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 *****************************************************************************/
32 #include <vlc_playlist.h>
33 #include <vlc_demux.h>
35 #include <vlc_network.h>
36 #include <vlc_charset.h>
44 #ifdef HAVE_SYS_TIME_H
45 # include <sys/time.h>
59 /************************************************************************
60 * Macros and definitions
61 ************************************************************************/
63 #define MAX_LINE_LENGTH 256
65 /* SAP is always on that port */
67 /* Global-scope SAP address */
68 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
69 /* Organization-local SAP address */
70 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
71 /* Local (smallest non-link-local scope) SAP address */
72 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
73 /* Link-local SAP address */
74 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
77 /*****************************************************************************
79 *****************************************************************************/
80 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
81 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
82 "right addresses to listen to. However, you " \
83 "can specify a specific address." )
84 #define SAP_IPV4_TEXT N_( "IPv4 SAP" )
85 #define SAP_IPV4_LONGTEXT N_( \
86 "Listen to IPv4 announcements on the standard addresses." )
87 #define SAP_IPV6_TEXT N_( "IPv6 SAP" )
88 #define SAP_IPV6_LONGTEXT N_( \
89 "Listen to IPv6 announcements on the standard addresses." )
90 #define SAP_SCOPE_TEXT N_( "IPv6 SAP scope" )
91 #define SAP_SCOPE_LONGTEXT N_( \
92 "Scope for IPv6 announcements (default is 8)." )
93 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
94 #define SAP_TIMEOUT_LONGTEXT N_( \
95 "Delay after which SAP items get deleted if no new announcement " \
97 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
98 #define SAP_PARSE_LONGTEXT N_( \
99 "This enables actual parsing of the announces by the SAP module. " \
100 "Otherwise, all announcements are parsed by the \"livedotcom\" " \
101 "(RTP/RTSP) module." )
102 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
103 #define SAP_STRICT_LONGTEXT N_( \
104 "When this is set, the SAP parser will discard some non-compliant " \
106 #define SAP_CACHE_TEXT N_("Use SAP cache")
107 #define SAP_CACHE_LONGTEXT N_( \
108 "This enables a SAP caching mechanism. " \
109 "This will result in lower SAP startup time, but you could end up " \
110 "with items corresponding to legacy streams." )
111 #define SAP_TIMESHIFT_TEXT N_("Allow timeshifting")
112 #define SAP_TIMESHIFT_LONGTEXT N_( "This automatically enables timeshifting " \
113 "for streams discovered through SAP announcements." )
116 static int Open ( vlc_object_t * );
117 static void Close( vlc_object_t * );
118 static int OpenDemux ( vlc_object_t * );
119 static void CloseDemux ( vlc_object_t * );
122 set_shortname( _("SAP"));
123 set_description( _("SAP Announcements") );
124 set_category( CAT_PLAYLIST );
125 set_subcategory( SUBCAT_PLAYLIST_SD );
127 add_string( "sap-addr", NULL, NULL,
128 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, VLC_TRUE );
130 add_bool( "sap-ipv4", 1 , NULL,
131 SAP_IPV4_TEXT,SAP_IPV4_LONGTEXT, VLC_TRUE );
133 add_bool( "sap-ipv6", 1 , NULL,
134 SAP_IPV6_TEXT, SAP_IPV6_LONGTEXT, VLC_TRUE );
136 add_integer( "sap-timeout", 1800, NULL,
137 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, VLC_TRUE );
139 add_bool( "sap-parse", 1 , NULL,
140 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, VLC_TRUE );
142 add_bool( "sap-strict", 0 , NULL,
143 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, VLC_TRUE );
146 add_bool( "sap-cache", 0 , NULL,
147 SAP_CACHE_TEXT,SAP_CACHE_LONGTEXT, VLC_TRUE );
150 add_bool( "sap-timeshift", 0 , NULL,
151 SAP_TIMESHIFT_TEXT,SAP_TIMESHIFT_LONGTEXT, VLC_TRUE );
154 set_capability( "services_discovery", 0 );
155 set_callbacks( Open, Close );
158 set_description( _("SDP Descriptions parser") );
159 add_shortcut( "sdp" );
160 set_capability( "demux2", 51 );
161 set_callbacks( OpenDemux, CloseDemux );
165 /*****************************************************************************
167 *****************************************************************************/
169 typedef struct sdp_t sdp_t;
170 typedef struct attribute_t attribute_t;
171 typedef struct sap_announce_t sap_announce_t;
176 struct sdp_t *parent;
178 struct sockaddr_storage addr;
182 attribute_t **pp_attributes;
186 /* The structure that contains sdp information */
194 uint64_t session_version;
195 unsigned orig_ip_version;
196 char orig_host[1024];
199 char *psz_sessionname;
206 /* a= global attributes */
208 attribute_t **pp_attributes;
210 /* medias (well, we only support one atm) */
212 struct sdp_media_t *mediav;
221 struct sap_announce_t
225 uint8_t i_period_trust;
228 uint32_t i_source[4];
230 /* SAP annnounces must only contain one SDP */
236 struct services_discovery_sys_t
238 /* Socket descriptors */
242 /* Table of announces */
244 struct sap_announce_t **pp_announces;
249 vlc_bool_t b_timeshift;
259 /*****************************************************************************
261 *****************************************************************************/
265 static int Demux( demux_t *p_demux );
266 static int Control( demux_t *, int, va_list );
267 static void Run ( services_discovery_t *p_sd );
269 /* Main parsing functions */
270 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
271 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
272 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
273 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint16_t, sdp_t * );
274 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
276 /* Helper functions */
277 static inline attribute_t *MakeAttribute (const char *str);
278 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
279 static inline void FreeAttribute (attribute_t *a);
280 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
283 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
284 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
285 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
286 static void FreeSDP( sdp_t *p_sdp );
288 static inline int min_int( int a, int b )
290 return a > b ? b : a;
293 /*****************************************************************************
294 * Open: initialize and create stuff
295 *****************************************************************************/
296 static int Open( vlc_object_t *p_this )
298 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
299 services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
300 malloc( sizeof( services_discovery_sys_t ) );
302 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;
332 /*****************************************************************************
333 * OpenDemux: initialize and create stuff
334 *****************************************************************************/
335 static int OpenDemux( vlc_object_t *p_this )
337 demux_t *p_demux = (demux_t *)p_this;
338 const uint8_t *p_peek;
339 char *psz_sdp = NULL;
341 int errval = VLC_EGENERIC;
344 if( !var_CreateGetInteger( p_demux, "sap-parse" ) )
346 /* We want livedotcom module to parse this SDP file */
350 assert( p_demux->s ); /* this is NOT an access_demux */
353 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
356 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
359 /* Gather the complete sdp file */
360 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
362 const int i_read_max = 1024;
363 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
365 if( psz_sdp_new == NULL )
370 psz_sdp = psz_sdp_new;
372 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
373 if( (int)i_read < 0 )
375 msg_Err( p_demux, "cannot read SDP" );
380 psz_sdp[i_len] = '\0';
382 if( (int)i_read < i_read_max )
386 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
390 msg_Warn( p_demux, "invalid SDP");
394 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
396 p_sdp->psz_uri = NULL;
398 if( p_sdp->i_media_type != 33 && p_sdp->i_media_type != 32 &&
399 p_sdp->i_media_type != 14 )
402 if( p_sdp->psz_uri == NULL ) goto error;
404 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
405 p_demux->p_sys->p_sdp = p_sdp;
406 p_demux->pf_control = Control;
407 p_demux->pf_demux = Demux;
414 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
415 stream_Seek( p_demux->s, 0 );
419 /*****************************************************************************
421 *****************************************************************************/
422 static void Close( vlc_object_t *p_this )
424 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
425 services_discovery_sys_t *p_sys = p_sd->p_sys;
429 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
431 net_Close( p_sys->pi_fd[i] );
433 FREENULL( p_sys->pi_fd );
436 if( config_GetInt( p_sd, "sap-cache" ) )
442 for( i = p_sys->i_announces - 1; i>= 0; i-- )
444 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
446 FREENULL( p_sys->pp_announces );
451 /*****************************************************************************
452 * CloseDemux: Close the demuxer
453 *****************************************************************************/
454 static void CloseDemux( vlc_object_t *p_this )
456 demux_t *p_demux = (demux_t *)p_this;
459 if( p_demux->p_sys->p_sdp ) { FreeSDP( p_demux->p_sys->p_sdp ); p_demux->p_sys->p_sdp = NULL; }
460 free( p_demux->p_sys );
464 /*****************************************************************************
465 * Run: main SAP thread
466 *****************************************************************************
467 * Listens to SAP packets, and sends them to packet_handle
468 *****************************************************************************/
469 #define MAX_SAP_BUFFER 5000
471 static void Run( services_discovery_t *p_sd )
477 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
478 * DNS queries, even if the DNS server returns an error with milliseconds.
479 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
480 * Winsock 1.1 from Windows 95, if not Windows 3.1.
481 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
482 * we have to open sockets in Run() rather than Open(). */
483 if( var_CreateGetInteger( p_sd, "sap-ipv4" ) )
485 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
486 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
487 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
488 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
490 if( var_CreateGetInteger( p_sd, "sap-ipv6" ) )
492 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
495 struct if_nameindex *l = if_nameindex ();
498 char *ptr = strchr (psz_address, '%') + 1;
499 for (unsigned i = 0; l[i].if_index; i++)
501 strcpy (ptr, l[i].if_name);
502 InitSocket (p_sd, psz_address, SAP_PORT);
504 if_freenameindex (l);
507 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
508 which if_nameindex uses internally anyway */
510 // first create a dummy socket to pin down the protocol family
511 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
512 if( s != INVALID_SOCKET )
514 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
515 size_t len = sizeof(ifaces);
517 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
519 unsigned ifcount = len/sizeof(INTERFACE_INFO);
520 char *ptr = strchr (psz_address, '%') + 1;
521 for(unsigned i = 1; i<=ifcount; ++i )
523 // append link-local zone identifier
524 sprintf(ptr, "%d", i);
530 *strchr (psz_address, '%') = '\0';
532 static const char ipv6_scopes[] = "1456789ABCDE";
533 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
535 psz_address[3] = *c_scope;
536 InitSocket( p_sd, psz_address, SAP_PORT );
540 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
541 if( psz_addr && *psz_addr )
543 InitSocket( p_sd, psz_addr, SAP_PORT );
547 if( p_sd->p_sys->i_fd == 0 )
549 msg_Err( p_sd, "unable to listen on any address" );
553 vlc_object_lock( p_sd );
555 /* read SAP packets */
556 while( vlc_object_alive( p_sd ) )
558 unsigned n = p_sd->p_sys->i_fd;
559 struct pollfd ufd[n+1];
561 for (unsigned i = 0; i < n; i++)
563 ufd[i].fd = p_sd->p_sys->pi_fd[i];
564 ufd[i].events = POLLIN;
568 /* Make sure we track vlc_object_signal() */
569 ufd[n].fd = vlc_object_waitpipe( p_sd );
570 ufd[n].events = POLLIN | POLLHUP;
573 if( ufd[n].fd == -1 )
575 /* On windows, fd will be -1, as we can't select on a pipe()-ed
576 * fildes. Because we have no other solution to track that
577 * object is killed, we make sure the timeout won't be to long. */
578 if( timeout > 1000 || timeout == -1 )
582 vlc_object_unlock( p_sd );
584 if (poll (ufd, n+1, timeout) > 0)
586 for (unsigned i = 0; i < n; i++)
590 uint8_t p_buffer[MAX_SAP_BUFFER+1];
593 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
594 MAX_SAP_BUFFER, VLC_FALSE);
596 msg_Warn (p_sd, "receive error: %m");
599 /* Parse the packet */
600 p_buffer[i_read] = '\0';
601 ParseSAP (p_sd, p_buffer, i_read);
607 mtime_t now = mdate();
609 /* A 1 hour timeout correspong to the RFC Implicit timeout.
610 * This timeout is tuned in the following loop. */
611 timeout = 1000 * 60 * 60;
613 /* Check for items that need deletion */
614 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
616 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
617 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
618 mtime_t i_last_period = now - p_announce->i_last;
620 /* Remove the annoucement, if the last announcement was 1 hour ago
621 * or if the last packet emitted was 3 times the average time
622 * between two packets */
623 if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
624 i_last_period > i_timeout )
626 RemoveAnnounce( p_sd, p_announce );
630 /* Compute next timeout */
631 if( p_announce->i_period_trust > 5 )
632 timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
633 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
637 if( !p_sd->p_sys->i_announces )
638 timeout = -1; /* We can safely poll indefinitly. */
639 else if( timeout < 200 )
640 timeout = 200; /* Don't wakeup too fast. */
642 vlc_object_lock( p_sd );
644 vlc_object_unlock( p_sd );
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 playlist_t *p_playlist = pl_Yield( p_demux );
658 p_input = (input_thread_t *)vlc_object_find( p_demux, VLC_OBJECT_INPUT,
663 msg_Err( p_demux, "parent input could not be found" );
667 p_parent_input = input_GetItem( p_input );
669 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
670 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
672 vlc_mutex_lock( &p_parent_input->lock );
674 p_parent_input->i_type = ITEM_TYPE_NET;
676 if( p_playlist->status.p_item &&
677 p_playlist->status.p_item->p_input == p_parent_input )
679 playlist_Control( p_playlist, PLAYLIST_VIEWPLAY, VLC_TRUE,
680 p_playlist->status.p_node, p_playlist->status.p_item );
683 vlc_mutex_unlock( &p_parent_input->lock );
684 vlc_object_release( p_input );
685 vlc_object_release( p_playlist );
690 static int Control( demux_t *p_demux, int i_query, va_list 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 vlc_bool_t b_ipv6 = (flags & 0x10) != 0;
720 vlc_bool_t b_need_delete = (flags & 0x04) != 0;
724 msg_Dbg( p_sd, "encrypted packet, unsupported" );
728 vlc_bool_t 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 == VLC_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 ) return VLC_EGENERIC;
813 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
815 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
817 /* FIXME: we create a new announce each time the sdp changes */
818 if( IsSameSession( p_announce->p_sdp, p_sdp ) )
820 /* We don't support delete announcement as they can easily
821 * Be used to highjack an announcement by a third party.
822 * Intead we cleverly implement Implicit Announcement removal.
824 * if( b_need_delete )
825 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
831 /* No need to go after six, as we start to trust the
832 * average period at six */
833 if( p_announce->i_period_trust <= 5 )
834 p_announce->i_period_trust++;
836 /* Compute the average period */
837 p_announce->i_period = (p_announce->i_period + (mdate() - p_announce->i_last)) / 2;
838 p_announce->i_last = mdate();
840 FreeSDP( p_sdp ); p_sdp = NULL;
845 CreateAnnounce( p_sd, i_hash, p_sdp );
851 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint16_t i_hash,
854 input_item_t *p_input;
855 const char *psz_value;
856 sap_announce_t *p_sap = (sap_announce_t *)malloc(
857 sizeof(sap_announce_t ) );
858 services_discovery_sys_t *p_sys;
864 p_sap->i_last = mdate();
866 p_sap->i_period_trust = 0;
867 p_sap->i_hash = i_hash;
868 p_sap->p_sdp = p_sdp;
870 /* Create the actual playlist item here */
871 p_input = input_ItemNewWithType( VLC_OBJECT(p_sd),
872 p_sap->p_sdp->psz_uri,
873 p_sdp->psz_sessionname,
874 0, NULL, -1, ITEM_TYPE_NET );
875 p_sap->i_input_id = p_input->i_id;
882 if( p_sys->b_timeshift )
883 input_ItemAddOption( p_input, ":access-filter=timeshift" );
885 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
886 if( psz_value != NULL )
888 input_ItemAddInfo( p_input, _("Session"), _("Tool"), "%s",
891 if( strcmp( p_sdp->username, "-" ) )
893 input_ItemAddInfo( p_input, _("Session"), _("User"), "%s",
898 if (p_sap->p_sdp->mediac >= 1)
899 psz_value = FindAttribute (p_sap->p_sdp, 0, "x-plgroup");
901 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "x-plgroup" );
903 services_discovery_AddItem( p_sd, p_input, psz_value /* category name */ );
905 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
906 vlc_gc_decref( p_input );
911 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
914 /* Look for media attribute, and fallback to session */
915 return GetAttribute (sdp->mediav[media].pp_attributes,
916 sdp->mediav[media].i_attributes, name)
917 ?: GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
921 /* Fill p_sdp->psz_uri */
922 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
924 if (p_sdp->mediac == 0)
926 msg_Dbg (p_obj, "Ignoring SDP with no media");
930 for (unsigned i = 1; i < p_sdp->mediac; i++)
932 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
933 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
934 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
935 p_sdp->mediav->addrlen))
937 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
942 if (p_sdp->mediav->n_addr != 1)
944 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
953 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
954 p_sdp->mediav->addrlen, psz_uri + 1,
955 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
958 if (strchr (psz_uri + 1, ':'))
961 strcat (psz_uri, "]");
967 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
968 if (sdp_proto == NULL)
971 char *subtype = strchr (sdp_proto, ' ');
974 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
975 p_sdp->i_media_type = 0;
980 p_sdp->i_media_type = atoi (subtype);
982 if (p_sdp->i_media_type == 0)
983 p_sdp->i_media_type = 33;
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 "I64Fu" "I64Fu" 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 EnsureUTF8 (p_sdp->psz_sessionname);
1250 if (p_sdp->psz_sessionname == NULL)
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->i_input_id > -1 )
1525 playlist_DeleteFromInput( pl_Get(p_sd), p_announce->i_input_id, VLC_FALSE );
1527 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1529 if( p_sd->p_sys->pp_announces[i] == p_announce )
1531 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1542 static vlc_bool_t IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1544 /* A session is identified by
1547 * - network type (which is always IN),
1548 * - address type (currently, this means IP version),
1551 if (strcmp (p_sdp1->username, p_sdp2->username)
1552 || (p_sdp1->session_id != p_sdp2->session_id)
1553 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1554 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1561 static inline attribute_t *MakeAttribute (const char *str)
1563 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1567 strcpy (a->name, str);
1568 EnsureUTF8 (a->name);
1569 char *value = strchr (a->name, ':');
1581 static const char *GetAttribute (attribute_t **tab, unsigned n,
1584 for (unsigned i = 0; i < n; i++)
1585 if (strcasecmp (tab[i]->name, name) == 0)
1586 return tab[i]->value;
1591 static inline void FreeAttribute (attribute_t *a)