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chore: quic sniffer should use the exact length of crypto stream when assembling

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This commit is contained in:
wwqgtxx 2025-04-12 22:27:07 +08:00
parent 84cd0ef688
commit fe01033efe
1 changed files with 12 additions and 4 deletions
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16
component/sniffer/quic_sniffer.go
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@ -399,9 +399,7 @@ func (q *quicPacketSender) readQuicData(b []byte) error {
} }
} }
_ = q.tryAssemble() return q.tryAssemble()
return nil
} }
func (q *quicPacketSender) tryAssemble() error { func (q *quicPacketSender) tryAssemble() error {
@ -415,7 +413,17 @@ func (q *quicPacketSender) tryAssemble() error {
if len(q.ranges) != 1 || q.ranges[0].Start() != 0 || q.ranges[0].End() != uint64(len(q.buffer)) { if len(q.ranges) != 1 || q.ranges[0].Start() != 0 || q.ranges[0].End() != uint64(len(q.buffer)) {
q.lock.RUnlock() q.lock.RUnlock()
return ErrNoClue // incomplete fragment, just return
return nil
}
if len(q.buffer) <= 4 ||
// Handshake Type (1) + uint24 Length (3) + ClientHello body
// maxCryptoStreamOffset is in the valid range of uint16 so just ignore the q.buffer[1]
int(binary.BigEndian.Uint16([]byte{q.buffer[2], q.buffer[3]})+4) != len(q.buffer) {
q.lock.RUnlock()
// end of segment not reached, just return
return nil
} }
domain, err := ReadClientHello(q.buffer) domain, err := ReadClientHello(q.buffer)