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>
57 /************************************************************************
58 * Macros and definitions
59 ************************************************************************/
61 #define MAX_LINE_LENGTH 256
63 /* SAP is always on that port */
65 /* Global-scope SAP address */
66 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
67 /* Organization-local SAP address */
68 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
69 /* Local (smallest non-link-local scope) SAP address */
70 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
71 /* Link-local SAP address */
72 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
75 /*****************************************************************************
77 *****************************************************************************/
78 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
79 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
80 "right addresses to listen to. However, you " \
81 "can specify a specific address." )
82 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
83 #define SAP_IPV4_LONGTEXT N_( \
84 "Listen to IPv4 announcements on the standard addresses." )
85 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
86 #define SAP_IPV6_LONGTEXT N_( \
87 "Listen to IPv6 announcements on the standard addresses." )
88 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
89 #define SAP_SCOPE_LONGTEXT N_( \
90 "Scope for IPv6 announcements (default is 8)." )
91 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
92 #define SAP_TIMEOUT_LONGTEXT N_( \
93 "Delay after which SAP items get deleted if no new announcement " \
95 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
96 #define SAP_PARSE_LONGTEXT N_( \
97 "This enables actual parsing of the announces by the SAP module. " \
98 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
99 "(RTP/RTSP) module." )
100 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
101 #define SAP_STRICT_LONGTEXT N_( \
102 "When this is set, the SAP parser will discard some non-compliant " \
104 #define SAP_CACHE_TEXT N_("Use SAP cache")
105 #define SAP_CACHE_LONGTEXT N_( \
106 "This enables a SAP caching mechanism. " \
107 "This will result in lower SAP startup time, but you could end up " \
108 "with items corresponding to legacy streams." )
109 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
110 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
111 "for streams discovered through SAP announcements." )
114 static int Open ( vlc_object_t * );
115 static void Close( vlc_object_t * );
116 static int OpenDemux ( vlc_object_t * );
117 static void CloseDemux ( vlc_object_t * );
120 set_shortname( _("SAP"));
121 set_description( _("SAP Announcements") );
122 set_category( CAT_PLAYLIST );
123 set_subcategory( SUBCAT_PLAYLIST_SD );
125 add_string( "sap-addr", NULL, NULL,
126 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
127 add_bool( "sap-ipv4", 1 , NULL,
128 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
129 add_bool( "sap-ipv6", 1 , NULL,
130 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
131 add_integer( "sap-timeout", 1800, NULL,
132 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
133 add_bool( "sap-parse", 1 , NULL,
134 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
135 add_bool( "sap-strict", 0 , NULL,
136 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
138 add_bool( "sap-cache", 0 , NULL,
139 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
141 add_bool( "sap-timeshift", 0 , NULL,
142 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
144 set_capability( "services_discovery", 0 );
145 set_callbacks( Open, Close );
148 set_description( _("SDP Descriptions parser") );
149 add_shortcut( "sdp" );
150 set_capability( "demux2", 51 );
151 set_callbacks( OpenDemux, CloseDemux );
155 /*****************************************************************************
157 *****************************************************************************/
159 typedef struct sdp_t sdp_t;
160 typedef struct attribute_t attribute_t;
161 typedef struct sap_announce_t sap_announce_t;
166 struct sdp_t *parent;
168 struct sockaddr_storage addr;
172 attribute_t **pp_attributes;
176 /* The structure that contains sdp information */
184 uint64_t session_version;
185 unsigned orig_ip_version;
186 char orig_host[1024];
189 char *psz_sessionname;
196 /* a= global attributes */
198 attribute_t **pp_attributes;
200 /* medias (well, we only support one atm) */
202 struct sdp_media_t *mediav;
211 struct sap_announce_t
216 uint32_t i_source[4];
218 /* SAP annnounces must only contain one SDP */
226 struct services_discovery_sys_t
228 /* Socket descriptors */
233 playlist_item_t *p_node_cat;
234 playlist_item_t *p_node_one;
236 /* Table of announces */
238 struct sap_announce_t **pp_announces;
243 vlc_bool_t b_timeshift;
253 /*****************************************************************************
255 *****************************************************************************/
259 static int Demux( demux_t *p_demux );
260 static int Control( demux_t *, int, va_list );
261 static void Run ( services_discovery_t *p_sd );
263 /* Main parsing functions */
264 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
265 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
266 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
267 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
268 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
270 /* Helper functions */
271 static inline attribute_t *MakeAttribute (const char *str);
272 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
273 static inline void FreeAttribute (attribute_t *a);
274 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
277 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
278 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
279 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
280 static void FreeSDP( sdp_t *p_sdp );
282 /*****************************************************************************
283 * Open: initialize and create stuff
284 *****************************************************************************/
285 static int Open( vlc_object_t *p_this )
287 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
288 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
289 malloc( sizeof( services_discovery_sys_t ) );
291 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
299 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
300 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
303 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
309 /* Cache sap_timeshift value */
310 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" )
311 ? VLC_TRUE : VLC_FALSE;
313 /* Create our playlist node */
316 playlist_NodesPairCreate( pl_Get( p_sd ), _("SAP sessions"),
317 &p_sys->p_node_cat, &p_sys->p_node_one,
319 p_sys->p_node_cat->p_input->b_prefers_tree = VLC_TRUE;
320 p_sys->i_announces = 0;
321 p_sys->pp_announces = NULL;
326 /*****************************************************************************
327 * OpenDemux: initialize and create stuff
328 *****************************************************************************/
329 static int OpenDemux( vlc_object_t *p_this )
331 demux_t *p_demux = (demux_t *)p_this;
333 char *psz_sdp = NULL;
335 int errval = VLC_EGENERIC;
337 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
339 /* We want livedotcom module to parse this SDP file */
343 assert( p_demux->s ); /* this is NOT an access_demux */
346 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
349 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
352 /* Gather the complete sdp file */
355 #define SDP_MAX 65536
358 for( size_t buflen = 0; buflen < SDP_MAX; buflen += OFFSET )
360 char *psz_sdp_new = realloc( psz_sdp, buflen + 1 );
361 if( psz_sdp_new == NULL )
366 psz_sdp = psz_sdp_new;
368 ssize_t i_read = stream_Read( p_demux->s, psz_sdp + buflen, OFFSET );
371 msg_Err( p_demux, "cannot read SDP" );
375 psz_sdp[buflen + i_read] = '\0';
377 if( i_read < OFFSET )
382 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
386 msg_Warn( p_demux, "invalid SDP");
390 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
392 p_sdp->psz_uri = NULL;
394 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
395 p_sdp->i_media_type != 14 )
398 if( p_sdp->psz_uri == NULL ) goto error;
400 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
401 p_demux->p_sys->p_sdp = p_sdp;
402 p_demux->pf_control = Control;
403 p_demux->pf_demux = Demux;
410 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
411 stream_Seek( p_demux->s, 0 );
415 /*****************************************************************************
417 *****************************************************************************/
418 static void Close( vlc_object_t *p_this )
420 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
421 services_discovery_sys_t *p_sys = p_sd->p_sys;
425 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
427 net_Close( p_sys->pi_fd[i] );
429 FREENULL( p_sys->pi_fd );
432 if( config_GetInt( p_sd, "sap-cache" ) )
438 for( i = p_sys->i_announces - 1; i>= 0; i-- )
440 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
442 FREENULL( p_sys->pp_announces );
444 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_cat, VLC_TRUE,
446 playlist_NodeDelete( pl_Get(p_sd), p_sys->p_node_one, VLC_TRUE,
452 /*****************************************************************************
453 * CloseDemux: Close the demuxer
454 *****************************************************************************/
455 static void CloseDemux( vlc_object_t *p_this )
457 demux_t *p_demux = (demux_t *)p_this;
460 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
461 free( p_demux->p_sys );
465 /*****************************************************************************
466 * Run: main SAP thread
467 *****************************************************************************
468 * Listens to SAP packets, and sends them to packet_handle
469 *****************************************************************************/
470 #define MAX_SAP_BUFFER 5000
472 static void Run( services_discovery_t *p_sd )
477 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
478 * DNS queries, even if the DNS server returns an error with milliseconds.
479 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
480 * Winsock 1.1 from Windows 95, if not Windows 3.1.
481 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
482 * we have to open sockets in Run() rather than Open(). */
483 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
485 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
486 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
487 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
488 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
490 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
492 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);
507 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
508 which if_nameindex uses internally anyway */
510 // first create a dummy socket to pin down the protocol family
511 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
512 if( s != INVALID_SOCKET )
514 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
515 size_t len = sizeof(ifaces);
517 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
519 unsigned ifcount = len/sizeof(INTERFACE_INFO);
520 char *ptr = strchr (psz_address, '%') + 1;
521 for(unsigned i = 1; i<=ifcount; ++i )
523 // append link-local zone identifier
524 sprintf(ptr, "%d", i);
530 *strchr (psz_address, '%') = '\0';
532 static const char ipv6_scopes[] = "1456789ABCDE";
533 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
535 psz_address[3] = *c_scope;
536 InitSocket( p_sd, psz_address, SAP_PORT );
540 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
541 if( psz_addr && *psz_addr )
543 InitSocket( p_sd, psz_addr, SAP_PORT );
547 if( p_sd->p_sys->i_fd == 0 )
549 msg_Err( p_sd, "unable to listen on any address" );
553 /* read SAP packets */
554 while( !p_sd->b_die )
557 uint8_t p_buffer[MAX_SAP_BUFFER+1];
559 i_read = net_Select( p_sd, p_sd->p_sys->pi_fd,
560 p_sd->p_sys->i_fd, p_buffer,
563 /* Check for items that need deletion */
564 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
566 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
568 if( mdate() - p_sd->p_sys->pp_announces[i]->i_last > i_timeout )
570 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i] );
574 /* Minimum length is > 6 */
579 msg_Warn( p_sd, "socket read error" );
584 p_buffer[i_read] = '\0';
586 /* Parse the packet */
587 ParseSAP( p_sd, p_buffer, i_read );
591 /**********************************************************************
592 * Demux: reads and demuxes data packets
593 * Return -1 if error, 0 if EOF, 1 else
594 **********************************************************************/
595 static int Demux( demux_t *p_demux )
597 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
598 input_thread_t *p_input;
599 input_item_t *p_parent_input;
601 playlist_t *p_playlist = pl_Yield( p_demux );
602 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
607 msg_Err( p_demux, "parent input could not be found" );
611 p_parent_input = input_GetItem(p_input);
613 vlc_mutex_lock( &p_parent_input->lock );
614 FREENULL( p_parent_input->psz_uri );
615 p_parent_input->psz_uri = strdup( p_sdp->psz_uri );
616 FREENULL( p_parent_input->psz_name );
617 p_parent_input->psz_name = strdup( p_sdp->psz_sessionname );
618 p_parent_input->i_type = ITEM_TYPE_NET;
620 if( p_playlist->status.p_item &&
621 p_playlist->status.p_item->p_input == p_parent_input )
623 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
624 p_playlist->status.p_node, p_playlist->status.p_item );
627 vlc_mutex_unlock( &p_parent_input->lock );
628 vlc_object_release( p_input );
629 vlc_object_release( p_playlist );
634 static int Control( demux_t *p_demux, int i_query, va_list args )
639 /**************************************************************
641 **************************************************************/
643 /* i_read is at least > 6 */
644 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
649 const uint8_t *end = buf + len;
652 assert (buf[len] == '\0');
657 uint8_t flags = buf[0];
659 /* First, check the sap announce is correct */
660 if ((flags >> 5) != 1)
663 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
664 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
668 msg_Dbg( p_sd, "encrypted packet, unsupported" );
672 vlc_bool_t b_compressed = (flags & 0x01) != 0;
674 uint16_t i_hash = U16_AT (buf + 2);
676 if( p_sd->p_sys->b_strict && i_hash == 0 )
678 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
682 // Skips source address and auth data
683 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
687 uint8_t *decomp = NULL;
690 int newsize = Decompress (buf, &decomp, end - buf);
693 msg_Dbg( p_sd, "decompression of SAP packet failed" );
697 decomp = realloc (decomp, newsize + 1);
698 decomp[newsize] = '\0';
699 psz_sdp = (const char *)decomp;
704 psz_sdp = (const char *)buf;
708 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
709 assert( psz_sdp[len] == '\0');
711 /* Skip payload type */
712 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
713 if (strncmp (psz_sdp, "v=0", 3))
715 size_t clen = strlen (psz_sdp) + 1;
717 if (strcmp (psz_sdp, "application/sdp"))
719 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
723 // skips content type
732 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
737 p_sdp->psz_sdp = psz_sdp;
739 /* Decide whether we should add a playlist item for this SDP */
740 /* Parse connection information (c= & m= ) */
741 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
742 p_sdp->psz_uri = NULL;
744 /* Multi-media or no-parse -> pass to LIVE.COM */
745 if( ( p_sdp->i_media_type != 14
746 && p_sdp->i_media_type != 32
747 && p_sdp->i_media_type != 33)
748 || p_sd->p_sys->b_parse == VLC_FALSE )
750 free( p_sdp->psz_uri );
751 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
752 p_sdp->psz_uri = NULL;
755 if( p_sdp->psz_uri == NULL ) return VLC_EGENERIC;
757 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
760 /* FIXME: we create a new announce each time the sdp changes */
761 if( IsSameSession( p_sd->p_sys->pp_announces[i]->p_sdp, p_sdp ) )
765 RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
769 p_sd->p_sys->pp_announces[i]->i_last = mdate();
771 FreeSDP( p_sdp ); p_sdp = NULL;
776 CreateAnnounce( p_sd, i_hash, p_sdp );
782 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
785 input_item_t *p_input;
786 playlist_item_t *p_item, *p_child;
787 const char *psz_value;
788 sap_announce_t *p_sap = (sap_announce_t *)malloc(
789 sizeof(sap_announce_t ) );
790 services_discovery_sys_t *p_sys;
796 p_sap->i_last = mdate();
797 p_sap->i_hash = i_hash;
798 p_sap->p_sdp = p_sdp;
800 /* Create the actual playlist item here */
801 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
802 p_sap->p_sdp->psz_uri,
803 p_sdp->psz_sessionname,
804 0, NULL, -1, ITEM_TYPE_NET );
805 p_sap->i_input_id = p_input->i_id;
812 if( p_sys->b_timeshift )
813 input_ItemAddOption( p_input, ":access-filter=timeshift" );
815 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
816 if( psz_value != NULL )
818 input_ItemAddInfo( p_input, _("Session"),_("Tool"), psz_value );
820 if( strcmp( p_sdp->username, "-" ) )
822 input_ItemAddInfo( p_input, _("Session"),
823 _("User"), p_sdp->username );
827 if (p_sap->p_sdp->mediac >= 1)
828 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
830 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
832 if( psz_value != NULL )
834 p_child = playlist_ChildSearchName( p_sys->p_node_cat, psz_value );
836 if( p_child == NULL )
838 p_child = playlist_NodeCreate( pl_Get( p_sd ), psz_value,
839 p_sys->p_node_cat, 0 );
840 p_child->i_flags &= ~PLAYLIST_SKIP_FLAG;
845 p_child = p_sys->p_node_cat;
848 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input, p_child,
849 PLAYLIST_APPEND, PLAYLIST_END, VLC_FALSE );
850 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
851 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
852 p_sap->i_item_id_cat = p_item->i_id;
854 p_item = playlist_NodeAddInput( pl_Get( p_sd ), p_input,
855 p_sys->p_node_one, PLAYLIST_APPEND, PLAYLIST_END,
857 p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
858 p_item->i_flags &= ~PLAYLIST_SAVE_FLAG;
859 p_sap->i_item_id_one = p_item->i_id;
861 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
867 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
870 /* Look for media attribute, and fallback to session */
871 return GetAttribute (sdp->mediav[media].pp_attributes,
872 sdp->mediav[media].i_attributes, name)
873 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
877 /* Fill p_sdp->psz_uri */
878 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
880 if (p_sdp->mediac == 0)
882 msg_Dbg (p_obj, "Ignoring SDP with no media");
886 for (unsigned i = 1; i < p_sdp->mediac; i++)
888 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
889 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
890 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
891 p_sdp->mediav->addrlen))
893 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
898 if (p_sdp->mediav->n_addr != 1)
900 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
909 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
910 p_sdp->mediav->addrlen, psz_uri + 1,
911 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
914 if (strchr (psz_uri + 1, ':'))
917 psz_uri[strlen (psz_uri)] = ']';
923 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
924 if (sdp_proto == NULL)
927 char *subtype = strchr (sdp_proto, ' ');
930 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
931 p_sdp->i_media_type = 0;
936 p_sdp->i_media_type = atoi (subtype);
938 if (p_sdp->i_media_type == 0)
939 p_sdp->i_media_type = 33;
941 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
942 * 0x1: Connection-Oriented media. */
943 static const char proto_match[] =
945 "RTP/AVP\0" "rtp\0\0"
946 "UDPLite/RTP/AVP\0" "udplite\0\0"
947 "DCCP/RTP/AVP\0" "dccp\0\1"
948 "TCP/RTP/AVP\0" "rtptcp\0\1"
951 const char *vlc_proto = NULL;
953 for (const char *proto = proto_match; *proto;)
955 if (strcasecmp (proto, sdp_proto) == 0)
957 vlc_proto = proto + strlen (proto) + 1;
958 flags = vlc_proto[strlen (vlc_proto) + 1];
961 proto += strlen (proto) + 1;
962 proto += strlen (proto) + 2;
966 if (vlc_proto == NULL)
968 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
969 p_sdp->mediav[0].fmt);
975 /* Connection-oriented media */
976 const char *setup = FindAttribute (p_sdp, 0, "setup");
978 setup = "active"; /* default value */
980 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
982 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
986 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
992 /* Non-connected (normally multicast) media */
994 char psz_source[258] = "";
995 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
998 char psz_source_ip[256];
1001 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1002 psz_source_ip) == 2)
1004 /* According to RFC4570, FQDNs can be used for source-filters,
1005 * but -seriously- this is impractical */
1011 struct in6_addr addr;
1012 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1013 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1014 sizeof (psz_source) - 2) != NULL))
1016 psz_source[0] = '[';
1017 psz_source[strlen (psz_source)] = ']';
1024 struct in_addr addr;
1025 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1026 && (inet_ntop (AF_INET, &addr, psz_source,
1027 sizeof (psz_source)) == NULL))
1035 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1044 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1045 socklen_t *addrlen, unsigned *number)
1048 unsigned fam, n1, n2;
1050 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1058 addr->ss_family = AF_INET6;
1062 *addrlen = sizeof (struct sockaddr_in6);
1064 if (inet_pton (AF_INET6, host,
1065 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1068 *number = (res >= 3) ? n1 : 1;
1073 addr->ss_family = AF_INET;
1077 *addrlen = sizeof (struct sockaddr_in);
1079 if (inet_pton (AF_INET, host,
1080 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1083 *number = (res >= 4) ? n2 : 1;
1093 /***********************************************************************
1094 * ParseSDP : SDP parsing
1095 * *********************************************************************
1096 * Validate SDP and parse all fields
1097 ***********************************************************************/
1098 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1100 if( psz_sdp == NULL )
1103 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1108 struct sockaddr_storage glob_addr;
1109 memset (&glob_addr, 0, sizeof (glob_addr));
1110 socklen_t glob_len = 0;
1111 unsigned glob_count = 1;
1114 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1117 /* Extract one line */
1118 char *eol = strchr (psz_sdp, '\n');
1119 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1120 char line[linelen + 1];
1121 memcpy (line, psz_sdp, linelen);
1122 line[linelen] = '\0';
1124 psz_sdp += linelen + 1;
1126 /* Remove carriage return if present */
1127 eol = strchr (line, '\r');
1130 linelen = eol - line;
1131 line[linelen] = '\0';
1135 char cat = line[0], *data = line + 2;
1136 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1138 /* MUST ignore SDP with unknown line type */
1139 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1144 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1148 assert (linelen >= 2);
1150 /* SDP parsing state machine
1151 * We INTERNALLY use uppercase for session, lowercase for media
1155 /* Session description */
1160 msg_Dbg (p_obj, "missing SDP version");
1163 if (strcmp (data, "0"))
1165 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1175 msg_Dbg (p_obj, "missing SDP originator");
1179 if ((sscanf (data, "%63s "I64Fu" "I64Fu" IN IP%u %1023s",
1180 p_sdp->username, &p_sdp->session_id,
1181 &p_sdp->session_version, &p_sdp->orig_ip_version,
1182 p_sdp->orig_host) != 5)
1183 || ((p_sdp->orig_ip_version != 4)
1184 && (p_sdp->orig_ip_version != 6)))
1186 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1187 /* Or maybe out-of-range, but this looks suspicious */
1190 EnsureUTF8 (p_sdp->orig_host);
1197 if ((cat != 's') || !*data)
1199 /* MUST be present AND non-empty */
1200 msg_Dbg (p_obj, "missing SDP session name");
1203 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1204 p_sdp->psz_sessionname = strdup (data);
1205 EnsureUTF8 (p_sdp->psz_sessionname);
1206 if (p_sdp->psz_sessionname == NULL)
1231 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1234 msg_Dbg (p_obj, "SDP connection infos not supported: "
1241 assert (expect == 'B');
1248 msg_Dbg (p_obj, "missing SDP time description");
1254 if ((cat == 't') || (cat == 'r'))
1269 attribute_t *p_attr = MakeAttribute (data);
1270 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1274 /* Media description */
1281 msg_Dbg (p_obj, "missing SDP media description");
1284 struct sdp_media_t *m;
1285 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1293 memset (m, 0, sizeof (*m));
1294 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1295 m->n_addr = glob_count;
1297 /* TODO: remember media type (if we need multiple medias) */
1298 data = strchr (data, ' ');
1301 msg_Dbg (p_obj, "missing SDP media port");
1304 port = atoi (++data);
1305 if (port <= 0 || port >= 65536)
1307 msg_Dbg (p_obj, "invalid transport port %d", port);
1310 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1312 data = strchr (data, ' ');
1315 msg_Dbg (p_obj, "missing SDP media format");
1318 m->fmt = strdup (++data);
1332 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1333 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1336 msg_Dbg (p_obj, "SDP connection infos not supported: "
1340 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1352 assert (expect == 'a');
1355 attribute_t *p_attr = MakeAttribute (data);
1359 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1360 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1369 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1375 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1387 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1390 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1392 return VLC_EGENERIC;
1394 shutdown( i_fd, SHUT_WR );
1395 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1396 p_sd->p_sys->i_fd, i_fd);
1400 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1403 int i_result, i_dstsize, n = 0;
1404 unsigned char *psz_dst = NULL;
1407 memset (&d_stream, 0, sizeof (d_stream));
1409 i_result = inflateInit(&d_stream);
1410 if( i_result != Z_OK )
1413 d_stream.next_in = (Bytef *)psz_src;
1414 d_stream.avail_in = i_len;
1419 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1420 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1421 d_stream.avail_out = 1000;
1423 i_result = inflate(&d_stream, Z_NO_FLUSH);
1424 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1426 inflateEnd( &d_stream );
1430 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1431 ( i_result != Z_STREAM_END ) );
1433 i_dstsize = d_stream.total_out;
1434 inflateEnd( &d_stream );
1436 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1448 static void FreeSDP( sdp_t *p_sdp )
1450 free( p_sdp->psz_sessionname );
1451 free( p_sdp->psz_uri );
1453 for (unsigned j = 0; j < p_sdp->mediac; j++)
1455 free (p_sdp->mediav[j].fmt);
1456 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1457 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1458 free (p_sdp->mediav[j].pp_attributes);
1460 free (p_sdp->mediav);
1462 for (int i = 0; i < p_sdp->i_attributes; i++)
1463 FreeAttribute (p_sdp->pp_attributes[i]);
1465 free (p_sdp->pp_attributes);
1469 static int RemoveAnnounce( services_discovery_t *p_sd,
1470 sap_announce_t *p_announce )
1474 if( p_announce->p_sdp )
1476 FreeSDP( p_announce->p_sdp );
1477 p_announce->p_sdp = NULL;
1480 if( p_announce->i_input_id > -1 )
1481 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1483 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1485 if( p_sd->p_sys->pp_announces[i] == p_announce )
1487 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1498 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1500 /* A session is identified by
1503 * - network type (which is always IN),
1504 * - address type (currently, this means IP version),
1507 if (strcmp (p_sdp1->username, p_sdp2->username)
1508 || (p_sdp1->session_id != p_sdp2->session_id)
1509 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1510 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1517 static inline attribute_t *MakeAttribute (const char *str)
1519 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1523 strcpy (a->name, str);
1524 EnsureUTF8 (a->name);
1525 char *value = strchr (a->name, ':');
1537 static const char *GetAttribute (attribute_t **tab, unsigned n,
1540 for (unsigned i = 0; i < n; i++)
1541 if (strcasecmp (tab[i]->name, name) == 0)
1542 return tab[i]->value;
1547 static inline void FreeAttribute (attribute_t *a)