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-rw-r--r--src/zeroconf-avahi.c480
1 files changed, 480 insertions, 0 deletions
diff --git a/src/zeroconf-avahi.c b/src/zeroconf-avahi.c
new file mode 100644
index 000000000..688e2ab24
--- /dev/null
+++ b/src/zeroconf-avahi.c
@@ -0,0 +1,480 @@
+/*
+ * Copyright (C) 2003-2008 The Music Player Daemon Project
+ * 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 "zeroconf-internal.h"
+#include "listen.h"
+#include "utils.h"
+#include "ioops.h"
+
+#include <glib.h>
+
+#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>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "avahi"
+
+static struct ioOps zeroConfIo;
+
+static char *avahiName;
+static int avahiRunning;
+static AvahiPoll avahiPoll;
+static AvahiClient *avahiClient;
+static AvahiEntryGroup *avahiGroup;
+
+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);
+
+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(G_GNUC_UNUSED 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(G_GNUC_UNUSED 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;
+}
+
+static void avahiRegisterService(AvahiClient * c);
+
+/* Callback when the EntryGroup changes state */
+static void avahiGroupCallback(AvahiEntryGroup * g,
+ AvahiEntryGroupState state,
+ G_GNUC_UNUSED void *userdata)
+{
+ char *n;
+ assert(g);
+
+ g_debug("Service group changed to state %d", state);
+
+ switch (state) {
+ case AVAHI_ENTRY_GROUP_ESTABLISHED:
+ /* The entry group has been established successfully */
+ g_message("Service '%s' successfully established.",
+ avahiName);
+ break;
+
+ case AVAHI_ENTRY_GROUP_COLLISION:
+ /* A service name collision happened. Let's pick a new name */
+ n = avahi_alternative_service_name(avahiName);
+ avahi_free(avahiName);
+ avahiName = n;
+
+ g_message("Service name collision, renaming service to '%s'",
+ avahiName);
+
+ /* And recreate the services */
+ avahiRegisterService(avahi_entry_group_get_client(g));
+ break;
+
+ case AVAHI_ENTRY_GROUP_FAILURE:
+ g_warning("Entry group failure: %s",
+ 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:
+ g_debug("Service group is UNCOMMITED");
+ break;
+ case AVAHI_ENTRY_GROUP_REGISTERING:
+ g_debug("Service group is REGISTERING");
+ }
+}
+
+/* Registers a new service with avahi */
+static void avahiRegisterService(AvahiClient * c)
+{
+ int ret;
+ assert(c);
+ g_debug("Registering service %s/%s", 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) {
+ g_warning("Failed to create avahi EntryGroup: %s",
+ 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, boundPort, NULL);
+ if (ret < 0) {
+ g_warning("Failed to add service %s: %s", SERVICE_TYPE,
+ avahi_strerror(ret));
+ goto fail;
+ }
+
+ /* Tell the server to register the service group */
+ ret = avahi_entry_group_commit(avahiGroup);
+ if (ret < 0) {
+ g_warning("Failed to commit service group: %s",
+ avahi_strerror(ret));
+ goto fail;
+ }
+ return;
+
+fail:
+ avahiRunning = 0;
+}
+
+/* Callback when avahi changes state */
+static void avahiClientCallback(AvahiClient * c, AvahiClientState state,
+ G_GNUC_UNUSED void *userdata)
+{
+ int reason;
+ assert(c);
+
+ /* Called whenever the client or server state changes */
+ g_debug("Client changed to state %d", state);
+
+ switch (state) {
+ case AVAHI_CLIENT_S_RUNNING:
+ g_debug("Client is RUNNING");
+
+ /* 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:
+ reason = avahi_client_errno(c);
+ if (reason == AVAHI_ERR_DISCONNECTED) {
+ g_message("Client Disconnected, will reconnect shortly");
+ if (avahiGroup) {
+ avahi_entry_group_free(avahiGroup);
+ avahiGroup = NULL;
+ }
+ if (avahiClient)
+ avahi_client_free(avahiClient);
+ avahiClient =
+ avahi_client_new(&avahiPoll,
+ AVAHI_CLIENT_NO_FAIL,
+ avahiClientCallback, NULL,
+ &reason);
+ if (!avahiClient) {
+ g_warning("Could not reconnect: %s",
+ avahi_strerror(reason));
+ avahiRunning = 0;
+ }
+ } else {
+ g_warning("Client failure: %s (terminal)",
+ avahi_strerror(reason));
+ avahiRunning = 0;
+ }
+ break;
+
+ case AVAHI_CLIENT_S_COLLISION:
+ g_debug("Client is COLLISION");
+ /* 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) {
+ g_debug("Resetting group");
+ avahi_entry_group_reset(avahiGroup);
+ }
+
+ case AVAHI_CLIENT_S_REGISTERING:
+ g_debug("Client is REGISTERING");
+ /* 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) {
+ g_debug("Resetting group");
+ avahi_entry_group_reset(avahiGroup);
+ }
+
+ break;
+
+ case AVAHI_CLIENT_CONNECTING:
+ g_debug("Client is CONNECTING");
+ }
+}
+
+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) {
+ g_warning("No support for HUP events! (ignoring)");
+ }
+
+ 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;
+}
+
+void init_avahi(const char *serviceName)
+{
+ int error;
+ g_debug("Initializing interface");
+
+ if (!avahi_is_valid_service_name(serviceName))
+ g_error("Invalid zeroconf_name \"%s\"", serviceName);
+
+ avahiName = avahi_strdup(serviceName);
+
+ 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) {
+ g_warning("Failed to create client: %s",
+ avahi_strerror(error));
+ goto fail;
+ }
+
+ zeroConfIo.fdset = avahiFdset;
+ zeroConfIo.consume = avahiFdconsume;
+ registerIO(&zeroConfIo);
+
+ return;
+
+fail:
+ avahi_finish();
+}
+
+void avahi_finish(void)
+{
+ g_debug("Shutting down interface");
+ deregisterIO(&zeroConfIo);
+
+ if (avahiGroup) {
+ avahi_entry_group_free(avahiGroup);
+ avahiGroup = NULL;
+ }
+
+ if (avahiClient) {
+ avahi_client_free(avahiClient);
+ avahiClient = NULL;
+ }
+
+ avahi_free(avahiName);
+ avahiName = NULL;
+}
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