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." )
118 static int Open ( vlc_object_t * );
119 static void Close( vlc_object_t * );
120 static int OpenDemux ( vlc_object_t * );
121 static void CloseDemux ( vlc_object_t * );
124 set_shortname( N_("SAP"))
125 set_description( N_("SAP Announcements") )
126 set_category( CAT_PLAYLIST )
127 set_subcategory( SUBCAT_PLAYLIST_SD )
129 add_string( "sap-addr", NULL, NULL,
130 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true )
131 add_bool( "sap-ipv4", 1 , NULL,
132 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, true )
133 add_bool( "sap-ipv6", 1 , NULL,
134 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, true )
135 add_integer( "sap-timeout", 1800, NULL,
136 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true )
137 add_bool( "sap-parse", 1 , NULL,
138 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true )
139 add_bool( "sap-strict", 0 , NULL,
140 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true )
142 add_bool( "sap-cache", 0 , NULL,
143 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, true )
145 add_obsolete_bool( "sap-timeshift" ) /* Redumdant since 1.0.0 */
147 set_capability( "services_discovery", 0 )
148 set_callbacks( Open, Close )
151 set_description( N_("SDP Descriptions parser") )
152 add_shortcut( "sdp" )
153 set_capability( "demux", 51 )
154 set_callbacks( OpenDemux, CloseDemux )
158 /*****************************************************************************
160 *****************************************************************************/
162 typedef struct sdp_t sdp_t;
163 typedef struct attribute_t attribute_t;
164 typedef struct sap_announce_t sap_announce_t;
169 struct sdp_t *parent;
171 struct sockaddr_storage addr;
175 attribute_t **pp_attributes;
179 /* The structure that contains sdp information */
187 uint64_t session_version;
188 unsigned orig_ip_version;
189 char orig_host[1024];
192 char *psz_sessionname;
200 /* a= global attributes */
202 attribute_t **pp_attributes;
204 /* medias (well, we only support one atm) */
206 struct sdp_media_t *mediav;
215 struct sap_announce_t
219 uint8_t i_period_trust;
222 uint32_t i_source[4];
224 /* SAP annnounces must only contain one SDP */
227 input_item_t * p_item;
230 struct services_discovery_sys_t
234 /* Socket descriptors */
238 /* Table of announces */
240 struct sap_announce_t **pp_announces;
254 /*****************************************************************************
256 *****************************************************************************/
260 static int Demux( demux_t *p_demux );
261 static int Control( demux_t *, int, va_list );
262 static void *Run ( void *p_sd );
264 /* Main parsing functions */
265 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
266 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
267 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
268 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
269 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
271 /* Helper functions */
272 static inline attribute_t *MakeAttribute (const char *str);
273 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
274 static inline void FreeAttribute (attribute_t *a);
275 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
278 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
279 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
280 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
281 static void FreeSDP( sdp_t *p_sdp );
283 static inline int min_int( int a, int b )
285 return a > b ? b : a;
288 /*****************************************************************************
289 * Open: initialize and create stuff
290 *****************************************************************************/
291 static int Open( vlc_object_t *p_this )
293 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
294 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
295 malloc( sizeof( services_discovery_sys_t ) );
299 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
306 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
307 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
310 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
316 p_sys->i_announces = 0;
317 p_sys->pp_announces = NULL;
318 /* TODO: create sockets here, and fix racy sockets table */
319 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
328 /*****************************************************************************
329 * OpenDemux: initialize and create stuff
330 *****************************************************************************/
331 static int OpenDemux( vlc_object_t *p_this )
333 demux_t *p_demux = (demux_t *)p_this;
334 const uint8_t *p_peek;
335 char *psz_sdp = NULL;
337 int errval = VLC_EGENERIC;
340 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
342 /* We want livedotcom module to parse this SDP file */
346 assert( p_demux->s ); /* this is NOT an access_demux */
349 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
352 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
355 /* Gather the complete sdp file */
356 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
358 const int i_read_max = 1024;
359 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
361 if( psz_sdp_new == NULL )
366 psz_sdp = psz_sdp_new;
368 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
369 if( (int)i_read < 0 )
371 msg_Err( p_demux, "cannot read SDP" );
376 psz_sdp[i_len] = '\0';
378 if( (int)i_read < i_read_max )
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 switch (p_sdp->i_media_type)
395 { /* Should be in sync with modules/demux/rtp.c */
396 case 0: /* PCMU/8000 */
397 case 8: /* PCMA/8000 */
398 case 10: /* L16/44100/2 */
399 case 11: /* L16/44100 */
400 case 14: /* MPA/90000 */
401 case 32: /* MPV/90000 */
402 case 33: /* MP2/90000 */
407 if( p_sdp->psz_uri == NULL ) goto error;
409 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
410 p_demux->p_sys->p_sdp = p_sdp;
411 p_demux->pf_control = Control;
412 p_demux->pf_demux = Demux;
419 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
420 stream_Seek( p_demux->s, 0 );
424 /*****************************************************************************
426 *****************************************************************************/
427 static void Close( vlc_object_t *p_this )
429 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
430 services_discovery_sys_t *p_sys = p_sd->p_sys;
433 vlc_cancel (p_sys->thread);
434 vlc_join (p_sys->thread, NULL);
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 );
458 /*****************************************************************************
459 * CloseDemux: Close the demuxer
460 *****************************************************************************/
461 static void CloseDemux( vlc_object_t *p_this )
463 demux_t *p_demux = (demux_t *)p_this;
466 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
467 free( p_demux->p_sys );
471 /*****************************************************************************
472 * Run: main SAP thread
473 *****************************************************************************
474 * Listens to SAP packets, and sends them to packet_handle
475 *****************************************************************************/
476 #define MAX_SAP_BUFFER 5000
478 static void *Run( void *data )
480 services_discovery_t *p_sd = data;
484 int canc = vlc_savecancel ();
486 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
487 * DNS queries, even if the DNS server returns an error with milliseconds.
488 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
489 * Winsock 1.1 from Windows 95, if not Windows 3.1.
490 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
491 * we have to open sockets in Run() rather than Open(). */
492 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
494 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
495 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
496 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
497 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
499 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
501 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
504 struct if_nameindex *l = if_nameindex ();
507 char *ptr = strchr (psz_address, '%') + 1;
508 for (unsigned i = 0; l[i].if_index; i++)
510 strcpy (ptr, l[i].if_name);
511 InitSocket (p_sd, psz_address, SAP_PORT);
513 if_freenameindex (l);
516 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
517 which if_nameindex uses internally anyway */
519 // first create a dummy socket to pin down the protocol family
520 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
521 if( s != INVALID_SOCKET )
523 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
524 size_t len = sizeof(ifaces);
526 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
528 unsigned ifcount = len/sizeof(INTERFACE_INFO);
529 char *ptr = strchr (psz_address, '%') + 1;
530 for(unsigned i = 1; i<=ifcount; ++i )
532 // append link-local zone identifier
533 sprintf(ptr, "%d", i);
539 *strchr (psz_address, '%') = '\0';
541 static const char ipv6_scopes[] = "1456789ABCDE";
542 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
544 psz_address[3] = *c_scope;
545 InitSocket( p_sd, psz_address, SAP_PORT );
549 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
550 if( psz_addr && *psz_addr )
551 InitSocket( p_sd, psz_addr, SAP_PORT );
554 if( p_sd->p_sys->i_fd == 0 )
556 msg_Err( p_sd, "unable to listen on any address" );
560 /* read SAP packets */
563 vlc_restorecancel (canc);
564 unsigned n = p_sd->p_sys->i_fd;
565 struct pollfd ufd[n];
567 for (unsigned i = 0; i < n; i++)
569 ufd[i].fd = p_sd->p_sys->pi_fd[i];
570 ufd[i].events = POLLIN;
574 int val = poll (ufd, n, timeout);
575 canc = vlc_savecancel ();
578 for (unsigned i = 0; i < n; i++)
582 uint8_t p_buffer[MAX_SAP_BUFFER+1];
585 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
586 MAX_SAP_BUFFER, false);
588 msg_Warn (p_sd, "receive error: %m");
591 /* Parse the packet */
592 p_buffer[i_read] = '\0';
593 ParseSAP (p_sd, p_buffer, i_read);
599 mtime_t now = mdate();
601 /* A 1 hour timeout correspong to the RFC Implicit timeout.
602 * This timeout is tuned in the following loop. */
603 timeout = 1000 * 60 * 60;
605 /* Check for items that need deletion */
606 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
608 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
609 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
610 mtime_t i_last_period = now - p_announce->i_last;
612 /* Remove the annoucement, if the last announcement was 1 hour ago
613 * or if the last packet emitted was 3 times the average time
614 * between two packets */
615 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
616 i_last_period > i_timeout )
618 RemoveAnnounce( p_sd, p_announce );
622 /* Compute next timeout */
623 if( p_announce->i_period_trust > 5 )
624 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
625 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
629 if( !p_sd->p_sys->i_announces )
630 timeout = -1; /* We can safely poll indefinitly. */
631 else if( timeout < 200 )
632 timeout = 200; /* Don't wakeup too fast. */
637 /**********************************************************************
638 * Demux: reads and demuxes data packets
639 * Return -1 if error, 0 if EOF, 1 else
640 **********************************************************************/
641 static int Demux( demux_t *p_demux )
643 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
644 input_thread_t *p_input;
645 input_item_t *p_parent_input;
647 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
652 msg_Err( p_demux, "parent input could not be found" );
656 /* This item hasn't been held by input_GetItem
657 * don't release it */
658 p_parent_input = input_GetItem( p_input );
660 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
661 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
662 if( p_sdp->rtcp_port )
665 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
667 input_item_AddOption( p_parent_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
672 vlc_mutex_lock( &p_parent_input->lock );
674 p_parent_input->i_type = ITEM_TYPE_NET;
676 vlc_mutex_unlock( &p_parent_input->lock );
680 static int Control( demux_t *p_demux, int i_query, va_list args )
682 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
686 /**************************************************************
688 **************************************************************/
690 /* i_read is at least > 6 */
691 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
696 const uint8_t *end = buf + len;
699 assert (buf[len] == '\0');
704 uint8_t flags = buf[0];
706 /* First, check the sap announce is correct */
707 if ((flags >> 5) != 1)
710 bool b_ipv6 = (flags & 0x10) != 0;
711 bool b_need_delete = (flags & 0x04) != 0;
715 msg_Dbg( p_sd, "encrypted packet, unsupported" );
719 bool b_compressed = (flags & 0x01) != 0;
721 uint16_t i_hash = U16_AT (buf + 2);
723 if( p_sd->p_sys->b_strict && i_hash == 0 )
725 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
729 // Skips source address and auth data
730 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
734 uint8_t *decomp = NULL;
737 int newsize = Decompress (buf, &decomp, end - buf);
740 msg_Dbg( p_sd, "decompression of SAP packet failed" );
744 decomp = realloc (decomp, newsize + 1);
745 decomp[newsize] = '\0';
746 psz_sdp = (const char *)decomp;
751 psz_sdp = (const char *)buf;
755 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
756 assert( psz_sdp[len] == '\0');
758 /* Skip payload type */
759 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
760 if (strncmp (psz_sdp, "v=0", 3))
762 size_t clen = strlen (psz_sdp) + 1;
764 if (strcmp (psz_sdp, "application/sdp"))
766 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
770 // skips content type
779 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
784 p_sdp->psz_sdp = psz_sdp;
786 /* Decide whether we should add a playlist item for this SDP */
787 /* Parse connection information (c= & m= ) */
788 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
789 p_sdp->psz_uri = NULL;
791 /* Multi-media or no-parse -> pass to LIVE.COM */
792 if( ( p_sdp->i_media_type != 14
793 && p_sdp->i_media_type != 32
794 && p_sdp->i_media_type != 33)
795 || p_sd->p_sys->b_parse == false )
797 free( p_sdp->psz_uri );
798 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
799 p_sdp->psz_uri = NULL;
802 if( p_sdp->psz_uri == NULL )
808 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
810 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
812 /* FIXME: we create a new announce each time the sdp changes */
813 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
815 /* We don't support delete announcement as they can easily
816 * Be used to highjack an announcement by a third party.
817 * Intead we cleverly implement Implicit Announcement removal.
819 * if( b_need_delete )
820 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
826 /* No need to go after six, as we start to trust the
827 * average period at six */
828 if( p_announce->i_period_trust <= 5 )
829 p_announce->i_period_trust++;
831 /* Compute the average period */
832 mtime_t now = mdate();
833 p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
834 p_announce->i_last = now;
836 FreeSDP( p_sdp ); p_sdp = NULL;
841 CreateAnnounce( p_sd, i_hash, p_sdp );
847 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
850 input_item_t *p_input;
851 const char *psz_value;
852 sap_announce_t *p_sap = (sap_announce_t *)malloc(
853 sizeof(sap_announce_t ) );
854 services_discovery_sys_t *p_sys;
860 p_sap->i_last = mdate();
862 p_sap->i_period_trust = 0;
863 p_sap->i_hash = i_hash;
864 p_sap->p_sdp = p_sdp;
866 /* Released in RemoveAnnounce */
867 p_input = input_item_NewWithType( VLC_OBJECT(p_sd),
868 p_sap->p_sdp->psz_uri,
869 p_sdp->psz_sessionname,
870 0, NULL, 0, -1, ITEM_TYPE_NET );
871 p_sap->p_item = p_input;
878 if( p_sdp->rtcp_port )
881 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
883 input_item_AddOption( p_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
888 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
889 if( psz_value != NULL )
891 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
893 if( strcmp( p_sdp->username, "-" ) )
895 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
900 if (p_sap->p_sdp->mediac >= 1)
901 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
903 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
905 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
907 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
913 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
916 /* Look for media attribute, and fallback to session */
917 return GetAttribute (sdp->mediav[media].pp_attributes,
918 sdp->mediav[media].i_attributes, name)
919 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
923 /* Fill p_sdp->psz_uri */
924 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
926 if (p_sdp->mediac == 0)
928 msg_Dbg (p_obj, "Ignoring SDP with no media");
932 for (unsigned i = 1; i < p_sdp->mediac; i++)
934 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
935 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
936 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
937 p_sdp->mediav->addrlen))
939 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
944 if (p_sdp->mediav->n_addr != 1)
946 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
955 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
956 p_sdp->mediav->addrlen, psz_uri + 1,
957 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
960 if (strchr (psz_uri + 1, ':'))
963 strcat (psz_uri, "]");
969 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
970 if (sdp_proto == NULL)
973 char *subtype = strchr (sdp_proto, ' ');
976 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
983 /* FIXME: check for multiple payload types in RTP/AVP case.
984 * FIXME: check for "mpeg" subtype in raw udp case. */
985 if (!strcasecmp (sdp_proto, "udp"))
986 p_sdp->i_media_type = 33;
988 p_sdp->i_media_type = atoi (subtype);
991 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
992 * 0x1: Connection-Oriented media. */
993 static const char proto_match[] =
995 "RTP/AVP\0" "rtp\0\0"
996 "UDPLite/RTP/AVP\0" "udplite\0\0"
997 "DCCP/RTP/AVP\0" "dccp\0\1"
998 "TCP/RTP/AVP\0" "rtptcp\0\1"
1001 const char *vlc_proto = NULL;
1003 for (const char *proto = proto_match; *proto;)
1005 if (strcasecmp (proto, sdp_proto) == 0)
1007 vlc_proto = proto + strlen (proto) + 1;
1008 flags = vlc_proto[strlen (vlc_proto) + 1];
1011 proto += strlen (proto) + 1;
1012 proto += strlen (proto) + 2;
1016 if (vlc_proto == NULL)
1018 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1019 p_sdp->mediav[0].fmt);
1020 return VLC_EGENERIC;
1023 if (!strcmp (vlc_proto, "udp") || FindAttribute (p_sdp, 0, "rtcp-mux"))
1024 p_sdp->rtcp_port = 0;
1027 const char *rtcp = FindAttribute (p_sdp, 0, "rtcp");
1029 p_sdp->rtcp_port = atoi (rtcp);
1031 if (port & 1) /* odd port -> RTCP; next even port -> RTP */
1032 p_sdp->rtcp_port = port++;
1033 else /* even port -> RTP; next odd port -> RTCP */
1034 p_sdp->rtcp_port = port + 1;
1039 /* Connection-oriented media */
1040 const char *setup = FindAttribute (p_sdp, 0, "setup");
1042 setup = "active"; /* default value */
1044 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1046 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1047 return VLC_EGENERIC;
1050 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1056 /* Non-connected (normally multicast) media */
1057 char psz_source[258] = "";
1058 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1059 if (sfilter != NULL)
1061 char psz_source_ip[256];
1064 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1065 psz_source_ip) == 2)
1067 /* According to RFC4570, FQDNs can be used for source-filters,
1068 * but -seriously- this is impractical */
1074 struct in6_addr addr;
1075 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1076 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1077 sizeof (psz_source) - 2) != NULL))
1079 psz_source[0] = '[';
1080 psz_source[strlen (psz_source)] = ']';
1087 struct in_addr addr;
1088 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1089 && (inet_ntop (AF_INET, &addr, psz_source,
1090 sizeof (psz_source)) == NULL))
1098 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1107 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1108 socklen_t *addrlen, unsigned *number)
1111 unsigned fam, n1, n2;
1113 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1121 addr->ss_family = AF_INET6;
1125 *addrlen = sizeof (struct sockaddr_in6);
1127 if (inet_pton (AF_INET6, host,
1128 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1131 *number = (res >= 3) ? n1 : 1;
1136 addr->ss_family = AF_INET;
1140 *addrlen = sizeof (struct sockaddr_in);
1142 if (inet_pton (AF_INET, host,
1143 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1146 *number = (res >= 4) ? n2 : 1;
1156 /***********************************************************************
1157 * ParseSDP : SDP parsing
1158 * *********************************************************************
1159 * Validate SDP and parse all fields
1160 ***********************************************************************/
1161 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1163 if( psz_sdp == NULL )
1166 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1171 struct sockaddr_storage glob_addr;
1172 memset (&glob_addr, 0, sizeof (glob_addr));
1173 socklen_t glob_len = 0;
1174 unsigned glob_count = 1;
1177 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1180 /* Extract one line */
1181 char *eol = strchr (psz_sdp, '\n');
1182 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1183 char line[linelen + 1];
1184 memcpy (line, psz_sdp, linelen);
1185 line[linelen] = '\0';
1187 psz_sdp += linelen + 1;
1189 /* Remove carriage return if present */
1190 eol = strchr (line, '\r');
1193 linelen = eol - line;
1194 line[linelen] = '\0';
1198 char cat = line[0], *data = line + 2;
1199 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1201 /* MUST ignore SDP with unknown line type */
1202 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1207 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1211 assert (linelen >= 2);
1213 /* SDP parsing state machine
1214 * We INTERNALLY use uppercase for session, lowercase for media
1218 /* Session description */
1223 msg_Dbg (p_obj, "missing SDP version");
1226 if (strcmp (data, "0"))
1228 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1238 msg_Dbg (p_obj, "missing SDP originator");
1242 if ((sscanf (data, "%63s %"PRIu64" %"PRIu64" IN IP%u %1023s",
1243 p_sdp->username, &p_sdp->session_id,
1244 &p_sdp->session_version, &p_sdp->orig_ip_version,
1245 p_sdp->orig_host) != 5)
1246 || ((p_sdp->orig_ip_version != 4)
1247 && (p_sdp->orig_ip_version != 6)))
1249 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1250 /* Or maybe out-of-range, but this looks suspicious */
1253 EnsureUTF8 (p_sdp->orig_host);
1260 if ((cat != 's') || !*data)
1262 /* MUST be present AND non-empty */
1263 msg_Dbg (p_obj, "missing SDP session name");
1266 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1267 p_sdp->psz_sessionname = strdup (data);
1268 if (p_sdp->psz_sessionname == NULL)
1270 EnsureUTF8 (p_sdp->psz_sessionname);
1294 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1297 msg_Dbg (p_obj, "SDP connection infos not supported: "
1304 assert (expect == 'B');
1311 msg_Dbg (p_obj, "missing SDP time description");
1317 if ((cat == 't') || (cat == 'r'))
1332 attribute_t *p_attr = MakeAttribute (data);
1333 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1337 /* Media description */
1344 msg_Dbg (p_obj, "missing SDP media description");
1347 struct sdp_media_t *m;
1348 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1356 memset (m, 0, sizeof (*m));
1357 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1358 m->n_addr = glob_count;
1360 /* TODO: remember media type (if we need multiple medias) */
1361 data = strchr (data, ' ');
1364 msg_Dbg (p_obj, "missing SDP media port");
1367 port = atoi (++data);
1368 if (port <= 0 || port >= 65536)
1370 msg_Dbg (p_obj, "invalid transport port %d", port);
1373 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1375 data = strchr (data, ' ');
1378 msg_Dbg (p_obj, "missing SDP media format");
1381 m->fmt = strdup (++data);
1395 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1396 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1399 msg_Dbg (p_obj, "SDP connection infos not supported: "
1403 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1415 assert (expect == 'a');
1418 attribute_t *p_attr = MakeAttribute (data);
1422 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1423 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1432 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1438 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1450 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1453 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1455 return VLC_EGENERIC;
1457 shutdown( i_fd, SHUT_WR );
1458 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1459 p_sd->p_sys->i_fd, i_fd);
1463 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1466 int i_result, i_dstsize, n = 0;
1467 unsigned char *psz_dst = NULL;
1470 memset (&d_stream, 0, sizeof (d_stream));
1472 i_result = inflateInit(&d_stream);
1473 if( i_result != Z_OK )
1476 d_stream.next_in = (Bytef *)psz_src;
1477 d_stream.avail_in = i_len;
1482 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1483 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1484 d_stream.avail_out = 1000;
1486 i_result = inflate(&d_stream, Z_NO_FLUSH);
1487 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1489 inflateEnd( &d_stream );
1493 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1494 ( i_result != Z_STREAM_END ) );
1496 i_dstsize = d_stream.total_out;
1497 inflateEnd( &d_stream );
1499 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1511 static void FreeSDP( sdp_t *p_sdp )
1513 free( p_sdp->psz_sessionname );
1514 free( p_sdp->psz_uri );
1516 for (unsigned j = 0; j < p_sdp->mediac; j++)
1518 free (p_sdp->mediav[j].fmt);
1519 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1520 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1521 free (p_sdp->mediav[j].pp_attributes);
1523 free (p_sdp->mediav);
1525 for (int i = 0; i < p_sdp->i_attributes; i++)
1526 FreeAttribute (p_sdp->pp_attributes[i]);
1528 free (p_sdp->pp_attributes);
1532 static int RemoveAnnounce( services_discovery_t *p_sd,
1533 sap_announce_t *p_announce )
1537 if( p_announce->p_sdp )
1539 FreeSDP( p_announce->p_sdp );
1540 p_announce->p_sdp = NULL;
1543 if( p_announce->p_item )
1545 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1546 vlc_gc_decref( p_announce->p_item );
1547 p_announce->p_item = NULL;
1550 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1552 if( p_sd->p_sys->pp_announces[i] == p_announce )
1554 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1565 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1567 /* A session is identified by
1570 * - network type (which is always IN),
1571 * - address type (currently, this means IP version),
1574 if (strcmp (p_sdp1->username, p_sdp2->username)
1575 || (p_sdp1->session_id != p_sdp2->session_id)
1576 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1577 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1584 static inline attribute_t *MakeAttribute (const char *str)
1586 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1590 strcpy (a->name, str);
1591 EnsureUTF8 (a->name);
1592 char *value = strchr (a->name, ':');
1604 static const char *GetAttribute (attribute_t **tab, unsigned n,
1607 for (unsigned i = 0; i < n; i++)
1608 if (strcasecmp (tab[i]->name, name) == 0)
1609 return tab[i]->value;
1614 static inline void FreeAttribute (attribute_t *a)