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+/*
+ *  anytun
+ *
+ *  The secure anycast tunneling protocol (satp) defines a protocol used
+ *  for communication between any combination of unicast and anycast
+ *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
+ *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
+ *  ethernet, ip, arp ...). satp directly includes cryptography and
+ *  message authentication based on the methodes used by SRTP.  It is
+ *  intended to deliver a generic, scaleable and secure solution for
+ *  tunneling and relaying of packets of any protocol.
+ *
+ *
+ *  Copyright (C) 2007-2008 Othmar Gsenger, Erwin Nindl, 
+ *                          Christian Pointner <satp@wirdorange.org>
+ *
+ *  This file is part of Anytun.
+ *
+ *  Anytun is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 3 as
+ *  published by the Free Software Foundation.
+ *
+ *  Anytun 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 anytun.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _RESOLVER_H_
+#define _RESOLVER_H_
+
+#include <queue>
+#include <boost/asio.hpp>
+
+#include "threadUtils.hpp"
+
+template<class Proto>
+class ResolveHandler
+{
+public:
+  ResolveHandler(const std::string& addr, const std::string& port);
+  void operator()(const boost::system::error_code& e, const boost::asio::ip::basic_resolver_iterator<Proto>);
+
+private:
+  std::string addr_;
+  std::string port_;
+};
+
+typedef ResolveHandler<boost::asio::ip::udp> UdpResolveHandler;
+typedef ResolveHandler<boost::asio::ip::tcp> TcpResolveHandler;
+
+class Resolver 
+{
+public:
+  static Resolver& instance();
+
+  void init();
+  static void run(void* s);
+
+  void resolveUdp(const std::string& addr, const std::string& port);
+  void resolveTcp(const std::string& addr, const std::string& port);
+
+private:
+  Resolver();
+  ~Resolver();
+  Resolver(const Resolver &r);
+  void operator=(const Resolver &r);
+
+  static Resolver* inst;
+  static ::Mutex instMutex;
+  class instanceCleaner {
+    public: ~instanceCleaner() {
+      if(Resolver::inst != 0)
+        delete Resolver::inst;
+    }
+  };
+  friend class instanceCleaner;
+
+  boost::asio::io_service io_service_;
+  boost::asio::ip::udp::resolver udp_resolver_;
+  boost::asio::ip::tcp::resolver tcp_resolver_;
+  boost::thread* thread_;
+};
+
+extern Resolver& gResolver;
+
+#endif