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/*
* 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/stunrequest.h"
#include <algorithm>
#include "webrtc/base/common.h"
#include "webrtc/base/helpers.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/stringencode.h"
namespace cricket {
const uint32_t MSG_STUN_SEND = 1;
const int MAX_SENDS = 9;
const int DELAY_UNIT = 100; // 100 milliseconds
const int DELAY_MAX_FACTOR = 16;
StunRequestManager::StunRequestManager(rtc::Thread* thread)
: thread_(thread) {
}
StunRequestManager::~StunRequestManager() {
while (requests_.begin() != requests_.end()) {
StunRequest *request = requests_.begin()->second;
requests_.erase(requests_.begin());
delete request;
}
}
void StunRequestManager::Send(StunRequest* request) {
SendDelayed(request, 0);
}
void StunRequestManager::SendDelayed(StunRequest* request, int delay) {
request->set_manager(this);
ASSERT(requests_.find(request->id()) == requests_.end());
request->set_origin(origin_);
request->Construct();
requests_[request->id()] = request;
if (delay > 0) {
thread_->PostDelayed(delay, request, MSG_STUN_SEND, NULL);
} else {
thread_->Send(request, MSG_STUN_SEND, NULL);
}
}
void StunRequestManager::Flush(int msg_type) {
for (const auto kv : requests_) {
StunRequest* request = kv.second;
if (msg_type == kAllRequests || msg_type == request->type()) {
thread_->Clear(request, MSG_STUN_SEND);
thread_->Send(request, MSG_STUN_SEND, NULL);
}
}
}
void StunRequestManager::Remove(StunRequest* request) {
ASSERT(request->manager() == this);
RequestMap::iterator iter = requests_.find(request->id());
if (iter != requests_.end()) {
ASSERT(iter->second == request);
requests_.erase(iter);
thread_->Clear(request);
}
}
void StunRequestManager::Clear() {
std::vector<StunRequest*> requests;
for (RequestMap::iterator i = requests_.begin(); i != requests_.end(); ++i)
requests.push_back(i->second);
for (uint32_t i = 0; i < requests.size(); ++i) {
// StunRequest destructor calls Remove() which deletes requests
// from |requests_|.
delete requests[i];
}
}
bool StunRequestManager::CheckResponse(StunMessage* msg) {
RequestMap::iterator iter = requests_.find(msg->transaction_id());
if (iter == requests_.end()) {
// TODO(pthatcher): Log unknown responses without being too spammy
// in the logs.
return false;
}
StunRequest* request = iter->second;
if (msg->type() == GetStunSuccessResponseType(request->type())) {
request->OnResponse(msg);
} else if (msg->type() == GetStunErrorResponseType(request->type())) {
request->OnErrorResponse(msg);
} else {
LOG(LERROR) << "Received response with wrong type: " << msg->type()
<< " (expecting "
<< GetStunSuccessResponseType(request->type()) << ")";
return false;
}
delete request;
return true;
}
bool StunRequestManager::CheckResponse(const char* data, size_t size) {
// Check the appropriate bytes of the stream to see if they match the
// transaction ID of a response we are expecting.
if (size < 20)
return false;
std::string id;
id.append(data + kStunTransactionIdOffset, kStunTransactionIdLength);
RequestMap::iterator iter = requests_.find(id);
if (iter == requests_.end()) {
// TODO(pthatcher): Log unknown responses without being too spammy
// in the logs.
return false;
}
// Parse the STUN message and continue processing as usual.
rtc::ByteBuffer buf(data, size);
rtc::scoped_ptr<StunMessage> response(iter->second->msg_->CreateNew());
if (!response->Read(&buf)) {
LOG(LS_WARNING) << "Failed to read STUN response " << rtc::hex_encode(id);
return false;
}
return CheckResponse(response.get());
}
StunRequest::StunRequest()
: count_(0), timeout_(false), manager_(0),
msg_(new StunMessage()), tstamp_(0) {
msg_->SetTransactionID(
rtc::CreateRandomString(kStunTransactionIdLength));
}
StunRequest::StunRequest(StunMessage* request)
: count_(0), timeout_(false), manager_(0),
msg_(request), tstamp_(0) {
msg_->SetTransactionID(
rtc::CreateRandomString(kStunTransactionIdLength));
}
StunRequest::~StunRequest() {
ASSERT(manager_ != NULL);
if (manager_) {
manager_->Remove(this);
manager_->thread_->Clear(this);
}
delete msg_;
}
void StunRequest::Construct() {
if (msg_->type() == 0) {
if (!origin_.empty()) {
msg_->AddAttribute(new StunByteStringAttribute(STUN_ATTR_ORIGIN,
origin_));
}
Prepare(msg_);
ASSERT(msg_->type() != 0);
}
}
int StunRequest::type() {
ASSERT(msg_ != NULL);
return msg_->type();
}
const StunMessage* StunRequest::msg() const {
return msg_;
}
uint32_t StunRequest::Elapsed() const {
return rtc::TimeSince(tstamp_);
}
void StunRequest::set_manager(StunRequestManager* manager) {
ASSERT(!manager_);
manager_ = manager;
}
void StunRequest::OnMessage(rtc::Message* pmsg) {
ASSERT(manager_ != NULL);
ASSERT(pmsg->message_id == MSG_STUN_SEND);
if (timeout_) {
OnTimeout();
delete this;
return;
}
tstamp_ = rtc::Time();
rtc::ByteBuffer buf;
msg_->Write(&buf);
manager_->SignalSendPacket(buf.Data(), buf.Length(), this);
OnSent();
manager_->thread_->PostDelayed(resend_delay(), this, MSG_STUN_SEND, NULL);
}
void StunRequest::OnSent() {
count_ += 1;
if (count_ == MAX_SENDS)
timeout_ = true;
}
int StunRequest::resend_delay() {
if (count_ == 0) {
return 0;
}
return DELAY_UNIT * std::min(1 << (count_-1), DELAY_MAX_FACTOR);
}
} // namespace cricket
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