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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/p2ptransport.h"
#include <string>
#include <vector>
#include "webrtc/p2p/base/constants.h"
#include "webrtc/p2p/base/p2ptransportchannel.h"
#include "webrtc/libjingle/session/parsing.h"
#include "webrtc/libjingle/session/sessionmanager.h"
#include "webrtc/libjingle/session/sessionmessages.h"
#include "webrtc/libjingle/xmllite/qname.h"
#include "webrtc/libjingle/xmllite/xmlelement.h"
#include "webrtc/libjingle/xmpp/constants.h"
#include "webrtc/base/base64.h"
#include "webrtc/base/common.h"
#include "webrtc/base/stringencode.h"
#include "webrtc/base/stringutils.h"
namespace {
// Limits for GICE and ICE username sizes.
const size_t kMaxGiceUsernameSize = 16;
const size_t kMaxIceUsernameSize = 512;
} // namespace
namespace cricket {
static buzz::XmlElement* NewTransportElement(const std::string& name) {
return new buzz::XmlElement(buzz::QName(name, LN_TRANSPORT), true);
}
P2PTransport::P2PTransport(rtc::Thread* signaling_thread,
rtc::Thread* worker_thread,
const std::string& content_name,
PortAllocator* allocator)
: Transport(signaling_thread, worker_thread,
content_name, NS_GINGLE_P2P, allocator) {
}
P2PTransport::~P2PTransport() {
DestroyAllChannels();
}
TransportChannelImpl* P2PTransport::CreateTransportChannel(int component) {
return new P2PTransportChannel(content_name(), component, this,
port_allocator());
}
void P2PTransport::DestroyTransportChannel(TransportChannelImpl* channel) {
delete channel;
}
bool P2PTransportParser::ParseTransportDescription(
const buzz::XmlElement* elem,
const CandidateTranslator* translator,
TransportDescription* desc,
ParseError* error) {
ASSERT(elem->Name().LocalPart() == LN_TRANSPORT);
desc->transport_type = elem->Name().Namespace();
if (desc->transport_type != NS_GINGLE_P2P)
return BadParse("Unsupported transport type", error);
for (const buzz::XmlElement* candidate_elem = elem->FirstElement();
candidate_elem != NULL;
candidate_elem = candidate_elem->NextElement()) {
// Only look at local part because the namespace might (eventually)
// be NS_GINGLE_P2P or NS_JINGLE_ICE_UDP.
if (candidate_elem->Name().LocalPart() == LN_CANDIDATE) {
Candidate candidate;
if (!ParseCandidate(ICEPROTO_GOOGLE, candidate_elem, translator,
&candidate, error)) {
return false;
}
desc->candidates.push_back(candidate);
}
}
return true;
}
bool P2PTransportParser::WriteTransportDescription(
const TransportDescription& desc,
const CandidateTranslator* translator,
buzz::XmlElement** out_elem,
WriteError* error) {
TransportProtocol proto = TransportProtocolFromDescription(&desc);
rtc::scoped_ptr<buzz::XmlElement> trans_elem(
NewTransportElement(desc.transport_type));
// Fail if we get HYBRID or ICE right now.
// TODO(juberti): Add ICE and HYBRID serialization.
if (proto != ICEPROTO_GOOGLE) {
LOG(LS_ERROR) << "Failed to serialize non-GICE TransportDescription";
return false;
}
for (std::vector<Candidate>::const_iterator iter = desc.candidates.begin();
iter != desc.candidates.end(); ++iter) {
rtc::scoped_ptr<buzz::XmlElement> cand_elem(
new buzz::XmlElement(QN_GINGLE_P2P_CANDIDATE));
if (!WriteCandidate(proto, *iter, translator, cand_elem.get(), error)) {
return false;
}
trans_elem->AddElement(cand_elem.release());
}
*out_elem = trans_elem.release();
return true;
}
bool P2PTransportParser::ParseGingleCandidate(
const buzz::XmlElement* elem,
const CandidateTranslator* translator,
Candidate* candidate,
ParseError* error) {
return ParseCandidate(ICEPROTO_GOOGLE, elem, translator, candidate, error);
}
bool P2PTransportParser::WriteGingleCandidate(
const Candidate& candidate,
const CandidateTranslator* translator,
buzz::XmlElement** out_elem,
WriteError* error) {
rtc::scoped_ptr<buzz::XmlElement> elem(
new buzz::XmlElement(QN_GINGLE_CANDIDATE));
bool ret = WriteCandidate(ICEPROTO_GOOGLE, candidate, translator, elem.get(),
error);
if (ret) {
*out_elem = elem.release();
}
return ret;
}
bool P2PTransportParser::VerifyUsernameFormat(TransportProtocol proto,
const std::string& username,
ParseError* error) {
if (proto == ICEPROTO_GOOGLE || proto == ICEPROTO_HYBRID) {
if (username.size() > kMaxGiceUsernameSize)
return BadParse("candidate username is too long", error);
if (!rtc::Base64::IsBase64Encoded(username))
return BadParse("candidate username has non-base64 encoded characters",
error);
} else if (proto == ICEPROTO_RFC5245) {
if (username.size() > kMaxIceUsernameSize)
return BadParse("candidate username is too long", error);
}
return true;
}
bool P2PTransportParser::ParseCandidate(TransportProtocol proto,
const buzz::XmlElement* elem,
const CandidateTranslator* translator,
Candidate* candidate,
ParseError* error) {
ASSERT(proto == ICEPROTO_GOOGLE);
ASSERT(translator != NULL);
if (!elem->HasAttr(buzz::QN_NAME) ||
!elem->HasAttr(QN_ADDRESS) ||
!elem->HasAttr(QN_PORT) ||
!elem->HasAttr(QN_USERNAME) ||
!elem->HasAttr(QN_PROTOCOL) ||
!elem->HasAttr(QN_GENERATION)) {
return BadParse("candidate missing required attribute", error);
}
rtc::SocketAddress address;
if (!ParseAddress(elem, QN_ADDRESS, QN_PORT, &address, error))
return false;
std::string channel_name = elem->Attr(buzz::QN_NAME);
int component = 0;
if (!translator ||
!translator->GetComponentFromChannelName(channel_name, &component)) {
return BadParse("candidate has unknown channel name " + channel_name,
error);
}
float preference = 0.0;
if (!GetXmlAttr(elem, QN_PREFERENCE, 0.0f, &preference)) {
return BadParse("candidate has unknown preference", error);
}
candidate->set_component(component);
candidate->set_address(address);
candidate->set_username(elem->Attr(QN_USERNAME));
candidate->set_preference(preference);
candidate->set_protocol(elem->Attr(QN_PROTOCOL));
candidate->set_generation_str(elem->Attr(QN_GENERATION));
if (elem->HasAttr(QN_PASSWORD))
candidate->set_password(elem->Attr(QN_PASSWORD));
if (elem->HasAttr(buzz::QN_TYPE))
candidate->set_type(elem->Attr(buzz::QN_TYPE));
if (elem->HasAttr(QN_NETWORK))
candidate->set_network_name(elem->Attr(QN_NETWORK));
if (!VerifyUsernameFormat(proto, candidate->username(), error))
return false;
return true;
}
bool P2PTransportParser::WriteCandidate(TransportProtocol proto,
const Candidate& candidate,
const CandidateTranslator* translator,
buzz::XmlElement* elem,
WriteError* error) {
ASSERT(proto == ICEPROTO_GOOGLE);
ASSERT(translator != NULL);
std::string channel_name;
if (!translator ||
!translator->GetChannelNameFromComponent(
candidate.component(), &channel_name)) {
return BadWrite("Cannot write candidate because of unknown component.",
error);
}
elem->SetAttr(buzz::QN_NAME, channel_name);
elem->SetAttr(QN_ADDRESS, candidate.address().ipaddr().ToString());
elem->SetAttr(QN_PORT, candidate.address().PortAsString());
AddXmlAttr(elem, QN_PREFERENCE, candidate.preference());
elem->SetAttr(QN_USERNAME, candidate.username());
elem->SetAttr(QN_PROTOCOL, candidate.protocol());
elem->SetAttr(QN_GENERATION, candidate.generation_str());
if (!candidate.password().empty())
elem->SetAttr(QN_PASSWORD, candidate.password());
elem->SetAttr(buzz::QN_TYPE, candidate.type());
if (!candidate.network_name().empty())
elem->SetAttr(QN_NETWORK, candidate.network_name());
return true;
}
} // namespace cricket
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