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" );
324 services_discovery_SetLocalizedName( p_sd, _("SAP") );
326 p_sys->i_announces = 0;
327 p_sys->pp_announces = NULL;
328 /* TODO: create sockets here, and fix racy sockets table */
329 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
338 /*****************************************************************************
339 * OpenDemux: initialize and create stuff
340 *****************************************************************************/
341 static int OpenDemux( vlc_object_t *p_this )
343 demux_t *p_demux = (demux_t *)p_this;
344 const uint8_t *p_peek;
345 char *psz_sdp = NULL;
347 int errval = VLC_EGENERIC;
350 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
352 /* We want livedotcom module to parse this SDP file */
356 assert( p_demux->s ); /* this is NOT an access_demux */
359 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
362 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
365 /* Gather the complete sdp file */
366 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
368 const int i_read_max = 1024;
369 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
371 if( psz_sdp_new == NULL )
376 psz_sdp = psz_sdp_new;
378 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
379 if( (int)i_read < 0 )
381 msg_Err( p_demux, "cannot read SDP" );
386 psz_sdp[i_len] = '\0';
388 if( (int)i_read < i_read_max )
392 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
396 msg_Warn( p_demux, "invalid SDP");
400 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
402 p_sdp->psz_uri = NULL;
404 switch (p_sdp->i_media_type)
405 { /* Should be in sync with modules/demux/rtp.c */
406 case 0: /* PCMU/8000 */
407 case 8: /* PCMA/8000 */
408 case 10: /* L16/44100/2 */
409 case 11: /* L16/44100 */
410 case 14: /* MPA/90000 */
411 case 32: /* MPV/90000 */
412 case 33: /* MP2/90000 */
417 if( p_sdp->psz_uri == NULL ) goto error;
419 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
420 p_demux->p_sys->p_sdp = p_sdp;
421 p_demux->pf_control = Control;
422 p_demux->pf_demux = Demux;
429 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
430 stream_Seek( p_demux->s, 0 );
434 /*****************************************************************************
436 *****************************************************************************/
437 static void Close( vlc_object_t *p_this )
439 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
440 services_discovery_sys_t *p_sys = p_sd->p_sys;
443 vlc_cancel (p_sys->thread);
444 vlc_join (p_sys->thread, NULL);
446 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
448 net_Close( p_sys->pi_fd[i] );
450 FREENULL( p_sys->pi_fd );
453 if( config_GetInt( p_sd, "sap-cache" ) )
459 for( i = p_sys->i_announces - 1; i>= 0; i-- )
461 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
463 FREENULL( p_sys->pp_announces );
468 /*****************************************************************************
469 * CloseDemux: Close the demuxer
470 *****************************************************************************/
471 static void CloseDemux( vlc_object_t *p_this )
473 demux_t *p_demux = (demux_t *)p_this;
476 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
477 free( p_demux->p_sys );
481 /*****************************************************************************
482 * Run: main SAP thread
483 *****************************************************************************
484 * Listens to SAP packets, and sends them to packet_handle
485 *****************************************************************************/
486 #define MAX_SAP_BUFFER 5000
488 static void *Run( void *data )
490 services_discovery_t *p_sd = data;
494 int canc = vlc_savecancel ();
496 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
497 * DNS queries, even if the DNS server returns an error with milliseconds.
498 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
499 * Winsock 1.1 from Windows 95, if not Windows 3.1.
500 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
501 * we have to open sockets in Run() rather than Open(). */
502 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
504 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
505 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
506 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
507 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
509 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
511 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
514 struct if_nameindex *l = if_nameindex ();
517 char *ptr = strchr (psz_address, '%') + 1;
518 for (unsigned i = 0; l[i].if_index; i++)
520 strcpy (ptr, l[i].if_name);
521 InitSocket (p_sd, psz_address, SAP_PORT);
523 if_freenameindex (l);
526 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
527 which if_nameindex uses internally anyway */
529 // first create a dummy socket to pin down the protocol family
530 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
531 if( s != INVALID_SOCKET )
533 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
534 size_t len = sizeof(ifaces);
536 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
538 unsigned ifcount = len/sizeof(INTERFACE_INFO);
539 char *ptr = strchr (psz_address, '%') + 1;
540 for(unsigned i = 1; i<=ifcount; ++i )
542 // append link-local zone identifier
543 sprintf(ptr, "%d", i);
549 *strchr (psz_address, '%') = '\0';
551 static const char ipv6_scopes[] = "1456789ABCDE";
552 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
554 psz_address[3] = *c_scope;
555 InitSocket( p_sd, psz_address, SAP_PORT );
559 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
560 if( psz_addr && *psz_addr )
561 InitSocket( p_sd, psz_addr, SAP_PORT );
564 if( p_sd->p_sys->i_fd == 0 )
566 msg_Err( p_sd, "unable to listen on any address" );
570 /* read SAP packets */
573 vlc_restorecancel (canc);
574 unsigned n = p_sd->p_sys->i_fd;
575 struct pollfd ufd[n];
577 for (unsigned i = 0; i < n; i++)
579 ufd[i].fd = p_sd->p_sys->pi_fd[i];
580 ufd[i].events = POLLIN;
584 int val = poll (ufd, n, timeout);
585 canc = vlc_savecancel ();
588 for (unsigned i = 0; i < n; i++)
592 uint8_t p_buffer[MAX_SAP_BUFFER+1];
595 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
596 MAX_SAP_BUFFER, false);
598 msg_Warn (p_sd, "receive error: %m");
601 /* Parse the packet */
602 p_buffer[i_read] = '\0';
603 ParseSAP (p_sd, p_buffer, i_read);
609 mtime_t now = mdate();
611 /* A 1 hour timeout correspong to the RFC Implicit timeout.
612 * This timeout is tuned in the following loop. */
613 timeout = 1000 * 60 * 60;
615 /* Check for items that need deletion */
616 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
618 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
619 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
620 mtime_t i_last_period = now - p_announce->i_last;
622 /* Remove the annoucement, if the last announcement was 1 hour ago
623 * or if the last packet emitted was 3 times the average time
624 * between two packets */
625 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
626 i_last_period > i_timeout )
628 RemoveAnnounce( p_sd, p_announce );
632 /* Compute next timeout */
633 if( p_announce->i_period_trust > 5 )
634 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
635 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
639 if( !p_sd->p_sys->i_announces )
640 timeout = -1; /* We can safely poll indefinitly. */
641 else if( timeout < 200 )
642 timeout = 200; /* Don't wakeup too fast. */
647 /**********************************************************************
648 * Demux: reads and demuxes data packets
649 * Return -1 if error, 0 if EOF, 1 else
650 **********************************************************************/
651 static int Demux( demux_t *p_demux )
653 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
654 input_thread_t *p_input;
655 input_item_t *p_parent_input;
657 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
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 );
673 vlc_mutex_lock( &p_parent_input->lock );
675 p_parent_input->i_type = ITEM_TYPE_NET;
677 vlc_mutex_unlock( &p_parent_input->lock );
681 static int Control( demux_t *p_demux, int i_query, va_list args )
683 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
687 /**************************************************************
689 **************************************************************/
691 /* i_read is at least > 6 */
692 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
697 const uint8_t *end = buf + len;
700 assert (buf[len] == '\0');
705 uint8_t flags = buf[0];
707 /* First, check the sap announce is correct */
708 if ((flags >> 5) != 1)
711 bool b_ipv6 = (flags & 0x10) != 0;
712 bool b_need_delete = (flags & 0x04) != 0;
716 msg_Dbg( p_sd, "encrypted packet, unsupported" );
720 bool b_compressed = (flags & 0x01) != 0;
722 uint16_t i_hash = U16_AT (buf + 2);
724 if( p_sd->p_sys->b_strict && i_hash == 0 )
726 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
730 // Skips source address and auth data
731 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
735 uint8_t *decomp = NULL;
738 int newsize = Decompress (buf, &decomp, end - buf);
741 msg_Dbg( p_sd, "decompression of SAP packet failed" );
745 decomp = realloc (decomp, newsize + 1);
746 decomp[newsize] = '\0';
747 psz_sdp = (const char *)decomp;
752 psz_sdp = (const char *)buf;
756 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
757 assert( psz_sdp[len] == '\0');
759 /* Skip payload type */
760 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
761 if (strncmp (psz_sdp, "v=0", 3))
763 size_t clen = strlen (psz_sdp) + 1;
765 if (strcmp (psz_sdp, "application/sdp"))
767 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
771 // skips content type
780 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
785 p_sdp->psz_sdp = psz_sdp;
787 /* Decide whether we should add a playlist item for this SDP */
788 /* Parse connection information (c= & m= ) */
789 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
790 p_sdp->psz_uri = NULL;
792 /* Multi-media or no-parse -> pass to LIVE.COM */
793 if( ( p_sdp->i_media_type != 14
794 && p_sdp->i_media_type != 32
795 && p_sdp->i_media_type != 33)
796 || p_sd->p_sys->b_parse == false )
798 free( p_sdp->psz_uri );
799 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
800 p_sdp->psz_uri = NULL;
803 if( p_sdp->psz_uri == NULL )
809 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
811 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
813 /* FIXME: we create a new announce each time the sdp changes */
814 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
816 /* We don't support delete announcement as they can easily
817 * Be used to highjack an announcement by a third party.
818 * Intead we cleverly implement Implicit Announcement removal.
820 * if( b_need_delete )
821 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
827 /* No need to go after six, as we start to trust the
828 * average period at six */
829 if( p_announce->i_period_trust <= 5 )
830 p_announce->i_period_trust++;
832 /* Compute the average period */
833 mtime_t now = mdate();
834 p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
835 p_announce->i_last = now;
837 FreeSDP( p_sdp ); p_sdp = NULL;
842 CreateAnnounce( p_sd, i_hash, p_sdp );
848 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
851 input_item_t *p_input;
852 const char *psz_value;
853 sap_announce_t *p_sap = (sap_announce_t *)malloc(
854 sizeof(sap_announce_t ) );
855 services_discovery_sys_t *p_sys;
861 p_sap->i_last = mdate();
863 p_sap->i_period_trust = 0;
864 p_sap->i_hash = i_hash;
865 p_sap->p_sdp = p_sdp;
867 /* Released in RemoveAnnounce */
868 p_input = input_item_NewWithType( VLC_OBJECT(p_sd),
869 p_sap->p_sdp->psz_uri,
870 p_sdp->psz_sessionname,
871 0, NULL, -1, ITEM_TYPE_NET );
872 p_sap->p_item = p_input;
879 if( p_sys->b_timeshift )
880 input_item_AddOption( p_input, ":access-filter=timeshift" );
882 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
883 if( psz_value != NULL )
885 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
887 if( strcmp( p_sdp->username, "-" ) )
889 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
894 if (p_sap->p_sdp->mediac >= 1)
895 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
897 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
899 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
901 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
907 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
910 /* Look for media attribute, and fallback to session */
911 return GetAttribute (sdp->mediav[media].pp_attributes,
912 sdp->mediav[media].i_attributes, name)
913 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
917 /* Fill p_sdp->psz_uri */
918 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
920 if (p_sdp->mediac == 0)
922 msg_Dbg (p_obj, "Ignoring SDP with no media");
926 for (unsigned i = 1; i < p_sdp->mediac; i++)
928 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
929 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
930 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
931 p_sdp->mediav->addrlen))
933 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
938 if (p_sdp->mediav->n_addr != 1)
940 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
949 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
950 p_sdp->mediav->addrlen, psz_uri + 1,
951 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
954 if (strchr (psz_uri + 1, ':'))
957 strcat (psz_uri, "]");
963 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
964 if (sdp_proto == NULL)
967 char *subtype = strchr (sdp_proto, ' ');
970 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
977 /* FIXME: check for multiple payload types in RTP/AVP case.
978 * FIXME: check for "mpeg" subtype in raw udp case. */
979 if (!strcasecmp (sdp_proto, "udp"))
980 p_sdp->i_media_type = 33;
982 p_sdp->i_media_type = atoi (subtype);
985 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
986 * 0x1: Connection-Oriented media. */
987 static const char proto_match[] =
989 "RTP/AVP\0" "rtp\0\0"
990 "UDPLite/RTP/AVP\0" "udplite\0\0"
991 "DCCP/RTP/AVP\0" "dccp\0\1"
992 "TCP/RTP/AVP\0" "rtptcp\0\1"
995 const char *vlc_proto = NULL;
997 for (const char *proto = proto_match; *proto;)
999 if (strcasecmp (proto, sdp_proto) == 0)
1001 vlc_proto = proto + strlen (proto) + 1;
1002 flags = vlc_proto[strlen (vlc_proto) + 1];
1005 proto += strlen (proto) + 1;
1006 proto += strlen (proto) + 2;
1010 if (vlc_proto == NULL)
1012 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1013 p_sdp->mediav[0].fmt);
1014 return VLC_EGENERIC;
1019 /* Connection-oriented media */
1020 const char *setup = FindAttribute (p_sdp, 0, "setup");
1022 setup = "active"; /* default value */
1024 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1026 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1027 return VLC_EGENERIC;
1030 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1036 /* Non-connected (normally multicast) media */
1038 char psz_source[258] = "";
1039 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1040 if (sfilter != NULL)
1042 char psz_source_ip[256];
1045 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1046 psz_source_ip) == 2)
1048 /* According to RFC4570, FQDNs can be used for source-filters,
1049 * but -seriously- this is impractical */
1055 struct in6_addr addr;
1056 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1057 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1058 sizeof (psz_source) - 2) != NULL))
1060 psz_source[0] = '[';
1061 psz_source[strlen (psz_source)] = ']';
1068 struct in_addr addr;
1069 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1070 && (inet_ntop (AF_INET, &addr, psz_source,
1071 sizeof (psz_source)) == NULL))
1079 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1088 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1089 socklen_t *addrlen, unsigned *number)
1092 unsigned fam, n1, n2;
1094 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1102 addr->ss_family = AF_INET6;
1106 *addrlen = sizeof (struct sockaddr_in6);
1108 if (inet_pton (AF_INET6, host,
1109 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1112 *number = (res >= 3) ? n1 : 1;
1117 addr->ss_family = AF_INET;
1121 *addrlen = sizeof (struct sockaddr_in);
1123 if (inet_pton (AF_INET, host,
1124 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1127 *number = (res >= 4) ? n2 : 1;
1137 /***********************************************************************
1138 * ParseSDP : SDP parsing
1139 * *********************************************************************
1140 * Validate SDP and parse all fields
1141 ***********************************************************************/
1142 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1144 if( psz_sdp == NULL )
1147 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1152 struct sockaddr_storage glob_addr;
1153 memset (&glob_addr, 0, sizeof (glob_addr));
1154 socklen_t glob_len = 0;
1155 unsigned glob_count = 1;
1158 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1161 /* Extract one line */
1162 char *eol = strchr (psz_sdp, '\n');
1163 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1164 char line[linelen + 1];
1165 memcpy (line, psz_sdp, linelen);
1166 line[linelen] = '\0';
1168 psz_sdp += linelen + 1;
1170 /* Remove carriage return if present */
1171 eol = strchr (line, '\r');
1174 linelen = eol - line;
1175 line[linelen] = '\0';
1179 char cat = line[0], *data = line + 2;
1180 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1182 /* MUST ignore SDP with unknown line type */
1183 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1188 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1192 assert (linelen >= 2);
1194 /* SDP parsing state machine
1195 * We INTERNALLY use uppercase for session, lowercase for media
1199 /* Session description */
1204 msg_Dbg (p_obj, "missing SDP version");
1207 if (strcmp (data, "0"))
1209 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1219 msg_Dbg (p_obj, "missing SDP originator");
1223 if ((sscanf (data, "%63s %"PRIu64" %"PRIu64" IN IP%u %1023s",
1224 p_sdp->username, &p_sdp->session_id,
1225 &p_sdp->session_version, &p_sdp->orig_ip_version,
1226 p_sdp->orig_host) != 5)
1227 || ((p_sdp->orig_ip_version != 4)
1228 && (p_sdp->orig_ip_version != 6)))
1230 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1231 /* Or maybe out-of-range, but this looks suspicious */
1234 EnsureUTF8 (p_sdp->orig_host);
1241 if ((cat != 's') || !*data)
1243 /* MUST be present AND non-empty */
1244 msg_Dbg (p_obj, "missing SDP session name");
1247 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1248 p_sdp->psz_sessionname = strdup (data);
1249 if (p_sdp->psz_sessionname == NULL)
1251 EnsureUTF8 (p_sdp->psz_sessionname);
1275 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1278 msg_Dbg (p_obj, "SDP connection infos not supported: "
1285 assert (expect == 'B');
1292 msg_Dbg (p_obj, "missing SDP time description");
1298 if ((cat == 't') || (cat == 'r'))
1313 attribute_t *p_attr = MakeAttribute (data);
1314 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1318 /* Media description */
1325 msg_Dbg (p_obj, "missing SDP media description");
1328 struct sdp_media_t *m;
1329 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1337 memset (m, 0, sizeof (*m));
1338 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1339 m->n_addr = glob_count;
1341 /* TODO: remember media type (if we need multiple medias) */
1342 data = strchr (data, ' ');
1345 msg_Dbg (p_obj, "missing SDP media port");
1348 port = atoi (++data);
1349 if (port <= 0 || port >= 65536)
1351 msg_Dbg (p_obj, "invalid transport port %d", port);
1354 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1356 data = strchr (data, ' ');
1359 msg_Dbg (p_obj, "missing SDP media format");
1362 m->fmt = strdup (++data);
1376 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1377 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1380 msg_Dbg (p_obj, "SDP connection infos not supported: "
1384 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1396 assert (expect == 'a');
1399 attribute_t *p_attr = MakeAttribute (data);
1403 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1404 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1413 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1419 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1431 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1434 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1436 return VLC_EGENERIC;
1438 shutdown( i_fd, SHUT_WR );
1439 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1440 p_sd->p_sys->i_fd, i_fd);
1444 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1447 int i_result, i_dstsize, n = 0;
1448 unsigned char *psz_dst = NULL;
1451 memset (&d_stream, 0, sizeof (d_stream));
1453 i_result = inflateInit(&d_stream);
1454 if( i_result != Z_OK )
1457 d_stream.next_in = (Bytef *)psz_src;
1458 d_stream.avail_in = i_len;
1463 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1464 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1465 d_stream.avail_out = 1000;
1467 i_result = inflate(&d_stream, Z_NO_FLUSH);
1468 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1470 inflateEnd( &d_stream );
1474 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1475 ( i_result != Z_STREAM_END ) );
1477 i_dstsize = d_stream.total_out;
1478 inflateEnd( &d_stream );
1480 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1492 static void FreeSDP( sdp_t *p_sdp )
1494 free( p_sdp->psz_sessionname );
1495 free( p_sdp->psz_uri );
1497 for (unsigned j = 0; j < p_sdp->mediac; j++)
1499 free (p_sdp->mediav[j].fmt);
1500 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1501 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1502 free (p_sdp->mediav[j].pp_attributes);
1504 free (p_sdp->mediav);
1506 for (int i = 0; i < p_sdp->i_attributes; i++)
1507 FreeAttribute (p_sdp->pp_attributes[i]);
1509 free (p_sdp->pp_attributes);
1513 static int RemoveAnnounce( services_discovery_t *p_sd,
1514 sap_announce_t *p_announce )
1518 if( p_announce->p_sdp )
1520 FreeSDP( p_announce->p_sdp );
1521 p_announce->p_sdp = NULL;
1524 if( p_announce->p_item )
1526 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1527 vlc_gc_decref( p_announce->p_item );
1528 p_announce->p_item = NULL;
1531 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1533 if( p_sd->p_sys->pp_announces[i] == p_announce )
1535 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1546 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1548 /* A session is identified by
1551 * - network type (which is always IN),
1552 * - address type (currently, this means IP version),
1555 if (strcmp (p_sdp1->username, p_sdp2->username)
1556 || (p_sdp1->session_id != p_sdp2->session_id)
1557 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1558 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1565 static inline attribute_t *MakeAttribute (const char *str)
1567 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1571 strcpy (a->name, str);
1572 EnsureUTF8 (a->name);
1573 char *value = strchr (a->name, ':');
1585 static const char *GetAttribute (attribute_t **tab, unsigned n,
1588 for (unsigned i = 0; i < n; i++)
1589 if (strcasecmp (tab[i]->name, name) == 0)
1590 return tab[i]->value;
1595 static inline void FreeAttribute (attribute_t *a)