1 /* 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <assert.h> 12 13 #include "webrtc/base/nattypes.h" 14 15 namespace rtc { 16 17 class SymmetricNAT : public NAT { 18 public: 19 bool IsSymmetric() override { return true; } 20 bool FiltersIP() override { return true; } 21 bool FiltersPort() override { return true; } 22 }; 23 24 class OpenConeNAT : public NAT { 25 public: 26 bool IsSymmetric() override { return false; } 27 bool FiltersIP() override { return false; } 28 bool FiltersPort() override { return false; } 29 }; 30 31 class AddressRestrictedNAT : public NAT { 32 public: 33 bool IsSymmetric() override { return false; } 34 bool FiltersIP() override { return true; } 35 bool FiltersPort() override { return false; } 36 }; 37 38 class PortRestrictedNAT : public NAT { 39 public: 40 bool IsSymmetric() override { return false; } 41 bool FiltersIP() override { return true; } 42 bool FiltersPort() override { return true; } 43 }; 44 45 NAT* NAT::Create(NATType type) { 46 switch (type) { 47 case NAT_OPEN_CONE: return new OpenConeNAT(); 48 case NAT_ADDR_RESTRICTED: return new AddressRestrictedNAT(); 49 case NAT_PORT_RESTRICTED: return new PortRestrictedNAT(); 50 case NAT_SYMMETRIC: return new SymmetricNAT(); 51 default: assert(0); return 0; 52 } 53 } 54 55 } // namespace rtc 56
