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middleware/file: additional section processing (#531)

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Add additional section processing for MX and SRV records. Update the
tests.
This commit is contained in:
Miek Gieben
2017-02-19 20:42:34 +00:00
committed by GitHub
parent ea38b642b8
commit 3e26398e08
2 changed files with 68 additions and 3 deletions
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44
middleware/file/lookup.go
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@@ -139,13 +139,17 @@ func (z *Zone) Lookup(state request.Request, qname string) ([]dns.RR, []dns.RR,
return nil, ret, nil, NoData
}
// Additional section processing for MX, SRV. Check response and see if any of the names are in baliwick -
// if so add IP addresses to the additional section.
additional := additionalProcessing(z, rrs, do)
if do {
sigs := elem.Types(dns.TypeRRSIG)
sigs = signatureForSubType(sigs, qtype)
rrs = append(rrs, sigs...)
}
return rrs, z.ns(do), nil, Success
return rrs, z.ns(do), additional, Success
}
@@ -189,7 +193,7 @@ func (z *Zone) Lookup(state request.Request, qname string) ([]dns.RR, []dns.RR,
rcode := NameError
// Hacky way to get around empty-non-terminals. If a longer name does exist, but this qname, does not, it
// must be an empty-non-terminal. If so, we do the proper NXDOMAIN handling, but the the rcode to be success.
// must be an empty-non-terminal. If so, we do the proper NXDOMAIN handling, but set the rcode to be success.
if x, found := z.Tree.Next(qname); found {
if dns.IsSubDomain(qname, x.Name()) {
rcode = Success
@@ -255,6 +259,7 @@ func (z *Zone) ns(do bool) []dns.RR {
return z.Apex.NS
}
// TODO(miek): should be better named, like aditionalProcessing?
func (z *Zone) searchCNAME(state request.Request, elem *tree.Elem, rrs []dns.RR) ([]dns.RR, []dns.RR, []dns.RR, Result) {
qtype := state.QType()
@@ -395,4 +400,39 @@ func (z *Zone) searchGlue(name string, do bool) []dns.RR {
return glue
}
// additionalProcessing checks the current answer section and retrieves A or AAAA records
// (and possible SIGs) to need to be put in the additional section.
func additionalProcessing(z *Zone, answer []dns.RR, do bool) (extra []dns.RR) {
for _, rr := range answer {
name := ""
switch x := rr.(type) {
case *dns.SRV:
name = x.Target
case *dns.MX:
name = x.Mx
}
if !dns.IsSubDomain(z.origin, name) {
continue
}
elem, _ := z.Tree.Search(name)
if elem == nil {
continue
}
sigs := elem.Types(dns.TypeRRSIG)
for _, addr := range []uint16{dns.TypeA, dns.TypeAAAA} {
if a := elem.Types(addr); a != nil {
extra = append(extra, a...)
if do {
sig := signatureForSubType(sigs, addr)
extra = append(extra, sig...)
}
}
}
}
return extra
}
const maxChain = 8