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vlc/modules/services_discovery/microdns.c

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/*****************************************************************************
* microdns.c: mDNS services discovery module
*****************************************************************************
* Copyright © 2016 VLC authors, VideoLAN and VideoLabs
*
* Authors: Steve Lhomme <robux4@videolabs.io>
* Thomas Guillem <thomas@gllm.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdatomic.h>
#include <assert.h>
#include <vlc_common.h>
#include <vlc_arrays.h>
#include <vlc_configuration.h>
#include <vlc_plugin.h>
#include <vlc_modules.h>
#include <vlc_services_discovery.h>
#include <vlc_renderer_discovery.h>
#include <microdns/microdns.h>
static int OpenSD( vlc_object_t * );
static void CloseSD( vlc_object_t * );
static int OpenRD( vlc_object_t * );
static void CloseRD( vlc_object_t * );
VLC_SD_PROBE_HELPER( "microdns", N_("mDNS Network Discovery"), SD_CAT_LAN )
VLC_RD_PROBE_HELPER( "microdns_renderer", "mDNS renderer Discovery" )
#define CFG_PREFIX "sd-microdns-"
#define LISTEN_INTERVAL VLC_TICK_FROM_SEC(15) /* 15 seconds */
#define TIMEOUT (3 * LISTEN_INTERVAL + VLC_TICK_FROM_SEC(5)) /* 3 * interval + 5 seconds */
/*
* Module descriptor
*/
vlc_module_begin()
set_shortname( "mDNS" )
set_description( N_( "mDNS Network Discovery" ) )
set_subcategory( SUBCAT_PLAYLIST_SD )
set_capability( "services_discovery", 0 )
set_callbacks( OpenSD, CloseSD )
add_shortcut( "mdns", "microdns" )
VLC_SD_PROBE_SUBMODULE
add_submodule() \
set_description( N_( "mDNS Renderer Discovery" ) )
set_subcategory( SUBCAT_SOUT_RENDERER )
set_capability( "renderer_discovery", 0 )
set_callbacks( OpenRD, CloseRD )
add_shortcut( "mdns_renderer", "microdns_renderer" )
VLC_RD_PROBE_SUBMODULE
vlc_module_end ()
static const struct
{
const char *psz_protocol;
const char *psz_service_name;
bool b_renderer;
int i_renderer_flags;
} protocols[] = {
{ "ftp", "_ftp._tcp.local", false, 0 },
{ "smb", "_smb._tcp.local", false, 0 },
{ "nfs", "_nfs._tcp.local", false, 0 },
{ "sftp", "_sftp-ssh._tcp.local", false, 0 },
{ "rtsp", "_rtsp._tcp.local", false, 0 },
{ "chromecast", "_googlecast._tcp.local", true, VLC_RENDERER_CAN_AUDIO },
};
#define NB_PROTOCOLS (sizeof(protocols) / sizeof(*protocols))
struct discovery_sys
{
vlc_thread_t thread;
atomic_bool stop;
struct mdns_ctx * p_microdns;
const char * ppsz_service_names[NB_PROTOCOLS];
unsigned int i_nb_service_names;
vlc_array_t items;
};
struct item
{
char * psz_uri;
input_item_t * p_input_item;
vlc_renderer_item_t*p_renderer_item;
vlc_tick_t i_last_seen;
};
struct srv
{
const char *psz_protocol;
char * psz_device_name;
uint16_t i_port;
struct
{
char * psz_model;
char * psz_icon;
int i_renderer_flags;
} renderer;
};
static const char *const ppsz_options[] = {
NULL
};
static void
print_error( vlc_object_t *p_obj, const char *psz_what, int i_status )
{
char psz_err_str[128];
if( mdns_strerror( i_status, psz_err_str, sizeof(psz_err_str) ) == 0)
msg_Err( p_obj, "mDNS %s error: %s", psz_what, psz_err_str);
else
msg_Err( p_obj, "mDNS %s error: unknown: %d", psz_what, i_status);
}
static int
strrcmp(const char *s1, const char *s2)
{
size_t m, n;
m = strlen(s1);
n = strlen(s2);
if (n > m)
return 1;
return strncmp(s1 + m - n, s2, n);
}
static int
items_add_input( struct discovery_sys *p_sys, services_discovery_t *p_sd,
char *psz_uri, const char *psz_name )
{
struct item *p_item = malloc( sizeof(struct item) );
if( p_item == NULL )
{
free( psz_uri );
return VLC_ENOMEM;
}
input_item_t *p_input_item =
input_item_NewDirectory( psz_uri, psz_name, ITEM_NET );
if( p_input_item == NULL )
{
free( psz_uri );
free( p_item );
return VLC_ENOMEM;
}
p_item->psz_uri = psz_uri;
p_item->p_input_item = p_input_item;
p_item->p_renderer_item = NULL;
p_item->i_last_seen = vlc_tick_now();
vlc_array_append_or_abort( &p_sys->items, p_item );
services_discovery_AddItem( p_sd, p_input_item );
return VLC_SUCCESS;
}
static int
items_add_renderer( struct discovery_sys *p_sys, vlc_renderer_discovery_t *p_rd,
const char *psz_name, char *psz_uri,
const char *psz_demux_filter, const char *psz_icon_uri,
int i_flags )
{
struct item *p_item = malloc( sizeof(struct item) );
if( p_item == NULL )
return VLC_ENOMEM;
const char *psz_extra_uri = i_flags & VLC_RENDERER_CAN_VIDEO ? NULL : "no-video";
vlc_renderer_item_t *p_renderer_item =
vlc_renderer_item_new( "chromecast", psz_name, psz_uri, psz_extra_uri,
psz_demux_filter, psz_icon_uri, i_flags );
if( p_renderer_item == NULL )
{
free( psz_uri );
free( p_item );
return VLC_ENOMEM;
}
p_item->psz_uri = psz_uri;
p_item->p_input_item = NULL;
p_item->p_renderer_item = p_renderer_item;
p_item->i_last_seen = vlc_tick_now();
vlc_array_append_or_abort( &p_sys->items, p_item );
vlc_rd_add_item( p_rd, p_renderer_item );
return VLC_SUCCESS;
}
static void
items_release( struct discovery_sys *p_sys, struct item *p_item )
{
(void) p_sys;
if( p_item->p_input_item != NULL )
{
input_item_Release( p_item->p_input_item );
}
else
{
assert( p_item->p_renderer_item != NULL );
vlc_renderer_item_release( p_item->p_renderer_item );
}
free( p_item->psz_uri );
free( p_item );
}
static bool
items_exists( struct discovery_sys *p_sys, const char *psz_uri )
{
for( size_t i = 0; i < vlc_array_count( &p_sys->items ); ++i )
{
struct item *p_item = vlc_array_item_at_index( &p_sys->items, i );
if( strcmp( p_item->psz_uri, psz_uri ) == 0 )
{
p_item->i_last_seen = vlc_tick_now();
return true;
}
}
return false;
}
static void
items_timeout( struct discovery_sys *p_sys, services_discovery_t *p_sd,
vlc_renderer_discovery_t *p_rd )
{
assert( p_rd != NULL || p_sd != NULL );
vlc_tick_t i_now = vlc_tick_now();
/* Remove items that are not seen since TIMEOUT */
for( size_t i = 0; i < vlc_array_count( &p_sys->items ); ++i )
{
struct item *p_item = vlc_array_item_at_index( &p_sys->items, i );
if( i_now - p_item->i_last_seen > TIMEOUT )
{
if( p_sd != NULL )
services_discovery_RemoveItem( p_sd, p_item->p_input_item );
else
vlc_rd_remove_item( p_rd, p_item->p_renderer_item );
items_release( p_sys, p_item );
vlc_array_remove( &p_sys->items, i-- );
}
}
}
static void
items_clear( struct discovery_sys *p_sys )
{
for( size_t i = 0; i < vlc_array_count( &p_sys->items ); ++i )
{
struct item *p_item = vlc_array_item_at_index( &p_sys->items, i );
items_release( p_sys, p_item );
}
vlc_array_clear( &p_sys->items );
}
static void clear_srvs( struct srv *p_srvs, unsigned int i_nb_srv )
{
for( unsigned int i = 0; i < i_nb_srv; ++i )
{
free( p_srvs[i].psz_device_name );
free( p_srvs[i].renderer.psz_model);
free( p_srvs[i].renderer.psz_icon );
}
free( p_srvs );
}
static int
parse_entries( const struct rr_entry *p_entries, bool b_renderer,
struct srv **pp_srvs, unsigned int *p_nb_srv,
const char **ppsz_ip, bool *p_ipv6 )
{
/* Count the number of servers */
unsigned int i_nb_srv = 0;
for( const struct rr_entry *p_entry = p_entries;
p_entry != NULL; p_entry = p_entry->next )
{
if( p_entry->type == RR_SRV )
i_nb_srv++;
}
if( i_nb_srv == 0 )
return VLC_EGENERIC;
struct srv *p_srvs = calloc(i_nb_srv, sizeof(struct srv));
if( p_srvs == NULL )
return VLC_EGENERIC;
/* There is one ip for several srvs, fetch them */
const char *psz_ip = NULL;
struct srv *p_srv = NULL;
i_nb_srv = 0;
for( const struct rr_entry *p_entry = p_entries;
p_entry != NULL; p_entry = p_entry->next )
{
if( p_entry->type == RR_SRV )
{
for( unsigned i = 0; i < NB_PROTOCOLS; ++i )
{
if( !strrcmp( p_entry->name, protocols[i].psz_service_name ) &&
protocols[i].b_renderer == b_renderer )
{
p_srv = &p_srvs[i_nb_srv];
p_srv->psz_device_name =
strndup( p_entry->name, strlen( p_entry->name )
- strlen( protocols[i].psz_service_name ) - 1);
if( p_srv->psz_device_name == NULL )
break;
p_srv->psz_protocol = protocols[i].psz_protocol;
p_srv->i_port = p_entry->data.SRV.port;
p_srv->renderer.i_renderer_flags = protocols[i].i_renderer_flags;
++i_nb_srv;
break;
}
}
}
else if( p_entry->type == RR_A && psz_ip == NULL )
psz_ip = p_entry->data.A.addr_str;
else if( p_entry->type == RR_AAAA && psz_ip == NULL )
{
psz_ip = p_entry->data.AAAA.addr_str;
*p_ipv6 = true;
}
else if( p_entry->type == RR_TXT && p_srv != NULL )
{
for ( struct rr_data_txt *p_txt = p_entry->data.TXT;
p_txt != NULL ; p_txt = p_txt->next )
{
if( !strcmp( p_srv->psz_protocol, "chromecast" ) )
{
if ( !strncmp( "fn=", p_txt->txt, 3 ) )
{
free( p_srv->psz_device_name );
p_srv->psz_device_name = strdup( p_txt->txt + 3 );
}
else if( !strncmp( "ca=", p_txt->txt, 3 ) )
{
int ca = atoi( p_txt->txt + 3);
/*
* For chromecast, the `ca=` is composed from (at least)
* 0x01 to indicate video support
* 0x04 to indivate audio support
*/
if ( ( ca & 0x01 ) != 0 )
p_srv->renderer.i_renderer_flags |= VLC_RENDERER_CAN_VIDEO;
if ( ( ca & 0x04 ) != 0 )
p_srv->renderer.i_renderer_flags |= VLC_RENDERER_CAN_AUDIO;
}
else if( !strncmp("md=", p_txt->txt, 3) )
{
free( p_srv->renderer.psz_model );
p_srv->renderer.psz_model = strdup( p_txt->txt + 3 );
}
else if( !strncmp("ic=", p_txt->txt, 3) )
{
free( p_srv->renderer.psz_icon );
p_srv->renderer.psz_icon = strdup( p_txt->txt + 3 );
}
}
}
}
}
if( psz_ip == NULL || i_nb_srv == 0 )
{
clear_srvs( p_srvs, i_nb_srv );
return VLC_EGENERIC;
}
*pp_srvs = p_srvs;
*p_nb_srv = i_nb_srv;
*ppsz_ip = psz_ip;
return VLC_SUCCESS;
}
static char *
create_uri( const char *psz_protocol, const char *psz_ip, bool b_ipv6,
uint16_t i_port )
{
char *psz_uri;
return asprintf( &psz_uri, "%s://%s%s%s:%u", psz_protocol,
b_ipv6 ? "[" : "", psz_ip, b_ipv6 ? "]" : "",
i_port ) < 0 ? NULL : psz_uri;
}
static void
new_entries_sd_cb( void *p_this, int i_status, const struct rr_entry *p_entries )
{
services_discovery_t *p_sd = (services_discovery_t *)p_this;
struct discovery_sys *p_sys = p_sd->p_sys;
if( i_status < 0 )
{
print_error( VLC_OBJECT( p_sd ), "entry callback", i_status );
return;
}
struct srv *p_srvs;
unsigned i_nb_srv;
const char *psz_ip;
bool b_ipv6 = false;
if( parse_entries( p_entries, false, &p_srvs, &i_nb_srv,
&psz_ip, &b_ipv6 ) != VLC_SUCCESS )
return;
/* send new input items (if they don't already exist) */
for( unsigned int i = 0; i < i_nb_srv; ++i )
{
struct srv *p_srv = &p_srvs[i];
char *psz_uri = create_uri( p_srv->psz_protocol, psz_ip, b_ipv6,
p_srv->i_port );
if( psz_uri == NULL )
break;
if( items_exists( p_sys, psz_uri ) )
{
free( psz_uri );
continue;
}
items_add_input( p_sys, p_sd, psz_uri, p_srv->psz_device_name );
}
clear_srvs( p_srvs, i_nb_srv );
}
static bool
stop_sd_cb( void *p_this )
{
services_discovery_t *p_sd = ( services_discovery_t* )p_this;
struct discovery_sys *p_sys = p_sd->p_sys;
if( atomic_load( &p_sys->stop ) )
return true;
else
{
items_timeout( p_sys, p_sd, NULL );
return false;
}
}
static void *
RunSD( void *p_this )
{
vlc_thread_set_name("vlc-mdns-servis");
services_discovery_t *p_sd = ( services_discovery_t* )p_this;
struct discovery_sys *p_sys = p_sd->p_sys;
int i_status = mdns_listen( p_sys->p_microdns,
p_sys->ppsz_service_names,
p_sys->i_nb_service_names,
RR_PTR, SEC_FROM_VLC_TICK(LISTEN_INTERVAL),
stop_sd_cb, new_entries_sd_cb, p_sd );
if( i_status < 0 )
print_error( VLC_OBJECT( p_sd ), "listen", i_status );
return NULL;
}
static void
new_entries_rd_cb( void *p_this, int i_status, const struct rr_entry *p_entries )
{
vlc_renderer_discovery_t *p_rd = (vlc_renderer_discovery_t *)p_this;
struct discovery_sys *p_sys = p_rd->p_sys;
if( i_status < 0 )
{
print_error( VLC_OBJECT( p_rd ), "entry callback", i_status );
return;
}
struct srv *p_srvs;
unsigned i_nb_srv;
const char *psz_ip;
bool b_ipv6 = false;
if( parse_entries( p_entries, true, &p_srvs, &i_nb_srv,
&psz_ip, &b_ipv6 ) != VLC_SUCCESS )
return;
/* send new input items (if they don't already exist) */
for( unsigned int i = 0; i < i_nb_srv; ++i )
{
struct srv *p_srv = &p_srvs[i];
char *psz_icon_uri = NULL;
char *psz_uri = create_uri( p_srv->psz_protocol, psz_ip, b_ipv6,
p_srv->i_port );
const char *psz_demux_filter = NULL;
if( psz_uri == NULL )
break;
if( items_exists( p_sys, psz_uri ) )
{
free( psz_uri );
continue;
}
if( p_srv->renderer.psz_icon != NULL
&& asprintf( &psz_icon_uri, "http://%s:8008%s", psz_ip, p_srv->renderer.psz_icon )
== -1 )
{
free( psz_uri );
break;
}
if( p_srv->renderer.psz_model != NULL )
{
char* psz_name;
if ( asprintf( &psz_name, "%s (%s)", p_srv->psz_device_name,
p_srv->renderer.psz_model ) > 0 )
{
free( p_srv->psz_device_name );
p_srv->psz_device_name = psz_name;
}
}
if( strcmp( p_srv->psz_protocol, "chromecast" ) == 0)
psz_demux_filter = "cc_demux";
items_add_renderer( p_sys, p_rd, p_srv->psz_device_name, psz_uri,
psz_demux_filter, psz_icon_uri,
p_srv->renderer.i_renderer_flags );
free(psz_icon_uri);
}
clear_srvs( p_srvs, i_nb_srv );
}
static bool
stop_rd_cb( void *p_this )
{
vlc_renderer_discovery_t *p_rd = p_this;
struct discovery_sys *p_sys = p_rd->p_sys;
if( atomic_load( &p_sys->stop ) )
return true;
else
{
items_timeout( p_sys, NULL, p_rd );
return false;
}
}
static void *
RunRD( void *p_this )
{
vlc_thread_set_name("vlc-mdns-render");
vlc_renderer_discovery_t *p_rd = p_this;
struct discovery_sys *p_sys = p_rd->p_sys;
int i_status = mdns_listen( p_sys->p_microdns,
p_sys->ppsz_service_names,
p_sys->i_nb_service_names,
RR_PTR, SEC_FROM_VLC_TICK(LISTEN_INTERVAL),
stop_rd_cb, new_entries_rd_cb, p_rd );
if( i_status < 0 )
print_error( VLC_OBJECT( p_rd ), "listen", i_status );
return NULL;
}
static int
OpenCommon( vlc_object_t *p_obj, struct discovery_sys *p_sys, bool b_renderer )
{
int i_ret = VLC_EGENERIC;
atomic_init( &p_sys->stop, false );
vlc_array_init( &p_sys->items );
/* Listen to protocols that are handled by VLC */
for( unsigned int i = 0; i < NB_PROTOCOLS; ++i )
{
if( protocols[i].b_renderer == b_renderer )
p_sys->ppsz_service_names[p_sys->i_nb_service_names++] =
protocols[i].psz_service_name;
}
if( p_sys->i_nb_service_names == 0 )
{
msg_Err( p_obj, "no services found" );
goto error;
}
for( unsigned int i = 0; i < p_sys->i_nb_service_names; ++i )
msg_Dbg( p_obj, "mDNS: listening to %s %s", p_sys->ppsz_service_names[i],
b_renderer ? "renderer" : "service" );
int i_status;
if( ( i_status = mdns_init( &p_sys->p_microdns, MDNS_ADDR_IPV4,
MDNS_PORT ) ) < 0 )
{
print_error( p_obj, "init", i_status );
goto error;
}
if( vlc_clone( &p_sys->thread, b_renderer ? RunRD : RunSD, p_obj) )
{
msg_Err( p_obj, "Can't run the lookup thread" );
goto error;
}
return VLC_SUCCESS;
error:
if( p_sys->p_microdns != NULL )
mdns_destroy( p_sys->p_microdns );
free( p_sys );
return i_ret;
}
static void
CleanCommon( struct discovery_sys *p_sys )
{
atomic_store( &p_sys->stop, true );
vlc_join( p_sys->thread, NULL );
items_clear( p_sys );
mdns_destroy( p_sys->p_microdns );
free( p_sys );
}
static int
OpenSD( vlc_object_t *p_obj )
{
services_discovery_t *p_sd = (services_discovery_t *)p_obj;
struct discovery_sys *p_sys = calloc( 1, sizeof(struct discovery_sys) );
if( !p_sys )
return VLC_ENOMEM;
p_sd->p_sys = p_sys;
p_sd->description = _("mDNS Network Discovery");
config_ChainParse( p_sd, CFG_PREFIX, ppsz_options, p_sd->p_cfg );
return OpenCommon( p_obj, p_sys, false );
}
static void
CloseSD( vlc_object_t *p_this )
{
services_discovery_t *p_sd = (services_discovery_t *) p_this;
struct discovery_sys *p_sys = p_sd->p_sys;
CleanCommon( p_sys );
}
static int
OpenRD( vlc_object_t *p_obj )
{
vlc_renderer_discovery_t *p_rd = (vlc_renderer_discovery_t *)p_obj;
struct discovery_sys *p_sys = calloc( 1, sizeof(struct discovery_sys) );
if( !p_sys )
return VLC_ENOMEM;
p_rd->p_sys = p_sys;
config_ChainParse( p_rd, CFG_PREFIX, ppsz_options, p_rd->p_cfg );
return OpenCommon( p_obj, p_sys, true );
}
static void
CloseRD( vlc_object_t *p_this )
{
vlc_renderer_discovery_t *p_rd = (vlc_renderer_discovery_t *) p_this;
struct discovery_sys *p_sys = p_rd->p_sys;
CleanCommon( p_sys );
}
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