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| 1 /* | 1 /* |
| 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 | 10 |
| 11 #ifndef WEBRTC_BASE_NATSERVER_H_ | 11 #ifndef WEBRTC_BASE_NATSERVER_H_ |
| 12 #define WEBRTC_BASE_NATSERVER_H_ | 12 #define WEBRTC_BASE_NATSERVER_H_ |
| 13 | 13 |
| 14 #include <map> | |
| 15 #include <set> | |
| 16 | 14 |
| 17 #include "webrtc/base/asyncudpsocket.h" | 15 // This header is deprecated and is just left here temporarily during |
| 18 #include "webrtc/base/constructormagic.h" | 16 // refactoring. See https://bugs.webrtc.org/7634 for more details. |
| 19 #include "webrtc/base/socketaddresspair.h" | 17 #include "webrtc/rtc_base/natserver.h" |
| 20 #include "webrtc/base/thread.h" | |
| 21 #include "webrtc/base/socketfactory.h" | |
| 22 #include "webrtc/base/nattypes.h" | |
| 23 #include "webrtc/base/proxyserver.h" | |
| 24 | |
| 25 namespace rtc { | |
| 26 | |
| 27 // Change how routes (socketaddress pairs) are compared based on the type of | |
| 28 // NAT. The NAT server maintains a hashtable of the routes that it knows | |
| 29 // about. So these affect which routes are treated the same. | |
| 30 struct RouteCmp { | |
| 31 explicit RouteCmp(NAT* nat); | |
| 32 size_t operator()(const SocketAddressPair& r) const; | |
| 33 bool operator()( | |
| 34 const SocketAddressPair& r1, const SocketAddressPair& r2) const; | |
| 35 | |
| 36 bool symmetric; | |
| 37 }; | |
| 38 | |
| 39 // Changes how addresses are compared based on the filtering rules of the NAT. | |
| 40 struct AddrCmp { | |
| 41 explicit AddrCmp(NAT* nat); | |
| 42 size_t operator()(const SocketAddress& r) const; | |
| 43 bool operator()(const SocketAddress& r1, const SocketAddress& r2) const; | |
| 44 | |
| 45 bool use_ip; | |
| 46 bool use_port; | |
| 47 }; | |
| 48 | |
| 49 // Implements the NAT device. It listens for packets on the internal network, | |
| 50 // translates them, and sends them out over the external network. | |
| 51 // | |
| 52 // TCP connections initiated from the internal side of the NAT server are | |
| 53 // also supported, by making a connection to the NAT server's TCP address and | |
| 54 // then sending the remote address in quasi-STUN format. The connection status | |
| 55 // will be indicated back to the client as a 1 byte status code, where '0' | |
| 56 // indicates success. | |
| 57 | |
| 58 const int NAT_SERVER_UDP_PORT = 4237; | |
| 59 const int NAT_SERVER_TCP_PORT = 4238; | |
| 60 | |
| 61 class NATServer : public sigslot::has_slots<> { | |
| 62 public: | |
| 63 NATServer( | |
| 64 NATType type, SocketFactory* internal, | |
| 65 const SocketAddress& internal_udp_addr, | |
| 66 const SocketAddress& internal_tcp_addr, | |
| 67 SocketFactory* external, const SocketAddress& external_ip); | |
| 68 ~NATServer() override; | |
| 69 | |
| 70 SocketAddress internal_udp_address() const { | |
| 71 return udp_server_socket_->GetLocalAddress(); | |
| 72 } | |
| 73 | |
| 74 SocketAddress internal_tcp_address() const { | |
| 75 return tcp_proxy_server_->GetServerAddress(); | |
| 76 } | |
| 77 | |
| 78 // Packets received on one of the networks. | |
| 79 void OnInternalUDPPacket(AsyncPacketSocket* socket, const char* buf, | |
| 80 size_t size, const SocketAddress& addr, | |
| 81 const PacketTime& packet_time); | |
| 82 void OnExternalUDPPacket(AsyncPacketSocket* socket, const char* buf, | |
| 83 size_t size, const SocketAddress& remote_addr, | |
| 84 const PacketTime& packet_time); | |
| 85 | |
| 86 private: | |
| 87 typedef std::set<SocketAddress, AddrCmp> AddressSet; | |
| 88 | |
| 89 /* Records a translation and the associated external socket. */ | |
| 90 struct TransEntry { | |
| 91 TransEntry(const SocketAddressPair& r, AsyncUDPSocket* s, NAT* nat); | |
| 92 ~TransEntry(); | |
| 93 | |
| 94 void WhitelistInsert(const SocketAddress& addr); | |
| 95 bool WhitelistContains(const SocketAddress& ext_addr); | |
| 96 | |
| 97 SocketAddressPair route; | |
| 98 AsyncUDPSocket* socket; | |
| 99 AddressSet* whitelist; | |
| 100 CriticalSection crit_; | |
| 101 }; | |
| 102 | |
| 103 typedef std::map<SocketAddressPair, TransEntry*, RouteCmp> InternalMap; | |
| 104 typedef std::map<SocketAddress, TransEntry*> ExternalMap; | |
| 105 | |
| 106 /* Creates a new entry that translates the given route. */ | |
| 107 void Translate(const SocketAddressPair& route); | |
| 108 | |
| 109 /* Determines whether the NAT would filter out a packet from this address. */ | |
| 110 bool ShouldFilterOut(TransEntry* entry, const SocketAddress& ext_addr); | |
| 111 | |
| 112 NAT* nat_; | |
| 113 SocketFactory* external_; | |
| 114 SocketAddress external_ip_; | |
| 115 AsyncUDPSocket* udp_server_socket_; | |
| 116 ProxyServer* tcp_proxy_server_; | |
| 117 InternalMap* int_map_; | |
| 118 ExternalMap* ext_map_; | |
| 119 RTC_DISALLOW_COPY_AND_ASSIGN(NATServer); | |
| 120 }; | |
| 121 | |
| 122 } // namespace rtc | |
| 123 | 18 |
| 124 #endif // WEBRTC_BASE_NATSERVER_H_ | 19 #endif // WEBRTC_BASE_NATSERVER_H_ |
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