modules/access_output/bonjour.c

   1 /*****************************************************************************
   2  * bonjour.c
   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  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include "bonjour.h"
  34
  35 #ifdef HAVE_AVAHI_CLIENT
  36 #include <vlc_sout.h>
  37
  38 #include <avahi-client/client.h>
  39 #include <avahi-client/publish.h>
  40 #include <avahi-client/lookup.h>
  41 #include <avahi-common/alternative.h>
  42 #include <avahi-common/simple-watch.h>
  43 #include <avahi-common/malloc.h>
  44 #include <avahi-common/error.h>
  45
  46 /*****************************************************************************
  47  * Structures
  48  *****************************************************************************/
  49 typedef struct poll_thread_t
  50 {
  51     VLC_COMMON_MEMBERS
  52
  53     AvahiSimplePoll     *simple_poll;
  54 } poll_thread_t;
  55
  56 typedef struct bonjour_t
  57 {
  58     vlc_object_t        *p_log;
  59
  60     poll_thread_t       *poll_thread;
  61     AvahiSimplePoll     *simple_poll;
  62     AvahiEntryGroup     *group;
  63     AvahiClient         *client;
  64     char                *psz_stype;
  65     char                *psz_name;
  66     int                 i_port;
  67     char                *psz_txt;
  68 } bonjour_t;
  69
  70 /*****************************************************************************
  71  * Prototypes
  72  *****************************************************************************/
  73 static int create_service( bonjour_t * );
  74
  75 /*****************************************************************************
  76  * entry_group_callback
  77  *****************************************************************************/
  78 static void entry_group_callback( AvahiEntryGroup *g,
  79                                   AvahiEntryGroupState state,
  80                                   void *userdata )
  81 {
  82     (void)g;
  83     bonjour_t *p_sys = (bonjour_t *)userdata;
  84
  85     if( state == AVAHI_ENTRY_GROUP_ESTABLISHED )
  86     {
  87         msg_Dbg( p_sys->p_log, "service '%s' successfully established",
  88                  p_sys->psz_name );
  89     }
  90     else if( state == AVAHI_ENTRY_GROUP_COLLISION )
  91     {
  92         char *n;
  93
  94         n = avahi_alternative_service_name( p_sys->psz_name );
  95         avahi_free( p_sys->psz_name );
  96         p_sys->psz_name = n;
  97
  98         create_service( p_sys );
  99     }
 100 }
 101
 102 /*****************************************************************************
 103  * create_service
 104  *****************************************************************************/
 105 static int create_service( bonjour_t *p_sys )
 106 {
 107     int error;
 108
 109     if( p_sys->group == NULL )
 110     {
 111         p_sys->group = avahi_entry_group_new( p_sys->client,
 112                                               entry_group_callback,
 113                                               p_sys );
 114         if( p_sys->group == NULL )
 115         {
 116             msg_Err( p_sys->p_log, "failed to create avahi entry group: %s",
 117                      avahi_strerror( avahi_client_errno( p_sys->client ) ) );
 118             return VLC_EGENERIC;
 119         }
 120     }
 121
 122     error = avahi_entry_group_add_service( p_sys->group, AVAHI_IF_UNSPEC,
 123                                            AVAHI_PROTO_UNSPEC, 0, p_sys->psz_name,
 124                                            p_sys->psz_stype, NULL, NULL,
 125                                            p_sys->i_port,
 126                                            p_sys->psz_txt, NULL );
 127     if( error < 0 )
 128     {
 129         msg_Err( p_sys->p_log, "failed to add %s service: %s",
 130                  p_sys->psz_stype, avahi_strerror( error ) );
 131         return VLC_EGENERIC;
 132     }
 133
 134     error = avahi_entry_group_commit( p_sys->group );
 135     if( error < 0 )
 136     {
 137         msg_Err( p_sys->p_log, "failed to commit entry group: %s",
 138                  avahi_strerror( error ) );
 139         return VLC_EGENERIC;
 140     }
 141
 142     return VLC_SUCCESS;
 143 }
 144
 145 /*****************************************************************************
 146  * client_callback
 147  *****************************************************************************/
 148 static void client_callback( AvahiClient *c,
 149                              AvahiClientState state,
 150                              void * userdata )
 151 {
 152     bonjour_t *p_sys = (bonjour_t *)userdata;
 153
 154     if( state == AVAHI_CLIENT_S_RUNNING )
 155     {
 156         p_sys->client = c;
 157         create_service( p_sys );
 158     }
 159     else if( state == AVAHI_CLIENT_S_COLLISION )
 160     {
 161         if( p_sys->group != NULL )
 162             avahi_entry_group_reset( p_sys->group );
 163     }
 164     else if( state == AVAHI_CLIENT_FAILURE &&
 165               (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) )
 166     {
 167         msg_Err( p_sys->p_log, "avahi client disconnected" );
 168         avahi_simple_poll_quit( p_sys->simple_poll );
 169     }
 170 }
 171
 172 /*****************************************************************************
 173  * poll_iterate_thread
 174  *****************************************************************************/
 175 static void* poll_iterate_thread( vlc_object_t *p_this )
 176 {
 177     poll_thread_t *p_pt = (poll_thread_t*)p_this;
 178     int canc = vlc_savecancel ();
 179
 180     while( vlc_object_alive (p_pt) )
 181         if( avahi_simple_poll_iterate( p_pt->simple_poll, 100 ) != 0 )
 182             break;
 183
 184     vlc_restorecancel (canc);
 185     return NULL;
 186 }
 187
 188 /*****************************************************************************
 189  * bonjour_start_service
 190  *****************************************************************************/
 191 void *bonjour_start_service( vlc_object_t *p_log, const char *psz_stype,
 192                              const char *psz_name, int i_port, char *psz_txt )
 193 {
 194     int err;
 195     bonjour_t *p_sys;
 196
 197     p_sys = (bonjour_t *)malloc( sizeof(*p_sys) );
 198     if( p_sys == NULL )
 199         return NULL;
 200
 201     memset( p_sys, 0, sizeof(*p_sys) );
 202
 203     p_sys->p_log = p_log;
 204
 205     p_sys->i_port = i_port;
 206     p_sys->psz_name = avahi_strdup( psz_name );
 207     p_sys->psz_stype = avahi_strdup( psz_stype );
 208     if( p_sys->psz_name == NULL || p_sys->psz_stype == NULL )
 209         goto error;
 210
 211     if( psz_txt != NULL )
 212     {
 213         p_sys->psz_txt = avahi_strdup( psz_txt );
 214         if( p_sys->psz_txt == NULL )
 215             goto error;
 216     }
 217
 218     p_sys->simple_poll = avahi_simple_poll_new();
 219     if( p_sys->simple_poll == NULL )
 220     {
 221         msg_Err( p_sys->p_log, "failed to create avahi simple pool" );
 222         goto error;
 223     }
 224
 225     p_sys->client = avahi_client_new( avahi_simple_poll_get(p_sys->simple_poll),
 226                                       0,
 227                                       client_callback, p_sys, &err );
 228     if( p_sys->client == NULL )
 229     {
 230         msg_Err( p_sys->p_log, "failed to create avahi client: %s",
 231                  avahi_strerror( err ) );
 232         goto error;
 233     }
 234
 235     p_sys->poll_thread = vlc_object_create( p_sys->p_log,
 236                                             sizeof(poll_thread_t) );
 237     if( p_sys->poll_thread == NULL )
 238         goto error;
 239     p_sys->poll_thread->simple_poll = p_sys->simple_poll;
 240
 241     if( vlc_thread_create( p_sys->poll_thread, "Avahi Poll Iterate Thread",
 242                            poll_iterate_thread,
 243                            VLC_THREAD_PRIORITY_HIGHEST, false ) )
 244     {
 245         msg_Err( p_sys->p_log, "failed to create poll iterate thread" );
 246         goto error;
 247     }
 248
 249     return (void *)p_sys;
 250
 251 error:
 252     if( p_sys->poll_thread != NULL )
 253         vlc_object_release( p_sys->poll_thread );
 254     if( p_sys->client != NULL )
 255         avahi_client_free( p_sys->client );
 256     if( p_sys->simple_poll != NULL )
 257         avahi_simple_poll_free( p_sys->simple_poll );
 258     if( p_sys->psz_stype != NULL )
 259         avahi_free( p_sys->psz_stype );
 260     if( p_sys->psz_name != NULL )
 261         avahi_free( p_sys->psz_name );
 262     if( p_sys->psz_txt != NULL )
 263         avahi_free( p_sys->psz_txt );
 264
 265     free( p_sys );
 266
 267     return NULL;
 268 }
 269
 270 /*****************************************************************************
 271  * bonjour_stop_service
 272  *****************************************************************************/
 273 void bonjour_stop_service( void *_p_sys )
 274 {
 275     bonjour_t *p_sys = (bonjour_t *)_p_sys;
 276
 277     vlc_object_kill( p_sys->poll_thread );
 278     vlc_thread_join( p_sys->poll_thread );
 279     vlc_object_release( p_sys->poll_thread );
 280
 281     if( p_sys->group != NULL )
 282         avahi_entry_group_free( p_sys->group );
 283
 284     avahi_client_free( p_sys->client );
 285     avahi_simple_poll_free( p_sys->simple_poll );
 286
 287     if( p_sys->psz_name != NULL )
 288         avahi_free( p_sys->psz_name );
 289
 290     if( p_sys->psz_txt != NULL )
 291         avahi_free( p_sys->psz_txt );
 292
 293     avahi_free( p_sys->psz_stype );
 294
 295     free( _p_sys );
 296 }
 297
 298 #endif /* HAVE_AVAHI_CLIENT */