 157 static void RtspClientDel( sout_stream_t *p_stream, rtsp_client_t *rtsp )
 158 {
 159     int i;
 160     TAB_REMOVE( p_stream->p_sys->i_rtsp, p_stream->p_sys->rtsp, rtsp );
 161
 162     for( i = 0; i < rtsp->i_access; i++ )
 163     {
 164         sout_AccessOutDelete( rtsp->access[i] );
 165     }
 166     if( rtsp->id )     free( rtsp->id );
 167     if( rtsp->access ) free( rtsp->access );
 168
 169     free( rtsp->psz_session );
 170     free( rtsp );
 171 }
 172
 173
 174 /** Aggregate RTSP callback */
 175 static int  RtspCallback( httpd_callback_sys_t *p_args,
 176                           httpd_client_t *cl,
 177                           httpd_message_t *answer, httpd_message_t *query )
 178 {
 179     sout_stream_t *p_stream = (sout_stream_t*)p_args;
 180     sout_stream_sys_t *p_sys = p_stream->p_sys;
 181     char *psz_destination = p_sys->psz_destination;
 182     const char *psz_session = NULL;
 183     const char *psz_cseq = NULL;
 184
 185     if( answer == NULL || query == NULL )
 186     {
 187         return VLC_SUCCESS;
 188     }
 189     //fprintf( stderr, "RtspCallback query: type=%d\n", query->i_type );
 190
 191     answer->i_proto = HTTPD_PROTO_RTSP;
 192     answer->i_version= query->i_version;
 193     answer->i_type   = HTTPD_MSG_ANSWER;
 194     answer->i_body = 0;
 195     answer->p_body = NULL;
 196
 197     if( httpd_MsgGet( query, "Require" ) != NULL )
 198     {
 199         answer->i_status = 551;
 200         httpd_MsgAdd( query, "Unsupported", "%s",
 201                       httpd_MsgGet( query, "Require" ) );
 202     }
 203     else
 204     switch( query->i_type )
 205     {
 206         case HTTPD_MSG_DESCRIBE:
 207         {
 208             char *psz_sdp = SDPGenerate( p_stream, psz_destination, VLC_TRUE );
 209
 210             answer->i_status = 200;
 211             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 212             httpd_MsgAdd( answer, "Content-Base",  "%s", p_sys->psz_rtsp_control );
 213             answer->p_body = (uint8_t *)psz_sdp;
 214             answer->i_body = strlen( psz_sdp );
 215             break;
 216         }
 217
 218         case HTTPD_MSG_SETUP:
 219             answer->i_status = 459;
 220             break;
 221
 222         case HTTPD_MSG_PLAY:
 223         {
 224             rtsp_client_t *rtsp;
 225             answer->i_status = 200;
 226
 227             psz_session = httpd_MsgGet( query, "Session" );
 228             rtsp = RtspClientGet( p_stream, psz_session );
 229             if( rtsp && !rtsp->b_playing )
 230             {
 231                 int i_id;
 232                 /* FIXME */
 233                 rtsp->b_playing = VLC_TRUE;
 234
 235                 vlc_mutex_lock( &p_sys->lock_es );
 236                 for( i_id = 0; i_id < rtsp->i_id; i_id++ )
 237                 {
 238                     sout_stream_id_t *id = rtsp->id[i_id];
 239                     int i;
 240
 241                     for( i = 0; i < p_sys->i_es; i++ )
 242                     {
 243                         if( id == p_sys->es[i] )
 244                             break;
 245                     }
 246                     if( i >= p_sys->i_es ) continue;
 247
 248                     rtp_add_sink( id, rtsp->access[i_id] );
 249                 }
 250                 vlc_mutex_unlock( &p_sys->lock_es );
 251             }
 252             break;
 253         }
 254
 255         case HTTPD_MSG_PAUSE:
 256             answer->i_status = 405;
 257             httpd_MsgAdd( answer, "Allow", "DESCRIBE, PLAY, TEARDOWN" );
 258             break;
 259
 260         case HTTPD_MSG_TEARDOWN:
 261         {
 262             rtsp_client_t *rtsp;
 263
 264             /* for now only multicast so easy again */
 265             answer->i_status = 200;
 266
 267             psz_session = httpd_MsgGet( query, "Session" );
 268             rtsp = RtspClientGet( p_stream, psz_session );
 269             if( rtsp )
 270             {
 271                 int i_id;
 272
 273                 vlc_mutex_lock( &p_sys->lock_es );
 274                 for( i_id = 0; i_id < rtsp->i_id; i_id++ )
 275                 {
 276                     sout_stream_id_t *id = rtsp->id[i_id];
 277                     int i;
 278
 279                     for( i = 0; i < p_sys->i_es; i++ )
 280                     {
 281                         if( id == p_sys->es[i] )
 282                             break;
 283                     }
 284                     if( i >= p_sys->i_es ) continue;
 285
 286                     rtp_del_sink( id, rtsp->access[i_id] );
 287                 }
 288                 vlc_mutex_unlock( &p_sys->lock_es );
 289
 290                 RtspClientDel( p_stream, rtsp );
 291             }
 292             break;
 293         }
 294
 295         default:
 296             return VLC_EGENERIC;
 297     }
 298
 299     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 300     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 301     psz_cseq = httpd_MsgGet( query, "Cseq" );
 302     if( psz_cseq )
 303         httpd_MsgAdd( answer, "Cseq", "%s", psz_cseq );
 304     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 305
 306     if( psz_session )
 307         httpd_MsgAdd( answer, "Session", "%s;timeout=5", psz_session );
 308     return VLC_SUCCESS;
 309 }
 310
 311
 312 /** Finds the next transport choice */
 313 static inline const char *transport_next( const char *str )
 314 {
 315     /* Looks for comma */
 316     str = strchr( str, ',' );
 317     if( str == NULL )
 318         return NULL; /* No more transport options */
 319
 320     str++; /* skips comma */
 321     while( strchr( "\r\n\t ", *str ) )
 322         str++;
 323
 324     return (*str) ? str : NULL;
 325 }
 326
 327
 328 /** Finds the next transport parameter */
 329 static inline const char *parameter_next( const char *str )
 330 {
 331     while( strchr( ",;", *str ) == NULL )
 332         str++;
 333
 334     return (*str == ';') ? (str + 1) : NULL;
 335 }
 336
 337
 338 /** Non-aggregate RTSP callback */
 339 /*static*/ int RtspCallbackId( httpd_callback_sys_t *p_args,
 340                                httpd_client_t *cl,
 341                                httpd_message_t *answer, httpd_message_t *query )
 342 {
 343     sout_stream_id_t *id = (sout_stream_id_t*)p_args;
 344     sout_stream_t    *p_stream = id->p_stream;
 345     sout_stream_sys_t *p_sys = p_stream->p_sys;
 346     char psz_session_init[21];
 347     const char *psz_session;
 348     const char *psz_cseq;
 349
 350     if( answer == NULL || query == NULL )
 351         return VLC_SUCCESS;
 352     //fprintf( stderr, "RtspCallback query: type=%d\n", query->i_type );
 353
 354     /* */
 355     answer->i_proto = HTTPD_PROTO_RTSP;
 356     answer->i_version= query->i_version;
 357     answer->i_type   = HTTPD_MSG_ANSWER;
 358     answer->i_body = 0;
 359     answer->p_body = NULL;
 360
 361     /* Create new session ID if needed */
 362     psz_session = httpd_MsgGet( query, "Session" );
 363     if( psz_session == NULL )
 364     {
 365         /* FIXME: should be somewhat secure randomness */
 366         snprintf( psz_session_init, sizeof(psz_session_init), I64Fd,
 367                   NTPtime64() + rand() );
 368     }
 369
 370     if( httpd_MsgGet( query, "Require" ) != NULL )
 371     {
 372         answer->i_status = 551;
 373         httpd_MsgAdd( query, "Unsupported", "%s",
 374                       httpd_MsgGet( query, "Require" ) );
 375     }
 376     else
 377     switch( query->i_type )
 378     {
 379         case HTTPD_MSG_SETUP:
 380         {
 381             answer->i_status = 461;
 382
 383             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 384                  tpt != NULL;
 385                  tpt = transport_next( tpt ) )
 386             {
 387                 vlc_bool_t b_multicast = VLC_TRUE, b_unsupp = VLC_FALSE;
 388                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 389
 390                 /* Check transport protocol. */
 391                 /* Currently, we only support RTP/AVP over UDP */
 392                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 393                     continue;
 394                 tpt += 7;
 395                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 396                     tpt += 4;
 397                 if( strchr( ";,", *tpt ) == NULL )
 398                     continue;
 399
 400                 /* Parse transport options */
 401                 for( const char *opt = parameter_next( tpt );
 402                      opt != NULL;
 403                      opt = parameter_next( opt ) )
 404                 {
 405                     if( strncmp( opt, "multicast", 9 ) == 0)
 406                         b_multicast = VLC_TRUE;
 407                     else
 408                     if( strncmp( opt, "unicast", 7 ) == 0 )
 409                         b_multicast = VLC_FALSE;
 410                     else
 411                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport ) == 2 )
 412                         ;
 413                     else
 414                     if( strncmp( opt, "mode=", 5 ) == 0 )
 415                     {
 416                         if( strncasecmp( opt + 5, "play", 4 )
 417                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 418                         {
 419                             /* Not playing?! */
 420                             b_unsupp = VLC_TRUE;
 421                             break;
 422                         }
 423                     }
 424                     else
 425                     {
 426                     /*
 427                      * Every other option is unsupported:
 428                      *
 429                      * "source" and "append" are invalid.
 430                      *
 431                      * For multicast, "port", "layers", "ttl" are set by the
 432                      * stream output configuration.
 433                      *
 434                      * For unicast, we do not allow "destination" as it
 435                      * carries a DoS risk, and we decide on "server_port".
 436                      *
 437                      * "interleaved" and "ssrc" are not implemented.
 438                      */
 439                         b_unsupp = VLC_TRUE;
 440                         break;
 441                     }
 442                 }
 443
 444                 if( b_unsupp )
 445                     continue;
 446
 447                 if( b_multicast )
 448                 {
 449                     if( p_sys->psz_destination == NULL )
 450                         continue;
 451
 452                     answer->i_status = 200;
 453
 454                     httpd_MsgAdd( answer, "Transport",
 455                                   "RTP/AVP/UDP;destination=%s;port=%d-%d;"
 456                                   "ttl=%d;mode=play",
 457                                   p_sys->psz_destination, id->i_port, id->i_port+1,
 458                                   ( p_sys->i_ttl > 0 ) ? p_sys->i_ttl : 1 );
 459                 }
 460                 else
 461                 {
 462                     char ip[NI_MAXNUMERICHOST], psz_access[22],
 463                          url[NI_MAXNUMERICHOST + 8];
 464                     sout_access_out_t *p_access;
 465                     rtsp_client_t *rtsp = NULL;
 466
 467                     if( ( hiport - loport ) > 1 )
 468                         continue;
 469
 470                     if( psz_session == NULL )
 471                     {
 472                         psz_session = psz_session_init;
 473                         rtsp = RtspClientNew( p_stream, psz_session );
 474                     }
 475                     else
 476                     {
 477                         /* FIXME: we probably need to remove an access out,
 478                          * if there is already one for the same ID */
 479                         rtsp = RtspClientGet( p_stream, psz_session );
 480                         if( rtsp == NULL )
 481                         {
 482                             answer->i_status = 454;
 483                             continue;
 484                         }
 485                     }
 486
 487                     if( httpd_ClientIP( cl, ip ) == NULL )
 488                     {
 489                         answer->i_status = 500;
 490                         continue;
 491                     }
 492
 493                     if( p_sys->i_ttl > 0 )
 494                         snprintf( psz_access, sizeof( psz_access ),
 495                                   "udp{raw,rtcp,ttl=%d}", p_sys->i_ttl );
 496                     else
 497                         strcpy( psz_access, "udp{raw,rtcp}" );
 498
 499                     snprintf( url, sizeof( url ),
 500                               ( strchr( ip, ':' ) != NULL ) ? "[%s]:%d" : "%s:%d",
 501                               ip, loport );
 502
 503                     p_access = sout_AccessOutNew( p_stream->p_sout,
 504                                                   psz_access, url );
 505                     if( p_access == NULL )
 506                     {
 507                         msg_Err( p_stream,
 508                                  "cannot create access output for %s://%s",
 509                                  psz_access, url );
 510                         answer->i_status = 500;
 511                         break;
 512                     }
 513
 514                     TAB_APPEND( rtsp->i_id, rtsp->id, id );
 515                     TAB_APPEND( rtsp->i_access, rtsp->access, p_access );
 516
 517                     char *src = var_GetNonEmptyString (p_access, "src-addr");
 518                     int sport = var_GetInteger (p_access, "src-port");
 519
 520                     httpd_ServerIP( cl, ip );
 521
 522                     if( ( src != NULL ) && strcmp( src, ip ) )
 523                     {
 524                         /* Specify source IP if it is different from the RTSP
 525                          * control connection server address */
 526                         char *ptr = strchr( src, '%' );
 527                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 528
 529                         httpd_MsgAdd( answer, "Transport",
 530                                       "RTP/AVP/UDP;unicast;source=%s;"
 531                                       "client_port=%u-%u;server_port=%u-%u;"
 532                                       "mode=play",
 533                                       src, loport, hiport, sport, sport + 1 );
 534                     }
 535                     else
 536                     {
 537                         httpd_MsgAdd( answer, "Transport",
 538                                       "RTP/AVP/UDP;unicast;"
 539                                       "client_port=%u-%u;server_port=%u-%u;"
 540                                       "mode=play",
 541                                       loport, hiport, sport, sport + 1 );
 542                     }
 543
 544                     answer->i_status = 200;
 545                     free( src );
 546                 }
 547                 break;
 548             }
 549             break;
 550         }
 551
 552         default:
 553             answer->i_status = 460;
 554             break;
 555     }
 556
 557     psz_cseq = httpd_MsgGet( query, "Cseq" );
 558     if( psz_cseq )
 559         httpd_MsgAdd( answer, "Cseq", "%s", psz_cseq );
 560     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 561     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 562     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 563
 564     if( psz_session )
 565         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 566     return VLC_SUCCESS;
 567 }