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>
48 #ifdef HAVE_SYS_TIME_H
49 # include <sys/time.h>
63 /************************************************************************
64 * Macros and definitions
65 ************************************************************************/
67 #define MAX_LINE_LENGTH 256
69 /* SAP is always on that port */
71 /* Global-scope SAP address */
72 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
73 /* Organization-local SAP address */
74 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
75 /* Local (smallest non-link-local scope) SAP address */
76 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
77 /* Link-local SAP address */
78 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
81 /*****************************************************************************
83 *****************************************************************************/
84 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
85 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
86 "right addresses to listen to. However, you " \
87 "can specify a specific address." )
88 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
89 #define SAP_IPV4_LONGTEXT N_( \
90 "Listen to IPv4 announcements on the standard addresses." )
91 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
92 #define SAP_IPV6_LONGTEXT N_( \
93 "Listen to IPv6 announcements on the standard addresses." )
94 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
95 #define SAP_SCOPE_LONGTEXT N_( \
96 "Scope for IPv6 announcements (default is 8)." )
97 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
98 #define SAP_TIMEOUT_LONGTEXT N_( \
99 "Delay after which SAP items get deleted if no new announcement " \
101 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
102 #define SAP_PARSE_LONGTEXT N_( \
103 "This enables actual parsing of the announces by the SAP module. " \
104 "Otherwise, all announcements are parsed by the \"live555\" " \
105 "(RTP/RTSP) module." )
106 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
107 #define SAP_STRICT_LONGTEXT N_( \
108 "When this is set, the SAP parser will discard some non-compliant " \
110 #define SAP_CACHE_TEXT N_("Use SAP cache")
111 #define SAP_CACHE_LONGTEXT N_( \
112 "This enables a SAP caching mechanism. " \
113 "This will result in lower SAP startup time, but you could end up " \
114 "with items corresponding to legacy streams." )
117 static int Open ( vlc_object_t * );
118 static void Close( vlc_object_t * );
119 static int OpenDemux ( vlc_object_t * );
120 static void CloseDemux ( vlc_object_t * );
122 VLC_SD_PROBE_HELPER("sap", N_("Network streams (SAP)"))
125 set_shortname( N_("SAP"))
126 set_description( N_("SAP Announcements") )
127 set_category( CAT_PLAYLIST )
128 set_subcategory( SUBCAT_PLAYLIST_SD )
130 add_string( "sap-addr", NULL, NULL,
131 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true )
132 add_bool( "sap-ipv4", true, NULL,
133 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, true )
134 add_bool( "sap-ipv6", true, NULL,
135 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, true )
136 add_integer( "sap-timeout", 1800, NULL,
137 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true )
138 add_bool( "sap-parse", true, NULL,
139 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true )
140 add_bool( "sap-strict", false, NULL,
141 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true )
143 add_bool( "sap-cache", false, NULL,
144 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, true )
146 add_obsolete_bool( "sap-timeshift" ) /* Redumdant since 1.0.0 */
148 set_capability( "services_discovery", 0 )
149 set_callbacks( Open, Close )
151 VLC_SD_PROBE_SUBMODULE
154 set_description( N_("SDP Descriptions parser") )
155 add_shortcut( "sdp" )
156 set_capability( "demux", 51 )
157 set_callbacks( OpenDemux, CloseDemux )
161 /*****************************************************************************
163 *****************************************************************************/
165 typedef struct sdp_t sdp_t;
166 typedef struct attribute_t attribute_t;
167 typedef struct sap_announce_t sap_announce_t;
172 struct sdp_t *parent;
174 struct sockaddr_storage addr;
178 attribute_t **pp_attributes;
182 /* The structure that contains sdp information */
190 uint64_t session_version;
191 unsigned orig_ip_version;
192 char orig_host[1024];
195 char *psz_sessionname;
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;
257 /*****************************************************************************
259 *****************************************************************************/
263 static int Demux( demux_t *p_demux );
264 static int Control( demux_t *, int, va_list );
265 static void *Run ( void *p_sd );
267 /* Main parsing functions */
268 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
269 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
270 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
271 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
272 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
274 /* Helper functions */
275 static inline attribute_t *MakeAttribute (const char *str);
276 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
277 static inline void FreeAttribute (attribute_t *a);
278 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
281 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
282 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
283 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
284 static void FreeSDP( sdp_t *p_sdp );
286 static inline int min_int( int a, int b )
288 return a > b ? b : a;
291 static bool IsWellKnownPayload (int type)
294 { /* Should be in sync with modules/demux/rtp.c */
295 case 0: /* PCMU/8000 */
297 case 8: /* PCMA/8000 */
298 case 10: /* L16/44100/2 */
299 case 11: /* L16/44100 */
301 case 14: /* MPA/90000 */
302 case 32: /* MPV/90000 */
303 case 33: /* MP2/90000 */
309 /*****************************************************************************
310 * Open: initialize and create stuff
311 *****************************************************************************/
312 static int Open( vlc_object_t *p_this )
314 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
315 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
316 malloc( sizeof( services_discovery_sys_t ) );
320 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
327 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
328 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
331 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
337 p_sys->i_announces = 0;
338 p_sys->pp_announces = NULL;
339 /* TODO: create sockets here, and fix racy sockets table */
340 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
349 /*****************************************************************************
350 * OpenDemux: initialize and create stuff
351 *****************************************************************************/
352 static int OpenDemux( vlc_object_t *p_this )
354 demux_t *p_demux = (demux_t *)p_this;
355 const uint8_t *p_peek;
356 char *psz_sdp = NULL;
358 int errval = VLC_EGENERIC;
361 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
363 /* We want livedotcom module to parse this SDP file */
367 assert( p_demux->s ); /* this is NOT an access_demux */
370 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
373 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
376 /* Gather the complete sdp file */
377 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
379 const int i_read_max = 1024;
380 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
382 if( psz_sdp_new == NULL )
387 psz_sdp = psz_sdp_new;
389 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
390 if( (int)i_read < 0 )
392 msg_Err( p_demux, "cannot read SDP" );
397 psz_sdp[i_len] = '\0';
399 if( (int)i_read < i_read_max )
403 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
407 msg_Warn( p_demux, "invalid SDP");
411 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
413 p_sdp->psz_uri = NULL;
415 if (!IsWellKnownPayload (p_sdp->i_media_type))
417 if( p_sdp->psz_uri == NULL ) goto error;
419 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
420 if( unlikely( !p_demux->p_sys ) )
422 p_demux->p_sys->p_sdp = p_sdp;
423 p_demux->pf_control = Control;
424 p_demux->pf_demux = Demux;
431 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
432 stream_Seek( p_demux->s, 0 );
436 /*****************************************************************************
438 *****************************************************************************/
439 static void Close( vlc_object_t *p_this )
441 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
442 services_discovery_sys_t *p_sys = p_sd->p_sys;
445 vlc_cancel (p_sys->thread);
446 vlc_join (p_sys->thread, NULL);
448 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
450 net_Close( p_sys->pi_fd[i] );
452 FREENULL( p_sys->pi_fd );
455 if( config_GetInt( p_sd, "sap-cache" ) )
461 for( i = p_sys->i_announces - 1; i>= 0; i-- )
463 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
465 FREENULL( p_sys->pp_announces );
470 /*****************************************************************************
471 * CloseDemux: Close the demuxer
472 *****************************************************************************/
473 static void CloseDemux( vlc_object_t *p_this )
475 demux_t *p_demux = (demux_t *)p_this;
477 if( p_demux->p_sys->p_sdp )
478 FreeSDP( p_demux->p_sys->p_sdp );
479 free( p_demux->p_sys );
482 /*****************************************************************************
483 * Run: main SAP thread
484 *****************************************************************************
485 * Listens to SAP packets, and sends them to packet_handle
486 *****************************************************************************/
487 #define MAX_SAP_BUFFER 5000
489 static void *Run( void *data )
491 services_discovery_t *p_sd = data;
495 int canc = vlc_savecancel ();
497 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
498 * DNS queries, even if the DNS server returns an error with milliseconds.
499 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
500 * Winsock 1.1 from Windows 95, if not Windows 3.1.
501 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
502 * we have to open sockets in Run() rather than Open(). */
503 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
505 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
506 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
507 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
508 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
510 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
512 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
515 struct if_nameindex *l = if_nameindex ();
518 char *ptr = strchr (psz_address, '%') + 1;
519 for (unsigned i = 0; l[i].if_index; i++)
521 strcpy (ptr, l[i].if_name);
522 InitSocket (p_sd, psz_address, SAP_PORT);
524 if_freenameindex (l);
527 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
528 which if_nameindex uses internally anyway */
530 // first create a dummy socket to pin down the protocol family
531 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
532 if( s != INVALID_SOCKET )
534 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
535 size_t len = sizeof(ifaces);
537 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
539 unsigned ifcount = len/sizeof(INTERFACE_INFO);
540 char *ptr = strchr (psz_address, '%') + 1;
541 for(unsigned i = 1; i<=ifcount; ++i )
543 // append link-local zone identifier
544 sprintf(ptr, "%d", i);
550 *strchr (psz_address, '%') = '\0';
552 static const char ipv6_scopes[] = "1456789ABCDE";
553 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
555 psz_address[3] = *c_scope;
556 InitSocket( p_sd, psz_address, SAP_PORT );
560 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
561 if( psz_addr && *psz_addr )
562 InitSocket( p_sd, psz_addr, SAP_PORT );
565 if( p_sd->p_sys->i_fd == 0 )
567 msg_Err( p_sd, "unable to listen on any address" );
571 /* read SAP packets */
574 vlc_restorecancel (canc);
575 unsigned n = p_sd->p_sys->i_fd;
576 struct pollfd ufd[n];
578 for (unsigned i = 0; i < n; i++)
580 ufd[i].fd = p_sd->p_sys->pi_fd[i];
581 ufd[i].events = POLLIN;
585 int val = poll (ufd, n, timeout);
586 canc = vlc_savecancel ();
589 for (unsigned i = 0; i < n; i++)
593 uint8_t p_buffer[MAX_SAP_BUFFER+1];
596 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
597 MAX_SAP_BUFFER, false);
599 msg_Warn (p_sd, "receive error: %m");
602 /* Parse the packet */
603 p_buffer[i_read] = '\0';
604 ParseSAP (p_sd, p_buffer, i_read);
610 mtime_t now = mdate();
612 /* A 1 hour timeout correspong to the RFC Implicit timeout.
613 * This timeout is tuned in the following loop. */
614 timeout = 1000 * 60 * 60;
616 /* Check for items that need deletion */
617 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
619 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
620 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
621 mtime_t i_last_period = now - p_announce->i_last;
623 /* Remove the annoucement, if the last announcement was 1 hour ago
624 * or if the last packet emitted was 3 times the average time
625 * between two packets */
626 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
627 i_last_period > i_timeout )
629 RemoveAnnounce( p_sd, p_announce );
633 /* Compute next timeout */
634 if( p_announce->i_period_trust > 5 )
635 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
636 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
640 if( !p_sd->p_sys->i_announces )
641 timeout = -1; /* We can safely poll indefinitly. */
642 else if( timeout < 200 )
643 timeout = 200; /* Don't wakeup too fast. */
648 /**********************************************************************
649 * Demux: reads and demuxes data packets
650 * Return -1 if error, 0 if EOF, 1 else
651 **********************************************************************/
652 static int Demux( demux_t *p_demux )
654 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
655 input_thread_t *p_input;
656 input_item_t *p_parent_input;
658 p_input = demux_GetParentInput( p_demux );
662 msg_Err( p_demux, "parent input could not be found" );
666 /* This item hasn't been held by input_GetItem
667 * don't release it */
668 p_parent_input = input_GetItem( p_input );
670 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
671 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
672 if( p_sdp->rtcp_port )
675 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
677 input_item_AddOption( p_parent_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
682 vlc_mutex_lock( &p_parent_input->lock );
684 p_parent_input->i_type = ITEM_TYPE_NET;
686 vlc_mutex_unlock( &p_parent_input->lock );
687 vlc_object_release( p_input );
691 static int Control( demux_t *p_demux, int i_query, va_list args )
693 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
697 /**************************************************************
699 **************************************************************/
701 /* i_read is at least > 6 */
702 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
707 const uint8_t *end = buf + len;
710 assert (buf[len] == '\0');
715 uint8_t flags = buf[0];
717 /* First, check the sap announce is correct */
718 if ((flags >> 5) != 1)
721 bool b_ipv6 = (flags & 0x10) != 0;
722 bool b_need_delete = (flags & 0x04) != 0;
726 msg_Dbg( p_sd, "encrypted packet, unsupported" );
730 bool b_compressed = (flags & 0x01) != 0;
732 uint16_t i_hash = U16_AT (buf + 2);
734 if( p_sd->p_sys->b_strict && i_hash == 0 )
736 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
740 // Skips source address and auth data
741 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
745 uint8_t *decomp = NULL;
748 int newsize = Decompress (buf, &decomp, end - buf);
751 msg_Dbg( p_sd, "decompression of SAP packet failed" );
755 decomp = realloc (decomp, newsize + 1);
756 decomp[newsize] = '\0';
757 psz_sdp = (const char *)decomp;
762 psz_sdp = (const char *)buf;
766 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
767 assert( psz_sdp[len] == '\0');
769 /* Skip payload type */
770 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
771 if (strncmp (psz_sdp, "v=0", 3))
773 size_t clen = strlen (psz_sdp) + 1;
775 if (strcmp (psz_sdp, "application/sdp"))
777 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
781 // skips content type
790 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
795 p_sdp->psz_sdp = psz_sdp;
797 /* Decide whether we should add a playlist item for this SDP */
798 /* Parse connection information (c= & m= ) */
799 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
800 p_sdp->psz_uri = NULL;
802 /* Multi-media or no-parse -> pass to LIVE.COM */
803 if( !IsWellKnownPayload( p_sdp->i_media_type ) || !p_sd->p_sys->b_parse )
805 free( p_sdp->psz_uri );
806 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
807 p_sdp->psz_uri = NULL;
810 if( p_sdp->psz_uri == NULL )
816 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
818 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
820 /* FIXME: we create a new announce each time the sdp changes */
821 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
823 /* We don't support delete announcement as they can easily
824 * Be used to highjack an announcement by a third party.
825 * Intead we cleverly implement Implicit Announcement removal.
827 * if( b_need_delete )
828 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
834 /* No need to go after six, as we start to trust the
835 * average period at six */
836 if( p_announce->i_period_trust <= 5 )
837 p_announce->i_period_trust++;
839 /* Compute the average period */
840 mtime_t now = mdate();
841 p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
842 p_announce->i_last = now;
844 FreeSDP( p_sdp ); p_sdp = NULL;
849 CreateAnnounce( p_sd, i_hash, p_sdp );
855 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
858 input_item_t *p_input;
859 const char *psz_value;
860 sap_announce_t *p_sap = (sap_announce_t *)malloc(
861 sizeof(sap_announce_t ) );
862 services_discovery_sys_t *p_sys;
868 p_sap->i_last = mdate();
870 p_sap->i_period_trust = 0;
871 p_sap->i_hash = i_hash;
872 p_sap->p_sdp = p_sdp;
874 /* Released in RemoveAnnounce */
875 p_input = input_item_NewWithType( VLC_OBJECT(p_sd),
876 p_sap->p_sdp->psz_uri,
877 p_sdp->psz_sessionname,
878 0, NULL, 0, -1, ITEM_TYPE_NET );
879 p_sap->p_item = p_input;
886 if( p_sdp->rtcp_port )
889 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
891 input_item_AddOption( p_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
896 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
897 if( psz_value != NULL )
899 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
901 if( strcmp( p_sdp->username, "-" ) )
903 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
908 if (p_sap->p_sdp->mediac >= 1)
909 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
911 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
913 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
915 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
921 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
924 /* Look for media attribute, and fallback to session */
925 const char *attr = GetAttribute (sdp->mediav[media].pp_attributes,
926 sdp->mediav[media].i_attributes, name);
928 attr = GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
933 /* Fill p_sdp->psz_uri */
934 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
936 if (p_sdp->mediac == 0)
938 msg_Dbg (p_obj, "Ignoring SDP with no media");
942 for (unsigned i = 1; i < p_sdp->mediac; i++)
944 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
945 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
946 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
947 p_sdp->mediav->addrlen))
949 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
954 if (p_sdp->mediav->n_addr != 1)
956 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
965 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
966 p_sdp->mediav->addrlen, psz_uri + 1,
967 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
970 if (strchr (psz_uri + 1, ':'))
973 strcat (psz_uri, "]");
979 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
980 if (sdp_proto == NULL)
983 char *subtype = strchr (sdp_proto, ' ');
986 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
993 /* FIXME: check for multiple payload types in RTP/AVP case.
994 * FIXME: check for "mpeg" subtype in raw udp case. */
995 if (!strcasecmp (sdp_proto, "udp"))
996 p_sdp->i_media_type = 33;
998 p_sdp->i_media_type = atoi (subtype);
1001 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
1002 * 0x1: Connection-Oriented media. */
1003 static const char proto_match[] =
1005 "RTP/AVP\0" "rtp\0\0"
1006 "UDPLite/RTP/AVP\0" "udplite\0\0"
1007 "DCCP/RTP/AVP\0" "dccp\0\1"
1008 "TCP/RTP/AVP\0" "rtptcp\0\1"
1011 const char *vlc_proto = NULL;
1013 for (const char *proto = proto_match; *proto;)
1015 if (strcasecmp (proto, sdp_proto) == 0)
1017 vlc_proto = proto + strlen (proto) + 1;
1018 flags = vlc_proto[strlen (vlc_proto) + 1];
1021 proto += strlen (proto) + 1;
1022 proto += strlen (proto) + 2;
1026 if (vlc_proto == NULL)
1028 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1029 p_sdp->mediav[0].fmt);
1030 return VLC_EGENERIC;
1033 if (!strcmp (vlc_proto, "udp") || FindAttribute (p_sdp, 0, "rtcp-mux"))
1034 p_sdp->rtcp_port = 0;
1037 const char *rtcp = FindAttribute (p_sdp, 0, "rtcp");
1039 p_sdp->rtcp_port = atoi (rtcp);
1041 if (port & 1) /* odd port -> RTCP; next even port -> RTP */
1042 p_sdp->rtcp_port = port++;
1043 else /* even port -> RTP; next odd port -> RTCP */
1044 p_sdp->rtcp_port = port + 1;
1049 /* Connection-oriented media */
1050 const char *setup = FindAttribute (p_sdp, 0, "setup");
1052 setup = "active"; /* default value */
1054 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1056 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1057 return VLC_EGENERIC;
1060 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1066 /* Non-connected (normally multicast) media */
1067 char psz_source[258] = "";
1068 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1069 if (sfilter != NULL)
1071 char psz_source_ip[256];
1074 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1075 psz_source_ip) == 2)
1077 /* According to RFC4570, FQDNs can be used for source-filters,
1078 * but -seriously- this is impractical */
1084 struct in6_addr addr;
1085 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1086 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1087 sizeof (psz_source) - 2) != NULL))
1089 psz_source[0] = '[';
1090 psz_source[strlen (psz_source)] = ']';
1097 struct in_addr addr;
1098 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1099 && (inet_ntop (AF_INET, &addr, psz_source,
1100 sizeof (psz_source)) == NULL))
1108 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1117 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1118 socklen_t *addrlen, unsigned *number)
1121 unsigned fam, n1, n2;
1123 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1131 addr->ss_family = AF_INET6;
1135 *addrlen = sizeof (struct sockaddr_in6);
1137 if (inet_pton (AF_INET6, host,
1138 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1141 *number = (res >= 3) ? n1 : 1;
1146 addr->ss_family = AF_INET;
1150 *addrlen = sizeof (struct sockaddr_in);
1152 if (inet_pton (AF_INET, host,
1153 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1156 *number = (res >= 4) ? n2 : 1;
1166 /***********************************************************************
1167 * ParseSDP : SDP parsing
1168 * *********************************************************************
1169 * Validate SDP and parse all fields
1170 ***********************************************************************/
1171 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1173 if( psz_sdp == NULL )
1176 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1181 struct sockaddr_storage glob_addr;
1182 memset (&glob_addr, 0, sizeof (glob_addr));
1183 socklen_t glob_len = 0;
1184 unsigned glob_count = 1;
1187 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1190 /* Extract one line */
1191 char *eol = strchr (psz_sdp, '\n');
1192 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1193 char line[linelen + 1];
1194 memcpy (line, psz_sdp, linelen);
1195 line[linelen] = '\0';
1197 psz_sdp += linelen + 1;
1199 /* Remove carriage return if present */
1200 eol = strchr (line, '\r');
1203 linelen = eol - line;
1204 line[linelen] = '\0';
1208 char cat = line[0], *data = line + 2;
1209 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1211 /* MUST ignore SDP with unknown line type */
1212 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1217 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1221 assert (linelen >= 2);
1223 /* SDP parsing state machine
1224 * We INTERNALLY use uppercase for session, lowercase for media
1228 /* Session description */
1233 msg_Dbg (p_obj, "missing SDP version");
1236 if (strcmp (data, "0"))
1238 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1248 msg_Dbg (p_obj, "missing SDP originator");
1252 if ((sscanf (data, "%63s %"SCNu64" %"SCNu64" IN IP%u %1023s",
1253 p_sdp->username, &p_sdp->session_id,
1254 &p_sdp->session_version, &p_sdp->orig_ip_version,
1255 p_sdp->orig_host) != 5)
1256 || ((p_sdp->orig_ip_version != 4)
1257 && (p_sdp->orig_ip_version != 6)))
1259 msg_Dbg (p_obj, "SDP origin not supported: %s", data);
1260 /* Or maybe out-of-range, but this looks suspicious */
1263 EnsureUTF8 (p_sdp->orig_host);
1270 if ((cat != 's') || !*data)
1272 /* MUST be present AND non-empty */
1273 msg_Dbg (p_obj, "missing SDP session name");
1276 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1277 p_sdp->psz_sessionname = strdup (data);
1278 if (p_sdp->psz_sessionname == NULL)
1280 EnsureUTF8 (p_sdp->psz_sessionname);
1304 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1307 msg_Dbg (p_obj, "SDP connection infos not supported: "
1314 assert (expect == 'B');
1321 msg_Dbg (p_obj, "missing SDP time description");
1327 if ((cat == 't') || (cat == 'r'))
1342 attribute_t *p_attr = MakeAttribute (data);
1343 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1347 /* Media description */
1354 msg_Dbg (p_obj, "missing SDP media description");
1357 struct sdp_media_t *m;
1358 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1366 memset (m, 0, sizeof (*m));
1367 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1368 m->n_addr = glob_count;
1370 /* TODO: remember media type (if we need multiple medias) */
1371 data = strchr (data, ' ');
1374 msg_Dbg (p_obj, "missing SDP media port");
1377 port = atoi (++data);
1378 if (port <= 0 || port >= 65536)
1380 msg_Dbg (p_obj, "invalid transport port %d", port);
1383 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1385 data = strchr (data, ' ');
1388 msg_Dbg (p_obj, "missing SDP media format");
1391 m->fmt = strdup (++data);
1405 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1406 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1409 msg_Dbg (p_obj, "SDP connection infos not supported: "
1413 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1425 assert (expect == 'a');
1428 attribute_t *p_attr = MakeAttribute (data);
1432 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1433 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1442 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1448 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1460 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1463 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1465 return VLC_EGENERIC;
1467 shutdown( i_fd, SHUT_WR );
1468 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1469 p_sd->p_sys->i_fd, i_fd);
1473 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1476 int i_result, i_dstsize, n = 0;
1477 unsigned char *psz_dst = NULL;
1480 memset (&d_stream, 0, sizeof (d_stream));
1482 i_result = inflateInit(&d_stream);
1483 if( i_result != Z_OK )
1486 d_stream.next_in = (Bytef *)psz_src;
1487 d_stream.avail_in = i_len;
1492 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1493 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1494 d_stream.avail_out = 1000;
1496 i_result = inflate(&d_stream, Z_NO_FLUSH);
1497 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1499 inflateEnd( &d_stream );
1504 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1505 ( i_result != Z_STREAM_END ) );
1507 i_dstsize = d_stream.total_out;
1508 inflateEnd( &d_stream );
1510 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1522 static void FreeSDP( sdp_t *p_sdp )
1524 free( p_sdp->psz_sessionname );
1525 free( p_sdp->psz_uri );
1527 for (unsigned j = 0; j < p_sdp->mediac; j++)
1529 free (p_sdp->mediav[j].fmt);
1530 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1531 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1532 free (p_sdp->mediav[j].pp_attributes);
1534 free (p_sdp->mediav);
1536 for (int i = 0; i < p_sdp->i_attributes; i++)
1537 FreeAttribute (p_sdp->pp_attributes[i]);
1539 free (p_sdp->pp_attributes);
1543 static int RemoveAnnounce( services_discovery_t *p_sd,
1544 sap_announce_t *p_announce )
1548 if( p_announce->p_sdp )
1550 FreeSDP( p_announce->p_sdp );
1551 p_announce->p_sdp = NULL;
1554 if( p_announce->p_item )
1556 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1557 vlc_gc_decref( p_announce->p_item );
1558 p_announce->p_item = NULL;
1561 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1563 if( p_sd->p_sys->pp_announces[i] == p_announce )
1565 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1576 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1578 /* A session is identified by
1581 * - network type (which is always IN),
1582 * - address type (currently, this means IP version),
1585 if (strcmp (p_sdp1->username, p_sdp2->username)
1586 || (p_sdp1->session_id != p_sdp2->session_id)
1587 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1588 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1595 static inline attribute_t *MakeAttribute (const char *str)
1597 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1601 strcpy (a->name, str);
1602 EnsureUTF8 (a->name);
1603 char *value = strchr (a->name, ':');
1615 static const char *GetAttribute (attribute_t **tab, unsigned n,
1618 for (unsigned i = 0; i < n; i++)
1619 if (strcasecmp (tab[i]->name, name) == 0)
1620 return tab[i]->value;
1625 static inline void FreeAttribute (attribute_t *a)