1 /* 2 * libjingle 3 * Copyright 2004--2005, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <cassert> 29 30 #include "talk/base/nattypes.h" 31 32 namespace talk_base { 33 34 class SymmetricNAT : public NAT { 35 public: 36 bool IsSymmetric() { return true; } 37 bool FiltersIP() { return true; } 38 bool FiltersPort() { return true; } 39 }; 40 41 class OpenConeNAT : public NAT { 42 public: 43 bool IsSymmetric() { return false; } 44 bool FiltersIP() { return false; } 45 bool FiltersPort() { return false; } 46 }; 47 48 class AddressRestrictedNAT : public NAT { 49 public: 50 bool IsSymmetric() { return false; } 51 bool FiltersIP() { return true; } 52 bool FiltersPort() { return false; } 53 }; 54 55 class PortRestrictedNAT : public NAT { 56 public: 57 bool IsSymmetric() { return false; } 58 bool FiltersIP() { return true; } 59 bool FiltersPort() { return true; } 60 }; 61 62 NAT* NAT::Create(NATType type) { 63 switch (type) { 64 case NAT_OPEN_CONE: return new OpenConeNAT(); 65 case NAT_ADDR_RESTRICTED: return new AddressRestrictedNAT(); 66 case NAT_PORT_RESTRICTED: return new PortRestrictedNAT(); 67 case NAT_SYMMETRIC: return new SymmetricNAT(); 68 default: assert(0); return 0; 69 } 70 } 71 72 } // namespace talk_base 73
