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28 #ifndef TALK_BASE_NATSERVER_H_
29 #define TALK_BASE_NATSERVER_H_
34 #include "talk/base/asyncudpsocket.h"
35 #include "talk/base/socketaddresspair.h"
36 #include "talk/base/thread.h"
37 #include "talk/base/socketfactory.h"
38 #include "talk/base/nattypes.h"
42 // Change how routes (socketaddress pairs) are compared based on the type of
43 // NAT. The NAT server maintains a hashtable of the routes that it knows
44 // about. So these affect which routes are treated the same.
46 explicit RouteCmp(NAT* nat);
47 size_t operator()(const SocketAddressPair& r) const;
49 const SocketAddressPair& r1, const SocketAddressPair& r2) const;
54 // Changes how addresses are compared based on the filtering rules of the NAT.
56 explicit AddrCmp(NAT* nat);
57 size_t operator()(const SocketAddress& r) const;
58 bool operator()(const SocketAddress& r1, const SocketAddress& r2) const;
64 // Implements the NAT device. It listens for packets on the internal network,
65 // translates them, and sends them out over the external network.
67 const int NAT_SERVER_PORT = 4237;
69 class NATServer : public sigslot::has_slots<> {
72 NATType type, SocketFactory* internal, const SocketAddress& internal_addr,
73 SocketFactory* external, const SocketAddress& external_ip);
76 SocketAddress internal_address() const {
77 return server_socket_->GetLocalAddress();
80 // Packets received on one of the networks.
81 void OnInternalPacket(AsyncPacketSocket* socket, const char* buf,
82 size_t size, const SocketAddress& addr,
83 const PacketTime& packet_time);
84 void OnExternalPacket(AsyncPacketSocket* socket, const char* buf,
85 size_t size, const SocketAddress& remote_addr,
86 const PacketTime& packet_time);
89 typedef std::set<SocketAddress, AddrCmp> AddressSet;
91 /* Records a translation and the associated external socket. */
93 TransEntry(const SocketAddressPair& r, AsyncUDPSocket* s, NAT* nat);
96 void WhitelistInsert(const SocketAddress& addr);
97 bool WhitelistContains(const SocketAddress& ext_addr);
99 SocketAddressPair route;
100 AsyncUDPSocket* socket;
101 AddressSet* whitelist;
102 CriticalSection crit_;
105 typedef std::map<SocketAddressPair, TransEntry*, RouteCmp> InternalMap;
106 typedef std::map<SocketAddress, TransEntry*> ExternalMap;
108 /* Creates a new entry that translates the given route. */
109 void Translate(const SocketAddressPair& route);
111 /* Determines whether the NAT would filter out a packet from this address. */
112 bool ShouldFilterOut(TransEntry* entry, const SocketAddress& ext_addr);
115 SocketFactory* internal_;
116 SocketFactory* external_;
117 SocketAddress external_ip_;
118 AsyncUDPSocket* server_socket_;
119 AsyncSocket* tcp_server_socket_;
120 InternalMap* int_map_;
121 ExternalMap* ext_map_;
122 DISALLOW_EVIL_CONSTRUCTORS(NATServer);
125 } // namespace talk_base
127 #endif // TALK_BASE_NATSERVER_H_