| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <webrtc/MyWebSocketHandler.h> |
| |
| #include "Utils.h" |
| |
| #include <json/json.h> |
| |
| #include <netdb.h> |
| #include <openssl/rand.h> |
| |
| #include <webrtc/Keyboard.h> |
| |
| namespace { |
| |
| // helper method to ensure a json object has the required fields convertible |
| // to the appropriate types. |
| bool validateJsonObject( |
| const Json::Value &obj, const std::string &type, |
| const std::vector<std::pair<std::string, Json::ValueType>> &fields, |
| std::function<void(const std::string&)> onError) { |
| for (const auto &field_spec : fields) { |
| const auto &field_name = field_spec.first; |
| auto field_type = field_spec.second; |
| if (!(obj.isMember(field_name) && |
| obj[field_name].isConvertibleTo(field_type))) { |
| std::string error_msg = "Expected a field named '"; |
| error_msg += field_name + "' of type '"; |
| error_msg += std::to_string(field_type); |
| error_msg += "'"; |
| if (!type.empty()) { |
| error_msg += " in message of type '" + type + "'"; |
| } |
| error_msg += "."; |
| LOG(WARNING) << error_msg; |
| onError(error_msg); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| } // namespace |
| |
| MyWebSocketHandler::MyWebSocketHandler( |
| std::shared_ptr<RunLoop> runLoop, |
| std::shared_ptr<ServerState> serverState, |
| size_t handlerId) |
| : mRunLoop(runLoop), |
| mServerState(serverState), |
| mId(handlerId), |
| mOptions(OptionBits::useSingleCertificateForAllTracks), |
| mTouchSink(mServerState->getTouchSink()), |
| mKeyboardSink(mServerState->getKeyboardSink()) { |
| } |
| |
| MyWebSocketHandler::~MyWebSocketHandler() { |
| mServerState->releaseHandlerId(mId); |
| } |
| |
| int MyWebSocketHandler::handleMessage( |
| uint8_t /* headerByte */, const uint8_t *msg, size_t len) { |
| // android::hexdump(msg, len); |
| |
| Json::Value obj; |
| Json::Reader json_reader; |
| Json::FastWriter json_writer; |
| auto str = reinterpret_cast<const char *>(msg); |
| if (!json_reader.parse(str, str + len, obj) < 0) { |
| return -EINVAL; |
| } |
| |
| LOG(VERBOSE) << obj.toStyledString(); |
| |
| auto sendMessageOnError = |
| [this](const std::string &error_msg) { |
| auto reply = "{\"error\": \"" + error_msg + "\"}"; |
| sendMessage(reply.c_str(), reply.size()); |
| }; |
| |
| if (!validateJsonObject(obj, "", {{"type", Json::ValueType::stringValue}}, |
| sendMessageOnError)) { |
| return -EINVAL; |
| } |
| std::string type = obj["type"].asString(); |
| |
| if (type == "greeting") { |
| Json::Value reply; |
| reply["type"] = "hello"; |
| reply["reply"] = "Right back at ya!"; |
| |
| auto replyAsString = json_writer.write(reply); |
| sendMessage(replyAsString.c_str(), replyAsString.size()); |
| |
| if (obj.isMember("path")) { |
| parseOptions(obj["path"].asString()); |
| } |
| |
| if (mOptions & OptionBits::useSingleCertificateForAllTracks) { |
| mCertificateAndKey = CreateDTLSCertificateAndKey(); |
| } |
| |
| prepareSessions(); |
| } else if (type == "set-remote-desc") { |
| if (!validateJsonObject(obj, type, |
| {{"sdp", Json::ValueType::stringValue}}, |
| sendMessageOnError)) { |
| return -EINVAL; |
| } |
| |
| int err = mOfferedSDP.setTo(obj["sdp"].asString()); |
| |
| if (err) { |
| LOG(ERROR) << "Offered SDP could not be parsed (" << err << ")"; |
| } |
| |
| for (size_t i = 0; i < mSessions.size(); ++i) { |
| const auto &session = mSessions[i]; |
| |
| session->setRemoteParams( |
| getRemoteUFrag(i), |
| getRemotePassword(i), |
| getRemoteFingerprint(i)); |
| } |
| |
| return err; |
| } else if (type == "request-offer") { |
| std::stringstream ss; |
| |
| ss << |
| "v=0\r\n" |
| "o=- 7794515898627856655 2 IN IP4 127.0.0.1\r\n" |
| "s=-\r\n" |
| "t=0 0\r\n" |
| "a=msid-semantic: WMS pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw\r\n"; |
| |
| bool bundled = false; |
| |
| if ((mOptions & OptionBits::bundleTracks) && countTracks() > 1) { |
| bundled = true; |
| |
| ss << "a=group:BUNDLE 0"; |
| |
| if (!(mOptions & OptionBits::disableAudio)) { |
| ss << " 1"; |
| } |
| |
| if (mOptions & OptionBits::enableData) { |
| ss << " 2"; |
| } |
| |
| ss << "\r\n"; |
| |
| emitTrackIceOptionsAndFingerprint(ss, 0 /* mlineIndex */); |
| } |
| |
| size_t mlineIndex = 0; |
| |
| // Video track (mid = 0) |
| |
| std::string videoEncodingSpecific = "a=rtpmap:96 VP8/90000\r\n"; |
| |
| videoEncodingSpecific += |
| "a=rtcp-fb:96 ccm fir\r\n" |
| "a=rtcp-fb:96 nack\r\n" |
| "a=rtcp-fb:96 nack pli\r\n"; |
| |
| ss << |
| "m=video 9 " |
| << ((mOptions & OptionBits::useTCP) ? "TCP" : "UDP") |
| << "/TLS/RTP/SAVPF 96 97\r\n" |
| "c=IN IP4 0.0.0.0\r\n" |
| "a=rtcp:9 IN IP4 0.0.0.0\r\n"; |
| |
| if (!bundled) { |
| emitTrackIceOptionsAndFingerprint(ss, mlineIndex++); |
| } |
| |
| ss << |
| "a=setup:actpass\r\n" |
| "a=mid:0\r\n" |
| "a=sendonly\r\n" |
| "a=rtcp-mux\r\n" |
| "a=rtcp-rsize\r\n" |
| "a=rtcp-xr:rcvr-rtt=all\r\n"; |
| |
| ss << videoEncodingSpecific << |
| "a=rtpmap:97 rtx/90000\r\n" |
| "a=fmtp:97 apt=96\r\n" |
| "a=ssrc-group:FID 3735928559 3405689008\r\n" |
| "a=ssrc:3735928559 cname:myWebRTP\r\n" |
| "a=ssrc:3735928559 msid:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw 61843855-edd7-4ca9-be79-4e3ccc6cc035\r\n" |
| "a=ssrc:3735928559 mslabel:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw\r\n" |
| "a=ssrc:3735928559 label:61843855-edd7-4ca9-be79-4e3ccc6cc035\r\n" |
| "a=ssrc:3405689008 cname:myWebRTP\r\n" |
| "a=ssrc:3405689008 msid:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw 61843855-edd7-4ca9-be79-4e3ccc6cc035\r\n" |
| "a=ssrc:3405689008 mslabel:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw\r\n" |
| "a=ssrc:3405689008 label:61843855-edd7-4ca9-be79-4e3ccc6cc035\r\n"; |
| |
| if (!(mOptions & OptionBits::disableAudio)) { |
| ss << |
| "m=audio 9 " |
| << ((mOptions & OptionBits::useTCP) ? "TCP" : "UDP") |
| << "/TLS/RTP/SAVPF 98\r\n" |
| "c=IN IP4 0.0.0.0\r\n" |
| "a=rtcp:9 IN IP4 0.0.0.0\r\n"; |
| |
| if (!bundled) { |
| emitTrackIceOptionsAndFingerprint(ss, mlineIndex++); |
| } |
| |
| ss << |
| "a=setup:actpass\r\n" |
| "a=mid:1\r\n" |
| "a=sendonly\r\n" |
| "a=msid:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw 61843856-edd7-4ca9-be79-4e3ccc6cc035\r\n" |
| "a=rtcp-mux\r\n" |
| "a=rtcp-rsize\r\n" |
| "a=rtpmap:98 opus/48000/2\r\n" |
| "a=fmtp:98 minptime=10;useinbandfec=1\r\n" |
| "a=ssrc-group:FID 2343432205\r\n" |
| "a=ssrc:2343432205 cname:myWebRTP\r\n" |
| "a=ssrc:2343432205 msid:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw 61843856-edd7-4ca9-be79-4e3ccc6cc035\r\n" |
| "a=ssrc:2343432205 mslabel:pqWEULZNyLiJHA7lcwlUnbule9FJNk0pY0aw\r\n" |
| "a=ssrc:2343432205 label:61843856-edd7-4ca9-be79-4e3ccc6cc035\r\n"; |
| } |
| |
| if (mOptions & OptionBits::enableData) { |
| ss << |
| "m=application 9 " |
| << ((mOptions & OptionBits::useTCP) ? "TCP" : "UDP") |
| << "/DTLS/SCTP webrtc-datachannel\r\n" |
| "c=IN IP4 0.0.0.0\r\n" |
| "a=sctp-port:5000\r\n"; |
| |
| if (!bundled) { |
| emitTrackIceOptionsAndFingerprint(ss, mlineIndex++); |
| } |
| |
| ss << |
| "a=setup:actpass\r\n" |
| "a=mid:2\r\n" |
| "a=sendrecv\r\n" |
| "a=fmtp:webrtc-datachannel max-message-size=65536\r\n"; |
| } |
| |
| Json::Value reply; |
| reply["type"] = "offer"; |
| reply["sdp"] = ss.str(); |
| |
| auto replyAsString = json_writer.write(reply); |
| sendMessage(replyAsString.c_str(), replyAsString.size()); |
| } else if (type == "get-ice-candidate") { |
| if (!validateJsonObject(obj, type, {{"mid", Json::ValueType::intValue}}, |
| sendMessageOnError)) { |
| return -EINVAL; |
| } |
| int32_t mid = obj["mid"].asInt(); |
| |
| bool success = getCandidate(mid); |
| |
| if (!success) { |
| Json::Value reply; |
| reply["type"] = "ice-candidate"; |
| |
| auto replyAsString = json_writer.write(reply); |
| sendMessage(replyAsString.c_str(), replyAsString.size()); |
| } |
| } else if (type == "set-mouse-position") { |
| if (!validateJsonObject(obj, type, {{"down", Json::ValueType::intValue}, |
| {"x", Json::ValueType::intValue}, |
| {"y", Json::ValueType::intValue}}, |
| sendMessageOnError)) { |
| return -EINVAL; |
| } |
| int32_t down = obj["down"].asInt(); |
| int32_t x = obj["x"].asInt(); |
| int32_t y = obj["y"].asInt(); |
| |
| LOG(VERBOSE) |
| << "set-mouse-position(" << down << ", " << x << ", " << y << ")"; |
| |
| mTouchSink->injectTouchEvent(x, y, down != 0); |
| } else if (type == "inject-multi-touch") { |
| if (!validateJsonObject(obj, type, {{"id", Json::ValueType::intValue}, |
| {"initialDown", Json::ValueType::intValue}, |
| {"x", Json::ValueType::intValue}, |
| {"y", Json::ValueType::intValue}, |
| {"slot", Json::ValueType::intValue}}, |
| sendMessageOnError)) { |
| return -EINVAL; |
| } |
| int32_t id = obj["id"].asInt(); |
| int32_t initialDown = obj["initialDown"].asInt(); |
| int32_t x = obj["x"].asInt(); |
| int32_t y = obj["y"].asInt(); |
| int32_t slot = obj["slot"].asInt(); |
| |
| LOG(VERBOSE) |
| << "inject-multi-touch id=" |
| << id |
| << ", initialDown=" |
| << initialDown |
| << ", x=" |
| << x |
| << ", y=" |
| << y |
| << ", slot=" |
| << slot; |
| |
| mTouchSink->injectMultiTouchEvent(id, slot, x, y, initialDown); |
| } else if (type == "key-event") { |
| if (!validateJsonObject(obj, type, {{"event_type", Json::ValueType::stringValue}, |
| {"keycode", Json::ValueType::stringValue}}, |
| sendMessageOnError)) { |
| return -EINVAL; |
| } |
| auto down = obj["event_type"].asString() == std::string("keydown"); |
| auto code = DomKeyCodeToLinux(obj["keycode"].asString()); |
| mKeyboardSink->injectEvent(down, code); |
| } |
| |
| return 0; |
| } |
| |
| size_t MyWebSocketHandler::countTracks() const { |
| size_t n = 1; // We always have a video track. |
| |
| if (!(mOptions & OptionBits::disableAudio)) { |
| ++n; |
| } |
| |
| if (mOptions & OptionBits::enableData) { |
| ++n; |
| } |
| |
| return n; |
| } |
| |
| ssize_t MyWebSocketHandler::mlineIndexForMid(int32_t mid) const { |
| switch (mid) { |
| case 0: |
| return 0; |
| |
| case 1: |
| if (mOptions & OptionBits::disableAudio) { |
| return -1; |
| } |
| |
| return 1; |
| |
| case 2: |
| if (!(mOptions & OptionBits::enableData)) { |
| return -1; |
| } |
| |
| if (mOptions & OptionBits::disableAudio) { |
| return 1; |
| } |
| |
| return 2; |
| |
| default: |
| return -1; |
| } |
| } |
| |
| bool MyWebSocketHandler::getCandidate(int32_t mid) { |
| auto mlineIndex = mlineIndexForMid(mid); |
| |
| if (mlineIndex < 0) { |
| return false; |
| } |
| |
| if (!(mOptions & OptionBits::bundleTracks) || mRTPs.empty()) { |
| // Only allocate a local port once if we bundle tracks. |
| |
| size_t sessionIndex = mlineIndex; |
| |
| uint32_t trackMask = 0; |
| if (mOptions & OptionBits::bundleTracks) { |
| sessionIndex = 0; // One session for all tracks. |
| |
| trackMask = RTPSocketHandler::TRACK_VIDEO; |
| |
| if (!(mOptions & OptionBits::disableAudio)) { |
| trackMask |= RTPSocketHandler::TRACK_AUDIO; |
| } |
| |
| if (mOptions & OptionBits::enableData) { |
| trackMask |= RTPSocketHandler::TRACK_DATA; |
| } |
| } else if (mid == 0) { |
| trackMask = RTPSocketHandler::TRACK_VIDEO; |
| } else if (mid == 1) { |
| trackMask = RTPSocketHandler::TRACK_AUDIO; |
| } else { |
| trackMask = RTPSocketHandler::TRACK_DATA; |
| } |
| |
| const auto &session = mSessions[sessionIndex]; |
| |
| auto rtp = std::make_shared<RTPSocketHandler>( |
| mRunLoop, |
| mServerState, |
| (mOptions & OptionBits::useTCP) |
| ? RTPSocketHandler::TransportType::TCP |
| : RTPSocketHandler::TransportType::UDP, |
| PF_INET, |
| trackMask, |
| session); |
| |
| rtp->run(); |
| |
| mRTPs.push_back(rtp); |
| } |
| |
| auto rtp = mRTPs.back(); |
| |
| Json::Value reply; |
| reply["type"] = "ice-candidate"; |
| |
| auto localIPString = rtp->getLocalIPString(); |
| |
| std::stringstream ss; |
| ss << "candidate:0 1 "; |
| |
| if (mOptions & OptionBits::useTCP) { |
| ss << "tcp"; |
| } else { |
| ss << "UDP"; |
| } |
| |
| // see rfc8445, 5.1.2.1. for the derivation of "2122121471" below. |
| ss << " 2122121471 " << localIPString << " " << rtp->getLocalPort() << " typ host "; |
| |
| if (mOptions & OptionBits::useTCP) { |
| ss << "tcptype passive "; |
| } |
| |
| ss << "generation 0 ufrag " << rtp->getLocalUFrag(); |
| |
| reply["candidate"] = ss.str(); |
| reply["mlineIndex"] = static_cast<Json::UInt64>(mlineIndex); |
| |
| Json::FastWriter json_writer; |
| auto replyAsString = json_writer.write(reply); |
| sendMessage(replyAsString.c_str(), replyAsString.size()); |
| |
| return true; |
| } |
| |
| std::optional<std::string> MyWebSocketHandler::getSDPValue( |
| ssize_t targetMediaIndex, |
| std::string_view key, |
| bool fallthroughToGeneralSection) const { |
| |
| CHECK_GE(targetMediaIndex, -1); |
| |
| if (targetMediaIndex + 1 >= mOfferedSDP.countSections()) { |
| LOG(ERROR) |
| << "getSDPValue: targetMediaIndex " |
| << targetMediaIndex |
| << " out of range (countSections()=" |
| << mOfferedSDP.countSections() |
| << ")"; |
| |
| return std::nullopt; |
| } |
| |
| const std::string prefix = "a=" + std::string(key) + ":"; |
| |
| auto sectionIndex = 1 + targetMediaIndex; |
| auto rangeEnd = mOfferedSDP.section_end(sectionIndex); |
| |
| auto it = std::find_if( |
| mOfferedSDP.section_begin(sectionIndex), |
| rangeEnd, |
| [prefix](const auto &line) { |
| return StartsWith(line, prefix); |
| }); |
| |
| if (it == rangeEnd) { |
| if (fallthroughToGeneralSection) { |
| CHECK_NE(targetMediaIndex, -1); |
| |
| // Oh no, scary recursion ahead. |
| return getSDPValue( |
| -1 /* targetMediaIndex */, |
| key, |
| false /* fallthroughToGeneralSection */); |
| } |
| |
| LOG(WARNING) |
| << "Unable to find '" |
| << prefix |
| << "' with targetMediaIndex=" |
| << targetMediaIndex; |
| |
| return std::nullopt; |
| } |
| |
| return (*it).substr(prefix.size()); |
| } |
| |
| std::string MyWebSocketHandler::getRemotePassword(size_t mlineIndex) const { |
| auto value = getSDPValue( |
| mlineIndex, "ice-pwd", true /* fallthroughToGeneralSection */); |
| |
| return value ? *value : std::string(); |
| } |
| |
| std::string MyWebSocketHandler::getRemoteUFrag(size_t mlineIndex) const { |
| auto value = getSDPValue( |
| mlineIndex, "ice-ufrag", true /* fallthroughToGeneralSection */); |
| |
| return value ? *value : std::string(); |
| } |
| |
| std::string MyWebSocketHandler::getRemoteFingerprint(size_t mlineIndex) const { |
| auto value = getSDPValue( |
| mlineIndex, "fingerprint", true /* fallthroughToGeneralSection */); |
| |
| return value ? *value : std::string(); |
| } |
| |
| // static |
| std::pair<std::shared_ptr<X509>, std::shared_ptr<EVP_PKEY>> |
| MyWebSocketHandler::CreateDTLSCertificateAndKey() { |
| // Modeled after "https://stackoverflow.com/questions/256405/ |
| // programmatically-create-x509-certificate-using-openssl". |
| |
| std::shared_ptr<EVP_PKEY> pkey(EVP_PKEY_new(), EVP_PKEY_free); |
| |
| std::unique_ptr<RSA, std::function<void(RSA *)>> rsa( |
| RSA_new(), RSA_free); |
| |
| BIGNUM exponent; |
| BN_init(&exponent); |
| BN_set_word(&exponent, RSA_F4); |
| |
| int res = RSA_generate_key_ex( |
| rsa.get() /* rsa */, 2048, &exponent, nullptr /* callback */); |
| |
| CHECK_EQ(res, 1); |
| |
| EVP_PKEY_assign_RSA(pkey.get(), rsa.release()); |
| |
| std::shared_ptr<X509> x509(X509_new(), X509_free); |
| |
| ASN1_INTEGER_set(X509_get_serialNumber(x509.get()), 1); |
| |
| X509_gmtime_adj(X509_get_notBefore(x509.get()), 0); |
| X509_gmtime_adj(X509_get_notAfter(x509.get()), 60 * 60 * 24 * 7); // 7 days. |
| |
| X509_set_pubkey(x509.get(), pkey.get()); |
| |
| X509_NAME *name = X509_get_subject_name(x509.get()); |
| |
| X509_NAME_add_entry_by_txt( |
| name, "C", MBSTRING_ASC, (unsigned char *)"US", -1, -1, 0); |
| |
| X509_NAME_add_entry_by_txt( |
| name, |
| "O", |
| MBSTRING_ASC, |
| (unsigned char *)"Beyond Aggravated", |
| -1, |
| -1, |
| 0); |
| |
| X509_NAME_add_entry_by_txt( |
| name, "CN", MBSTRING_ASC, (unsigned char *)"localhost", -1, -1, 0); |
| |
| X509_set_issuer_name(x509.get(), name); |
| |
| auto digest = EVP_sha256(); |
| |
| X509_sign(x509.get(), pkey.get(), digest); |
| |
| return std::make_pair(x509, pkey); |
| } |
| |
| void MyWebSocketHandler::parseOptions(const std::string &pathAndQuery) { |
| auto separatorPos = pathAndQuery.find('?'); |
| |
| if (separatorPos == std::string::npos) { |
| return; |
| } |
| |
| auto components = SplitString(pathAndQuery.substr(separatorPos + 1), '&'); |
| for (auto name : components) { |
| bool boolValue = true; |
| |
| separatorPos = name.find('='); |
| if (separatorPos != std::string::npos) { |
| boolValue = false; |
| |
| auto value = name.substr(separatorPos + 1); |
| name.erase(separatorPos); |
| |
| boolValue = |
| !strcasecmp("true", value.c_str()) |
| || !strcasecmp("yes", value.c_str()) |
| || value == "1"; |
| } |
| |
| if (name == "disable_audio") { |
| auto mask = OptionBits::disableAudio; |
| mOptions = (mOptions & ~mask) | (boolValue ? mask : 0); |
| } else if (name == "bundle_tracks" && boolValue) { |
| auto mask = OptionBits::bundleTracks; |
| mOptions = (mOptions & ~mask) | (boolValue ? mask : 0); |
| } else if (name == "enable_data" && boolValue) { |
| auto mask = OptionBits::enableData; |
| mOptions = (mOptions & ~mask) | (boolValue ? mask : 0); |
| } else if (name == "use_tcp" && boolValue) { |
| auto mask = OptionBits::useTCP; |
| mOptions = (mOptions & ~mask) | (boolValue ? mask : 0); |
| } |
| } |
| } |
| |
| // static |
| void MyWebSocketHandler::CreateRandomIceCharSequence(char *dst, size_t size) { |
| // Per RFC 5245 an ice-char is alphanumeric, '+' or '/', i.e. 64 distinct |
| // character values (6 bit). |
| |
| CHECK_EQ(1, RAND_bytes(reinterpret_cast<unsigned char *>(dst), size)); |
| |
| for (size_t i = 0; i < size; ++i) { |
| char x = dst[i] & 0x3f; |
| if (x < 26) { |
| x += 'a'; |
| } else if (x < 52) { |
| x += 'A' - 26; |
| } else if (x < 62) { |
| x += '0' - 52; |
| } else if (x < 63) { |
| x = '+'; |
| } else { |
| x = '/'; |
| } |
| |
| dst[i] = x; |
| } |
| } |
| |
| std::pair<std::string, std::string> |
| MyWebSocketHandler::createUniqueUFragAndPassword() { |
| // RFC 5245, section 15.4 mandates that uFrag is at least 4 and password |
| // at least 22 ice-chars long. |
| |
| char uFragChars[4]; |
| |
| for (;;) { |
| CreateRandomIceCharSequence(uFragChars, sizeof(uFragChars)); |
| |
| std::string uFrag(uFragChars, sizeof(uFragChars)); |
| |
| auto it = std::find_if( |
| mSessions.begin(), mSessions.end(), |
| [uFrag](const auto &session) { |
| return session->localUFrag() == uFrag; |
| }); |
| |
| if (it == mSessions.end()) { |
| // This uFrag is not in use yet. |
| break; |
| } |
| } |
| |
| char passwordChars[22]; |
| CreateRandomIceCharSequence(passwordChars, sizeof(passwordChars)); |
| |
| return std::make_pair( |
| std::string(uFragChars, sizeof(uFragChars)), |
| std::string(passwordChars, sizeof(passwordChars))); |
| } |
| |
| void MyWebSocketHandler::prepareSessions() { |
| size_t numSessions = |
| (mOptions & OptionBits::bundleTracks) ? 1 : countTracks(); |
| |
| for (size_t i = 0; i < numSessions; ++i) { |
| auto [ufrag, password] = createUniqueUFragAndPassword(); |
| |
| auto [certificate, key] = |
| (mOptions & OptionBits::useSingleCertificateForAllTracks) |
| ? mCertificateAndKey : CreateDTLSCertificateAndKey(); |
| |
| mSessions.push_back( |
| std::make_shared<RTPSession>( |
| ufrag, password, certificate, key)); |
| } |
| } |
| |
| void MyWebSocketHandler::emitTrackIceOptionsAndFingerprint( |
| std::stringstream &ss, size_t mlineIndex) const { |
| CHECK_LT(mlineIndex, mSessions.size()); |
| const auto &session = mSessions[mlineIndex]; |
| |
| ss << "a=ice-ufrag:" << session->localUFrag() << "\r\n"; |
| ss << "a=ice-pwd:" << session->localPassword() << "\r\n"; |
| ss << "a=ice-options:trickle\r\n"; |
| ss << "a=fingerprint:" << session->localFingerprint() << "\r\n"; |
| } |
