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correct k8s name parsing response codes (#493)

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This commit is contained in:
Chris O'Haver
2017-01-23 15:11:32 -05:00
committed by Miek Gieben
parent 299360fe01
commit c62bd639ff
2 changed files with 17 additions and 23 deletions
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34
middleware/kubernetes/kubernetes.go
View File

@@ -225,7 +225,10 @@ func (k *Kubernetes) parseRequest(lowerCasedName, qtype string) (r recordRequest
}
offset := 0
if len(segs) == 5 {
if qtype == "SRV" {
if len(segs) != 5 {
return r, errInvalidRequest
}
// This is a SRV style request, get first two elements as port and
// protocol, stripping leading underscores if present.
if segs[0][0] == '_' {
@@ -233,40 +236,31 @@ func (k *Kubernetes) parseRequest(lowerCasedName, qtype string) (r recordRequest
} else {
r.port = segs[0]
if !symbolContainsWildcard(r.port) {
return r, errors.New("srv port must start with an underscore or be a wildcard")
return r, errInvalidRequest
}
}
if segs[1][0] == '_' {
r.protocol = segs[1][1:]
if r.protocol != "tcp" && r.protocol != "udp" {
return r, errors.New("invalid srv protocol: " + r.protocol)
return r, errInvalidRequest
}
} else {
r.protocol = segs[1]
if !symbolContainsWildcard(r.protocol) {
return r, errors.New("srv protocol must start with an underscore or be a wildcard")
return r, errInvalidRequest
}
}
if r.port == "" || r.protocol == "" {
return r, errInvalidRequest
}
offset = 2
} else if len(segs) == 4 {
// This is an endpoint A style request. Get first element as endpoint.
}
if qtype == "A" && len(segs) == 4 {
// This is an endpoint A record request. Get first element as endpoint.
r.endpoint = segs[0]
offset = 1
}
// SRV requests require a port and protocol
if qtype == "SRV" {
if r.port == "" || r.protocol == "" {
return r, errors.New("invalid srv request")
}
}
// A requests cannot have port/protocol
if qtype == "A" {
if r.port != "" && r.protocol != "" {
return r, errors.New("invalid a request")
}
}
if len(segs) == (offset + 3) {
r.service = segs[offset]
r.namespace = segs[offset+1]
@@ -280,7 +274,7 @@ func (k *Kubernetes) parseRequest(lowerCasedName, qtype string) (r recordRequest
return r, nil
}
return r, errors.New("invalid request")
return r, errInvalidRequest
}

6
test/kubernetes_test.go
View File

@@ -181,17 +181,17 @@ var dnsTestCases = []test.Case{
},
{
Qname: "*.svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeServerFailure,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "*._not-udp-or-tcp.svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeServerFailure,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{
Qname: "svc-1-a.test-1.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeServerFailure,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
{