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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.
*/
#include "talk/p2p/base/p2ptransport.h"
#include "talk/base/common.h"
#include "talk/p2p/base/candidate.h"
#include "talk/p2p/base/constants.h"
#include "talk/base/helpers.h"
#include "talk/p2p/base/p2ptransportchannel.h"
#include "talk/p2p/base/sessionmanager.h"
#include "talk/xmllite/qname.h"
#include "talk/xmllite/xmlelement.h"
#include "talk/xmpp/constants.h"
namespace {
// We only allow usernames to be this many characters or fewer.
const size_t kMaxUsernameSize = 16;
} // namespace
namespace cricket {
const std::string kNsP2pTransport("http://www.google.com/transport/p2p");
const buzz::QName kQnP2pTransport(true, kNsP2pTransport, "transport");
const buzz::QName kQnP2pCandidate(true, kNsP2pTransport, "candidate");
const buzz::QName kQnP2pUnknownChannelName(true, kNsP2pTransport,
"unknown-channel-name");
P2PTransport::P2PTransport(SessionManager* session_manager)
: Transport(session_manager, kNsP2pTransport) {
}
P2PTransport::~P2PTransport() {
DestroyAllChannels();
}
buzz::XmlElement* P2PTransport::CreateTransportOffer() {
return new buzz::XmlElement(kQnP2pTransport, true);
}
buzz::XmlElement* P2PTransport::CreateTransportAnswer() {
return new buzz::XmlElement(kQnP2pTransport, true);
}
bool P2PTransport::OnTransportOffer(const buzz::XmlElement* elem) {
ASSERT(elem->Name() == kQnP2pTransport);
// We don't support any options, so we ignore them.
return true;
}
bool P2PTransport::OnTransportAnswer(const buzz::XmlElement* elem) {
ASSERT(elem->Name() == kQnP2pTransport);
// We don't support any options. We fail if any are given. The other side
// should know from our request that we expected an empty response.
return elem->FirstChild() == NULL;
}
bool P2PTransport::OnTransportMessage(const buzz::XmlElement* msg,
const buzz::XmlElement* stanza) {
ASSERT(msg->Name() == kQnP2pTransport);
for (const buzz::XmlElement* elem = msg->FirstElement();
elem != NULL;
elem = elem->NextElement()) {
if (elem->Name() == kQnP2pCandidate) {
// Make sure this candidate is valid.
Candidate candidate;
if (!ParseCandidate(stanza, elem, &candidate))
return false;
ForwardChannelMessage(elem->Attr(buzz::QN_NAME),
new buzz::XmlElement(*elem));
}
}
return true;
}
bool P2PTransport::OnTransportError(const buzz::XmlElement* session_msg,
const buzz::XmlElement* error) {
ASSERT(error->Name().Namespace() == kNsP2pTransport);
if ((error->Name() == kQnP2pUnknownChannelName)
&& error->HasAttr(buzz::QN_NAME)) {
std::string channel_name = error->Attr(buzz::QN_NAME);
if (HasChannel(channel_name)) {
SignalChannelGone(this, channel_name);
}
}
return true;
}
void P2PTransport::OnTransportChannelMessages(
const std::vector<buzz::XmlElement*>& candidates) {
buzz::XmlElement* transport =
new buzz::XmlElement(kQnP2pTransport, true);
for (size_t i = 0; i < candidates.size(); ++i)
transport->AddElement(candidates[i]);
std::vector<buzz::XmlElement*> elems;
elems.push_back(transport);
SignalTransportMessage(this, elems);
}
bool P2PTransport::ParseCandidate(const buzz::XmlElement* stanza,
const buzz::XmlElement* elem,
Candidate* candidate) {
// Check for all of the required attributes.
if (!elem->HasAttr(buzz::QN_NAME) ||
!elem->HasAttr(QN_ADDRESS) ||
!elem->HasAttr(QN_PORT) ||
!elem->HasAttr(QN_USERNAME) ||
!elem->HasAttr(QN_PREFERENCE) ||
!elem->HasAttr(QN_PROTOCOL) ||
!elem->HasAttr(QN_GENERATION)) {
return BadRequest(stanza, "candidate missing required attribute", NULL);
}
// Make sure the channel named actually exists.
if (!HasChannel(elem->Attr(buzz::QN_NAME))) {
scoped_ptr<buzz::XmlElement>
extra_info(new buzz::XmlElement(kQnP2pUnknownChannelName));
extra_info->AddAttr(buzz::QN_NAME, elem->Attr(buzz::QN_NAME));
return BadRequest(stanza, "channel named in candidate does not exist",
extra_info.get());
}
// Parse the address given.
talk_base::SocketAddress address;
if (!ParseAddress(stanza, elem, &address))
return false;
candidate->set_name(elem->Attr(buzz::QN_NAME));
candidate->set_address(address);
candidate->set_username(elem->Attr(QN_USERNAME));
candidate->set_preference_str(elem->Attr(QN_PREFERENCE));
candidate->set_protocol(elem->Attr(QN_PROTOCOL));
candidate->set_generation_str(elem->Attr(QN_GENERATION));
// Check that the username is not too long and does not use any bad chars.
if (candidate->username().size() > kMaxUsernameSize)
return BadRequest(stanza, "candidate username is too long", NULL);
if (!IsBase64Encoded(candidate->username()))
return BadRequest(stanza,
"candidate username has non-base64 encoded characters",
NULL);
// Look for the non-required attributes.
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));
return true;
}
buzz::XmlElement* P2PTransport::TranslateCandidate(const Candidate& c) {
buzz::XmlElement* candidate = new buzz::XmlElement(kQnP2pCandidate);
candidate->SetAttr(buzz::QN_NAME, c.name());
candidate->SetAttr(QN_ADDRESS, c.address().IPAsString());
candidate->SetAttr(QN_PORT, c.address().PortAsString());
candidate->SetAttr(QN_PREFERENCE, c.preference_str());
candidate->SetAttr(QN_USERNAME, c.username());
candidate->SetAttr(QN_PROTOCOL, c.protocol());
candidate->SetAttr(QN_GENERATION, c.generation_str());
if (c.password().size() > 0)
candidate->SetAttr(QN_PASSWORD, c.password());
if (c.type().size() > 0)
candidate->SetAttr(buzz::QN_TYPE, c.type());
if (c.network_name().size() > 0)
candidate->SetAttr(QN_NETWORK, c.network_name());
return candidate;
}
TransportChannelImpl* P2PTransport::CreateTransportChannel(
const std::string& name, const std::string &session_type) {
return new P2PTransportChannel(
name, session_type, this, session_manager()->port_allocator());
}
void P2PTransport::DestroyTransportChannel(TransportChannelImpl* channel) {
delete channel;
}
} // namespace cricket
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