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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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