| /* |
| * Copyright 2012 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 "api/jsepsessiondescription.h" |
| |
| #include <memory> |
| |
| #include "p2p/base/port.h" |
| #include "pc/mediasession.h" |
| #include "pc/webrtcsdp.h" |
| #include "rtc_base/arraysize.h" |
| #include "rtc_base/ptr_util.h" |
| #include "rtc_base/stringencode.h" |
| |
| using cricket::SessionDescription; |
| |
| namespace webrtc { |
| namespace { |
| |
| // RFC 5245 |
| // It is RECOMMENDED that default candidates be chosen based on the |
| // likelihood of those candidates to work with the peer that is being |
| // contacted. It is RECOMMENDED that relayed > reflexive > host. |
| constexpr int kPreferenceUnknown = 0; |
| constexpr int kPreferenceHost = 1; |
| constexpr int kPreferenceReflexive = 2; |
| constexpr int kPreferenceRelayed = 3; |
| |
| constexpr char kDummyAddress[] = "0.0.0.0"; |
| constexpr int kDummyPort = 9; |
| |
| int GetCandidatePreferenceFromType(const std::string& type) { |
| int preference = kPreferenceUnknown; |
| if (type == cricket::LOCAL_PORT_TYPE) { |
| preference = kPreferenceHost; |
| } else if (type == cricket::STUN_PORT_TYPE) { |
| preference = kPreferenceReflexive; |
| } else if (type == cricket::RELAY_PORT_TYPE) { |
| preference = kPreferenceRelayed; |
| } else { |
| preference = kPreferenceUnknown; |
| } |
| return preference; |
| } |
| |
| // Update the connection address for the MediaContentDescription based on the |
| // candidates. |
| void UpdateConnectionAddress( |
| const JsepCandidateCollection& candidate_collection, |
| cricket::ContentDescription* content_description) { |
| int port = kDummyPort; |
| std::string ip = kDummyAddress; |
| int current_preference = kPreferenceUnknown; |
| int current_family = AF_UNSPEC; |
| for (size_t i = 0; i < candidate_collection.count(); ++i) { |
| const IceCandidateInterface* jsep_candidate = candidate_collection.at(i); |
| if (jsep_candidate->candidate().component() != |
| cricket::ICE_CANDIDATE_COMPONENT_RTP) { |
| continue; |
| } |
| // Default destination should be UDP only. |
| if (jsep_candidate->candidate().protocol() != cricket::UDP_PROTOCOL_NAME) { |
| continue; |
| } |
| const int preference = |
| GetCandidatePreferenceFromType(jsep_candidate->candidate().type()); |
| const int family = jsep_candidate->candidate().address().ipaddr().family(); |
| // See if this candidate is more preferable then the current one if it's the |
| // same family. Or if the current family is IPv4 already so we could safely |
| // ignore all IPv6 ones. WebRTC bug 4269. |
| // http://code.google.com/p/webrtc/issues/detail?id=4269 |
| if ((preference <= current_preference && current_family == family) || |
| (current_family == AF_INET && family == AF_INET6)) { |
| continue; |
| } |
| current_preference = preference; |
| current_family = family; |
| port = jsep_candidate->candidate().address().port(); |
| ip = jsep_candidate->candidate().address().ipaddr().ToString(); |
| } |
| rtc::SocketAddress connection_addr; |
| connection_addr.SetIP(ip); |
| connection_addr.SetPort(port); |
| static_cast<cricket::MediaContentDescription*>(content_description) |
| ->set_connection_address(connection_addr); |
| } |
| |
| } // namespace |
| |
| const char SessionDescriptionInterface::kOffer[] = "offer"; |
| const char SessionDescriptionInterface::kPrAnswer[] = "pranswer"; |
| const char SessionDescriptionInterface::kAnswer[] = "answer"; |
| |
| const int JsepSessionDescription::kDefaultVideoCodecId = 100; |
| const char JsepSessionDescription::kDefaultVideoCodecName[] = "VP8"; |
| |
| const char* SdpTypeToString(SdpType type) { |
| switch (type) { |
| case SdpType::kOffer: |
| return SessionDescriptionInterface::kOffer; |
| case SdpType::kPrAnswer: |
| return SessionDescriptionInterface::kPrAnswer; |
| case SdpType::kAnswer: |
| return SessionDescriptionInterface::kAnswer; |
| } |
| return ""; |
| } |
| |
| rtc::Optional<SdpType> SdpTypeFromString(const std::string& type_str) { |
| if (type_str == SessionDescriptionInterface::kOffer) { |
| return SdpType::kOffer; |
| } else if (type_str == SessionDescriptionInterface::kPrAnswer) { |
| return SdpType::kPrAnswer; |
| } else if (type_str == SessionDescriptionInterface::kAnswer) { |
| return SdpType::kAnswer; |
| } else { |
| return rtc::nullopt; |
| } |
| } |
| |
| // TODO(steveanton): Remove this default implementation once Chromium has been |
| // updated. |
| SdpType SessionDescriptionInterface::GetType() const { |
| rtc::Optional<SdpType> maybe_type = SdpTypeFromString(type()); |
| if (maybe_type) { |
| return *maybe_type; |
| } else { |
| RTC_LOG(LS_WARNING) << "Default implementation of " |
| "SessionDescriptionInterface::GetType does not " |
| "recognize the result from type(), returning " |
| "kOffer."; |
| return SdpType::kOffer; |
| } |
| } |
| |
| SessionDescriptionInterface* CreateSessionDescription(const std::string& type, |
| const std::string& sdp, |
| SdpParseError* error) { |
| rtc::Optional<SdpType> maybe_type = SdpTypeFromString(type); |
| if (!maybe_type) { |
| return nullptr; |
| } |
| |
| return CreateSessionDescription(*maybe_type, sdp, error).release(); |
| } |
| |
| std::unique_ptr<SessionDescriptionInterface> CreateSessionDescription( |
| SdpType type, |
| const std::string& sdp) { |
| return CreateSessionDescription(type, sdp, nullptr); |
| } |
| |
| std::unique_ptr<SessionDescriptionInterface> CreateSessionDescription( |
| SdpType type, |
| const std::string& sdp, |
| SdpParseError* error_out) { |
| auto jsep_desc = rtc::MakeUnique<JsepSessionDescription>(type); |
| if (!SdpDeserialize(sdp, jsep_desc.get(), error_out)) { |
| return nullptr; |
| } |
| return std::move(jsep_desc); |
| } |
| |
| JsepSessionDescription::JsepSessionDescription(SdpType type) : type_(type) {} |
| |
| JsepSessionDescription::JsepSessionDescription(const std::string& type) { |
| rtc::Optional<SdpType> maybe_type = SdpTypeFromString(type); |
| if (maybe_type) { |
| type_ = *maybe_type; |
| } else { |
| RTC_LOG(LS_WARNING) |
| << "JsepSessionDescription constructed with invalid type string: " |
| << type << ". Assuming it is an offer."; |
| type_ = SdpType::kOffer; |
| } |
| } |
| |
| JsepSessionDescription::~JsepSessionDescription() {} |
| |
| bool JsepSessionDescription::Initialize( |
| cricket::SessionDescription* description, |
| const std::string& session_id, |
| const std::string& session_version) { |
| if (!description) |
| return false; |
| |
| session_id_ = session_id; |
| session_version_ = session_version; |
| description_.reset(description); |
| candidate_collection_.resize(number_of_mediasections()); |
| return true; |
| } |
| |
| bool JsepSessionDescription::AddCandidate( |
| const IceCandidateInterface* candidate) { |
| if (!candidate || candidate->sdp_mline_index() < 0) |
| return false; |
| size_t mediasection_index = 0; |
| if (!GetMediasectionIndex(candidate, &mediasection_index)) { |
| return false; |
| } |
| if (mediasection_index >= number_of_mediasections()) |
| return false; |
| const std::string& content_name = |
| description_->contents()[mediasection_index].name; |
| const cricket::TransportInfo* transport_info = |
| description_->GetTransportInfoByName(content_name); |
| if (!transport_info) { |
| return false; |
| } |
| |
| cricket::Candidate updated_candidate = candidate->candidate(); |
| if (updated_candidate.username().empty()) { |
| updated_candidate.set_username(transport_info->description.ice_ufrag); |
| } |
| if (updated_candidate.password().empty()) { |
| updated_candidate.set_password(transport_info->description.ice_pwd); |
| } |
| |
| std::unique_ptr<JsepIceCandidate> updated_candidate_wrapper( |
| new JsepIceCandidate(candidate->sdp_mid(), |
| static_cast<int>(mediasection_index), |
| updated_candidate)); |
| if (!candidate_collection_[mediasection_index].HasCandidate( |
| updated_candidate_wrapper.get())) { |
| candidate_collection_[mediasection_index].add( |
| updated_candidate_wrapper.release()); |
| UpdateConnectionAddress( |
| candidate_collection_[mediasection_index], |
| description_->contents()[mediasection_index].description); |
| } |
| |
| return true; |
| } |
| |
| size_t JsepSessionDescription::RemoveCandidates( |
| const std::vector<cricket::Candidate>& candidates) { |
| size_t num_removed = 0; |
| for (auto& candidate : candidates) { |
| int mediasection_index = GetMediasectionIndex(candidate); |
| if (mediasection_index < 0) { |
| // Not found. |
| continue; |
| } |
| num_removed += candidate_collection_[mediasection_index].remove(candidate); |
| UpdateConnectionAddress( |
| candidate_collection_[mediasection_index], |
| description_->contents()[mediasection_index].description); |
| } |
| return num_removed; |
| } |
| |
| size_t JsepSessionDescription::number_of_mediasections() const { |
| if (!description_) |
| return 0; |
| return description_->contents().size(); |
| } |
| |
| const IceCandidateCollection* JsepSessionDescription::candidates( |
| size_t mediasection_index) const { |
| if (mediasection_index >= candidate_collection_.size()) |
| return NULL; |
| return &candidate_collection_[mediasection_index]; |
| } |
| |
| bool JsepSessionDescription::ToString(std::string* out) const { |
| if (!description_ || !out) { |
| return false; |
| } |
| *out = SdpSerialize(*this, false); |
| return !out->empty(); |
| } |
| |
| bool JsepSessionDescription::GetMediasectionIndex( |
| const IceCandidateInterface* candidate, |
| size_t* index) { |
| if (!candidate || !index) { |
| return false; |
| } |
| *index = static_cast<size_t>(candidate->sdp_mline_index()); |
| if (description_ && !candidate->sdp_mid().empty()) { |
| bool found = false; |
| // Try to match the sdp_mid with content name. |
| for (size_t i = 0; i < description_->contents().size(); ++i) { |
| if (candidate->sdp_mid() == description_->contents().at(i).name) { |
| *index = i; |
| found = true; |
| break; |
| } |
| } |
| if (!found) { |
| // If the sdp_mid is presented but we can't find a match, we consider |
| // this as an error. |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| int JsepSessionDescription::GetMediasectionIndex( |
| const cricket::Candidate& candidate) { |
| // Find the description with a matching transport name of the candidate. |
| const std::string& transport_name = candidate.transport_name(); |
| for (size_t i = 0; i < description_->contents().size(); ++i) { |
| if (transport_name == description_->contents().at(i).name) { |
| return static_cast<int>(i); |
| } |
| } |
| return -1; |
| } |
| |
| } // namespace webrtc |