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jsep_transport_controller.cc
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/*
* Copyright 2017 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 "pc/jsep_transport_controller.h"
#include <memory>
#include <utility>
#include "absl/algorithm/container.h"
#include "api/ice_transport_factory.h"
#include "api/transport/datagram_transport_interface.h"
#include "api/transport/media/media_transport_interface.h"
#include "p2p/base/ice_transport_internal.h"
#include "p2p/base/port.h"
#include "pc/datagram_rtp_transport.h"
#include "pc/srtp_filter.h"
#include "rtc_base/bind.h"
#include "rtc_base/checks.h"
#include "rtc_base/thread.h"
using webrtc::SdpType;
namespace {
webrtc::RTCError VerifyCandidate(const cricket::Candidate& cand) {
// No address zero.
if (cand.address().IsNil() || cand.address().IsAnyIP()) {
return webrtc::RTCError(webrtc::RTCErrorType::INVALID_PARAMETER,
"candidate has address of zero");
}
// Disallow all ports below 1024, except for 80 and 443 on public addresses.
int port = cand.address().port();
if (cand.protocol() == cricket::TCP_PROTOCOL_NAME &&
(cand.tcptype() == cricket::TCPTYPE_ACTIVE_STR || port == 0)) {
// Expected for active-only candidates per
// http://tools.ietf.org/html/rfc6544#section-4.5 so no error.
// Libjingle clients emit port 0, in "active" mode.
return webrtc::RTCError::OK();
}
if (port < 1024) {
if ((port != 80) && (port != 443)) {
return webrtc::RTCError(
webrtc::RTCErrorType::INVALID_PARAMETER,
"candidate has port below 1024, but not 80 or 443");
}
if (cand.address().IsPrivateIP()) {
return webrtc::RTCError(
webrtc::RTCErrorType::INVALID_PARAMETER,
"candidate has port of 80 or 443 with private IP address");
}
}
// Disallow ICE-TCP with a private IP address.
if (cand.protocol() == cricket::TCP_PROTOCOL_NAME &&
cand.address().IsPrivateIP()) {
return webrtc::RTCError(webrtc::RTCErrorType::INVALID_PARAMETER,
"candidate is TCP and has a private IP address");
}
return webrtc::RTCError::OK();
}
webrtc::RTCError VerifyCandidates(const cricket::Candidates& candidates) {
for (const cricket::Candidate& candidate : candidates) {
webrtc::RTCError error = VerifyCandidate(candidate);
if (!error.ok()) {
return error;
}
}
return webrtc::RTCError::OK();
}
} // namespace
namespace webrtc {
JsepTransportController::JsepTransportController(
rtc::Thread* signaling_thread,
rtc::Thread* network_thread,
cricket::PortAllocator* port_allocator,
AsyncResolverFactory* async_resolver_factory,
Config config)
: signaling_thread_(signaling_thread),
network_thread_(network_thread),
port_allocator_(port_allocator),
async_resolver_factory_(async_resolver_factory),
config_(config) {
// The |transport_observer| is assumed to be non-null.
RTC_DCHECK(config_.transport_observer);
RTC_DCHECK(config_.rtcp_handler);
RTC_DCHECK(config_.ice_transport_factory);
}
JsepTransportController::~JsepTransportController() {
// Channel destructors may try to send packets, so this needs to happen on
// the network thread.
network_thread_->Invoke<void>(
RTC_FROM_HERE,
rtc::Bind(&JsepTransportController::DestroyAllJsepTransports_n, this));
}
RTCError JsepTransportController::SetLocalDescription(
SdpType type,
const cricket::SessionDescription* description) {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<RTCError>(
RTC_FROM_HERE, [=] { return SetLocalDescription(type, description); });
}
if (!initial_offerer_.has_value()) {
initial_offerer_.emplace(type == SdpType::kOffer);
if (*initial_offerer_) {
SetIceRole_n(cricket::ICEROLE_CONTROLLING);
} else {
SetIceRole_n(cricket::ICEROLE_CONTROLLED);
}
}
return ApplyDescription_n(/*local=*/true, type, description);
}
RTCError JsepTransportController::SetRemoteDescription(
SdpType type,
const cricket::SessionDescription* description) {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<RTCError>(
RTC_FROM_HERE, [=] { return SetRemoteDescription(type, description); });
}
return ApplyDescription_n(/*local=*/false, type, description);
}
RtpTransportInternal* JsepTransportController::GetRtpTransport(
const std::string& mid) const {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return nullptr;
}
return jsep_transport->rtp_transport();
}
MediaTransportConfig JsepTransportController::GetMediaTransportConfig(
const std::string& mid) const {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return MediaTransportConfig();
}
DatagramTransportInterface* datagram_transport = nullptr;
if (config_.use_datagram_transport) {
datagram_transport = jsep_transport->datagram_transport();
}
if (datagram_transport) {
return MediaTransportConfig(
/*rtp_max_packet_size=*/datagram_transport->GetLargestDatagramSize());
} else {
return MediaTransportConfig();
}
}
DataChannelTransportInterface* JsepTransportController::GetDataChannelTransport(
const std::string& mid) const {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return nullptr;
}
return jsep_transport->data_channel_transport();
}
cricket::DtlsTransportInternal* JsepTransportController::GetDtlsTransport(
const std::string& mid) {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return nullptr;
}
return jsep_transport->rtp_dtls_transport();
}
const cricket::DtlsTransportInternal*
JsepTransportController::GetRtcpDtlsTransport(const std::string& mid) const {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return nullptr;
}
return jsep_transport->rtcp_dtls_transport();
}
rtc::scoped_refptr<webrtc::DtlsTransport>
JsepTransportController::LookupDtlsTransportByMid(const std::string& mid) {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return nullptr;
}
return jsep_transport->RtpDtlsTransport();
}
rtc::scoped_refptr<SctpTransport> JsepTransportController::GetSctpTransport(
const std::string& mid) const {
auto jsep_transport = GetJsepTransportForMid(mid);
if (!jsep_transport) {
return nullptr;
}
return jsep_transport->SctpTransport();
}
void JsepTransportController::SetIceConfig(const cricket::IceConfig& config) {
if (!network_thread_->IsCurrent()) {
network_thread_->Invoke<void>(RTC_FROM_HERE, [&] { SetIceConfig(config); });
return;
}
ice_config_ = config;
for (auto& dtls : GetDtlsTransports()) {
dtls->ice_transport()->SetIceConfig(ice_config_);
}
}
void JsepTransportController::SetNeedsIceRestartFlag() {
for (auto& kv : jsep_transports_by_name_) {
kv.second->SetNeedsIceRestartFlag();
}
}
bool JsepTransportController::NeedsIceRestart(
const std::string& transport_name) const {
const cricket::JsepTransport* transport =
GetJsepTransportByName(transport_name);
if (!transport) {
return false;
}
return transport->needs_ice_restart();
}
absl::optional<rtc::SSLRole> JsepTransportController::GetDtlsRole(
const std::string& mid) const {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<absl::optional<rtc::SSLRole>>(
RTC_FROM_HERE, [&] { return GetDtlsRole(mid); });
}
const cricket::JsepTransport* t = GetJsepTransportForMid(mid);
if (!t) {
return absl::optional<rtc::SSLRole>();
}
return t->GetDtlsRole();
}
bool JsepTransportController::SetLocalCertificate(
const rtc::scoped_refptr<rtc::RTCCertificate>& certificate) {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<bool>(
RTC_FROM_HERE, [&] { return SetLocalCertificate(certificate); });
}
// Can't change a certificate, or set a null certificate.
if (certificate_ || !certificate) {
return false;
}
certificate_ = certificate;
// Set certificate for JsepTransport, which verifies it matches the
// fingerprint in SDP, and DTLS transport.
// Fallback from DTLS to SDES is not supported.
for (auto& kv : jsep_transports_by_name_) {
kv.second->SetLocalCertificate(certificate_);
}
for (auto& dtls : GetDtlsTransports()) {
bool set_cert_success = dtls->SetLocalCertificate(certificate_);
RTC_DCHECK(set_cert_success);
}
return true;
}
rtc::scoped_refptr<rtc::RTCCertificate>
JsepTransportController::GetLocalCertificate(
const std::string& transport_name) const {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<rtc::scoped_refptr<rtc::RTCCertificate>>(
RTC_FROM_HERE, [&] { return GetLocalCertificate(transport_name); });
}
const cricket::JsepTransport* t = GetJsepTransportByName(transport_name);
if (!t) {
return nullptr;
}
return t->GetLocalCertificate();
}
std::unique_ptr<rtc::SSLCertChain>
JsepTransportController::GetRemoteSSLCertChain(
const std::string& transport_name) const {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<std::unique_ptr<rtc::SSLCertChain>>(
RTC_FROM_HERE, [&] { return GetRemoteSSLCertChain(transport_name); });
}
// Get the certificate from the RTP transport's DTLS handshake. Should be
// identical to the RTCP transport's, since they were given the same remote
// fingerprint.
auto jsep_transport = GetJsepTransportByName(transport_name);
if (!jsep_transport) {
return nullptr;
}
auto dtls = jsep_transport->rtp_dtls_transport();
if (!dtls) {
return nullptr;
}
return dtls->GetRemoteSSLCertChain();
}
void JsepTransportController::MaybeStartGathering() {
if (!network_thread_->IsCurrent()) {
network_thread_->Invoke<void>(RTC_FROM_HERE,
[&] { MaybeStartGathering(); });
return;
}
for (auto& dtls : GetDtlsTransports()) {
dtls->ice_transport()->MaybeStartGathering();
}
}
RTCError JsepTransportController::AddRemoteCandidates(
const std::string& transport_name,
const cricket::Candidates& candidates) {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<RTCError>(RTC_FROM_HERE, [&] {
return AddRemoteCandidates(transport_name, candidates);
});
}
// Verify each candidate before passing down to the transport layer.
RTCError error = VerifyCandidates(candidates);
if (!error.ok()) {
return error;
}
auto jsep_transport = GetJsepTransportByName(transport_name);
if (!jsep_transport) {
RTC_LOG(LS_WARNING) << "Not adding candidate because the JsepTransport "
"doesn't exist. Ignore it.";
return RTCError::OK();
}
return jsep_transport->AddRemoteCandidates(candidates);
}
RTCError JsepTransportController::RemoveRemoteCandidates(
const cricket::Candidates& candidates) {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<RTCError>(
RTC_FROM_HERE, [&] { return RemoveRemoteCandidates(candidates); });
}
// Verify each candidate before passing down to the transport layer.
RTCError error = VerifyCandidates(candidates);
if (!error.ok()) {
return error;
}
std::map<std::string, cricket::Candidates> candidates_by_transport_name;
for (const cricket::Candidate& cand : candidates) {
if (!cand.transport_name().empty()) {
candidates_by_transport_name[cand.transport_name()].push_back(cand);
} else {
RTC_LOG(LS_ERROR) << "Not removing candidate because it does not have a "
"transport name set: "
<< cand.ToSensitiveString();
}
}
for (const auto& kv : candidates_by_transport_name) {
const std::string& transport_name = kv.first;
const cricket::Candidates& candidates = kv.second;
cricket::JsepTransport* jsep_transport =
GetJsepTransportByName(transport_name);
if (!jsep_transport) {
RTC_LOG(LS_WARNING)
<< "Not removing candidate because the JsepTransport doesn't exist.";
continue;
}
for (const cricket::Candidate& candidate : candidates) {
cricket::DtlsTransportInternal* dtls =
candidate.component() == cricket::ICE_CANDIDATE_COMPONENT_RTP
? jsep_transport->rtp_dtls_transport()
: jsep_transport->rtcp_dtls_transport();
if (dtls) {
dtls->ice_transport()->RemoveRemoteCandidate(candidate);
}
}
}
return RTCError::OK();
}
bool JsepTransportController::GetStats(const std::string& transport_name,
cricket::TransportStats* stats) {
if (!network_thread_->IsCurrent()) {
return network_thread_->Invoke<bool>(
RTC_FROM_HERE, [=] { return GetStats(transport_name, stats); });
}
cricket::JsepTransport* transport = GetJsepTransportByName(transport_name);
if (!transport) {
return false;
}
return transport->GetStats(stats);
}
void JsepTransportController::SetActiveResetSrtpParams(
bool active_reset_srtp_params) {
if (!network_thread_->IsCurrent()) {
network_thread_->Invoke<void>(RTC_FROM_HERE, [=] {
SetActiveResetSrtpParams(active_reset_srtp_params);
});
return;
}
RTC_LOG(INFO)
<< "Updating the active_reset_srtp_params for JsepTransportController: "
<< active_reset_srtp_params;
config_.active_reset_srtp_params = active_reset_srtp_params;
for (auto& kv : jsep_transports_by_name_) {
kv.second->SetActiveResetSrtpParams(active_reset_srtp_params);
}
}
void JsepTransportController::SetMediaTransportSettings(
bool use_datagram_transport,
bool use_datagram_transport_for_data_channels,
bool use_datagram_transport_for_data_channels_receive_only) {
config_.use_datagram_transport = use_datagram_transport;
config_.use_datagram_transport_for_data_channels =
use_datagram_transport_for_data_channels;
config_.use_datagram_transport_for_data_channels_receive_only =
use_datagram_transport_for_data_channels_receive_only;
}
void JsepTransportController::RollbackTransports() {
if (!network_thread_->IsCurrent()) {
network_thread_->Invoke<void>(RTC_FROM_HERE, [=] { RollbackTransports(); });
return;
}
RTC_DCHECK_RUN_ON(network_thread_);
for (auto&& mid : pending_mids_) {
RemoveTransportForMid(mid);
}
for (auto&& mid : pending_mids_) {
MaybeDestroyJsepTransport(mid);
}
pending_mids_.clear();
}
rtc::scoped_refptr<webrtc::IceTransportInterface>
JsepTransportController::CreateIceTransport(const std::string& transport_name,
bool rtcp) {
int component = rtcp ? cricket::ICE_CANDIDATE_COMPONENT_RTCP
: cricket::ICE_CANDIDATE_COMPONENT_RTP;
IceTransportInit init;
init.set_port_allocator(port_allocator_);
init.set_async_resolver_factory(async_resolver_factory_);
init.set_event_log(config_.event_log);
return config_.ice_transport_factory->CreateIceTransport(
transport_name, component, std::move(init));
}
std::unique_ptr<cricket::DtlsTransportInternal>
JsepTransportController::CreateDtlsTransport(
const cricket::ContentInfo& content_info,
cricket::IceTransportInternal* ice,
DatagramTransportInterface* datagram_transport) {
RTC_DCHECK(network_thread_->IsCurrent());
std::unique_ptr<cricket::DtlsTransportInternal> dtls;
if (datagram_transport) {
RTC_DCHECK(config_.use_datagram_transport ||
config_.use_datagram_transport_for_data_channels);
} else if (config_.dtls_transport_factory) {
dtls = config_.dtls_transport_factory->CreateDtlsTransport(
ice, config_.crypto_options);
} else {
dtls = std::make_unique<cricket::DtlsTransport>(ice, config_.crypto_options,
config_.event_log);
}
RTC_DCHECK(dtls);
dtls->SetSslMaxProtocolVersion(config_.ssl_max_version);
dtls->ice_transport()->SetIceRole(ice_role_);
dtls->ice_transport()->SetIceTiebreaker(ice_tiebreaker_);
dtls->ice_transport()->SetIceConfig(ice_config_);
if (certificate_) {
bool set_cert_success = dtls->SetLocalCertificate(certificate_);
RTC_DCHECK(set_cert_success);
}
// Connect to signals offered by the DTLS and ICE transport.
dtls->SignalWritableState.connect(
this, &JsepTransportController::OnTransportWritableState_n);
dtls->SignalReceivingState.connect(
this, &JsepTransportController::OnTransportReceivingState_n);
dtls->SignalDtlsHandshakeError.connect(
this, &JsepTransportController::OnDtlsHandshakeError);
dtls->ice_transport()->SignalGatheringState.connect(
this, &JsepTransportController::OnTransportGatheringState_n);
dtls->ice_transport()->SignalCandidateGathered.connect(
this, &JsepTransportController::OnTransportCandidateGathered_n);
dtls->ice_transport()->SignalCandidateError.connect(
this, &JsepTransportController::OnTransportCandidateError_n);
dtls->ice_transport()->SignalCandidatesRemoved.connect(
this, &JsepTransportController::OnTransportCandidatesRemoved_n);
dtls->ice_transport()->SignalRoleConflict.connect(
this, &JsepTransportController::OnTransportRoleConflict_n);
dtls->ice_transport()->SignalStateChanged.connect(
this, &JsepTransportController::OnTransportStateChanged_n);
dtls->ice_transport()->SignalIceTransportStateChanged.connect(
this, &JsepTransportController::OnTransportStateChanged_n);
dtls->ice_transport()->SignalCandidatePairChanged.connect(
this, &JsepTransportController::OnTransportCandidatePairChanged_n);
return dtls;
}
std::unique_ptr<webrtc::RtpTransport>
JsepTransportController::CreateUnencryptedRtpTransport(
const std::string& transport_name,
rtc::PacketTransportInternal* rtp_packet_transport,
rtc::PacketTransportInternal* rtcp_packet_transport) {
RTC_DCHECK(network_thread_->IsCurrent());
auto unencrypted_rtp_transport =
std::make_unique<RtpTransport>(rtcp_packet_transport == nullptr);
unencrypted_rtp_transport->SetRtpPacketTransport(rtp_packet_transport);
if (rtcp_packet_transport) {
unencrypted_rtp_transport->SetRtcpPacketTransport(rtcp_packet_transport);
}
return unencrypted_rtp_transport;
}
std::unique_ptr<webrtc::SrtpTransport>
JsepTransportController::CreateSdesTransport(
const std::string& transport_name,
cricket::DtlsTransportInternal* rtp_dtls_transport,
cricket::DtlsTransportInternal* rtcp_dtls_transport) {
RTC_DCHECK(network_thread_->IsCurrent());
auto srtp_transport =
std::make_unique<webrtc::SrtpTransport>(rtcp_dtls_transport == nullptr);
RTC_DCHECK(rtp_dtls_transport);
srtp_transport->SetRtpPacketTransport(rtp_dtls_transport);
if (rtcp_dtls_transport) {
srtp_transport->SetRtcpPacketTransport(rtcp_dtls_transport);
}
if (config_.enable_external_auth) {
srtp_transport->EnableExternalAuth();
}
return srtp_transport;
}
std::unique_ptr<webrtc::DtlsSrtpTransport>
JsepTransportController::CreateDtlsSrtpTransport(
const std::string& transport_name,
cricket::DtlsTransportInternal* rtp_dtls_transport,
cricket::DtlsTransportInternal* rtcp_dtls_transport) {
RTC_DCHECK(network_thread_->IsCurrent());
auto dtls_srtp_transport = std::make_unique<webrtc::DtlsSrtpTransport>(
rtcp_dtls_transport == nullptr);
if (config_.enable_external_auth) {
dtls_srtp_transport->EnableExternalAuth();
}
dtls_srtp_transport->SetDtlsTransports(rtp_dtls_transport,
rtcp_dtls_transport);
dtls_srtp_transport->SetActiveResetSrtpParams(
config_.active_reset_srtp_params);
dtls_srtp_transport->SignalDtlsStateChange.connect(
this, &JsepTransportController::UpdateAggregateStates_n);
return dtls_srtp_transport;
}
std::vector<cricket::DtlsTransportInternal*>
JsepTransportController::GetDtlsTransports() {
std::vector<cricket::DtlsTransportInternal*> dtls_transports;
for (auto it = jsep_transports_by_name_.begin();
it != jsep_transports_by_name_.end(); ++it) {
auto jsep_transport = it->second.get();
RTC_DCHECK(jsep_transport);
if (jsep_transport->rtp_dtls_transport()) {
dtls_transports.push_back(jsep_transport->rtp_dtls_transport());
}
if (jsep_transport->rtcp_dtls_transport()) {
dtls_transports.push_back(jsep_transport->rtcp_dtls_transport());
}
}
return dtls_transports;
}
RTCError JsepTransportController::ApplyDescription_n(
bool local,
SdpType type,
const cricket::SessionDescription* description) {
RTC_DCHECK_RUN_ON(network_thread_);
RTC_DCHECK(description);
if (local) {
local_desc_ = description;
} else {
remote_desc_ = description;
}
RTCError error;
error = ValidateAndMaybeUpdateBundleGroup(local, type, description);
if (!error.ok()) {
return error;
}
std::vector<int> merged_encrypted_extension_ids;
absl::optional<std::string> bundle_media_alt_protocol;
absl::optional<std::string> bundle_data_alt_protocol;
if (bundle_group_) {
merged_encrypted_extension_ids =
MergeEncryptedHeaderExtensionIdsForBundle(description);
error = GetAltProtocolsForBundle(description, &bundle_media_alt_protocol,
&bundle_data_alt_protocol);
if (!error.ok()) {
return error;
}
}
for (const cricket::ContentInfo& content_info : description->contents()) {
// Don't create transports for rejected m-lines and bundled m-lines."
if (content_info.rejected ||
(IsBundled(content_info.name) && content_info.name != *bundled_mid())) {
continue;
}
error = MaybeCreateJsepTransport(local, content_info, *description);
if (!error.ok()) {
return error;
}
}
RTC_DCHECK(description->contents().size() ==
description->transport_infos().size());
for (size_t i = 0; i < description->contents().size(); ++i) {
const cricket::ContentInfo& content_info = description->contents()[i];
const cricket::MediaContentDescription* media_description =
content_info.media_description();
const cricket::TransportInfo& transport_info =
description->transport_infos()[i];
if (content_info.rejected) {
HandleRejectedContent(content_info, description);
continue;
}
if (IsBundled(content_info.name) && content_info.name != *bundled_mid()) {
if (!HandleBundledContent(content_info)) {
return RTCError(RTCErrorType::INVALID_PARAMETER,
"Failed to process the bundled m= section.");
}
continue;
}
error = ValidateContent(content_info);
if (!error.ok()) {
return error;
}
std::vector<int> extension_ids;
absl::optional<std::string> media_alt_protocol;
absl::optional<std::string> data_alt_protocol;
if (bundled_mid() && content_info.name == *bundled_mid()) {
extension_ids = merged_encrypted_extension_ids;
media_alt_protocol = bundle_media_alt_protocol;
data_alt_protocol = bundle_data_alt_protocol;
} else {
extension_ids = GetEncryptedHeaderExtensionIds(content_info);
switch (media_description->type()) {
case cricket::MEDIA_TYPE_AUDIO:
case cricket::MEDIA_TYPE_VIDEO:
media_alt_protocol = media_description->alt_protocol();
break;
case cricket::MEDIA_TYPE_DATA:
data_alt_protocol = media_description->alt_protocol();
break;
}
}
int rtp_abs_sendtime_extn_id =
GetRtpAbsSendTimeHeaderExtensionId(content_info);
cricket::JsepTransport* transport =
GetJsepTransportForMid(content_info.name);
RTC_DCHECK(transport);
SetIceRole_n(DetermineIceRole(transport, transport_info, type, local));
cricket::JsepTransportDescription jsep_description =
CreateJsepTransportDescription(content_info, transport_info,
extension_ids, rtp_abs_sendtime_extn_id,
media_alt_protocol, data_alt_protocol);
if (local) {
error =
transport->SetLocalJsepTransportDescription(jsep_description, type);
} else {
error =
transport->SetRemoteJsepTransportDescription(jsep_description, type);
}
if (!error.ok()) {
LOG_AND_RETURN_ERROR(RTCErrorType::INVALID_PARAMETER,
"Failed to apply the description for " +
content_info.name + ": " + error.message());
}
}
if (type == SdpType::kAnswer) {
pending_mids_.clear();
}
return RTCError::OK();
}
RTCError JsepTransportController::ValidateAndMaybeUpdateBundleGroup(
bool local,
SdpType type,
const cricket::SessionDescription* description) {
RTC_DCHECK(description);
const cricket::ContentGroup* new_bundle_group =
description->GetGroupByName(cricket::GROUP_TYPE_BUNDLE);
// The BUNDLE group containing a MID that no m= section has is invalid.
if (new_bundle_group) {
for (const auto& content_name : new_bundle_group->content_names()) {
if (!description->GetContentByName(content_name)) {
return RTCError(RTCErrorType::INVALID_PARAMETER,
"The BUNDLE group contains MID:" + content_name +
" matching no m= section.");
}
}
}
if (type == SdpType::kAnswer) {
const cricket::ContentGroup* offered_bundle_group =
local ? remote_desc_->GetGroupByName(cricket::GROUP_TYPE_BUNDLE)
: local_desc_->GetGroupByName(cricket::GROUP_TYPE_BUNDLE);
if (new_bundle_group) {
// The BUNDLE group in answer should be a subset of offered group.
for (const auto& content_name : new_bundle_group->content_names()) {
if (!offered_bundle_group ||
!offered_bundle_group->HasContentName(content_name)) {
return RTCError(RTCErrorType::INVALID_PARAMETER,
"The BUNDLE group in answer contains a MID that was "
"not in the offered group.");
}
}
}
if (bundle_group_) {
for (const auto& content_name : bundle_group_->content_names()) {
// An answer that removes m= sections from pre-negotiated BUNDLE group
// without rejecting it, is invalid.
if (!new_bundle_group ||
!new_bundle_group->HasContentName(content_name)) {
auto* content_info = description->GetContentByName(content_name);
if (!content_info || !content_info->rejected) {
return RTCError(RTCErrorType::INVALID_PARAMETER,
"Answer cannot remove m= section " + content_name +
" from already-established BUNDLE group.");
}
}
}
}
}
if (config_.bundle_policy ==
PeerConnectionInterface::kBundlePolicyMaxBundle &&
!description->HasGroup(cricket::GROUP_TYPE_BUNDLE)) {
return RTCError(RTCErrorType::INVALID_PARAMETER,
"max-bundle is used but no bundle group found.");
}
if (ShouldUpdateBundleGroup(type, description)) {
bundle_group_ = *new_bundle_group;
}
if (!bundled_mid()) {
return RTCError::OK();
}
auto bundled_content = description->GetContentByName(*bundled_mid());
if (!bundled_content) {
return RTCError(
RTCErrorType::INVALID_PARAMETER,
"An m= section associated with the BUNDLE-tag doesn't exist.");
}
// If the |bundled_content| is rejected, other contents in the bundle group
// should be rejected.
if (bundled_content->rejected) {
for (const auto& content_name : bundle_group_->content_names()) {
auto other_content = description->GetContentByName(content_name);
if (!other_content->rejected) {
return RTCError(
RTCErrorType::INVALID_PARAMETER,
"The m= section:" + content_name + " should be rejected.");
}
}
}
return RTCError::OK();
}
RTCError JsepTransportController::ValidateContent(
const cricket::ContentInfo& content_info) {
if (config_.rtcp_mux_policy ==
PeerConnectionInterface::kRtcpMuxPolicyRequire &&
content_info.type == cricket::MediaProtocolType::kRtp &&
!content_info.media_description()->rtcp_mux()) {
return RTCError(RTCErrorType::INVALID_PARAMETER,
"The m= section:" + content_info.name +
" is invalid. RTCP-MUX is not "
"enabled when it is required.");
}
return RTCError::OK();
}
void JsepTransportController::HandleRejectedContent(
const cricket::ContentInfo& content_info,
const cricket::SessionDescription* description) {
// If the content is rejected, let the
// BaseChannel/SctpTransport change the RtpTransport/DtlsTransport first,
// then destroy the cricket::JsepTransport.
RemoveTransportForMid(content_info.name);
if (content_info.name == bundled_mid()) {
for (const auto& content_name : bundle_group_->content_names()) {
RemoveTransportForMid(content_name);
}
bundle_group_.reset();
} else if (IsBundled(content_info.name)) {
// Remove the rejected content from the |bundle_group_|.
bundle_group_->RemoveContentName(content_info.name);
// Reset the bundle group if nothing left.
if (!bundle_group_->FirstContentName()) {
bundle_group_.reset();
}
}
MaybeDestroyJsepTransport(content_info.name);
}
bool JsepTransportController::HandleBundledContent(
const cricket::ContentInfo& content_info) {
auto jsep_transport = GetJsepTransportByName(*bundled_mid());
RTC_DCHECK(jsep_transport);
// If the content is bundled, let the
// BaseChannel/SctpTransport change the RtpTransport/DtlsTransport first,
// then destroy the cricket::JsepTransport.
if (SetTransportForMid(content_info.name, jsep_transport)) {
// TODO(bugs.webrtc.org/9719) For media transport this is far from ideal,
// because it means that we first create media transport and start
// connecting it, and then we destroy it. We will need to address it before
// video path is enabled.
MaybeDestroyJsepTransport(content_info.name);
return true;
}
return false;
}
bool JsepTransportController::SetTransportForMid(
const std::string& mid,
cricket::JsepTransport* jsep_transport) {
RTC_DCHECK(jsep_transport);
if (mid_to_transport_[mid] == jsep_transport) {
return true;
}
RTC_DCHECK_RUN_ON(network_thread_);
pending_mids_.push_back(mid);
mid_to_transport_[mid] = jsep_transport;
return config_.transport_observer->OnTransportChanged(
mid, jsep_transport->rtp_transport(), jsep_transport->RtpDtlsTransport(),
jsep_transport->data_channel_transport());
}
void JsepTransportController::RemoveTransportForMid(const std::string& mid) {
bool ret = config_.transport_observer->OnTransportChanged(mid, nullptr,
nullptr, nullptr);
// Calling OnTransportChanged with nullptr should always succeed, since it is
// only expected to fail when adding media to a transport (not removing).
RTC_DCHECK(ret);
mid_to_transport_.erase(mid);
}
cricket::JsepTransportDescription
JsepTransportController::CreateJsepTransportDescription(
const cricket::ContentInfo& content_info,
const cricket::TransportInfo& transport_info,
const std::vector<int>& encrypted_extension_ids,
int rtp_abs_sendtime_extn_id,
absl::optional<std::string> media_alt_protocol,
absl::optional<std::string> data_alt_protocol) {
const cricket::MediaContentDescription* content_desc =
content_info.media_description();
RTC_DCHECK(content_desc);
bool rtcp_mux_enabled = content_info.type == cricket::MediaProtocolType::kSctp
? true
: content_desc->rtcp_mux();
return cricket::JsepTransportDescription(
rtcp_mux_enabled, content_desc->cryptos(), encrypted_extension_ids,
rtp_abs_sendtime_extn_id, transport_info.description, media_alt_protocol,
data_alt_protocol);
}
bool JsepTransportController::ShouldUpdateBundleGroup(
SdpType type,
const cricket::SessionDescription* description) {
if (config_.bundle_policy ==
PeerConnectionInterface::kBundlePolicyMaxBundle) {
return true;
}
if (type != SdpType::kAnswer) {
return false;
}
RTC_DCHECK(local_desc_ && remote_desc_);
const cricket::ContentGroup* local_bundle =
local_desc_->GetGroupByName(cricket::GROUP_TYPE_BUNDLE);
const cricket::ContentGroup* remote_bundle =
remote_desc_->GetGroupByName(cricket::GROUP_TYPE_BUNDLE);
return local_bundle && remote_bundle;
}
std::vector<int> JsepTransportController::GetEncryptedHeaderExtensionIds(
const cricket::ContentInfo& content_info) {
const cricket::MediaContentDescription* content_desc =
content_info.media_description();
if (!config_.crypto_options.srtp.enable_encrypted_rtp_header_extensions) {
return std::vector<int>();
}
std::vector<int> encrypted_header_extension_ids;
for (const auto& extension : content_desc->rtp_header_extensions()) {
if (!extension.encrypt) {
continue;
}
if (!absl::c_linear_search(encrypted_header_extension_ids, extension.id)) {
encrypted_header_extension_ids.push_back(extension.id);
}
}
return encrypted_header_extension_ids;
}
std::vector<int>
JsepTransportController::MergeEncryptedHeaderExtensionIdsForBundle(
const cricket::SessionDescription* description) {
RTC_DCHECK(description);
RTC_DCHECK(bundle_group_);
std::vector<int> merged_ids;
// Union the encrypted header IDs in the group when bundle is enabled.
for (const cricket::ContentInfo& content_info : description->contents()) {
if (bundle_group_->HasContentName(content_info.name)) {
std::vector<int> extension_ids =
GetEncryptedHeaderExtensionIds(content_info);
for (int id : extension_ids) {
if (!absl::c_linear_search(merged_ids, id)) {
merged_ids.push_back(id);
}
}
}
}
return merged_ids;
}
RTCError JsepTransportController::GetAltProtocolsForBundle(
const cricket::SessionDescription* description,
absl::optional<std::string>* media_alt_protocol,
absl::optional<std::string>* data_alt_protocol) {
RTC_DCHECK(description);
RTC_DCHECK(bundle_group_);
RTC_DCHECK(media_alt_protocol);
RTC_DCHECK(data_alt_protocol);
bool found_media = false;
bool found_data = false;
for (const cricket::ContentInfo& content : description->contents()) {
if (bundle_group_->HasContentName(content.name)) {
const cricket::MediaContentDescription* media_description =
content.media_description();
switch (media_description->type()) {
case cricket::MEDIA_TYPE_AUDIO:
case cricket::MEDIA_TYPE_VIDEO:
if (found_media &&
*media_alt_protocol != media_description->alt_protocol()) {