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 #include <assert.h>
  34
  35 #include "rtp.h"
  36
  37 typedef struct rtsp_session_t rtsp_session_t;
  38
  39 struct rtsp_stream_t
  40 {
  41     vlc_mutex_t     lock;
  42     sout_stream_t  *owner;
  43     httpd_host_t   *host;
  44     httpd_url_t    *url;
  45     char           *psz_control;
  46     char           *psz_path;
  47
  48     int             sessionc;
  49     rtsp_session_t **sessionv;
  50 };
  51
  52
  53 static int  RtspCallback( httpd_callback_sys_t *p_args,
  54                           httpd_client_t *cl,
  55                           httpd_message_t *answer, httpd_message_t *query );
  56 static int  RtspCallbackId( httpd_callback_sys_t *p_args,
  57                             httpd_client_t *cl,
  58                             httpd_message_t *answer, httpd_message_t *query );
  59 static void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session );
  60
  61 rtsp_stream_t *RtspSetup( sout_stream_t *p_stream, const vlc_url_t *url )
  62 {
  63     rtsp_stream_t *rtsp = malloc( sizeof( *rtsp ) );
  64
  65     if( rtsp == NULL )
  66         return NULL;
  67
  68     rtsp->owner = p_stream;
  69     rtsp->sessionc = 0;
  70     rtsp->sessionv = NULL;
  71     vlc_mutex_init( p_stream, &rtsp->lock );
  72
  73     msg_Dbg( p_stream, "rtsp setup: %s : %d / %s\n",
  74              url->psz_host, url->i_port, url->psz_path );
  75
  76     rtsp->psz_path = strdup( url->psz_path ? url->psz_path : "/" );
  77     if( rtsp->psz_path == NULL )
  78         goto error;
  79
  80     if( asprintf( &rtsp->psz_control, "rtsp://%s:%d%s",
  81                   url->psz_host,  url->i_port > 0 ? url->i_port : 554,
  82                   rtsp->psz_path ) == -1 )
  83     {
  84         rtsp->psz_control = NULL;
  85         goto error;
  86     }
  87
  88     rtsp->host = httpd_HostNew( VLC_OBJECT(p_stream), url->psz_host,
  89                                 url->i_port > 0 ? url->i_port : 554 );
  90     if( rtsp->host == NULL )
  91         goto error;
  92
  93     rtsp->url = httpd_UrlNewUnique( rtsp->host, rtsp->psz_path, NULL, NULL,
  94                                     NULL );
  95     if( rtsp->url == NULL )
  96         goto error;
  97
  98     httpd_UrlCatch( rtsp->url, HTTPD_MSG_DESCRIBE, RtspCallback, (void*)rtsp );
  99     httpd_UrlCatch( rtsp->url, HTTPD_MSG_SETUP,    RtspCallback, (void*)rtsp );
 100     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PLAY,     RtspCallback, (void*)rtsp );
 101     httpd_UrlCatch( rtsp->url, HTTPD_MSG_PAUSE,    RtspCallback, (void*)rtsp );
 102     httpd_UrlCatch( rtsp->url, HTTPD_MSG_TEARDOWN, RtspCallback, (void*)rtsp );
 103     return rtsp;
 104
 105 error:
 106     RtspUnsetup( rtsp );
 107     return NULL;
 108 }
 109
 110
 111 void RtspUnsetup( rtsp_stream_t *rtsp )
 112 {
 113     while( rtsp->sessionc > 0 )
 114         RtspClientDel( rtsp, rtsp->sessionv[0] );
 115
 116     if( rtsp->url )
 117         httpd_UrlDelete( rtsp->url );
 118
 119     if( rtsp->host )
 120         httpd_HostDelete( rtsp->host );
 121
 122     vlc_mutex_destroy( &rtsp->lock );
 123 }
 124
 125
 126 struct rtsp_stream_id_t
 127 {
 128     rtsp_stream_t    *stream;
 129     sout_stream_id_t *sout_id;
 130     httpd_url_t      *url;
 131     const char       *dst;
 132     int               ttl;
 133     unsigned          loport, hiport;
 134 };
 135
 136
 137 typedef struct rtsp_strack_t rtsp_strack_t;
 138
 139 /* For unicast streaming */
 140 struct rtsp_session_t
 141 {
 142     rtsp_stream_t *stream;
 143
 144     /* is it in "play" state */
 145     vlc_bool_t     b_playing;
 146
 147     /* output (id-access) */
 148     int            trackc;
 149     rtsp_strack_t *trackv;
 150
 151     char name[0];
 152 };
 153
 154
 155 /* Unicast session track */
 156 struct rtsp_strack_t
 157 {
 158     sout_stream_id_t  *id;
 159     sout_access_out_t *access;
 160     vlc_bool_t         playing;
 161 };
 162
 163
 164 rtsp_stream_id_t *RtspAddId( rtsp_stream_t *rtsp, sout_stream_id_t *sid,
 165                              unsigned num,
 166                              /* Multicast stuff - TODO: cleanup */
 167                              const char *dst, int ttl,
 168                              unsigned loport, unsigned hiport )
 169 {
 170     char urlbuf[strlen( rtsp->psz_control ) + 1 + 10];
 171     rtsp_stream_id_t *id = malloc( sizeof( *id ) );
 172     httpd_url_t *url;
 173
 174     if( id == NULL )
 175         return NULL;
 176
 177     id->stream = rtsp;
 178     id->sout_id = sid;
 179     /* TODO: can we assume that this need not be strdup'd? */
 180     id->dst = dst;
 181     if( id->dst != NULL )
 182     {
 183         id->ttl = ttl;
 184         id->loport = loport;
 185         id->hiport = hiport;
 186     }
 187
 188     sprintf( urlbuf, "%s/trackID=%d", rtsp->psz_path, num );
 189     msg_Dbg( rtsp->owner, "RTSP: adding %s\n", urlbuf );
 190     url = id->url = httpd_UrlNewUnique( rtsp->host, urlbuf, NULL, NULL, NULL );
 191
 192     if( url == NULL )
 193     {
 194         free( id );
 195         return NULL;
 196     }
 197
 198     httpd_UrlCatch( url, HTTPD_MSG_DESCRIBE, RtspCallbackId, (void *)id );
 199     httpd_UrlCatch( url, HTTPD_MSG_SETUP,    RtspCallbackId, (void *)id );
 200     httpd_UrlCatch( url, HTTPD_MSG_PLAY,     RtspCallbackId, (void *)id );
 201     httpd_UrlCatch( url, HTTPD_MSG_PAUSE,    RtspCallbackId, (void *)id );
 202     httpd_UrlCatch( url, HTTPD_MSG_TEARDOWN, RtspCallbackId, (void *)id );
 203
 204     return id;
 205 }
 206
 207
 208 void RtspDelId( rtsp_stream_t *rtsp, rtsp_stream_id_t *id )
 209 {
 210     vlc_mutex_lock( &rtsp->lock );
 211     for( int i = 0; i < rtsp->sessionc; i++ )
 212     {
 213         rtsp_session_t *ses = rtsp->sessionv[i];
 214
 215         for( int j = 0; j < ses->trackc; j++ )
 216         {
 217             if( ses->trackv[j].id == id->sout_id )
 218             {
 219                 rtsp_strack_t *tr = ses->trackv + j;
 220                 sout_AccessOutDelete( tr->access );
 221                 REMOVE_ELEM( ses->trackv, ses->trackc, j );
 222                 /* FIXME: are we supposed to notify the client? */
 223             }
 224         }
 225     }
 226
 227     vlc_mutex_unlock( &rtsp->lock );
 228     httpd_UrlDelete( id->url );
 229     free( id );
 230 }
 231
 232
 233 /** rtsp must be locked */
 234 static
 235 rtsp_session_t *RtspClientNew( rtsp_stream_t *rtsp, const char *name )
 236 {
 237     rtsp_session_t *s = malloc( sizeof( *s ) + strlen( name ) + 1 );
 238
 239     s->stream = rtsp;
 240     s->b_playing = VLC_FALSE;
 241     s->trackc = 0;
 242     s->trackv = NULL;
 243     strcpy( s->name, name );
 244
 245     TAB_APPEND( rtsp->sessionc, rtsp->sessionv, s );
 246
 247     return s;
 248 }
 249
 250
 251 /** rtsp must be locked */
 252 static
 253 rtsp_session_t *RtspClientGet( rtsp_stream_t *rtsp, const char *name )
 254 {
 255     int i;
 256
 257     if( name == NULL )
 258         return NULL;
 259
 260     /* FIXME: use a hash/dictionary */
 261     for( i = 0; i < rtsp->sessionc; i++ )
 262     {
 263         if( !strcmp( rtsp->sessionv[i]->name, name ) )
 264             return rtsp->sessionv[i];
 265     }
 266     return NULL;
 267 }
 268
 269
 270 /** rtsp must be locked */
 271 static
 272 void RtspClientDel( rtsp_stream_t *rtsp, rtsp_session_t *session )
 273 {
 274     int i;
 275     TAB_REMOVE( rtsp->sessionc, rtsp->sessionv, session );
 276
 277     for( i = 0; i < session->trackc; i++ )
 278     {
 279         rtp_del_sink( session->trackv[i].id, session->trackv[i].access );
 280         sout_AccessOutDelete( session->trackv[i].access );
 281     }
 282
 283     free( session->trackv );
 284     free( session );
 285 }
 286
 287
 288 /** Aggregate RTSP callback */
 289 static int RtspCallback( httpd_callback_sys_t *p_args,
 290                          httpd_client_t *cl,
 291                          httpd_message_t *answer, httpd_message_t *query )
 292 {
 293     rtsp_stream_t *rtsp = (rtsp_stream_t *)p_args;
 294     const char *psz_session = NULL, *psz_cseq;
 295
 296     if( answer == NULL || query == NULL )
 297     {
 298         return VLC_SUCCESS;
 299     }
 300     //fprintf( stderr, "RtspCallback query: type=%d\n", query->i_type );
 301
 302     answer->i_proto = HTTPD_PROTO_RTSP;
 303     answer->i_version= query->i_version;
 304     answer->i_type   = HTTPD_MSG_ANSWER;
 305     answer->i_body = 0;
 306     answer->p_body = NULL;
 307
 308     if( httpd_MsgGet( query, "Require" ) != NULL )
 309     {
 310         answer->i_status = 551;
 311         httpd_MsgAdd( query, "Unsupported", "%s",
 312                       httpd_MsgGet( query, "Require" ) );
 313     }
 314     else
 315     switch( query->i_type )
 316     {
 317         case HTTPD_MSG_DESCRIBE:
 318         {
 319             char *psz_sdp = SDPGenerate( rtsp->owner, rtsp->psz_control );
 320
 321             answer->i_status = 200;
 322             httpd_MsgAdd( answer, "Content-Type",  "%s", "application/sdp" );
 323             httpd_MsgAdd( answer, "Content-Base",  "%s", rtsp->psz_control );
 324             answer->p_body = (uint8_t *)psz_sdp;
 325             answer->i_body = strlen( psz_sdp );
 326             break;
 327         }
 328
 329         case HTTPD_MSG_SETUP:
 330             answer->i_status = 459;
 331             break;
 332
 333         case HTTPD_MSG_PLAY:
 334         {
 335             rtsp_session_t *ses;
 336             answer->i_status = 200;
 337
 338             psz_session = httpd_MsgGet( query, "Session" );
 339
 340             vlc_mutex_lock( &rtsp->lock );
 341             ses = RtspClientGet( rtsp, psz_session );
 342             if( ( ses != NULL ) && !ses->b_playing )
 343             {
 344                 /* FIXME */
 345                 ses->b_playing = VLC_TRUE;
 346
 347                 for( int i = 0; i < ses->trackc; i++ )
 348                     rtp_add_sink( ses->trackv[i].id, ses->trackv[i].access );
 349             }
 350             vlc_mutex_unlock( &rtsp->lock );
 351             break;
 352         }
 353
 354         case HTTPD_MSG_PAUSE:
 355             answer->i_status = 405;
 356             httpd_MsgAdd( answer, "Allow", "DESCRIBE, PLAY, TEARDOWN" );
 357             break;
 358
 359         case HTTPD_MSG_TEARDOWN:
 360         {
 361             rtsp_session_t *ses;
 362
 363             /* for now only multicast so easy again */
 364             answer->i_status = 200;
 365
 366             psz_session = httpd_MsgGet( query, "Session" );
 367
 368             vlc_mutex_lock( &rtsp->lock );
 369             ses = RtspClientGet( rtsp, psz_session );
 370             if( ses != NULL )
 371                 RtspClientDel( rtsp, ses );
 372             vlc_mutex_unlock( &rtsp->lock );
 373             break;
 374         }
 375
 376         default:
 377             return VLC_EGENERIC;
 378     }
 379
 380     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 381     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 382     psz_cseq = httpd_MsgGet( query, "Cseq" );
 383     if( psz_cseq )
 384         httpd_MsgAdd( answer, "Cseq", "%s", psz_cseq );
 385     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 386
 387     if( psz_session )
 388         httpd_MsgAdd( answer, "Session", "%s;timeout=5", psz_session );
 389     return VLC_SUCCESS;
 390 }
 391
 392
 393 /** Finds the next transport choice */
 394 static inline const char *transport_next( const char *str )
 395 {
 396     /* Looks for comma */
 397     str = strchr( str, ',' );
 398     if( str == NULL )
 399         return NULL; /* No more transport options */
 400
 401     str++; /* skips comma */
 402     while( strchr( "\r\n\t ", *str ) )
 403         str++;
 404
 405     return (*str) ? str : NULL;
 406 }
 407
 408
 409 /** Finds the next transport parameter */
 410 static inline const char *parameter_next( const char *str )
 411 {
 412     while( strchr( ",;", *str ) == NULL )
 413         str++;
 414
 415     return (*str == ';') ? (str + 1) : NULL;
 416 }
 417
 418
 419 /** Non-aggregate RTSP callback */
 420 static int RtspCallbackId( httpd_callback_sys_t *p_args,
 421                            httpd_client_t *cl,
 422                            httpd_message_t *answer, httpd_message_t *query )
 423 {
 424     rtsp_stream_id_t *id = (rtsp_stream_id_t *)p_args;
 425     rtsp_stream_t    *rtsp = id->stream;
 426     sout_stream_t    *p_stream = id->stream->owner;
 427     char psz_session_init[21];
 428     const char *psz_session;
 429     const char *psz_cseq;
 430
 431     if( answer == NULL || query == NULL )
 432         return VLC_SUCCESS;
 433     //fprintf( stderr, "RtspCallback query: type=%d\n", query->i_type );
 434
 435     /* */
 436     answer->i_proto = HTTPD_PROTO_RTSP;
 437     answer->i_version= query->i_version;
 438     answer->i_type   = HTTPD_MSG_ANSWER;
 439     answer->i_body = 0;
 440     answer->p_body = NULL;
 441
 442     /* Create new session ID if needed */
 443     psz_session = httpd_MsgGet( query, "Session" );
 444     if( psz_session == NULL )
 445     {
 446         /* FIXME: should be somewhat secure randomness */
 447         snprintf( psz_session_init, sizeof(psz_session_init), I64Fu,
 448                   NTPtime64() + rand() );
 449     }
 450
 451     if( httpd_MsgGet( query, "Require" ) != NULL )
 452     {
 453         answer->i_status = 551;
 454         httpd_MsgAdd( query, "Unsupported", "%s",
 455                       httpd_MsgGet( query, "Require" ) );
 456     }
 457     else
 458     switch( query->i_type )
 459     {
 460         case HTTPD_MSG_SETUP:
 461         {
 462             answer->i_status = 461;
 463
 464             for( const char *tpt = httpd_MsgGet( query, "Transport" );
 465                  tpt != NULL;
 466                  tpt = transport_next( tpt ) )
 467             {
 468                 vlc_bool_t b_multicast = VLC_TRUE, b_unsupp = VLC_FALSE;
 469                 unsigned loport = 5004, hiport = 5005; /* from RFC3551 */
 470
 471                 /* Check transport protocol. */
 472                 /* Currently, we only support RTP/AVP over UDP */
 473                 if( strncmp( tpt, "RTP/AVP", 7 ) )
 474                     continue;
 475                 tpt += 7;
 476                 if( strncmp( tpt, "/UDP", 4 ) == 0 )
 477                     tpt += 4;
 478                 if( strchr( ";,", *tpt ) == NULL )
 479                     continue;
 480
 481                 /* Parse transport options */
 482                 for( const char *opt = parameter_next( tpt );
 483                      opt != NULL;
 484                      opt = parameter_next( opt ) )
 485                 {
 486                     if( strncmp( opt, "multicast", 9 ) == 0)
 487                         b_multicast = VLC_TRUE;
 488                     else
 489                     if( strncmp( opt, "unicast", 7 ) == 0 )
 490                         b_multicast = VLC_FALSE;
 491                     else
 492                     if( sscanf( opt, "client_port=%u-%u", &loport, &hiport ) == 2 )
 493                         ;
 494                     else
 495                     if( strncmp( opt, "mode=", 5 ) == 0 )
 496                     {
 497                         if( strncasecmp( opt + 5, "play", 4 )
 498                          && strncasecmp( opt + 5, "\"PLAY\"", 6 ) )
 499                         {
 500                             /* Not playing?! */
 501                             b_unsupp = VLC_TRUE;
 502                             break;
 503                         }
 504                     }
 505                     else
 506                     {
 507                     /*
 508                      * Every other option is unsupported:
 509                      *
 510                      * "source" and "append" are invalid.
 511                      *
 512                      * For multicast, "port", "layers", "ttl" are set by the
 513                      * stream output configuration.
 514                      *
 515                      * For unicast, we do not allow "destination" as it
 516                      * carries a DoS risk, and we decide on "server_port".
 517                      *
 518                      * "interleaved" and "ssrc" are not implemented.
 519                      */
 520                         b_unsupp = VLC_TRUE;
 521                         break;
 522                     }
 523                 }
 524
 525                 if( b_unsupp )
 526                     continue;
 527
 528                 if( b_multicast )
 529                 {
 530                     const char *dst = id->dst;
 531                     if( dst == NULL )
 532                         continue;
 533
 534                     answer->i_status = 200;
 535
 536                     httpd_MsgAdd( answer, "Transport",
 537                                   "RTP/AVP/UDP;destination=%s;port=%u-%u;"
 538                                   "ttl=%d;mode=play",
 539                                   dst, id->loport, id->hiport,
 540                                   ( id->ttl > 0 ) ? id->ttl : 1 );
 541                 }
 542                 else
 543                 {
 544                     char ip[NI_MAXNUMERICHOST], url[NI_MAXNUMERICHOST + 8];
 545                     static const char access[] = "udp{raw,rtcp}";
 546                     rtsp_session_t *ses = NULL;
 547                     rtsp_strack_t track = { id->sout_id, NULL, VLC_FALSE };
 548
 549                     if( httpd_ClientIP( cl, ip ) == NULL )
 550                     {
 551                         answer->i_status = 500;
 552                         continue;
 553                     }
 554
 555                     snprintf( url, sizeof( url ),
 556                               ( strchr( ip, ':' ) != NULL ) ? "[%s]:%d" : "%s:%d",
 557                               ip, loport );
 558
 559                     track.access = sout_AccessOutNew( p_stream->p_sout,
 560                                                       access, url );
 561                     if( track.access == NULL )
 562                     {
 563                         msg_Err( p_stream,
 564                                  "cannot create access output for %s://%s",
 565                                  access, url );
 566                         answer->i_status = 500;
 567                         continue;
 568                     }
 569
 570                     char *src = var_GetNonEmptyString( track.access, "src-addr" );
 571                     int sport = var_GetInteger( track.access, "src-port" );
 572
 573                     vlc_mutex_lock( &rtsp->lock );
 574                     if( psz_session == NULL )
 575                     {
 576                         psz_session = psz_session_init;
 577                         ses = RtspClientNew( rtsp, psz_session );
 578                     }
 579                     else
 580                     {
 581                         /* FIXME: we probably need to remove an access out,
 582                          * if there is already one for the same ID */
 583                         ses = RtspClientGet( rtsp, psz_session );
 584                         if( ses == NULL )
 585                         {
 586                             answer->i_status = 454;
 587                             vlc_mutex_unlock( &rtsp->lock );
 588                             continue;
 589                         }
 590                     }
 591
 592                     INSERT_ELEM( ses->trackv, ses->trackc, ses->trackc, track );
 593                     vlc_mutex_unlock( &rtsp->lock );
 594
 595                     httpd_ServerIP( cl, ip );
 596
 597                     if( ( src != NULL ) && strcmp( src, ip ) )
 598                     {
 599                         /* Specify source IP if it is different from the RTSP
 600                          * control connection server address */
 601                         char *ptr = strchr( src, '%' );
 602                         if( ptr != NULL ) *ptr = '\0'; /* remove scope ID */
 603
 604                         httpd_MsgAdd( answer, "Transport",
 605                                       "RTP/AVP/UDP;unicast;source=%s;"
 606                                       "client_port=%u-%u;server_port=%u-%u;"
 607                                       "mode=play",
 608                                       src, loport, loport + 1, sport, sport + 1 );
 609                     }
 610                     else
 611                     {
 612                         httpd_MsgAdd( answer, "Transport",
 613                                       "RTP/AVP/UDP;unicast;"
 614                                       "client_port=%u-%u;server_port=%u-%u;"
 615                                       "mode=play",
 616                                       loport, loport + 1, sport, sport + 1 );
 617                     }
 618
 619                     answer->i_status = 200;
 620                     free( src );
 621                 }
 622                 break;
 623             }
 624             break;
 625         }
 626
 627         case HTTPD_MSG_PAUSE:
 628             answer->i_status = 405;
 629             httpd_MsgAdd( answer, "Allow", "SETUP, TEARDOWN" );
 630             break;
 631
 632         case HTTPD_MSG_TEARDOWN:
 633         {
 634             rtsp_session_t *ses;
 635
 636             answer->i_status = 200;
 637
 638             psz_session = httpd_MsgGet( query, "Session" );
 639
 640             vlc_mutex_lock( &rtsp->lock );
 641             ses = RtspClientGet( rtsp, psz_session );
 642             if( ses != NULL )
 643             {
 644                 for( int i = 0; i < ses->trackc; i++ )
 645                 {
 646                     if( ses->trackv[i].id == id->sout_id )
 647                     {
 648                         rtp_del_sink( id->sout_id, ses->trackv[i].access );
 649                         sout_AccessOutDelete( ses->trackv[i].access );
 650                         REMOVE_ELEM( ses->trackv, ses->trackc, i );
 651                     }
 652                 }
 653             }
 654             vlc_mutex_unlock( &rtsp->lock );
 655             break;
 656         }
 657
 658         default:
 659             answer->i_status = 460;
 660             break;
 661     }
 662
 663     psz_cseq = httpd_MsgGet( query, "Cseq" );
 664     if( psz_cseq )
 665         httpd_MsgAdd( answer, "Cseq", "%s", psz_cseq );
 666     httpd_MsgAdd( answer, "Server", "%s", PACKAGE_STRING );
 667     httpd_MsgAdd( answer, "Content-Length", "%d", answer->i_body );
 668     httpd_MsgAdd( answer, "Cache-Control", "%s", "no-cache" );
 669
 670     if( psz_session )
 671         httpd_MsgAdd( answer, "Session", "%s"/*;timeout=5*/, psz_session );
 672     return VLC_SUCCESS;
 673 }