mirror of
https://github.com/coredns/coredns.git
synced 2025-11-03 10:43:20 -05:00
464 lines
16 KiB
Go
464 lines
16 KiB
Go
package template
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import (
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"context"
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"fmt"
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"regexp"
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"testing"
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gotmpl "text/template"
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"github.com/coredns/coredns/plugin/pkg/dnstest"
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"github.com/coredns/coredns/plugin/pkg/fall"
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"github.com/coredns/coredns/plugin/test"
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"github.com/mholt/caddy"
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"github.com/miekg/dns"
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)
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func TestHandler(t *testing.T) {
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exampleDomainATemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("(^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$")},
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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exampleDomainANSTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("(^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$")},
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"))},
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additional: []*gotmpl.Template{gotmpl.Must(gotmpl.New("additional").Parse("ns0.example. IN A 203.0.113.8"))},
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authority: []*gotmpl.Template{gotmpl.Must(gotmpl.New("authority").Parse("example. IN NS ns0.example.com."))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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exampleDomainMXTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("(^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$")},
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 MX 10 {{ .Name }}"))},
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additional: []*gotmpl.Template{gotmpl.Must(gotmpl.New("additional").Parse("{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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invalidDomainTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("[.]invalid[.]$")},
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rcode: dns.RcodeNameError,
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("invalid. 60 {{ .Class }} SOA a.invalid. b.invalid. (1 60 60 60 60)"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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rcodeServfailTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile(".*")},
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rcode: dns.RcodeServerFailure,
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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brokenTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 IN TXT \"{{ index .Match 2 }}\""))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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nonRRTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }}"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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nonRRAdditionalTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
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additional: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }}"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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nonRRAuthoritativeTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
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authority: []*gotmpl.Template{gotmpl.Must(gotmpl.New("authority").Parse("{{ .Name }}"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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cnameTemplate := template{
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regex: []*regexp.Regexp{regexp.MustCompile("example[.]net[.]")},
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answer: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("example.net 60 IN CNAME target.example.com"))},
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qclass: dns.ClassANY,
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qtype: dns.TypeANY,
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fall: fall.Root,
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zones: []string{"."},
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}
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tests := []struct {
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tmpl template
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qname string
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name string
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qclass uint16
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qtype uint16
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expectedCode int
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expectedErr string
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verifyResponse func(*dns.Msg) error
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}{
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{
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name: "RcodeServFail",
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tmpl: rcodeServfailTemplate,
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qname: "test.invalid.",
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expectedCode: dns.RcodeServerFailure,
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verifyResponse: func(r *dns.Msg) error {
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return nil
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},
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},
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{
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name: "ExampleDomainNameMismatch",
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tmpl: exampleDomainATemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeA,
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qname: "test.invalid.",
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expectedCode: rcodeFallthrough,
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},
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{
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name: "BrokenTemplate",
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tmpl: brokenTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeANY,
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qname: "test.example.",
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expectedCode: dns.RcodeServerFailure,
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expectedErr: `template: answer:1:26: executing "answer" at <index .Match 2>: error calling index: index out of range: 2`,
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verifyResponse: func(r *dns.Msg) error {
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return nil
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},
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},
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{
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name: "NonRRTemplate",
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tmpl: nonRRTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeANY,
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qname: "test.example.",
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expectedCode: dns.RcodeServerFailure,
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expectedErr: `dns: not a TTL: "test.example." at line: 1:13`,
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verifyResponse: func(r *dns.Msg) error {
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return nil
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},
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},
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{
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name: "NonRRAdditionalTemplate",
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tmpl: nonRRAdditionalTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeANY,
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qname: "test.example.",
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expectedCode: dns.RcodeServerFailure,
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expectedErr: `dns: not a TTL: "test.example." at line: 1:13`,
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verifyResponse: func(r *dns.Msg) error {
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return nil
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},
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},
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{
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name: "NonRRAuthorityTemplate",
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tmpl: nonRRAuthoritativeTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeANY,
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qname: "test.example.",
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expectedCode: dns.RcodeServerFailure,
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expectedErr: `dns: not a TTL: "test.example." at line: 1:13`,
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verifyResponse: func(r *dns.Msg) error {
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return nil
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},
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},
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{
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name: "ExampleDomainMatch",
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tmpl: exampleDomainATemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeA,
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qname: "ip-10-95-12-8.example.",
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verifyResponse: func(r *dns.Msg) error {
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if len(r.Answer) != 1 {
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return fmt.Errorf("expected 1 answer, got %v", len(r.Answer))
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}
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if r.Answer[0].Header().Rrtype != dns.TypeA {
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return fmt.Errorf("expected an A record answer, got %v", dns.TypeToString[r.Answer[0].Header().Rrtype])
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}
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if r.Answer[0].(*dns.A).A.String() != "10.95.12.8" {
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return fmt.Errorf("expected an A record for 10.95.12.8, got %v", r.Answer[0].String())
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}
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return nil
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},
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},
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{
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name: "ExampleDomainMXMatch",
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tmpl: exampleDomainMXTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeMX,
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qname: "ip-10-95-12-8.example.",
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verifyResponse: func(r *dns.Msg) error {
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if len(r.Answer) != 1 {
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return fmt.Errorf("expected 1 answer, got %v", len(r.Answer))
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}
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if r.Answer[0].Header().Rrtype != dns.TypeMX {
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return fmt.Errorf("expected an A record answer, got %v", dns.TypeToString[r.Answer[0].Header().Rrtype])
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}
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if len(r.Extra) != 1 {
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return fmt.Errorf("expected 1 extra record, got %v", len(r.Extra))
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}
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if r.Extra[0].Header().Rrtype != dns.TypeA {
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return fmt.Errorf("expected an additional A record, got %v", dns.TypeToString[r.Extra[0].Header().Rrtype])
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}
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return nil
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},
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},
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{
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name: "ExampleDomainANSMatch",
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tmpl: exampleDomainANSTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeA,
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qname: "ip-10-95-12-8.example.",
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verifyResponse: func(r *dns.Msg) error {
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if len(r.Answer) != 1 {
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return fmt.Errorf("expected 1 answer, got %v", len(r.Answer))
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}
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if r.Answer[0].Header().Rrtype != dns.TypeA {
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return fmt.Errorf("expected an A record answer, got %v", dns.TypeToString[r.Answer[0].Header().Rrtype])
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}
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if len(r.Extra) != 1 {
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return fmt.Errorf("expected 1 extra record, got %v", len(r.Extra))
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}
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if r.Extra[0].Header().Rrtype != dns.TypeA {
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return fmt.Errorf("expected an additional A record, got %v", dns.TypeToString[r.Extra[0].Header().Rrtype])
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}
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if len(r.Ns) != 1 {
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return fmt.Errorf("expected 1 authoritative record, got %v", len(r.Extra))
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}
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if r.Ns[0].Header().Rrtype != dns.TypeNS {
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return fmt.Errorf("expected an authoritative NS record, got %v", dns.TypeToString[r.Extra[0].Header().Rrtype])
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}
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return nil
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},
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},
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{
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name: "ExampleInvalidNXDOMAIN",
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tmpl: invalidDomainTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeMX,
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qname: "test.invalid.",
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expectedCode: dns.RcodeNameError,
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verifyResponse: func(r *dns.Msg) error {
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if len(r.Answer) != 1 {
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return fmt.Errorf("expected 1 answer, got %v", len(r.Answer))
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}
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if r.Answer[0].Header().Rrtype != dns.TypeSOA {
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return fmt.Errorf("expected an SOA record answer, got %v", dns.TypeToString[r.Answer[0].Header().Rrtype])
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}
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return nil
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},
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},
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{
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name: "CNAMEWithoutUpstream",
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tmpl: cnameTemplate,
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qclass: dns.ClassINET,
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qtype: dns.TypeA,
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qname: "example.net.",
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expectedCode: dns.RcodeSuccess,
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verifyResponse: func(r *dns.Msg) error {
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if len(r.Answer) != 1 {
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return fmt.Errorf("expected 1 answer, got %v", len(r.Answer))
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}
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return nil
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},
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},
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}
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ctx := context.TODO()
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for _, tr := range tests {
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handler := Handler{
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Next: test.NextHandler(rcodeFallthrough, nil),
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Zones: []string{"."},
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Templates: []template{tr.tmpl},
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}
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req := &dns.Msg{
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Question: []dns.Question{{
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Name: tr.qname,
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Qclass: tr.qclass,
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Qtype: tr.qtype,
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}},
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}
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rec := dnstest.NewRecorder(&test.ResponseWriter{})
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code, err := handler.ServeDNS(ctx, rec, req)
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if err == nil && tr.expectedErr != "" {
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t.Errorf("Test %v expected error: %v, got nothing", tr.name, tr.expectedErr)
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}
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if err != nil && tr.expectedErr == "" {
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t.Errorf("Test %v expected no error got: %v", tr.name, err)
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}
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if err != nil && tr.expectedErr != "" && err.Error() != tr.expectedErr {
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t.Errorf("Test %v expected error: %v, got: %v", tr.name, tr.expectedErr, err)
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}
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if code != tr.expectedCode {
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t.Errorf("Test %v expected response code %v, got %v", tr.name, tr.expectedCode, code)
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}
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if err == nil && code != rcodeFallthrough {
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// only verify if we got no error and expected no error
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if err := tr.verifyResponse(rec.Msg); err != nil {
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t.Errorf("Test %v could not verify the response: %v", tr.name, err)
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}
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}
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}
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}
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// TestMultiSection verfies that a corefile with multiple but different template sections works
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func TestMultiSection(t *testing.T) {
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ctx := context.TODO()
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multisectionConfig := `
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# Implicit section (see c.ServerBlockKeys)
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# test.:8053 {
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# REFUSE IN A for the server zone (test.)
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template IN A {
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rcode REFUSED
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}
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# Fallthrough everything IN TXT for test.
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template IN TXT {
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match "$^"
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rcode SERVFAIL
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fallthrough
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}
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# Answer CH TXT *.coredns.invalid. / coredns.invalid.
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template CH TXT coredns.invalid {
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answer "{{ .Name }} 60 CH TXT \"test\""
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}
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# Answer example. ip templates and fallthrough otherwise
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template IN A example {
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match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
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answer "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
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fallthrough
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}
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# Answer MX record requests for ip templates in example. and never fall through
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template IN MX example {
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match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
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answer "{{ .Name }} 60 IN MX 10 {{ .Name }}"
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additional "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
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}
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`
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c := caddy.NewTestController("dns", multisectionConfig)
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c.ServerBlockKeys = []string{"test.:8053"}
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handler, err := templateParse(c)
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if err != nil {
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t.Fatalf("TestMultiSection could not parse config: %v", err)
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}
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handler.Next = test.NextHandler(rcodeFallthrough, nil)
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rec := dnstest.NewRecorder(&test.ResponseWriter{})
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// Asking for test. IN A -> REFUSED
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req := &dns.Msg{Question: []dns.Question{{Name: "some.test.", Qclass: dns.ClassINET, Qtype: dns.TypeA}}}
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code, err := handler.ServeDNS(ctx, rec, req)
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if err != nil {
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t.Fatalf("TestMultiSection expected no error resolving some.test. A, got: %v", err)
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}
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if code != dns.RcodeRefused {
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t.Fatalf("TestMultiSection expected response code REFUSED got: %v", code)
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}
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// Asking for test. IN TXT -> fallthrough
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req = &dns.Msg{Question: []dns.Question{{Name: "some.test.", Qclass: dns.ClassINET, Qtype: dns.TypeTXT}}}
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code, err = handler.ServeDNS(ctx, rec, req)
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if err != nil {
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t.Fatalf("TestMultiSection expected no error resolving some.test. TXT, got: %v", err)
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}
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if code != rcodeFallthrough {
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t.Fatalf("TestMultiSection expected response code fallthrough got: %v", code)
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}
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// Asking for coredns.invalid. CH TXT -> TXT "test"
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req = &dns.Msg{Question: []dns.Question{{Name: "coredns.invalid.", Qclass: dns.ClassCHAOS, Qtype: dns.TypeTXT}}}
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code, err = handler.ServeDNS(ctx, rec, req)
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if err != nil {
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t.Fatalf("TestMultiSection expected no error resolving coredns.invalid. TXT, got: %v", err)
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}
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if code != dns.RcodeSuccess {
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t.Fatalf("TestMultiSection expected success response for coredns.invalid. TXT got: %v", code)
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}
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if len(rec.Msg.Answer) != 1 {
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t.Fatalf("TestMultiSection expected one answer for coredns.invalid. TXT got: %v", rec.Msg.Answer)
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}
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if rec.Msg.Answer[0].Header().Rrtype != dns.TypeTXT || rec.Msg.Answer[0].(*dns.TXT).Txt[0] != "test" {
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t.Fatalf("TestMultiSection a \"test\" answer for coredns.invalid. TXT got: %v", rec.Msg.Answer[0])
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}
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// Asking for an ip template in example
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req = &dns.Msg{Question: []dns.Question{{Name: "ip-10-11-12-13.example.", Qclass: dns.ClassINET, Qtype: dns.TypeA}}}
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code, err = handler.ServeDNS(ctx, rec, req)
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if err != nil {
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t.Fatalf("TestMultiSection expected no error resolving ip-10-11-12-13.example. IN A, got: %v", err)
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}
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if code != dns.RcodeSuccess {
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t.Fatalf("TestMultiSection expected success response ip-10-11-12-13.example. IN A got: %v, %v", code, dns.RcodeToString[code])
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}
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if len(rec.Msg.Answer) != 1 {
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t.Fatalf("TestMultiSection expected one answer for ip-10-11-12-13.example. IN A got: %v", rec.Msg.Answer)
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}
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if rec.Msg.Answer[0].Header().Rrtype != dns.TypeA {
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t.Fatalf("TestMultiSection an A RR answer for ip-10-11-12-13.example. IN A got: %v", rec.Msg.Answer[0])
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}
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// Asking for an MX ip template in example
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req = &dns.Msg{Question: []dns.Question{{Name: "ip-10-11-12-13.example.", Qclass: dns.ClassINET, Qtype: dns.TypeMX}}}
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code, err = handler.ServeDNS(ctx, rec, req)
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if err != nil {
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t.Fatalf("TestMultiSection expected no error resolving ip-10-11-12-13.example. IN MX, got: %v", err)
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}
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if code != dns.RcodeSuccess {
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t.Fatalf("TestMultiSection expected success response ip-10-11-12-13.example. IN MX got: %v, %v", code, dns.RcodeToString[code])
|
|
}
|
|
if len(rec.Msg.Answer) != 1 {
|
|
t.Fatalf("TestMultiSection expected one answer for ip-10-11-12-13.example. IN MX got: %v", rec.Msg.Answer)
|
|
}
|
|
if rec.Msg.Answer[0].Header().Rrtype != dns.TypeMX {
|
|
t.Fatalf("TestMultiSection an A RR answer for ip-10-11-12-13.example. IN MX got: %v", rec.Msg.Answer[0])
|
|
}
|
|
|
|
// Test that something.example. A does fall through but something.example. MX does not
|
|
|
|
req = &dns.Msg{Question: []dns.Question{{Name: "something.example.", Qclass: dns.ClassINET, Qtype: dns.TypeA}}}
|
|
code, err = handler.ServeDNS(ctx, rec, req)
|
|
if err != nil {
|
|
t.Fatalf("TestMultiSection expected no error resolving something.example. IN A, got: %v", err)
|
|
}
|
|
if code != rcodeFallthrough {
|
|
t.Fatalf("TestMultiSection expected a fall through resolving something.example. IN A, got: %v, %v", code, dns.RcodeToString[code])
|
|
}
|
|
|
|
req = &dns.Msg{Question: []dns.Question{{Name: "something.example.", Qclass: dns.ClassINET, Qtype: dns.TypeMX}}}
|
|
code, err = handler.ServeDNS(ctx, rec, req)
|
|
if err != nil {
|
|
t.Fatalf("TestMultiSection expected no error resolving something.example. IN MX, got: %v", err)
|
|
}
|
|
if code == rcodeFallthrough {
|
|
t.Fatalf("TestMultiSection expected no fall through resolving something.example. IN MX")
|
|
}
|
|
if code != dns.RcodeNameError {
|
|
t.Fatalf("TestMultiSection expected NXDOMAIN resolving something.example. IN MX, got %v, %v", code, dns.RcodeToString[code])
|
|
}
|
|
}
|
|
|
|
const rcodeFallthrough = 3841 // reserved for private use, used to indicate a fallthrough
|