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/vlc.h>
  33 #include <vlc_playlist.h>
  34 #include <vlc_arrays.h>
  35
  36 #include <avahi-client/client.h>
  37 #ifdef HAVE_AVAHI_06
  38 # include <avahi-client/publish.h>
  39 # include <avahi-client/lookup.h>
  40 #endif
  41 #include <avahi-common/simple-watch.h>
  42 #include <avahi-common/malloc.h>
  43 #include <avahi-common/error.h>
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48
  49 /* Callbacks */
  50     static int  Open ( vlc_object_t * );
  51     static void Close( vlc_object_t * );
  52
  53 vlc_module_begin();
  54     set_shortname( "Bonjour" );
  55     set_description( _("Bonjour services") );
  56     set_category( CAT_PLAYLIST );
  57     set_subcategory( SUBCAT_PLAYLIST_SD );
  58     set_capability( "services_discovery", 0 );
  59     set_callbacks( Open, Close );
  60 vlc_module_end();
  61
  62 /*****************************************************************************
  63  * Local structures
  64  *****************************************************************************/
  65
  66 struct services_discovery_sys_t
  67 {
  68     AvahiSimplePoll     *simple_poll;
  69     AvahiClient         *client;
  70     AvahiServiceBrowser *sb;
  71     vlc_dictionary_t    services_name_to_input_item;
  72 };
  73
  74 /*****************************************************************************
  75  * Local prototypes
  76  *****************************************************************************/
  77
  78 /* Main functions */
  79     static void Run    ( services_discovery_t *p_intf );
  80
  81 /*****************************************************************************
  82  * client_callback
  83  *****************************************************************************/
  84 static void client_callback( AvahiClient *c, AvahiClientState state,
  85                              void * userdata )
  86 {
  87     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
  88     services_discovery_sys_t *p_sys = p_sd->p_sys;
  89
  90 #ifdef HAVE_AVAHI_06
  91     if( state == AVAHI_CLIENT_FAILURE &&
  92         (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
  93 #else
  94     if( state == AVAHI_CLIENT_DISCONNECTED )
  95 #endif
  96     {
  97         msg_Err( p_sd, "avahi client disconnected" );
  98         avahi_simple_poll_quit( p_sys->simple_poll );
  99     }
 100 }
 101
 102 /*****************************************************************************
 103  * resolve_callback
 104  *****************************************************************************/
 105 static void resolve_callback(
 106     AvahiServiceResolver *r,
 107     AvahiIfIndex interface,
 108     AvahiProtocol protocol,
 109     AvahiResolverEvent event,
 110     const char *name,
 111     const char *type,
 112     const char *domain,
 113     const char *host_name,
 114     const AvahiAddress *address,
 115     uint16_t port,
 116     AvahiStringList *txt,
 117 #ifdef HAVE_AVAHI_06
 118     AvahiLookupResultFlags flags,
 119 #endif
 120     void* userdata )
 121 {
 122     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 123     services_discovery_sys_t *p_sys = p_sd->p_sys;
 124
 125     VLC_UNUSED(interface); VLC_UNUSED(host_name);
 126 #ifdef HAVE_AVAHI_06
 127     VLC_UNUSED(flags);
 128 #endif
 129
 130 #ifdef HAVE_AVAHI_06
 131     if( event == AVAHI_RESOLVER_FAILURE )
 132 #else
 133     if( event == AVAHI_RESOLVER_TIMEOUT )
 134 #endif
 135     {
 136         msg_Err( p_sd,
 137                  "failed to resolve service '%s' of type '%s' in domain '%s'",
 138                  name, type, domain );
 139     }
 140     else if( event == AVAHI_RESOLVER_FOUND )
 141     {
 142         char a[128];
 143         char *psz_uri = NULL;
 144         char *psz_addr = NULL;
 145         AvahiStringList *asl = NULL;
 146         input_item_t *p_input = NULL;
 147
 148         msg_Dbg( p_sd, "service '%s' of type '%s' in domain '%s'",
 149                  name, type, domain );
 150
 151         avahi_address_snprint(a, (sizeof(a)/sizeof(a[0]))-1, address);
 152         if( protocol == AVAHI_PROTO_INET6 )
 153             if( asprintf( &psz_addr, "[%s]", a ) == -1 )
 154                 return;
 155
 156         if( txt != NULL )
 157             asl = avahi_string_list_find( txt, "path" );
 158         if( asl != NULL )
 159         {
 160             size_t size;
 161             char *key = NULL;
 162             char *value = NULL;
 163             if( avahi_string_list_get_pair( asl, &key, &value, &size ) == 0 &&
 164                 value != NULL )
 165             {
 166                 if( asprintf( &psz_uri, "http://%s:%d%s",
 167                           psz_addr != NULL ? psz_addr : a, port, value ) == -1 )
 168                 {
 169                     free( psz_addr );
 170                     return;
 171                 }
 172             }
 173             if( key != NULL )
 174                 avahi_free( (void *)key );
 175             if( value != NULL )
 176                 avahi_free( (void *)value );
 177         }
 178         else
 179         {
 180             if( asprintf( &psz_uri, "http://%s:%d",
 181                       psz_addr != NULL ? psz_addr : a, port ) == -1 )
 182             {
 183                 free( psz_addr );
 184                 return;
 185             }
 186         }
 187
 188         if( psz_addr != NULL )
 189             free( (void *)psz_addr );
 190
 191         if( psz_uri != NULL )
 192         {
 193             p_input = input_ItemNewExt( p_sd, psz_uri, name, 0, NULL, -1 );
 194             free( (void *)psz_uri );
 195         }
 196         if( p_input != NULL )
 197         {
 198             vlc_dictionary_insert( &p_sys->services_name_to_input_item,
 199                 name, p_input );
 200             services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
 201             vlc_gc_decref( p_input );
 202        }
 203     }
 204
 205     avahi_service_resolver_free( r );
 206 }
 207
 208 /*****************************************************************************
 209  * browser_callback
 210  *****************************************************************************/
 211 static void browse_callback(
 212     AvahiServiceBrowser *b,
 213     AvahiIfIndex interface,
 214     AvahiProtocol protocol,
 215     AvahiBrowserEvent event,
 216     const char *name,
 217     const char *type,
 218     const char *domain,
 219 #ifdef HAVE_AVAHI_06
 220     AvahiLookupResultFlags flags,
 221 #endif
 222     void* userdata )
 223 {
 224     VLC_UNUSED(b);
 225 #ifdef HAVE_AVAHI_06
 226     VLC_UNUSED(flags);
 227 #endif
 228     services_discovery_t *p_sd = ( services_discovery_t* )userdata;
 229     services_discovery_sys_t *p_sys = p_sd->p_sys;
 230     if( event == AVAHI_BROWSER_NEW )
 231     {
 232         if( avahi_service_resolver_new( p_sys->client, interface, protocol,
 233                                         name, type, domain, AVAHI_PROTO_UNSPEC,
 234 #ifdef HAVE_AVAHI_06
 235                                         0,
 236 #endif
 237                                         resolve_callback, userdata ) == NULL )
 238         {
 239             msg_Err( p_sd, "failed to resolve service '%s': %s", name,
 240                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 241         }
 242     }
 243     else if( name )
 244     {
 245         /** \todo Store the input id and search it, rather than searching the items */
 246         input_item_t *p_item;
 247         p_item = vlc_dictionary_value_for_key(
 248                         &p_sys->services_name_to_input_item,
 249                         name );
 250         if( !p_item )
 251             msg_Err( p_sd, "failed to find service '%s' in playlist", name );
 252         else
 253         {
 254             services_discovery_RemoveItem( p_sd, p_item );
 255             vlc_dictionary_remove_value_for_key(
 256                         &p_sys->services_name_to_input_item,
 257                         name );
 258         }
 259     }
 260 }
 261
 262 /*****************************************************************************
 263  * Open: initialize and create stuff
 264  *****************************************************************************/
 265 static int Open( vlc_object_t *p_this )
 266 {
 267     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 268     services_discovery_sys_t *p_sys;
 269     int err;
 270
 271     p_sd->p_sys = p_sys = (services_discovery_sys_t *)malloc(
 272         sizeof( services_discovery_sys_t ) );
 273     if( p_sd->p_sys == NULL )
 274     {
 275         msg_Err( p_sd, "out of memory" );
 276         return VLC_EGENERIC;
 277     }
 278
 279     memset( p_sys, 0, sizeof(*p_sys) );
 280
 281     vlc_dictionary_init( &p_sys->services_name_to_input_item, 1 );
 282
 283     p_sys->simple_poll = avahi_simple_poll_new();
 284     if( p_sys->simple_poll == NULL )
 285     {
 286         msg_Err( p_sd, "failed to create avahi simple poll" );
 287         goto error;
 288     }
 289
 290     p_sys->client = avahi_client_new( avahi_simple_poll_get(p_sys->simple_poll),
 291 #ifdef HAVE_AVAHI_06
 292                                       0,
 293 #endif
 294                                       client_callback, p_sd, &err );
 295     if( p_sys->client == NULL )
 296     {
 297         msg_Err( p_sd, "failed to create avahi client: %s",
 298                  avahi_strerror( err ) );
 299         goto error;
 300     }
 301
 302     p_sys->sb = avahi_service_browser_new( p_sys->client, AVAHI_IF_UNSPEC,
 303                                            AVAHI_PROTO_UNSPEC,
 304                                            "_vlc-http._tcp", NULL,
 305 #ifdef HAVE_AVAHI_06
 306                                            0,
 307 #endif
 308                                            browse_callback, p_sd );
 309     if( p_sys->sb == NULL )
 310     {
 311         msg_Err( p_sd, "failed to create avahi service browser" );
 312         goto error;
 313     }
 314
 315     services_discovery_SetLocalizedName( p_sd, _("Bonjour") );
 316
 317     p_sd->pf_run = Run;
 318
 319     return VLC_SUCCESS;
 320
 321 error:
 322     if( p_sys->sb != NULL )
 323         avahi_service_browser_free( p_sys->sb );
 324     if( p_sys->client != NULL )
 325         avahi_client_free( p_sys->client );
 326     if( p_sys->simple_poll != NULL )
 327         avahi_simple_poll_free( p_sys->simple_poll );
 328
 329     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 330     free( p_sys );
 331
 332     return VLC_EGENERIC;
 333 }
 334
 335 /*****************************************************************************
 336  * Close: cleanup
 337  *****************************************************************************/
 338 static void Close( vlc_object_t *p_this )
 339 {
 340     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
 341     services_discovery_sys_t *p_sys = p_sd->p_sys;
 342
 343     avahi_service_browser_free( p_sys->sb );
 344     avahi_client_free( p_sys->client );
 345     avahi_simple_poll_free( p_sys->simple_poll );
 346
 347     vlc_dictionary_clear( &p_sys->services_name_to_input_item );
 348     free( p_sys );
 349 }
 350
 351 /*****************************************************************************
 352  * Run: main thread
 353  *****************************************************************************/
 354 static void Run( services_discovery_t *p_sd )
 355 {
 356     services_discovery_sys_t *p_sys = p_sd->p_sys;
 357
 358     while( !p_sd->b_die )
 359     {
 360         if( avahi_simple_poll_iterate( p_sys->simple_poll, 100 ) != 0 )
 361         {
 362             msg_Err( p_sd, "poll iterate failed" );
 363             break;
 364         }
 365     }
 366 }