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hack 16-bit to identify FEC from packet

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xtaci
2020-10-09 14:34:48 +08:00
parent 105bfec567
commit 260f61b3eb
1 changed files with 5 additions and 7 deletions
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sess.go
+5 -7
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@@ -817,13 +817,11 @@ func (l *Listener) packetInput(data []byte, addr net.Addr) {
var conv, sn uint32
convValid := false
if l.fecDecoder != nil {
isfec := binary.LittleEndian.Uint16(data[4:])
if isfec == typeData {
conv = binary.LittleEndian.Uint32(data[fecHeaderSizePlus2:])
sn = binary.LittleEndian.Uint32(data[fecHeaderSizePlus2+IKCP_SN_OFFSET:])
convValid = true
}
fecFlag := binary.LittleEndian.Uint16(data[4:])
if fecFlag == typeData { // 16bit kcp cmd [81-84] and frg [0-255] will not overlap with FEC type 0x00f1 0x00f2
conv = binary.LittleEndian.Uint32(data[fecHeaderSizePlus2:])
sn = binary.LittleEndian.Uint32(data[fecHeaderSizePlus2+IKCP_SN_OFFSET:])
convValid = true
} else {
conv = binary.LittleEndian.Uint32(data)
sn = binary.LittleEndian.Uint32(data[IKCP_SN_OFFSET:])