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chore: write dns reply in single syscall
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This commit is contained in:
wwqgtxx 2025-06-07 00:38:39 +08:00
parent 40587b62b8
commit 939e4109d7
1 changed files with 12 additions and 5 deletions
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17
component/resolver/relay.go
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@ -46,17 +46,24 @@ func RelayDnsConn(ctx context.Context, conn net.Conn, readTimeout time.Duration)
ctx, cancel := context.WithTimeout(ctx, DefaultDnsRelayTimeout)
defer cancel()
inData := buff[:n]
msg, err := relayDnsPacket(ctx, inData, buff, 0)
outBuff := buff[2:]
msg, err := relayDnsPacket(ctx, inData, outBuff, 0)
if err != nil {
return err
}
err = binary.Write(conn, binary.BigEndian, uint16(len(msg)))
if err != nil {
return err
if &msg[0] == &outBuff[0] { // msg is still in the buff
binary.BigEndian.PutUint16(buff[:2], uint16(len(msg)))
outBuff = buff[:2+len(msg)]
} else { // buff not big enough (WTF???)
newBuff := pool.Get(len(msg) + 2)
defer pool.Put(newBuff)
binary.BigEndian.PutUint16(newBuff[:2], uint16(len(msg)))
copy(newBuff[2:], msg)
outBuff = newBuff
}
_, err = conn.Write(msg)
_, err = conn.Write(outBuff)
if err != nil {
return err
}