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>
53 /************************************************************************
54 * Macros and definitions
55 ************************************************************************/
57 #define MAX_LINE_LENGTH 256
59 /* SAP is always on that port */
61 /* Global-scope SAP address */
62 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
63 /* Organization-local SAP address */
64 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
65 /* Local (smallest non-link-local scope) SAP address */
66 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
67 /* Link-local SAP address */
68 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
71 #define SAP_V6_1 "FF0"
72 /* Scope is inserted between them */
73 #define SAP_V6_2 "::2:7FFE"
74 /* See RFC3513 for list of valid scopes */
75 /* FIXME: find a way to listen to link-local scope */
76 static const char ipv6_scopes[] = "1456789ABCDE";
79 /*****************************************************************************
81 *****************************************************************************/
82 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
83 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
84 "right addresses to listen to. However, you " \
85 "can specify a specific address." )
86 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
87 #define SAP_IPV4_LONGTEXT N_( \
88 "Listen to IPv4 announcements " \
89 "on the standard address." )
90 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
91 #define SAP_IPV6_LONGTEXT N_( \
92 "Listen to IPv6 announcements " \
93 "on the standard addresses." )
94 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
95 #define SAP_SCOPE_LONGTEXT N_( \
96 "Scope for IPv6 announcements (default is 8)." )
97 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
98 #define SAP_TIMEOUT_LONGTEXT N_( \
99 "Delay after which SAP items get deleted if no new announcement " \
101 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
102 #define SAP_PARSE_LONGTEXT N_( \
103 "This enables actual parsing of the announces by the SAP module. " \
104 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
105 "(RTP/RTSP) module." )
106 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
107 #define SAP_STRICT_LONGTEXT N_( \
108 "When this is set, the SAP parser will discard some non-compliant " \
110 #define SAP_CACHE_TEXT N_("Use SAP cache")
111 #define SAP_CACHE_LONGTEXT N_( \
112 "This enables a SAP caching mechanism. " \
113 "This will result in lower SAP startup time, but you could end up " \
114 "with items corresponding to legacy streams." )
115 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
116 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
117 "for streams discovered through SAP announcements." )
120 static int Open ( vlc_object_t * );
121 static void Close( vlc_object_t * );
122 static int OpenDemux ( vlc_object_t * );
123 static void CloseDemux ( vlc_object_t * );
126 set_shortname( _("SAP"));
127 set_description( _("SAP Announcements") );
128 set_category( CAT_PLAYLIST );
129 set_subcategory( SUBCAT_PLAYLIST_SD );
131 add_string( "sap-addr", NULL, NULL,
132 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
133 add_bool( "sap-ipv4", 1 , NULL,
134 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
135 add_bool( "sap-ipv6", 1 , NULL,
136 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
137 add_integer( "sap-timeout", 1800, NULL,
138 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
139 add_bool( "sap-parse", 1 , NULL,
140 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
141 add_bool( "sap-strict", 0 , NULL,
142 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
144 add_bool( "sap-cache", 0 , NULL,
145 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
147 add_bool( "sap-timeshift", 0 , NULL,
148 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
150 set_capability( "services_discovery", 0 );
151 set_callbacks( Open, Close );
154 set_description( _("SDP file parser for UDP") );
155 add_shortcut( "sdp" );
156 set_capability( "demux2", 51 );
157 set_callbacks( OpenDemux, CloseDemux );
161 /*****************************************************************************
163 *****************************************************************************/
165 typedef struct sdp_t sdp_t;
166 typedef struct attribute_t attribute_t;
167 typedef struct sap_announce_t sap_announce_t;
172 struct sdp_t *parent;
174 struct sockaddr_storage addr;
178 attribute_t **pp_attributes;
182 /* The structure that contains sdp information */
190 uint64_t session_version;
191 unsigned orig_ip_version;
192 char orig_host[1024];
195 char *psz_sessionname;
202 /* a= global attributes */
204 attribute_t **pp_attributes;
206 /* medias (well, we only support one atm) */
208 struct sdp_media_t mediav[1];
217 struct sap_announce_t
222 uint32_t i_source[4];
224 /* SAP annnounces must only contain one SDP */
232 struct services_discovery_sys_t
234 /* Socket descriptors */
239 playlist_item_t *p_node_cat;
240 playlist_item_t *p_node_one;
242 /* Table of announces */
244 struct sap_announce_t **pp_announces;
249 vlc_bool_t b_timeshift;
259 /*****************************************************************************
261 *****************************************************************************/
265 static int Demux( demux_t *p_demux );
266 static int Control( demux_t *, int, va_list );
267 static void Run ( services_discovery_t *p_sd );
269 /* Main parsing functions */
270 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
271 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
272 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
273 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
274 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
276 /* Helper functions */
277 static inline attribute_t *MakeAttribute (const char *str);
278 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
279 static inline void FreeAttribute (attribute_t *a);
281 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
282 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
283 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
284 static void FreeSDP( sdp_t *p_sdp );
286 /*****************************************************************************
287 * Open: initialize and create stuff
288 *****************************************************************************/
289 static int Open( vlc_object_t *p_this )
291 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
292 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
293 malloc( sizeof( services_discovery_sys_t ) );
295 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
303 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
304 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
307 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
313 /* Cache sap_timeshift value */
314 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" )
315 ? VLC_TRUE : VLC_FALSE;
317 /* Create our playlist node */
320 playlist_NodesPairCreate( pl_Get( p_sd ), _("SAP sessions"),
321 &p_sys->p_node_cat, &p_sys->p_node_one,
323 p_sys->p_node_cat->p_input->b_prefers_tree = VLC_TRUE;
324 p_sys->i_announces = 0;
325 p_sys->pp_announces = NULL;
330 /*****************************************************************************
331 * OpenDemux: initialize and create stuff
332 *****************************************************************************/
333 static int OpenDemux( vlc_object_t *p_this )
335 demux_t *p_demux = (demux_t *)p_this;
337 int i_max_sdp = 1024;
339 char *psz_sdp = NULL;
342 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
344 /* We want livedotcom module to parse this SDP file */
351 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 ) return VLC_EGENERIC;
353 if( strncmp( (char*)p_peek, "v=0\r\n", 5 ) &&
354 strncmp( (char*)p_peek, "v=0\n", 4 ) &&
355 ( p_peek[0] < 'a' || p_peek[0] > 'z' || p_peek[1] != '=' ) )
361 psz_sdp = (char *)malloc( i_max_sdp );
362 if( !psz_sdp ) return VLC_EGENERIC;
364 /* Gather the complete sdp file */
367 int i_read = stream_Read( p_demux->s,
368 &psz_sdp[i_sdp], i_max_sdp - i_sdp - 1 );
372 msg_Err( p_demux, "failed to read SDP" );
378 if( i_read < i_max_sdp - i_sdp - 1 )
380 psz_sdp[i_sdp] = '\0';
385 psz_sdp = (char *)realloc( psz_sdp, i_max_sdp );
388 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
392 msg_Warn( p_demux, "invalid SDP");
396 if( p_sdp->mediac > 1 )
401 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
403 p_sdp->psz_uri = NULL;
405 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
406 p_sdp->i_media_type != 14 )
409 if( p_sdp->psz_uri == NULL ) goto error;
411 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
412 p_demux->p_sys->p_sdp = p_sdp;
413 p_demux->pf_control = Control;
414 p_demux->pf_demux = Demux;
421 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
422 stream_Seek( p_demux->s, 0 );
426 /*****************************************************************************
428 *****************************************************************************/
429 static void Close( vlc_object_t *p_this )
431 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
432 services_discovery_sys_t *p_sys = p_sd->p_sys;
436 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
438 net_Close( p_sys->pi_fd[i] );
440 FREENULL( p_sys->pi_fd );
443 if( config_GetInt( p_sd, "sap-cache" ) )
449 for( i = p_sys->i_announces - 1; i>= 0; i-- )
451 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
453 FREENULL( p_sys->pp_announces );
455 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_cat, VLC_TRUE,
457 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_one, VLC_TRUE,
463 /*****************************************************************************
464 * CloseDemux: Close the demuxer
465 *****************************************************************************/
466 static void CloseDemux( vlc_object_t *p_this )
468 demux_t *p_demux = (demux_t *)p_this;
471 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
472 free( p_demux->p_sys );
476 /*****************************************************************************
477 * Run: main SAP thread
478 *****************************************************************************
479 * Listens to SAP packets, and sends them to packet_handle
480 *****************************************************************************/
481 #define MAX_SAP_BUFFER 5000
483 static void Run( services_discovery_t *p_sd )
488 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
489 * DNS queries, even if the DNS server returns an error with milliseconds.
490 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
491 * Winsock 1.1 from Windows 95, if not Windows 3.1.
492 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
493 * we have to open sockets in Run() rather than Open(). */
494 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
496 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
497 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
498 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
499 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
501 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
503 char psz_address[] = SAP_V6_1"0"SAP_V6_2;
506 for( c_scope = ipv6_scopes; *c_scope; c_scope++ )
508 psz_address[sizeof(SAP_V6_1) - 1] = *c_scope;
509 InitSocket( p_sd, psz_address, SAP_PORT );
513 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
514 if( psz_addr && *psz_addr )
516 InitSocket( p_sd, psz_addr, SAP_PORT );
520 if( p_sd->p_sys->i_fd == 0 )
522 msg_Err( p_sd, "unable to listen on any address" );
526 /* read SAP packets */
527 while( !p_sd->b_die )
530 uint8_t p_buffer[MAX_SAP_BUFFER+1];
532 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd, NULL,
533 p_sd->p_sys->i_fd, p_buffer,
534 MAX_SAP_BUFFER, 500000 );
536 /* Check for items that need deletion */
537 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
539 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
541 if( mdate() - p_sd->p_sys->pp_announces[i]->i_last > i_timeout )
543 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i] );
547 /* Minimum length is > 6 */
552 msg_Warn( p_sd, "socket read error" );
557 p_buffer[i_read] = '\0';
559 /* Parse the packet */
560 ParseSAP( p_sd, p_buffer, i_read );
564 /**********************************************************************
565 * Demux: reads and demuxes data packets
566 * Return -1 if error, 0 if EOF, 1 else
567 **********************************************************************/
568 static int Demux( demux_t *p_demux )
570 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
571 input_thread_t *p_input;
572 input_item_t *p_parent_input;
574 playlist_t *p_playlist = pl_Yield( p_demux );
575 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
580 msg_Err( p_demux, "parent input could not be found" );
584 p_parent_input = input_GetItem(p_input);
586 vlc_mutex_lock( &p_parent_input->lock );
587 FREENULL( p_parent_input->psz_uri );
588 p_parent_input->psz_uri = strdup( p_sdp->psz_uri );
589 FREENULL( p_parent_input->psz_name );
590 p_parent_input->psz_name = strdup( p_sdp->psz_sessionname );
591 p_parent_input->i_type = ITEM_TYPE_NET;
593 if( p_playlist->status.p_item &&
594 p_playlist->status.p_item->p_input == p_parent_input )
596 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
597 p_playlist->status.p_node, p_playlist->status.p_item );
600 vlc_mutex_unlock( &p_parent_input->lock );
601 vlc_object_release( p_input );
602 vlc_object_release( p_playlist );
607 static int Control( demux_t *p_demux, int i_query, va_list args )
612 /**************************************************************
614 **************************************************************/
616 /* i_read is at least > 6 */
617 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
622 const uint8_t *end = buf + len;
625 assert (buf[len] == '\0');
630 uint8_t flags = buf[0];
632 /* First, check the sap announce is correct */
633 if ((flags >> 5) != 1)
636 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
637 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
641 msg_Dbg( p_sd, "encrypted packet, unsupported" );
645 vlc_bool_t b_compressed = (flags & 0x01) != 0;
647 uint16_t i_hash = U16_AT (buf + 2);
649 if( p_sd->p_sys->b_strict && i_hash == 0 )
651 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
655 // Skips source address and auth data
656 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
660 uint8_t *decomp = NULL;
663 int newsize = Decompress (buf, &decomp, end - buf);
666 msg_Warn( p_sd, "decompression of sap packet failed" );
670 decomp = realloc (decomp, newsize + 1);
671 decomp[newsize] = '\0';
673 psz_sdp = (const char *)decomp;
678 psz_sdp = (const char *)buf;
682 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
683 assert( psz_sdp[len] == '\0');
685 /* Skip payload type */
686 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
687 if (strncmp (psz_sdp, "v=0", 3))
689 size_t clen = strlen (psz_sdp) + 1;
691 if (strcmp (psz_sdp, "application/sdp"))
693 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
697 // skips content type
706 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
713 /* Decide whether we should add a playlist item for this SDP */
714 /* Parse connection information (c= & m= ) */
715 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
717 p_sdp->psz_uri = NULL;
720 /* Multi-media or no-parse -> pass to LIVE.COM */
721 if( p_sdp->mediac > 1 || ( 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 if( p_sdp->psz_uri ) free( p_sdp->psz_uri );
727 asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp );
730 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
732 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
735 /* FIXME: we create a new announce each time the sdp changes */
736 if( IsSameSession( p_sd->p_sys->pp_announces[i]->p_sdp, p_sdp ) )
740 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
744 p_sd->p_sys->pp_announces[i]->i_last = mdate();
746 FreeSDP( p_sdp ); p_sdp = NULL;
751 CreateAnnounce( p_sd, i_hash, p_sdp );
757 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
760 input_item_t *p_input;
761 playlist_item_t *p_item, *p_child;
762 const char *psz_value;
763 sap_announce_t *p_sap = (sap_announce_t *)malloc(
764 sizeof(sap_announce_t ) );
765 services_discovery_sys_t *p_sys;
771 p_sap->i_last = mdate();
772 p_sap->i_hash = i_hash;
773 p_sap->p_sdp = p_sdp;
775 /* Create the actual playlist item here */
776 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
777 p_sap->p_sdp->psz_uri,
778 p_sdp->psz_sessionname,
779 0, NULL, -1, ITEM_TYPE_NET );
780 p_sap->i_input_id = p_input->i_id;
787 if( p_sys->b_timeshift )
788 input_ItemAddOption( p_input, ":access-filter=timeshift" );
790 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
791 if( psz_value != NULL )
793 input_ItemAddInfo( p_input, _("Session"),_("Tool"), psz_value );
795 if( strcmp( p_sdp->username, "-" ) )
797 input_ItemAddInfo( p_input, _("Session"),
798 _("User"), p_sdp->username );
802 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
803 if( psz_value == NULL )
804 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "plgroup" );
806 if( psz_value != NULL )
808 p_child = playlist_ChildSearchName( p_sys->p_node_cat, psz_value );
810 if( p_child == NULL )
812 p_child = playlist_NodeCreate( pl_Get( p_sd ), psz_value,
813 p_sys->p_node_cat, 0 );
814 p_child->i_flags &= ~PLAYLIST_SKIP_FLAG;
819 p_child = p_sys->p_node_cat;
822 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input, p_child,
823 PLAYLIST_APPEND, PLAYLIST_END );
824 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
825 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
826 p_sap->i_item_id_cat = p_item->i_id;
828 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input,
829 p_sys->p_node_one, PLAYLIST_APPEND, PLAYLIST_END );
830 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
831 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
832 p_sap->i_item_id_one = p_item->i_id;
834 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
839 /* Fill p_sdp->psz_uri */
840 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
842 if (p_sdp->mediac != 1)
850 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav[0].addr),
851 p_sdp->mediav[0].addrlen, psz_uri + 1,
852 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
855 if (strchr (psz_uri + 1, ':'))
858 psz_uri[strlen (psz_uri)] = ']';
864 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
865 if (sdp_proto == NULL)
868 char *subtype = strchr (sdp_proto, ' ');
869 if (sdp_proto == NULL)
871 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
872 p_sdp->i_media_type = 0;
877 p_sdp->i_media_type = atoi (subtype);
879 if (p_sdp->i_media_type == 0)
880 p_sdp->i_media_type = 33;
882 static const char proto_match[] =
885 "UDPLite/RTP/AVP\0" "udplite\0"
886 "DCCP/RTP/AVP\0" "dccp\0"
887 "TCP/RTP/AVP\0" "tcp\0"
890 const char *vlc_proto = NULL;
891 for (const char *proto = proto_match; *proto;)
893 if (strcasecmp (proto, sdp_proto))
895 vlc_proto = proto + strlen (proto) + 1;
898 proto += strlen (proto) + 1;
899 proto += strlen (proto) + 1;
903 if (vlc_proto == NULL)
905 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
906 p_sdp->mediav[0].fmt);
910 /* handle SSM case */
911 const char *sfilter = GetAttribute( p_sdp->mediav[0].pp_attributes,
912 p_sdp->mediav[0].i_attributes,
915 sfilter = GetAttribute( p_sdp->pp_attributes, p_sdp->i_attributes,
918 char psz_source[258] = "";
921 char psz_source_ip[256];
923 if (sscanf (sfilter, " incl IN IP%*c %*s %255s ", psz_source_ip) == 1)
925 if (strchr (psz_source_ip, ':') != NULL)
926 sprintf (psz_source, "[%s]", psz_source_ip);
928 strcpy (psz_source, psz_source_ip);
932 asprintf( &p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
939 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
940 socklen_t *addrlen, unsigned *number)
943 unsigned fam, n1, n2;
945 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
953 addr->ss_family = AF_INET6;
957 *addrlen = sizeof (struct sockaddr_in6);
959 if (inet_pton (AF_INET6, host,
960 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
963 *number = (res >= 3) ? n1 : 1;
968 addr->ss_family = AF_INET;
972 *addrlen = sizeof (struct sockaddr_in);
974 if (inet_pton (AF_INET, host,
975 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
978 *number = (res >= 4) ? n2 : 1;
988 /***********************************************************************
989 * ParseSDP : SDP parsing
990 * *********************************************************************
991 * Validate SDP and parse all fields
992 ***********************************************************************/
993 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
995 if( psz_sdp == NULL )
998 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1003 struct sockaddr_storage glob_addr;
1004 memset (&glob_addr, 0, sizeof (glob_addr));
1005 socklen_t glob_len = 0;
1006 unsigned glob_count = 1;
1008 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1011 /* Extract one line */
1012 char *eol = strchr (psz_sdp, '\n');
1013 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1014 char line[linelen + 1];
1015 memcpy (line, psz_sdp, linelen);
1016 line[linelen] = '\0';
1018 psz_sdp += linelen + 1;
1020 /* Remove carriage return if present */
1021 eol = strchr (line, '\r');
1024 linelen = eol - line;
1025 line[linelen] = '\0';
1029 char cat = line[0], *data = line + 2;
1030 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1032 /* MUST ignore SDP with unknown line type */
1033 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1038 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1042 assert (linelen >= 2);
1044 /* SDP parsing state machine
1045 * We INTERNALLY use uppercase for session, lowercase for media
1049 /* Session description */
1054 msg_Dbg (p_obj, "missing SDP version");
1057 if (strcmp (data, "0"))
1059 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1069 msg_Dbg (p_obj, "missing SDP originator");
1073 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1074 p_sdp->username, &p_sdp->session_id,
1075 &p_sdp->session_version, &p_sdp->orig_ip_version,
1076 p_sdp->orig_host) != 5)
1077 || ((p_sdp->orig_ip_version != 4)
1078 && (p_sdp->orig_ip_version != 6)))
1080 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1081 /* Or maybe out-of-range, but this looks suspicious */
1084 EnsureUTF8 (p_sdp->orig_host);
1091 if ((cat != 's') || !*data)
1093 /* MUST be present AND non-empty */
1094 msg_Dbg (p_obj, "missing SDP session name");
1097 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1098 p_sdp->psz_sessionname = strdup (data);
1099 EnsureUTF8 (p_sdp->psz_sessionname);
1100 if (p_sdp->psz_sessionname == NULL)
1125 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1128 msg_Dbg (p_obj, "SDP connection infos not supported: "
1135 assert (expect == 'B');
1142 msg_Dbg (p_obj, "missing SDP time description");
1148 if ((cat == 't') || (cat == 'r'))
1163 attribute_t *p_attr = MakeAttribute (data);
1164 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1168 /* Media description */
1174 msg_Dbg (p_obj, "missing SDP media description");
1177 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac;
1179 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1180 m->n_addr = glob_count;
1182 /* TODO: remember media type (if we need multiple medias) */
1183 data = strchr (data, ' ');
1186 msg_Dbg (p_obj, "missing SDP media port");
1189 int port = atoi (data);
1190 if (port <= 0 || port >= 65536)
1192 msg_Dbg (p_obj, "invalid transport port %d", port);
1195 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1197 data = strchr (data, ' ');
1200 msg_Dbg (p_obj, "missing SDP media format");
1203 m->fmt = strdup (data);
1218 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac;
1219 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1222 msg_Dbg (p_obj, "SDP connection infos not supported: "
1237 assert (expect == 'a');
1240 attribute_t *p_attr = MakeAttribute (data);
1244 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1245 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1252 msg_Dbg (p_obj, "multi-media SDP not implemented -> live555");
1258 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1264 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1276 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1279 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1281 return VLC_EGENERIC;
1283 net_StopSend( i_fd );
1284 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1285 p_sd->p_sys->i_fd, i_fd);
1289 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1292 int i_result, i_dstsize, n = 0;
1293 unsigned char *psz_dst = NULL;
1296 memset (&d_stream, 0, sizeof (d_stream));
1298 i_result = inflateInit(&d_stream);
1299 if( i_result != Z_OK )
1302 d_stream.next_in = (Bytef *)psz_src;
1303 d_stream.avail_in = i_len;
1308 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1309 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1310 d_stream.avail_out = 1000;
1312 i_result = inflate(&d_stream, Z_NO_FLUSH);
1313 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1315 inflateEnd( &d_stream );
1319 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1320 ( i_result != Z_STREAM_END ) );
1322 i_dstsize = d_stream.total_out;
1323 inflateEnd( &d_stream );
1325 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1337 static void FreeSDP( sdp_t *p_sdp )
1339 FREENULL( p_sdp->psz_sdp );
1340 FREENULL( p_sdp->psz_sessionname );
1341 FREENULL( p_sdp->psz_uri );
1343 for (unsigned j = 0; j < p_sdp->mediac; j++)
1345 free (p_sdp->mediav[j].fmt);
1346 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1347 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1350 for (int i = 0; i < p_sdp->i_attributes; i++)
1351 FreeAttribute (p_sdp->pp_attributes[i]);
1353 free (p_sdp->pp_attributes);
1357 static int RemoveAnnounce( services_discovery_t *p_sd,
1358 sap_announce_t *p_announce )
1362 if( p_announce->p_sdp )
1364 FreeSDP( p_announce->p_sdp );
1365 p_announce->p_sdp = NULL;
1368 if( p_announce->i_input_id > -1 )
1369 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1371 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1373 if( p_sd->p_sys->pp_announces[i] == p_announce )
1375 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1386 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1388 /* A session is identified by
1391 * - network type (which is always IN),
1392 * - address type (currently, this means IP version),
1395 if (strcmp (p_sdp1->username, p_sdp2->username)
1396 || (p_sdp1->session_id != p_sdp2->session_id)
1397 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1398 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1405 static inline attribute_t *MakeAttribute (const char *str)
1407 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1411 strcpy (a->name, str);
1412 EnsureUTF8 (a->name);
1413 char *value = strchr (a->name, ':');
1425 static const char *GetAttribute (attribute_t **tab, unsigned n,
1428 for (unsigned i = 0; i < n; i++)
1429 if (strcasecmp (tab[i]->name, name) == 0)
1430 return tab[i]->value;
1435 static inline void FreeAttribute (attribute_t *a)