dnscrypt-proxy/dnscrypt-proxy/dnsutils.go

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package main
import (
"github.com/miekg/dns"
)
func TruncatedResponse(packet []byte) ([]byte, error) {
srcMsg := new(dns.Msg)
if err := srcMsg.Unpack(packet); err != nil {
return nil, err
}
dstMsg := srcMsg
dstMsg.Response = true
dstMsg.Answer = make([]dns.RR, 0)
dstMsg.Ns = make([]dns.RR, 0)
dstMsg.Extra = make([]dns.RR, 0)
dstMsg.Truncated = true
return dstMsg.Pack()
}
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func EmptyResponseFromMessage(srcMsg *dns.Msg) (*dns.Msg, error) {
dstMsg := srcMsg
dstMsg.Response = true
dstMsg.Answer = make([]dns.RR, 0)
dstMsg.Ns = make([]dns.RR, 0)
dstMsg.Extra = make([]dns.RR, 0)
return dstMsg, nil
}
func HasTCFlag(packet []byte) bool {
return packet[2]&2 == 2
}