git.sesse.net Git - vlc/blob - modules/services_discovery/bonjour.c

   1 /*****************************************************************************
   2  * bonjour.c: Bonjour services discovery module
   3  *****************************************************************************
   4  * Copyright (C) 2005-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jon Lech Johansen <jon@nanocrew.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Includes
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_services_discovery.h>
  35
  36 #include <avahi-client/client.h>
  37 #include <avahi-client/publish.h>
  38 #include <avahi-client/lookup.h>
  39 #include <avahi-common/thread-watch.h>
  40 #include <avahi-common/malloc.h>
  41 #include <avahi-common/error.h>
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46
  47 /* Callbacks */
  48     static int  Open ( vlc_object_t * );
  49     static void Close( vlc_object_t * );
  50
  51 vlc_module_begin ()
  52     set_shortname( "Bonjour" )
  53     set_description( N_("Bonjour services") )
  54     set_category( CAT_PLAYLIST )
  55     set_subcategory( SUBCAT_PLAYLIST_SD )
  56     set_capability( "services_discovery", 0 )
  57     set_callbacks( Open, Close )
  58 vlc_module_end ()
  59
  60 /*****************************************************************************
  61  * Local structures
  62  *****************************************************************************/
  63
  64 struct services_discovery_sys_t
  65 {
  66     AvahiThreadedPoll   *poll;
  67     AvahiClient         *client;
  68     AvahiServiceBrowser *sb;
  69     vlc_dictionary_t    services_name_to_input_item;
  70 };
  71
  72 /*****************************************************************************
  73  * Local prototypes
  74  *****************************************************************************/
  75
  76 /*****************************************************************************
  77  * client_callback
  78  *****************************************************************************/
  79 static void client_callback( AvahiClient *c, AvahiClientState state,
  80                              void * userdata )
  81 {
  82     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  83     services_discovery_sys_t *p_sys = p_sd->p_sys;
  84
  85     if( state == AVAHI_CLIENT_FAILURE &&
  86         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  87     {
  88         msg_Err( p_sd, "avahi client disconnected" );
  89         avahi_threaded_poll_quit( p_sys->poll );
  90     }
  91 }
  92
  93 /*****************************************************************************
  94  * resolve_callback
  95  *****************************************************************************/
  96 static void resolve_callback(
  97     AvahiServiceResolver *r,
  98     AvahiIfIndex interface,
  99     AvahiProtocol protocol,
 100     AvahiResolverEvent event,
 101     const char *name,
 102     const char *type,
 103     const char *domain,
 104     const char *host_name,
 105     const AvahiAddress *address,
 106     uint16_t port,
 107     AvahiStringList *txt,
 108     AvahiLookupResultFlags flags,
 109     void* userdata )
 110 {
 111     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 112     services_discovery_sys_t *p_sys = p_sd->p_sys;
 113
 114     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 115     VLC_UNUSED(flags);
 116
 117     if( event == AVAHI_RESOLVER_FAILURE )
 118     {
 119         msg_Err( p_sd,
 120                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 121                  name, type, domain );
 122     }
 123     else if( event == AVAHI_RESOLVER_FOUND )
 124     {
 125         char a[128];
 126         char *psz_uri = NULL;
 127         char *psz_addr = NULL;
 128         AvahiStringList *asl = NULL;
 129         input_item_t *p_input = NULL;
 130
 131         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 132                  name, type, domain );
 133
 134         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 135         if( protocol == AVAHI_PROTO_INET6 )
 136             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 137                 return;
 138
 139         if( txt != NULL )
 140             asl = avahi_string_list_find( txt, "path" );
 141         if( asl != NULL )
 142         {
 143             size_t size;
 144             char *key = NULL;
 145             char *value = NULL;
 146             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 147                 value != NULL )
 148             {
 149                 if( asprintf( &psz_uri, "http://%s:%d%s",
 150                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 151                 {
 152                     free( psz_addr );
 153                     return;
 154                 }
 155             }
 156             if( key != NULL )
 157                 avahi_free( (void *)key );
 158             if( value != NULL )
 159                 avahi_free( (void *)value );
 160         }
 161         else
 162         {
 163             if( asprintf( &psz_uri, "http://%s:%d",
 164                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 165             {
 166                 free( psz_addr );
 167                 return;
 168             }
 169         }
 170
 171         free( psz_addr );
 172
 173         if( psz_uri != NULL )
 174         {
 175             p_input = input_item_New( p_sd, psz_uri, name );
 176             free( psz_uri );
 177         }
 178         if( p_input != NULL )
 179         {
 180             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 181                 name, p_input );
 182             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 183             vlc_gc_decref( p_input );
 184        }
 185     }
 186
 187     avahi_service_resolver_free( r );
 188 }
 189
 190 /*****************************************************************************
 191  * browser_callback
 192  *****************************************************************************/
 193 static void browse_callback(
 194     AvahiServiceBrowser *b,
 195     AvahiIfIndex interface,
 196     AvahiProtocol protocol,
 197     AvahiBrowserEvent event,
 198     const char *name,
 199     const char *type,
 200     const char *domain,
 201     AvahiLookupResultFlags flags,
 202     void* userdata )
 203 {
 204     VLC_UNUSED(b);
 205     VLC_UNUSED(flags);
 206     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 207     services_discovery_sys_t *p_sys = p_sd->p_sys;
 208     if( event == AVAHI_BROWSER_NEW )
 209     {
 210         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 211                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 212                                         0,
 213                                         resolve_callback, userdata ) == NULL )
 214         {
 215             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 216                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 217         }
 218     }
 219     else if( name )
 220     {
 221         /** \todo Store the input id and search it, rather than searching the items */
 222         input_item_t *p_item;
 223         p_item = vlc_dictionary_value_for_key(
 224                         &p_sys->services_name_to_input_item,
 225                         name );
 226         if( !p_item )
 227             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 228         else
 229         {
 230             services_discovery_RemoveItem( p_sd, p_item );
 231             vlc_dictionary_remove_value_for_key(
 232                         &p_sys->services_name_to_input_item,
 233                         name, NULL, NULL );
 234         }
 235     }
 236 }
 237
 238 /*****************************************************************************
 239  * Open: initialize and create stuff
 240  *****************************************************************************/
 241 static int Open( vlc_object_t *p_this )
 242 {
 243     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 244     services_discovery_sys_t *p_sys;
 245     int err;
 246
 247     p_sd->p_sys = p_sys = calloc( 1, sizeof( services_discovery_sys_t ) );
 248     if( !p_sys )
 249         return VLC_ENOMEM;
 250
 251     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 252
 253     p_sys->poll = avahi_threaded_poll_new();
 254     if( p_sys->poll == NULL )
 255     {
 256         msg_Err( p_sd, "failed to create Avahi threaded poll" );
 257         goto error;
 258     }
 259
 260     p_sys->client = avahi_client_new( avahi_threaded_poll_get(p_sys->poll),
 261                                       0, client_callback, p_sd, &err );
 262     if( p_sys->client == NULL )
 263     {
 264         msg_Err( p_sd, "failed to create avahi client: %s",
 265                  avahi_strerror( err ) );
 266         goto error;
 267     }
 268
 269     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 270                                            AVAHI_PROTO_UNSPEC,
 271                                            "_vlc-http._tcp", NULL,
 272                                            0, browse_callback, p_sd );
 273     if( p_sys->sb == NULL )
 274     {
 275         msg_Err( p_sd, "failed to create avahi service browser" );
 276         goto error;
 277     }
 278
 279     return VLC_SUCCESS;
 280
 281 error:
 282     if( p_sys->sb != NULL )
 283         avahi_service_browser_free( p_sys->sb );
 284     if( p_sys->client != NULL )
 285         avahi_client_free( p_sys->client );
 286     if( p_sys->poll != NULL )
 287         avahi_threaded_poll_free( p_sys->poll );
 288
 289     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 290     free( p_sys );
 291
 292     return VLC_EGENERIC;
 293 }
 294
 295 /*****************************************************************************
 296  * Close: cleanup
 297  *****************************************************************************/
 298 static void Close( vlc_object_t *p_this )
 299 {
 300     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 301     services_discovery_sys_t *p_sys = p_sd->p_sys;
 302
 303     avahi_service_browser_free( p_sys->sb );
 304     avahi_client_free( p_sys->client );
 305     avahi_threaded_poll_free( p_sys->poll );
 306
 307     vlc_dictionary_clear( &p_sys->services_name_to_input_item, NULL, NULL );
 308     free( p_sys );
 309 }