rtc_base/nat_unittest.cc - src.git - Git at Google

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include <string.h>
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>

 #include "absl/memory/memory.h"
 #include "rtc_base/asyncpacketsocket.h"
 #include "rtc_base/asyncsocket.h"
 #include "rtc_base/asynctcpsocket.h"
 #include "rtc_base/asyncudpsocket.h"
 #include "rtc_base/gunit.h"
 #include "rtc_base/ipaddress.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/natserver.h"
 #include "rtc_base/natsocketfactory.h"
 #include "rtc_base/nattypes.h"
 #include "rtc_base/nethelpers.h"
 #include "rtc_base/network.h"
 #include "rtc_base/physicalsocketserver.h"
 #include "rtc_base/socketaddress.h"
 #include "rtc_base/socketfactory.h"
 #include "rtc_base/socketserver.h"
 #include "rtc_base/testclient.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"
 #include "rtc_base/virtualsocketserver.h"
 #include "test/gtest.h"

 using namespace rtc;

 bool CheckReceive(TestClient* client,
                   bool should_receive,
                   const char* buf,
                   size_t size) {
   return (should_receive) ? client->CheckNextPacket(buf, size, 0)
                           : client->CheckNoPacket();
 }

 TestClient* CreateTestClient(SocketFactory* factory,
                              const SocketAddress& local_addr) {
   return new TestClient(
       absl::WrapUnique(AsyncUDPSocket::Create(factory, local_addr)));
 }

 TestClient* CreateTCPTestClient(AsyncSocket* socket) {
   return new TestClient(absl::make_unique<AsyncTCPSocket>(socket, false));
 }

 // Tests that when sending from internal_addr to external_addrs through the
 // NAT type specified by nat_type, all external addrs receive the sent packet
 // and, if exp_same is true, all use the same mapped-address on the NAT.
 void TestSend(SocketServer* internal,
               const SocketAddress& internal_addr,
               SocketServer* external,
               const SocketAddress external_addrs[4],
               NATType nat_type,
               bool exp_same) {
   Thread th_int(internal);
   Thread th_ext(external);

   SocketAddress server_addr = internal_addr;
   server_addr.SetPort(0);  // Auto-select a port
   NATServer* nat = new NATServer(nat_type, internal, server_addr, server_addr,
                                  external, external_addrs[0]);
   NATSocketFactory* natsf = new NATSocketFactory(
       internal, nat->internal_udp_address(), nat->internal_tcp_address());

   TestClient* in = CreateTestClient(natsf, internal_addr);
   TestClient* out[4];
   for (int i = 0; i < 4; i++)
     out[i] = CreateTestClient(external, external_addrs[i]);

   th_int.Start();
   th_ext.Start();

   const char* buf = "filter_test";
   size_t len = strlen(buf);

   in->SendTo(buf, len, out[0]->address());
   SocketAddress trans_addr;
   EXPECT_TRUE(out[0]->CheckNextPacket(buf, len, &trans_addr));

   for (int i = 1; i < 4; i++) {
     in->SendTo(buf, len, out[i]->address());
     SocketAddress trans_addr2;
     EXPECT_TRUE(out[i]->CheckNextPacket(buf, len, &trans_addr2));
     bool are_same = (trans_addr == trans_addr2);
     ASSERT_EQ(are_same, exp_same) << "same translated address";
     ASSERT_NE(AF_UNSPEC, trans_addr.family());
     ASSERT_NE(AF_UNSPEC, trans_addr2.family());
   }

   th_int.Stop();
   th_ext.Stop();

   delete nat;
   delete natsf;
   delete in;
   for (int i = 0; i < 4; i++)
     delete out[i];
 }

 // Tests that when sending from external_addrs to internal_addr, the packet
 // is delivered according to the specified filter_ip and filter_port rules.
 void TestRecv(SocketServer* internal,
               const SocketAddress& internal_addr,
               SocketServer* external,
               const SocketAddress external_addrs[4],
               NATType nat_type,
               bool filter_ip,
               bool filter_port) {
   Thread th_int(internal);
   Thread th_ext(external);

   SocketAddress server_addr = internal_addr;
   server_addr.SetPort(0);  // Auto-select a port
   NATServer* nat = new NATServer(nat_type, internal, server_addr, server_addr,
                                  external, external_addrs[0]);
   NATSocketFactory* natsf = new NATSocketFactory(
       internal, nat->internal_udp_address(), nat->internal_tcp_address());

   TestClient* in = CreateTestClient(natsf, internal_addr);
   TestClient* out[4];
   for (int i = 0; i < 4; i++)
     out[i] = CreateTestClient(external, external_addrs[i]);

   th_int.Start();
   th_ext.Start();

   const char* buf = "filter_test";
   size_t len = strlen(buf);

   in->SendTo(buf, len, out[0]->address());
   SocketAddress trans_addr;
   EXPECT_TRUE(out[0]->CheckNextPacket(buf, len, &trans_addr));

   out[1]->SendTo(buf, len, trans_addr);
   EXPECT_TRUE(CheckReceive(in, !filter_ip, buf, len));

   out[2]->SendTo(buf, len, trans_addr);
   EXPECT_TRUE(CheckReceive(in, !filter_port, buf, len));

   out[3]->SendTo(buf, len, trans_addr);
   EXPECT_TRUE(CheckReceive(in, !filter_ip && !filter_port, buf, len));

   th_int.Stop();
   th_ext.Stop();

   delete nat;
   delete natsf;
   delete in;
   for (int i = 0; i < 4; i++)
     delete out[i];
 }

 // Tests that NATServer allocates bindings properly.
 void TestBindings(SocketServer* internal,
                   const SocketAddress& internal_addr,
                   SocketServer* external,
                   const SocketAddress external_addrs[4]) {
   TestSend(internal, internal_addr, external, external_addrs, NAT_OPEN_CONE,
            true);
   TestSend(internal, internal_addr, external, external_addrs,
            NAT_ADDR_RESTRICTED, true);
   TestSend(internal, internal_addr, external, external_addrs,
            NAT_PORT_RESTRICTED, true);
   TestSend(internal, internal_addr, external, external_addrs, NAT_SYMMETRIC,
            false);
 }

 // Tests that NATServer filters packets properly.
 void TestFilters(SocketServer* internal,
                  const SocketAddress& internal_addr,
                  SocketServer* external,
                  const SocketAddress external_addrs[4]) {
   TestRecv(internal, internal_addr, external, external_addrs, NAT_OPEN_CONE,
            false, false);
   TestRecv(internal, internal_addr, external, external_addrs,
            NAT_ADDR_RESTRICTED, true, false);
   TestRecv(internal, internal_addr, external, external_addrs,
            NAT_PORT_RESTRICTED, true, true);
   TestRecv(internal, internal_addr, external, external_addrs, NAT_SYMMETRIC,
            true, true);
 }

 bool TestConnectivity(const SocketAddress& src, const IPAddress& dst) {
   // The physical NAT tests require connectivity to the selected ip from the
   // internal address used for the NAT. Things like firewalls can break that, so
   // check to see if it's worth even trying with this ip.
   std::unique_ptr<PhysicalSocketServer> pss(new PhysicalSocketServer());
   std::unique_ptr<AsyncSocket> client(
       pss->CreateAsyncSocket(src.family(), SOCK_DGRAM));
   std::unique_ptr<AsyncSocket> server(
       pss->CreateAsyncSocket(src.family(), SOCK_DGRAM));
   if (client->Bind(SocketAddress(src.ipaddr(), 0)) != 0 ||
       server->Bind(SocketAddress(dst, 0)) != 0) {
     return false;
   }
   const char* buf = "hello other socket";
   size_t len = strlen(buf);
   int sent = client->SendTo(buf, len, server->GetLocalAddress());
   SocketAddress addr;
   const size_t kRecvBufSize = 64;
   char recvbuf[kRecvBufSize];
   Thread::Current()->SleepMs(100);
   int received = server->RecvFrom(recvbuf, kRecvBufSize, &addr, nullptr);
   return received == sent && ::memcmp(buf, recvbuf, len) == 0;
 }

 void TestPhysicalInternal(const SocketAddress& int_addr) {
   BasicNetworkManager network_manager;
   network_manager.set_ipv6_enabled(true);
   network_manager.StartUpdating();
   // Process pending messages so the network list is updated.
   Thread::Current()->ProcessMessages(0);

   std::vector<Network*> networks;
   network_manager.GetNetworks(&networks);
   networks.erase(std::remove_if(networks.begin(), networks.end(),
                                 [](rtc::Network* network) {
                                   return rtc::kDefaultNetworkIgnoreMask &
                                          network->type();
                                 }),
                  networks.end());
   if (networks.empty()) {
     RTC_LOG(LS_WARNING) << "Not enough network adapters for test.";
     return;
   }

   SocketAddress ext_addr1(int_addr);
   SocketAddress ext_addr2;
   // Find an available IP with matching family. The test breaks if int_addr
   // can't talk to ip, so check for connectivity as well.
   for (std::vector<Network*>::iterator it = networks.begin();
        it != networks.end(); ++it) {
     const IPAddress& ip = (*it)->GetBestIP();
     if (ip.family() == int_addr.family() && TestConnectivity(int_addr, ip)) {
       ext_addr2.SetIP(ip);
       break;
     }
   }
   if (ext_addr2.IsNil()) {
     RTC_LOG(LS_WARNING) << "No available IP of same family as "
                         << int_addr.ToString();
     return;
   }

   RTC_LOG(LS_INFO) << "selected ip " << ext_addr2.ipaddr().ToString();

   SocketAddress ext_addrs[4] = {
       SocketAddress(ext_addr1), SocketAddress(ext_addr2),
       SocketAddress(ext_addr1), SocketAddress(ext_addr2)};

   std::unique_ptr<PhysicalSocketServer> int_pss(new PhysicalSocketServer());
   std::unique_ptr<PhysicalSocketServer> ext_pss(new PhysicalSocketServer());

   TestBindings(int_pss.get(), int_addr, ext_pss.get(), ext_addrs);
   TestFilters(int_pss.get(), int_addr, ext_pss.get(), ext_addrs);
 }

 TEST(NatTest, TestPhysicalIPv4) {
   TestPhysicalInternal(SocketAddress("127.0.0.1", 0));
 }

 TEST(NatTest, TestPhysicalIPv6) {
   if (HasIPv6Enabled()) {
     TestPhysicalInternal(SocketAddress("::1", 0));
   } else {
     RTC_LOG(LS_WARNING) << "No IPv6, skipping";
   }
 }

 namespace {

 class TestVirtualSocketServer : public VirtualSocketServer {
  public:
   // Expose this publicly
   IPAddress GetNextIP(int af) { return VirtualSocketServer::GetNextIP(af); }
 };

 }  // namespace

 void TestVirtualInternal(int family) {
   std::unique_ptr<TestVirtualSocketServer> int_vss(
       new TestVirtualSocketServer());
   std::unique_ptr<TestVirtualSocketServer> ext_vss(
       new TestVirtualSocketServer());

   SocketAddress int_addr;
   SocketAddress ext_addrs[4];
   int_addr.SetIP(int_vss->GetNextIP(family));
   ext_addrs[0].SetIP(ext_vss->GetNextIP(int_addr.family()));
   ext_addrs[1].SetIP(ext_vss->GetNextIP(int_addr.family()));
   ext_addrs[2].SetIP(ext_addrs[0].ipaddr());
   ext_addrs[3].SetIP(ext_addrs[1].ipaddr());

   TestBindings(int_vss.get(), int_addr, ext_vss.get(), ext_addrs);
   TestFilters(int_vss.get(), int_addr, ext_vss.get(), ext_addrs);
 }

 TEST(NatTest, TestVirtualIPv4) {
   TestVirtualInternal(AF_INET);
 }

 TEST(NatTest, TestVirtualIPv6) {
   if (HasIPv6Enabled()) {
     TestVirtualInternal(AF_INET6);
   } else {
     RTC_LOG(LS_WARNING) << "No IPv6, skipping";
   }
 }

 class NatTcpTest : public testing::Test, public sigslot::has_slots<> {
  public:
   NatTcpTest()
       : int_addr_("192.168.0.1", 0),
         ext_addr_("10.0.0.1", 0),
         connected_(false),
         int_vss_(new TestVirtualSocketServer()),
         ext_vss_(new TestVirtualSocketServer()),
         int_thread_(new Thread(int_vss_.get())),
         ext_thread_(new Thread(ext_vss_.get())),
         nat_(new NATServer(NAT_OPEN_CONE,
                            int_vss_.get(),
                            int_addr_,
                            int_addr_,
                            ext_vss_.get(),
                            ext_addr_)),
         natsf_(new NATSocketFactory(int_vss_.get(),
                                     nat_->internal_udp_address(),
                                     nat_->internal_tcp_address())) {
     int_thread_->Start();
     ext_thread_->Start();
   }

   void OnConnectEvent(AsyncSocket* socket) { connected_ = true; }

   void OnAcceptEvent(AsyncSocket* socket) {
     accepted_.reset(server_->Accept(nullptr));
   }

   void OnCloseEvent(AsyncSocket* socket, int error) {}

   void ConnectEvents() {
     server_->SignalReadEvent.connect(this, &NatTcpTest::OnAcceptEvent);
     client_->SignalConnectEvent.connect(this, &NatTcpTest::OnConnectEvent);
   }

   SocketAddress int_addr_;
   SocketAddress ext_addr_;
   bool connected_;
   std::unique_ptr<TestVirtualSocketServer> int_vss_;
   std::unique_ptr<TestVirtualSocketServer> ext_vss_;
   std::unique_ptr<Thread> int_thread_;
   std::unique_ptr<Thread> ext_thread_;
   std::unique_ptr<NATServer> nat_;
   std::unique_ptr<NATSocketFactory> natsf_;
   std::unique_ptr<AsyncSocket> client_;
   std::unique_ptr<AsyncSocket> server_;
   std::unique_ptr<AsyncSocket> accepted_;
 };

 TEST_F(NatTcpTest, DISABLED_TestConnectOut) {
   server_.reset(ext_vss_->CreateAsyncSocket(AF_INET, SOCK_STREAM));
   server_->Bind(ext_addr_);
   server_->Listen(5);

   client_.reset(natsf_->CreateAsyncSocket(AF_INET, SOCK_STREAM));
   EXPECT_GE(0, client_->Bind(int_addr_));
   EXPECT_GE(0, client_->Connect(server_->GetLocalAddress()));

   ConnectEvents();

   EXPECT_TRUE_WAIT(connected_, 1000);
   EXPECT_EQ(client_->GetRemoteAddress(), server_->GetLocalAddress());
   EXPECT_EQ(accepted_->GetRemoteAddress().ipaddr(), ext_addr_.ipaddr());

   std::unique_ptr<rtc::TestClient> in(CreateTCPTestClient(client_.release()));
   std::unique_ptr<rtc::TestClient> out(
       CreateTCPTestClient(accepted_.release()));

   const char* buf = "test_packet";
   size_t len = strlen(buf);

   in->Send(buf, len);
   SocketAddress trans_addr;
   EXPECT_TRUE(out->CheckNextPacket(buf, len, &trans_addr));

   out->Send(buf, len);
   EXPECT_TRUE(in->CheckNextPacket(buf, len, &trans_addr));
 }
 // #endif
	/*
	* Copyright 2004 The WebRTC Project Authors. All rights reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include <string.h>
	#include <algorithm>
	#include <memory>
	#include <string>
	#include <vector>

	#include "absl/memory/memory.h"
	#include "rtc_base/asyncpacketsocket.h"
	#include "rtc_base/asyncsocket.h"
	#include "rtc_base/asynctcpsocket.h"
	#include "rtc_base/asyncudpsocket.h"
	#include "rtc_base/gunit.h"
	#include "rtc_base/ipaddress.h"
	#include "rtc_base/logging.h"
	#include "rtc_base/natserver.h"
	#include "rtc_base/natsocketfactory.h"
	#include "rtc_base/nattypes.h"
	#include "rtc_base/nethelpers.h"
	#include "rtc_base/network.h"
	#include "rtc_base/physicalsocketserver.h"
	#include "rtc_base/socketaddress.h"
	#include "rtc_base/socketfactory.h"
	#include "rtc_base/socketserver.h"
	#include "rtc_base/testclient.h"
	#include "rtc_base/third_party/sigslot/sigslot.h"
	#include "rtc_base/thread.h"
	#include "rtc_base/virtualsocketserver.h"
	#include "test/gtest.h"

	using namespace rtc;

	bool CheckReceive(TestClient* client,
	bool should_receive,
	const char* buf,
	size_t size) {
	return (should_receive) ? client->CheckNextPacket(buf, size, 0)
	: client->CheckNoPacket();
	}

	TestClient* CreateTestClient(SocketFactory* factory,
	const SocketAddress& local_addr) {
	return new TestClient(
	absl::WrapUnique(AsyncUDPSocket::Create(factory, local_addr)));
	}

	TestClient* CreateTCPTestClient(AsyncSocket* socket) {
	return new TestClient(absl::make_unique<AsyncTCPSocket>(socket, false));
	}

	// Tests that when sending from internal_addr to external_addrs through the
	// NAT type specified by nat_type, all external addrs receive the sent packet
	// and, if exp_same is true, all use the same mapped-address on the NAT.
	void TestSend(SocketServer* internal,
	const SocketAddress& internal_addr,
	SocketServer* external,
	const SocketAddress external_addrs[4],
	NATType nat_type,
	bool exp_same) {
	Thread th_int(internal);
	Thread th_ext(external);

	SocketAddress server_addr = internal_addr;
	server_addr.SetPort(0); // Auto-select a port
	NATServer* nat = new NATServer(nat_type, internal, server_addr, server_addr,
	external, external_addrs[0]);
	NATSocketFactory* natsf = new NATSocketFactory(
	internal, nat->internal_udp_address(), nat->internal_tcp_address());

	TestClient* in = CreateTestClient(natsf, internal_addr);
	TestClient* out[4];
	for (int i = 0; i < 4; i++)
	out[i] = CreateTestClient(external, external_addrs[i]);

	th_int.Start();
	th_ext.Start();

	const char* buf = "filter_test";
	size_t len = strlen(buf);

	in->SendTo(buf, len, out[0]->address());
	SocketAddress trans_addr;
	EXPECT_TRUE(out[0]->CheckNextPacket(buf, len, &trans_addr));

	for (int i = 1; i < 4; i++) {
	in->SendTo(buf, len, out[i]->address());
	SocketAddress trans_addr2;
	EXPECT_TRUE(out[i]->CheckNextPacket(buf, len, &trans_addr2));
	bool are_same = (trans_addr == trans_addr2);
	ASSERT_EQ(are_same, exp_same) << "same translated address";
	ASSERT_NE(AF_UNSPEC, trans_addr.family());
	ASSERT_NE(AF_UNSPEC, trans_addr2.family());
	}

	th_int.Stop();
	th_ext.Stop();

	delete nat;
	delete natsf;
	delete in;
	for (int i = 0; i < 4; i++)
	delete out[i];
	}

	// Tests that when sending from external_addrs to internal_addr, the packet
	// is delivered according to the specified filter_ip and filter_port rules.
	void TestRecv(SocketServer* internal,
	const SocketAddress& internal_addr,
	SocketServer* external,
	const SocketAddress external_addrs[4],
	NATType nat_type,
	bool filter_ip,
	bool filter_port) {
	Thread th_int(internal);
	Thread th_ext(external);

	SocketAddress server_addr = internal_addr;
	server_addr.SetPort(0); // Auto-select a port
	NATServer* nat = new NATServer(nat_type, internal, server_addr, server_addr,
	external, external_addrs[0]);
	NATSocketFactory* natsf = new NATSocketFactory(
	internal, nat->internal_udp_address(), nat->internal_tcp_address());

	TestClient* in = CreateTestClient(natsf, internal_addr);
	TestClient* out[4];
	for (int i = 0; i < 4; i++)
	out[i] = CreateTestClient(external, external_addrs[i]);

	th_int.Start();
	th_ext.Start();

	const char* buf = "filter_test";
	size_t len = strlen(buf);

	in->SendTo(buf, len, out[0]->address());
	SocketAddress trans_addr;
	EXPECT_TRUE(out[0]->CheckNextPacket(buf, len, &trans_addr));

	out[1]->SendTo(buf, len, trans_addr);
	EXPECT_TRUE(CheckReceive(in, !filter_ip, buf, len));

	out[2]->SendTo(buf, len, trans_addr);
	EXPECT_TRUE(CheckReceive(in, !filter_port, buf, len));

	out[3]->SendTo(buf, len, trans_addr);
	EXPECT_TRUE(CheckReceive(in, !filter_ip && !filter_port, buf, len));

	th_int.Stop();
	th_ext.Stop();

	delete nat;
	delete natsf;
	delete in;
	for (int i = 0; i < 4; i++)
	delete out[i];
	}

	// Tests that NATServer allocates bindings properly.
	void TestBindings(SocketServer* internal,
	const SocketAddress& internal_addr,
	SocketServer* external,
	const SocketAddress external_addrs[4]) {
	TestSend(internal, internal_addr, external, external_addrs, NAT_OPEN_CONE,
	true);
	TestSend(internal, internal_addr, external, external_addrs,
	NAT_ADDR_RESTRICTED, true);
	TestSend(internal, internal_addr, external, external_addrs,
	NAT_PORT_RESTRICTED, true);
	TestSend(internal, internal_addr, external, external_addrs, NAT_SYMMETRIC,
	false);
	}

	// Tests that NATServer filters packets properly.
	void TestFilters(SocketServer* internal,
	const SocketAddress& internal_addr,
	SocketServer* external,
	const SocketAddress external_addrs[4]) {
	TestRecv(internal, internal_addr, external, external_addrs, NAT_OPEN_CONE,
	false, false);
	TestRecv(internal, internal_addr, external, external_addrs,
	NAT_ADDR_RESTRICTED, true, false);
	TestRecv(internal, internal_addr, external, external_addrs,
	NAT_PORT_RESTRICTED, true, true);
	TestRecv(internal, internal_addr, external, external_addrs, NAT_SYMMETRIC,
	true, true);
	}

	bool TestConnectivity(const SocketAddress& src, const IPAddress& dst) {
	// The physical NAT tests require connectivity to the selected ip from the
	// internal address used for the NAT. Things like firewalls can break that, so
	// check to see if it's worth even trying with this ip.
	std::unique_ptr<PhysicalSocketServer> pss(new PhysicalSocketServer());
	std::unique_ptr<AsyncSocket> client(
	pss->CreateAsyncSocket(src.family(), SOCK_DGRAM));
	std::unique_ptr<AsyncSocket> server(
	pss->CreateAsyncSocket(src.family(), SOCK_DGRAM));
	if (client->Bind(SocketAddress(src.ipaddr(), 0)) != 0 \|\|
	server->Bind(SocketAddress(dst, 0)) != 0) {
	return false;
	}
	const char* buf = "hello other socket";
	size_t len = strlen(buf);
	int sent = client->SendTo(buf, len, server->GetLocalAddress());
	SocketAddress addr;
	const size_t kRecvBufSize = 64;
	char recvbuf[kRecvBufSize];
	Thread::Current()->SleepMs(100);
	int received = server->RecvFrom(recvbuf, kRecvBufSize, &addr, nullptr);
	return received == sent && ::memcmp(buf, recvbuf, len) == 0;
	}

	void TestPhysicalInternal(const SocketAddress& int_addr) {
	BasicNetworkManager network_manager;
	network_manager.set_ipv6_enabled(true);
	network_manager.StartUpdating();
	// Process pending messages so the network list is updated.
	Thread::Current()->ProcessMessages(0);

	std::vector<Network*> networks;
	network_manager.GetNetworks(&networks);
	networks.erase(std::remove_if(networks.begin(), networks.end(),
	[](rtc::Network* network) {
	return rtc::kDefaultNetworkIgnoreMask &
	network->type();
	}),
	networks.end());
	if (networks.empty()) {
	RTC_LOG(LS_WARNING) << "Not enough network adapters for test.";
	return;
	}

	SocketAddress ext_addr1(int_addr);
	SocketAddress ext_addr2;
	// Find an available IP with matching family. The test breaks if int_addr
	// can't talk to ip, so check for connectivity as well.
	for (std::vector<Network*>::iterator it = networks.begin();
	it != networks.end(); ++it) {
	const IPAddress& ip = (*it)->GetBestIP();
	if (ip.family() == int_addr.family() && TestConnectivity(int_addr, ip)) {
	ext_addr2.SetIP(ip);
	break;
	}
	}
	if (ext_addr2.IsNil()) {
	RTC_LOG(LS_WARNING) << "No available IP of same family as "
	<< int_addr.ToString();
	return;
	}

	RTC_LOG(LS_INFO) << "selected ip " << ext_addr2.ipaddr().ToString();

	SocketAddress ext_addrs[4] = {
	SocketAddress(ext_addr1), SocketAddress(ext_addr2),
	SocketAddress(ext_addr1), SocketAddress(ext_addr2)};

	std::unique_ptr<PhysicalSocketServer> int_pss(new PhysicalSocketServer());
	std::unique_ptr<PhysicalSocketServer> ext_pss(new PhysicalSocketServer());

	TestBindings(int_pss.get(), int_addr, ext_pss.get(), ext_addrs);
	TestFilters(int_pss.get(), int_addr, ext_pss.get(), ext_addrs);
	}

	TEST(NatTest, TestPhysicalIPv4) {
	TestPhysicalInternal(SocketAddress("127.0.0.1", 0));
	}

	TEST(NatTest, TestPhysicalIPv6) {
	if (HasIPv6Enabled()) {
	TestPhysicalInternal(SocketAddress("::1", 0));
	} else {
	RTC_LOG(LS_WARNING) << "No IPv6, skipping";
	}
	}

	namespace {

	class TestVirtualSocketServer : public VirtualSocketServer {
	public:
	// Expose this publicly
	IPAddress GetNextIP(int af) { return VirtualSocketServer::GetNextIP(af); }
	};

	} // namespace

	void TestVirtualInternal(int family) {
	std::unique_ptr<TestVirtualSocketServer> int_vss(
	new TestVirtualSocketServer());
	std::unique_ptr<TestVirtualSocketServer> ext_vss(
	new TestVirtualSocketServer());

	SocketAddress int_addr;
	SocketAddress ext_addrs[4];
	int_addr.SetIP(int_vss->GetNextIP(family));
	ext_addrs[0].SetIP(ext_vss->GetNextIP(int_addr.family()));
	ext_addrs[1].SetIP(ext_vss->GetNextIP(int_addr.family()));
	ext_addrs[2].SetIP(ext_addrs[0].ipaddr());
	ext_addrs[3].SetIP(ext_addrs[1].ipaddr());

	TestBindings(int_vss.get(), int_addr, ext_vss.get(), ext_addrs);
	TestFilters(int_vss.get(), int_addr, ext_vss.get(), ext_addrs);
	}

	TEST(NatTest, TestVirtualIPv4) {
	TestVirtualInternal(AF_INET);
	}

	TEST(NatTest, TestVirtualIPv6) {
	if (HasIPv6Enabled()) {
	TestVirtualInternal(AF_INET6);
	} else {
	RTC_LOG(LS_WARNING) << "No IPv6, skipping";
	}
	}

	class NatTcpTest : public testing::Test, public sigslot::has_slots<> {
	public:
	NatTcpTest()
	: int_addr_("192.168.0.1", 0),
	ext_addr_("10.0.0.1", 0),
	connected_(false),
	int_vss_(new TestVirtualSocketServer()),
	ext_vss_(new TestVirtualSocketServer()),
	int_thread_(new Thread(int_vss_.get())),
	ext_thread_(new Thread(ext_vss_.get())),
	nat_(new NATServer(NAT_OPEN_CONE,
	int_vss_.get(),
	int_addr_,
	int_addr_,
	ext_vss_.get(),
	ext_addr_)),
	natsf_(new NATSocketFactory(int_vss_.get(),
	nat_->internal_udp_address(),
	nat_->internal_tcp_address())) {
	int_thread_->Start();
	ext_thread_->Start();
	}

	void OnConnectEvent(AsyncSocket* socket) { connected_ = true; }

	void OnAcceptEvent(AsyncSocket* socket) {
	accepted_.reset(server_->Accept(nullptr));
	}

	void OnCloseEvent(AsyncSocket* socket, int error) {}

	void ConnectEvents() {
	server_->SignalReadEvent.connect(this, &NatTcpTest::OnAcceptEvent);
	client_->SignalConnectEvent.connect(this, &NatTcpTest::OnConnectEvent);
	}

	SocketAddress int_addr_;
	SocketAddress ext_addr_;
	bool connected_;
	std::unique_ptr<TestVirtualSocketServer> int_vss_;
	std::unique_ptr<TestVirtualSocketServer> ext_vss_;
	std::unique_ptr<Thread> int_thread_;
	std::unique_ptr<Thread> ext_thread_;
	std::unique_ptr<NATServer> nat_;
	std::unique_ptr<NATSocketFactory> natsf_;
	std::unique_ptr<AsyncSocket> client_;
	std::unique_ptr<AsyncSocket> server_;
	std::unique_ptr<AsyncSocket> accepted_;
	};

	TEST_F(NatTcpTest, DISABLED_TestConnectOut) {
	server_.reset(ext_vss_->CreateAsyncSocket(AF_INET, SOCK_STREAM));
	server_->Bind(ext_addr_);
	server_->Listen(5);

	client_.reset(natsf_->CreateAsyncSocket(AF_INET, SOCK_STREAM));
	EXPECT_GE(0, client_->Bind(int_addr_));
	EXPECT_GE(0, client_->Connect(server_->GetLocalAddress()));

	ConnectEvents();

	EXPECT_TRUE_WAIT(connected_, 1000);
	EXPECT_EQ(client_->GetRemoteAddress(), server_->GetLocalAddress());
	EXPECT_EQ(accepted_->GetRemoteAddress().ipaddr(), ext_addr_.ipaddr());

	std::unique_ptr<rtc::TestClient> in(CreateTCPTestClient(client_.release()));
	std::unique_ptr<rtc::TestClient> out(
	CreateTCPTestClient(accepted_.release()));

	const char* buf = "test_packet";
	size_t len = strlen(buf);

	in->Send(buf, len);
	SocketAddress trans_addr;
	EXPECT_TRUE(out->CheckNextPacket(buf, len, &trans_addr));

	out->Send(buf, len);
	EXPECT_TRUE(in->CheckNextPacket(buf, len, &trans_addr));
	}
	// #endif