106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
/*
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* Copyright 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "pc/media_protocol_names.h"
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#include <ctype.h>
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#include <stddef.h>
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#include <string>
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namespace cricket {
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// The official registry of RTP parameters is at
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// http://www.iana.org/assignments/rtp-parameters/rtp-parameters.xml
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// The UDP/DTLS and TCP/DTLS prefixes are not registered there.
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// There are multiple variants of the RTP protocol stack, including
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// UDP/TLS/RTP/SAVPF (WebRTC default), RTP/AVP, RTP/AVPF, RTP/SAVPF,
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// TCP/DTLS/RTP/SAVPF and so on. We accept anything that has RTP/
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// embedded in it somewhere as being an RTP protocol.
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const char kMediaProtocolRtpPrefix[] = "RTP/";
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// Protocol names generated by WebRTC
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const char kMediaProtocolSctp[] = "SCTP";
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const char kMediaProtocolUdpDtlsSctp[] = "UDP/DTLS/SCTP";
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const char kMediaProtocolDtlsSctp[] = "DTLS/SCTP";
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const char kMediaProtocolTcpDtlsSctp[] = "TCP/DTLS/SCTP";
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// RFC5124
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const char kMediaProtocolDtlsSavpf[] = "UDP/TLS/RTP/SAVPF";
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const char kMediaProtocolSavpf[] = "RTP/SAVPF";
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const char kMediaProtocolAvpf[] = "RTP/AVPF";
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namespace {
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// Protocol names that we tolerate, but do not generate.
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// We always generate offers with "UDP/TLS/RTP/SAVPF" when using DTLS-SRTP,
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// but we tolerate "RTP/SAVPF" and "RTP/SAVP" and the "UDP/TLS" and "TCP/TLS"
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// prefixes in offers we receive, for compatibility.
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// RFC4585
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const char kMediaProtocolSavp[] = "RTP/SAVP";
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const char kMediaProtocolAvp[] = "RTP/AVP";
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const char kMediaProtocolTcpTlsSavpf[] = "TCP/TLS/RTP/SAVPF";
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const char kMediaProtocolUdpTlsSavpf[] = "UDP/TLS/RTP/SAVPF";
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const char kMediaProtocolTcpTlsSavp[] = "TCP/TLS/RTP/SAVP";
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const char kMediaProtocolUdpTlsSavp[] = "UDP/TLS/RTP/SAVP";
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} // namespace
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bool IsDtlsSctp(absl::string_view protocol) {
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return protocol == kMediaProtocolDtlsSctp ||
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protocol == kMediaProtocolUdpDtlsSctp ||
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protocol == kMediaProtocolTcpDtlsSctp;
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}
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bool IsPlainSctp(absl::string_view protocol) {
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return protocol == kMediaProtocolSctp;
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}
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bool IsSctpProtocol(absl::string_view protocol) {
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return IsPlainSctp(protocol) || IsDtlsSctp(protocol);
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}
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bool IsRtpProtocol(absl::string_view protocol) {
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if (protocol.empty()) {
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return true;
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}
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size_t pos = protocol.find(cricket::kMediaProtocolRtpPrefix);
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if (pos == std::string::npos) {
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return false;
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}
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// RTP must be at the beginning of a string or not preceded by alpha
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if (pos == 0 || !isalpha(protocol[pos - 1])) {
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return true;
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}
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return false;
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}
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// Note that the below functions support some protocol strings purely for
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// legacy compatibility, as required by JSEP in Section 5.1.2, Profile Names
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// and Interoperability.
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bool IsDtlsRtp(absl::string_view protocol) {
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// Most-likely values first.
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return protocol == kMediaProtocolDtlsSavpf ||
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protocol == kMediaProtocolTcpTlsSavpf ||
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protocol == kMediaProtocolUdpTlsSavpf ||
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protocol == kMediaProtocolUdpTlsSavp ||
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protocol == kMediaProtocolTcpTlsSavp;
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}
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bool IsPlainRtp(absl::string_view protocol) {
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// Most-likely values first.
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return protocol == kMediaProtocolSavpf || protocol == kMediaProtocolAvpf ||
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protocol == kMediaProtocolSavp || protocol == kMediaProtocolAvp;
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}
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} // namespace cricket
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