c5d0d95fd8
This was already working in most cases, but not for some corner cases: * If the PORTALLOCATOR_ENABLE_SHARED_SOCKET flag is not set * If both a STUN server and TURN server are configured I added unit tests for these cases, and centralized the code that gets STUN server addresses in order to fix these and any related issues. BUG=webrtc:4215 Review URL: https://codereview.webrtc.org/1215713003 Cr-Commit-Position: refs/heads/master@{#9596}
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_NATSERVER_H_
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#define WEBRTC_BASE_NATSERVER_H_
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#include <map>
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#include <set>
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#include "webrtc/base/asyncudpsocket.h"
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#include "webrtc/base/socketaddresspair.h"
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#include "webrtc/base/thread.h"
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#include "webrtc/base/socketfactory.h"
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#include "webrtc/base/nattypes.h"
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#include "webrtc/base/proxyserver.h"
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namespace rtc {
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// Change how routes (socketaddress pairs) are compared based on the type of
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// NAT. The NAT server maintains a hashtable of the routes that it knows
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// about. So these affect which routes are treated the same.
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struct RouteCmp {
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explicit RouteCmp(NAT* nat);
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size_t operator()(const SocketAddressPair& r) const;
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bool operator()(
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const SocketAddressPair& r1, const SocketAddressPair& r2) const;
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bool symmetric;
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};
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// Changes how addresses are compared based on the filtering rules of the NAT.
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struct AddrCmp {
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explicit AddrCmp(NAT* nat);
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size_t operator()(const SocketAddress& r) const;
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bool operator()(const SocketAddress& r1, const SocketAddress& r2) const;
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bool use_ip;
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bool use_port;
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};
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// Implements the NAT device. It listens for packets on the internal network,
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// translates them, and sends them out over the external network.
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//
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// TCP connections initiated from the internal side of the NAT server are
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// also supported, by making a connection to the NAT server's TCP address and
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// then sending the remote address in quasi-STUN format. The connection status
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// will be indicated back to the client as a 1 byte status code, where '0'
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// indicates success.
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const int NAT_SERVER_UDP_PORT = 4237;
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const int NAT_SERVER_TCP_PORT = 4238;
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class NATServer : public sigslot::has_slots<> {
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public:
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NATServer(
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NATType type, SocketFactory* internal,
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const SocketAddress& internal_udp_addr,
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const SocketAddress& internal_tcp_addr,
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SocketFactory* external, const SocketAddress& external_ip);
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~NATServer() override;
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SocketAddress internal_udp_address() const {
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return udp_server_socket_->GetLocalAddress();
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}
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SocketAddress internal_tcp_address() const {
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return tcp_proxy_server_->GetServerAddress();
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}
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// Packets received on one of the networks.
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void OnInternalUDPPacket(AsyncPacketSocket* socket, const char* buf,
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size_t size, const SocketAddress& addr,
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const PacketTime& packet_time);
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void OnExternalUDPPacket(AsyncPacketSocket* socket, const char* buf,
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size_t size, const SocketAddress& remote_addr,
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const PacketTime& packet_time);
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private:
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typedef std::set<SocketAddress, AddrCmp> AddressSet;
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/* Records a translation and the associated external socket. */
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struct TransEntry {
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TransEntry(const SocketAddressPair& r, AsyncUDPSocket* s, NAT* nat);
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~TransEntry();
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void WhitelistInsert(const SocketAddress& addr);
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bool WhitelistContains(const SocketAddress& ext_addr);
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SocketAddressPair route;
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AsyncUDPSocket* socket;
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AddressSet* whitelist;
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CriticalSection crit_;
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};
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typedef std::map<SocketAddressPair, TransEntry*, RouteCmp> InternalMap;
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typedef std::map<SocketAddress, TransEntry*> ExternalMap;
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/* Creates a new entry that translates the given route. */
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void Translate(const SocketAddressPair& route);
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/* Determines whether the NAT would filter out a packet from this address. */
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bool ShouldFilterOut(TransEntry* entry, const SocketAddress& ext_addr);
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NAT* nat_;
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SocketFactory* internal_;
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SocketFactory* external_;
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SocketAddress external_ip_;
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AsyncUDPSocket* udp_server_socket_;
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ProxyServer* tcp_proxy_server_;
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InternalMap* int_map_;
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ExternalMap* ext_map_;
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DISALLOW_COPY_AND_ASSIGN(NATServer);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_NATSERVER_H_
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