henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 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 | #ifndef TALK_BASE_NATSOCKETFACTORY_H_ |
| 29 | #define TALK_BASE_NATSOCKETFACTORY_H_ |
| 30 | |
| 31 | #include <string> |
| 32 | #include <map> |
| 33 | #include <set> |
| 34 | |
| 35 | #include "talk/base/natserver.h" |
| 36 | #include "talk/base/socketaddress.h" |
| 37 | #include "talk/base/socketserver.h" |
| 38 | |
| 39 | namespace talk_base { |
| 40 | |
| 41 | const size_t kNATEncodedIPv4AddressSize = 8U; |
| 42 | const size_t kNATEncodedIPv6AddressSize = 20U; |
| 43 | |
| 44 | // Used by the NAT socket implementation. |
| 45 | class NATInternalSocketFactory { |
| 46 | public: |
| 47 | virtual ~NATInternalSocketFactory() {} |
| 48 | virtual AsyncSocket* CreateInternalSocket(int family, int type, |
| 49 | const SocketAddress& local_addr, SocketAddress* nat_addr) = 0; |
| 50 | }; |
| 51 | |
| 52 | // Creates sockets that will send all traffic through a NAT, using an existing |
| 53 | // NATServer instance running at nat_addr. The actual data is sent using sockets |
| 54 | // from a socket factory, given to the constructor. |
| 55 | class NATSocketFactory : public SocketFactory, public NATInternalSocketFactory { |
| 56 | public: |
| 57 | NATSocketFactory(SocketFactory* factory, const SocketAddress& nat_addr); |
| 58 | |
| 59 | // SocketFactory implementation |
| 60 | virtual Socket* CreateSocket(int type); |
| 61 | virtual Socket* CreateSocket(int family, int type); |
| 62 | virtual AsyncSocket* CreateAsyncSocket(int type); |
| 63 | virtual AsyncSocket* CreateAsyncSocket(int family, int type); |
| 64 | |
| 65 | // NATInternalSocketFactory implementation |
| 66 | virtual AsyncSocket* CreateInternalSocket(int family, int type, |
| 67 | const SocketAddress& local_addr, SocketAddress* nat_addr); |
| 68 | |
| 69 | private: |
| 70 | SocketFactory* factory_; |
| 71 | SocketAddress nat_addr_; |
| 72 | DISALLOW_EVIL_CONSTRUCTORS(NATSocketFactory); |
| 73 | }; |
| 74 | |
| 75 | // Creates sockets that will send traffic through a NAT depending on what |
| 76 | // address they bind to. This can be used to simulate a client on a NAT sending |
| 77 | // to a client that is not behind a NAT. |
| 78 | // Note that the internal addresses of clients must be unique. This is because |
| 79 | // there is only one socketserver per thread, and the Bind() address is used to |
| 80 | // figure out which NAT (if any) the socket should talk to. |
| 81 | // |
| 82 | // Example with 3 NATs (2 cascaded), and 3 clients. |
| 83 | // ss->AddTranslator("1.2.3.4", "192.168.0.1", NAT_ADDR_RESTRICTED); |
| 84 | // ss->AddTranslator("99.99.99.99", "10.0.0.1", NAT_SYMMETRIC)-> |
| 85 | // AddTranslator("10.0.0.2", "192.168.1.1", NAT_OPEN_CONE); |
| 86 | // ss->GetTranslator("1.2.3.4")->AddClient("1.2.3.4", "192.168.0.2"); |
| 87 | // ss->GetTranslator("99.99.99.99")->AddClient("10.0.0.3"); |
| 88 | // ss->GetTranslator("99.99.99.99")->GetTranslator("10.0.0.2")-> |
| 89 | // AddClient("192.168.1.2"); |
| 90 | class NATSocketServer : public SocketServer, public NATInternalSocketFactory { |
| 91 | public: |
| 92 | class Translator; |
| 93 | // holds a list of NATs |
| 94 | class TranslatorMap : private std::map<SocketAddress, Translator*> { |
| 95 | public: |
| 96 | ~TranslatorMap(); |
| 97 | Translator* Get(const SocketAddress& ext_ip); |
| 98 | Translator* Add(const SocketAddress& ext_ip, Translator*); |
| 99 | void Remove(const SocketAddress& ext_ip); |
| 100 | Translator* FindClient(const SocketAddress& int_ip); |
| 101 | }; |
| 102 | |
| 103 | // a specific NAT |
| 104 | class Translator { |
| 105 | public: |
| 106 | Translator(NATSocketServer* server, NATType type, |
| 107 | const SocketAddress& int_addr, SocketFactory* ext_factory, |
| 108 | const SocketAddress& ext_addr); |
| 109 | |
| 110 | SocketFactory* internal_factory() { return internal_factory_.get(); } |
| 111 | SocketAddress internal_address() const { |
| 112 | return nat_server_->internal_address(); |
| 113 | } |
| 114 | SocketAddress internal_tcp_address() const { |
| 115 | return SocketAddress(); // nat_server_->internal_tcp_address(); |
| 116 | } |
| 117 | |
| 118 | Translator* GetTranslator(const SocketAddress& ext_ip); |
| 119 | Translator* AddTranslator(const SocketAddress& ext_ip, |
| 120 | const SocketAddress& int_ip, NATType type); |
| 121 | void RemoveTranslator(const SocketAddress& ext_ip); |
| 122 | |
| 123 | bool AddClient(const SocketAddress& int_ip); |
| 124 | void RemoveClient(const SocketAddress& int_ip); |
| 125 | |
| 126 | // Looks for the specified client in this or a child NAT. |
| 127 | Translator* FindClient(const SocketAddress& int_ip); |
| 128 | |
| 129 | private: |
| 130 | NATSocketServer* server_; |
| 131 | scoped_ptr<SocketFactory> internal_factory_; |
| 132 | scoped_ptr<NATServer> nat_server_; |
| 133 | TranslatorMap nats_; |
| 134 | std::set<SocketAddress> clients_; |
| 135 | }; |
| 136 | |
| 137 | explicit NATSocketServer(SocketServer* ss); |
| 138 | |
| 139 | SocketServer* socketserver() { return server_; } |
| 140 | MessageQueue* queue() { return msg_queue_; } |
| 141 | |
| 142 | Translator* GetTranslator(const SocketAddress& ext_ip); |
| 143 | Translator* AddTranslator(const SocketAddress& ext_ip, |
| 144 | const SocketAddress& int_ip, NATType type); |
| 145 | void RemoveTranslator(const SocketAddress& ext_ip); |
| 146 | |
| 147 | // SocketServer implementation |
| 148 | virtual Socket* CreateSocket(int type); |
| 149 | virtual Socket* CreateSocket(int family, int type); |
| 150 | |
| 151 | virtual AsyncSocket* CreateAsyncSocket(int type); |
| 152 | virtual AsyncSocket* CreateAsyncSocket(int family, int type); |
| 153 | |
| 154 | virtual void SetMessageQueue(MessageQueue* queue) { |
| 155 | msg_queue_ = queue; |
| 156 | server_->SetMessageQueue(queue); |
| 157 | } |
| 158 | virtual bool Wait(int cms, bool process_io) { |
| 159 | return server_->Wait(cms, process_io); |
| 160 | } |
| 161 | virtual void WakeUp() { |
| 162 | server_->WakeUp(); |
| 163 | } |
| 164 | |
| 165 | // NATInternalSocketFactory implementation |
| 166 | virtual AsyncSocket* CreateInternalSocket(int family, int type, |
| 167 | const SocketAddress& local_addr, SocketAddress* nat_addr); |
| 168 | |
| 169 | private: |
| 170 | SocketServer* server_; |
| 171 | MessageQueue* msg_queue_; |
| 172 | TranslatorMap nats_; |
| 173 | DISALLOW_EVIL_CONSTRUCTORS(NATSocketServer); |
| 174 | }; |
| 175 | |
| 176 | // Free-standing NAT helper functions. |
| 177 | size_t PackAddressForNAT(char* buf, size_t buf_size, |
| 178 | const SocketAddress& remote_addr); |
| 179 | size_t UnpackAddressFromNAT(const char* buf, size_t buf_size, |
| 180 | SocketAddress* remote_addr); |
| 181 | } // namespace talk_base |
| 182 | |
| 183 | #endif // TALK_BASE_NATSOCKETFACTORY_H_ |