Paul LietarandJames Laird
3896909080
mDNS is now handled more or less in the same way audio is. Multiple mDNS backends are available, shairport tries them all until one works. This makes it, IMHO, cleaner, and easier to add other mDNS backends in the future, such as using tinysvcmdns or dns-sd library. Also it will also allow to define mDNS backends as plugins, in a similar way it is done in PR #230.
148 lines
4.5 KiB
C
148 lines
4.5 KiB
C
/*
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* Embedded Avahi client. This file is part of Shairport.
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* Copyright (c) James Laird 2013
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <avahi-client/client.h>
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#include <avahi-client/publish.h>
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#include <avahi-common/thread-watch.h>
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#include <avahi-common/error.h>
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#include <string.h>
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#include "common.h"
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#include "mdns.h"
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static AvahiClient *client = NULL;
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static AvahiEntryGroup *group = NULL;
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static AvahiThreadedPoll *tpoll = NULL;
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static char *name = NULL;
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static int port = 0;
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static void egroup_callback(AvahiEntryGroup *g,
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AvahiEntryGroupState state,
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AVAHI_GCC_UNUSED void *userdata) {
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if (state==AVAHI_ENTRY_GROUP_COLLISION)
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die("service name already exists on network!");
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if (state==AVAHI_ENTRY_GROUP_FAILURE)
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die("avahi entry group failure!");
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}
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static void register_service(AvahiClient *c) {
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debug(1, "avahi: register_service\n");
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if (!group)
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group = avahi_entry_group_new(c, egroup_callback, NULL);
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if (!group)
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die("avahi_entry_group_new failed");
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if (!avahi_entry_group_is_empty(group))
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return;
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int ret;
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ret = avahi_entry_group_add_service(group,
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AVAHI_IF_UNSPEC,
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AVAHI_PROTO_UNSPEC,
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0,
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name,
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"_raop._tcp",
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NULL,
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NULL,
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port,
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MDNS_RECORD,
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NULL);
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if (ret < 0)
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die("avahi_entry_group_add_service failed");
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ret = avahi_entry_group_commit(group);
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if (ret < 0)
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die("avahi_entry_group_commit failed");
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}
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static void client_callback(AvahiClient *c,
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AvahiClientState state,
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AVAHI_GCC_UNUSED void * userdata) {
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switch (state) {
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case AVAHI_CLIENT_S_REGISTERING:
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if (group)
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avahi_entry_group_reset(group);
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break;
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case AVAHI_CLIENT_S_RUNNING:
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register_service(c);
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break;
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case AVAHI_CLIENT_FAILURE:
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case AVAHI_CLIENT_S_COLLISION:
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die("avahi client failure");
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case AVAHI_CLIENT_CONNECTING:
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break;
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}
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}
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static int avahi_register(char *srvname, int srvport) {
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debug(1, "avahi: avahi_register\n");
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name = strdup(srvname);
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port = srvport;
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int err;
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if (!(tpoll = avahi_threaded_poll_new())) {
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warn("couldn't create avahi threaded tpoll!");
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return -1;
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}
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if (!(client = avahi_client_new(avahi_threaded_poll_get(tpoll),
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0,
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client_callback,
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NULL,
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&err))) {
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warn("couldn't create avahi client: %s!", avahi_strerror(err));
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return -1;
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}
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if (avahi_threaded_poll_start(tpoll) < 0) {
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warn("couldn't start avahi tpoll thread");
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return -1;
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}
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return 0;
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}
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static void avahi_unregister(void) {
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debug(1, "avahi: avahi_unregister\n");
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if (tpoll)
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avahi_threaded_poll_stop(tpoll);
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tpoll = NULL;
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if (name)
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free(name);
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name = NULL;
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}
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mdns_backend mdns_avahi =
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{
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.mdns_register = avahi_register,
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.mdns_unregister = avahi_unregister
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};
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