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coredns/plugin/rewrite/rewrite_test.go
Chris O'Haver b56b080a7c
plugin/view: Advanced routing interface and new 'view' plugin (#5538) 
* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block.
* add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block.

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
2022-09-08 14:56:27 -04:00

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package rewrite
import (
"bytes"
"context"
"fmt"
"reflect"
"testing"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/metadata"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
func msgPrinter(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
if len(r.Answer) == 0 {
r.Answer = []dns.RR{
test.A(fmt.Sprintf("%s 5 IN A 10.0.0.1", r.Question[0].Name)),
}
}
w.WriteMsg(r)
return 0, nil
}
func TestNewRule(t *testing.T) {
tests := []struct {
args []string
shouldError bool
expType reflect.Type
}{
{[]string{}, true, nil},
{[]string{"foo"}, true, nil},
{[]string{"name"}, true, nil},
{[]string{"name", "a.com"}, true, nil},
{[]string{"name", "a.com", "b.com", "c.com"}, true, nil},
{[]string{"name", "a.com", "b.com"}, false, reflect.TypeOf(&exactNameRule{})},
{[]string{"name", "exact", "a.com", "b.com"}, false, reflect.TypeOf(&exactNameRule{})},
{[]string{"name", "prefix", "a.com", "b.com"}, false, reflect.TypeOf(&prefixNameRule{})},
{[]string{"name", "suffix", "a.com", "b.com"}, false, reflect.TypeOf(&suffixNameRule{})},
{[]string{"name", "substring", "a.com", "b.com"}, false, reflect.TypeOf(&substringNameRule{})},
{[]string{"name", "regex", "([a])\\.com", "new-{1}.com"}, false, reflect.TypeOf(&regexNameRule{})},
{[]string{"name", "regex", "([a]\\.com", "new-{1}.com"}, true, nil},
{[]string{"name", "regex", "(dns)\\.(core)\\.(rocks)", "{2}.{1}.{3}", "answer", "name", "(core)\\.(dns)\\.(rocks)", "{2}.{1}.{3}"}, false, reflect.TypeOf(&regexNameRule{})},
{[]string{"name", "regex", "(adns)\\.(core)\\.(rocks)", "{2}.{1}.{3}", "answer", "name", "(core)\\.(adns)\\.(rocks)", "{2}.{1}.{3}", "too.long", "way.too.long"}, true, nil},
{[]string{"name", "regex", "(bdns)\\.(core)\\.(rocks)", "{2}.{1}.{3}", "NoAnswer", "name", "(core)\\.(bdns)\\.(rocks)", "{2}.{1}.{3}"}, true, nil},
{[]string{"name", "regex", "(cdns)\\.(core)\\.(rocks)", "{2}.{1}.{3}", "answer", "ttl", "(core)\\.(cdns)\\.(rocks)", "{2}.{1}.{3}"}, true, nil},
{[]string{"name", "regex", "(ddns)\\.(core)\\.(rocks)", "{2}.{1}.{3}", "answer", "name", "\xecore\\.(ddns)\\.(rocks)", "{2}.{1}.{3}"}, true, nil},
{[]string{"name", "regex", "\xedns\\.(core)\\.(rocks)", "{2}.{1}.{3}", "answer", "name", "(core)\\.(edns)\\.(rocks)", "{2}.{1}.{3}"}, true, nil},
{[]string{"name", "substring", "fcore.dns.rocks", "dns.fcore.rocks", "answer", "name", "(fcore)\\.(dns)\\.(rocks)", "{2}.{1}.{3}"}, false, reflect.TypeOf(&substringNameRule{})},
{[]string{"name", "substring", "a.com", "b.com", "c.com"}, true, nil},
{[]string{"type"}, true, nil},
{[]string{"type", "a"}, true, nil},
{[]string{"type", "any", "a", "a"}, true, nil},
{[]string{"type", "any", "a"}, false, reflect.TypeOf(&typeRule{})},
{[]string{"type", "XY", "WV"}, true, nil},
{[]string{"type", "ANY", "WV"}, true, nil},
{[]string{"class"}, true, nil},
{[]string{"class", "IN"}, true, nil},
{[]string{"class", "ch", "in", "in"}, true, nil},
{[]string{"class", "ch", "in"}, false, reflect.TypeOf(&classRule{})},
{[]string{"class", "XY", "WV"}, true, nil},
{[]string{"class", "IN", "WV"}, true, nil},
{[]string{"edns0"}, true, nil},
{[]string{"edns0", "local"}, true, nil},
{[]string{"edns0", "local", "set"}, true, nil},
{[]string{"edns0", "local", "set", "0xffee"}, true, nil},
{[]string{"edns0", "local", "set", "65518", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
{[]string{"edns0", "local", "set", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
{[]string{"edns0", "local", "append", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
{[]string{"edns0", "local", "foo", "0xffee", "abcdefg"}, true, nil},
{[]string{"edns0", "local", "set", "0xffee", "0xabcdefg"}, true, nil},
{[]string{"edns0", "nsid", "set", "junk"}, true, nil},
{[]string{"edns0", "nsid", "set"}, false, reflect.TypeOf(&edns0NsidRule{})},
{[]string{"edns0", "nsid", "append"}, false, reflect.TypeOf(&edns0NsidRule{})},
{[]string{"edns0", "nsid", "replace"}, false, reflect.TypeOf(&edns0NsidRule{})},
{[]string{"edns0", "nsid", "foo"}, true, nil},
{[]string{"edns0", "local", "set", "0xffee", "{dummy}"}, true, nil},
{[]string{"edns0", "local", "set", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "set", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "set", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "set", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "set", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "set", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "set", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{dummy}"}, true, nil},
{[]string{"edns0", "local", "append", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "append", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{dummy}"}, true, nil},
{[]string{"edns0", "local", "replace", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "local", "replace", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"edns0", "subnet", "set", "-1", "56"}, true, nil},
{[]string{"edns0", "subnet", "set", "24", "-56"}, true, nil},
{[]string{"edns0", "subnet", "set", "33", "56"}, true, nil},
{[]string{"edns0", "subnet", "set", "24", "129"}, true, nil},
{[]string{"edns0", "subnet", "set", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"edns0", "subnet", "append", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"edns0", "subnet", "replace", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"unknown-action", "name", "a.com", "b.com"}, true, nil},
{[]string{"stop", "name", "a.com", "b.com"}, false, reflect.TypeOf(&exactNameRule{})},
{[]string{"continue", "name", "a.com", "b.com"}, false, reflect.TypeOf(&exactNameRule{})},
{[]string{"unknown-action", "type", "any", "a"}, true, nil},
{[]string{"stop", "type", "any", "a"}, false, reflect.TypeOf(&typeRule{})},
{[]string{"continue", "type", "any", "a"}, false, reflect.TypeOf(&typeRule{})},
{[]string{"unknown-action", "class", "ch", "in"}, true, nil},
{[]string{"stop", "class", "ch", "in"}, false, reflect.TypeOf(&classRule{})},
{[]string{"continue", "class", "ch", "in"}, false, reflect.TypeOf(&classRule{})},
{[]string{"unknown-action", "edns0", "local", "set", "0xffee", "abcedef"}, true, nil},
{[]string{"stop", "edns0", "local", "set", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
{[]string{"unknown-action", "edns0", "nsid", "set"}, true, nil},
{[]string{"stop", "edns0", "nsid", "set"}, false, reflect.TypeOf(&edns0NsidRule{})},
{[]string{"continue", "edns0", "nsid", "set"}, false, reflect.TypeOf(&edns0NsidRule{})},
{[]string{"unknown-action", "edns0", "local", "set", "0xffee", "{qname}"}, true, nil},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"stop", "edns0", "local", "set", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"continue", "edns0", "local", "set", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
{[]string{"unknown-action", "edns0", "subnet", "set", "24", "64"}, true, nil},
{[]string{"stop", "edns0", "subnet", "set", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"stop", "edns0", "subnet", "append", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"stop", "edns0", "subnet", "replace", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"continue", "edns0", "subnet", "set", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"continue", "edns0", "subnet", "append", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
{[]string{"continue", "edns0", "subnet", "replace", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
}
for i, tc := range tests {
r, err := newRule(tc.args...)
if err == nil && tc.shouldError {
t.Errorf("Test %d: expected error but got success", i)
} else if err != nil && !tc.shouldError {
t.Errorf("Test %d: expected success but got error: %s", i, err)
}
if !tc.shouldError && reflect.TypeOf(r) != tc.expType {
t.Errorf("Test %d: expected %q but got %q", i, tc.expType, r)
}
}
}
func TestRewriteDefaultRevertPolicy(t *testing.T) {
rules := []Rule{}
r, _ := newNameRule("stop", "prefix", "prefix", "to")
rules = append(rules, r)
r, _ = newNameRule("stop", "suffix", ".suffix.", ".nl.")
rules = append(rules, r)
r, _ = newNameRule("stop", "substring", "from.substring", "to")
rules = append(rules, r)
r, _ = newNameRule("stop", "regex", "(f.*m)\\.regex\\.(nl)", "to.{2}")
rules = append(rules, r)
rw := Rewrite{
Next: plugin.HandlerFunc(msgPrinter),
Rules: rules,
// use production (default) RevertPolicy
}
tests := []struct {
from string
fromT uint16
fromC uint16
to string
toT uint16
toC uint16
}{
{"prefix.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"to.suffix.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"from.substring.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"from.regex.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
}
ctx := context.TODO()
for i, tc := range tests {
m := new(dns.Msg)
m.SetQuestion(tc.from, tc.fromT)
m.Question[0].Qclass = tc.fromC
rec := dnstest.NewRecorder(&test.ResponseWriter{})
rw.ServeDNS(ctx, rec, m)
resp := rec.Msg
if resp.Question[0].Name != tc.from {
t.Errorf("Test %d: Expected Name in Question to be %q but was %q", i, tc.from, resp.Question[0].Name)
}
if resp.Answer[0].Header().Name != tc.to {
t.Errorf("Test %d: Expected Name in Answer to be %q but was %q", i, tc.to, resp.Answer[0].Header().Name)
}
}
}
func TestRewrite(t *testing.T) {
rules := []Rule{}
r, _ := newNameRule("stop", "from.nl.", "to.nl.")
rules = append(rules, r)
r, _ = newNameRule("stop", "regex", "(core)\\.(dns)\\.(rocks)\\.(nl)", "{2}.{1}.{3}.{4}", "answer", "name", "(dns)\\.(core)\\.(rocks)\\.(nl)", "{2}.{1}.{3}.{4}")
rules = append(rules, r)
r, _ = newNameRule("stop", "exact", "from.exact.nl.", "to.nl.")
rules = append(rules, r)
r, _ = newNameRule("stop", "prefix", "prefix", "to")
rules = append(rules, r)
r, _ = newNameRule("stop", "suffix", ".suffix.", ".nl.")
rules = append(rules, r)
r, _ = newNameRule("stop", "substring", "from.substring", "to")
rules = append(rules, r)
r, _ = newNameRule("stop", "regex", "(f.*m)\\.regex\\.(nl)", "to.{2}")
rules = append(rules, r)
r, _ = newNameRule("continue", "regex", "consul\\.(rocks)", "core.dns.{1}")
rules = append(rules, r)
r, _ = newNameRule("stop", "core.dns.rocks", "to.nl.")
rules = append(rules, r)
r, _ = newClassRule("continue", "HS", "CH")
rules = append(rules, r)
r, _ = newClassRule("stop", "CH", "IN")
rules = append(rules, r)
r, _ = newTypeRule("stop", "ANY", "HINFO")
rules = append(rules, r)
rw := Rewrite{
Next: plugin.HandlerFunc(msgPrinter),
Rules: rules,
RevertPolicy: NoRevertPolicy(),
}
tests := []struct {
from string
fromT uint16
fromC uint16
to string
toT uint16
toC uint16
}{
{"from.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"a.nl.", dns.TypeA, dns.ClassINET, "a.nl.", dns.TypeA, dns.ClassINET},
{"a.nl.", dns.TypeA, dns.ClassCHAOS, "a.nl.", dns.TypeA, dns.ClassINET},
{"a.nl.", dns.TypeANY, dns.ClassINET, "a.nl.", dns.TypeHINFO, dns.ClassINET},
// name is rewritten, type is not.
{"from.nl.", dns.TypeANY, dns.ClassINET, "to.nl.", dns.TypeANY, dns.ClassINET},
{"from.exact.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"prefix.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"to.suffix.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"from.substring.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"from.regex.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
{"consul.rocks.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
// name is not, type is, but class is, because class is the 2nd rule.
{"a.nl.", dns.TypeANY, dns.ClassCHAOS, "a.nl.", dns.TypeANY, dns.ClassINET},
// class gets rewritten twice because of continue/stop logic: HS to CH, CH to IN
{"a.nl.", dns.TypeANY, 4, "a.nl.", dns.TypeANY, dns.ClassINET},
{"core.dns.rocks.nl.", dns.TypeA, dns.ClassINET, "dns.core.rocks.nl.", dns.TypeA, dns.ClassINET},
}
ctx := context.TODO()
for i, tc := range tests {
m := new(dns.Msg)
m.SetQuestion(tc.from, tc.fromT)
m.Question[0].Qclass = tc.fromC
rec := dnstest.NewRecorder(&test.ResponseWriter{})
rw.ServeDNS(ctx, rec, m)
resp := rec.Msg
if resp.Question[0].Name != tc.to {
t.Errorf("Test %d: Expected Name to be %q but was %q", i, tc.to, resp.Question[0].Name)
}
if resp.Question[0].Qtype != tc.toT {
t.Errorf("Test %d: Expected Type to be '%d' but was '%d'", i, tc.toT, resp.Question[0].Qtype)
}
if resp.Question[0].Qclass != tc.toC {
t.Errorf("Test %d: Expected Class to be '%d' but was '%d'", i, tc.toC, resp.Question[0].Qclass)
}
if tc.fromT == dns.TypeA && tc.toT == dns.TypeA {
if len(resp.Answer) > 0 {
if resp.Answer[0].(*dns.A).Hdr.Name != tc.to {
t.Errorf("Test %d: Expected Answer Name to be %q but was %q", i, tc.to, resp.Answer[0].(*dns.A).Hdr.Name)
}
}
}
}
}
func TestRewriteEDNS0Local(t *testing.T) {
rw := Rewrite{
Next: plugin.HandlerFunc(msgPrinter),
RevertPolicy: NoRevertPolicy(),
}
tests := []struct {
fromOpts []dns.EDNS0
args []string
toOpts []dns.EDNS0
doBool bool
}{
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "0xabcdef"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0xab, 0xcd, 0xef}}},
false,
},
{
[]dns.EDNS0{},
[]string{"local", "append", "0xffee", "abcdefghijklmnop"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("abcdefghijklmnop")}},
false,
},
{
[]dns.EDNS0{},
[]string{"local", "replace", "0xffee", "abcdefghijklmnop"},
[]dns.EDNS0{},
true,
},
{
[]dns.EDNS0{},
[]string{"nsid", "set"},
[]dns.EDNS0{&dns.EDNS0_NSID{Code: dns.EDNS0NSID, Nsid: ""}},
false,
},
{
[]dns.EDNS0{},
[]string{"nsid", "append"},
[]dns.EDNS0{&dns.EDNS0_NSID{Code: dns.EDNS0NSID, Nsid: ""}},
true,
},
{
[]dns.EDNS0{},
[]string{"nsid", "replace"},
[]dns.EDNS0{},
true,
},
}
ctx := context.TODO()
for i, tc := range tests {
m := new(dns.Msg)
m.SetQuestion("example.com.", dns.TypeA)
m.Question[0].Qclass = dns.ClassINET
r, err := newEdns0Rule("stop", tc.args...)
if err != nil {
t.Errorf("Error creating test rule: %s", err)
continue
}
rw.Rules = []Rule{r}
rec := dnstest.NewRecorder(&test.ResponseWriter{})
rw.ServeDNS(ctx, rec, m)
resp := rec.Msg
o := resp.IsEdns0()
o.SetDo(tc.doBool)
if o == nil {
t.Errorf("Test %d: EDNS0 options not set", i)
continue
}
if o.Do() != tc.doBool {
t.Errorf("Test %d: Expected %v but got %v", i, tc.doBool, o.Do())
}
if !optsEqual(o.Option, tc.toOpts) {
t.Errorf("Test %d: Expected %v but got %v", i, tc.toOpts, o)
}
}
}
func TestEdns0LocalMultiRule(t *testing.T) {
rules := []Rule{}
r, _ := newEdns0Rule("stop", "local", "replace", "0xffee", "abcdef")
rules = append(rules, r)
r, _ = newEdns0Rule("stop", "local", "set", "0xffee", "fedcba")
rules = append(rules, r)
rw := Rewrite{
Next: plugin.HandlerFunc(msgPrinter),
Rules: rules,
RevertPolicy: NoRevertPolicy(),
}
tests := []struct {
fromOpts []dns.EDNS0
toOpts []dns.EDNS0
}{
{
nil,
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("fedcba")}},
},
{
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("foobar")}},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("abcdef")}},
},
}
ctx := context.TODO()
for i, tc := range tests {
m := new(dns.Msg)
m.SetQuestion("example.com.", dns.TypeA)
m.Question[0].Qclass = dns.ClassINET
if tc.fromOpts != nil {
o := m.IsEdns0()
if o == nil {
m.SetEdns0(4096, true)
o = m.IsEdns0()
}
o.Option = append(o.Option, tc.fromOpts...)
}
rec := dnstest.NewRecorder(&test.ResponseWriter{})
rw.ServeDNS(ctx, rec, m)
resp := rec.Msg
o := resp.IsEdns0()
if o == nil {
t.Errorf("Test %d: EDNS0 options not set", i)
continue
}
if !optsEqual(o.Option, tc.toOpts) {
t.Errorf("Test %d: Expected %v but got %v", i, tc.toOpts, o)
}
}
}
func optsEqual(a, b []dns.EDNS0) bool {
if len(a) != len(b) {
return false
}
for i := range a {
switch aa := a[i].(type) {
case *dns.EDNS0_LOCAL:
if bb, ok := b[i].(*dns.EDNS0_LOCAL); ok {
if aa.Code != bb.Code {
return false
}
if !bytes.Equal(aa.Data, bb.Data) {
return false
}
} else {
return false
}
case *dns.EDNS0_NSID:
if bb, ok := b[i].(*dns.EDNS0_NSID); ok {
if aa.Nsid != bb.Nsid {
return false
}
} else {
return false
}
case *dns.EDNS0_SUBNET:
if bb, ok := b[i].(*dns.EDNS0_SUBNET); ok {
if aa.Code != bb.Code {
return false
}
if aa.Family != bb.Family {
return false
}
if aa.SourceNetmask != bb.SourceNetmask {
return false
}
if aa.SourceScope != bb.SourceScope {
return false
}
if !aa.Address.Equal(bb.Address) {
return false
}
} else {
return false
}
default:
return false
}
}
return true
}
type testProvider map[string]metadata.Func
func (tp testProvider) Metadata(ctx context.Context, state request.Request) context.Context {
for k, v := range tp {
metadata.SetValueFunc(ctx, k, v)
}
return ctx
}
func TestRewriteEDNS0LocalVariable(t *testing.T) {
rw := Rewrite{
Next: plugin.HandlerFunc(msgPrinter),
RevertPolicy: NoRevertPolicy(),
}
expectedMetadata := []metadata.Provider{
testProvider{"test/label": func() string { return "my-value" }},
testProvider{"test/empty": func() string { return "" }},
}
meta := metadata.Metadata{
Zones: []string{"."},
Providers: expectedMetadata,
Next: &rw,
}
// test.ResponseWriter has the following values:
// The remote will always be 10.240.0.1 and port 40212.
// The local address is always 127.0.0.1 and port 53.
tests := []struct {
fromOpts []dns.EDNS0
args []string
toOpts []dns.EDNS0
doBool bool
}{
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{qname}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("example.com.")}},
true,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{qtype}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x00, 0x01}}},
false,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{client_ip}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x0A, 0xF0, 0x00, 0x01}}},
false,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{client_port}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x9D, 0x14}}},
true,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{protocol}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("udp")}},
false,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{server_port}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x00, 0x35}}},
true,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{server_ip}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x7F, 0x00, 0x00, 0x01}}},
true,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{test/label}"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("my-value")}},
true,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{test/empty}"},
nil,
false,
},
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "{test/does-not-exist}"},
nil,
false,
},
}
for i, tc := range tests {
m := new(dns.Msg)
m.SetQuestion("example.com.", dns.TypeA)
r, err := newEdns0Rule("stop", tc.args...)
if err != nil {
t.Errorf("Error creating test rule: %s", err)
continue
}
rw.Rules = []Rule{r}
rec := dnstest.NewRecorder(&test.ResponseWriter{})
ctx := meta.Collect(context.TODO(), request.Request{W: rec, Req: m})
meta.ServeDNS(ctx, rec, m)
resp := rec.Msg
o := resp.IsEdns0()
if o == nil {
if tc.toOpts != nil {
t.Errorf("Test %d: EDNS0 options not set", i)
}
continue
}
o.SetDo(tc.doBool)
if o.Do() != tc.doBool {
t.Errorf("Test %d: Expected %v but got %v", i, tc.doBool, o.Do())
}
if !optsEqual(o.Option, tc.toOpts) {
t.Errorf("Test %d: Expected %v but got %v", i, tc.toOpts, o)
}
}
}
func TestRewriteEDNS0Subnet(t *testing.T) {
rw := Rewrite{
Next: plugin.HandlerFunc(msgPrinter),
RevertPolicy: NoRevertPolicy(),
}
tests := []struct {
writer dns.ResponseWriter
fromOpts []dns.EDNS0
args []string
toOpts []dns.EDNS0
doBool bool
}{
{
&test.ResponseWriter{},
[]dns.EDNS0{},
[]string{"subnet", "set", "24", "56"},
[]dns.EDNS0{&dns.EDNS0_SUBNET{Code: 0x8,
Family: 0x1,
SourceNetmask: 0x18,
SourceScope: 0x0,
Address: []byte{0x0A, 0xF0, 0x00, 0x00},
}},
true,
},
{
&test.ResponseWriter{},
[]dns.EDNS0{},
[]string{"subnet", "set", "32", "56"},
[]dns.EDNS0{&dns.EDNS0_SUBNET{Code: 0x8,
Family: 0x1,
SourceNetmask: 0x20,
SourceScope: 0x0,
Address: []byte{0x0A, 0xF0, 0x00, 0x01},
}},
false,
},
{
&test.ResponseWriter{},
[]dns.EDNS0{},
[]string{"subnet", "set", "0", "56"},
[]dns.EDNS0{&dns.EDNS0_SUBNET{Code: 0x8,
Family: 0x1,
SourceNetmask: 0x0,
SourceScope: 0x0,
Address: []byte{0x00, 0x00, 0x00, 0x00},
}},
false,
},
{
&test.ResponseWriter6{},
[]dns.EDNS0{},
[]string{"subnet", "set", "24", "56"},
[]dns.EDNS0{&dns.EDNS0_SUBNET{Code: 0x8,
Family: 0x2,
SourceNetmask: 0x38,
SourceScope: 0x0,
Address: []byte{0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
}},
true,
},
{
&test.ResponseWriter6{},
[]dns.EDNS0{},
[]string{"subnet", "set", "24", "128"},
[]dns.EDNS0{&dns.EDNS0_SUBNET{Code: 0x8,
Family: 0x2,
SourceNetmask: 0x80,
SourceScope: 0x0,
Address: []byte{0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x42, 0x00, 0xff, 0xfe, 0xca, 0x4c, 0x65},
}},
false,
},
{
&test.ResponseWriter6{},
[]dns.EDNS0{},
[]string{"subnet", "set", "24", "0"},
[]dns.EDNS0{&dns.EDNS0_SUBNET{Code: 0x8,
Family: 0x2,
SourceNetmask: 0x0,
SourceScope: 0x0,
Address: []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
}},
true,
},
}
ctx := context.TODO()
for i, tc := range tests {
m := new(dns.Msg)
m.SetQuestion("example.com.", dns.TypeA)
r, err := newEdns0Rule("stop", tc.args...)
if err != nil {
t.Errorf("Error creating test rule: %s", err)
continue
}
rw.Rules = []Rule{r}
rec := dnstest.NewRecorder(tc.writer)
rw.ServeDNS(ctx, rec, m)
resp := rec.Msg
o := resp.IsEdns0()
o.SetDo(tc.doBool)
if o == nil {
t.Errorf("Test %d: EDNS0 options not set", i)
continue
}
if o.Do() != tc.doBool {
t.Errorf("Test %d: Expected %v but got %v", i, tc.doBool, o.Do())
}
if !optsEqual(o.Option, tc.toOpts) {
t.Errorf("Test %d: Expected %v but got %v", i, tc.toOpts, o)
}
}
}
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