1 files changed, 275 insertions, 0 deletions
diff --git a/src/zeroconf/ZeroconfAvahi.cxx b/src/zeroconf/ZeroconfAvahi.cxx
new file mode 100644
index 000000000..8cd09cbed
--- /dev/null
+++ b/src/zeroconf/ZeroconfAvahi.cxx
@@ -0,0 +1,275 @@
+/*
+ * 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>
+
+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;
+}