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
235 /* Socket descriptors */
239 /* Table of announces */
241 struct sap_announce_t **pp_announces;
256 /*****************************************************************************
258 *****************************************************************************/
262 static int Demux( demux_t *p_demux );
263 static int Control( demux_t *, int, va_list );
264 static void Run ( services_discovery_t *p_sd );
266 /* Main parsing functions */
267 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
268 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
269 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
270 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
271 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
273 /* Helper functions */
274 static inline attribute_t *MakeAttribute (const char *str);
275 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
276 static inline void FreeAttribute (attribute_t *a);
277 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
280 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
281 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
282 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
283 static void FreeSDP( sdp_t *p_sdp );
285 static inline int min_int( int a, int b )
287 return a > b ? b : a;
290 /*****************************************************************************
291 * Open: initialize and create stuff
292 *****************************************************************************/
293 static int Open( vlc_object_t *p_this )
295 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
296 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
297 malloc( sizeof( services_discovery_sys_t ) );
301 p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
309 p_sys->b_strict = var_CreateGetInteger( p_sd, "sap-strict");
310 p_sys->b_parse = var_CreateGetInteger( p_sd, "sap-parse" );
313 if( var_CreateGetInteger( p_sd, "sap-cache" ) )
319 /* Cache sap_timeshift value */
320 p_sys->b_timeshift = var_CreateGetInteger( p_sd, "sap-timeshift" );
323 services_discovery_SetLocalizedName( p_sd, _("SAP") );
325 p_sys->i_announces = 0;
326 p_sys->pp_announces = NULL;
331 /*****************************************************************************
332 * OpenDemux: initialize and create stuff
333 *****************************************************************************/
334 static int OpenDemux( vlc_object_t *p_this )
336 demux_t *p_demux = (demux_t *)p_this;
337 const uint8_t *p_peek;
338 char *psz_sdp = NULL;
340 int errval = VLC_EGENERIC;
343 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
345 /* We want livedotcom module to parse this SDP file */
349 assert( p_demux->s ); /* this is NOT an access_demux */
352 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
355 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
358 /* Gather the complete sdp file */
359 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
361 const int i_read_max = 1024;
362 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
364 if( psz_sdp_new == NULL )
369 psz_sdp = psz_sdp_new;
371 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
372 if( (int)i_read < 0 )
374 msg_Err( p_demux, "cannot read SDP" );
379 psz_sdp[i_len] = '\0';
381 if( (int)i_read < i_read_max )
385 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
389 msg_Warn( p_demux, "invalid SDP");
393 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
395 p_sdp->psz_uri = NULL;
397 switch (p_sdp->i_media_type)
398 { /* Should be in sync with modules/demux/rtp.c */
399 case 0: /* PCMU/8000 */
400 case 8: /* PCMA/8000 */
401 case 10: /* L16/44100/2 */
402 case 11: /* L16/44100 */
403 case 14: /* MPA/90000 */
404 case 32: /* MPV/90000 */
405 case 33: /* MP2/90000 */
410 if( p_sdp->psz_uri == NULL ) goto error;
412 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
413 p_demux->p_sys->p_sdp = p_sdp;
414 p_demux->pf_control = Control;
415 p_demux->pf_demux = Demux;
422 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
423 stream_Seek( p_demux->s, 0 );
427 /*****************************************************************************
429 *****************************************************************************/
430 static void Close( vlc_object_t *p_this )
432 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
433 services_discovery_sys_t *p_sys = p_sd->p_sys;
437 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
439 net_Close( p_sys->pi_fd[i] );
441 FREENULL( p_sys->pi_fd );
444 if( config_GetInt( p_sd, "sap-cache" ) )
450 for( i = p_sys->i_announces - 1; i>= 0; i-- )
452 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
454 FREENULL( p_sys->pp_announces );
459 /*****************************************************************************
460 * CloseDemux: Close the demuxer
461 *****************************************************************************/
462 static void CloseDemux( vlc_object_t *p_this )
464 demux_t *p_demux = (demux_t *)p_this;
467 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
468 free( p_demux->p_sys );
472 /*****************************************************************************
473 * Run: main SAP thread
474 *****************************************************************************
475 * Listens to SAP packets, and sends them to packet_handle
476 *****************************************************************************/
477 #define MAX_SAP_BUFFER 5000
479 static void Run( services_discovery_t *p_sd )
485 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
486 * DNS queries, even if the DNS server returns an error with milliseconds.
487 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
488 * Winsock 1.1 from Windows 95, if not Windows 3.1.
489 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
490 * we have to open sockets in Run() rather than Open(). */
491 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
493 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
494 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
495 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
496 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
498 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
500 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
503 struct if_nameindex *l = if_nameindex ();
506 char *ptr = strchr (psz_address, '%') + 1;
507 for (unsigned i = 0; l[i].if_index; i++)
509 strcpy (ptr, l[i].if_name);
510 InitSocket (p_sd, psz_address, SAP_PORT);
512 if_freenameindex (l);
515 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
516 which if_nameindex uses internally anyway */
518 // first create a dummy socket to pin down the protocol family
519 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
520 if( s != INVALID_SOCKET )
522 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
523 size_t len = sizeof(ifaces);
525 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
527 unsigned ifcount = len/sizeof(INTERFACE_INFO);
528 char *ptr = strchr (psz_address, '%') + 1;
529 for(unsigned i = 1; i<=ifcount; ++i )
531 // append link-local zone identifier
532 sprintf(ptr, "%d", i);
538 *strchr (psz_address, '%') = '\0';
540 static const char ipv6_scopes[] = "1456789ABCDE";
541 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
543 psz_address[3] = *c_scope;
544 InitSocket( p_sd, psz_address, SAP_PORT );
548 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
549 if( psz_addr && *psz_addr )
551 InitSocket( p_sd, psz_addr, SAP_PORT );
555 if( p_sd->p_sys->i_fd == 0 )
557 msg_Err( p_sd, "unable to listen on any address" );
561 vlc_object_lock( p_sd );
563 /* read SAP packets */
564 while( vlc_object_alive( p_sd ) )
566 unsigned n = p_sd->p_sys->i_fd;
567 struct pollfd ufd[n+1];
569 for (unsigned i = 0; i < n; i++)
571 ufd[i].fd = p_sd->p_sys->pi_fd[i];
572 ufd[i].events = POLLIN;
576 /* Make sure we track vlc_object_signal() */
577 ufd[n].fd = vlc_object_waitpipe( p_sd );
578 ufd[n].events = POLLIN | POLLHUP;
581 if( ufd[n].fd == -1 )
583 /* On windows, fd will be -1, as we can't select on a pipe()-ed
584 * fildes. Because we have no other solution to track that
585 * object is killed, we make sure the timeout won't be to long. */
586 if( timeout > 1000 || timeout == -1 )
590 vlc_object_unlock( p_sd );
592 if (poll (ufd, n+1, timeout) > 0)
594 for (unsigned i = 0; i < n; i++)
598 uint8_t p_buffer[MAX_SAP_BUFFER+1];
601 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
602 MAX_SAP_BUFFER, false);
604 msg_Warn (p_sd, "receive error: %m");
607 /* Parse the packet */
608 p_buffer[i_read] = '\0';
609 ParseSAP (p_sd, p_buffer, i_read);
615 mtime_t now = mdate();
617 /* A 1 hour timeout correspong to the RFC Implicit timeout.
618 * This timeout is tuned in the following loop. */
619 timeout = 1000 * 60 * 60;
621 /* Check for items that need deletion */
622 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
624 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
625 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
626 mtime_t i_last_period = now - p_announce->i_last;
628 /* Remove the annoucement, if the last announcement was 1 hour ago
629 * or if the last packet emitted was 3 times the average time
630 * between two packets */
631 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
632 i_last_period > i_timeout )
634 RemoveAnnounce( p_sd, p_announce );
638 /* Compute next timeout */
639 if( p_announce->i_period_trust > 5 )
640 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
641 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
645 if( !p_sd->p_sys->i_announces )
646 timeout = -1; /* We can safely poll indefinitly. */
647 else if( timeout < 200 )
648 timeout = 200; /* Don't wakeup too fast. */
650 vlc_object_lock( p_sd );
652 vlc_object_unlock( p_sd );
655 /**********************************************************************
656 * Demux: reads and demuxes data packets
657 * Return -1 if error, 0 if EOF, 1 else
658 **********************************************************************/
659 static int Demux( demux_t *p_demux )
661 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
662 input_thread_t *p_input;
663 input_item_t *p_parent_input;
665 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
670 msg_Err( p_demux, "parent input could not be found" );
674 /* This item hasn't been yield by input_GetItem
675 * don't release it */
676 p_parent_input = input_GetItem( p_input );
678 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
679 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
681 vlc_mutex_lock( &p_parent_input->lock );
683 p_parent_input->i_type = ITEM_TYPE_NET;
685 vlc_mutex_unlock( &p_parent_input->lock );
689 static int Control( demux_t *p_demux, int i_query, va_list args )
691 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
695 /**************************************************************
697 **************************************************************/
699 /* i_read is at least > 6 */
700 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
705 const uint8_t *end = buf + len;
708 assert (buf[len] == '\0');
713 uint8_t flags = buf[0];
715 /* First, check the sap announce is correct */
716 if ((flags >> 5) != 1)
719 bool b_ipv6 = (flags & 0x10) != 0;
720 bool b_need_delete = (flags & 0x04) != 0;
724 msg_Dbg( p_sd, "encrypted packet, unsupported" );
728 bool b_compressed = (flags & 0x01) != 0;
730 uint16_t i_hash = U16_AT (buf + 2);
732 if( p_sd->p_sys->b_strict && i_hash == 0 )
734 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
738 // Skips source address and auth data
739 buf += 4 + (b_ipv6 ? 16 : 4) + buf[1];
743 uint8_t *decomp = NULL;
746 int newsize = Decompress (buf, &decomp, end - buf);
749 msg_Dbg( p_sd, "decompression of SAP packet failed" );
753 decomp = realloc (decomp, newsize + 1);
754 decomp[newsize] = '\0';
755 psz_sdp = (const char *)decomp;
760 psz_sdp = (const char *)buf;
764 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
765 assert( psz_sdp[len] == '\0');
767 /* Skip payload type */
768 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
769 if (strncmp (psz_sdp, "v=0", 3))
771 size_t clen = strlen (psz_sdp) + 1;
773 if (strcmp (psz_sdp, "application/sdp"))
775 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
779 // skips content type
788 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
793 p_sdp->psz_sdp = psz_sdp;
795 /* Decide whether we should add a playlist item for this SDP */
796 /* Parse connection information (c= & m= ) */
797 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
798 p_sdp->psz_uri = NULL;
800 /* Multi-media or no-parse -> pass to LIVE.COM */
801 if( ( p_sdp->i_media_type != 14
802 && p_sdp->i_media_type != 32
803 && p_sdp->i_media_type != 33)
804 || p_sd->p_sys->b_parse == false )
806 free( p_sdp->psz_uri );
807 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
808 p_sdp->psz_uri = NULL;
811 if( p_sdp->psz_uri == NULL )
817 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
819 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
821 /* FIXME: we create a new announce each time the sdp changes */
822 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
824 /* We don't support delete announcement as they can easily
825 * Be used to highjack an announcement by a third party.
826 * Intead we cleverly implement Implicit Announcement removal.
828 * if( b_need_delete )
829 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
835 /* No need to go after six, as we start to trust the
836 * average period at six */
837 if( p_announce->i_period_trust <= 5 )
838 p_announce->i_period_trust++;
840 /* Compute the average period */
841 p_announce->i_period = (p_announce->i_period + (mdate() - p_announce->i_last)) / 2;
842 p_announce->i_last = mdate();
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_ItemNewWithType( VLC_OBJECT(p_sd),
876 p_sap->p_sdp->psz_uri,
877 p_sdp->psz_sessionname,
878 0, NULL, -1, ITEM_TYPE_NET );
879 p_sap->p_item = p_input;
886 if( p_sys->b_timeshift )
887 input_ItemAddOption( p_input, ":access-filter=timeshift" );
889 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
890 if( psz_value != NULL )
892 input_ItemAddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
894 if( strcmp( p_sdp->username, "-" ) )
896 input_ItemAddInfo( p_input, _("Session"), _("User"), "%s",
901 if (p_sap->p_sdp->mediac >= 1)
902 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
904 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
906 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
908 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
914 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
917 /* Look for media attribute, and fallback to session */
918 return GetAttribute (sdp->mediav[media].pp_attributes,
919 sdp->mediav[media].i_attributes, name)
920 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
924 /* Fill p_sdp->psz_uri */
925 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
927 if (p_sdp->mediac == 0)
929 msg_Dbg (p_obj, "Ignoring SDP with no media");
933 for (unsigned i = 1; i < p_sdp->mediac; i++)
935 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
936 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
937 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
938 p_sdp->mediav->addrlen))
940 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
945 if (p_sdp->mediav->n_addr != 1)
947 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
956 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
957 p_sdp->mediav->addrlen, psz_uri + 1,
958 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
961 if (strchr (psz_uri + 1, ':'))
964 strcat (psz_uri, "]");
970 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
971 if (sdp_proto == NULL)
974 char *subtype = strchr (sdp_proto, ' ');
977 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
984 /* FIXME: check for multiple payload types in RTP/AVP case.
985 * FIXME: check for "mpeg" subtype in raw udp case. */
986 if (!strcasecmp (sdp_proto, "udp"))
987 p_sdp->i_media_type = 33;
989 p_sdp->i_media_type = atoi (subtype);
992 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
993 * 0x1: Connection-Oriented media. */
994 static const char proto_match[] =
996 "RTP/AVP\0" "rtp\0\0"
997 "UDPLite/RTP/AVP\0" "udplite\0\0"
998 "DCCP/RTP/AVP\0" "dccp\0\1"
999 "TCP/RTP/AVP\0" "rtptcp\0\1"
1002 const char *vlc_proto = NULL;
1004 for (const char *proto = proto_match; *proto;)
1006 if (strcasecmp (proto, sdp_proto) == 0)
1008 vlc_proto = proto + strlen (proto) + 1;
1009 flags = vlc_proto[strlen (vlc_proto) + 1];
1012 proto += strlen (proto) + 1;
1013 proto += strlen (proto) + 2;
1017 if (vlc_proto == NULL)
1019 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1020 p_sdp->mediav[0].fmt);
1021 return VLC_EGENERIC;
1026 /* Connection-oriented media */
1027 const char *setup = FindAttribute (p_sdp, 0, "setup");
1029 setup = "active"; /* default value */
1031 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1033 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1034 return VLC_EGENERIC;
1037 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1043 /* Non-connected (normally multicast) media */
1045 char psz_source[258] = "";
1046 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1047 if (sfilter != NULL)
1049 char psz_source_ip[256];
1052 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1053 psz_source_ip) == 2)
1055 /* According to RFC4570, FQDNs can be used for source-filters,
1056 * but -seriously- this is impractical */
1062 struct in6_addr addr;
1063 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1064 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1065 sizeof (psz_source) - 2) != NULL))
1067 psz_source[0] = '[';
1068 psz_source[strlen (psz_source)] = ']';
1075 struct in_addr addr;
1076 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1077 && (inet_ntop (AF_INET, &addr, psz_source,
1078 sizeof (psz_source)) == NULL))
1086 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1095 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1096 socklen_t *addrlen, unsigned *number)
1099 unsigned fam, n1, n2;
1101 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1109 addr->ss_family = AF_INET6;
1113 *addrlen = sizeof (struct sockaddr_in6);
1115 if (inet_pton (AF_INET6, host,
1116 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1119 *number = (res >= 3) ? n1 : 1;
1124 addr->ss_family = AF_INET;
1128 *addrlen = sizeof (struct sockaddr_in);
1130 if (inet_pton (AF_INET, host,
1131 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1134 *number = (res >= 4) ? n2 : 1;
1144 /***********************************************************************
1145 * ParseSDP : SDP parsing
1146 * *********************************************************************
1147 * Validate SDP and parse all fields
1148 ***********************************************************************/
1149 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1151 if( psz_sdp == NULL )
1154 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1159 struct sockaddr_storage glob_addr;
1160 memset (&glob_addr, 0, sizeof (glob_addr));
1161 socklen_t glob_len = 0;
1162 unsigned glob_count = 1;
1165 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1168 /* Extract one line */
1169 char *eol = strchr (psz_sdp, '\n');
1170 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1171 char line[linelen + 1];
1172 memcpy (line, psz_sdp, linelen);
1173 line[linelen] = '\0';
1175 psz_sdp += linelen + 1;
1177 /* Remove carriage return if present */
1178 eol = strchr (line, '\r');
1181 linelen = eol - line;
1182 line[linelen] = '\0';
1186 char cat = line[0], *data = line + 2;
1187 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1189 /* MUST ignore SDP with unknown line type */
1190 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1195 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1199 assert (linelen >= 2);
1201 /* SDP parsing state machine
1202 * We INTERNALLY use uppercase for session, lowercase for media
1206 /* Session description */
1211 msg_Dbg (p_obj, "missing SDP version");
1214 if (strcmp (data, "0"))
1216 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1226 msg_Dbg (p_obj, "missing SDP originator");
1230 if ((sscanf (data, "%63s %"PRIu64" %"PRIu64" IN IP%u %1023s",
1231 p_sdp->username, &p_sdp->session_id,
1232 &p_sdp->session_version, &p_sdp->orig_ip_version,
1233 p_sdp->orig_host) != 5)
1234 || ((p_sdp->orig_ip_version != 4)
1235 && (p_sdp->orig_ip_version != 6)))
1237 msg_Dbg (p_obj, "SDP origin not supported: %s\n", data);
1238 /* Or maybe out-of-range, but this looks suspicious */
1241 EnsureUTF8 (p_sdp->orig_host);
1248 if ((cat != 's') || !*data)
1250 /* MUST be present AND non-empty */
1251 msg_Dbg (p_obj, "missing SDP session name");
1254 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1255 p_sdp->psz_sessionname = strdup (data);
1256 EnsureUTF8 (p_sdp->psz_sessionname);
1257 if (p_sdp->psz_sessionname == NULL)
1282 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1285 msg_Dbg (p_obj, "SDP connection infos not supported: "
1292 assert (expect == 'B');
1299 msg_Dbg (p_obj, "missing SDP time description");
1305 if ((cat == 't') || (cat == 'r'))
1320 attribute_t *p_attr = MakeAttribute (data);
1321 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1325 /* Media description */
1332 msg_Dbg (p_obj, "missing SDP media description");
1335 struct sdp_media_t *m;
1336 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1344 memset (m, 0, sizeof (*m));
1345 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1346 m->n_addr = glob_count;
1348 /* TODO: remember media type (if we need multiple medias) */
1349 data = strchr (data, ' ');
1352 msg_Dbg (p_obj, "missing SDP media port");
1355 port = atoi (++data);
1356 if (port <= 0 || port >= 65536)
1358 msg_Dbg (p_obj, "invalid transport port %d", port);
1361 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1363 data = strchr (data, ' ');
1366 msg_Dbg (p_obj, "missing SDP media format");
1369 m->fmt = strdup (++data);
1383 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1384 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1387 msg_Dbg (p_obj, "SDP connection infos not supported: "
1391 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1403 assert (expect == 'a');
1406 attribute_t *p_attr = MakeAttribute (data);
1410 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1411 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1420 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1426 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1438 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1441 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1443 return VLC_EGENERIC;
1445 shutdown( i_fd, SHUT_WR );
1446 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1447 p_sd->p_sys->i_fd, i_fd);
1451 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1454 int i_result, i_dstsize, n = 0;
1455 unsigned char *psz_dst = NULL;
1458 memset (&d_stream, 0, sizeof (d_stream));
1460 i_result = inflateInit(&d_stream);
1461 if( i_result != Z_OK )
1464 d_stream.next_in = (Bytef *)psz_src;
1465 d_stream.avail_in = i_len;
1470 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1471 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1472 d_stream.avail_out = 1000;
1474 i_result = inflate(&d_stream, Z_NO_FLUSH);
1475 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1477 inflateEnd( &d_stream );
1481 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1482 ( i_result != Z_STREAM_END ) );
1484 i_dstsize = d_stream.total_out;
1485 inflateEnd( &d_stream );
1487 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1499 static void FreeSDP( sdp_t *p_sdp )
1501 free( p_sdp->psz_sessionname );
1502 free( p_sdp->psz_uri );
1504 for (unsigned j = 0; j < p_sdp->mediac; j++)
1506 free (p_sdp->mediav[j].fmt);
1507 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1508 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1509 free (p_sdp->mediav[j].pp_attributes);
1511 free (p_sdp->mediav);
1513 for (int i = 0; i < p_sdp->i_attributes; i++)
1514 FreeAttribute (p_sdp->pp_attributes[i]);
1516 free (p_sdp->pp_attributes);
1520 static int RemoveAnnounce( services_discovery_t *p_sd,
1521 sap_announce_t *p_announce )
1525 if( p_announce->p_sdp )
1527 FreeSDP( p_announce->p_sdp );
1528 p_announce->p_sdp = NULL;
1531 if( p_announce->p_item )
1533 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1534 vlc_gc_decref( p_announce->p_item );
1535 p_announce->p_item = NULL;
1538 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1540 if( p_sd->p_sys->pp_announces[i] == p_announce )
1542 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1553 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1555 /* A session is identified by
1558 * - network type (which is always IN),
1559 * - address type (currently, this means IP version),
1562 if (strcmp (p_sdp1->username, p_sdp2->username)
1563 || (p_sdp1->session_id != p_sdp2->session_id)
1564 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1565 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1572 static inline attribute_t *MakeAttribute (const char *str)
1574 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1578 strcpy (a->name, str);
1579 EnsureUTF8 (a->name);
1580 char *value = strchr (a->name, ':');
1592 static const char *GetAttribute (attribute_t **tab, unsigned n,
1595 for (unsigned i = 0; i < n; i++)
1596 if (strcasecmp (tab[i]->name, name) == 0)
1597 return tab[i]->value;
1602 static inline void FreeAttribute (attribute_t *a)