Implement HostPortAllocator.

remoting/host/network_settings.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef REMOTING_HOST_NETWORK_SETTINGS_H_
+#define REMOTING_HOST_NETWORK_SETTINGS_H_
+
+namespace remoting {
+
+struct NetworkSettings {
+  enum NatTraversalMode {
+    // Don't use STUN or relay servers. Accept incoming P2P connection
+    // attempts, but don't initiate any. This ensures that the peer is
+    // on the same network. Note that connection will always fail if
+    // both ends use this mode.
+    NAT_TRAVERSAL_DISABLED,
+
+    // Don't use STUN or relay servers but make outgoing connections.
+    NAT_TRAVERSAL_OUTGOING,
+
+    // Active NAT traversal using STUN and relay servers.
+    NAT_TRAVERSAL_ENABLED,

[Wez, 2012/04/27 23:23:21]

nit: Consider re-ordering these so that ENABLED appears first, since it's the
most common configuration.

[Sergey Ulanov, 2012/04/28 00:05:27]

Done.

+  };
+
+  NetworkSettings()
+      : nat_traversal_mode(NAT_TRAVERSAL_DISABLED),
+        min_port(0),
+        max_port(0) {
+  }
+
+  explicit NetworkSettings(bool allow_nat_traversal)
+      : nat_traversal_mode(allow_nat_traversal ?
+                           NAT_TRAVERSAL_ENABLED :
+                           NAT_TRAVERSAL_DISABLED),
+        min_port(0),
+        max_port(0) {

[Wez, 2012/04/27 23:23:21]

Can we do without this ugly ctor, please? :)

[Sergey Ulanov, 2012/04/28 00:05:27]

Done.

+  }
+
+  explicit NetworkSettings(NatTraversalMode nat_traversal_mode)
+      : nat_traversal_mode(nat_traversal_mode),
+        min_port(0),
+        max_port(0) {
+  }
+
+  NatTraversalMode nat_traversal_mode;
+
+  // |min_port| and |max_port| specify range (inclusive) of ports used by
+  // P2P sessions. Any port can be used when both values are set to 0.
+  int min_port;
+  int max_port;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_NETWORK_SETTINGS_H_