src: Reorganizing source code in preparation to merge NRD code

Note that as of this commit, there are several changes in location of
compiled binaries in `build/` folder:

* `nfd` has been moved to `build/bin/nfd`
* `unit-tests` has been split into `unit-tests-core` and `unit-tests-daemon`

Change-Id: I2c830c117879edbaa5457d6423c13f0273285919
Refs: #1486
diff --git a/core/network-interface.hpp b/core/network-interface.hpp
new file mode 100644
index 0000000..08824fa
--- /dev/null
+++ b/core/network-interface.hpp
@@ -0,0 +1,90 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  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
+ *
+ * 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/>.
+ **/
+
+#ifndef NFD_CORE_NETWORK_INTERFACE_HPP
+#define NFD_CORE_NETWORK_INTERFACE_HPP
+
+#include "common.hpp"
+#include "ethernet.hpp"
+
+#include <net/if.h>
+
+namespace nfd {
+
+class NetworkInterfaceInfo
+{
+public:
+
+  int index;
+  std::string name;
+  ethernet::Address etherAddress;
+  std::vector<boost::asio::ip::address_v4> ipv4Addresses;
+  std::vector<boost::asio::ip::address_v6> ipv6Addresses;
+  boost::asio::ip::address_v4 broadcastAddress;
+  unsigned int flags;
+
+  bool
+  isLoopback() const;
+
+  bool
+  isMulticastCapable() const;
+
+  bool
+  isBroadcastCapable() const;
+
+  bool
+  isUp() const;
+
+};
+
+inline bool
+NetworkInterfaceInfo::isLoopback() const
+{
+  return (flags & IFF_LOOPBACK) != 0;
+}
+
+inline bool
+NetworkInterfaceInfo::isMulticastCapable() const
+{
+  return (flags & IFF_MULTICAST) != 0;
+}
+
+inline bool
+NetworkInterfaceInfo::isBroadcastCapable() const
+{
+  return (flags & IFF_BROADCAST) != 0;
+}
+
+inline bool
+NetworkInterfaceInfo::isUp() const
+{
+  return (flags & IFF_UP) != 0;
+}
+
+std::list< shared_ptr<NetworkInterfaceInfo> >
+listNetworkInterfaces();
+
+} // namespace nfd
+
+#endif // NFD_CORE_NETWORK_INTERFACE_HPP