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

   1 /*****************************************************************************
   2  * bonjour.c: Bonjour services discovery module
   3  *****************************************************************************
   4  * Copyright (C) 2005 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_playlist.h>
  35 #include <vlc_arrays.h>
  36
  37 #include <avahi-client/client.h>
  38 #ifdef HAVE_AVAHI_06
  39 # include <avahi-client/publish.h>
  40 # include <avahi-client/lookup.h>
  41 #endif
  42 #include <avahi-common/simple-watch.h>
  43 #include <avahi-common/malloc.h>
  44 #include <avahi-common/error.h>
  45
  46 /*****************************************************************************
  47  * Module descriptor
  48  *****************************************************************************/
  49
  50 /* Callbacks */
  51     static int  Open ( vlc_object_t * );
  52     static void Close( vlc_object_t * );
  53
  54 vlc_module_begin();
  55     set_shortname( "Bonjour" );
  56     set_description( N_("Bonjour services") );
  57     set_category( CAT_PLAYLIST );
  58     set_subcategory( SUBCAT_PLAYLIST_SD );
  59     set_capability( "services_discovery", 0 );
  60     set_callbacks( Open, Close );
  61 vlc_module_end();
  62
  63 /*****************************************************************************
  64  * Local structures
  65  *****************************************************************************/
  66
  67 struct services_discovery_sys_t
  68 {
  69     AvahiSimplePoll     *simple_poll;
  70     AvahiClient         *client;
  71     AvahiServiceBrowser *sb;
  72     vlc_dictionary_t    services_name_to_input_item;
  73 };
  74
  75 /*****************************************************************************
  76  * Local prototypes
  77  *****************************************************************************/
  78
  79 /* Main functions */
  80     static void Run    ( services_discovery_t *p_intf );
  81
  82 /*****************************************************************************
  83  * client_callback
  84  *****************************************************************************/
  85 static void client_callback( AvahiClient *c, AvahiClientState state,
  86                              void * userdata )
  87 {
  88     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  89     services_discovery_sys_t *p_sys = p_sd->p_sys;
  90
  91 #ifdef HAVE_AVAHI_06
  92     if( state == AVAHI_CLIENT_FAILURE &&
  93         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  94 #else
  95     if( state == AVAHI_CLIENT_DISCONNECTED )
  96 #endif
  97     {
  98         msg_Err( p_sd, "avahi client disconnected" );
  99         avahi_simple_poll_quit( p_sys->simple_poll );
 100     }
 101 }
 102
 103 /*****************************************************************************
 104  * resolve_callback
 105  *****************************************************************************/
 106 static void resolve_callback(
 107     AvahiServiceResolver *r,
 108     AvahiIfIndex interface,
 109     AvahiProtocol protocol,
 110     AvahiResolverEvent event,
 111     const char *name,
 112     const char *type,
 113     const char *domain,
 114     const char *host_name,
 115     const AvahiAddress *address,
 116     uint16_t port,
 117     AvahiStringList *txt,
 118 #ifdef HAVE_AVAHI_06
 119     AvahiLookupResultFlags flags,
 120 #endif
 121     void* userdata )
 122 {
 123     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 124     services_discovery_sys_t *p_sys = p_sd->p_sys;
 125
 126     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 127 #ifdef HAVE_AVAHI_06
 128     VLC_UNUSED(flags);
 129 #endif
 130
 131 #ifdef HAVE_AVAHI_06
 132     if( event == AVAHI_RESOLVER_FAILURE )
 133 #else
 134     if( event == AVAHI_RESOLVER_TIMEOUT )
 135 #endif
 136     {
 137         msg_Err( p_sd,
 138                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 139                  name, type, domain );
 140     }
 141     else if( event == AVAHI_RESOLVER_FOUND )
 142     {
 143         char a[128];
 144         char *psz_uri = NULL;
 145         char *psz_addr = NULL;
 146         AvahiStringList *asl = NULL;
 147         input_item_t *p_input = NULL;
 148
 149         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 150                  name, type, domain );
 151
 152         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 153         if( protocol == AVAHI_PROTO_INET6 )
 154             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 155                 return;
 156
 157         if( txt != NULL )
 158             asl = avahi_string_list_find( txt, "path" );
 159         if( asl != NULL )
 160         {
 161             size_t size;
 162             char *key = NULL;
 163             char *value = NULL;
 164             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 165                 value != NULL )
 166             {
 167                 if( asprintf( &psz_uri, "http://%s:%d%s",
 168                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 169                 {
 170                     free( psz_addr );
 171                     return;
 172                 }
 173             }
 174             if( key != NULL )
 175                 avahi_free( (void *)key );
 176             if( value != NULL )
 177                 avahi_free( (void *)value );
 178         }
 179         else
 180         {
 181             if( asprintf( &psz_uri, "http://%s:%d",
 182                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 183             {
 184                 free( psz_addr );
 185                 return;
 186             }
 187         }
 188
 189         if( psz_addr != NULL )
 190             free( (void *)psz_addr );
 191
 192         if( psz_uri != NULL )
 193         {
 194             p_input = input_ItemNewExt( p_sd, psz_uri, name, 0, NULL, -1 );
 195             free( (void *)psz_uri );
 196         }
 197         if( p_input != NULL )
 198         {
 199             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 200                 name, p_input );
 201             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 202             vlc_gc_decref( p_input );
 203        }
 204     }
 205
 206     avahi_service_resolver_free( r );
 207 }
 208
 209 /*****************************************************************************
 210  * browser_callback
 211  *****************************************************************************/
 212 static void browse_callback(
 213     AvahiServiceBrowser *b,
 214     AvahiIfIndex interface,
 215     AvahiProtocol protocol,
 216     AvahiBrowserEvent event,
 217     const char *name,
 218     const char *type,
 219     const char *domain,
 220 #ifdef HAVE_AVAHI_06
 221     AvahiLookupResultFlags flags,
 222 #endif
 223     void* userdata )
 224 {
 225     VLC_UNUSED(b);
 226 #ifdef HAVE_AVAHI_06
 227     VLC_UNUSED(flags);
 228 #endif
 229     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 230     services_discovery_sys_t *p_sys = p_sd->p_sys;
 231     if( event == AVAHI_BROWSER_NEW )
 232     {
 233         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 234                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 235 #ifdef HAVE_AVAHI_06
 236                                         0,
 237 #endif
 238                                         resolve_callback, userdata ) == NULL )
 239         {
 240             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 241                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 242         }
 243     }
 244     else if( name )
 245     {
 246         /** \todo Store the input id and search it, rather than searching the items */
 247         input_item_t *p_item;
 248         p_item = vlc_dictionary_value_for_key(
 249                         &p_sys->services_name_to_input_item,
 250                         name );
 251         if( !p_item )
 252             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 253         else
 254         {
 255             services_discovery_RemoveItem( p_sd, p_item );
 256             vlc_dictionary_remove_value_for_key(
 257                         &p_sys->services_name_to_input_item,
 258                         name );
 259         }
 260     }
 261 }
 262
 263 /*****************************************************************************
 264  * Open: initialize and create stuff
 265  *****************************************************************************/
 266 static int Open( vlc_object_t *p_this )
 267 {
 268     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 269     services_discovery_sys_t *p_sys;
 270     int err;
 271
 272     p_sd->p_sys = p_sys = (services_discovery_sys_t *)malloc(
 273         sizeof( services_discovery_sys_t ) );
 274
 275     if( !p_sys )
 276         return VLC_ENOMEM;
 277
 278     memset( p_sys, 0, sizeof(*p_sys) );
 279
 280     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 281
 282     p_sys->simple_poll = avahi_simple_poll_new();
 283     if( p_sys->simple_poll == NULL )
 284     {
 285         msg_Err( p_sd, "failed to create avahi simple poll" );
 286         goto error;
 287     }
 288
 289     p_sys->client = avahi_client_new( avahi_simple_poll_get(p_sys->simple_poll),
 290 #ifdef HAVE_AVAHI_06
 291                                       0,
 292 #endif
 293                                       client_callback, p_sd, &err );
 294     if( p_sys->client == NULL )
 295     {
 296         msg_Err( p_sd, "failed to create avahi client: %s",
 297                  avahi_strerror( err ) );
 298         goto error;
 299     }
 300
 301     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 302                                            AVAHI_PROTO_UNSPEC,
 303                                            "_vlc-http._tcp", NULL,
 304 #ifdef HAVE_AVAHI_06
 305                                            0,
 306 #endif
 307                                            browse_callback, p_sd );
 308     if( p_sys->sb == NULL )
 309     {
 310         msg_Err( p_sd, "failed to create avahi service browser" );
 311         goto error;
 312     }
 313
 314     services_discovery_SetLocalizedName( p_sd, _("Bonjour") );
 315
 316     p_sd->pf_run = Run;
 317
 318     return VLC_SUCCESS;
 319
 320 error:
 321     if( p_sys->sb != NULL )
 322         avahi_service_browser_free( p_sys->sb );
 323     if( p_sys->client != NULL )
 324         avahi_client_free( p_sys->client );
 325     if( p_sys->simple_poll != NULL )
 326         avahi_simple_poll_free( p_sys->simple_poll );
 327
 328     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 329     free( p_sys );
 330
 331     return VLC_EGENERIC;
 332 }
 333
 334 /*****************************************************************************
 335  * Close: cleanup
 336  *****************************************************************************/
 337 static void Close( vlc_object_t *p_this )
 338 {
 339     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 340     services_discovery_sys_t *p_sys = p_sd->p_sys;
 341
 342     avahi_service_browser_free( p_sys->sb );
 343     avahi_client_free( p_sys->client );
 344     avahi_simple_poll_free( p_sys->simple_poll );
 345
 346     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 347     free( p_sys );
 348 }
 349
 350 /*****************************************************************************
 351  * Run: main thread
 352  *****************************************************************************/
 353 static void Run( services_discovery_t *p_sd )
 354 {
 355     services_discovery_sys_t *p_sys = p_sd->p_sys;
 356
 357     while( vlc_object_alive (p_sd) )
 358     {
 359         if( avahi_simple_poll_iterate( p_sys->simple_poll, 100 ) != 0 )
 360         {
 361             msg_Err( p_sd, "poll iterate failed" );
 362             break;
 363         }
 364     }
 365 }