517 lines
17 KiB
C++
517 lines
17 KiB
C++
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/*
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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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#include "webrtc/p2p/base/stunport.h"
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#include "webrtc/p2p/base/common.h"
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#include "webrtc/p2p/base/portallocator.h"
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#include "webrtc/p2p/base/stun.h"
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#include "webrtc/base/checks.h"
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#include "webrtc/base/common.h"
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#include "webrtc/base/helpers.h"
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#include "webrtc/base/ipaddress.h"
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#include "webrtc/base/logging.h"
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#include "webrtc/base/nethelpers.h"
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namespace cricket {
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// TODO: Move these to a common place (used in relayport too)
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const int KEEPALIVE_DELAY = 10 * 1000; // 10 seconds - sort timeouts
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const int RETRY_TIMEOUT = 50 * 1000; // 50 seconds
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// Handles a binding request sent to the STUN server.
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class StunBindingRequest : public StunRequest {
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public:
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StunBindingRequest(UDPPort* port,
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const rtc::SocketAddress& addr,
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int64_t start_time)
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: port_(port), server_addr_(addr), start_time_(start_time) {}
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virtual ~StunBindingRequest() {
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}
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const rtc::SocketAddress& server_addr() const { return server_addr_; }
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virtual void Prepare(StunMessage* request) override {
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request->SetType(STUN_BINDING_REQUEST);
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}
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virtual void OnResponse(StunMessage* response) override {
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const StunAddressAttribute* addr_attr =
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response->GetAddress(STUN_ATTR_MAPPED_ADDRESS);
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if (!addr_attr) {
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LOG(LS_ERROR) << "Binding response missing mapped address.";
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} else if (addr_attr->family() != STUN_ADDRESS_IPV4 &&
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addr_attr->family() != STUN_ADDRESS_IPV6) {
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LOG(LS_ERROR) << "Binding address has bad family";
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} else {
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rtc::SocketAddress addr(addr_attr->ipaddr(), addr_attr->port());
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port_->OnStunBindingRequestSucceeded(server_addr_, addr);
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}
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// The keep-alive requests will be stopped after its lifetime has passed.
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if (WithinLifetime(rtc::TimeMillis())) {
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port_->requests_.SendDelayed(
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new StunBindingRequest(port_, server_addr_, start_time_),
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port_->stun_keepalive_delay());
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}
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}
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virtual void OnErrorResponse(StunMessage* response) override {
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const StunErrorCodeAttribute* attr = response->GetErrorCode();
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if (!attr) {
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LOG(LS_ERROR) << "Bad allocate response error code";
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} else {
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LOG(LS_ERROR) << "Binding error response:"
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<< " class=" << attr->eclass()
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<< " number=" << attr->number() << " reason='"
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<< attr->reason() << "'";
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}
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port_->OnStunBindingOrResolveRequestFailed(server_addr_);
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int64_t now = rtc::TimeMillis();
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if (WithinLifetime(now) &&
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rtc::TimeDiff(now, start_time_) < RETRY_TIMEOUT) {
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port_->requests_.SendDelayed(
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new StunBindingRequest(port_, server_addr_, start_time_),
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port_->stun_keepalive_delay());
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}
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}
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virtual void OnTimeout() override {
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LOG(LS_ERROR) << "Binding request timed out from "
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<< port_->GetLocalAddress().ToSensitiveString() << " ("
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<< port_->Network()->name() << ")";
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port_->OnStunBindingOrResolveRequestFailed(server_addr_);
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}
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private:
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// Returns true if |now| is within the lifetime of the request (a negative
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// lifetime means infinite).
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bool WithinLifetime(int64_t now) const {
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int lifetime = port_->stun_keepalive_lifetime();
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return lifetime < 0 || rtc::TimeDiff(now, start_time_) <= lifetime;
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}
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UDPPort* port_;
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const rtc::SocketAddress server_addr_;
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int64_t start_time_;
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};
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UDPPort::AddressResolver::AddressResolver(
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rtc::PacketSocketFactory* factory)
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: socket_factory_(factory) {}
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UDPPort::AddressResolver::~AddressResolver() {
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for (ResolverMap::iterator it = resolvers_.begin();
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it != resolvers_.end(); ++it) {
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// TODO(guoweis): Change to asynchronous DNS resolution to prevent the hang
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// when passing true to the Destroy() which is a safer way to avoid the code
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// unloaded before the thread exits. Please see webrtc bug 5139.
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it->second->Destroy(false);
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}
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}
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void UDPPort::AddressResolver::Resolve(
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const rtc::SocketAddress& address) {
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if (resolvers_.find(address) != resolvers_.end())
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return;
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rtc::AsyncResolverInterface* resolver =
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socket_factory_->CreateAsyncResolver();
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resolvers_.insert(
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std::pair<rtc::SocketAddress, rtc::AsyncResolverInterface*>(
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address, resolver));
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resolver->SignalDone.connect(this,
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&UDPPort::AddressResolver::OnResolveResult);
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resolver->Start(address);
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}
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bool UDPPort::AddressResolver::GetResolvedAddress(
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const rtc::SocketAddress& input,
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int family,
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rtc::SocketAddress* output) const {
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ResolverMap::const_iterator it = resolvers_.find(input);
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if (it == resolvers_.end())
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return false;
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return it->second->GetResolvedAddress(family, output);
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}
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void UDPPort::AddressResolver::OnResolveResult(
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rtc::AsyncResolverInterface* resolver) {
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for (ResolverMap::iterator it = resolvers_.begin();
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it != resolvers_.end(); ++it) {
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if (it->second == resolver) {
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SignalDone(it->first, resolver->GetError());
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return;
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}
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}
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}
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UDPPort::UDPPort(rtc::Thread* thread,
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rtc::PacketSocketFactory* factory,
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rtc::Network* network,
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rtc::AsyncPacketSocket* socket,
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const std::string& username,
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const std::string& password,
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const std::string& origin,
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bool emit_local_for_anyaddress)
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: Port(thread,
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factory,
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network,
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socket->GetLocalAddress().ipaddr(),
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username,
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password),
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requests_(thread),
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socket_(socket),
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error_(0),
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ready_(false),
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stun_keepalive_delay_(KEEPALIVE_DELAY),
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emit_local_for_anyaddress_(emit_local_for_anyaddress) {
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requests_.set_origin(origin);
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}
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UDPPort::UDPPort(rtc::Thread* thread,
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rtc::PacketSocketFactory* factory,
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rtc::Network* network,
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const rtc::IPAddress& ip,
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uint16_t min_port,
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uint16_t max_port,
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const std::string& username,
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const std::string& password,
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const std::string& origin,
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bool emit_local_for_anyaddress)
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: Port(thread,
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LOCAL_PORT_TYPE,
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factory,
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network,
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ip,
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min_port,
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max_port,
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username,
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password),
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requests_(thread),
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socket_(NULL),
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error_(0),
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ready_(false),
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stun_keepalive_delay_(KEEPALIVE_DELAY),
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emit_local_for_anyaddress_(emit_local_for_anyaddress) {
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requests_.set_origin(origin);
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}
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bool UDPPort::Init() {
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stun_keepalive_lifetime_ = GetStunKeepaliveLifetime();
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if (!SharedSocket()) {
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ASSERT(socket_ == NULL);
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socket_ = socket_factory()->CreateUdpSocket(
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rtc::SocketAddress(ip(), 0), min_port(), max_port());
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if (!socket_) {
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LOG_J(LS_WARNING, this) << "UDP socket creation failed";
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return false;
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}
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socket_->SignalReadPacket.connect(this, &UDPPort::OnReadPacket);
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}
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socket_->SignalSentPacket.connect(this, &UDPPort::OnSentPacket);
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socket_->SignalReadyToSend.connect(this, &UDPPort::OnReadyToSend);
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socket_->SignalAddressReady.connect(this, &UDPPort::OnLocalAddressReady);
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requests_.SignalSendPacket.connect(this, &UDPPort::OnSendPacket);
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return true;
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}
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UDPPort::~UDPPort() {
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if (!SharedSocket())
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delete socket_;
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}
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void UDPPort::PrepareAddress() {
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ASSERT(requests_.empty());
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if (socket_->GetState() == rtc::AsyncPacketSocket::STATE_BOUND) {
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OnLocalAddressReady(socket_, socket_->GetLocalAddress());
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}
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}
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void UDPPort::MaybePrepareStunCandidate() {
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// Sending binding request to the STUN server if address is available to
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// prepare STUN candidate.
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if (!server_addresses_.empty()) {
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SendStunBindingRequests();
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} else {
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// Port is done allocating candidates.
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MaybeSetPortCompleteOrError();
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}
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}
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Connection* UDPPort::CreateConnection(const Candidate& address,
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CandidateOrigin origin) {
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if (!SupportsProtocol(address.protocol())) {
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return NULL;
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}
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if (!IsCompatibleAddress(address.address())) {
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return NULL;
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}
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if (SharedSocket() && Candidates()[0].type() != LOCAL_PORT_TYPE) {
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ASSERT(false);
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return NULL;
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}
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Connection* conn = new ProxyConnection(this, 0, address);
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AddOrReplaceConnection(conn);
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return conn;
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}
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int UDPPort::SendTo(const void* data, size_t size,
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const rtc::SocketAddress& addr,
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const rtc::PacketOptions& options,
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bool payload) {
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int sent = socket_->SendTo(data, size, addr, options);
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if (sent < 0) {
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error_ = socket_->GetError();
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LOG_J(LS_ERROR, this) << "UDP send of " << size
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<< " bytes failed with error " << error_;
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}
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return sent;
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}
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void UDPPort::UpdateNetworkCost() {
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Port::UpdateNetworkCost();
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stun_keepalive_lifetime_ = GetStunKeepaliveLifetime();
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}
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int UDPPort::SetOption(rtc::Socket::Option opt, int value) {
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return socket_->SetOption(opt, value);
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}
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int UDPPort::GetOption(rtc::Socket::Option opt, int* value) {
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return socket_->GetOption(opt, value);
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}
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int UDPPort::GetError() {
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return error_;
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}
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void UDPPort::OnLocalAddressReady(rtc::AsyncPacketSocket* socket,
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const rtc::SocketAddress& address) {
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// When adapter enumeration is disabled and binding to the any address, the
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// default local address will be issued as a candidate instead if
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// |emit_local_for_anyaddress| is true. This is to allow connectivity for
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// applications which absolutely requires a HOST candidate.
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rtc::SocketAddress addr = address;
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// If MaybeSetDefaultLocalAddress fails, we keep the "any" IP so that at
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// least the port is listening.
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MaybeSetDefaultLocalAddress(&addr);
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AddAddress(addr, addr, rtc::SocketAddress(), UDP_PROTOCOL_NAME, "", "",
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LOCAL_PORT_TYPE, ICE_TYPE_PREFERENCE_HOST, 0, false);
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MaybePrepareStunCandidate();
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}
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void UDPPort::OnReadPacket(rtc::AsyncPacketSocket* socket,
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const char* data,
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size_t size,
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const rtc::SocketAddress& remote_addr,
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const rtc::PacketTime& packet_time) {
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ASSERT(socket == socket_);
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ASSERT(!remote_addr.IsUnresolvedIP());
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// Look for a response from the STUN server.
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// Even if the response doesn't match one of our outstanding requests, we
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// will eat it because it might be a response to a retransmitted packet, and
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// we already cleared the request when we got the first response.
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if (server_addresses_.find(remote_addr) != server_addresses_.end()) {
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requests_.CheckResponse(data, size);
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return;
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}
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if (Connection* conn = GetConnection(remote_addr)) {
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conn->OnReadPacket(data, size, packet_time);
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} else {
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Port::OnReadPacket(data, size, remote_addr, PROTO_UDP);
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}
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}
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void UDPPort::OnSentPacket(rtc::AsyncPacketSocket* socket,
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const rtc::SentPacket& sent_packet) {
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PortInterface::SignalSentPacket(sent_packet);
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}
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void UDPPort::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
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Port::OnReadyToSend();
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}
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void UDPPort::SendStunBindingRequests() {
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// We will keep pinging the stun server to make sure our NAT pin-hole stays
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// open until the deadline (specified in SendStunBindingRequest).
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ASSERT(requests_.empty());
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for (ServerAddresses::const_iterator it = server_addresses_.begin();
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it != server_addresses_.end(); ++it) {
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SendStunBindingRequest(*it);
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}
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}
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void UDPPort::ResolveStunAddress(const rtc::SocketAddress& stun_addr) {
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if (!resolver_) {
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resolver_.reset(new AddressResolver(socket_factory()));
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resolver_->SignalDone.connect(this, &UDPPort::OnResolveResult);
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}
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LOG_J(LS_INFO, this) << "Starting STUN host lookup for "
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<< stun_addr.ToSensitiveString();
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resolver_->Resolve(stun_addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
void UDPPort::OnResolveResult(const rtc::SocketAddress& input,
|
||
|
|
int error) {
|
||
|
|
ASSERT(resolver_.get() != NULL);
|
||
|
|
|
||
|
|
rtc::SocketAddress resolved;
|
||
|
|
if (error != 0 ||
|
||
|
|
!resolver_->GetResolvedAddress(input, ip().family(), &resolved)) {
|
||
|
|
LOG_J(LS_WARNING, this) << "StunPort: stun host lookup received error "
|
||
|
|
<< error;
|
||
|
|
OnStunBindingOrResolveRequestFailed(input);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
server_addresses_.erase(input);
|
||
|
|
|
||
|
|
if (server_addresses_.find(resolved) == server_addresses_.end()) {
|
||
|
|
server_addresses_.insert(resolved);
|
||
|
|
SendStunBindingRequest(resolved);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void UDPPort::SendStunBindingRequest(const rtc::SocketAddress& stun_addr) {
|
||
|
|
if (stun_addr.IsUnresolvedIP()) {
|
||
|
|
ResolveStunAddress(stun_addr);
|
||
|
|
|
||
|
|
} else if (socket_->GetState() == rtc::AsyncPacketSocket::STATE_BOUND) {
|
||
|
|
// Check if |server_addr_| is compatible with the port's ip.
|
||
|
|
if (IsCompatibleAddress(stun_addr)) {
|
||
|
|
requests_.Send(
|
||
|
|
new StunBindingRequest(this, stun_addr, rtc::TimeMillis()));
|
||
|
|
} else {
|
||
|
|
// Since we can't send stun messages to the server, we should mark this
|
||
|
|
// port ready.
|
||
|
|
LOG(LS_WARNING) << "STUN server address is incompatible.";
|
||
|
|
OnStunBindingOrResolveRequestFailed(stun_addr);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool UDPPort::MaybeSetDefaultLocalAddress(rtc::SocketAddress* addr) const {
|
||
|
|
if (!addr->IsAnyIP() || !emit_local_for_anyaddress_ ||
|
||
|
|
!Network()->default_local_address_provider()) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
rtc::IPAddress default_address;
|
||
|
|
bool result =
|
||
|
|
Network()->default_local_address_provider()->GetDefaultLocalAddress(
|
||
|
|
addr->family(), &default_address);
|
||
|
|
if (!result || default_address.IsNil()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
addr->SetIP(default_address);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
void UDPPort::OnStunBindingRequestSucceeded(
|
||
|
|
const rtc::SocketAddress& stun_server_addr,
|
||
|
|
const rtc::SocketAddress& stun_reflected_addr) {
|
||
|
|
if (bind_request_succeeded_servers_.find(stun_server_addr) !=
|
||
|
|
bind_request_succeeded_servers_.end()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
bind_request_succeeded_servers_.insert(stun_server_addr);
|
||
|
|
|
||
|
|
// If socket is shared and |stun_reflected_addr| is equal to local socket
|
||
|
|
// address, or if the same address has been added by another STUN server,
|
||
|
|
// then discarding the stun address.
|
||
|
|
// For STUN, related address is the local socket address.
|
||
|
|
if ((!SharedSocket() || stun_reflected_addr != socket_->GetLocalAddress()) &&
|
||
|
|
!HasCandidateWithAddress(stun_reflected_addr)) {
|
||
|
|
|
||
|
|
rtc::SocketAddress related_address = socket_->GetLocalAddress();
|
||
|
|
// If we can't stamp the related address correctly, empty it to avoid leak.
|
||
|
|
if (!MaybeSetDefaultLocalAddress(&related_address)) {
|
||
|
|
related_address = rtc::EmptySocketAddressWithFamily(
|
||
|
|
related_address.family());
|
||
|
|
}
|
||
|
|
|
||
|
|
AddAddress(stun_reflected_addr, socket_->GetLocalAddress(), related_address,
|
||
|
|
UDP_PROTOCOL_NAME, "", "", STUN_PORT_TYPE,
|
||
|
|
ICE_TYPE_PREFERENCE_SRFLX, 0, false);
|
||
|
|
}
|
||
|
|
MaybeSetPortCompleteOrError();
|
||
|
|
}
|
||
|
|
|
||
|
|
void UDPPort::OnStunBindingOrResolveRequestFailed(
|
||
|
|
const rtc::SocketAddress& stun_server_addr) {
|
||
|
|
if (bind_request_failed_servers_.find(stun_server_addr) !=
|
||
|
|
bind_request_failed_servers_.end()) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
bind_request_failed_servers_.insert(stun_server_addr);
|
||
|
|
MaybeSetPortCompleteOrError();
|
||
|
|
}
|
||
|
|
|
||
|
|
void UDPPort::MaybeSetPortCompleteOrError() {
|
||
|
|
if (ready_)
|
||
|
|
return;
|
||
|
|
|
||
|
|
// Do not set port ready if we are still waiting for bind responses.
|
||
|
|
const size_t servers_done_bind_request = bind_request_failed_servers_.size() +
|
||
|
|
bind_request_succeeded_servers_.size();
|
||
|
|
if (server_addresses_.size() != servers_done_bind_request) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Setting ready status.
|
||
|
|
ready_ = true;
|
||
|
|
|
||
|
|
// The port is "completed" if there is no stun server provided, or the bind
|
||
|
|
// request succeeded for any stun server, or the socket is shared.
|
||
|
|
if (server_addresses_.empty() ||
|
||
|
|
bind_request_succeeded_servers_.size() > 0 ||
|
||
|
|
SharedSocket()) {
|
||
|
|
SignalPortComplete(this);
|
||
|
|
} else {
|
||
|
|
SignalPortError(this);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: merge this with SendTo above.
|
||
|
|
void UDPPort::OnSendPacket(const void* data, size_t size, StunRequest* req) {
|
||
|
|
StunBindingRequest* sreq = static_cast<StunBindingRequest*>(req);
|
||
|
|
rtc::PacketOptions options(DefaultDscpValue());
|
||
|
|
if (socket_->SendTo(data, size, sreq->server_addr(), options) < 0)
|
||
|
|
PLOG(LERROR, socket_->GetError()) << "sendto";
|
||
|
|
}
|
||
|
|
|
||
|
|
bool UDPPort::HasCandidateWithAddress(const rtc::SocketAddress& addr) const {
|
||
|
|
const std::vector<Candidate>& existing_candidates = Candidates();
|
||
|
|
std::vector<Candidate>::const_iterator it = existing_candidates.begin();
|
||
|
|
for (; it != existing_candidates.end(); ++it) {
|
||
|
|
if (it->address() == addr)
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace cricket
|