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-rw-r--r--trunk/src/zeroconf.c498
1 files changed, 498 insertions, 0 deletions
diff --git a/trunk/src/zeroconf.c b/trunk/src/zeroconf.c
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index 000000000..eeec794cd
--- /dev/null
+++ b/trunk/src/zeroconf.c
@@ -0,0 +1,498 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+
+#include "zeroconf.h"
+#include "conf.h"
+#include "log.h"
+#include "listen.h"
+#include "ioops.h"
+#include "utils.h"
+
+/* The dns-sd service type qualifier to publish */
+#define SERVICE_TYPE "_mpd._tcp"
+
+/* The default service name to publish
+ * (overridden by 'zeroconf_name' config parameter)
+ */
+#define SERVICE_NAME "Music Player"
+
+/* Here is the implementation for Avahi (http://avahi.org) Zeroconf support */
+#ifdef HAVE_AVAHI
+
+#include <avahi-client/client.h>
+#include <avahi-client/publish.h>
+
+#include <avahi-common/alternative.h>
+#include <avahi-common/domain.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/error.h>
+
+/* Static avahi data */
+static AvahiEntryGroup *avahiGroup;
+static char *avahiName;
+static AvahiClient* avahiClient;
+static AvahiPoll avahiPoll;
+static int avahiRunning;
+
+static int avahiFdset( fd_set* rfds, fd_set* wfds, fd_set* efds );
+static int avahiFdconsume( int fdCount, fd_set* rfds, fd_set* wfds, fd_set* efds );
+static struct ioOps avahiIo = {
+ .fdset = avahiFdset,
+ .consume = avahiFdconsume,
+};
+
+/* Forward Declaration */
+static void avahiRegisterService(AvahiClient *c);
+
+struct AvahiWatch {
+ struct AvahiWatch* prev;
+ struct AvahiWatch* next;
+ int fd;
+ AvahiWatchEvent requestedEvent;
+ AvahiWatchEvent observedEvent;
+ AvahiWatchCallback callback;
+ void* userdata;
+};
+
+struct AvahiTimeout {
+ struct AvahiTimeout* prev;
+ struct AvahiTimeout* next;
+ struct timeval expiry;
+ int enabled;
+ AvahiTimeoutCallback callback;
+ void* userdata;
+};
+
+static AvahiWatch* avahiWatchList;
+static AvahiTimeout* avahiTimeoutList;
+
+static AvahiWatch* avahiWatchNew( const AvahiPoll *api, int fd, AvahiWatchEvent event, AvahiWatchCallback callback, void *userdata )
+{
+ struct AvahiWatch* newWatch = xmalloc( sizeof(struct AvahiWatch) );
+
+ newWatch->fd = fd;
+ newWatch->requestedEvent = event;
+ newWatch->observedEvent = 0;
+ newWatch->callback = callback;
+ newWatch->userdata = userdata;
+
+ /* Insert at front of list */
+ newWatch->next = avahiWatchList;
+ avahiWatchList = newWatch;
+ newWatch->prev = NULL;
+ if( newWatch->next )
+ newWatch->next->prev = newWatch;
+
+ return newWatch;
+}
+
+static void avahiWatchUpdate( AvahiWatch *w, AvahiWatchEvent event )
+{
+ assert( w != NULL );
+ w->requestedEvent = event;
+}
+
+static AvahiWatchEvent avahiWatchGetEvents( AvahiWatch *w )
+{
+ assert( w != NULL );
+ return w->observedEvent;
+}
+
+static void avahiWatchFree( AvahiWatch *w )
+{
+ assert( w != NULL );
+
+ if( avahiWatchList == w )
+ avahiWatchList = w->next;
+ else if( w->prev != NULL )
+ w->prev->next = w->next;
+
+ free( w );
+}
+
+static void avahiCheckExpiry( AvahiTimeout *t )
+{
+ assert( t != NULL );
+ if( t->enabled ) {
+ struct timeval now;
+ gettimeofday( &now, NULL );
+ if( timercmp( &now, &(t->expiry), > ) ) {
+ t->enabled = 0;
+ t->callback( t, t->userdata );
+ }
+ }
+}
+
+static void avahiTimeoutUpdate( AvahiTimeout *t, const struct timeval *tv )
+{
+ assert( t != NULL );
+ if( tv ) {
+ t->enabled = 1;
+ t->expiry.tv_sec = tv->tv_sec;
+ t->expiry.tv_usec = tv->tv_usec;
+ } else {
+ t->enabled = 0;
+ }
+}
+
+static void avahiTimeoutFree( AvahiTimeout *t )
+{
+ assert( t != NULL );
+
+ if( avahiTimeoutList == t )
+ avahiTimeoutList = t->next;
+ else if( t->prev != NULL )
+ t->prev->next = t->next;
+
+ free( t );
+}
+
+static AvahiTimeout* avahiTimeoutNew( const AvahiPoll *api, const struct timeval *tv, AvahiTimeoutCallback callback, void *userdata )
+{
+ struct AvahiTimeout* newTimeout = xmalloc( sizeof(struct AvahiTimeout) );
+
+ newTimeout->callback = callback;
+ newTimeout->userdata = userdata;
+
+ avahiTimeoutUpdate( newTimeout, tv );
+
+ /* Insert at front of list */
+ newTimeout->next = avahiTimeoutList;
+ avahiTimeoutList = newTimeout;
+ newTimeout->prev = NULL;
+ if( newTimeout->next )
+ newTimeout->next->prev = newTimeout;
+
+ return newTimeout;
+}
+
+/* Callback when the EntryGroup changes state */
+static void avahiGroupCallback(
+ AvahiEntryGroup *g,
+ AvahiEntryGroupState state,
+ void *userdata)
+{
+ assert(g);
+
+ DEBUG( "Avahi: Service group changed to state %d\n", state );
+
+ switch (state) {
+ case AVAHI_ENTRY_GROUP_ESTABLISHED :
+ /* The entry group has been established successfully */
+ LOG( "Avahi: Service '%s' successfully established.\n", avahiName );
+ break;
+
+ case AVAHI_ENTRY_GROUP_COLLISION : {
+ char *n;
+
+ /* A service name collision happened. Let's pick a new name */
+ n = avahi_alternative_service_name(avahiName);
+ avahi_free(avahiName);
+ avahiName = n;
+
+ LOG( "Avahi: Service name collision, renaming service to '%s'\n", avahiName );
+
+ /* And recreate the services */
+ avahiRegisterService(avahi_entry_group_get_client(g));
+ break;
+ }
+
+ case AVAHI_ENTRY_GROUP_FAILURE :
+ ERROR( "Avahi: Entry group failure: %s\n",
+ avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))) );
+ /* Some kind of failure happened while we were registering our services */
+ avahiRunning = 0;
+ break;
+
+ case AVAHI_ENTRY_GROUP_UNCOMMITED:
+ DEBUG( "Avahi: Service group is UNCOMMITED\n" );
+ break;
+ case AVAHI_ENTRY_GROUP_REGISTERING:
+ DEBUG( "Avahi: Service group is REGISTERING\n" );
+ ;
+ }
+}
+
+/* Registers a new service with avahi */
+static void avahiRegisterService(AvahiClient *c)
+{
+ int ret;
+ assert(c);
+ DEBUG( "Avahi: Registering service %s/%s\n", SERVICE_TYPE, avahiName );
+
+ /* If this is the first time we're called, let's create a new entry group */
+ if (!avahiGroup) {
+ avahiGroup = avahi_entry_group_new(c, avahiGroupCallback, NULL);
+ if( !avahiGroup ) {
+ ERROR( "Avahi: Failed to create avahi EntryGroup: %s\n", avahi_strerror(avahi_client_errno(c)) );
+ goto fail;
+ }
+ }
+
+ /* Add the service */
+ /* TODO: This currently binds to ALL interfaces.
+ * We could maybe add a service per actual bound interface, if that's better. */
+ ret = avahi_entry_group_add_service(avahiGroup,
+ AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0,
+ avahiName, SERVICE_TYPE,
+ NULL, NULL,
+ getBoundPort(),
+ NULL);
+ if( ret < 0 ) {
+ ERROR( "Avahi: Failed to add service %s: %s\n", SERVICE_TYPE, avahi_strerror(ret) );
+ goto fail;
+ }
+
+ /* Tell the server to register the service group */
+ ret = avahi_entry_group_commit(avahiGroup);
+ if( ret < 0 ) {
+ ERROR( "Avahi: Failed to commit service group: %s\n", avahi_strerror(ret) );
+ goto fail;
+ }
+ return;
+
+fail:
+ avahiRunning = 0;
+}
+
+/* Callback when avahi changes state */
+static void avahiClientCallback(AvahiClient *c, AvahiClientState state, void *userdata)
+{
+ assert(c);
+
+ /* Called whenever the client or server state changes */
+ DEBUG( "Avahi: Client changed to state %d\n", state );
+
+ switch (state) {
+ case AVAHI_CLIENT_S_RUNNING:
+ DEBUG( "Avahi: Client is RUNNING\n" );
+
+ /* The server has startup successfully and registered its host
+ * name on the network, so it's time to create our services */
+ if (!avahiGroup)
+ avahiRegisterService(c);
+ break;
+
+ case AVAHI_CLIENT_FAILURE:
+ {
+ int reason = avahi_client_errno(c);
+ if( reason == AVAHI_ERR_DISCONNECTED ) {
+ LOG( "Avahi: Client Disconnected, will reconnect shortly\n");
+ avahi_entry_group_free( avahiGroup );
+ avahiGroup = NULL;
+ avahi_client_free( avahiClient );
+ avahiClient = NULL;
+ avahiClient = avahi_client_new( &avahiPoll, AVAHI_CLIENT_NO_FAIL,
+ avahiClientCallback, NULL, &reason );
+ if( !avahiClient ) {
+ ERROR( "Avahi: Could not reconnect: %s\n", avahi_strerror(reason) );
+ avahiRunning = 0;
+ }
+ } else {
+ ERROR( "Avahi: Client failure: %s (terminal)\n", avahi_strerror(reason));
+ avahiRunning = 0;
+ }
+ }
+ break;
+
+ case AVAHI_CLIENT_S_COLLISION:
+ DEBUG( "Avahi: Client is COLLISION\n" );
+ /* Let's drop our registered services. When the server is back
+ * in AVAHI_SERVER_RUNNING state we will register them
+ * again with the new host name. */
+ if (avahiGroup) {
+ DEBUG( "Avahi: Resetting group\n" );
+ avahi_entry_group_reset(avahiGroup);
+ }
+
+ case AVAHI_CLIENT_S_REGISTERING:
+ DEBUG( "Avahi: Client is REGISTERING\n" );
+ /* The server records are now being established. This
+ * might be caused by a host name change. We need to wait
+ * for our own records to register until the host name is
+ * properly esatblished. */
+
+ if (avahiGroup) {
+ DEBUG( "Avahi: Resetting group\n" );
+ avahi_entry_group_reset(avahiGroup);
+ }
+
+ break;
+
+ case AVAHI_CLIENT_CONNECTING:
+ DEBUG( "Avahi: Client is CONNECTING\n" );
+ ;
+ }
+}
+
+static int avahiFdset( fd_set* rfds, fd_set* wfds, fd_set* efds )
+{
+ AvahiWatch* w;
+ int maxfd = -1;
+ if( !avahiRunning )
+ return maxfd;
+ for( w = avahiWatchList; w != NULL; w = w->next ) {
+ if( w->requestedEvent & AVAHI_WATCH_IN ) {
+ FD_SET( w->fd, rfds );
+ }
+ if( w->requestedEvent & AVAHI_WATCH_OUT ) {
+ FD_SET( w->fd, wfds );
+ }
+ if( w->requestedEvent & AVAHI_WATCH_ERR ) {
+ FD_SET( w->fd, efds );
+ }
+ if( w->requestedEvent & AVAHI_WATCH_HUP ) {
+ ERROR( "Avahi: No support for HUP events! (ignoring)\n" );
+ }
+
+ if( w->fd > maxfd )
+ maxfd = w->fd;
+ }
+ return maxfd;
+}
+
+static int avahiFdconsume( int fdCount, fd_set* rfds, fd_set* wfds, fd_set* efds )
+{
+ int retval = fdCount;
+ AvahiTimeout* t;
+ AvahiWatch* w = avahiWatchList;
+
+ while( w != NULL && retval > 0 ) {
+ AvahiWatch* current = w;
+ current->observedEvent = 0;
+ if( FD_ISSET( current->fd, rfds ) ) {
+ current->observedEvent |= AVAHI_WATCH_IN;
+ FD_CLR( current->fd, rfds );
+ retval--;
+ }
+ if( FD_ISSET( current->fd, wfds ) ) {
+ current->observedEvent |= AVAHI_WATCH_OUT;
+ FD_CLR( current->fd, wfds );
+ retval--;
+ }
+ if( FD_ISSET( current->fd, efds ) ) {
+ current->observedEvent |= AVAHI_WATCH_ERR;
+ FD_CLR( current->fd, efds );
+ retval--;
+ }
+
+ /* Advance to the next one right now, in case the callback
+ * removes itself
+ */
+ w = w->next;
+
+ if( current->observedEvent && avahiRunning ) {
+ current->callback( current, current->fd,
+ current->observedEvent, current->userdata );
+ }
+ }
+
+ t = avahiTimeoutList;
+ while( t != NULL && avahiRunning ) {
+ AvahiTimeout* current = t;
+
+ /* Advance to the next one right now, in case the callback
+ * removes itself
+ */
+ t = t->next;
+ avahiCheckExpiry( current );
+ }
+
+ return retval;
+}
+
+static void init_avahi(const char *serviceName)
+{
+ int error;
+ DEBUG( "Avahi: Initializing interface\n" );
+
+ if( avahi_is_valid_service_name( serviceName ) ) {
+ avahiName = avahi_strdup( serviceName );
+ } else {
+ ERROR( "Invalid zeroconf_name \"%s\", defaulting to \"%s\" instead.\n", serviceName, SERVICE_NAME );
+ avahiName = avahi_strdup( SERVICE_NAME );
+ }
+
+ avahiRunning = 1;
+
+ avahiPoll.userdata = NULL;
+ avahiPoll.watch_new = avahiWatchNew;
+ avahiPoll.watch_update = avahiWatchUpdate;
+ avahiPoll.watch_get_events = avahiWatchGetEvents;
+ avahiPoll.watch_free = avahiWatchFree;
+ avahiPoll.timeout_new = avahiTimeoutNew;
+ avahiPoll.timeout_update = avahiTimeoutUpdate;
+ avahiPoll.timeout_free = avahiTimeoutFree;
+
+ avahiClient = avahi_client_new( &avahiPoll, AVAHI_CLIENT_NO_FAIL,
+ avahiClientCallback, NULL, &error );
+
+ if( !avahiClient ) {
+ ERROR( "Avahi: Failed to create client: %s\n", avahi_strerror(error) );
+ goto fail;
+ }
+
+ avahiIo.fdset = avahiFdset;
+ avahiIo.consume = avahiFdconsume;
+ registerIO( &avahiIo );
+
+ return;
+
+fail:
+ finishZeroconf();
+}
+#else /* !HAVE_AVAHI */
+static void init_avahi(const char *serviceName) { }
+#endif /* HAVE_AVAHI */
+
+void initZeroconf(void)
+{
+ const char* serviceName = SERVICE_NAME;
+ ConfigParam *param;
+
+ param = getConfigParam(CONF_ZEROCONF_NAME);
+
+ if (param && strlen(param->value) > 0)
+ serviceName = param->value;
+ init_avahi(serviceName);
+}
+
+void finishZeroconf(void)
+{
+#ifdef HAVE_AVAHI
+ DEBUG( "Avahi: Shutting down interface\n" );
+ deregisterIO( &avahiIo );
+
+ if( avahiGroup ) {
+ avahi_entry_group_free( avahiGroup );
+ avahiGroup = NULL;
+ }
+
+ if( avahiClient ) {
+ avahi_client_free( avahiClient );
+ avahiClient = NULL;
+ }
+
+ avahi_free( avahiName );
+ avahiName = NULL;
+#endif /* HAVE_AVAHI */
+}
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