8e5d0a23fa
* Add EDNS0_SUBNET rewrite * Fix review comments * Update comment * Fix according to review comments * Add ResponseWriter6 instead of parameterized the existing ResponseWriter
532 lines
16 KiB
Go
532 lines
16 KiB
Go
package rewrite
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import (
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"bytes"
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"reflect"
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"testing"
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"github.com/coredns/coredns/middleware"
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"github.com/coredns/coredns/middleware/pkg/dnsrecorder"
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"github.com/coredns/coredns/middleware/test"
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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)
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func msgPrinter(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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w.WriteMsg(r)
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return 0, nil
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}
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func TestNewRule(t *testing.T) {
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tests := []struct {
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args []string
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shouldError bool
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expType reflect.Type
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}{
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{[]string{}, true, nil},
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{[]string{"foo"}, true, nil},
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{[]string{"name"}, true, nil},
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{[]string{"name", "a.com"}, true, nil},
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{[]string{"name", "a.com", "b.com", "c.com"}, true, nil},
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{[]string{"name", "a.com", "b.com"}, false, reflect.TypeOf(&nameRule{})},
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{[]string{"type"}, true, nil},
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{[]string{"type", "a"}, true, nil},
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{[]string{"type", "any", "a", "a"}, true, nil},
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{[]string{"type", "any", "a"}, false, reflect.TypeOf(&typeRule{})},
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{[]string{"type", "XY", "WV"}, true, nil},
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{[]string{"type", "ANY", "WV"}, true, nil},
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{[]string{"class"}, true, nil},
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{[]string{"class", "IN"}, true, nil},
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{[]string{"class", "ch", "in", "in"}, true, nil},
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{[]string{"class", "ch", "in"}, false, reflect.TypeOf(&classRule{})},
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{[]string{"class", "XY", "WV"}, true, nil},
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{[]string{"class", "IN", "WV"}, true, nil},
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{[]string{"edns0"}, true, nil},
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{[]string{"edns0", "local"}, true, nil},
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{[]string{"edns0", "local", "set"}, true, nil},
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{[]string{"edns0", "local", "set", "0xffee"}, true, nil},
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{[]string{"edns0", "local", "set", "65518", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "abcdefg"}, false, reflect.TypeOf(&edns0LocalRule{})},
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{[]string{"edns0", "local", "foo", "0xffee", "abcdefg"}, true, nil},
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{[]string{"edns0", "local", "set", "0xffee", "0xabcdefg"}, true, nil},
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{[]string{"edns0", "nsid", "set", "junk"}, true, nil},
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{[]string{"edns0", "nsid", "set"}, false, reflect.TypeOf(&edns0NsidRule{})},
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{[]string{"edns0", "nsid", "append"}, false, reflect.TypeOf(&edns0NsidRule{})},
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{[]string{"edns0", "nsid", "replace"}, false, reflect.TypeOf(&edns0NsidRule{})},
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{[]string{"edns0", "nsid", "foo"}, true, nil},
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{[]string{"edns0", "local", "set", "0xffee", "{dummy}"}, true, nil},
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{[]string{"edns0", "local", "set", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "set", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{dummy}"}, true, nil},
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{[]string{"edns0", "local", "append", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "append", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{dummy}"}, true, nil},
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{[]string{"edns0", "local", "replace", "0xffee", "{qname}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{qtype}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{client_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{client_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{protocol}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{server_ip}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "local", "replace", "0xffee", "{server_port}"}, false, reflect.TypeOf(&edns0VariableRule{})},
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{[]string{"edns0", "subnet", "set", "-1", "56"}, true, nil},
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{[]string{"edns0", "subnet", "set", "24", "-56"}, true, nil},
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{[]string{"edns0", "subnet", "set", "33", "56"}, true, nil},
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{[]string{"edns0", "subnet", "set", "24", "129"}, true, nil},
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{[]string{"edns0", "subnet", "set", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
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{[]string{"edns0", "subnet", "append", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
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{[]string{"edns0", "subnet", "replace", "24", "56"}, false, reflect.TypeOf(&edns0SubnetRule{})},
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}
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for i, tc := range tests {
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r, err := newRule(tc.args...)
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if err == nil && tc.shouldError {
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t.Errorf("Test %d: expected error but got success", i)
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} else if err != nil && !tc.shouldError {
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t.Errorf("Test %d: expected success but got error: %s", i, err)
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}
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if !tc.shouldError && reflect.TypeOf(r) != tc.expType {
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t.Errorf("Test %d: expected %q but got %q", i, tc.expType, r)
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}
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}
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}
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func TestRewrite(t *testing.T) {
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rules := []Rule{}
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r, _ := newNameRule("from.nl.", "to.nl.")
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rules = append(rules, r)
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r, _ = newClassRule("CH", "IN")
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rules = append(rules, r)
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r, _ = newTypeRule("ANY", "HINFO")
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rules = append(rules, r)
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rw := Rewrite{
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Next: middleware.HandlerFunc(msgPrinter),
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Rules: rules,
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noRevert: true,
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}
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tests := []struct {
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from string
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fromT uint16
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fromC uint16
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to string
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toT uint16
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toC uint16
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}{
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{"from.nl.", dns.TypeA, dns.ClassINET, "to.nl.", dns.TypeA, dns.ClassINET},
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{"a.nl.", dns.TypeA, dns.ClassINET, "a.nl.", dns.TypeA, dns.ClassINET},
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{"a.nl.", dns.TypeA, dns.ClassCHAOS, "a.nl.", dns.TypeA, dns.ClassINET},
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{"a.nl.", dns.TypeANY, dns.ClassINET, "a.nl.", dns.TypeHINFO, dns.ClassINET},
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// name is rewritten, type is not.
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{"from.nl.", dns.TypeANY, dns.ClassINET, "to.nl.", dns.TypeANY, dns.ClassINET},
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// name is not, type is, but class is, because class is the 2nd rule.
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{"a.nl.", dns.TypeANY, dns.ClassCHAOS, "a.nl.", dns.TypeANY, dns.ClassINET},
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}
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ctx := context.TODO()
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for i, tc := range tests {
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m := new(dns.Msg)
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m.SetQuestion(tc.from, tc.fromT)
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m.Question[0].Qclass = tc.fromC
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rec := dnsrecorder.New(&test.ResponseWriter{})
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rw.ServeDNS(ctx, rec, m)
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resp := rec.Msg
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if resp.Question[0].Name != tc.to {
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t.Errorf("Test %d: Expected Name to be %q but was %q", i, tc.to, resp.Question[0].Name)
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}
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if resp.Question[0].Qtype != tc.toT {
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t.Errorf("Test %d: Expected Type to be '%d' but was '%d'", i, tc.toT, resp.Question[0].Qtype)
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}
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if resp.Question[0].Qclass != tc.toC {
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t.Errorf("Test %d: Expected Class to be '%d' but was '%d'", i, tc.toC, resp.Question[0].Qclass)
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}
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}
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}
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func TestRewriteEDNS0Local(t *testing.T) {
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rw := Rewrite{
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Next: middleware.HandlerFunc(msgPrinter),
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noRevert: true,
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}
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tests := []struct {
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fromOpts []dns.EDNS0
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args []string
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toOpts []dns.EDNS0
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}{
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "0xabcdef"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0xab, 0xcd, 0xef}}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "append", "0xffee", "abcdefghijklmnop"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("abcdefghijklmnop")}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "replace", "0xffee", "abcdefghijklmnop"},
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[]dns.EDNS0{},
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},
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{
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[]dns.EDNS0{},
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[]string{"nsid", "set"},
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[]dns.EDNS0{&dns.EDNS0_NSID{Code: dns.EDNS0NSID, Nsid: ""}},
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},
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{
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[]dns.EDNS0{},
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[]string{"nsid", "append"},
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[]dns.EDNS0{&dns.EDNS0_NSID{Code: dns.EDNS0NSID, Nsid: ""}},
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},
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{
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[]dns.EDNS0{},
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[]string{"nsid", "replace"},
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[]dns.EDNS0{},
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},
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}
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ctx := context.TODO()
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for i, tc := range tests {
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m := new(dns.Msg)
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m.SetQuestion("example.com.", dns.TypeA)
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m.Question[0].Qclass = dns.ClassINET
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r, err := newEdns0Rule(tc.args...)
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if err != nil {
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t.Errorf("Error creating test rule: %s", err)
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continue
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}
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rw.Rules = []Rule{r}
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rec := dnsrecorder.New(&test.ResponseWriter{})
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rw.ServeDNS(ctx, rec, m)
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resp := rec.Msg
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o := resp.IsEdns0()
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if o == nil {
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t.Errorf("Test %d: EDNS0 options not set", i)
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continue
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}
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if !optsEqual(o.Option, tc.toOpts) {
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t.Errorf("Test %d: Expected %v but got %v", i, tc.toOpts, o)
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}
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}
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}
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func TestEdns0LocalMultiRule(t *testing.T) {
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rules := []Rule{}
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r, _ := newEdns0Rule("local", "replace", "0xffee", "abcdef")
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rules = append(rules, r)
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r, _ = newEdns0Rule("local", "set", "0xffee", "fedcba")
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rules = append(rules, r)
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rw := Rewrite{
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Next: middleware.HandlerFunc(msgPrinter),
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Rules: rules,
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noRevert: true,
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}
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tests := []struct {
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fromOpts []dns.EDNS0
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toOpts []dns.EDNS0
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}{
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{
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nil,
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("fedcba")}},
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},
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{
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("foobar")}},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("abcdef")}},
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},
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}
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ctx := context.TODO()
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for i, tc := range tests {
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m := new(dns.Msg)
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m.SetQuestion("example.com.", dns.TypeA)
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m.Question[0].Qclass = dns.ClassINET
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if tc.fromOpts != nil {
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o := m.IsEdns0()
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if o == nil {
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m.SetEdns0(4096, true)
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o = m.IsEdns0()
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}
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o.Option = append(o.Option, tc.fromOpts...)
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}
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rec := dnsrecorder.New(&test.ResponseWriter{})
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rw.ServeDNS(ctx, rec, m)
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resp := rec.Msg
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o := resp.IsEdns0()
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if o == nil {
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t.Errorf("Test %d: EDNS0 options not set", i)
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continue
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}
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if !optsEqual(o.Option, tc.toOpts) {
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t.Errorf("Test %d: Expected %v but got %v", i, tc.toOpts, o)
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}
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}
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}
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func optsEqual(a, b []dns.EDNS0) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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switch aa := a[i].(type) {
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case *dns.EDNS0_LOCAL:
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if bb, ok := b[i].(*dns.EDNS0_LOCAL); ok {
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if aa.Code != bb.Code {
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return false
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}
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if !bytes.Equal(aa.Data, bb.Data) {
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return false
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}
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} else {
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return false
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}
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case *dns.EDNS0_NSID:
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if bb, ok := b[i].(*dns.EDNS0_NSID); ok {
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if aa.Nsid != bb.Nsid {
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return false
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}
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} else {
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return false
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}
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case *dns.EDNS0_SUBNET:
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if bb, ok := b[i].(*dns.EDNS0_SUBNET); ok {
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if aa.Code != bb.Code {
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return false
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}
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if aa.Family != bb.Family {
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return false
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}
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if aa.SourceNetmask != bb.SourceNetmask {
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return false
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}
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if aa.SourceScope != bb.SourceScope {
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return false
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}
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if !bytes.Equal(aa.Address, bb.Address) {
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return false
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}
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if aa.DraftOption != bb.DraftOption {
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return false
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}
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} else {
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return false
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}
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default:
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return false
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}
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}
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return true
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}
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func TestRewriteEDNS0LocalVariable(t *testing.T) {
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rw := Rewrite{
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Next: middleware.HandlerFunc(msgPrinter),
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noRevert: true,
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}
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// test.ResponseWriter has the following values:
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// The remote will always be 10.240.0.1 and port 40212.
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// The local address is always 127.0.0.1 and port 53.
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tests := []struct {
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fromOpts []dns.EDNS0
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args []string
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toOpts []dns.EDNS0
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}{
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{qname}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("example.com.")}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{qtype}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x00, 0x01}}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{client_ip}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x0A, 0xF0, 0x00, 0x01}}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{client_port}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x9D, 0x14}}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{protocol}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte("udp")}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{server_ip}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x7F, 0x00, 0x00, 0x01}}},
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},
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{
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[]dns.EDNS0{},
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[]string{"local", "set", "0xffee", "{server_port}"},
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[]dns.EDNS0{&dns.EDNS0_LOCAL{Code: 0xffee, Data: []byte{0x00, 0x35}}},
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},
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}
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ctx := context.TODO()
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for i, tc := range tests {
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m := new(dns.Msg)
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m.SetQuestion("example.com.", dns.TypeA)
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m.Question[0].Qclass = dns.ClassINET
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r, err := newEdns0Rule(tc.args...)
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if err != nil {
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t.Errorf("Error creating test rule: %s", err)
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continue
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}
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rw.Rules = []Rule{r}
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rec := dnsrecorder.New(&test.ResponseWriter{})
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rw.ServeDNS(ctx, rec, m)
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resp := rec.Msg
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o := resp.IsEdns0()
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if o == nil {
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t.Errorf("Test %d: EDNS0 options not set", i)
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continue
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|
}
|
|
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: middleware.HandlerFunc(msgPrinter),
|
|
noRevert: true,
|
|
}
|
|
|
|
tests := []struct {
|
|
writer dns.ResponseWriter
|
|
fromOpts []dns.EDNS0
|
|
args []string
|
|
toOpts []dns.EDNS0
|
|
}{
|
|
{
|
|
&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},
|
|
DraftOption: false}},
|
|
},
|
|
{
|
|
&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},
|
|
DraftOption: 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},
|
|
DraftOption: 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},
|
|
DraftOption: false}},
|
|
},
|
|
{
|
|
&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},
|
|
DraftOption: 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},
|
|
DraftOption: false}},
|
|
},
|
|
}
|
|
|
|
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(tc.writer)
|
|
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)
|
|
}
|
|
}
|
|
}
|