1 /*****************************************************************************
2 * sap.c : SAP interface module
3 *****************************************************************************
4 * Copyright (C) 2004-2005 the VideoLAN team
5 * Copyright © 2007 Rémi Denis-Courmont
8 * Authors: Clément Stenac <zorglub@videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
30 #include <stdlib.h> /* malloc(), free() */
33 #include <vlc_playlist.h>
34 #include <vlc_demux.h>
36 #include <vlc_network.h>
37 #include <vlc_charset.h>
45 #ifdef HAVE_SYS_TIME_H
46 # include <sys/time.h>
54 /************************************************************************
55 * Macros and definitions
56 ************************************************************************/
58 #define MAX_LINE_LENGTH 256
60 /* SAP is always on that port */
62 /* Global-scope SAP address */
63 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
64 /* Organization-local SAP address */
65 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
66 /* Local (smallest non-link-local scope) SAP address */
67 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
68 /* Link-local SAP address */
69 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
72 /*****************************************************************************
74 *****************************************************************************/
75 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
76 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
77 "right addresses to listen to. However, you " \
78 "can specify a specific address." )
79 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
80 #define SAP_IPV4_LONGTEXT N_( \
81 "Listen to IPv4 announcements " \
82 "on the standard address." )
83 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
84 #define SAP_IPV6_LONGTEXT N_( \
85 "Listen to IPv6 announcements " \
86 "on the standard addresses." )
87 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
88 #define SAP_SCOPE_LONGTEXT N_( \
89 "Scope for IPv6 announcements (default is 8)." )
90 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
91 #define SAP_TIMEOUT_LONGTEXT N_( \
92 "Delay after which SAP items get deleted if no new announcement " \
94 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
95 #define SAP_PARSE_LONGTEXT N_( \
96 "This enables actual parsing of the announces by the SAP module. " \
97 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
98 "(RTP/RTSP) module." )
99 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
100 #define SAP_STRICT_LONGTEXT N_( \
101 "When this is set, the SAP parser will discard some non-compliant " \
103 #define SAP_CACHE_TEXT N_("Use SAP cache")
104 #define SAP_CACHE_LONGTEXT N_( \
105 "This enables a SAP caching mechanism. " \
106 "This will result in lower SAP startup time, but you could end up " \
107 "with items corresponding to legacy streams." )
108 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
109 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
110 "for streams discovered through SAP announcements." )
113 static int Open ( vlc_object_t * );
114 static void Close( vlc_object_t * );
115 static int OpenDemux ( vlc_object_t * );
116 static void CloseDemux ( vlc_object_t * );
119 set_shortname( _("SAP"));
120 set_description( _("SAP Announcements") );
121 set_category( CAT_PLAYLIST );
122 set_subcategory( SUBCAT_PLAYLIST_SD );
124 add_string( "sap-addr", NULL, NULL,
125 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
126 add_bool( "sap-ipv4", 1 , NULL,
127 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
128 add_bool( "sap-ipv6", 1 , NULL,
129 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
130 add_integer( "sap-timeout", 1800, NULL,
131 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
132 add_bool( "sap-parse", 1 , NULL,
133 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
134 add_bool( "sap-strict", 0 , NULL,
135 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
137 add_bool( "sap-cache", 0 , NULL,
138 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
140 add_bool( "sap-timeshift", 0 , NULL,
141 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
143 set_capability( "services_discovery", 0 );
144 set_callbacks( Open, Close );
147 set_description( _("SDP file parser for UDP") );
148 add_shortcut( "sdp" );
149 set_capability( "demux2", 51 );
150 set_callbacks( OpenDemux, CloseDemux );
154 /*****************************************************************************
156 *****************************************************************************/
158 typedef struct sdp_t sdp_t;
159 typedef struct attribute_t attribute_t;
160 typedef struct sap_announce_t sap_announce_t;
165 struct sdp_t *parent;
167 struct sockaddr_storage addr;
171 attribute_t **pp_attributes;
175 /* The structure that contains sdp information */
183 uint64_t session_version;
184 unsigned orig_ip_version;
185 char orig_host[1024];
188 char *psz_sessionname;
195 /* a= global attributes */
197 attribute_t **pp_attributes;
199 /* medias (well, we only support one atm) */
201 struct sdp_media_t *mediav;
210 struct sap_announce_t
215 uint32_t i_source[4];
217 /* SAP annnounces must only contain one SDP */
225 struct services_discovery_sys_t
227 /* Socket descriptors */
232 playlist_item_t *p_node_cat;
233 playlist_item_t *p_node_one;
235 /* Table of announces */
237 struct sap_announce_t **pp_announces;
242 vlc_bool_t b_timeshift;
252 /*****************************************************************************
254 *****************************************************************************/
258 static int Demux( demux_t *p_demux );
259 static int Control( demux_t *, int, va_list );
260 static void Run ( services_discovery_t *p_sd );
262 /* Main parsing functions */
263 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
264 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
265 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
266 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
267 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
269 /* Helper functions */
270 static inline attribute_t *MakeAttribute (const char *str);
271 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
272 static inline void FreeAttribute (attribute_t *a);
273 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
276 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
277 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
278 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
279 static void FreeSDP( sdp_t *p_sdp );
281 /*****************************************************************************
282 * Open: initialize and create stuff
283 *****************************************************************************/
284 static int Open( vlc_object_t *p_this )
286 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
287 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
288 malloc( sizeof( services_discovery_sys_t ) );
290 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
298 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
299 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
302 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
308 /* Cache sap_timeshift value */
309 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" )
310 ? VLC_TRUE : VLC_FALSE;
312 /* Create our playlist node */
315 playlist_NodesPairCreate( pl_Get( p_sd ), _("SAP sessions"),
316 &p_sys->p_node_cat, &p_sys->p_node_one,
318 p_sys->p_node_cat->p_input->b_prefers_tree = VLC_TRUE;
319 p_sys->i_announces = 0;
320 p_sys->pp_announces = NULL;
325 /*****************************************************************************
326 * OpenDemux: initialize and create stuff
327 *****************************************************************************/
328 static int OpenDemux( vlc_object_t *p_this )
330 demux_t *p_demux = (demux_t *)p_this;
332 int i_max_sdp = 1024;
334 char *psz_sdp = NULL;
337 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
339 /* We want livedotcom module to parse this SDP file */
346 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 ) return VLC_EGENERIC;
348 if( strncmp( (char*)p_peek, "v=0\r\n", 5 ) &&
349 strncmp( (char*)p_peek, "v=0\n", 4 ) &&
350 ( p_peek[0] < 'a' || p_peek[0] > 'z' || p_peek[1] != '=' ) )
356 psz_sdp = (char *)malloc( i_max_sdp );
357 if( !psz_sdp ) return VLC_EGENERIC;
359 /* Gather the complete sdp file */
362 int i_read = stream_Read( p_demux->s,
363 &psz_sdp[i_sdp], i_max_sdp - i_sdp - 1 );
367 msg_Err( p_demux, "failed to read SDP" );
373 if( i_read < i_max_sdp - i_sdp - 1 )
375 psz_sdp[i_sdp] = '\0';
380 psz_sdp = (char *)realloc( psz_sdp, i_max_sdp );
383 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
387 msg_Warn( p_demux, "invalid SDP");
391 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
393 p_sdp->psz_uri = NULL;
395 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
396 p_sdp->i_media_type != 14 )
399 if( p_sdp->psz_uri == NULL ) goto error;
401 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
402 p_demux->p_sys->p_sdp = p_sdp;
403 p_demux->pf_control = Control;
404 p_demux->pf_demux = Demux;
411 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
412 stream_Seek( p_demux->s, 0 );
416 /*****************************************************************************
418 *****************************************************************************/
419 static void Close( vlc_object_t *p_this )
421 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
422 services_discovery_sys_t *p_sys = p_sd->p_sys;
426 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
428 net_Close( p_sys->pi_fd[i] );
430 FREENULL( p_sys->pi_fd );
433 if( config_GetInt( p_sd, "sap-cache" ) )
439 for( i = p_sys->i_announces - 1; i>= 0; i-- )
441 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
443 FREENULL( p_sys->pp_announces );
445 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_cat, VLC_TRUE,
447 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_one, VLC_TRUE,
453 /*****************************************************************************
454 * CloseDemux: Close the demuxer
455 *****************************************************************************/
456 static void CloseDemux( vlc_object_t *p_this )
458 demux_t *p_demux = (demux_t *)p_this;
461 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
462 free( p_demux->p_sys );
466 /*****************************************************************************
467 * Run: main SAP thread
468 *****************************************************************************
469 * Listens to SAP packets, and sends them to packet_handle
470 *****************************************************************************/
471 #define MAX_SAP_BUFFER 5000
473 static void Run( services_discovery_t *p_sd )
478 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
479 * DNS queries, even if the DNS server returns an error with milliseconds.
480 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
481 * Winsock 1.1 from Windows 95, if not Windows 3.1.
482 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
483 * we have to open sockets in Run() rather than Open(). */
484 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
486 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
487 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
488 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
489 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
491 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
493 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
495 struct if_nameindex *l = if_nameindex ();
498 char *ptr = strchr (psz_address, '%') + 1;
499 for (unsigned i = 0; l[i].if_index; i++)
501 strcpy (ptr, l[i].if_name);
502 InitSocket (p_sd, psz_address, SAP_PORT);
504 if_freenameindex (l);
506 *strchr (psz_address, '%') = '\0';
508 static const char ipv6_scopes[] = "1456789ABCDE";
509 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
511 psz_address[3] = *c_scope;
512 InitSocket( p_sd, psz_address, SAP_PORT );
516 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
517 if( psz_addr && *psz_addr )
519 InitSocket( p_sd, psz_addr, SAP_PORT );
523 if( p_sd->p_sys->i_fd == 0 )
525 msg_Err( p_sd, "unable to listen on any address" );
529 /* read SAP packets */
530 while( !p_sd->b_die )
533 uint8_t p_buffer[MAX_SAP_BUFFER+1];
535 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd,
536 p_sd->p_sys->i_fd, p_buffer,
539 /* Check for items that need deletion */
540 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
542 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
544 if( mdate() - p_sd->p_sys->pp_announces[i]->i_last > i_timeout )
546 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i] );
550 /* Minimum length is > 6 */
555 msg_Warn( p_sd, "socket read error" );
560 p_buffer[i_read] = '\0';
562 /* Parse the packet */
563 ParseSAP( p_sd, p_buffer, i_read );
567 /**********************************************************************
568 * Demux: reads and demuxes data packets
569 * Return -1 if error, 0 if EOF, 1 else
570 **********************************************************************/
571 static int Demux( demux_t *p_demux )
573 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
574 input_thread_t *p_input;
575 input_item_t *p_parent_input;
577 playlist_t *p_playlist = pl_Yield( p_demux );
578 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
583 msg_Err( p_demux, "parent input could not be found" );
587 p_parent_input = input_GetItem(p_input);
589 vlc_mutex_lock( &p_parent_input->lock );
590 FREENULL( p_parent_input->psz_uri );
591 p_parent_input->psz_uri = strdup( p_sdp->psz_uri );
592 FREENULL( p_parent_input->psz_name );
593 p_parent_input->psz_name = strdup( p_sdp->psz_sessionname );
594 p_parent_input->i_type = ITEM_TYPE_NET;
596 if( p_playlist->status.p_item &&
597 p_playlist->status.p_item->p_input == p_parent_input )
599 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
600 p_playlist->status.p_node, p_playlist->status.p_item );
603 vlc_mutex_unlock( &p_parent_input->lock );
604 vlc_object_release( p_input );
605 vlc_object_release( p_playlist );
610 static int Control( demux_t *p_demux, int i_query, va_list args )
615 /**************************************************************
617 **************************************************************/
619 /* i_read is at least > 6 */
620 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
625 const uint8_t *end = buf + len;
628 assert (buf[len] == '\0');
633 uint8_t flags = buf[0];
635 /* First, check the sap announce is correct */
636 if ((flags >> 5) != 1)
639 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
640 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
644 msg_Dbg( p_sd, "encrypted packet, unsupported" );
648 vlc_bool_t b_compressed = (flags & 0x01) != 0;
650 uint16_t i_hash = U16_AT (buf + 2);
652 if( p_sd->p_sys->b_strict && i_hash == 0 )
654 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
658 // Skips source address and auth data
659 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
663 uint8_t *decomp = NULL;
666 int newsize = Decompress (buf, &decomp, end - buf);
669 msg_Dbg( p_sd, "decompression of SAP packet failed" );
673 decomp = realloc (decomp, newsize + 1);
674 decomp[newsize] = '\0';
675 psz_sdp = (const char *)decomp;
680 psz_sdp = (const char *)buf;
684 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
685 assert( psz_sdp[len] == '\0');
687 /* Skip payload type */
688 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
689 if (strncmp (psz_sdp, "v=0", 3))
691 size_t clen = strlen (psz_sdp) + 1;
693 if (strcmp (psz_sdp, "application/sdp"))
695 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
699 // skips content type
708 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
713 p_sdp->psz_sdp = psz_sdp;
715 /* Decide whether we should add a playlist item for this SDP */
716 /* Parse connection information (c= & m= ) */
717 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
718 p_sdp->psz_uri = NULL;
720 /* Multi-media or no-parse -> pass to LIVE.COM */
721 if( ( p_sdp->i_media_type != 14
722 && p_sdp->i_media_type != 32
723 && p_sdp->i_media_type != 33)
724 || p_sd->p_sys->b_parse == VLC_FALSE )
726 free( p_sdp->psz_uri );
727 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
728 p_sdp->psz_uri = NULL;
731 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
733 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
736 /* FIXME: we create a new announce each time the sdp changes */
737 if( IsSameSession( p_sd->p_sys->pp_announces[i]->p_sdp, p_sdp ) )
741 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
745 p_sd->p_sys->pp_announces[i]->i_last = mdate();
747 FreeSDP( p_sdp ); p_sdp = NULL;
752 CreateAnnounce( p_sd, i_hash, p_sdp );
758 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
761 input_item_t *p_input;
762 playlist_item_t *p_item, *p_child;
763 const char *psz_value;
764 sap_announce_t *p_sap = (sap_announce_t *)malloc(
765 sizeof(sap_announce_t ) );
766 services_discovery_sys_t *p_sys;
772 p_sap->i_last = mdate();
773 p_sap->i_hash = i_hash;
774 p_sap->p_sdp = p_sdp;
776 /* Create the actual playlist item here */
777 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
778 p_sap->p_sdp->psz_uri,
779 p_sdp->psz_sessionname,
780 0, NULL, -1, ITEM_TYPE_NET );
781 p_sap->i_input_id = p_input->i_id;
788 if( p_sys->b_timeshift )
789 input_ItemAddOption( p_input, ":access-filter=timeshift" );
791 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
792 if( psz_value != NULL )
794 input_ItemAddInfo( p_input, _("Session"),_("Tool"), psz_value );
796 if( strcmp( p_sdp->username, "-" ) )
798 input_ItemAddInfo( p_input, _("Session"),
799 _("User"), p_sdp->username );
803 if (p_sap->p_sdp->mediac >= 1)
804 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
806 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
808 if( psz_value != NULL )
810 p_child = playlist_ChildSearchName( p_sys->p_node_cat, psz_value );
812 if( p_child == NULL )
814 p_child = playlist_NodeCreate( pl_Get( p_sd ), psz_value,
815 p_sys->p_node_cat, 0 );
816 p_child->i_flags &= ~PLAYLIST_SKIP_FLAG;
821 p_child = p_sys->p_node_cat;
824 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input, p_child,
825 PLAYLIST_APPEND, PLAYLIST_END, VLC_FALSE );
826 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
827 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
828 p_sap->i_item_id_cat = p_item->i_id;
830 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input,
831 p_sys->p_node_one, PLAYLIST_APPEND, PLAYLIST_END,
833 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
834 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
835 p_sap->i_item_id_one = p_item->i_id;
837 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
843 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
846 /* Look for media attribute, and fallback to session */
847 return GetAttribute (sdp->mediav[media].pp_attributes,
848 sdp->mediav[media].i_attributes, name)
849 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
853 /* Fill p_sdp->psz_uri */
854 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
856 if (p_sdp->mediac == 0)
858 msg_Dbg (p_obj, "Ignoring SDP with no media");
862 for (unsigned i = 1; i < p_sdp->mediac; i++)
864 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
865 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
866 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
867 p_sdp->mediav->addrlen))
869 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
874 if (p_sdp->mediav->n_addr != 1)
876 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
885 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
886 p_sdp->mediav->addrlen, psz_uri + 1,
887 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
890 if (strchr (psz_uri + 1, ':'))
893 psz_uri[strlen (psz_uri)] = ']';
899 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
900 if (sdp_proto == NULL)
903 char *subtype = strchr (sdp_proto, ' ');
906 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
907 p_sdp->i_media_type = 0;
912 p_sdp->i_media_type = atoi (subtype);
914 if (p_sdp->i_media_type == 0)
915 p_sdp->i_media_type = 33;
917 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
918 * 0x1: Connection-Oriented media. */
919 static const char proto_match[] =
921 "RTP/AVP\0" "rtp\0\0"
922 "UDPLite/RTP/AVP\0" "udplite\0\0"
923 "DCCP/RTP/AVP\0" "dccp\0\1"
924 "TCP/RTP/AVP\0" "rtptcp\0\1"
927 const char *vlc_proto = NULL;
929 for (const char *proto = proto_match; *proto;)
931 if (strcasecmp (proto, sdp_proto) == 0)
933 vlc_proto = proto + strlen (proto) + 1;
934 flags = vlc_proto[strlen (vlc_proto) + 1];
937 proto += strlen (proto) + 1;
938 proto += strlen (proto) + 2;
942 if (vlc_proto == NULL)
944 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
945 p_sdp->mediav[0].fmt);
951 /* Connection-oriented media */
952 const char *setup = FindAttribute (p_sdp, 0, "setup");
954 setup = "active"; /* default value */
956 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
958 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
962 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
968 /* Non-connected (normally multicast) media */
970 char psz_source[258] = "";
971 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
974 char psz_source_ip[256];
977 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
980 /* According to RFC4570, FQDNs can be used for source-filters,
981 * but -seriously- this is impractical */
987 struct in6_addr addr;
988 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
989 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
990 sizeof (psz_source) - 2) != NULL))
993 psz_source[strlen (psz_source)] = ']';
1000 struct in_addr addr;
1001 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1002 && (inet_ntop (AF_INET, &addr, psz_source,
1003 sizeof (psz_source)) == NULL))
1011 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1020 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1021 socklen_t *addrlen, unsigned *number)
1024 unsigned fam, n1, n2;
1026 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1034 addr->ss_family = AF_INET6;
1038 *addrlen = sizeof (struct sockaddr_in6);
1040 if (inet_pton (AF_INET6, host,
1041 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1044 *number = (res >= 3) ? n1 : 1;
1049 addr->ss_family = AF_INET;
1053 *addrlen = sizeof (struct sockaddr_in);
1055 if (inet_pton (AF_INET, host,
1056 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1059 *number = (res >= 4) ? n2 : 1;
1069 /***********************************************************************
1070 * ParseSDP : SDP parsing
1071 * *********************************************************************
1072 * Validate SDP and parse all fields
1073 ***********************************************************************/
1074 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1076 if( psz_sdp == NULL )
1079 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1084 struct sockaddr_storage glob_addr;
1085 memset (&glob_addr, 0, sizeof (glob_addr));
1086 socklen_t glob_len = 0;
1087 unsigned glob_count = 1;
1090 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1093 /* Extract one line */
1094 char *eol = strchr (psz_sdp, '\n');
1095 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1096 char line[linelen + 1];
1097 memcpy (line, psz_sdp, linelen);
1098 line[linelen] = '\0';
1100 psz_sdp += linelen + 1;
1102 /* Remove carriage return if present */
1103 eol = strchr (line, '\r');
1106 linelen = eol - line;
1107 line[linelen] = '\0';
1111 char cat = line[0], *data = line + 2;
1112 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1114 /* MUST ignore SDP with unknown line type */
1115 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1120 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1124 assert (linelen >= 2);
1126 /* SDP parsing state machine
1127 * We INTERNALLY use uppercase for session, lowercase for media
1131 /* Session description */
1136 msg_Dbg (p_obj, "missing SDP version");
1139 if (strcmp (data, "0"))
1141 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1151 msg_Dbg (p_obj, "missing SDP originator");
1155 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1156 p_sdp->username, &p_sdp->session_id,
1157 &p_sdp->session_version, &p_sdp->orig_ip_version,
1158 p_sdp->orig_host) != 5)
1159 || ((p_sdp->orig_ip_version != 4)
1160 && (p_sdp->orig_ip_version != 6)))
1162 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1163 /* Or maybe out-of-range, but this looks suspicious */
1166 EnsureUTF8 (p_sdp->orig_host);
1173 if ((cat != 's') || !*data)
1175 /* MUST be present AND non-empty */
1176 msg_Dbg (p_obj, "missing SDP session name");
1179 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1180 p_sdp->psz_sessionname = strdup (data);
1181 EnsureUTF8 (p_sdp->psz_sessionname);
1182 if (p_sdp->psz_sessionname == NULL)
1207 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1210 msg_Dbg (p_obj, "SDP connection infos not supported: "
1217 assert (expect == 'B');
1224 msg_Dbg (p_obj, "missing SDP time description");
1230 if ((cat == 't') || (cat == 'r'))
1245 attribute_t *p_attr = MakeAttribute (data);
1246 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1250 /* Media description */
1257 msg_Dbg (p_obj, "missing SDP media description");
1260 struct sdp_media_t *m;
1261 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1269 memset (m, 0, sizeof (*m));
1270 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1271 m->n_addr = glob_count;
1273 /* TODO: remember media type (if we need multiple medias) */
1274 data = strchr (data, ' ');
1277 msg_Dbg (p_obj, "missing SDP media port");
1280 port = atoi (++data);
1281 if (port <= 0 || port >= 65536)
1283 msg_Dbg (p_obj, "invalid transport port %d", port);
1286 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1288 data = strchr (data, ' ');
1291 msg_Dbg (p_obj, "missing SDP media format");
1294 m->fmt = strdup (++data);
1308 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1309 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1312 msg_Dbg (p_obj, "SDP connection infos not supported: "
1316 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1328 assert (expect == 'a');
1331 attribute_t *p_attr = MakeAttribute (data);
1335 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1336 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1345 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1351 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1363 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1366 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1368 return VLC_EGENERIC;
1370 shutdown( i_fd, SHUT_WR );
1371 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1372 p_sd->p_sys->i_fd, i_fd);
1376 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1379 int i_result, i_dstsize, n = 0;
1380 unsigned char *psz_dst = NULL;
1383 memset (&d_stream, 0, sizeof (d_stream));
1385 i_result = inflateInit(&d_stream);
1386 if( i_result != Z_OK )
1389 d_stream.next_in = (Bytef *)psz_src;
1390 d_stream.avail_in = i_len;
1395 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1396 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1397 d_stream.avail_out = 1000;
1399 i_result = inflate(&d_stream, Z_NO_FLUSH);
1400 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1402 inflateEnd( &d_stream );
1406 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1407 ( i_result != Z_STREAM_END ) );
1409 i_dstsize = d_stream.total_out;
1410 inflateEnd( &d_stream );
1412 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1424 static void FreeSDP( sdp_t *p_sdp )
1426 free( p_sdp->psz_sessionname );
1427 free( p_sdp->psz_uri );
1429 for (unsigned j = 0; j < p_sdp->mediac; j++)
1431 free (p_sdp->mediav[j].fmt);
1432 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1433 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1434 free (p_sdp->mediav[j].pp_attributes);
1436 free (p_sdp->mediav);
1438 for (int i = 0; i < p_sdp->i_attributes; i++)
1439 FreeAttribute (p_sdp->pp_attributes[i]);
1441 free (p_sdp->pp_attributes);
1445 static int RemoveAnnounce( services_discovery_t *p_sd,
1446 sap_announce_t *p_announce )
1450 if( p_announce->p_sdp )
1452 FreeSDP( p_announce->p_sdp );
1453 p_announce->p_sdp = NULL;
1456 if( p_announce->i_input_id > -1 )
1457 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1459 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1461 if( p_sd->p_sys->pp_announces[i] == p_announce )
1463 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1474 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1476 /* A session is identified by
1479 * - network type (which is always IN),
1480 * - address type (currently, this means IP version),
1483 if (strcmp (p_sdp1->username, p_sdp2->username)
1484 || (p_sdp1->session_id != p_sdp2->session_id)
1485 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1486 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1493 static inline attribute_t *MakeAttribute (const char *str)
1495 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1499 strcpy (a->name, str);
1500 EnsureUTF8 (a->name);
1501 char *value = strchr (a->name, ':');
1513 static const char *GetAttribute (attribute_t **tab, unsigned n,
1516 for (unsigned i = 0; i < n; i++)
1517 if (strcasecmp (tab[i]->name, name) == 0)
1518 return tab[i]->value;
1523 static inline void FreeAttribute (attribute_t *a)