1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef REMOTING_JINGLE_GLUE_NETWORK_SETTINGS_H_
6#define REMOTING_JINGLE_GLUE_NETWORK_SETTINGS_H_
7
8#include <string>
9
10#include "base/basictypes.h"
11#include "base/logging.h"
12
13namespace remoting {
14
15struct NetworkSettings {
16
17  // When hosts are configured with NAT traversal disabled they will
18  // typically also limit their P2P ports to this range, so that
19  // sessions may be blocked or un-blocked via firewall rules.
20  static const int kDefaultMinPort = 12400;
21  static const int kDefaultMaxPort = 12409;
22
23  enum Flags {
24    // Don't use STUN or relay servers. Accept incoming P2P connection
25    // attempts, but don't initiate any. This ensures that the peer is
26    // on the same network. Note that connection will always fail if
27    // both ends use this mode.
28    NAT_TRAVERSAL_DISABLED = 0x0,
29
30    // Allow outgoing connections, even when STUN and RELAY are not enabled.
31    NAT_TRAVERSAL_OUTGOING = 0x1,
32
33    // Active NAT traversal using STUN.
34    NAT_TRAVERSAL_STUN = 0x2,
35
36    // Allow the use of relay servers when a direct connection is not available.
37    NAT_TRAVERSAL_RELAY = 0x4,
38
39    // Active NAT traversal using STUN and relay servers.
40    NAT_TRAVERSAL_FULL = NAT_TRAVERSAL_STUN | NAT_TRAVERSAL_RELAY |
41        NAT_TRAVERSAL_OUTGOING
42  };
43
44  NetworkSettings()
45      : flags(NAT_TRAVERSAL_DISABLED),
46        min_port(0),
47        max_port(0) {
48    DCHECK(!(flags & (NAT_TRAVERSAL_STUN | NAT_TRAVERSAL_RELAY)) ||
49           (flags & NAT_TRAVERSAL_OUTGOING));
50  }
51
52  explicit NetworkSettings(uint32 flags)
53      : flags(flags),
54        min_port(0),
55        max_port(0) {
56  }
57
58  // Parse string in the form "<min_port>-<max_port>". E.g. "12400-12409".
59  // Returns true if string was parsed successfuly.
60  static bool ParsePortRange(const std::string& port_range,
61                             int* out_min_port,
62                             int* out_max_port);
63
64  uint32 flags;
65
66  // |min_port| and |max_port| specify range (inclusive) of ports used by
67  // P2P sessions. Any port can be used when both values are set to 0.
68  int min_port;
69  int max_port;
70};
71
72}  // namespace remoting
73
74#endif  // REMOTING_HOST_NETWORK_SETTINGS_H_
75