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 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
37 #include <vlc_demux.h>
38 #include <vlc_services_discovery.h>
40 #include <vlc_network.h>
41 #include <vlc_charset.h>
49 #ifdef HAVE_SYS_TIME_H
50 # include <sys/time.h>
64 /************************************************************************
65 * Macros and definitions
66 ************************************************************************/
68 #define MAX_LINE_LENGTH 256
70 /* SAP is always on that port */
72 /* Global-scope SAP address */
73 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
74 /* Organization-local SAP address */
75 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
76 /* Local (smallest non-link-local scope) SAP address */
77 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
78 /* Link-local SAP address */
79 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
82 /*****************************************************************************
84 *****************************************************************************/
85 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
86 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
87 "right addresses to listen to. However, you " \
88 "can specify a specific address." )
89 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
90 #define SAP_IPV4_LONGTEXT N_( \
91 "Listen to IPv4 announcements on the standard addresses." )
92 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
93 #define SAP_IPV6_LONGTEXT N_( \
94 "Listen to IPv6 announcements on the standard addresses." )
95 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
96 #define SAP_SCOPE_LONGTEXT N_( \
97 "Scope for IPv6 announcements (default is 8)." )
98 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
99 #define SAP_TIMEOUT_LONGTEXT N_( \
100 "Delay after which SAP items get deleted if no new announcement " \
102 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
103 #define SAP_PARSE_LONGTEXT N_( \
104 "This enables actual parsing of the announces by the SAP module. " \
105 "Otherwise, all announcements are parsed by the \"live555\" " \
106 "(RTP/RTSP) module." )
107 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
108 #define SAP_STRICT_LONGTEXT N_( \
109 "When this is set, the SAP parser will discard some non-compliant " \
111 #define SAP_CACHE_TEXT N_("Use SAP cache")
112 #define SAP_CACHE_LONGTEXT N_( \
113 "This enables a SAP caching mechanism. " \
114 "This will result in lower SAP startup time, but you could end up " \
115 "with items corresponding to legacy streams." )
116 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
117 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
118 "for streams discovered through SAP announcements." )
121 static int Open ( vlc_object_t * );
122 static void Close( vlc_object_t * );
123 static int OpenDemux ( vlc_object_t * );
124 static void CloseDemux ( vlc_object_t * );
127 set_shortname( N_("SAP"))
128 set_description( N_("SAP Announcements") )
129 set_category( CAT_PLAYLIST )
130 set_subcategory( SUBCAT_PLAYLIST_SD )
132 add_string( "sap-addr", NULL, NULL,
133 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true );
134 add_bool( "sap-ipv4", 1 , NULL,
135 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, true );
136 add_bool( "sap-ipv6", 1 , NULL,
137 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, true );
138 add_integer( "sap-timeout", 1800, NULL,
139 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true );
140 add_bool( "sap-parse", 1 , NULL,
141 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true );
142 add_bool( "sap-strict", 0 , NULL,
143 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true );
145 add_bool( "sap-cache", 0 , NULL,
146 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, true );
148 add_bool( "sap-timeshift", 0 , NULL,
149 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, true );
151 set_capability( "services_discovery", 0 )
152 set_callbacks( Open, Close )
155 set_description( N_("SDP Descriptions parser") )
156 add_shortcut( "sdp" )
157 set_capability( "demux", 51 )
158 set_callbacks( OpenDemux, CloseDemux )
162 /*****************************************************************************
164 *****************************************************************************/
166 typedef struct sdp_t sdp_t;
167 typedef struct attribute_t attribute_t;
168 typedef struct sap_announce_t sap_announce_t;
173 struct sdp_t *parent;
175 struct sockaddr_storage addr;
179 attribute_t **pp_attributes;
183 /* The structure that contains sdp information */
191 uint64_t session_version;
192 unsigned orig_ip_version;
193 char orig_host[1024];
196 char *psz_sessionname;
203 /* a= global attributes */
205 attribute_t **pp_attributes;
207 /* medias (well, we only support one atm) */
209 struct sdp_media_t *mediav;
218 struct sap_announce_t
222 uint8_t i_period_trust;
225 uint32_t i_source[4];
227 /* SAP annnounces must only contain one SDP */
230 input_item_t * p_item;
233 struct services_discovery_sys_t
237 /* Socket descriptors */
241 /* Table of announces */
243 struct sap_announce_t **pp_announces;
258 /*****************************************************************************
260 *****************************************************************************/
264 static int Demux( demux_t *p_demux );
265 static int Control( demux_t *, int, va_list );
266 static void *Run ( void *p_sd );
268 /* Main parsing functions */
269 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
270 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
271 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
272 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
273 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
275 /* Helper functions */
276 static inline attribute_t *MakeAttribute (const char *str);
277 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
278 static inline void FreeAttribute (attribute_t *a);
279 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
282 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
283 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
284 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
285 static void FreeSDP( sdp_t *p_sdp );
287 static inline int min_int( int a, int b )
289 return a > b ? b : a;
292 /*****************************************************************************
293 * Open: initialize and create stuff
294 *****************************************************************************/
295 static int Open( vlc_object_t *p_this )
297 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
298 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
299 malloc( sizeof( services_discovery_sys_t ) );
303 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
310 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
311 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
314 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
320 /* Cache sap_timeshift value */
321 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" );
323 p_sys->i_announces = 0;
324 p_sys->pp_announces = NULL;
325 /* TODO: create sockets here, and fix racy sockets table */
326 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
335 /*****************************************************************************
336 * OpenDemux: initialize and create stuff
337 *****************************************************************************/
338 static int OpenDemux( vlc_object_t *p_this )
340 demux_t *p_demux = (demux_t *)p_this;
341 const uint8_t *p_peek;
342 char *psz_sdp = NULL;
344 int errval = VLC_EGENERIC;
347 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
349 /* We want livedotcom module to parse this SDP file */
353 assert( p_demux->s ); /* this is NOT an access_demux */
356 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
359 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
362 /* Gather the complete sdp file */
363 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
365 const int i_read_max = 1024;
366 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
368 if( psz_sdp_new == NULL )
373 psz_sdp = psz_sdp_new;
375 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
376 if( (int)i_read < 0 )
378 msg_Err( p_demux, "cannot read SDP" );
383 psz_sdp[i_len] = '\0';
385 if( (int)i_read < i_read_max )
389 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
393 msg_Warn( p_demux, "invalid SDP");
397 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
399 p_sdp->psz_uri = NULL;
401 switch (p_sdp->i_media_type)
402 { /* Should be in sync with modules/demux/rtp.c */
403 case 0: /* PCMU/8000 */
404 case 8: /* PCMA/8000 */
405 case 10: /* L16/44100/2 */
406 case 11: /* L16/44100 */
407 case 14: /* MPA/90000 */
408 case 32: /* MPV/90000 */
409 case 33: /* MP2/90000 */
414 if( p_sdp->psz_uri == NULL ) goto error;
416 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
417 p_demux->p_sys->p_sdp = p_sdp;
418 p_demux->pf_control = Control;
419 p_demux->pf_demux = Demux;
426 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
427 stream_Seek( p_demux->s, 0 );
431 /*****************************************************************************
433 *****************************************************************************/
434 static void Close( vlc_object_t *p_this )
436 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
437 services_discovery_sys_t *p_sys = p_sd->p_sys;
440 vlc_cancel (p_sys->thread);
441 vlc_join (p_sys->thread, NULL);
443 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
445 net_Close( p_sys->pi_fd[i] );
447 FREENULL( p_sys->pi_fd );
450 if( config_GetInt( p_sd, "sap-cache" ) )
456 for( i = p_sys->i_announces - 1; i>= 0; i-- )
458 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
460 FREENULL( p_sys->pp_announces );
465 /*****************************************************************************
466 * CloseDemux: Close the demuxer
467 *****************************************************************************/
468 static void CloseDemux( vlc_object_t *p_this )
470 demux_t *p_demux = (demux_t *)p_this;
473 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
474 free( p_demux->p_sys );
478 /*****************************************************************************
479 * Run: main SAP thread
480 *****************************************************************************
481 * Listens to SAP packets, and sends them to packet_handle
482 *****************************************************************************/
483 #define MAX_SAP_BUFFER 5000
485 static void *Run( void *data )
487 services_discovery_t *p_sd = data;
491 int canc = vlc_savecancel ();
493 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
494 * DNS queries, even if the DNS server returns an error with milliseconds.
495 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
496 * Winsock 1.1 from Windows 95, if not Windows 3.1.
497 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
498 * we have to open sockets in Run() rather than Open(). */
499 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
501 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
502 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
503 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
504 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
506 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
508 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
511 struct if_nameindex *l = if_nameindex ();
514 char *ptr = strchr (psz_address, '%') + 1;
515 for (unsigned i = 0; l[i].if_index; i++)
517 strcpy (ptr, l[i].if_name);
518 InitSocket (p_sd, psz_address, SAP_PORT);
520 if_freenameindex (l);
523 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
524 which if_nameindex uses internally anyway */
526 // first create a dummy socket to pin down the protocol family
527 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
528 if( s != INVALID_SOCKET )
530 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
531 size_t len = sizeof(ifaces);
533 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
535 unsigned ifcount = len/sizeof(INTERFACE_INFO);
536 char *ptr = strchr (psz_address, '%') + 1;
537 for(unsigned i = 1; i<=ifcount; ++i )
539 // append link-local zone identifier
540 sprintf(ptr, "%d", i);
546 *strchr (psz_address, '%') = '\0';
548 static const char ipv6_scopes[] = "1456789ABCDE";
549 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
551 psz_address[3] = *c_scope;
552 InitSocket( p_sd, psz_address, SAP_PORT );
556 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
557 if( psz_addr && *psz_addr )
558 InitSocket( p_sd, psz_addr, SAP_PORT );
561 if( p_sd->p_sys->i_fd == 0 )
563 msg_Err( p_sd, "unable to listen on any address" );
567 /* read SAP packets */
570 vlc_restorecancel (canc);
571 unsigned n = p_sd->p_sys->i_fd;
572 struct pollfd ufd[n];
574 for (unsigned i = 0; i < n; i++)
576 ufd[i].fd = p_sd->p_sys->pi_fd[i];
577 ufd[i].events = POLLIN;
581 int val = poll (ufd, n, timeout);
582 canc = vlc_savecancel ();
585 for (unsigned i = 0; i < n; i++)
589 uint8_t p_buffer[MAX_SAP_BUFFER+1];
592 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
593 MAX_SAP_BUFFER, false);
595 msg_Warn (p_sd, "receive error: %m");
598 /* Parse the packet */
599 p_buffer[i_read] = '\0';
600 ParseSAP (p_sd, p_buffer, i_read);
606 mtime_t now = mdate();
608 /* A 1 hour timeout correspong to the RFC Implicit timeout.
609 * This timeout is tuned in the following loop. */
610 timeout = 1000 * 60 * 60;
612 /* Check for items that need deletion */
613 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
615 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
616 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
617 mtime_t i_last_period = now - p_announce->i_last;
619 /* Remove the annoucement, if the last announcement was 1 hour ago
620 * or if the last packet emitted was 3 times the average time
621 * between two packets */
622 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
623 i_last_period > i_timeout )
625 RemoveAnnounce( p_sd, p_announce );
629 /* Compute next timeout */
630 if( p_announce->i_period_trust > 5 )
631 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
632 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
636 if( !p_sd->p_sys->i_announces )
637 timeout = -1; /* We can safely poll indefinitly. */
638 else if( timeout < 200 )
639 timeout = 200; /* Don't wakeup too fast. */
644 /**********************************************************************
645 * Demux: reads and demuxes data packets
646 * Return -1 if error, 0 if EOF, 1 else
647 **********************************************************************/
648 static int Demux( demux_t *p_demux )
650 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
651 input_thread_t *p_input;
652 input_item_t *p_parent_input;
654 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
659 msg_Err( p_demux, "parent input could not be found" );
663 /* This item hasn't been held by input_GetItem
664 * don't release it */
665 p_parent_input = input_GetItem( p_input );
667 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
668 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
670 vlc_mutex_lock( &p_parent_input->lock );
672 p_parent_input->i_type = ITEM_TYPE_NET;
674 vlc_mutex_unlock( &p_parent_input->lock );
678 static int Control( demux_t *p_demux, int i_query, va_list args )
680 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
684 /**************************************************************
686 **************************************************************/
688 /* i_read is at least > 6 */
689 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
694 const uint8_t *end = buf + len;
697 assert (buf[len] == '\0');
702 uint8_t flags = buf[0];
704 /* First, check the sap announce is correct */
705 if ((flags >> 5) != 1)
708 bool b_ipv6 = (flags & 0x10) != 0;
709 bool b_need_delete = (flags & 0x04) != 0;
713 msg_Dbg( p_sd, "encrypted packet, unsupported" );
717 bool b_compressed = (flags & 0x01) != 0;
719 uint16_t i_hash = U16_AT (buf + 2);
721 if( p_sd->p_sys->b_strict && i_hash == 0 )
723 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
727 // Skips source address and auth data
728 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
732 uint8_t *decomp = NULL;
735 int newsize = Decompress (buf, &decomp, end - buf);
738 msg_Dbg( p_sd, "decompression of SAP packet failed" );
742 decomp = realloc (decomp, newsize + 1);
743 decomp[newsize] = '\0';
744 psz_sdp = (const char *)decomp;
749 psz_sdp = (const char *)buf;
753 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
754 assert( psz_sdp[len] == '\0');
756 /* Skip payload type */
757 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
758 if (strncmp (psz_sdp, "v=0", 3))
760 size_t clen = strlen (psz_sdp) + 1;
762 if (strcmp (psz_sdp, "application/sdp"))
764 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
768 // skips content type
777 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
782 p_sdp->psz_sdp = psz_sdp;
784 /* Decide whether we should add a playlist item for this SDP */
785 /* Parse connection information (c= & m= ) */
786 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
787 p_sdp->psz_uri = NULL;
789 /* Multi-media or no-parse -> pass to LIVE.COM */
790 if( ( p_sdp->i_media_type != 14
791 && p_sdp->i_media_type != 32
792 && p_sdp->i_media_type != 33)
793 || p_sd->p_sys->b_parse == false )
795 free( p_sdp->psz_uri );
796 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
797 p_sdp->psz_uri = NULL;
800 if( p_sdp->psz_uri == NULL )
806 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
808 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
810 /* FIXME: we create a new announce each time the sdp changes */
811 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
813 /* We don't support delete announcement as they can easily
814 * Be used to highjack an announcement by a third party.
815 * Intead we cleverly implement Implicit Announcement removal.
817 * if( b_need_delete )
818 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
824 /* No need to go after six, as we start to trust the
825 * average period at six */
826 if( p_announce->i_period_trust <= 5 )
827 p_announce->i_period_trust++;
829 /* Compute the average period */
830 mtime_t now = mdate();
831 p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
832 p_announce->i_last = now;
834 FreeSDP( p_sdp ); p_sdp = NULL;
839 CreateAnnounce( p_sd, i_hash, p_sdp );
845 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
848 input_item_t *p_input;
849 const char *psz_value;
850 sap_announce_t *p_sap = (sap_announce_t *)malloc(
851 sizeof(sap_announce_t ) );
852 services_discovery_sys_t *p_sys;
858 p_sap->i_last = mdate();
860 p_sap->i_period_trust = 0;
861 p_sap->i_hash = i_hash;
862 p_sap->p_sdp = p_sdp;
864 /* Released in RemoveAnnounce */
865 p_input = input_item_NewWithType( VLC_OBJECT(p_sd),
866 p_sap->p_sdp->psz_uri,
867 p_sdp->psz_sessionname,
868 0, NULL, -1, ITEM_TYPE_NET );
869 p_sap->p_item = p_input;
876 if( p_sys->b_timeshift )
877 input_item_AddOption( p_input, ":access-filter=timeshift" );
879 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
880 if( psz_value != NULL )
882 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
884 if( strcmp( p_sdp->username, "-" ) )
886 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
891 if (p_sap->p_sdp->mediac >= 1)
892 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
894 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
896 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
898 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
904 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
907 /* Look for media attribute, and fallback to session */
908 return GetAttribute (sdp->mediav[media].pp_attributes,
909 sdp->mediav[media].i_attributes, name)
910 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
914 /* Fill p_sdp->psz_uri */
915 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
917 if (p_sdp->mediac == 0)
919 msg_Dbg (p_obj, "Ignoring SDP with no media");
923 for (unsigned i = 1; i < p_sdp->mediac; i++)
925 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
926 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
927 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
928 p_sdp->mediav->addrlen))
930 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
935 if (p_sdp->mediav->n_addr != 1)
937 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
946 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
947 p_sdp->mediav->addrlen, psz_uri + 1,
948 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
951 if (strchr (psz_uri + 1, ':'))
954 strcat (psz_uri, "]");
960 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
961 if (sdp_proto == NULL)
964 char *subtype = strchr (sdp_proto, ' ');
967 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
974 /* FIXME: check for multiple payload types in RTP/AVP case.
975 * FIXME: check for "mpeg" subtype in raw udp case. */
976 if (!strcasecmp (sdp_proto, "udp"))
977 p_sdp->i_media_type = 33;
979 p_sdp->i_media_type = atoi (subtype);
982 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
983 * 0x1: Connection-Oriented media. */
984 static const char proto_match[] =
986 "RTP/AVP\0" "rtp\0\0"
987 "UDPLite/RTP/AVP\0" "udplite\0\0"
988 "DCCP/RTP/AVP\0" "dccp\0\1"
989 "TCP/RTP/AVP\0" "rtptcp\0\1"
992 const char *vlc_proto = NULL;
994 for (const char *proto = proto_match; *proto;)
996 if (strcasecmp (proto, sdp_proto) == 0)
998 vlc_proto = proto + strlen (proto) + 1;
999 flags = vlc_proto[strlen (vlc_proto) + 1];
1002 proto += strlen (proto) + 1;
1003 proto += strlen (proto) + 2;
1007 if (vlc_proto == NULL)
1009 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1010 p_sdp->mediav[0].fmt);
1011 return VLC_EGENERIC;
1016 /* Connection-oriented media */
1017 const char *setup = FindAttribute (p_sdp, 0, "setup");
1019 setup = "active"; /* default value */
1021 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1023 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1024 return VLC_EGENERIC;
1027 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1033 /* Non-connected (normally multicast) media */
1035 char psz_source[258] = "";
1036 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1037 if (sfilter != NULL)
1039 char psz_source_ip[256];
1042 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1043 psz_source_ip) == 2)
1045 /* According to RFC4570, FQDNs can be used for source-filters,
1046 * but -seriously- this is impractical */
1052 struct in6_addr addr;
1053 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1054 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1055 sizeof (psz_source) - 2) != NULL))
1057 psz_source[0] = '[';
1058 psz_source[strlen (psz_source)] = ']';
1065 struct in_addr addr;
1066 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1067 && (inet_ntop (AF_INET, &addr, psz_source,
1068 sizeof (psz_source)) == NULL))
1076 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1085 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1086 socklen_t *addrlen, unsigned *number)
1089 unsigned fam, n1, n2;
1091 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1099 addr->ss_family = AF_INET6;
1103 *addrlen = sizeof (struct sockaddr_in6);
1105 if (inet_pton (AF_INET6, host,
1106 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1109 *number = (res >= 3) ? n1 : 1;
1114 addr->ss_family = AF_INET;
1118 *addrlen = sizeof (struct sockaddr_in);
1120 if (inet_pton (AF_INET, host,
1121 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1124 *number = (res >= 4) ? n2 : 1;
1134 /***********************************************************************
1135 * ParseSDP : SDP parsing
1136 * *********************************************************************
1137 * Validate SDP and parse all fields
1138 ***********************************************************************/
1139 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1141 if( psz_sdp == NULL )
1144 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1149 struct sockaddr_storage glob_addr;
1150 memset (&glob_addr, 0, sizeof (glob_addr));
1151 socklen_t glob_len = 0;
1152 unsigned glob_count = 1;
1155 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1158 /* Extract one line */
1159 char *eol = strchr (psz_sdp, '\n');
1160 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1161 char line[linelen + 1];
1162 memcpy (line, psz_sdp, linelen);
1163 line[linelen] = '\0';
1165 psz_sdp += linelen + 1;
1167 /* Remove carriage return if present */
1168 eol = strchr (line, '\r');
1171 linelen = eol - line;
1172 line[linelen] = '\0';
1176 char cat = line[0], *data = line + 2;
1177 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1179 /* MUST ignore SDP with unknown line type */
1180 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1185 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1189 assert (linelen >= 2);
1191 /* SDP parsing state machine
1192 * We INTERNALLY use uppercase for session, lowercase for media
1196 /* Session description */
1201 msg_Dbg (p_obj, "missing SDP version");
1204 if (strcmp (data, "0"))
1206 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1216 msg_Dbg (p_obj, "missing SDP originator");
1220 if ((sscanf (data, "%63s %"PRIu64" %"PRIu64" IN IP%u %1023s",
1221 p_sdp->username, &p_sdp->session_id,
1222 &p_sdp->session_version, &p_sdp->orig_ip_version,
1223 p_sdp->orig_host) != 5)
1224 || ((p_sdp->orig_ip_version != 4)
1225 && (p_sdp->orig_ip_version != 6)))
1227 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1228 /* Or maybe out-of-range, but this looks suspicious */
1231 EnsureUTF8 (p_sdp->orig_host);
1238 if ((cat != 's') || !*data)
1240 /* MUST be present AND non-empty */
1241 msg_Dbg (p_obj, "missing SDP session name");
1244 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1245 p_sdp->psz_sessionname = strdup (data);
1246 if (p_sdp->psz_sessionname == NULL)
1248 EnsureUTF8 (p_sdp->psz_sessionname);
1272 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1275 msg_Dbg (p_obj, "SDP connection infos not supported: "
1282 assert (expect == 'B');
1289 msg_Dbg (p_obj, "missing SDP time description");
1295 if ((cat == 't') || (cat == 'r'))
1310 attribute_t *p_attr = MakeAttribute (data);
1311 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1315 /* Media description */
1322 msg_Dbg (p_obj, "missing SDP media description");
1325 struct sdp_media_t *m;
1326 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1334 memset (m, 0, sizeof (*m));
1335 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1336 m->n_addr = glob_count;
1338 /* TODO: remember media type (if we need multiple medias) */
1339 data = strchr (data, ' ');
1342 msg_Dbg (p_obj, "missing SDP media port");
1345 port = atoi (++data);
1346 if (port <= 0 || port >= 65536)
1348 msg_Dbg (p_obj, "invalid transport port %d", port);
1351 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1353 data = strchr (data, ' ');
1356 msg_Dbg (p_obj, "missing SDP media format");
1359 m->fmt = strdup (++data);
1373 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1374 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1377 msg_Dbg (p_obj, "SDP connection infos not supported: "
1381 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1393 assert (expect == 'a');
1396 attribute_t *p_attr = MakeAttribute (data);
1400 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1401 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1410 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1416 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1428 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1431 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1433 return VLC_EGENERIC;
1435 shutdown( i_fd, SHUT_WR );
1436 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1437 p_sd->p_sys->i_fd, i_fd);
1441 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1444 int i_result, i_dstsize, n = 0;
1445 unsigned char *psz_dst = NULL;
1448 memset (&d_stream, 0, sizeof (d_stream));
1450 i_result = inflateInit(&d_stream);
1451 if( i_result != Z_OK )
1454 d_stream.next_in = (Bytef *)psz_src;
1455 d_stream.avail_in = i_len;
1460 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1461 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1462 d_stream.avail_out = 1000;
1464 i_result = inflate(&d_stream, Z_NO_FLUSH);
1465 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1467 inflateEnd( &d_stream );
1471 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1472 ( i_result != Z_STREAM_END ) );
1474 i_dstsize = d_stream.total_out;
1475 inflateEnd( &d_stream );
1477 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1489 static void FreeSDP( sdp_t *p_sdp )
1491 free( p_sdp->psz_sessionname );
1492 free( p_sdp->psz_uri );
1494 for (unsigned j = 0; j < p_sdp->mediac; j++)
1496 free (p_sdp->mediav[j].fmt);
1497 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1498 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1499 free (p_sdp->mediav[j].pp_attributes);
1501 free (p_sdp->mediav);
1503 for (int i = 0; i < p_sdp->i_attributes; i++)
1504 FreeAttribute (p_sdp->pp_attributes[i]);
1506 free (p_sdp->pp_attributes);
1510 static int RemoveAnnounce( services_discovery_t *p_sd,
1511 sap_announce_t *p_announce )
1515 if( p_announce->p_sdp )
1517 FreeSDP( p_announce->p_sdp );
1518 p_announce->p_sdp = NULL;
1521 if( p_announce->p_item )
1523 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1524 vlc_gc_decref( p_announce->p_item );
1525 p_announce->p_item = NULL;
1528 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1530 if( p_sd->p_sys->pp_announces[i] == p_announce )
1532 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1543 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1545 /* A session is identified by
1548 * - network type (which is always IN),
1549 * - address type (currently, this means IP version),
1552 if (strcmp (p_sdp1->username, p_sdp2->username)
1553 || (p_sdp1->session_id != p_sdp2->session_id)
1554 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1555 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1562 static inline attribute_t *MakeAttribute (const char *str)
1564 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1568 strcpy (a->name, str);
1569 EnsureUTF8 (a->name);
1570 char *value = strchr (a->name, ':');
1582 static const char *GetAttribute (attribute_t **tab, unsigned n,
1585 for (unsigned i = 0; i < n; i++)
1586 if (strcasecmp (tab[i]->name, name) == 0)
1587 return tab[i]->value;
1592 static inline void FreeAttribute (attribute_t *a)