face: process face_system.ether config section in EthernetFactory

This commit also fixes a potential memory access error in EthernetTransport.

refs #3904

Change-Id: I08296e7c6f1039b59b2859d277fc95326af34f52
diff --git a/tests/daemon/face/ethernet-fixture.hpp b/tests/daemon/face/ethernet-fixture.hpp
new file mode 100644
index 0000000..4228f79
--- /dev/null
+++ b/tests/daemon/face/ethernet-fixture.hpp
@@ -0,0 +1,75 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2017,  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/>.
+ */
+
+#ifndef NFD_TESTS_DAEMON_FACE_ETHERNET_FIXTURE_HPP
+#define NFD_TESTS_DAEMON_FACE_ETHERNET_FIXTURE_HPP
+
+#include "core/network-interface.hpp"
+#include "face/ethernet-transport.hpp"
+
+#include "test-common.hpp"
+
+namespace nfd {
+namespace face {
+namespace tests {
+
+class EthernetFixture : public virtual nfd::tests::BaseFixture
+{
+protected:
+  EthernetFixture()
+  {
+    for (const auto& netif : listNetworkInterfaces()) {
+      if (!netif.isLoopback() && netif.isUp()) {
+        try {
+          EthernetTransport transport(netif, ethernet::getBroadcastAddress());
+          netifs.push_back(netif);
+        }
+        catch (const EthernetTransport::Error&) {
+          // ignore
+        }
+      }
+    }
+  }
+
+protected:
+  /** \brief EthernetTransport-capable network interfaces
+   */
+  std::vector<NetworkInterfaceInfo> netifs;
+};
+
+#define SKIP_IF_ETHERNET_NETIF_COUNT_LT(n) \
+  do { \
+    if (this->netifs.size() < (n)) { \
+      BOOST_WARN_MESSAGE(false, "skipping assertions that require " #n \
+                                " or more EthernetTransport-capable network interfaces"); \
+      return; \
+    } \
+  } while (false)
+
+} // namespace tests
+} // namespace face
+} // namespace nfd
+
+#endif // NFD_TESTS_DAEMON_FACE_ETHERNET_FIXTURE_HPP