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1617 lines
47 KiB
1617 lines
47 KiB
/*****************************************************************************
|
|
* sap.c : SAP interface module
|
|
*****************************************************************************
|
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* Copyright (C) 2004-2005 the VideoLAN team
|
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* Copyright © 2007 Rémi Denis-Courmont
|
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* $Id$
|
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*
|
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* Authors: Clément Stenac <zorglub@videolan.org>
|
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* Rémi Denis-Courmont
|
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*
|
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* This program is free software; you can redistribute it and/or modify
|
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* it under the terms of the GNU General Public License as published by
|
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* the Free Software Foundation; either version 2 of the License, or
|
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* (at your option) any later version.
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*
|
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
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*
|
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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|
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/*****************************************************************************
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* Includes
|
|
*****************************************************************************/
|
|
#ifdef HAVE_CONFIG_H
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|
# include "config.h"
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#endif
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|
|
|
#include <vlc_common.h>
|
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#include <vlc_plugin.h>
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|
#include <assert.h>
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|
|
|
#include <vlc_demux.h>
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#include <vlc_services_discovery.h>
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|
|
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#include <vlc_network.h>
|
|
#include <vlc_charset.h>
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|
|
|
#ifdef HAVE_UNISTD_H
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|
# include <unistd.h>
|
|
#endif
|
|
#ifdef HAVE_ARPA_INET_H
|
|
# include <arpa/inet.h>
|
|
#endif
|
|
#ifdef HAVE_POLL
|
|
# include <poll.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_ZLIB_H
|
|
# include <zlib.h>
|
|
#endif
|
|
|
|
#ifndef WIN32
|
|
# include <net/if.h>
|
|
#endif
|
|
|
|
/************************************************************************
|
|
* Macros and definitions
|
|
************************************************************************/
|
|
|
|
#define MAX_LINE_LENGTH 256
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|
|
|
/* SAP is always on that port */
|
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#define SAP_PORT 9875
|
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/* Global-scope SAP address */
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#define SAP_V4_GLOBAL_ADDRESS "224.2.127.254"
|
|
/* Organization-local SAP address */
|
|
#define SAP_V4_ORG_ADDRESS "239.195.255.255"
|
|
/* Local (smallest non-link-local scope) SAP address */
|
|
#define SAP_V4_LOCAL_ADDRESS "239.255.255.255"
|
|
/* Link-local SAP address */
|
|
#define SAP_V4_LINK_ADDRESS "224.0.0.255"
|
|
#define ADD_SESSION 1
|
|
|
|
/*****************************************************************************
|
|
* Module descriptor
|
|
*****************************************************************************/
|
|
#define SAP_ADDR_TEXT N_( "SAP multicast address" )
|
|
#define SAP_ADDR_LONGTEXT N_( "The SAP module normally chooses itself the " \
|
|
"right addresses to listen to. However, you " \
|
|
"can specify a specific address." )
|
|
#define SAP_TIMEOUT_TEXT N_( "SAP timeout (seconds)" )
|
|
#define SAP_TIMEOUT_LONGTEXT N_( \
|
|
"Delay after which SAP items get deleted if no new announcement " \
|
|
"is received." )
|
|
#define SAP_PARSE_TEXT N_( "Try to parse the announce" )
|
|
#define SAP_PARSE_LONGTEXT N_( \
|
|
"This enables actual parsing of the announces by the SAP module. " \
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|
"Otherwise, all announcements are parsed by the \"live555\" " \
|
|
"(RTP/RTSP) module." )
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#define SAP_STRICT_TEXT N_( "SAP Strict mode" )
|
|
#define SAP_STRICT_LONGTEXT N_( \
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"When this is set, the SAP parser will discard some non-compliant " \
|
|
"announcements." )
|
|
|
|
/* Callbacks */
|
|
static int Open ( vlc_object_t * );
|
|
static void Close( vlc_object_t * );
|
|
static int OpenDemux ( vlc_object_t * );
|
|
static void CloseDemux ( vlc_object_t * );
|
|
|
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VLC_SD_PROBE_HELPER("sap", "Network streams (SAP)", SD_CAT_LAN)
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|
|
vlc_module_begin ()
|
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set_shortname( N_("SAP"))
|
|
set_description( N_("Network streams (SAP)") )
|
|
set_category( CAT_PLAYLIST )
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set_subcategory( SUBCAT_PLAYLIST_SD )
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|
|
|
add_string( "sap-addr", NULL,
|
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SAP_ADDR_TEXT, SAP_ADDR_LONGTEXT, true )
|
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add_obsolete_bool( "sap-ipv4" ) /* since 2.0.0 */
|
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add_obsolete_bool( "sap-ipv6" ) /* since 2.0.0 */
|
|
add_integer( "sap-timeout", 1800,
|
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SAP_TIMEOUT_TEXT, SAP_TIMEOUT_LONGTEXT, true )
|
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add_bool( "sap-parse", true,
|
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SAP_PARSE_TEXT,SAP_PARSE_LONGTEXT, true )
|
|
add_bool( "sap-strict", false,
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SAP_STRICT_TEXT,SAP_STRICT_LONGTEXT, true )
|
|
add_obsolete_bool( "sap-timeshift" ) /* Redumdant since 1.0.0 */
|
|
|
|
set_capability( "services_discovery", 0 )
|
|
set_callbacks( Open, Close )
|
|
|
|
VLC_SD_PROBE_SUBMODULE
|
|
|
|
add_submodule ()
|
|
set_description( N_("SDP Descriptions parser") )
|
|
add_shortcut( "sdp" )
|
|
set_capability( "demux", 51 )
|
|
set_callbacks( OpenDemux, CloseDemux )
|
|
vlc_module_end ()
|
|
|
|
|
|
/*****************************************************************************
|
|
* Local structures
|
|
*****************************************************************************/
|
|
|
|
typedef struct sdp_t sdp_t;
|
|
typedef struct attribute_t attribute_t;
|
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typedef struct sap_announce_t sap_announce_t;
|
|
|
|
|
|
struct sdp_media_t
|
|
{
|
|
struct sdp_t *parent;
|
|
char *fmt;
|
|
struct sockaddr_storage addr;
|
|
socklen_t addrlen;
|
|
unsigned n_addr;
|
|
int i_attributes;
|
|
attribute_t **pp_attributes;
|
|
};
|
|
|
|
|
|
/* The structure that contains sdp information */
|
|
struct sdp_t
|
|
{
|
|
const char *psz_sdp;
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|
|
|
/* o field */
|
|
char username[64];
|
|
uint64_t session_id;
|
|
uint64_t session_version;
|
|
unsigned orig_ip_version;
|
|
char orig_host[1024];
|
|
|
|
/* s= field */
|
|
char *psz_sessionname;
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|
|
|
/* old cruft */
|
|
/* "computed" URI */
|
|
char *psz_uri;
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|
int i_media_type;
|
|
unsigned rtcp_port;
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|
|
|
/* a= global attributes */
|
|
int i_attributes;
|
|
attribute_t **pp_attributes;
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|
|
|
/* medias (well, we only support one atm) */
|
|
unsigned mediac;
|
|
struct sdp_media_t *mediav;
|
|
};
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|
|
|
struct attribute_t
|
|
{
|
|
const char *value;
|
|
char name[];
|
|
};
|
|
|
|
struct sap_announce_t
|
|
{
|
|
mtime_t i_last;
|
|
mtime_t i_period;
|
|
uint8_t i_period_trust;
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|
|
|
uint16_t i_hash;
|
|
uint32_t i_source[4];
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|
|
|
/* SAP annnounces must only contain one SDP */
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|
sdp_t *p_sdp;
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|
|
|
input_item_t * p_item;
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};
|
|
|
|
struct services_discovery_sys_t
|
|
{
|
|
vlc_thread_t thread;
|
|
|
|
/* Socket descriptors */
|
|
int i_fd;
|
|
int *pi_fd;
|
|
|
|
/* Table of announces */
|
|
int i_announces;
|
|
struct sap_announce_t **pp_announces;
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|
|
|
/* Modes */
|
|
bool b_strict;
|
|
bool b_parse;
|
|
|
|
int i_timeout;
|
|
};
|
|
|
|
struct demux_sys_t
|
|
{
|
|
sdp_t *p_sdp;
|
|
};
|
|
|
|
/*****************************************************************************
|
|
* Local prototypes
|
|
*****************************************************************************/
|
|
|
|
|
|
/* Main functions */
|
|
static int Demux( demux_t *p_demux );
|
|
static int Control( demux_t *, int, va_list );
|
|
static void *Run ( void *p_sd );
|
|
|
|
/* Main parsing functions */
|
|
static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp );
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static int ParseSAP( services_discovery_t *p_sd, const uint8_t *p_buffer, size_t i_read );
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static sdp_t *ParseSDP (vlc_object_t *p_sd, const char *psz_sdp);
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static sap_announce_t *CreateAnnounce( services_discovery_t *, uint32_t *, uint16_t, sdp_t * );
|
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static int RemoveAnnounce( services_discovery_t *p_sd, sap_announce_t *p_announce );
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|
|
/* Helper functions */
|
|
static inline attribute_t *MakeAttribute (const char *str);
|
|
static const char *GetAttribute (attribute_t **tab, unsigned n, const char *name);
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static inline void FreeAttribute (attribute_t *a);
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static const char *FindAttribute (const sdp_t *sdp, unsigned media,
|
|
const char *name);
|
|
|
|
static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 );
|
|
static int InitSocket( services_discovery_t *p_sd, const char *psz_address, int i_port );
|
|
static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len );
|
|
static void FreeSDP( sdp_t *p_sdp );
|
|
|
|
static inline int min_int( int a, int b )
|
|
{
|
|
return a > b ? b : a;
|
|
}
|
|
|
|
static bool IsWellKnownPayload (int type)
|
|
{
|
|
switch (type)
|
|
{ /* Should be in sync with modules/demux/rtp.c */
|
|
case 0: /* PCMU/8000 */
|
|
case 3:
|
|
case 8: /* PCMA/8000 */
|
|
case 10: /* L16/44100/2 */
|
|
case 11: /* L16/44100 */
|
|
case 12:
|
|
case 14: /* MPA/90000 */
|
|
case 32: /* MPV/90000 */
|
|
case 33: /* MP2/90000 */
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Open: initialize and create stuff
|
|
*****************************************************************************/
|
|
static int Open( vlc_object_t *p_this )
|
|
{
|
|
services_discovery_t *p_sd = ( services_discovery_t* )p_this;
|
|
services_discovery_sys_t *p_sys = (services_discovery_sys_t *)
|
|
malloc( sizeof( services_discovery_sys_t ) );
|
|
if( !p_sys )
|
|
return VLC_ENOMEM;
|
|
|
|
p_sys->i_timeout = var_CreateGetInteger( p_sd, "sap-timeout" );
|
|
|
|
p_sd->p_sys = p_sys;
|
|
|
|
p_sys->pi_fd = NULL;
|
|
p_sys->i_fd = 0;
|
|
|
|
p_sys->b_strict = var_CreateGetBool( p_sd, "sap-strict");
|
|
p_sys->b_parse = var_CreateGetBool( p_sd, "sap-parse" );
|
|
|
|
p_sys->i_announces = 0;
|
|
p_sys->pp_announces = NULL;
|
|
/* TODO: create sockets here, and fix racy sockets table */
|
|
if (vlc_clone (&p_sys->thread, Run, p_sd, VLC_THREAD_PRIORITY_LOW))
|
|
{
|
|
free (p_sys);
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* OpenDemux: initialize and create stuff
|
|
*****************************************************************************/
|
|
static int OpenDemux( vlc_object_t *p_this )
|
|
{
|
|
demux_t *p_demux = (demux_t *)p_this;
|
|
const uint8_t *p_peek;
|
|
char *psz_sdp = NULL;
|
|
sdp_t *p_sdp = NULL;
|
|
int errval = VLC_EGENERIC;
|
|
size_t i_len;
|
|
|
|
if( !var_CreateGetBool( p_demux, "sap-parse" ) )
|
|
{
|
|
/* We want livedotcom module to parse this SDP file */
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
assert( p_demux->s ); /* this is NOT an access_demux */
|
|
|
|
/* Probe for SDP */
|
|
if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 )
|
|
return VLC_EGENERIC;
|
|
|
|
if( memcmp( p_peek, "v=0\r\no=", 7 ) && memcmp( p_peek, "v=0\no=", 6 ) )
|
|
return VLC_EGENERIC;
|
|
|
|
/* Gather the complete sdp file */
|
|
for( i_len = 0, psz_sdp = NULL; i_len < 65536; )
|
|
{
|
|
const int i_read_max = 1024;
|
|
char *psz_sdp_new = realloc( psz_sdp, i_len + i_read_max );
|
|
size_t i_read;
|
|
if( psz_sdp_new == NULL )
|
|
{
|
|
errval = VLC_ENOMEM;
|
|
goto error;
|
|
}
|
|
psz_sdp = psz_sdp_new;
|
|
|
|
i_read = stream_Read( p_demux->s, &psz_sdp[i_len], i_read_max );
|
|
if( (int)i_read < 0 )
|
|
{
|
|
msg_Err( p_demux, "cannot read SDP" );
|
|
goto error;
|
|
}
|
|
i_len += i_read;
|
|
|
|
psz_sdp[i_len] = '\0';
|
|
|
|
if( (int)i_read < i_read_max )
|
|
break; // EOF
|
|
}
|
|
|
|
p_sdp = ParseSDP( VLC_OBJECT(p_demux), psz_sdp );
|
|
|
|
if( !p_sdp )
|
|
{
|
|
msg_Warn( p_demux, "invalid SDP");
|
|
goto error;
|
|
}
|
|
|
|
if( ParseConnection( VLC_OBJECT( p_demux ), p_sdp ) )
|
|
{
|
|
p_sdp->psz_uri = NULL;
|
|
}
|
|
if (!IsWellKnownPayload (p_sdp->i_media_type))
|
|
goto error;
|
|
if( p_sdp->psz_uri == NULL ) goto error;
|
|
|
|
p_demux->p_sys = (demux_sys_t *)malloc( sizeof(demux_sys_t) );
|
|
if( unlikely( !p_demux->p_sys ) )
|
|
goto error;
|
|
p_demux->p_sys->p_sdp = p_sdp;
|
|
p_demux->pf_control = Control;
|
|
p_demux->pf_demux = Demux;
|
|
|
|
FREENULL( psz_sdp );
|
|
return VLC_SUCCESS;
|
|
|
|
error:
|
|
FREENULL( psz_sdp );
|
|
if( p_sdp ) FreeSDP( p_sdp ); p_sdp = NULL;
|
|
stream_Seek( p_demux->s, 0 );
|
|
return errval;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Close:
|
|
*****************************************************************************/
|
|
static void Close( vlc_object_t *p_this )
|
|
{
|
|
services_discovery_t *p_sd = ( services_discovery_t* )p_this;
|
|
services_discovery_sys_t *p_sys = p_sd->p_sys;
|
|
int i;
|
|
|
|
vlc_cancel (p_sys->thread);
|
|
vlc_join (p_sys->thread, NULL);
|
|
|
|
for( i = p_sys->i_fd-1 ; i >= 0 ; i-- )
|
|
{
|
|
net_Close( p_sys->pi_fd[i] );
|
|
}
|
|
FREENULL( p_sys->pi_fd );
|
|
|
|
for( i = p_sys->i_announces - 1; i>= 0; i-- )
|
|
{
|
|
RemoveAnnounce( p_sd, p_sys->pp_announces[i] );
|
|
}
|
|
FREENULL( p_sys->pp_announces );
|
|
|
|
free( p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* CloseDemux: Close the demuxer
|
|
*****************************************************************************/
|
|
static void CloseDemux( vlc_object_t *p_this )
|
|
{
|
|
demux_t *p_demux = (demux_t *)p_this;
|
|
|
|
if( p_demux->p_sys->p_sdp )
|
|
FreeSDP( p_demux->p_sys->p_sdp );
|
|
free( p_demux->p_sys );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Run: main SAP thread
|
|
*****************************************************************************
|
|
* Listens to SAP packets, and sends them to packet_handle
|
|
*****************************************************************************/
|
|
#define MAX_SAP_BUFFER 5000
|
|
|
|
static void *Run( void *data )
|
|
{
|
|
services_discovery_t *p_sd = data;
|
|
char *psz_addr;
|
|
int i;
|
|
int timeout = -1;
|
|
int canc = vlc_savecancel ();
|
|
|
|
/* Braindead Winsock DNS resolver will get stuck over 2 seconds per failed
|
|
* DNS queries, even if the DNS server returns an error with milliseconds.
|
|
* You don't want to know why the bug (as of XP SP2) wasn't fixed since
|
|
* Winsock 1.1 from Windows 95, if not Windows 3.1.
|
|
* Anyway, to avoid a 30 seconds delay for failed IPv6 socket creation,
|
|
* we have to open sockets in Run() rather than Open(). */
|
|
InitSocket( p_sd, SAP_V4_GLOBAL_ADDRESS, SAP_PORT );
|
|
InitSocket( p_sd, SAP_V4_ORG_ADDRESS, SAP_PORT );
|
|
InitSocket( p_sd, SAP_V4_LOCAL_ADDRESS, SAP_PORT );
|
|
InitSocket( p_sd, SAP_V4_LINK_ADDRESS, SAP_PORT );
|
|
|
|
char psz_address[NI_MAXNUMERICHOST] = "ff02::2:7ffe%";
|
|
#ifndef WIN32
|
|
struct if_nameindex *l = if_nameindex ();
|
|
if (l != NULL)
|
|
{
|
|
char *ptr = strchr (psz_address, '%') + 1;
|
|
for (unsigned i = 0; l[i].if_index; i++)
|
|
{
|
|
strcpy (ptr, l[i].if_name);
|
|
InitSocket (p_sd, psz_address, SAP_PORT);
|
|
}
|
|
if_freenameindex (l);
|
|
}
|
|
#else
|
|
/* this is the Winsock2 equivalant of SIOCGIFCONF on BSD stacks,
|
|
which if_nameindex uses internally anyway */
|
|
|
|
// first create a dummy socket to pin down the protocol family
|
|
SOCKET s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
|
|
if( s != INVALID_SOCKET )
|
|
{
|
|
INTERFACE_INFO ifaces[10]; // Assume there will be no more than 10 IP interfaces
|
|
DWORD len = sizeof(ifaces);
|
|
|
|
if( SOCKET_ERROR != WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, &ifaces, len, &len, NULL, NULL) )
|
|
{
|
|
unsigned ifcount = len/sizeof(INTERFACE_INFO);
|
|
char *ptr = strchr (psz_address, '%') + 1;
|
|
for(unsigned i = 1; i<=ifcount; ++i )
|
|
{
|
|
// append link-local zone identifier
|
|
sprintf(ptr, "%d", i);
|
|
}
|
|
}
|
|
closesocket(s);
|
|
}
|
|
#endif
|
|
*strchr (psz_address, '%') = '\0';
|
|
|
|
static const char ipv6_scopes[] = "1456789ABCDE";
|
|
for (const char *c_scope = ipv6_scopes; *c_scope; c_scope++)
|
|
{
|
|
psz_address[3] = *c_scope;
|
|
InitSocket( p_sd, psz_address, SAP_PORT );
|
|
}
|
|
|
|
psz_addr = var_CreateGetString( p_sd, "sap-addr" );
|
|
if( psz_addr && *psz_addr )
|
|
InitSocket( p_sd, psz_addr, SAP_PORT );
|
|
free( psz_addr );
|
|
|
|
if( p_sd->p_sys->i_fd == 0 )
|
|
{
|
|
msg_Err( p_sd, "unable to listen on any address" );
|
|
return NULL;
|
|
}
|
|
|
|
/* read SAP packets */
|
|
for (;;)
|
|
{
|
|
vlc_restorecancel (canc);
|
|
unsigned n = p_sd->p_sys->i_fd;
|
|
struct pollfd ufd[n];
|
|
|
|
for (unsigned i = 0; i < n; i++)
|
|
{
|
|
ufd[i].fd = p_sd->p_sys->pi_fd[i];
|
|
ufd[i].events = POLLIN;
|
|
ufd[i].revents = 0;
|
|
}
|
|
|
|
int val = poll (ufd, n, timeout);
|
|
canc = vlc_savecancel ();
|
|
if (val > 0)
|
|
{
|
|
for (unsigned i = 0; i < n; i++)
|
|
{
|
|
if (ufd[i].revents)
|
|
{
|
|
uint8_t p_buffer[MAX_SAP_BUFFER+1];
|
|
ssize_t i_read;
|
|
|
|
i_read = net_Read (p_sd, ufd[i].fd, NULL, p_buffer,
|
|
MAX_SAP_BUFFER, false);
|
|
if (i_read < 0)
|
|
msg_Warn (p_sd, "receive error: %m");
|
|
if (i_read > 6)
|
|
{
|
|
/* Parse the packet */
|
|
p_buffer[i_read] = '\0';
|
|
ParseSAP (p_sd, p_buffer, i_read);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
mtime_t now = mdate();
|
|
|
|
/* A 1 hour timeout correspong to the RFC Implicit timeout.
|
|
* This timeout is tuned in the following loop. */
|
|
timeout = 1000 * 60 * 60;
|
|
|
|
/* Check for items that need deletion */
|
|
for( i = 0; i < p_sd->p_sys->i_announces; i++ )
|
|
{
|
|
mtime_t i_timeout = ( mtime_t ) 1000000 * p_sd->p_sys->i_timeout;
|
|
sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
|
|
mtime_t i_last_period = now - p_announce->i_last;
|
|
|
|
/* Remove the annoucement, if the last announcement was 1 hour ago
|
|
* or if the last packet emitted was 3 times the average time
|
|
* between two packets */
|
|
if( ( p_announce->i_period_trust > 5 && i_last_period > 3 * p_announce->i_period ) ||
|
|
i_last_period > i_timeout )
|
|
{
|
|
RemoveAnnounce( p_sd, p_announce );
|
|
}
|
|
else
|
|
{
|
|
/* Compute next timeout */
|
|
if( p_announce->i_period_trust > 5 )
|
|
timeout = min_int((3 * p_announce->i_period - i_last_period) / 1000, timeout);
|
|
timeout = min_int((i_timeout - i_last_period)/1000, timeout);
|
|
}
|
|
}
|
|
|
|
if( !p_sd->p_sys->i_announces )
|
|
timeout = -1; /* We can safely poll indefinitely. */
|
|
else if( timeout < 200 )
|
|
timeout = 200; /* Don't wakeup too fast. */
|
|
}
|
|
assert (0);
|
|
}
|
|
|
|
/**********************************************************************
|
|
* Demux: reads and demuxes data packets
|
|
* Return -1 if error, 0 if EOF, 1 else
|
|
**********************************************************************/
|
|
static int Demux( demux_t *p_demux )
|
|
{
|
|
sdp_t *p_sdp = p_demux->p_sys->p_sdp;
|
|
input_thread_t *p_input;
|
|
input_item_t *p_parent_input;
|
|
|
|
p_input = demux_GetParentInput( p_demux );
|
|
assert( p_input );
|
|
if( !p_input )
|
|
{
|
|
msg_Err( p_demux, "parent input could not be found" );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
/* This item hasn't been held by input_GetItem
|
|
* don't release it */
|
|
p_parent_input = input_GetItem( p_input );
|
|
|
|
input_item_SetURI( p_parent_input, p_sdp->psz_uri );
|
|
input_item_SetName( p_parent_input, p_sdp->psz_sessionname );
|
|
if( p_sdp->rtcp_port )
|
|
{
|
|
char *rtcp;
|
|
if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
|
|
{
|
|
input_item_AddOption( p_parent_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
|
|
free( rtcp );
|
|
}
|
|
}
|
|
|
|
vlc_mutex_lock( &p_parent_input->lock );
|
|
|
|
p_parent_input->i_type = ITEM_TYPE_NET;
|
|
|
|
vlc_mutex_unlock( &p_parent_input->lock );
|
|
vlc_object_release( p_input );
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int Control( demux_t *p_demux, int i_query, va_list args )
|
|
{
|
|
VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
/**************************************************************
|
|
* Local functions
|
|
**************************************************************/
|
|
|
|
/* i_read is at least > 6 */
|
|
static int ParseSAP( services_discovery_t *p_sd, const uint8_t *buf,
|
|
size_t len )
|
|
{
|
|
int i;
|
|
const char *psz_sdp;
|
|
const uint8_t *end = buf + len;
|
|
sdp_t *p_sdp;
|
|
uint32_t i_source[4];
|
|
|
|
assert (buf[len] == '\0');
|
|
|
|
if (len < 4)
|
|
return VLC_EGENERIC;
|
|
|
|
uint8_t flags = buf[0];
|
|
uint8_t auth_len = buf[1];
|
|
|
|
/* First, check the sap announce is correct */
|
|
if ((flags >> 5) != 1)
|
|
return VLC_EGENERIC;
|
|
|
|
bool b_ipv6 = (flags & 0x10) != 0;
|
|
bool b_need_delete = (flags & 0x04) != 0;
|
|
|
|
if (flags & 0x02)
|
|
{
|
|
msg_Dbg( p_sd, "encrypted packet, unsupported" );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
bool b_compressed = (flags & 0x01) != 0;
|
|
|
|
uint16_t i_hash = U16_AT (buf + 2);
|
|
|
|
if( p_sd->p_sys->b_strict && i_hash == 0 )
|
|
{
|
|
msg_Dbg( p_sd, "strict mode, discarding announce with null id hash");
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
buf += 4;
|
|
if( b_ipv6 )
|
|
{
|
|
for( int i = 0; i < 4; i++,buf+=4)
|
|
i_source[i] = U32_AT(buf);
|
|
}
|
|
else
|
|
{
|
|
memset(i_source, 0, sizeof(i_source));
|
|
i_source[3] = U32_AT(buf);
|
|
buf+=4;
|
|
}
|
|
// Skips auth data
|
|
buf += auth_len;
|
|
if (buf > end)
|
|
return VLC_EGENERIC;
|
|
|
|
uint8_t *decomp = NULL;
|
|
if( b_compressed )
|
|
{
|
|
int newsize = Decompress (buf, &decomp, end - buf);
|
|
if (newsize < 0)
|
|
{
|
|
msg_Dbg( p_sd, "decompression of SAP packet failed" );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
decomp = realloc (decomp, newsize + 1);
|
|
decomp[newsize] = '\0';
|
|
psz_sdp = (const char *)decomp;
|
|
len = newsize;
|
|
}
|
|
else
|
|
{
|
|
psz_sdp = (const char *)buf;
|
|
len = end - buf;
|
|
}
|
|
|
|
/* len is a strlen here here. both buf and decomp are len+1 where the 1 should be a \0 */
|
|
assert( psz_sdp[len] == '\0');
|
|
|
|
/* Skip payload type */
|
|
/* SAPv1 has implicit "application/sdp" payload type: first line is v=0 */
|
|
if (strncmp (psz_sdp, "v=0", 3))
|
|
{
|
|
size_t clen = strlen (psz_sdp) + 1;
|
|
|
|
if (strcmp (psz_sdp, "application/sdp"))
|
|
{
|
|
msg_Dbg (p_sd, "unsupported content type: %s", psz_sdp);
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
// skips content type
|
|
if (len <= clen)
|
|
return VLC_EGENERIC;
|
|
|
|
len -= clen;
|
|
psz_sdp += clen;
|
|
}
|
|
|
|
/* Parse SDP info */
|
|
p_sdp = ParseSDP( VLC_OBJECT(p_sd), psz_sdp );
|
|
|
|
if( p_sdp == NULL )
|
|
return VLC_EGENERIC;
|
|
|
|
p_sdp->psz_sdp = psz_sdp;
|
|
|
|
/* Decide whether we should add a playlist item for this SDP */
|
|
/* Parse connection information (c= & m= ) */
|
|
if( ParseConnection( VLC_OBJECT(p_sd), p_sdp ) )
|
|
p_sdp->psz_uri = NULL;
|
|
|
|
/* Multi-media or no-parse -> pass to LIVE.COM */
|
|
if( !IsWellKnownPayload( p_sdp->i_media_type ) || !p_sd->p_sys->b_parse )
|
|
{
|
|
free( p_sdp->psz_uri );
|
|
if (asprintf( &p_sdp->psz_uri, "sdp://%s", p_sdp->psz_sdp ) == -1)
|
|
p_sdp->psz_uri = NULL;
|
|
}
|
|
|
|
if( p_sdp->psz_uri == NULL )
|
|
{
|
|
FreeSDP( p_sdp );
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
for( i = 0 ; i< p_sd->p_sys->i_announces ; i++ )
|
|
{
|
|
sap_announce_t * p_announce = p_sd->p_sys->pp_announces[i];
|
|
/* FIXME: slow */
|
|
if( ( !i_hash && IsSameSession( p_announce->p_sdp, p_sdp ) )
|
|
|| ( i_hash && p_announce->i_hash == i_hash
|
|
&& !memcmp(p_announce->i_source, i_source, sizeof(i_source)) ) )
|
|
{
|
|
/* We don't support delete announcement as they can easily
|
|
* Be used to highjack an announcement by a third party.
|
|
* Intead we cleverly implement Implicit Announcement removal.
|
|
*
|
|
* if( b_need_delete )
|
|
* RemoveAnnounce( p_sd, p_sd->p_sys->pp_announces[i]);
|
|
* else
|
|
*/
|
|
|
|
if( !b_need_delete )
|
|
{
|
|
/* No need to go after six, as we start to trust the
|
|
* average period at six */
|
|
if( p_announce->i_period_trust <= 5 )
|
|
p_announce->i_period_trust++;
|
|
|
|
/* Compute the average period */
|
|
mtime_t now = mdate();
|
|
p_announce->i_period = (p_announce->i_period + (now - p_announce->i_last)) / 2;
|
|
p_announce->i_last = now;
|
|
}
|
|
FreeSDP( p_sdp ); p_sdp = NULL;
|
|
return VLC_SUCCESS;
|
|
}
|
|
}
|
|
|
|
CreateAnnounce( p_sd, i_source, i_hash, p_sdp );
|
|
|
|
FREENULL (decomp);
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
sap_announce_t *CreateAnnounce( services_discovery_t *p_sd, uint32_t *i_source, uint16_t i_hash,
|
|
sdp_t *p_sdp )
|
|
{
|
|
input_item_t *p_input;
|
|
const char *psz_value;
|
|
sap_announce_t *p_sap = (sap_announce_t *)malloc(
|
|
sizeof(sap_announce_t ) );
|
|
services_discovery_sys_t *p_sys;
|
|
if( p_sap == NULL )
|
|
return NULL;
|
|
|
|
p_sys = p_sd->p_sys;
|
|
|
|
p_sap->i_last = mdate();
|
|
p_sap->i_period = 0;
|
|
p_sap->i_period_trust = 0;
|
|
p_sap->i_hash = i_hash;
|
|
memcpy (p_sap->i_source, i_source, sizeof(p_sap->i_source));
|
|
p_sap->p_sdp = p_sdp;
|
|
|
|
/* Released in RemoveAnnounce */
|
|
p_input = input_item_NewWithType( p_sap->p_sdp->psz_uri,
|
|
p_sdp->psz_sessionname,
|
|
0, NULL, 0, -1, ITEM_TYPE_NET );
|
|
p_sap->p_item = p_input;
|
|
if( !p_input )
|
|
{
|
|
free( p_sap );
|
|
return NULL;
|
|
}
|
|
|
|
if( p_sdp->rtcp_port )
|
|
{
|
|
char *rtcp;
|
|
if( asprintf( &rtcp, ":rtcp-port=%u", p_sdp->rtcp_port ) != -1 )
|
|
{
|
|
input_item_AddOption( p_input, rtcp, VLC_INPUT_OPTION_TRUSTED );
|
|
free( rtcp );
|
|
}
|
|
}
|
|
|
|
psz_value = GetAttribute( p_sap->p_sdp->pp_attributes, p_sap->p_sdp->i_attributes, "tool" );
|
|
if( psz_value != NULL )
|
|
{
|
|
input_item_AddInfo( p_input, _("Session"), _("Tool"), "%s", psz_value );
|
|
}
|
|
if( strcmp( p_sdp->username, "-" ) )
|
|
{
|
|
input_item_AddInfo( p_input, _("Session"), _("User"), "%s",
|
|
p_sdp->username );
|
|
}
|
|
|
|
/* Handle category */
|
|
psz_value = GetAttribute(p_sap->p_sdp->pp_attributes,
|
|
p_sap->p_sdp->i_attributes, "cat");
|
|
if (psz_value != NULL)
|
|
{
|
|
/* a=cat provides a dot-separated hierarchy.
|
|
* For the time being only replace dots with pipe. TODO: FIXME */
|
|
char *str = strdup(psz_value);
|
|
if (likely(str != NULL))
|
|
for (char *p = strchr(str, '.'); p != NULL; p = strchr(p, '.'))
|
|
*(p++) = '|';
|
|
services_discovery_AddItem(p_sd, p_input, str ? str : psz_value);
|
|
free(str);
|
|
}
|
|
else
|
|
{
|
|
/* backward compatibility with VLC 0.7.3-2.0.0 senders */
|
|
psz_value = GetAttribute(p_sap->p_sdp->pp_attributes,
|
|
p_sap->p_sdp->i_attributes, "x-plgroup");
|
|
services_discovery_AddItem(p_sd, p_input, psz_value);
|
|
}
|
|
|
|
TAB_APPEND( p_sys->i_announces, p_sys->pp_announces, p_sap );
|
|
|
|
return p_sap;
|
|
}
|
|
|
|
|
|
static const char *FindAttribute (const sdp_t *sdp, unsigned media,
|
|
const char *name)
|
|
{
|
|
/* Look for media attribute, and fallback to session */
|
|
const char *attr = GetAttribute (sdp->mediav[media].pp_attributes,
|
|
sdp->mediav[media].i_attributes, name);
|
|
if (attr == NULL)
|
|
attr = GetAttribute (sdp->pp_attributes, sdp->i_attributes, name);
|
|
return attr;
|
|
}
|
|
|
|
|
|
/* Fill p_sdp->psz_uri */
|
|
static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
|
|
{
|
|
if (p_sdp->mediac == 0)
|
|
{
|
|
msg_Dbg (p_obj, "Ignoring SDP with no media");
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
for (unsigned i = 1; i < p_sdp->mediac; i++)
|
|
{
|
|
if ((p_sdp->mediav[i].n_addr != p_sdp->mediav->n_addr)
|
|
|| (p_sdp->mediav[i].addrlen != p_sdp->mediav->addrlen)
|
|
|| memcmp (&p_sdp->mediav[i].addr, &p_sdp->mediav->addr,
|
|
p_sdp->mediav->addrlen))
|
|
{
|
|
msg_Dbg (p_obj, "Multiple media ports not supported -> live555");
|
|
return VLC_EGENERIC;
|
|
}
|
|
}
|
|
|
|
if (p_sdp->mediav->n_addr != 1)
|
|
{
|
|
msg_Dbg (p_obj, "Layered encoding not supported -> live555");
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
char psz_uri[1026];
|
|
const char *host;
|
|
int port;
|
|
|
|
psz_uri[0] = '[';
|
|
if (vlc_getnameinfo ((struct sockaddr *)&(p_sdp->mediav->addr),
|
|
p_sdp->mediav->addrlen, psz_uri + 1,
|
|
sizeof (psz_uri) - 2, &port, NI_NUMERICHOST))
|
|
return VLC_EGENERIC;
|
|
|
|
if (strchr (psz_uri + 1, ':'))
|
|
{
|
|
host = psz_uri;
|
|
strcat (psz_uri, "]");
|
|
}
|
|
else
|
|
host = psz_uri + 1;
|
|
|
|
/* Parse m= field */
|
|
char *sdp_proto = strdup (p_sdp->mediav[0].fmt);
|
|
if (sdp_proto == NULL)
|
|
return VLC_ENOMEM;
|
|
|
|
char *subtype = strchr (sdp_proto, ' ');
|
|
if (subtype == NULL)
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP media subtype: %s", sdp_proto);
|
|
free (sdp_proto);
|
|
return VLC_EGENERIC;
|
|
}
|
|
else
|
|
{
|
|
*subtype++ = '\0';
|
|
/* FIXME: check for multiple payload types in RTP/AVP case.
|
|
* FIXME: check for "mpeg" subtype in raw udp case. */
|
|
if (!strcasecmp (sdp_proto, "udp"))
|
|
p_sdp->i_media_type = 33;
|
|
else
|
|
p_sdp->i_media_type = atoi (subtype);
|
|
}
|
|
|
|
/* RTP protocol, nul, VLC shortcut, nul, flags byte as follow:
|
|
* 0x1: Connection-Oriented media. */
|
|
static const char proto_match[] =
|
|
"udp\0" "udp\0\0"
|
|
"RTP/AVP\0" "rtp\0\0"
|
|
"UDPLite/RTP/AVP\0" "udplite\0\0"
|
|
"DCCP/RTP/AVP\0" "dccp\0\1"
|
|
"TCP/RTP/AVP\0" "rtptcp\0\1"
|
|
"\0";
|
|
|
|
const char *vlc_proto = NULL;
|
|
uint8_t flags = 0;
|
|
for (const char *proto = proto_match; *proto;)
|
|
{
|
|
if (strcasecmp (proto, sdp_proto) == 0)
|
|
{
|
|
vlc_proto = proto + strlen (proto) + 1;
|
|
flags = vlc_proto[strlen (vlc_proto) + 1];
|
|
break;
|
|
}
|
|
proto += strlen (proto) + 1;
|
|
proto += strlen (proto) + 2;
|
|
}
|
|
|
|
free (sdp_proto);
|
|
if (vlc_proto == NULL)
|
|
{
|
|
msg_Dbg (p_obj, "unknown SDP media protocol: %s",
|
|
p_sdp->mediav[0].fmt);
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
if (!strcmp (vlc_proto, "udp") || FindAttribute (p_sdp, 0, "rtcp-mux"))
|
|
p_sdp->rtcp_port = 0;
|
|
else
|
|
{
|
|
const char *rtcp = FindAttribute (p_sdp, 0, "rtcp");
|
|
if (rtcp)
|
|
p_sdp->rtcp_port = atoi (rtcp);
|
|
else
|
|
if (port & 1) /* odd port -> RTCP; next even port -> RTP */
|
|
p_sdp->rtcp_port = port++;
|
|
else /* even port -> RTP; next odd port -> RTCP */
|
|
p_sdp->rtcp_port = port + 1;
|
|
}
|
|
|
|
if (flags & 1)
|
|
{
|
|
/* Connection-oriented media */
|
|
const char *setup = FindAttribute (p_sdp, 0, "setup");
|
|
if (setup == NULL)
|
|
setup = "active"; /* default value */
|
|
|
|
if (strcmp (setup, "actpass") && strcmp (setup, "passive"))
|
|
{
|
|
msg_Dbg (p_obj, "unsupported COMEDIA mode: %s", setup);
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
if (asprintf (&p_sdp->psz_uri, "%s://%s:%d", vlc_proto,
|
|
host, port) == -1)
|
|
return VLC_ENOMEM;
|
|
}
|
|
else
|
|
{
|
|
/* Non-connected (normally multicast) media */
|
|
char psz_source[258] = "";
|
|
const char *sfilter = FindAttribute (p_sdp, 0, "source-filter");
|
|
if (sfilter != NULL)
|
|
{
|
|
char psz_source_ip[256];
|
|
unsigned ipv;
|
|
|
|
if (sscanf (sfilter, " incl IN IP%u %*s %255s ", &ipv,
|
|
psz_source_ip) == 2)
|
|
{
|
|
/* According to RFC4570, FQDNs can be used for source-filters,
|
|
* but -seriously- this is impractical */
|
|
switch (ipv)
|
|
{
|
|
#ifdef AF_INET6
|
|
case 6:
|
|
{
|
|
struct in6_addr addr;
|
|
if ((inet_pton (AF_INET6, psz_source_ip, &addr) > 0)
|
|
&& (inet_ntop (AF_INET6, &addr, psz_source + 1,
|
|
sizeof (psz_source) - 2) != NULL))
|
|
{
|
|
psz_source[0] = '[';
|
|
psz_source[strlen (psz_source)] = ']';
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
case 4:
|
|
{
|
|
struct in_addr addr;
|
|
if ((inet_pton (AF_INET, psz_source_ip, &addr) > 0)
|
|
&& (inet_ntop (AF_INET, &addr, psz_source,
|
|
sizeof (psz_source)) == NULL))
|
|
*psz_source = '\0';
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (asprintf (&p_sdp->psz_uri, "%s://%s@%s:%i", vlc_proto, psz_source,
|
|
host, port) == -1)
|
|
return VLC_ENOMEM;
|
|
}
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
|
|
static int ParseSDPConnection (const char *str, struct sockaddr_storage *addr,
|
|
socklen_t *addrlen, unsigned *number)
|
|
{
|
|
char host[60];
|
|
unsigned fam, n1, n2;
|
|
|
|
int res = sscanf (str, "IN IP%u %59[^/]/%u/%u", &fam, host, &n1, &n2);
|
|
if (res < 2)
|
|
return -1;
|
|
|
|
switch (fam)
|
|
{
|
|
#ifdef AF_INET6
|
|
case 6:
|
|
addr->ss_family = AF_INET6;
|
|
# ifdef HAVE_SA_LEN
|
|
addr->ss_len =
|
|
# endif
|
|
*addrlen = sizeof (struct sockaddr_in6);
|
|
|
|
if (inet_pton (AF_INET6, host,
|
|
&((struct sockaddr_in6 *)addr)->sin6_addr) <= 0)
|
|
return -1;
|
|
|
|
*number = (res >= 3) ? n1 : 1;
|
|
break;
|
|
#endif
|
|
|
|
case 4:
|
|
addr->ss_family = AF_INET;
|
|
# ifdef HAVE_SA_LEN
|
|
addr->ss_len =
|
|
# endif
|
|
*addrlen = sizeof (struct sockaddr_in);
|
|
|
|
if (inet_pton (AF_INET, host,
|
|
&((struct sockaddr_in *)addr)->sin_addr) <= 0)
|
|
return -1;
|
|
|
|
*number = (res >= 4) ? n2 : 1;
|
|
break;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* ParseSDP : SDP parsing
|
|
* *********************************************************************
|
|
* Validate SDP and parse all fields
|
|
***********************************************************************/
|
|
static sdp_t *ParseSDP (vlc_object_t *p_obj, const char *psz_sdp)
|
|
{
|
|
if( psz_sdp == NULL )
|
|
return NULL;
|
|
|
|
sdp_t *p_sdp = calloc (1, sizeof (*p_sdp));
|
|
if (p_sdp == NULL)
|
|
return NULL;
|
|
|
|
char expect = 'V';
|
|
struct sockaddr_storage glob_addr;
|
|
memset (&glob_addr, 0, sizeof (glob_addr));
|
|
socklen_t glob_len = 0;
|
|
unsigned glob_count = 1;
|
|
int port = 0;
|
|
|
|
/* TODO: use iconv and charset attribute instead of EnsureUTF8 */
|
|
while (*psz_sdp)
|
|
{
|
|
/* Extract one line */
|
|
char *eol = strchr (psz_sdp, '\n');
|
|
size_t linelen = eol ? (size_t)(eol - psz_sdp) : strlen (psz_sdp);
|
|
char line[linelen + 1];
|
|
memcpy (line, psz_sdp, linelen);
|
|
line[linelen] = '\0';
|
|
|
|
psz_sdp += linelen + 1;
|
|
|
|
/* Remove carriage return if present */
|
|
eol = strchr (line, '\r');
|
|
if (eol != NULL)
|
|
{
|
|
linelen = eol - line;
|
|
line[linelen] = '\0';
|
|
}
|
|
|
|
/* Validate line */
|
|
char cat = line[0], *data = line + 2;
|
|
if (!cat || (strchr ("vosiuepcbtrzkam", cat) == NULL))
|
|
{
|
|
/* MUST ignore SDP with unknown line type */
|
|
msg_Dbg (p_obj, "unknown SDP line type: 0x%02x", (int)cat);
|
|
goto error;
|
|
}
|
|
if (line[1] != '=')
|
|
{
|
|
msg_Dbg (p_obj, "invalid SDP line: %s", line);
|
|
goto error;
|
|
}
|
|
|
|
assert (linelen >= 2);
|
|
|
|
/* SDP parsing state machine
|
|
* We INTERNALLY use uppercase for session, lowercase for media
|
|
*/
|
|
switch (expect)
|
|
{
|
|
/* Session description */
|
|
case 'V':
|
|
expect = 'O';
|
|
if (cat != 'v')
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP version");
|
|
goto error;
|
|
}
|
|
if (strcmp (data, "0"))
|
|
{
|
|
msg_Dbg (p_obj, "unknown SDP version: %s", data);
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'O':
|
|
{
|
|
expect = 'S';
|
|
if (cat != 'o')
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP originator");
|
|
goto error;
|
|
}
|
|
|
|
if ((sscanf (data, "%63s %"SCNu64" %"SCNu64" IN IP%u %1023s",
|
|
p_sdp->username, &p_sdp->session_id,
|
|
&p_sdp->session_version, &p_sdp->orig_ip_version,
|
|
p_sdp->orig_host) != 5)
|
|
|| ((p_sdp->orig_ip_version != 4)
|
|
&& (p_sdp->orig_ip_version != 6)))
|
|
{
|
|
msg_Dbg (p_obj, "SDP origin not supported: %s", data);
|
|
/* Or maybe out-of-range, but this looks suspicious */
|
|
return NULL;
|
|
}
|
|
EnsureUTF8 (p_sdp->orig_host);
|
|
break;
|
|
}
|
|
|
|
case 'S':
|
|
{
|
|
expect = 'I';
|
|
if ((cat != 's') || !*data)
|
|
{
|
|
/* MUST be present AND non-empty */
|
|
msg_Dbg (p_obj, "missing SDP session name");
|
|
goto error;
|
|
}
|
|
assert (p_sdp->psz_sessionname == NULL); // no memleak here
|
|
p_sdp->psz_sessionname = strdup (data);
|
|
if (p_sdp->psz_sessionname == NULL)
|
|
goto error;
|
|
EnsureUTF8 (p_sdp->psz_sessionname);
|
|
break;
|
|
}
|
|
|
|
case 'I':
|
|
expect = 'U';
|
|
if (cat == 'i')
|
|
break;
|
|
case 'U':
|
|
expect = 'E';
|
|
if (cat == 'u')
|
|
break;
|
|
case 'E':
|
|
expect = 'E';
|
|
if (cat == 'e')
|
|
break;
|
|
case 'P':
|
|
expect = 'P';
|
|
if (cat == 'p')
|
|
break;
|
|
case 'C':
|
|
expect = 'B';
|
|
if (cat == 'c')
|
|
{
|
|
if (ParseSDPConnection (data, &glob_addr, &glob_len,
|
|
&glob_count))
|
|
{
|
|
msg_Dbg (p_obj, "SDP connection infos not supported: "
|
|
"%s", data);
|
|
goto error;
|
|
}
|
|
break;
|
|
}
|
|
case 'B':
|
|
assert (expect == 'B');
|
|
if (cat == 'b')
|
|
break;
|
|
case 'T':
|
|
expect = 'R';
|
|
if (cat != 't')
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP time description");
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
case 'R':
|
|
if ((cat == 't') || (cat == 'r'))
|
|
break;
|
|
|
|
case 'Z':
|
|
expect = 'K';
|
|
if (cat == 'z')
|
|
break;
|
|
case 'K':
|
|
expect = 'A';
|
|
if (cat == 'k')
|
|
break;
|
|
case 'A':
|
|
//expect = 'A';
|
|
if (cat == 'a')
|
|
{
|
|
attribute_t *p_attr = MakeAttribute (data);
|
|
TAB_APPEND( p_sdp->i_attributes, p_sdp->pp_attributes, p_attr );
|
|
break;
|
|
}
|
|
|
|
/* Media description */
|
|
case 'm':
|
|
media:
|
|
{
|
|
expect = 'i';
|
|
if (cat != 'm')
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP media description");
|
|
goto error;
|
|
}
|
|
struct sdp_media_t *m;
|
|
m = realloc (p_sdp->mediav, (p_sdp->mediac + 1) * sizeof (*m));
|
|
if (m == NULL)
|
|
goto error;
|
|
|
|
p_sdp->mediav = m;
|
|
m += p_sdp->mediac;
|
|
p_sdp->mediac++;
|
|
|
|
memset (m, 0, sizeof (*m));
|
|
memcpy (&m->addr, &glob_addr, m->addrlen = glob_len);
|
|
m->n_addr = glob_count;
|
|
|
|
/* TODO: remember media type (if we need multiple medias) */
|
|
data = strchr (data, ' ');
|
|
if (data == NULL)
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP media port");
|
|
goto error;
|
|
}
|
|
port = atoi (++data);
|
|
if (port <= 0 || port >= 65536)
|
|
{
|
|
msg_Dbg (p_obj, "invalid transport port %d", port);
|
|
goto error;
|
|
}
|
|
net_SetPort ((struct sockaddr *)&m->addr, htons (port));
|
|
|
|
data = strchr (data, ' ');
|
|
if (data == NULL)
|
|
{
|
|
msg_Dbg (p_obj, "missing SDP media format");
|
|
goto error;
|
|
}
|
|
m->fmt = strdup (++data);
|
|
if (m->fmt == NULL)
|
|
goto error;
|
|
|
|
break;
|
|
}
|
|
case 'i':
|
|
expect = 'c';
|
|
if (cat == 'i')
|
|
break;
|
|
case 'c':
|
|
expect = 'b';
|
|
if (cat == 'c')
|
|
{
|
|
struct sdp_media_t *m = p_sdp->mediav + p_sdp->mediac - 1;
|
|
if (ParseSDPConnection (data, &m->addr, &m->addrlen,
|
|
&m->n_addr))
|
|
{
|
|
msg_Dbg (p_obj, "SDP connection infos not supported: "
|
|
"%s", data);
|
|
goto error;
|
|
}
|
|
net_SetPort ((struct sockaddr *)&m->addr, htons (port));
|
|
break;
|
|
}
|
|
case 'b':
|
|
expect = 'b';
|
|
if (cat == 'b')
|
|
break;
|
|
case 'k':
|
|
expect = 'a';
|
|
if (cat == 'k')
|
|
break;
|
|
case 'a':
|
|
assert (expect == 'a');
|
|
if (cat == 'a')
|
|
{
|
|
attribute_t *p_attr = MakeAttribute (data);
|
|
if (p_attr == NULL)
|
|
goto error;
|
|
|
|
TAB_APPEND (p_sdp->mediav[p_sdp->mediac - 1].i_attributes,
|
|
p_sdp->mediav[p_sdp->mediac - 1].pp_attributes, p_attr);
|
|
break;
|
|
}
|
|
|
|
if (cat == 'm')
|
|
goto media;
|
|
|
|
if (cat != 'm')
|
|
{
|
|
msg_Dbg (p_obj, "unexpected SDP line: 0x%02x", (int)cat);
|
|
goto error;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
msg_Err (p_obj, "*** BUG in SDP parser! ***");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
return p_sdp;
|
|
|
|
error:
|
|
FreeSDP (p_sdp);
|
|
return NULL;
|
|
}
|
|
|
|
static int InitSocket( services_discovery_t *p_sd, const char *psz_address,
|
|
int i_port )
|
|
{
|
|
int i_fd = net_ListenUDP1 ((vlc_object_t *)p_sd, psz_address, i_port);
|
|
if (i_fd == -1)
|
|
return VLC_EGENERIC;
|
|
|
|
shutdown( i_fd, SHUT_WR );
|
|
INSERT_ELEM (p_sd->p_sys->pi_fd, p_sd->p_sys->i_fd,
|
|
p_sd->p_sys->i_fd, i_fd);
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int Decompress( const unsigned char *psz_src, unsigned char **_dst, int i_len )
|
|
{
|
|
#ifdef HAVE_ZLIB_H
|
|
int i_result, i_dstsize, n = 0;
|
|
unsigned char *psz_dst = NULL;
|
|
z_stream d_stream;
|
|
|
|
memset (&d_stream, 0, sizeof (d_stream));
|
|
|
|
i_result = inflateInit(&d_stream);
|
|
if( i_result != Z_OK )
|
|
return( -1 );
|
|
|
|
d_stream.next_in = (Bytef *)psz_src;
|
|
d_stream.avail_in = i_len;
|
|
|
|
do
|
|
{
|
|
n++;
|
|
psz_dst = (unsigned char *)realloc( psz_dst, n * 1000 );
|
|
d_stream.next_out = (Bytef *)&psz_dst[(n - 1) * 1000];
|
|
d_stream.avail_out = 1000;
|
|
|
|
i_result = inflate(&d_stream, Z_NO_FLUSH);
|
|
if( ( i_result != Z_OK ) && ( i_result != Z_STREAM_END ) )
|
|
{
|
|
inflateEnd( &d_stream );
|
|
free( psz_dst );
|
|
return( -1 );
|
|
}
|
|
}
|
|
while( ( d_stream.avail_out == 0 ) && ( d_stream.avail_in != 0 ) &&
|
|
( i_result != Z_STREAM_END ) );
|
|
|
|
i_dstsize = d_stream.total_out;
|
|
inflateEnd( &d_stream );
|
|
|
|
*_dst = (unsigned char *)realloc( psz_dst, i_dstsize );
|
|
|
|
return i_dstsize;
|
|
#else
|
|
(void)psz_src;
|
|
(void)_dst;
|
|
(void)i_len;
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
|
|
static void FreeSDP( sdp_t *p_sdp )
|
|
{
|
|
free( p_sdp->psz_sessionname );
|
|
free( p_sdp->psz_uri );
|
|
|
|
for (unsigned j = 0; j < p_sdp->mediac; j++)
|
|
{
|
|
free (p_sdp->mediav[j].fmt);
|
|
for (int i = 0; i < p_sdp->mediav[j].i_attributes; i++)
|
|
FreeAttribute (p_sdp->mediav[j].pp_attributes[i]);
|
|
free (p_sdp->mediav[j].pp_attributes);
|
|
}
|
|
free (p_sdp->mediav);
|
|
|
|
for (int i = 0; i < p_sdp->i_attributes; i++)
|
|
FreeAttribute (p_sdp->pp_attributes[i]);
|
|
|
|
free (p_sdp->pp_attributes);
|
|
free (p_sdp);
|
|
}
|
|
|
|
static int RemoveAnnounce( services_discovery_t *p_sd,
|
|
sap_announce_t *p_announce )
|
|
{
|
|
int i;
|
|
|
|
if( p_announce->p_sdp )
|
|
{
|
|
FreeSDP( p_announce->p_sdp );
|
|
p_announce->p_sdp = NULL;
|
|
}
|
|
|
|
if( p_announce->p_item )
|
|
{
|
|
services_discovery_RemoveItem( p_sd, p_announce->p_item );
|
|
vlc_gc_decref( p_announce->p_item );
|
|
p_announce->p_item = NULL;
|
|
}
|
|
|
|
for( i = 0; i< p_sd->p_sys->i_announces; i++)
|
|
{
|
|
if( p_sd->p_sys->pp_announces[i] == p_announce )
|
|
{
|
|
REMOVE_ELEM( p_sd->p_sys->pp_announces, p_sd->p_sys->i_announces,
|
|
i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
free( p_announce );
|
|
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Compare two sessions, when hash is not set (SAP v0)
|
|
*/
|
|
static bool IsSameSession( sdp_t *p_sdp1, sdp_t *p_sdp2 )
|
|
{
|
|
/* A session is identified by
|
|
* - username,
|
|
* - session_id,
|
|
* - network type (which is always IN),
|
|
* - address type (currently, this means IP version),
|
|
* - and hostname.
|
|
*/
|
|
if (strcmp (p_sdp1->username, p_sdp2->username)
|
|
|| (p_sdp1->session_id != p_sdp2->session_id)
|
|
|| (p_sdp1->orig_ip_version != p_sdp2->orig_ip_version)
|
|
|| strcmp (p_sdp1->orig_host, p_sdp2->orig_host))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline attribute_t *MakeAttribute (const char *str)
|
|
{
|
|
attribute_t *a = malloc (sizeof (*a) + strlen (str) + 1);
|
|
if (a == NULL)
|
|
return NULL;
|
|
|
|
strcpy (a->name, str);
|
|
EnsureUTF8 (a->name);
|
|
char *value = strchr (a->name, ':');
|
|
if (value != NULL)
|
|
{
|
|
*value++ = '\0';
|
|
a->value = value;
|
|
}
|
|
else
|
|
a->value = "";
|
|
return a;
|
|
}
|
|
|
|
|
|
static const char *GetAttribute (attribute_t **tab, unsigned n,
|
|
const char *name)
|
|
{
|
|
for (unsigned i = 0; i < n; i++)
|
|
if (strcasecmp (tab[i]->name, name) == 0)
|
|
return tab[i]->value;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static inline void FreeAttribute (attribute_t *a)
|
|
{
|
|
free (a);
|
|
}
|
|
|