09c94fa443
Reply to queries when you have a wildcard in the zone. This works for DNS and DNSSEC. Thing missing is NODATA responses for that specific wildcard. Add wildcard_test.go as well.
65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
package file
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import "github.com/miekg/dns"
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// ClosestEncloser returns the closest encloser for rr.
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func (z *Zone) ClosestEncloser(rr dns.RR) string {
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// tree/tree.go does not store a parent *Node pointer, so we can't
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// just follow up the tree. TODO(miek): fix.
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offset, end := dns.NextLabel(rr.Header().Name, 0)
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for !end {
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elem := z.Tree.Get(rr)
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if elem != nil {
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return elem.Name()
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}
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rr.Header().Name = rr.Header().Name[offset:]
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offset, end = dns.NextLabel(rr.Header().Name, offset)
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}
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return z.SOA.Header().Name
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}
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// nameErrorProof finds the closest encloser and return an NSEC that proofs
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// the wildcard does not exist and an NSEC that proofs the name does no exist.
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func (z *Zone) nameErrorProof(rr dns.RR) []dns.RR {
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elem := z.Tree.Prev(rr)
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if elem == nil {
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return nil
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}
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nsec := z.lookupNSEC(elem, true)
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nsecIndex := 0
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for i := 0; i < len(nsec); i++ {
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if nsec[i].Header().Rrtype == dns.TypeNSEC {
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nsecIndex = i
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break
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}
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}
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// We do this lookup twice, once for wildcard and once for the name proof. TODO(miek): fix
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ce := z.ClosestEncloser(rr)
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wildcard := "*." + ce
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rr.Header().Name = wildcard
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elem = z.Tree.Prev(rr)
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if elem == nil {
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// Root?
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return nil
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}
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nsec1 := z.lookupNSEC(elem, true)
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nsec1Index := 0
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for i := 0; i < len(nsec1); i++ {
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if nsec1[i].Header().Rrtype == dns.TypeNSEC {
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nsec1Index = i
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break
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}
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}
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// Check for duplicate NSEC.
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if nsec[nsecIndex].Header().Name == nsec1[nsec1Index].Header().Name &&
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nsec[nsecIndex].(*dns.NSEC).NextDomain == nsec1[nsec1Index].(*dns.NSEC).NextDomain {
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return nsec
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}
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return append(nsec, nsec1...)
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}
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