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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(_MSC_VER) && _MSC_VER < 1300
#pragma warning(disable:4786)
#endif
#include "talk/base/logging.h"
#include "talk/p2p/base/stunport.h"
#include "talk/p2p/base/helpers.h"
#include <iostream>
#include <cassert>
#if defined(_MSC_VER) && _MSC_VER < 1300
namespace std {
using ::strerror;
}
#endif
#ifdef POSIX
extern "C" {
#include <errno.h>
}
#endif // POSIX
namespace cricket {
const int KEEPALIVE_DELAY = 10 * 1000; // 10 seconds - sort timeouts
const int RETRY_DELAY = 50; // 50ms, from ICE spec
const uint32 RETRY_TIMEOUT = 50 * 1000; // ICE says 50 secs
// Handles a binding request sent to the STUN server.
class StunPortBindingRequest : public StunRequest {
public:
StunPortBindingRequest(StunPort* port) : port_(port) {
start_time_ = GetMillisecondCount();
}
virtual ~StunPortBindingRequest() {
}
virtual void Prepare(StunMessage* request) {
request->SetType(STUN_BINDING_REQUEST);
}
virtual void OnResponse(StunMessage* response) {
const StunAddressAttribute* addr_attr =
response->GetAddress(STUN_ATTR_MAPPED_ADDRESS);
if (!addr_attr) {
LOG(LERROR) << "Binding response missing mapped address.";
} else if (addr_attr->family() != 1) {
LOG(LERROR) << "Binding address has bad family";
} else {
SocketAddress addr(addr_attr->ip(), addr_attr->port());
if (port_->candidates().empty())
port_->add_address(addr, "udp");
}
// We will do a keep-alive regardless of whether this request suceeds.
// This should have almost no impact on network usage.
port_->requests_.SendDelayed(new StunPortBindingRequest(port_), KEEPALIVE_DELAY);
}
virtual void OnErrorResponse(StunMessage* response) {
const StunErrorCodeAttribute* attr = response->GetErrorCode();
if (!attr) {
LOG(LERROR) << "Bad allocate response error code";
} else {
LOG(LERROR) << "Binding error response:"
<< " class=" << attr->error_class()
<< " number=" << attr->number()
<< " reason='" << attr->reason() << "'";
}
if (GetMillisecondCount() - start_time_ <= RETRY_TIMEOUT)
port_->requests_.SendDelayed(new StunPortBindingRequest(port_), KEEPALIVE_DELAY);
}
virtual void OnTimeout() {
LOG(LERROR) << "Binding request timed out";
if (GetMillisecondCount() - start_time_ <= RETRY_TIMEOUT)
port_->requests_.SendDelayed(new StunPortBindingRequest(port_), RETRY_DELAY);
}
private:
uint32 start_time_;
StunPort* port_;
};
const std::string STUN_PORT_TYPE("stun");
StunPort::StunPort(Thread* thread, SocketFactory* factory, Network* network,
const SocketAddress& local_addr,
const SocketAddress& server_addr)
: UDPPort(thread, STUN_PORT_TYPE, factory, network),
server_addr_(server_addr), requests_(thread), error_(0) {
socket_ = CreatePacketSocket(PROTO_UDP);
socket_->SignalReadPacket.connect(this, &StunPort::OnReadPacket);
if (socket_->Bind(local_addr) < 0)
PLOG(LERROR, socket_->GetError()) << "bind";
requests_.SignalSendPacket.connect(this, &StunPort::OnSendPacket);
}
StunPort::~StunPort() {
delete socket_;
}
void StunPort::PrepareAddress() {
requests_.Send(new StunPortBindingRequest(this));
}
int StunPort::SendTo(
const void* data, size_t size, const SocketAddress& addr, bool payload) {
int sent = socket_->SendTo(data, size, addr);
if (sent < 0)
error_ = socket_->GetError();
return sent;
}
int StunPort::SetOption(Socket::Option opt, int value) {
return socket_->SetOption(opt, value);
}
int StunPort::GetError() {
return error_;
}
void StunPort::OnReadPacket(
const char* data, size_t size, const SocketAddress& remote_addr,
AsyncPacketSocket* socket) {
assert(socket == socket_);
// Look for a response to a binding request.
if (requests_.CheckResponse(data, size))
return;
// Process this data packet in the normal manner.
UDPPort::OnReadPacket(data, size, remote_addr);
}
void StunPort::OnSendPacket(const void* data, size_t size) {
if (socket_->SendTo(data, size, server_addr_) < 0)
PLOG(LERROR, socket_->GetError()) << "sendto";
}
} // namespace cricket
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