66 lines
1.8 KiB
Go
66 lines
1.8 KiB
Go
// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package mux
|
|
|
|
// MatchFunc allows custom logic for mapping packets to an Endpoint
|
|
type MatchFunc func([]byte) bool
|
|
|
|
// MatchAll always returns true
|
|
func MatchAll([]byte) bool {
|
|
return true
|
|
}
|
|
|
|
// MatchRange returns true if the first byte of buf is in [lower..upper]
|
|
func MatchRange(lower, upper byte, buf []byte) bool {
|
|
if len(buf) < 1 {
|
|
return false
|
|
}
|
|
b := buf[0]
|
|
return b >= lower && b <= upper
|
|
}
|
|
|
|
// MatchFuncs as described in RFC7983
|
|
// https://tools.ietf.org/html/rfc7983
|
|
// +----------------+
|
|
// | [0..3] -+--> forward to STUN
|
|
// | |
|
|
// | [16..19] -+--> forward to ZRTP
|
|
// | |
|
|
// packet --> | [20..63] -+--> forward to DTLS
|
|
// | |
|
|
// | [64..79] -+--> forward to TURN Channel
|
|
// | |
|
|
// | [128..191] -+--> forward to RTP/RTCP
|
|
// +----------------+
|
|
|
|
// MatchDTLS is a MatchFunc that accepts packets with the first byte in [20..63]
|
|
// as defied in RFC7983
|
|
func MatchDTLS(b []byte) bool {
|
|
return MatchRange(20, 63, b)
|
|
}
|
|
|
|
// MatchSRTPOrSRTCP is a MatchFunc that accepts packets with the first byte in [128..191]
|
|
// as defied in RFC7983
|
|
func MatchSRTPOrSRTCP(b []byte) bool {
|
|
return MatchRange(128, 191, b)
|
|
}
|
|
|
|
func isRTCP(buf []byte) bool {
|
|
// Not long enough to determine RTP/RTCP
|
|
if len(buf) < 4 {
|
|
return false
|
|
}
|
|
return buf[1] >= 192 && buf[1] <= 223
|
|
}
|
|
|
|
// MatchSRTP is a MatchFunc that only matches SRTP and not SRTCP
|
|
func MatchSRTP(buf []byte) bool {
|
|
return MatchSRTPOrSRTCP(buf) && !isRTCP(buf)
|
|
}
|
|
|
|
// MatchSRTCP is a MatchFunc that only matches SRTCP and not SRTP
|
|
func MatchSRTCP(buf []byte) bool {
|
|
return MatchSRTPOrSRTCP(buf) && isRTCP(buf)
|
|
}
|