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/*
* Copyright (C) 2015 Ericsson AB. All rights reserved.
* Copyright (C) 2016-2017 Apple Inc. All rights reserved.
*
* 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. Neither the name of Ericsson nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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 "config.h"
#include "PeerConnectionBackend.h"
#if ENABLE(WEB_RTC)
#include "EventNames.h"
#include "JSDOMPromiseDeferred.h"
#include "JSRTCSessionDescription.h"
#include "LibWebRTCCertificateGenerator.h"
#include "Logging.h"
#include "Page.h"
#include "RTCIceCandidate.h"
#include "RTCPeerConnection.h"
#include "RTCPeerConnectionIceEvent.h"
#include "RTCRtpCapabilities.h"
#include "RTCTrackEvent.h"
#include "RuntimeEnabledFeatures.h"
#include <wtf/UUID.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringConcatenateNumbers.h>
namespace WebCore {
using namespace PAL;
#if !USE(LIBWEBRTC)
static std::unique_ptr<PeerConnectionBackend> createNoPeerConnectionBackend(RTCPeerConnection&)
{
return nullptr;
}
CreatePeerConnectionBackend PeerConnectionBackend::create = createNoPeerConnectionBackend;
Optional<RTCRtpCapabilities> PeerConnectionBackend::receiverCapabilities(ScriptExecutionContext&, const String&)
{
ASSERT_NOT_REACHED();
return { };
}
Optional<RTCRtpCapabilities> PeerConnectionBackend::senderCapabilities(ScriptExecutionContext&, const String&)
{
ASSERT_NOT_REACHED();
return { };
}
#endif
PeerConnectionBackend::PeerConnectionBackend(RTCPeerConnection& peerConnection)
: m_peerConnection(peerConnection)
#if !RELEASE_LOG_DISABLED
, m_logger(peerConnection.logger())
, m_logIdentifier(peerConnection.logIdentifier())
#endif
{
}
PeerConnectionBackend::~PeerConnectionBackend() = default;
void PeerConnectionBackend::createOffer(RTCOfferOptions&& options, PeerConnection::SessionDescriptionPromise&& promise)
{
ASSERT(!m_offerAnswerPromise);
ASSERT(!m_peerConnection.isClosed());
m_offerAnswerPromise = WTF::makeUnique<PeerConnection::SessionDescriptionPromise>(WTFMove(promise));
doCreateOffer(WTFMove(options));
}
void PeerConnectionBackend::createOfferSucceeded(String&& sdp)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Create offer succeeded:\n", sdp);
ASSERT(m_offerAnswerPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_offerAnswerPromise), sdp = filterSDP(WTFMove(sdp))]() mutable {
if (m_peerConnection.isClosed())
return;
promise->resolve(RTCSessionDescription::Init { RTCSdpType::Offer, sdp });
});
}
void PeerConnectionBackend::createOfferFailed(Exception&& exception)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Create offer failed:", exception.message());
ASSERT(m_offerAnswerPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_offerAnswerPromise), exception = WTFMove(exception)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->reject(WTFMove(exception));
});
}
void PeerConnectionBackend::createAnswer(RTCAnswerOptions&& options, PeerConnection::SessionDescriptionPromise&& promise)
{
ASSERT(!m_offerAnswerPromise);
ASSERT(!m_peerConnection.isClosed());
m_offerAnswerPromise = WTF::makeUnique<PeerConnection::SessionDescriptionPromise>(WTFMove(promise));
doCreateAnswer(WTFMove(options));
}
void PeerConnectionBackend::createAnswerSucceeded(String&& sdp)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Create answer succeeded:\n", sdp);
ASSERT(m_offerAnswerPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_offerAnswerPromise), sdp = WTFMove(sdp)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->resolve(RTCSessionDescription::Init { RTCSdpType::Answer, sdp });
});
}
void PeerConnectionBackend::createAnswerFailed(Exception&& exception)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Create answer failed:", exception.message());
ASSERT(m_offerAnswerPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_offerAnswerPromise), exception = WTFMove(exception)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->reject(WTFMove(exception));
});
}
static inline bool isLocalDescriptionTypeValidForState(RTCSdpType type, RTCSignalingState state)
{
switch (state) {
case RTCSignalingState::Stable:
return type == RTCSdpType::Offer;
case RTCSignalingState::HaveLocalOffer:
return type == RTCSdpType::Offer;
case RTCSignalingState::HaveRemoteOffer:
return type == RTCSdpType::Answer || type == RTCSdpType::Pranswer;
case RTCSignalingState::HaveLocalPranswer:
return type == RTCSdpType::Answer || type == RTCSdpType::Pranswer;
default:
return false;
};
ASSERT_NOT_REACHED();
return false;
}
void PeerConnectionBackend::setLocalDescription(RTCSessionDescription& sessionDescription, DOMPromiseDeferred<void>&& promise)
{
ASSERT(!m_peerConnection.isClosed());
if (!isLocalDescriptionTypeValidForState(sessionDescription.type(), m_peerConnection.signalingState())) {
promise.reject(InvalidStateError, "Description type incompatible with current signaling state");
return;
}
m_setDescriptionPromise = WTF::makeUnique<DOMPromiseDeferred<void>>(WTFMove(promise));
doSetLocalDescription(sessionDescription);
}
void PeerConnectionBackend::setLocalDescriptionSucceeded()
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER);
ASSERT(m_setDescriptionPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_setDescriptionPromise)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->resolve();
});
}
void PeerConnectionBackend::setLocalDescriptionFailed(Exception&& exception)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Set local description failed:", exception.message());
ASSERT(m_setDescriptionPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_setDescriptionPromise), exception = WTFMove(exception)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->reject(WTFMove(exception));
});
}
static inline bool isRemoteDescriptionTypeValidForState(RTCSdpType type, RTCSignalingState state)
{
switch (state) {
case RTCSignalingState::Stable:
return type == RTCSdpType::Offer;
case RTCSignalingState::HaveLocalOffer:
return type == RTCSdpType::Answer || type == RTCSdpType::Pranswer;
case RTCSignalingState::HaveRemoteOffer:
return type == RTCSdpType::Offer;
case RTCSignalingState::HaveRemotePranswer:
return type == RTCSdpType::Answer || type == RTCSdpType::Pranswer;
default:
return false;
};
ASSERT_NOT_REACHED();
return false;
}
void PeerConnectionBackend::setRemoteDescription(RTCSessionDescription& sessionDescription, DOMPromiseDeferred<void>&& promise)
{
ASSERT(!m_peerConnection.isClosed());
if (!isRemoteDescriptionTypeValidForState(sessionDescription.type(), m_peerConnection.signalingState())) {
promise.reject(InvalidStateError, "Description type incompatible with current signaling state");
return;
}
m_setDescriptionPromise = WTF::makeUnique<DOMPromiseDeferred<void>>(WTFMove(promise));
doSetRemoteDescription(sessionDescription);
}
void PeerConnectionBackend::setRemoteDescriptionSucceeded()
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Set remote description succeeded");
ASSERT(m_setDescriptionPromise);
auto promise = WTFMove(m_setDescriptionPromise);
auto events = WTFMove(m_pendingTrackEvents);
for (auto& event : events) {
auto& track = event.track.get();
m_peerConnection.dispatchEventWhenFeasible(RTCTrackEvent::create(eventNames().trackEvent, Event::CanBubble::No, Event::IsCancelable::No, WTFMove(event.receiver), WTFMove(event.track), WTFMove(event.streams), WTFMove(event.transceiver)));
if (m_peerConnection.isClosed())
return;
// FIXME: As per spec, we should set muted to 'false' when starting to receive the content from network.
track.source().setMuted(false);
}
m_peerConnection.doTask([this, promise = WTFMove(promise)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->resolve();
});
}
void PeerConnectionBackend::setRemoteDescriptionFailed(Exception&& exception)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Set remote description failed:", exception.message());
ASSERT(m_pendingTrackEvents.isEmpty());
m_pendingTrackEvents.clear();
ASSERT(m_setDescriptionPromise);
m_peerConnection.doTask([this, promise = WTFMove(m_setDescriptionPromise), exception = WTFMove(exception)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->reject(WTFMove(exception));
});
}
void PeerConnectionBackend::addPendingTrackEvent(PendingTrackEvent&& event)
{
ASSERT(!m_peerConnection.isClosed());
m_pendingTrackEvents.append(WTFMove(event));
}
static String extractIPAddress(StringView sdp)
{
unsigned counter = 0;
for (auto item : StringView { sdp }.split(' ')) {
if (++counter == 5)
return item.toString();
}
return { };
}
static inline bool shouldIgnoreIceCandidate(const RTCIceCandidate& iceCandidate)
{
auto address = extractIPAddress(iceCandidate.candidate());
if (!address.endsWithIgnoringASCIICase(".local"_s))
return false;
if (!WTF::isVersion4UUID(StringView { address }.substring(0, address.length() - 6))) {
RELEASE_LOG_ERROR(WebRTC, "mDNS candidate is not a Version 4 UUID");
return true;
}
return false;
}
void PeerConnectionBackend::addIceCandidate(RTCIceCandidate* iceCandidate, DOMPromiseDeferred<void>&& promise)
{
ASSERT(!m_peerConnection.isClosed());
if (!iceCandidate) {
endOfIceCandidates(WTFMove(promise));
return;
}
// FIXME: As per https://w3c.github.io/webrtc-pc/#dom-rtcpeerconnection-addicecandidate(), this check should be done before enqueuing the task.
if (iceCandidate->sdpMid().isNull() && !iceCandidate->sdpMLineIndex()) {
promise.reject(Exception { TypeError, "Trying to add a candidate that is missing both sdpMid and sdpMLineIndex"_s });
return;
}
if (shouldIgnoreIceCandidate(*iceCandidate)) {
promise.resolve();
return;
}
m_addIceCandidatePromise = WTF::makeUnique<DOMPromiseDeferred<void>>(WTFMove(promise));
doAddIceCandidate(*iceCandidate);
}
void PeerConnectionBackend::addIceCandidateSucceeded()
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Adding ice candidate succeeded");
ASSERT(m_addIceCandidatePromise);
m_peerConnection.doTask([this, promise = WTFMove(m_addIceCandidatePromise)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->resolve();
});
}
void PeerConnectionBackend::addIceCandidateFailed(Exception&& exception)
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Adding ice candidate failed:", exception.message());
ASSERT(m_addIceCandidatePromise);
m_peerConnection.doTask([this, promise = WTFMove(m_addIceCandidatePromise), exception = WTFMove(exception)]() mutable {
if (m_peerConnection.isClosed())
return;
promise->reject(WTFMove(exception));
});
}
void PeerConnectionBackend::fireICECandidateEvent(RefPtr<RTCIceCandidate>&& candidate, String&& serverURL)
{
ASSERT(isMainThread());
m_peerConnection.dispatchEventWhenFeasible(RTCPeerConnectionIceEvent::create(Event::CanBubble::No, Event::IsCancelable::No, WTFMove(candidate), WTFMove(serverURL)));
}
void PeerConnectionBackend::enableICECandidateFiltering()
{
m_shouldFilterICECandidates = true;
}
void PeerConnectionBackend::disableICECandidateFiltering()
{
m_shouldFilterICECandidates = false;
for (auto& pendingICECandidate : m_pendingICECandidates)
fireICECandidateEvent(RTCIceCandidate::create(WTFMove(pendingICECandidate.sdp), WTFMove(pendingICECandidate.mid), pendingICECandidate.sdpMLineIndex), WTFMove(pendingICECandidate.serverURL));
m_pendingICECandidates.clear();
}
static String filterICECandidate(String&& sdp)
{
ASSERT(!sdp.contains(" host "));
if (!sdp.contains(" raddr "))
return WTFMove(sdp);
bool skipNextItem = false;
bool isFirst = true;
StringBuilder filteredSDP;
sdp.split(' ', [&](StringView item) {
if (skipNextItem) {
skipNextItem = false;
return;
}
if (item == "raddr") {
filteredSDP.append(" raddr 0.0.0.0");
skipNextItem = true;
return;
}
if (item == "rport") {
filteredSDP.append(" rport 0");
skipNextItem = true;
return;
}
if (isFirst)
isFirst = false;
else
filteredSDP.append(' ');
filteredSDP.append(item);
});
return filteredSDP.toString();
}
String PeerConnectionBackend::filterSDP(String&& sdp) const
{
if (!m_shouldFilterICECandidates)
return WTFMove(sdp);
StringBuilder filteredSDP;
sdp.split('\n', [this, &filteredSDP](StringView line) {
if (line.startsWith("c=IN IP4"))
filteredSDP.append("c=IN IP4 0.0.0.0\r");
else if (line.startsWith("c=IN IP6"))
filteredSDP.append("c=IN IP6 ::\r");
else if (!line.startsWith("a=candidate"))
filteredSDP.append(line);
else if (line.find(" host ", 11) == notFound)
filteredSDP.append(filterICECandidate(line.toString()));
else {
auto ipAddress = extractIPAddress(line);
auto mdnsName = m_ipAddressToMDNSNameMap.get(ipAddress);
if (!mdnsName.isEmpty()) {
auto sdp = line.toString();
sdp.replace(ipAddress, mdnsName);
filteredSDP.append(sdp);
}
}
filteredSDP.append('\n');
});
return filteredSDP.toString();
}
void PeerConnectionBackend::newICECandidate(String&& sdp, String&& mid, unsigned short sdpMLineIndex, String&& serverURL)
{
m_peerConnection.doTask([logSiteIdentifier = LOGIDENTIFIER, this, sdp = WTFMove(sdp), mid = WTFMove(mid), sdpMLineIndex, serverURL = WTFMove(serverURL)]() mutable {
UNUSED_PARAM(logSiteIdentifier);
ALWAYS_LOG(logSiteIdentifier, "Gathered ice candidate:", sdp);
m_finishedGatheringCandidates = false;
if (!m_shouldFilterICECandidates) {
fireICECandidateEvent(RTCIceCandidate::create(WTFMove(sdp), WTFMove(mid), sdpMLineIndex), WTFMove(serverURL));
return;
}
if (sdp.find(" host ", 0) != notFound) {
// FIXME: We might need to clear all pending candidates when setting again local description.
m_pendingICECandidates.append(PendingICECandidate { String { sdp }, WTFMove(mid), sdpMLineIndex, WTFMove(serverURL) });
if (RuntimeEnabledFeatures::sharedFeatures().webRTCMDNSICECandidatesEnabled()) {
auto ipAddress = extractIPAddress(sdp);
// We restrict to IPv4 candidates for now.
if (ipAddress.contains('.'))
registerMDNSName(ipAddress);
}
return;
}
fireICECandidateEvent(RTCIceCandidate::create(filterICECandidate(WTFMove(sdp)), WTFMove(mid), sdpMLineIndex), WTFMove(serverURL));
});
}
void PeerConnectionBackend::doneGatheringCandidates()
{
ASSERT(isMainThread());
ALWAYS_LOG(LOGIDENTIFIER, "Finished ice candidate gathering");
m_finishedGatheringCandidates = true;
if (m_waitingForMDNSRegistration)
return;
m_peerConnection.dispatchEventWhenFeasible(RTCPeerConnectionIceEvent::create(Event::CanBubble::No, Event::IsCancelable::No, nullptr, { }));
m_peerConnection.updateIceGatheringState(RTCIceGatheringState::Complete);
m_pendingICECandidates.clear();
}
void PeerConnectionBackend::endOfIceCandidates(DOMPromiseDeferred<void>&& promise)
{
promise.resolve();
}
void PeerConnectionBackend::registerMDNSName(const String& ipAddress)
{
++m_waitingForMDNSRegistration;
auto& document = downcast<Document>(*m_peerConnection.scriptExecutionContext());
auto& provider = document.page()->libWebRTCProvider();
provider.registerMDNSName(document.identifier(), ipAddress, [peerConnection = makeRef(m_peerConnection), this, ipAddress] (LibWebRTCProvider::MDNSNameOrError&& result) {
if (peerConnection->isStopped())
return;
--m_waitingForMDNSRegistration;
if (!result.has_value()) {
m_peerConnection.scriptExecutionContext()->addConsoleMessage(MessageSource::JS, MessageLevel::Warning, makeString("MDNS registration of a host candidate failed with error ", (unsigned)result.error()));
return;
}
this->finishedRegisteringMDNSName(ipAddress, result.value());
});
}
void PeerConnectionBackend::finishedRegisteringMDNSName(const String& ipAddress, const String& name)
{
m_ipAddressToMDNSNameMap.add(ipAddress, name);
Vector<PendingICECandidate*> candidates;
for (auto& candidate : m_pendingICECandidates) {
if (candidate.sdp.find(ipAddress) != notFound) {
auto sdp = candidate.sdp;
sdp.replace(ipAddress, name);
fireICECandidateEvent(RTCIceCandidate::create(WTFMove(sdp), WTFMove(candidate.mid), candidate.sdpMLineIndex), WTFMove(candidate.serverURL));
candidates.append(&candidate);
}
}
m_pendingICECandidates.removeAllMatching([&] (const auto& candidate) {
return candidates.contains(&candidate);
});
if (!m_waitingForMDNSRegistration && m_finishedGatheringCandidates)
doneGatheringCandidates();
}
void PeerConnectionBackend::updateSignalingState(RTCSignalingState newSignalingState)
{
ASSERT(isMainThread());
if (newSignalingState != m_peerConnection.signalingState()) {
m_peerConnection.setSignalingState(newSignalingState);
m_peerConnection.dispatchEventWhenFeasible(Event::create(eventNames().signalingstatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
}
}
void PeerConnectionBackend::stop()
{
m_offerAnswerPromise = nullptr;
m_setDescriptionPromise = nullptr;
m_addIceCandidatePromise = nullptr;
m_pendingTrackEvents.clear();
doStop();
}
void PeerConnectionBackend::markAsNeedingNegotiation()
{
if (m_negotiationNeeded)
return;
m_negotiationNeeded = true;
if (m_peerConnection.signalingState() == RTCSignalingState::Stable)
m_peerConnection.scheduleNegotiationNeededEvent();
}
ExceptionOr<Ref<RTCRtpSender>> PeerConnectionBackend::addTrack(MediaStreamTrack&, Vector<String>&&)
{
return Exception { NotSupportedError, "Not implemented"_s };
}
ExceptionOr<Ref<RTCRtpTransceiver>> PeerConnectionBackend::addTransceiver(const String&, const RTCRtpTransceiverInit&)
{
return Exception { NotSupportedError, "Not implemented"_s };
}
ExceptionOr<Ref<RTCRtpTransceiver>> PeerConnectionBackend::addTransceiver(Ref<MediaStreamTrack>&&, const RTCRtpTransceiverInit&)
{
return Exception { NotSupportedError, "Not implemented"_s };
}
void PeerConnectionBackend::generateCertificate(Document& document, const CertificateInformation& info, DOMPromiseDeferred<IDLInterface<RTCCertificate>>&& promise)
{
#if USE(LIBWEBRTC)
LibWebRTCCertificateGenerator::generateCertificate(document.securityOrigin(), document.page()->libWebRTCProvider(), info, WTFMove(promise));
#else
UNUSED_PARAM(document);
UNUSED_PARAM(expires);
UNUSED_PARAM(type);
promise.reject(NotSupportedError);
#endif
}
ScriptExecutionContext* PeerConnectionBackend::context() const
{
return m_peerConnection.scriptExecutionContext();
}
RTCRtpTransceiver* PeerConnectionBackend::transceiverFromSender(const RTCRtpSender& sender)
{
for (auto& transceiver : m_peerConnection.currentTransceivers()) {
if (&transceiver->sender() == &sender)
return transceiver.get();
}
return nullptr;
}
#if !RELEASE_LOG_DISABLED
WTFLogChannel& PeerConnectionBackend::logChannel() const
{
return LogWebRTC;
}
#endif
} // namespace WebCore
#endif // ENABLE(WEB_RTC)