Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
Steve Anton | 10542f2 | 2019-01-11 09:11:00 -0800 | [diff] [blame] | 11 | #include "pc/dtls_srtp_transport.h" |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 12 | |
Yves Gerey | 3e70781 | 2018-11-28 16:47:49 +0100 | [diff] [blame] | 13 | #include <string.h> |
Jonas Olsson | a4d8737 | 2019-07-05 19:08:33 +0200 | [diff] [blame] | 14 | |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 15 | #include <string> |
| 16 | #include <utility> |
| 17 | |
Yves Gerey | 3e70781 | 2018-11-28 16:47:49 +0100 | [diff] [blame] | 18 | #include "rtc_base/checks.h" |
| 19 | #include "rtc_base/logging.h" |
Steve Anton | 10542f2 | 2019-01-11 09:11:00 -0800 | [diff] [blame] | 20 | #include "rtc_base/ssl_stream_adapter.h" |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 21 | |
| 22 | namespace { |
| 23 | // Value specified in RFC 5764. |
| 24 | static const char kDtlsSrtpExporterLabel[] = "EXTRACTOR-dtls_srtp"; |
| 25 | } // namespace |
| 26 | |
| 27 | namespace webrtc { |
| 28 | |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 29 | DtlsSrtpTransport::DtlsSrtpTransport(bool rtcp_mux_enabled) |
| 30 | : SrtpTransport(rtcp_mux_enabled) {} |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 31 | |
| 32 | void DtlsSrtpTransport::SetDtlsTransports( |
| 33 | cricket::DtlsTransportInternal* rtp_dtls_transport, |
| 34 | cricket::DtlsTransportInternal* rtcp_dtls_transport) { |
| 35 | // Transport names should be the same. |
| 36 | if (rtp_dtls_transport && rtcp_dtls_transport) { |
| 37 | RTC_DCHECK(rtp_dtls_transport->transport_name() == |
| 38 | rtcp_dtls_transport->transport_name()); |
| 39 | } |
| 40 | |
| 41 | // When using DTLS-SRTP, we must reset the SrtpTransport every time the |
| 42 | // DtlsTransport changes and wait until the DTLS handshake is complete to set |
| 43 | // the newly negotiated parameters. |
Zhi Huang | b57e169 | 2018-06-12 11:41:11 -0700 | [diff] [blame] | 44 | // If |active_reset_srtp_params_| is true, intentionally reset the SRTP |
| 45 | // parameter even though the DtlsTransport may not change. |
| 46 | if (IsSrtpActive() && (rtp_dtls_transport != rtp_dtls_transport_ || |
| 47 | active_reset_srtp_params_)) { |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 48 | ResetParams(); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 49 | } |
| 50 | |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 51 | const std::string transport_name = |
| 52 | rtp_dtls_transport ? rtp_dtls_transport->transport_name() : "null"; |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 53 | |
Taylor Brandstetter | 53e43b3 | 2018-04-19 14:44:12 -0700 | [diff] [blame] | 54 | if (rtcp_dtls_transport && rtcp_dtls_transport != rtcp_dtls_transport_) { |
| 55 | // This would only be possible if using BUNDLE but not rtcp-mux, which isn't |
| 56 | // allowed according to the BUNDLE spec. |
| 57 | RTC_CHECK(!(IsSrtpActive())) |
| 58 | << "Setting RTCP for DTLS/SRTP after the DTLS is active " |
| 59 | "should never happen."; |
| 60 | } |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 61 | |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 62 | RTC_LOG(LS_INFO) << "Setting RTCP Transport on " << transport_name |
| 63 | << " transport " << rtcp_dtls_transport; |
| 64 | SetRtcpDtlsTransport(rtcp_dtls_transport); |
| 65 | SetRtcpPacketTransport(rtcp_dtls_transport); |
| 66 | |
| 67 | RTC_LOG(LS_INFO) << "Setting RTP Transport on " << transport_name |
| 68 | << " transport " << rtp_dtls_transport; |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 69 | SetRtpDtlsTransport(rtp_dtls_transport); |
| 70 | SetRtpPacketTransport(rtp_dtls_transport); |
| 71 | |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 72 | MaybeSetupDtlsSrtp(); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | void DtlsSrtpTransport::SetRtcpMuxEnabled(bool enable) { |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 76 | SrtpTransport::SetRtcpMuxEnabled(enable); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 77 | if (enable) { |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 78 | MaybeSetupDtlsSrtp(); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 79 | } |
| 80 | } |
| 81 | |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 82 | void DtlsSrtpTransport::UpdateSendEncryptedHeaderExtensionIds( |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 83 | const std::vector<int>& send_extension_ids) { |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 84 | if (send_extension_ids_ == send_extension_ids) { |
| 85 | return; |
| 86 | } |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 87 | send_extension_ids_.emplace(send_extension_ids); |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 88 | if (DtlsHandshakeCompleted()) { |
| 89 | // Reset the crypto parameters to update the send extension IDs. |
| 90 | SetupRtpDtlsSrtp(); |
| 91 | } |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 92 | } |
| 93 | |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 94 | void DtlsSrtpTransport::UpdateRecvEncryptedHeaderExtensionIds( |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 95 | const std::vector<int>& recv_extension_ids) { |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 96 | if (recv_extension_ids_ == recv_extension_ids) { |
| 97 | return; |
| 98 | } |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 99 | recv_extension_ids_.emplace(recv_extension_ids); |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 100 | if (DtlsHandshakeCompleted()) { |
| 101 | // Reset the crypto parameters to update the receive extension IDs. |
| 102 | SetupRtpDtlsSrtp(); |
| 103 | } |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | bool DtlsSrtpTransport::IsDtlsActive() { |
| 107 | auto rtcp_dtls_transport = |
| 108 | rtcp_mux_enabled() ? nullptr : rtcp_dtls_transport_; |
| 109 | return (rtp_dtls_transport_ && rtp_dtls_transport_->IsDtlsActive() && |
| 110 | (!rtcp_dtls_transport || rtcp_dtls_transport->IsDtlsActive())); |
| 111 | } |
| 112 | |
| 113 | bool DtlsSrtpTransport::IsDtlsConnected() { |
| 114 | auto rtcp_dtls_transport = |
| 115 | rtcp_mux_enabled() ? nullptr : rtcp_dtls_transport_; |
| 116 | return (rtp_dtls_transport_ && |
| 117 | rtp_dtls_transport_->dtls_state() == |
| 118 | cricket::DTLS_TRANSPORT_CONNECTED && |
| 119 | (!rtcp_dtls_transport || rtcp_dtls_transport->dtls_state() == |
| 120 | cricket::DTLS_TRANSPORT_CONNECTED)); |
| 121 | } |
| 122 | |
| 123 | bool DtlsSrtpTransport::IsDtlsWritable() { |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 124 | auto rtcp_packet_transport = |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 125 | rtcp_mux_enabled() ? nullptr : rtcp_dtls_transport_; |
| 126 | return rtp_dtls_transport_ && rtp_dtls_transport_->writable() && |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 127 | (!rtcp_packet_transport || rtcp_packet_transport->writable()); |
| 128 | } |
| 129 | |
| 130 | bool DtlsSrtpTransport::DtlsHandshakeCompleted() { |
| 131 | return IsDtlsActive() && IsDtlsConnected(); |
| 132 | } |
| 133 | |
| 134 | void DtlsSrtpTransport::MaybeSetupDtlsSrtp() { |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 135 | if (IsSrtpActive() || !IsDtlsWritable()) { |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 136 | return; |
| 137 | } |
| 138 | |
| 139 | SetupRtpDtlsSrtp(); |
| 140 | |
| 141 | if (!rtcp_mux_enabled() && rtcp_dtls_transport_) { |
| 142 | SetupRtcpDtlsSrtp(); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | void DtlsSrtpTransport::SetupRtpDtlsSrtp() { |
| 147 | // Use an empty encrypted header extension ID vector if not set. This could |
| 148 | // happen when the DTLS handshake is completed before processing the |
| 149 | // Offer/Answer which contains the encrypted header extension IDs. |
| 150 | std::vector<int> send_extension_ids; |
| 151 | std::vector<int> recv_extension_ids; |
| 152 | if (send_extension_ids_) { |
| 153 | send_extension_ids = *send_extension_ids_; |
| 154 | } |
| 155 | if (recv_extension_ids_) { |
| 156 | recv_extension_ids = *recv_extension_ids_; |
| 157 | } |
| 158 | |
| 159 | int selected_crypto_suite; |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 160 | rtc::ZeroOnFreeBuffer<unsigned char> send_key; |
| 161 | rtc::ZeroOnFreeBuffer<unsigned char> recv_key; |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 162 | |
| 163 | if (!ExtractParams(rtp_dtls_transport_, &selected_crypto_suite, &send_key, |
| 164 | &recv_key) || |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 165 | !SetRtpParams(selected_crypto_suite, &send_key[0], |
| 166 | static_cast<int>(send_key.size()), send_extension_ids, |
| 167 | selected_crypto_suite, &recv_key[0], |
| 168 | static_cast<int>(recv_key.size()), recv_extension_ids)) { |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 169 | SignalDtlsSrtpSetupFailure(this, /*rtcp=*/false); |
| 170 | RTC_LOG(LS_WARNING) << "DTLS-SRTP key installation for RTP failed"; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | void DtlsSrtpTransport::SetupRtcpDtlsSrtp() { |
| 175 | // Return if the DTLS-SRTP is active because the encrypted header extension |
| 176 | // IDs don't need to be updated for RTCP and the crypto params don't need to |
| 177 | // be reset. |
Zhi Huang | e830e68 | 2018-03-30 10:48:35 -0700 | [diff] [blame] | 178 | if (IsSrtpActive()) { |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 179 | return; |
| 180 | } |
| 181 | |
| 182 | std::vector<int> send_extension_ids; |
| 183 | std::vector<int> recv_extension_ids; |
| 184 | if (send_extension_ids_) { |
| 185 | send_extension_ids = *send_extension_ids_; |
| 186 | } |
| 187 | if (recv_extension_ids_) { |
| 188 | recv_extension_ids = *recv_extension_ids_; |
| 189 | } |
| 190 | |
| 191 | int selected_crypto_suite; |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 192 | rtc::ZeroOnFreeBuffer<unsigned char> rtcp_send_key; |
| 193 | rtc::ZeroOnFreeBuffer<unsigned char> rtcp_recv_key; |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 194 | if (!ExtractParams(rtcp_dtls_transport_, &selected_crypto_suite, |
| 195 | &rtcp_send_key, &rtcp_recv_key) || |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 196 | !SetRtcpParams(selected_crypto_suite, &rtcp_send_key[0], |
| 197 | static_cast<int>(rtcp_send_key.size()), send_extension_ids, |
| 198 | selected_crypto_suite, &rtcp_recv_key[0], |
| 199 | static_cast<int>(rtcp_recv_key.size()), |
| 200 | recv_extension_ids)) { |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 201 | SignalDtlsSrtpSetupFailure(this, /*rtcp=*/true); |
| 202 | RTC_LOG(LS_WARNING) << "DTLS-SRTP key installation for RTCP failed"; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | bool DtlsSrtpTransport::ExtractParams( |
| 207 | cricket::DtlsTransportInternal* dtls_transport, |
| 208 | int* selected_crypto_suite, |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 209 | rtc::ZeroOnFreeBuffer<unsigned char>* send_key, |
| 210 | rtc::ZeroOnFreeBuffer<unsigned char>* recv_key) { |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 211 | if (!dtls_transport || !dtls_transport->IsDtlsActive()) { |
| 212 | return false; |
| 213 | } |
| 214 | |
| 215 | if (!dtls_transport->GetSrtpCryptoSuite(selected_crypto_suite)) { |
| 216 | RTC_LOG(LS_ERROR) << "No DTLS-SRTP selected crypto suite"; |
| 217 | return false; |
| 218 | } |
| 219 | |
| 220 | RTC_LOG(LS_INFO) << "Extracting keys from transport: " |
| 221 | << dtls_transport->transport_name(); |
| 222 | |
| 223 | int key_len; |
| 224 | int salt_len; |
| 225 | if (!rtc::GetSrtpKeyAndSaltLengths((*selected_crypto_suite), &key_len, |
| 226 | &salt_len)) { |
| 227 | RTC_LOG(LS_ERROR) << "Unknown DTLS-SRTP crypto suite" |
| 228 | << selected_crypto_suite; |
| 229 | return false; |
| 230 | } |
| 231 | |
| 232 | // OK, we're now doing DTLS (RFC 5764) |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 233 | rtc::ZeroOnFreeBuffer<unsigned char> dtls_buffer(key_len * 2 + salt_len * 2); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 234 | |
| 235 | // RFC 5705 exporter using the RFC 5764 parameters |
| 236 | if (!dtls_transport->ExportKeyingMaterial(kDtlsSrtpExporterLabel, NULL, 0, |
| 237 | false, &dtls_buffer[0], |
| 238 | dtls_buffer.size())) { |
| 239 | RTC_LOG(LS_WARNING) << "DTLS-SRTP key export failed"; |
| 240 | RTC_NOTREACHED(); // This should never happen |
| 241 | return false; |
| 242 | } |
| 243 | |
| 244 | // Sync up the keys with the DTLS-SRTP interface |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 245 | rtc::ZeroOnFreeBuffer<unsigned char> client_write_key(key_len + salt_len); |
| 246 | rtc::ZeroOnFreeBuffer<unsigned char> server_write_key(key_len + salt_len); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 247 | size_t offset = 0; |
| 248 | memcpy(&client_write_key[0], &dtls_buffer[offset], key_len); |
| 249 | offset += key_len; |
| 250 | memcpy(&server_write_key[0], &dtls_buffer[offset], key_len); |
| 251 | offset += key_len; |
| 252 | memcpy(&client_write_key[key_len], &dtls_buffer[offset], salt_len); |
| 253 | offset += salt_len; |
| 254 | memcpy(&server_write_key[key_len], &dtls_buffer[offset], salt_len); |
| 255 | |
| 256 | rtc::SSLRole role; |
Zhi Huang | e818b6e | 2018-02-22 15:26:27 -0800 | [diff] [blame] | 257 | if (!dtls_transport->GetDtlsRole(&role)) { |
| 258 | RTC_LOG(LS_WARNING) << "Failed to get the DTLS role."; |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 259 | return false; |
| 260 | } |
| 261 | |
| 262 | if (role == rtc::SSL_SERVER) { |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 263 | *send_key = std::move(server_write_key); |
| 264 | *recv_key = std::move(client_write_key); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 265 | } else { |
Joachim Bauch | 5b32f23 | 2018-03-07 20:02:26 +0100 | [diff] [blame] | 266 | *send_key = std::move(client_write_key); |
| 267 | *recv_key = std::move(server_write_key); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 268 | } |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 269 | return true; |
| 270 | } |
| 271 | |
| 272 | void DtlsSrtpTransport::SetDtlsTransport( |
| 273 | cricket::DtlsTransportInternal* new_dtls_transport, |
| 274 | cricket::DtlsTransportInternal** old_dtls_transport) { |
Zhi Huang | cd3fc5d | 2017-11-29 10:41:57 -0800 | [diff] [blame] | 275 | if (*old_dtls_transport == new_dtls_transport) { |
| 276 | return; |
| 277 | } |
| 278 | |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 279 | if (*old_dtls_transport) { |
| 280 | (*old_dtls_transport)->SignalDtlsState.disconnect(this); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | *old_dtls_transport = new_dtls_transport; |
| 284 | |
| 285 | if (new_dtls_transport) { |
| 286 | new_dtls_transport->SignalDtlsState.connect( |
| 287 | this, &DtlsSrtpTransport::OnDtlsState); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 288 | } |
| 289 | } |
| 290 | |
| 291 | void DtlsSrtpTransport::SetRtpDtlsTransport( |
| 292 | cricket::DtlsTransportInternal* rtp_dtls_transport) { |
| 293 | SetDtlsTransport(rtp_dtls_transport, &rtp_dtls_transport_); |
| 294 | } |
| 295 | |
| 296 | void DtlsSrtpTransport::SetRtcpDtlsTransport( |
| 297 | cricket::DtlsTransportInternal* rtcp_dtls_transport) { |
| 298 | SetDtlsTransport(rtcp_dtls_transport, &rtcp_dtls_transport_); |
| 299 | } |
| 300 | |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 301 | void DtlsSrtpTransport::OnDtlsState(cricket::DtlsTransportInternal* transport, |
| 302 | cricket::DtlsTransportState state) { |
| 303 | RTC_DCHECK(transport == rtp_dtls_transport_ || |
| 304 | transport == rtcp_dtls_transport_); |
| 305 | |
Jonas Olsson | 635474e | 2018-10-18 15:58:17 +0200 | [diff] [blame] | 306 | SignalDtlsStateChange(); |
| 307 | |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 308 | if (state != cricket::DTLS_TRANSPORT_CONNECTED) { |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 309 | ResetParams(); |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 310 | return; |
| 311 | } |
| 312 | |
| 313 | MaybeSetupDtlsSrtp(); |
| 314 | } |
| 315 | |
Zhi Huang | 365381f | 2018-04-13 16:44:34 -0700 | [diff] [blame] | 316 | void DtlsSrtpTransport::OnWritableState( |
| 317 | rtc::PacketTransportInternal* packet_transport) { |
| 318 | MaybeSetupDtlsSrtp(); |
Zhi Huang | 95e7dbb | 2018-03-29 00:08:03 +0000 | [diff] [blame] | 319 | } |
| 320 | |
Zhi Huang | f2d7beb | 2017-11-20 14:35:11 -0800 | [diff] [blame] | 321 | } // namespace webrtc |