miracle091/dnscrypt-proxy
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dnscrypt-proxy
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Code Issues Releases Wiki Activity

Properly set DNS flags when creating empty responses

This commit is contained in:
Frank Denis 2019-12-11 09:00:29 +01:00
parent 3b4d6c532d
commit ee1c0fed93
1 changed files with 15 additions and 14 deletions
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29
dnscrypt-proxy/dnsutils.go
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@ -9,29 +9,30 @@ import (
"github.com/miekg/dns"
)
func EmptyResponseFromMessage(srcMsg *dns.Msg) *dns.Msg {
dstMsg := *srcMsg
dstMsg.Response = true
if srcMsg.RecursionDesired {
dstMsg.RecursionAvailable = true
}
dstMsg.RecursionDesired = false
dstMsg.CheckingDisabled = false
dstMsg.Answer = make([]dns.RR, 0)
dstMsg.Ns = make([]dns.RR, 0)
dstMsg.Extra = make([]dns.RR, 0)
return &dstMsg
}
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 := EmptyResponseFromMessage(srcMsg)
dstMsg.Truncated = true
return dstMsg.Pack()
}
func EmptyResponseFromMessage(srcMsg *dns.Msg) *dns.Msg {
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
}
func RefusedResponseFromMessage(srcMsg *dns.Msg, refusedCode bool, ipv4 net.IP, ipv6 net.IP, ttl uint32) *dns.Msg {
dstMsg := EmptyResponseFromMessage(srcMsg)
if refusedCode {