C++ netconf master Redis plumbing.

node/NetworkConfigMaster.hpp

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+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2011-2015  ZeroTier Networks
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef ZT_NETWORKCONFIGMASTER_HPP
+#define ZT_NETWORKCONFIGMASTER_HPP
+
+#include "Constants.hpp"
+
+#define ZT_ENABLE_NETCONF_MASTER
+
+#ifdef ZT_ENABLE_NETCONF_MASTER
+
+#include <stdint.h>
+#include <string>
+#include <map>
+
+#include "Address.hpp"
+#include "Dictionary.hpp"
+#include "Mutex.hpp"
+
+#include <hiredis/hiredis.h>
+
+namespace ZeroTier {
+
+class RuntimeEnvironment;
+
+/**
+ * Network configuration master -- responds to NETCONF requests
+ *
+ * This requires the 'hiredis' C library to build.
+ */
+class NetworkConfigMaster
+{
+public:
+	/**
+	 * Create netconf master
+	 *
+	 * This doesn't connect to Redis until the first request is received.
+	 *
+	 * @param renv Runtime environment
+	 * @param redisHost Hostname or IP of Redis server
+	 * @param redisPort Redis IP port number
+	 * @param redisPassword Redis AUTH password or NULL if none
+	 * @param redisDatabaseNumber Redis database number (usually 0)
+	 */
+	NetworkConfigMaster(
+		const RuntimeEnvironment *renv,
+		const char *redisHost,
+		unsigned int redisPort,
+		const char *redisPassword,
+		unsigned int redisDatabaseNumber);
+
+	~NetworkConfigMaster();
+
+	/**
+	 * Handle a network config request, sending replies if necessary
+	 *
+	 * This is a blocking call, so rate is limited by Redis. It will fail
+	 * and log its failure if the Redis server is not available or times out.
+	 *
+	 * @param packetId 64-bit packet ID
+	 * @param from Originating peer ZeroTier address
+	 * @param nwid 64-bit network ID
+	 * @param metaData Meta-data bundled with request (empty if none)
+	 * @param haveTimestamp Timestamp requesting peer has or 0 if none or not included
+	 */
+	void doNetworkConfigRequest(
+		uint64_t packetId,
+		const Address &from,
+		uint64_t nwid,
+		const Dictionary &metaData,
+		uint64_t haveTimestamp);
+
+private:
+	// These assume _lock is locked
+	bool _reconnect();
+	bool _hgetall(const char *key,std::map<std::string,std::string> &hdata);
+	bool _hmset(const char *key,const std::map<std::string,std::string> &hdata);
+	bool _hget(const char *key,const char *hashKey,std::string &value);
+	bool _hset(const char *key,const char *hashKey,const char *value);
+
+	Mutex _lock;
+
+	std::string _redisHost;
+	std::string _redisPassword;
+	unsigned int _redisPort;
+	unsigned int _redisDatabaseNumber;
+
+	const RuntimeEnvironment *RR;
+	redisContext *_rc;
+};
+
+} // namespace ZeroTier
+
+#endif // ZT_ENABLE_NETCONF_MASTER
+
+#endif