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package rewrite
import (
"bytes"
"reflect"
"testing"
"github.com/coredns/coredns/middleware"
"github.com/coredns/coredns/middleware/pkg/dnsrecorder"
"github.com/coredns/coredns/middleware/test"
"github.com/miekg/dns"
"golang.org/x/net/context"
)
func msgPrinter(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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(&nameRule{})},
{[]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},
}
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 TestRewrite(t *testing.T) {
rules := []Rule{}
r, _ := newNameRule("from.nl.", "to.nl.")
rules = append(rules, r)
r, _ = newClassRule("CH", "IN")
rules = append(rules, r)
r, _ = newTypeRule("ANY", "HINFO")
rules = append(rules, r)
rw := Rewrite{
Next: middleware.HandlerFunc(msgPrinter),
Rules: rules,
noRevert: true,
}
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},
// 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},
}
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 := dnsrecorder.New(&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)
}
}
}
func TestRewriteEDNS0Local(t *testing.T) {
rw := Rewrite{
Next: middleware.HandlerFunc(msgPrinter),
noRevert: true,
}
tests := []struct {
fromOpts []dns.EDNS0
args []string
toOpts []dns.EDNS0
}{
{
[]dns.EDNS0{},
[]string{"local", "set", "0xffee", "0xabcdef"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0xab, 0xcd, 0xef}}},
},
{
[]dns.EDNS0{},
[]string{"local", "append", "0xffee", "abcdefghijklmnop"},
[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("abcdefghijklmnop")}},
},
{
[]dns.EDNS0{},
[]string{"local", "replace", "0xffee", "abcdefghijklmnop"},
[]dns.EDNS0{},
},
{
[]dns.EDNS0{},
[]string{"nsid", "set"},
[]dns.EDNS0{&dns.EDNS0_NSID{Code: dns.EDNS0NSID, Nsid: ""}},
},
{
[]dns.EDNS0{},
[]string{"nsid", "append"},
[]dns.EDNS0{&dns.EDNS0_NSID{Code: dns.EDNS0NSID, Nsid: ""}},
},
{
[]dns.EDNS0{},
[]string{"nsid", "replace"},
[]dns.EDNS0{},
},
}
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(tc.args...)
if err != nil {
t.Errorf("Error creating test rule: %s", err)
continue
}
rw.Rules = []Rule{r}
rec := dnsrecorder.New(&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 TestEdns0LocalMultiRule(t *testing.T) {
rules := []Rule{}
r, _ := newEdns0Rule("local", "replace", "0xffee", "abcdef")
rules = append(rules, r)
r, _ = newEdns0Rule("local", "set", "0xffee", "fedcba")
rules = append(rules, r)
rw := Rewrite{
Next: middleware.HandlerFunc(msgPrinter),
Rules: rules,
noRevert: true,
}
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 := dnsrecorder.New(&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
}
default:
return false
}
}
return true
}
|
