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 #define VLC_MODULE_LICENSE VLC_LICENSE_GPL_2_PLUS
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
38 #include <vlc_demux.h>
39 #include <vlc_services_discovery.h>
41 #include <vlc_network.h>
42 #include <vlc_charset.h>
46 #ifdef HAVE_ARPA_INET_H
47 # include <arpa/inet.h>
61 /************************************************************************
62 * Macros and definitions
63 ************************************************************************/
65 #define MAX_LINE_LENGTH 256
67 /* SAP is always on that port */
69 /* Global-scope SAP address */
70 #define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
71 /* Organization-local SAP address */
72 #define SAP_V4_ORG_ADDRESS "239.195.255.255"
73 /* Local (smallest non-link-local scope) SAP address */
74 #define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
75 /* Link-local SAP address */
76 #define SAP_V4_LINK_ADDRESS "224.0.0.255"
79 /*****************************************************************************
81 *****************************************************************************/
82 #define SAP_ADDR_TEXT N_( "SAP multicast address" )
83 #define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
84 "right addresses to listen to. However, you " \
85 "can specify a specific address." )
86 #define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
87 #define SAP_TIMEOUT_LONGTEXT N_( \
88 "Delay after which SAP items get deleted if no new announcement " \
90 #define SAP_PARSE_TEXT N_( "Try to parse the announce" )
91 #define SAP_PARSE_LONGTEXT N_( \
92 "This enables actual parsing of the announces by the SAP module. " \
93 "Otherwise, all announcements are parsed by the \"live555\" " \
94 "(RTP/RTSP) module." )
95 #define SAP_STRICT_TEXT N_( "SAP Strict mode" )
96 #define SAP_STRICT_LONGTEXT N_( \
97 "When this is set, the SAP parser will discard some non-compliant " \
101 static int Open ( vlc_object_t * );
102 static void Close( vlc_object_t * );
103 static int OpenDemux ( vlc_object_t * );
104 static void CloseDemux ( vlc_object_t * );
106 VLC_SD_PROBE_HELPER("sap", "Network streams (SAP)", SD_CAT_LAN)
109 set_shortname( N_("SAP"))
110 set_description( N_("Network streams (SAP)") )
111 set_category( CAT_PLAYLIST )
112 set_subcategory( SUBCAT_PLAYLIST_SD )
114 add_string( "sap-addr", NULL,
115 SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true )
116 add_obsolete_bool( "sap-ipv4" ) /* since 2.0.0 */
117 add_obsolete_bool( "sap-ipv6" ) /* since 2.0.0 */
118 add_integer( "sap-timeout", 1800,
119 SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true )
120 add_bool( "sap-parse", true,
121 SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true )
122 add_bool( "sap-strict", false,
123 SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true )
124 add_obsolete_bool( "sap-timeshift" ) /* Redumdant since 1.0.0 */
126 set_capability( "services_discovery", 0 )
127 set_callbacks( Open, Close )
129 VLC_SD_PROBE_SUBMODULE
132 set_description( N_("SDP Descriptions parser") )
133 add_shortcut( "sdp" )
134 set_capability( "demux", 51 )
135 set_callbacks( OpenDemux, CloseDemux )
139 /*****************************************************************************
141 *****************************************************************************/
143 typedef struct sdp_t sdp_t;
144 typedef struct attribute_t attribute_t;
145 typedef struct sap_announce_t sap_announce_t;
150 struct sdp_t *parent;
152 struct sockaddr_storage addr;
156 attribute_t **pp_attributes;
160 /* The structure that contains sdp information */
168 uint64_t session_version;
169 unsigned orig_ip_version;
170 char orig_host[1024];
173 char *psz_sessionname;
176 char *psz_sessioninfo;
184 /* a= global attributes */
186 attribute_t **pp_attributes;
188 /* medias (well, we only support one atm) */
190 struct sdp_media_t *mediav;
199 struct sap_announce_t
203 uint8_t i_period_trust;
206 uint32_t i_source[4];
208 /* SAP annnounces must only contain one SDP */
211 input_item_t * p_item;
214 struct services_discovery_sys_t
218 /* Socket descriptors */
222 /* Table of announces */
224 struct sap_announce_t **pp_announces;
238 /*****************************************************************************
240 *****************************************************************************/
244 static int Demux( demux_t *p_demux );
245 static int Control( demux_t *, int, va_list );
246 static void *Run ( void *p_sd );
248 /* Main parsing functions */
249 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
250 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
251 static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
252 static sap_announce_t *CreateAnnounce( services_discovery_t *, uint32_t *, uint16_t, sdp_t * );
253 static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
255 /* Helper functions */
256 static inline attribute_t *MakeAttribute (const char *str);
257 static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
258 static inline void FreeAttribute (attribute_t *a);
259 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
262 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
263 static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
264 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
265 static void FreeSDP( sdp_t *p_sdp );
267 static inline int min_int( int a, int b )
269 return a > b ? b : a;
272 static bool IsWellKnownPayload (int type)
275 { /* Should be in sync with modules/demux/rtp.c */
276 case 0: /* PCMU/8000 */
278 case 8: /* PCMA/8000 */
279 case 10: /* L16/44100/2 */
280 case 11: /* L16/44100 */
282 case 14: /* MPA/90000 */
283 case 32: /* MPV/90000 */
284 case 33: /* MP2/90000 */
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" );
308 p_sys->b_strict = var_CreateGetBool( p_sd, "sap-strict");
309 p_sys->b_parse = var_CreateGetBool( p_sd, "sap-parse" );
311 p_sys->i_announces = 0;
312 p_sys->pp_announces = NULL;
313 /* TODO: create sockets here, and fix racy sockets table */
314 if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
323 /*****************************************************************************
324 * OpenDemux: initialize and create stuff
325 *****************************************************************************/
326 static int OpenDemux( vlc_object_t *p_this )
328 demux_t *p_demux = (demux_t *)p_this;
329 const uint8_t *p_peek;
330 char *psz_sdp = NULL;
332 int errval = VLC_EGENERIC;
335 if( !var_CreateGetBool( p_demux, "sap-parse" ) )
337 /* We want livedotcom module to parse this SDP file */
341 assert( p_demux->s ); /* this is NOT an access_demux */
344 if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
347 if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
350 /* Gather the complete sdp file */
351 for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
353 const int i_read_max = 1024;
354 char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max + 1 );
356 if( psz_sdp_new == NULL )
361 psz_sdp = psz_sdp_new;
363 i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
364 if( (int)i_read < 0 )
366 msg_Err( p_demux, "cannot read SDP" );
371 psz_sdp[i_len] = '\0';
373 if( (int)i_read < i_read_max )
377 p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
381 msg_Warn( p_demux, "invalid SDP");
385 if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
387 p_sdp->psz_uri = NULL;
389 if (!IsWellKnownPayload (p_sdp->i_media_type))
391 if( p_sdp->psz_uri == NULL ) goto error;
393 p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
394 if( unlikely( !p_demux->p_sys ) )
396 p_demux->p_sys->p_sdp = p_sdp;
397 p_demux->pf_control = Control;
398 p_demux->pf_demux = Demux;
405 if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
406 stream_Seek( p_demux->s, 0 );
410 /*****************************************************************************
412 *****************************************************************************/
413 static void Close( vlc_object_t *p_this )
415 services_discovery_t *p_sd = ( services_discovery_t* )p_this;
416 services_discovery_sys_t *p_sys = p_sd->p_sys;
419 vlc_cancel (p_sys->thread);
420 vlc_join (p_sys->thread, NULL);
422 for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
424 net_Close( p_sys->pi_fd[i] );
426 FREENULL( p_sys->pi_fd );
428 for( i = p_sys->i_announces - 1; i>= 0; i-- )
430 RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
432 FREENULL( p_sys->pp_announces );
437 /*****************************************************************************
438 * CloseDemux: Close the demuxer
439 *****************************************************************************/
440 static void CloseDemux( vlc_object_t *p_this )
442 demux_t *p_demux = (demux_t *)p_this;
444 if( p_demux->p_sys->p_sdp )
445 FreeSDP( p_demux->p_sys->p_sdp );
446 free( p_demux->p_sys );
449 /*****************************************************************************
450 * Run: main SAP thread
451 *****************************************************************************
452 * Listens to SAP packets, and sends them to packet_handle
453 *****************************************************************************/
454 #define MAX_SAP_BUFFER 5000
456 static void *Run( void *data )
458 services_discovery_t *p_sd = data;
462 int canc = vlc_savecancel ();
464 /* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
465 * DNS queries, even if the DNS server returns an error with milliseconds.
466 * You don't want to know why the bug (as of XP SP2) wasn't fixed since
467 * Winsock 1.1 from Windows 95, if not Windows 3.1.
468 * Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
469 * we have to open sockets in Run() rather than Open(). */
470 InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
471 InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
472 InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
473 InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
475 char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
477 struct if_nameindex *l = if_nameindex ();
480 char *ptr = strchr (psz_address, '%') + 1;
481 for (unsigned i = 0; l[i].if_index; i++)
483 strcpy (ptr, l[i].if_name);
484 InitSocket (p_sd, psz_address, SAP_PORT);
486 if_freenameindex (l);
489 /* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
490 which if_nameindex uses internally anyway */
492 // first create a dummy socket to pin down the protocol family
493 SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
494 if( s != INVALID_SOCKET )
496 INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
497 DWORD len = sizeof(ifaces);
499 if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
501 unsigned ifcount = len/sizeof(INTERFACE_INFO);
502 char *ptr = strchr (psz_address, '%') + 1;
503 for(unsigned i = 1; i<=ifcount; ++i )
505 // append link-local zone identifier
506 sprintf(ptr, "%d", i);
512 *strchr (psz_address, '%') = '\0';
514 static const char ipv6_scopes[] = "1456789ABCDE";
515 for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
517 psz_address[3] = *c_scope;
518 InitSocket( p_sd, psz_address, SAP_PORT );
521 psz_addr = var_CreateGetString( p_sd, "sap-addr" );
522 if( psz_addr && *psz_addr )
523 InitSocket( p_sd, psz_addr, SAP_PORT );
526 if( p_sd->p_sys->i_fd == 0 )
528 msg_Err( p_sd, "unable to listen on any address" );
532 /* read SAP packets */
535 vlc_restorecancel (canc);
536 unsigned n = p_sd->p_sys->i_fd;
537 struct pollfd ufd[n];
539 for (unsigned i = 0; i < n; i++)
541 ufd[i].fd = p_sd->p_sys->pi_fd[i];
542 ufd[i].events = POLLIN;
546 int val = poll (ufd, n, timeout);
547 canc = vlc_savecancel ();
550 for (unsigned i = 0; i < n; i++)
554 uint8_t p_buffer[MAX_SAP_BUFFER+1];
557 i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
558 MAX_SAP_BUFFER, false);
560 msg_Warn (p_sd, "receive error: %s",
561 vlc_strerror_c(errno));
564 /* Parse the packet */
565 p_buffer[i_read] = '\0';
566 ParseSAP (p_sd, p_buffer, i_read);
572 mtime_t now = mdate();
574 /* A 1 hour timeout correspond to the RFC Implicit timeout.
575 * This timeout is tuned in the following loop. */
576 timeout = 1000 * 60 * 60;
578 /* Check for items that need deletion */
579 for( i = 0; i < p_sd->p_sys->i_announces; i++ )
581 mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
582 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
583 mtime_t i_last_period = now - p_announce->i_last;
585 /* Remove the announcement, if the last announcement was 1 hour ago
586 * or if the last packet emitted was 10 times the average time
587 * between two packets */
588 if( ( p_announce->i_period_trust > 5 && i_last_period > 10 * p_announce->i_period ) ||
589 i_last_period > i_timeout )
591 RemoveAnnounce( p_sd, p_announce );
595 /* Compute next timeout */
596 if( p_announce->i_period_trust > 5 )
597 timeout = min_int((10 * p_announce->i_period - i_last_period) / 1000, timeout);
598 timeout = min_int((i_timeout - i_last_period)/1000, timeout);
602 if( !p_sd->p_sys->i_announces )
603 timeout = -1; /* We can safely poll indefinitely. */
604 else if( timeout < 200 )
605 timeout = 200; /* Don't wakeup too fast. */
607 vlc_assert_unreachable ();
610 /**********************************************************************
611 * Demux: reads and demuxes data packets
612 * Return -1 if error, 0 if EOF, 1 else
613 **********************************************************************/
614 static int Demux( demux_t *p_demux )
616 sdp_t *p_sdp = p_demux->p_sys->p_sdp;
617 input_thread_t *p_input;
618 input_item_t *p_parent_input;
620 p_input = demux_GetParentInput( p_demux );
624 msg_Err( p_demux, "parent input could not be found" );
628 /* This item hasn't been held by input_GetItem
629 * don't release it */
630 p_parent_input = input_GetItem( p_input );
632 input_item_SetURI( p_parent_input, p_sdp->psz_uri );
633 input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
634 if( p_sdp->rtcp_port )
637 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
639 input_item_AddOption( p_parent_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
644 vlc_mutex_lock( &p_parent_input->lock );
646 p_parent_input->i_type = ITEM_TYPE_STREAM;
648 vlc_mutex_unlock( &p_parent_input->lock );
649 vlc_object_release( p_input );
653 static int Control( demux_t *p_demux, int i_query, va_list args )
655 VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
659 /**************************************************************
661 **************************************************************/
663 /* i_read is at least > 6 */
664 static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
669 const uint8_t *end = buf + len;
671 uint32_t i_source[4];
673 assert (buf[len] == '\0');
678 uint8_t flags = buf[0];
679 uint8_t auth_len = buf[1];
681 /* First, check the sap announce is correct */
682 if ((flags >> 5) != 1)
685 bool b_ipv6 = (flags & 0x10) != 0;
686 bool b_need_delete = (flags & 0x04) != 0;
690 msg_Dbg( p_sd, "encrypted packet, unsupported" );
694 bool b_compressed = (flags & 0x01) != 0;
696 uint16_t i_hash = U16_AT (buf + 2);
698 if( p_sd->p_sys->b_strict && i_hash == 0 )
700 msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
707 for( int i = 0; i < 4; i++,buf+=4)
708 i_source[i] = U32_AT(buf);
712 memset(i_source, 0, sizeof(i_source));
713 i_source[3] = U32_AT(buf);
721 uint8_t *decomp = NULL;
724 int newsize = Decompress (buf, &decomp, end - buf);
727 msg_Dbg( p_sd, "decompression of SAP packet failed" );
731 decomp = realloc (decomp, newsize + 1);
732 decomp[newsize] = '\0';
733 psz_sdp = (const char *)decomp;
738 psz_sdp = (const char *)buf;
742 /* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
743 assert( psz_sdp[len] == '\0');
745 /* Skip payload type */
746 /* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
747 if (strncmp (psz_sdp, "v=0", 3))
749 size_t clen = strlen (psz_sdp) + 1;
751 if (strcmp (psz_sdp, "application/sdp"))
753 msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
757 // skips content type
766 p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
771 p_sdp->psz_sdp = psz_sdp;
773 /* Decide whether we should add a playlist item for this SDP */
774 /* Parse connection information (c= & m= ) */
775 if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
776 p_sdp->psz_uri = NULL;
778 /* Multi-media or no-parse -> pass to LIVE.COM */
779 if( !IsWellKnownPayload( p_sdp->i_media_type ) || !p_sd->p_sys->b_parse )
781 free( p_sdp->psz_uri );
782 if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
783 p_sdp->psz_uri = NULL;
786 if( p_sdp->psz_uri == NULL )
792 for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
794 sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
796 if( ( !i_hash && IsSameSession( p_announce->p_sdp, p_sdp ) )
797 || ( i_hash && p_announce->i_hash == i_hash
798 && !memcmp(p_announce->i_source, i_source, sizeof(i_source)) ) )
800 /* We don't support delete announcement as they can easily
801 * Be used to highjack an announcement by a third party.
802 * Instead we cleverly implement Implicit Announcement removal.
804 * if( b_need_delete )
805 * RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
811 /* No need to go after six, as we start to trust the
812 * average period at six */
813 if( p_announce->i_period_trust <= 5 )
814 p_announce->i_period_trust++;
816 /* Compute the average period */
817 mtime_t now = mdate();
818 p_announce->i_period = ( p_announce->i_period * (p_announce->i_period_trust-1) + (now - p_announce->i_last) ) / p_announce->i_period_trust;
819 p_announce->i_last = now;
827 CreateAnnounce( p_sd, i_source, i_hash, p_sdp );
836 sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint32_t *i_source, uint16_t i_hash,
839 input_item_t *p_input;
840 const char *psz_value;
841 sap_announce_t *p_sap = (sap_announce_t *)malloc(
842 sizeof(sap_announce_t ) );
843 services_discovery_sys_t *p_sys;
849 p_sap->i_last = mdate();
851 p_sap->i_period_trust = 0;
852 p_sap->i_hash = i_hash;
853 memcpy (p_sap->i_source, i_source, sizeof(p_sap->i_source));
854 p_sap->p_sdp = p_sdp;
856 /* Released in RemoveAnnounce */
857 p_input = input_item_NewWithType( p_sap->p_sdp->psz_uri,
858 p_sdp->psz_sessionname,
859 0, NULL, 0, -1, ITEM_TYPE_STREAM );
860 if( unlikely(p_input == NULL) )
865 p_sap->p_item = p_input;
867 vlc_meta_t *p_meta = vlc_meta_New();
868 if( likely(p_meta != NULL) )
870 vlc_meta_Set( p_meta, vlc_meta_Description, p_sdp->psz_sessioninfo );
871 p_input->p_meta = p_meta;
874 if( p_sdp->rtcp_port )
877 if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
879 input_item_AddOption( p_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
884 psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
885 if( psz_value != NULL )
887 input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
889 if( strcmp( p_sdp->username, "-" ) )
891 input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
895 /* Handle category */
896 psz_value = GetAttribute(p_sap->p_sdp->pp_attributes,
897 p_sap->p_sdp->i_attributes, "cat");
898 if (psz_value != NULL)
900 /* a=cat provides a dot-separated hierarchy.
901 * For the time being only replace dots with pipe. TODO: FIXME */
902 char *str = strdup(psz_value);
903 if (likely(str != NULL))
904 for (char *p = strchr(str, '.'); p != NULL; p = strchr(p, '.'))
906 services_discovery_AddItem(p_sd, p_input, str ? str : psz_value);
911 /* backward compatibility with VLC 0.7.3-2.0.0 senders */
912 psz_value = GetAttribute(p_sap->p_sdp->pp_attributes,
913 p_sap->p_sdp->i_attributes, "x-plgroup");
914 services_discovery_AddItem(p_sd, p_input, psz_value);
917 TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
923 static const char *FindAttribute (const sdp_t *sdp, unsigned media,
926 /* Look for media attribute, and fallback to session */
927 const char *attr = GetAttribute (sdp->mediav[media].pp_attributes,
928 sdp->mediav[media].i_attributes, name);
930 attr = GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
935 /* Fill p_sdp->psz_uri */
936 static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
938 if (p_sdp->mediac == 0)
940 msg_Dbg (p_obj, "Ignoring SDP with no media");
944 for (unsigned i = 1; i < p_sdp->mediac; i++)
946 if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
947 || (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
948 || memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
949 p_sdp->mediav->addrlen))
951 msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
956 if (p_sdp->mediav->n_addr != 1)
958 msg_Dbg (p_obj, "Layered encoding not supported -> live555");
967 if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
968 p_sdp->mediav->addrlen, psz_uri + 1,
969 sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
972 if (strchr (psz_uri + 1, ':'))
975 strcat (psz_uri, "]");
981 char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
982 if (sdp_proto == NULL)
985 char *subtype = strchr (sdp_proto, ' ');
988 msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
995 /* FIXME: check for multiple payload types in RTP/AVP case.
996 * FIXME: check for "mpeg" subtype in raw udp case. */
997 if (!strcasecmp (sdp_proto, "udp"))
998 p_sdp->i_media_type = 33;
1000 p_sdp->i_media_type = atoi (subtype);
1003 /* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
1004 * 0x1: Connection-Oriented media. */
1005 static const char proto_match[] =
1007 "RTP/AVP\0" "rtp\0\0"
1008 "UDPLite/RTP/AVP\0" "udplite\0\0"
1009 "DCCP/RTP/AVP\0" "dccp\0\1"
1010 "TCP/RTP/AVP\0" "rtptcp\0\1"
1013 const char *vlc_proto = NULL;
1015 for (const char *proto = proto_match; *proto;)
1017 if (strcasecmp (proto, sdp_proto) == 0)
1019 vlc_proto = proto + strlen (proto) + 1;
1020 flags = vlc_proto[strlen (vlc_proto) + 1];
1023 proto += strlen (proto) + 1;
1024 proto += strlen (proto) + 2;
1028 if (vlc_proto == NULL)
1030 msg_Dbg (p_obj, "unknown SDP media protocol: %s",
1031 p_sdp->mediav[0].fmt);
1032 return VLC_EGENERIC;
1035 if (!strcmp (vlc_proto, "udp") || FindAttribute (p_sdp, 0, "rtcp-mux"))
1036 p_sdp->rtcp_port = 0;
1039 const char *rtcp = FindAttribute (p_sdp, 0, "rtcp");
1041 p_sdp->rtcp_port = atoi (rtcp);
1043 if (port & 1) /* odd port -> RTCP; next even port -> RTP */
1044 p_sdp->rtcp_port = port++;
1045 else /* even port -> RTP; next odd port -> RTCP */
1046 p_sdp->rtcp_port = port + 1;
1051 /* Connection-oriented media */
1052 const char *setup = FindAttribute (p_sdp, 0, "setup");
1054 setup = "active"; /* default value */
1056 if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
1058 msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
1059 return VLC_EGENERIC;
1062 if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
1068 /* Non-connected (normally multicast) media */
1069 char psz_source[258] = "";
1070 const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
1071 if (sfilter != NULL)
1073 char psz_source_ip[256];
1076 if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
1077 psz_source_ip) == 2)
1079 /* According to RFC4570, FQDNs can be used for source-filters,
1080 * but -seriously- this is impractical */
1086 struct in6_addr addr;
1087 if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
1088 && (inet_ntop (AF_INET6, &addr, psz_source + 1,
1089 sizeof (psz_source) - 2) != NULL))
1091 psz_source[0] = '[';
1092 psz_source[strlen (psz_source)] = ']';
1099 struct in_addr addr;
1100 if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
1101 && (inet_ntop (AF_INET, &addr, psz_source,
1102 sizeof (psz_source)) == NULL))
1110 if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
1119 static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
1120 socklen_t *addrlen, unsigned *number)
1123 unsigned fam, n1, n2;
1125 int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
1133 addr->ss_family = AF_INET6;
1137 *addrlen = sizeof (struct sockaddr_in6);
1139 if (inet_pton (AF_INET6, host,
1140 &((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
1143 *number = (res >= 3) ? n1 : 1;
1148 addr->ss_family = AF_INET;
1152 *addrlen = sizeof (struct sockaddr_in);
1154 if (inet_pton (AF_INET, host,
1155 &((struct sockaddr_in *)addr)->sin_addr) <= 0)
1158 *number = (res >= 4) ? n2 : 1;
1168 /***********************************************************************
1169 * ParseSDP : SDP parsing
1170 * *********************************************************************
1171 * Validate SDP and parse all fields
1172 ***********************************************************************/
1173 static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
1175 if( psz_sdp == NULL )
1178 sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
1183 struct sockaddr_storage glob_addr;
1184 memset (&glob_addr, 0, sizeof (glob_addr));
1185 socklen_t glob_len = 0;
1186 unsigned glob_count = 1;
1189 /* TODO: use iconv and charset attribute instead of EnsureUTF8 */
1192 /* Extract one line */
1193 char *eol = strchr (psz_sdp, '\n');
1194 size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
1195 char line[linelen + 1];
1196 memcpy (line, psz_sdp, linelen);
1197 line[linelen] = '\0';
1199 psz_sdp += linelen + 1;
1201 /* Remove carriage return if present */
1202 eol = strchr (line, '\r');
1205 linelen = eol - line;
1206 line[linelen] = '\0';
1210 char cat = line[0], *data = line + 2;
1211 if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
1213 /* MUST ignore SDP with unknown line type */
1214 msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
1219 msg_Dbg (p_obj, "invalid SDP line: %s", line);
1223 assert (linelen >= 2);
1225 /* SDP parsing state machine
1226 * We INTERNALLY use uppercase for session, lowercase for media
1230 /* Session description */
1235 msg_Dbg (p_obj, "missing SDP version");
1238 if (strcmp (data, "0"))
1240 msg_Dbg (p_obj, "unknown SDP version: %s", data);
1250 msg_Dbg (p_obj, "missing SDP originator");
1254 if ((sscanf (data, "%63s %"SCNu64" %"SCNu64" IN IP%u %1023s",
1255 p_sdp->username, &p_sdp->session_id,
1256 &p_sdp->session_version, &p_sdp->orig_ip_version,
1257 p_sdp->orig_host) != 5)
1258 || ((p_sdp->orig_ip_version != 4)
1259 && (p_sdp->orig_ip_version != 6)))
1261 msg_Dbg (p_obj, "SDP origin not supported: %s", data);
1262 /* Or maybe out-of-range, but this looks suspicious */
1265 EnsureUTF8 (p_sdp->orig_host);
1272 if ((cat != 's') || !*data)
1274 /* MUST be present AND non-empty */
1275 msg_Dbg (p_obj, "missing SDP session name");
1278 assert (p_sdp->psz_sessionname == NULL); // no memleak here
1279 p_sdp->psz_sessionname = strdup (data);
1280 if (p_sdp->psz_sessionname == NULL)
1282 EnsureUTF8 (p_sdp->psz_sessionname);
1289 /* optional (and may be empty) */
1292 assert (p_sdp->psz_sessioninfo == NULL);
1293 p_sdp->psz_sessioninfo = strdup (data);
1294 if (p_sdp->psz_sessioninfo == NULL)
1296 EnsureUTF8 (p_sdp->psz_sessioninfo);
1317 if (ParseSDPConnection (data, &glob_addr, &glob_len,
1320 msg_Dbg (p_obj, "SDP connection infos not supported: "
1327 assert (expect == 'B');
1334 msg_Dbg (p_obj, "missing SDP time description");
1340 if ((cat == 't') || (cat == 'r'))
1355 attribute_t *p_attr = MakeAttribute (data);
1356 TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
1360 /* Media description */
1367 msg_Dbg (p_obj, "missing SDP media description");
1370 struct sdp_media_t *m;
1371 m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
1379 memset (m, 0, sizeof (*m));
1380 memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
1381 m->n_addr = glob_count;
1383 /* TODO: remember media type (if we need multiple medias) */
1384 data = strchr (data, ' ');
1387 msg_Dbg (p_obj, "missing SDP media port");
1390 port = atoi (++data);
1391 if (port <= 0 || port >= 65536)
1393 msg_Dbg (p_obj, "invalid transport port %d", port);
1396 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1398 data = strchr (data, ' ');
1401 msg_Dbg (p_obj, "missing SDP media format");
1404 m->fmt = strdup (++data);
1418 struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
1419 if (ParseSDPConnection (data, &m->addr, &m->addrlen,
1422 msg_Dbg (p_obj, "SDP connection infos not supported: "
1426 net_SetPort ((struct sockaddr *)&m->addr, htons (port));
1438 assert (expect == 'a');
1441 attribute_t *p_attr = MakeAttribute (data);
1445 TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
1446 p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
1453 msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
1457 msg_Err (p_obj, "*** BUG in SDP parser! ***");
1469 static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
1472 int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
1474 return VLC_EGENERIC;
1476 shutdown( i_fd, SHUT_WR );
1477 INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
1478 p_sd->p_sys->i_fd, i_fd);
1482 static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
1485 int i_result, i_dstsize, n = 0;
1486 unsigned char *psz_dst = NULL;
1489 memset (&d_stream, 0, sizeof (d_stream));
1491 i_result = inflateInit(&d_stream);
1492 if( i_result != Z_OK )
1495 d_stream.next_in = (Bytef *)psz_src;
1496 d_stream.avail_in = i_len;
1501 psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
1502 d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
1503 d_stream.avail_out = 1000;
1505 i_result = inflate(&d_stream, Z_NO_FLUSH);
1506 if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
1508 inflateEnd( &d_stream );
1513 while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
1514 ( i_result != Z_STREAM_END ) );
1516 i_dstsize = d_stream.total_out;
1517 inflateEnd( &d_stream );
1519 *_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
1531 static void FreeSDP( sdp_t *p_sdp )
1533 free( p_sdp->psz_sessionname );
1534 free( p_sdp->psz_sessioninfo );
1535 free( p_sdp->psz_uri );
1537 for (unsigned j = 0; j < p_sdp->mediac; j++)
1539 free (p_sdp->mediav[j].fmt);
1540 for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
1541 FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
1542 free (p_sdp->mediav[j].pp_attributes);
1544 free (p_sdp->mediav);
1546 for (int i = 0; i < p_sdp->i_attributes; i++)
1547 FreeAttribute (p_sdp->pp_attributes[i]);
1549 free (p_sdp->pp_attributes);
1553 static int RemoveAnnounce( services_discovery_t *p_sd,
1554 sap_announce_t *p_announce )
1558 if( p_announce->p_sdp )
1560 FreeSDP( p_announce->p_sdp );
1561 p_announce->p_sdp = NULL;
1564 if( p_announce->p_item )
1566 services_discovery_RemoveItem( p_sd, p_announce->p_item );
1567 vlc_gc_decref( p_announce->p_item );
1568 p_announce->p_item = NULL;
1571 for( i = 0; i< p_sd->p_sys->i_announces; i++)
1573 if( p_sd->p_sys->pp_announces[i] == p_announce )
1575 REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
1587 * Compare two sessions, when hash is not set (SAP v0)
1589 static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
1591 /* A session is identified by
1594 * - network type (which is always IN),
1595 * - address type (currently, this means IP version),
1598 if (strcmp (p_sdp1->username, p_sdp2->username)
1599 || (p_sdp1->session_id != p_sdp2->session_id)
1600 || (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
1601 || strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
1607 static inline attribute_t *MakeAttribute (const char *str)
1609 attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
1613 strcpy (a->name, str);
1614 EnsureUTF8 (a->name);
1615 char *value = strchr (a->name, ':');
1627 static const char *GetAttribute (attribute_t **tab, unsigned n,
1630 for (unsigned i = 0; i < n; i++)
1631 if (strcasecmp (tab[i]->name, name) == 0)
1632 return tab[i]->value;
1637 static inline void FreeAttribute (attribute_t *a)