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style: rework query handling

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This commit is contained in:
xaos 2023-02-27 03:10:47 +01:00
parent 0c040f6376
commit 0a768b5234
1 changed files with 25 additions and 16 deletions
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35
stub.go
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@ -186,18 +186,27 @@ func (s *StubDNS) make_handler(fqdn string, txt string) dns.HandlerFunc {
q := r.Question[0]
domain := q.Name
valid := r.Response == false &&
(q.Qclass == dns.ClassINET || q.Qclass == dns.ClassANY) &&
q.Qtype == dns.TypeTXT
if !valid {
logger.Debug("invalid request header")
m.Rcode = dns.RcodeNotImplemented
reject_and_log := func(code int, reason string) {
m.Rcode = code
m.Answer = []dns.RR{}
} else if domain != fqdn {
logger.Debug("invalid domain")
m.Rcode = dns.RcodeNameError
m.Answer = []dns.RR{}
} else {
logger.Debug(
"rejecting query",
zap.String("reason", reason),
zap.Object("response", LoggableDNSMsg{m}),
)
w.WriteMsg(m)
}
switch {
case r.Response:
reject_and_log(dns.RcodeRefused, "not a query")
case !(q.Qclass == dns.ClassINET || q.Qclass == dns.ClassANY):
reject_and_log(dns.RcodeNotImplemented, "invalid class")
case q.Qtype != dns.TypeTXT:
reject_and_log(dns.RcodeNotImplemented, "invalid type")
case domain != fqdn:
reject_and_log(dns.RcodeNameError, "wrong domain")
default:
m.Authoritative = true
rr := new(dns.TXT)
rr.Hdr = dns.RR_Header{
@ -208,13 +217,13 @@ func (s *StubDNS) make_handler(fqdn string, txt string) dns.HandlerFunc {
}
rr.Txt = []string{txt}
m.Answer = []dns.RR{rr}
}
logger.Debug(
"sending response",
"replying",
zap.Object("response", LoggableDNSMsg{m}),
)
w.WriteMsg(m)
}
}
return handler
}