tools: Refactoring ndn-autoconfig implementation

Change-Id: Ib92942ba40f04aaee83479177b9ba5d32a09af04
Refs: #2421
diff --git a/tools/ndn-autoconfig/guess-from-identity-name.cpp b/tools/ndn-autoconfig/guess-from-identity-name.cpp
new file mode 100644
index 0000000..5a6df3e
--- /dev/null
+++ b/tools/ndn-autoconfig/guess-from-identity-name.cpp
@@ -0,0 +1,63 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "guess-from-identity-name.hpp"
+
+namespace ndn {
+namespace tools {
+namespace autoconfig {
+
+GuessFromIdentityName::GuessFromIdentityName(Face& face, KeyChain& keyChain,
+                                             const NextStageCallback& nextStageOnFailure)
+  : BaseDns(face, keyChain, nextStageOnFailure)
+{
+}
+
+void
+GuessFromIdentityName::start()
+{
+  std::cerr << "Trying to find home router based on the default identity name..." << std::endl;
+
+  Name identity = m_keyChain.getDefaultIdentity();
+
+  std::ostringstream serverName;
+  for (auto i = identity.rbegin(); i != identity.rend(); ++i) {
+    serverName << i->toUri() << ".";
+  }
+  serverName << "_homehub._autoconf.named-data.net";
+
+  try {
+    std::string hubUri = BaseDns::querySrvRr(serverName.str());
+    this->connectToHub(hubUri);
+  }
+  catch (const BaseDns::Error& e) {
+    m_nextStageOnFailure(std::string("Failed to find a home router based on the default identity "
+                                     "name (") + e.what() + ")");
+  }
+}
+
+} // namespace autoconfig
+} // namespace tools
+} // namespace ndn