blob: 0ae3f60a8a9411c71b756a6ec47bf85dcb05cad7 [file] [log] [blame]
/*
* 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 "webrtc/p2p/base/stunport.h"
#include "webrtc/p2p/base/common.h"
#include "webrtc/p2p/base/portallocator.h"
#include "webrtc/p2p/base/stun.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/common.h"
#include "webrtc/base/helpers.h"
#include "webrtc/base/ipaddress.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/nethelpers.h"
namespace cricket {
// TODO: Move these to a common place (used in relayport too)
const int KEEPALIVE_DELAY = 10 * 1000; // 10 seconds - sort timeouts
const int RETRY_DELAY = 50; // 50ms, from ICE spec
const int RETRY_TIMEOUT = 50 * 1000; // ICE says 50 secs
// Handles a binding request sent to the STUN server.
class StunBindingRequest : public StunRequest {
public:
StunBindingRequest(UDPPort* port, bool keep_alive,
const rtc::SocketAddress& addr)
: port_(port), keep_alive_(keep_alive), server_addr_(addr) {
start_time_ = rtc::Time();
}
virtual ~StunBindingRequest() {
}
const rtc::SocketAddress& server_addr() const { return server_addr_; }
virtual void Prepare(StunMessage* request) override {
request->SetType(STUN_BINDING_REQUEST);
}
virtual void OnResponse(StunMessage* response) override {
const StunAddressAttribute* addr_attr =
response->GetAddress(STUN_ATTR_MAPPED_ADDRESS);
if (!addr_attr) {
LOG(LS_ERROR) << "Binding response missing mapped address.";
} else if (addr_attr->family() != STUN_ADDRESS_IPV4 &&
addr_attr->family() != STUN_ADDRESS_IPV6) {
LOG(LS_ERROR) << "Binding address has bad family";
} else {
rtc::SocketAddress addr(addr_attr->ipaddr(), addr_attr->port());
port_->OnStunBindingRequestSucceeded(server_addr_, addr);
}
// We will do a keep-alive regardless of whether this request succeeds.
// This should have almost no impact on network usage.
if (keep_alive_) {
port_->requests_.SendDelayed(
new StunBindingRequest(port_, true, server_addr_),
port_->stun_keepalive_delay());
}
}
virtual void OnErrorResponse(StunMessage* response) override {
const StunErrorCodeAttribute* attr = response->GetErrorCode();
if (!attr) {
LOG(LS_ERROR) << "Bad allocate response error code";
} else {
LOG(LS_ERROR) << "Binding error response:"
<< " class=" << attr->eclass()
<< " number=" << attr->number()
<< " reason='" << attr->reason() << "'";
}
port_->OnStunBindingOrResolveRequestFailed(server_addr_);
if (keep_alive_
&& (rtc::TimeSince(start_time_) <= RETRY_TIMEOUT)) {
port_->requests_.SendDelayed(
new StunBindingRequest(port_, true, server_addr_),
port_->stun_keepalive_delay());
}
}
virtual void OnTimeout() override {
LOG(LS_ERROR) << "Binding request timed out from "
<< port_->GetLocalAddress().ToSensitiveString()
<< " (" << port_->Network()->name() << ")";
port_->OnStunBindingOrResolveRequestFailed(server_addr_);
if (keep_alive_
&& (rtc::TimeSince(start_time_) <= RETRY_TIMEOUT)) {
port_->requests_.SendDelayed(
new StunBindingRequest(port_, true, server_addr_),
RETRY_DELAY);
}
}
private:
UDPPort* port_;
bool keep_alive_;
const rtc::SocketAddress server_addr_;
uint32_t start_time_;
};
UDPPort::AddressResolver::AddressResolver(
rtc::PacketSocketFactory* factory)
: socket_factory_(factory) {}
UDPPort::AddressResolver::~AddressResolver() {
for (ResolverMap::iterator it = resolvers_.begin();
it != resolvers_.end(); ++it) {
// TODO(guoweis): Change to asynchronous DNS resolution to prevent the hang
// when passing true to the Destroy() which is a safer way to avoid the code
// unloaded before the thread exits. Please see webrtc bug 5139.
it->second->Destroy(false);
}
}
void UDPPort::AddressResolver::Resolve(
const rtc::SocketAddress& address) {
if (resolvers_.find(address) != resolvers_.end())
return;
rtc::AsyncResolverInterface* resolver =
socket_factory_->CreateAsyncResolver();
resolvers_.insert(
std::pair<rtc::SocketAddress, rtc::AsyncResolverInterface*>(
address, resolver));
resolver->SignalDone.connect(this,
&UDPPort::AddressResolver::OnResolveResult);
resolver->Start(address);
}
bool UDPPort::AddressResolver::GetResolvedAddress(
const rtc::SocketAddress& input,
int family,
rtc::SocketAddress* output) const {
ResolverMap::const_iterator it = resolvers_.find(input);
if (it == resolvers_.end())
return false;
return it->second->GetResolvedAddress(family, output);
}
void UDPPort::AddressResolver::OnResolveResult(
rtc::AsyncResolverInterface* resolver) {
for (ResolverMap::iterator it = resolvers_.begin();
it != resolvers_.end(); ++it) {
if (it->second == resolver) {
SignalDone(it->first, resolver->GetError());
return;
}
}
}
UDPPort::UDPPort(rtc::Thread* thread,
rtc::PacketSocketFactory* factory,
rtc::Network* network,
rtc::AsyncPacketSocket* socket,
const std::string& username,
const std::string& password,
const std::string& origin,
bool emit_local_for_anyaddress)
: Port(thread,
factory,
network,
socket->GetLocalAddress().ipaddr(),
username,
password),
requests_(thread),
socket_(socket),
error_(0),
ready_(false),
stun_keepalive_delay_(KEEPALIVE_DELAY),
emit_local_for_anyaddress_(emit_local_for_anyaddress) {
requests_.set_origin(origin);
}
UDPPort::UDPPort(rtc::Thread* thread,
rtc::PacketSocketFactory* factory,
rtc::Network* network,
const rtc::IPAddress& ip,
uint16_t min_port,
uint16_t max_port,
const std::string& username,
const std::string& password,
const std::string& origin,
bool emit_local_for_anyaddress)
: Port(thread,
LOCAL_PORT_TYPE,
factory,
network,
ip,
min_port,
max_port,
username,
password),
requests_(thread),
socket_(NULL),
error_(0),
ready_(false),
stun_keepalive_delay_(KEEPALIVE_DELAY),
emit_local_for_anyaddress_(emit_local_for_anyaddress) {
requests_.set_origin(origin);
}
bool UDPPort::Init() {
if (!SharedSocket()) {
ASSERT(socket_ == NULL);
socket_ = socket_factory()->CreateUdpSocket(
rtc::SocketAddress(ip(), 0), min_port(), max_port());
if (!socket_) {
LOG_J(LS_WARNING, this) << "UDP socket creation failed";
return false;
}
socket_->SignalReadPacket.connect(this, &UDPPort::OnReadPacket);
}
socket_->SignalSentPacket.connect(this, &UDPPort::OnSentPacket);
socket_->SignalReadyToSend.connect(this, &UDPPort::OnReadyToSend);
socket_->SignalAddressReady.connect(this, &UDPPort::OnLocalAddressReady);
requests_.SignalSendPacket.connect(this, &UDPPort::OnSendPacket);
return true;
}
UDPPort::~UDPPort() {
if (!SharedSocket())
delete socket_;
}
void UDPPort::PrepareAddress() {
ASSERT(requests_.empty());
if (socket_->GetState() == rtc::AsyncPacketSocket::STATE_BOUND) {
OnLocalAddressReady(socket_, socket_->GetLocalAddress());
}
}
void UDPPort::MaybePrepareStunCandidate() {
// Sending binding request to the STUN server if address is available to
// prepare STUN candidate.
if (!server_addresses_.empty()) {
SendStunBindingRequests();
} else {
// Port is done allocating candidates.
MaybeSetPortCompleteOrError();
}
}
Connection* UDPPort::CreateConnection(const Candidate& address,
CandidateOrigin origin) {
if (address.protocol() != "udp")
return NULL;
if (!IsCompatibleAddress(address.address())) {
return NULL;
}
if (SharedSocket() && Candidates()[0].type() != LOCAL_PORT_TYPE) {
ASSERT(false);
return NULL;
}
Connection* conn = new ProxyConnection(this, 0, address);
AddConnection(conn);
return conn;
}
int UDPPort::SendTo(const void* data, size_t size,
const rtc::SocketAddress& addr,
const rtc::PacketOptions& options,
bool payload) {
int sent = socket_->SendTo(data, size, addr, options);
if (sent < 0) {
error_ = socket_->GetError();
LOG_J(LS_ERROR, this) << "UDP send of " << size
<< " bytes failed with error " << error_;
}
return sent;
}
int UDPPort::SetOption(rtc::Socket::Option opt, int value) {
return socket_->SetOption(opt, value);
}
int UDPPort::GetOption(rtc::Socket::Option opt, int* value) {
return socket_->GetOption(opt, value);
}
int UDPPort::GetError() {
return error_;
}
void UDPPort::OnLocalAddressReady(rtc::AsyncPacketSocket* socket,
const rtc::SocketAddress& address) {
// When adapter enumeration is disabled and binding to the any address, the
// default local address will be issued as a candidate instead if
// |emit_local_for_anyaddress| is true. This is to allow connectivity for
// applications which absolutely requires a HOST candidate.
rtc::SocketAddress addr = address;
// If MaybeSetDefaultLocalAddress fails, we keep the "any" IP so that at
// least the port is listening.
MaybeSetDefaultLocalAddress(&addr);
AddAddress(addr, addr, rtc::SocketAddress(), UDP_PROTOCOL_NAME, "", "",
LOCAL_PORT_TYPE, ICE_TYPE_PREFERENCE_HOST, 0, false);
MaybePrepareStunCandidate();
}
void UDPPort::OnReadPacket(rtc::AsyncPacketSocket* socket,
const char* data,
size_t size,
const rtc::SocketAddress& remote_addr,
const rtc::PacketTime& packet_time) {
ASSERT(socket == socket_);
ASSERT(!remote_addr.IsUnresolvedIP());
// Look for a response from the STUN server.
// Even if the response doesn't match one of our outstanding requests, we
// will eat it because it might be a response to a retransmitted packet, and
// we already cleared the request when we got the first response.
if (server_addresses_.find(remote_addr) != server_addresses_.end()) {
requests_.CheckResponse(data, size);
return;
}
if (Connection* conn = GetConnection(remote_addr)) {
conn->OnReadPacket(data, size, packet_time);
} else {
Port::OnReadPacket(data, size, remote_addr, PROTO_UDP);
}
}
void UDPPort::OnSentPacket(rtc::AsyncPacketSocket* socket,
const rtc::SentPacket& sent_packet) {
Port::OnSentPacket(sent_packet);
}
void UDPPort::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
Port::OnReadyToSend();
}
void UDPPort::SendStunBindingRequests() {
// We will keep pinging the stun server to make sure our NAT pin-hole stays
// open during the call.
ASSERT(requests_.empty());
for (ServerAddresses::const_iterator it = server_addresses_.begin();
it != server_addresses_.end(); ++it) {
SendStunBindingRequest(*it);
}
}
void UDPPort::ResolveStunAddress(const rtc::SocketAddress& stun_addr) {
if (!resolver_) {
resolver_.reset(new AddressResolver(socket_factory()));
resolver_->SignalDone.connect(this, &UDPPort::OnResolveResult);
}
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, true, stun_addr));
} 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) {
return false;
}
RTC_DCHECK(!default_address.IsNil())
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) ||
!(candidate_filter() & CF_HOST)) {
// If candidate filter doesn't have CF_HOST specified, empty raddr to
// avoid local address leakage.
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