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-rw-r--r--src/zeroconf/ZeroconfAvahi.cxx279
1 files changed, 279 insertions, 0 deletions
diff --git a/src/zeroconf/ZeroconfAvahi.cxx b/src/zeroconf/ZeroconfAvahi.cxx
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+++ b/src/zeroconf/ZeroconfAvahi.cxx
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+/*
+ * Copyright (C) 2003-2014 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "ZeroconfAvahi.hxx"
+#include "AvahiPoll.hxx"
+#include "ZeroconfInternal.hxx"
+#include "Listen.hxx"
+#include "system/FatalError.hxx"
+#include "util/Domain.hxx"
+#include "Log.hxx"
+
+#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>
+
+#include <dbus/dbus.h>
+
+static constexpr Domain avahi_domain("avahi");
+
+static char *avahiName;
+static bool avahi_running;
+static MyAvahiPoll *avahi_poll;
+static AvahiClient *avahiClient;
+static AvahiEntryGroup *avahiGroup;
+
+static void avahiRegisterService(AvahiClient * c);
+
+/* Callback when the EntryGroup changes state */
+static void avahiGroupCallback(AvahiEntryGroup * g,
+ AvahiEntryGroupState state,
+ gcc_unused void *userdata)
+{
+ char *n;
+ assert(g);
+
+ FormatDebug(avahi_domain,
+ "Service group changed to state %d", state);
+
+ switch (state) {
+ case AVAHI_ENTRY_GROUP_ESTABLISHED:
+ /* The entry group has been established successfully */
+ FormatDefault(avahi_domain,
+ "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;
+
+ FormatDefault(avahi_domain,
+ "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:
+ FormatError(avahi_domain,
+ "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 */
+ avahi_running = false;
+ break;
+
+ case AVAHI_ENTRY_GROUP_UNCOMMITED:
+ LogDebug(avahi_domain, "Service group is UNCOMMITED");
+ break;
+ case AVAHI_ENTRY_GROUP_REGISTERING:
+ LogDebug(avahi_domain, "Service group is REGISTERING");
+ }
+}
+
+/* Registers a new service with avahi */
+static void avahiRegisterService(AvahiClient * c)
+{
+ FormatDebug(avahi_domain, "Registering service %s/%s",
+ SERVICE_TYPE, avahiName);
+
+ int ret;
+ assert(c);
+
+ /* 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, nullptr);
+ if (!avahiGroup) {
+ FormatError(avahi_domain,
+ "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,
+ AvahiPublishFlags(0),
+ avahiName, SERVICE_TYPE, nullptr,
+ nullptr, listen_port, nullptr);
+ if (ret < 0) {
+ FormatError(avahi_domain, "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) {
+ FormatError(avahi_domain, "Failed to commit service group: %s",
+ avahi_strerror(ret));
+ goto fail;
+ }
+ return;
+
+fail:
+ avahi_running = false;
+}
+
+/* Callback when avahi changes state */
+static void avahiClientCallback(AvahiClient * c, AvahiClientState state,
+ gcc_unused void *userdata)
+{
+ int reason;
+ assert(c);
+
+ /* Called whenever the client or server state changes */
+ FormatDebug(avahi_domain, "Client changed to state %d", state);
+
+ switch (state) {
+ case AVAHI_CLIENT_S_RUNNING:
+ LogDebug(avahi_domain, "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) {
+ LogDefault(avahi_domain,
+ "Client Disconnected, will reconnect shortly");
+ if (avahiGroup) {
+ avahi_entry_group_free(avahiGroup);
+ avahiGroup = nullptr;
+ }
+ if (avahiClient)
+ avahi_client_free(avahiClient);
+ avahiClient =
+ avahi_client_new(avahi_poll,
+ AVAHI_CLIENT_NO_FAIL,
+ avahiClientCallback, nullptr,
+ &reason);
+ if (!avahiClient) {
+ FormatWarning(avahi_domain,
+ "Could not reconnect: %s",
+ avahi_strerror(reason));
+ avahi_running = false;
+ }
+ } else {
+ FormatWarning(avahi_domain,
+ "Client failure: %s (terminal)",
+ avahi_strerror(reason));
+ avahi_running = false;
+ }
+ break;
+
+ case AVAHI_CLIENT_S_COLLISION:
+ LogDebug(avahi_domain, "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) {
+ LogDebug(avahi_domain, "Resetting group");
+ avahi_entry_group_reset(avahiGroup);
+ }
+
+ break;
+
+ case AVAHI_CLIENT_S_REGISTERING:
+ LogDebug(avahi_domain, "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) {
+ LogDebug(avahi_domain, "Resetting group");
+ avahi_entry_group_reset(avahiGroup);
+ }
+
+ break;
+
+ case AVAHI_CLIENT_CONNECTING:
+ LogDebug(avahi_domain, "Client is CONNECTING");
+ break;
+ }
+}
+
+void
+AvahiInit(EventLoop &loop, const char *serviceName)
+{
+ LogDebug(avahi_domain, "Initializing interface");
+
+ if (!avahi_is_valid_service_name(serviceName))
+ FormatFatalError("Invalid zeroconf_name \"%s\"", serviceName);
+
+ avahiName = avahi_strdup(serviceName);
+
+ avahi_running = true;
+
+ avahi_poll = new MyAvahiPoll(loop);
+
+ int error;
+ avahiClient = avahi_client_new(avahi_poll, AVAHI_CLIENT_NO_FAIL,
+ avahiClientCallback, nullptr, &error);
+
+ if (!avahiClient) {
+ FormatError(avahi_domain, "Failed to create client: %s",
+ avahi_strerror(error));
+ AvahiDeinit();
+ }
+}
+
+void
+AvahiDeinit(void)
+{
+ LogDebug(avahi_domain, "Shutting down interface");
+
+ if (avahiGroup) {
+ avahi_entry_group_free(avahiGroup);
+ avahiGroup = nullptr;
+ }
+
+ if (avahiClient) {
+ avahi_client_free(avahiClient);
+ avahiClient = nullptr;
+ }
+
+ delete avahi_poll;
+ avahi_poll = nullptr;
+
+ avahi_free(avahiName);
+ avahiName = nullptr;
+
+ dbus_shutdown();
+}