129 lines
3.0 KiB
Go
129 lines
3.0 KiB
Go
package dns
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import (
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"context"
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"errors"
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"net"
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"testing"
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"github.com/hashicorp/go-hclog"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/require"
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"github.com/stretchr/testify/suite"
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"google.golang.org/grpc"
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"github.com/hashicorp/consul/agent/grpc-external/testutils"
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"github.com/hashicorp/consul/proto-public/pbdns"
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)
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var txtRR = []string{"Hello world"}
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func helloServer(w dns.ResponseWriter, req *dns.Msg) {
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m := new(dns.Msg)
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m.SetReply(req)
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m.Extra = make([]dns.RR, 1)
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m.Extra[0] = &dns.TXT{
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Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0},
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Txt: txtRR,
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}
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w.WriteMsg(m)
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}
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func testClient(t *testing.T, server *Server) pbdns.DNSServiceClient {
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t.Helper()
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addr := testutils.RunTestServer(t, server)
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//nolint:staticcheck
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conn, err := grpc.DialContext(context.Background(), addr.String(), grpc.WithInsecure())
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require.NoError(t, err)
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t.Cleanup(func() {
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require.NoError(t, conn.Close())
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})
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return pbdns.NewDNSServiceClient(conn)
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}
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type DNSTestSuite struct {
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suite.Suite
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}
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func TestDNS_suite(t *testing.T) {
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suite.Run(t, new(DNSTestSuite))
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}
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func (s *DNSTestSuite) TestProxy_Success() {
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mux := dns.NewServeMux()
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mux.Handle(".", dns.HandlerFunc(helloServer))
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server := NewServer(Config{
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Logger: hclog.Default(),
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DNSServeMux: mux,
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LocalAddr: LocalAddr{
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net.IPv4(127, 0, 0, 1),
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0,
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},
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})
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client := testClient(s.T(), server)
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testCases := map[string]struct {
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question string
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clientQuery func(qR *pbdns.QueryRequest)
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expectedErr error
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}{
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"happy path udp": {
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question: "abc.com.",
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clientQuery: func(qR *pbdns.QueryRequest) {
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qR.Protocol = pbdns.Protocol_PROTOCOL_UDP
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},
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},
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"happy path tcp": {
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question: "abc.com.",
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clientQuery: func(qR *pbdns.QueryRequest) {
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qR.Protocol = pbdns.Protocol_PROTOCOL_TCP
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},
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},
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"No protocol set": {
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question: "abc.com.",
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clientQuery: func(qR *pbdns.QueryRequest) {},
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expectedErr: errors.New("error protocol type not set: PROTOCOL_UNSET_UNSPECIFIED"),
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},
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"Invalid question": {
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question: "notvalid",
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clientQuery: func(qR *pbdns.QueryRequest) {
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qR.Protocol = pbdns.Protocol_PROTOCOL_UDP
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},
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expectedErr: errors.New("failure decoding dns request"),
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},
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}
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for name, tc := range testCases {
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s.Run(name, func() {
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req := dns.Msg{}
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req.SetQuestion(tc.question, dns.TypeA)
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bytes, _ := req.Pack()
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clientReq := &pbdns.QueryRequest{Msg: bytes}
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tc.clientQuery(clientReq)
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clientResp, err := client.Query(context.Background(), clientReq)
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if tc.expectedErr != nil {
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s.Require().Error(err, "no errror calling gRPC endpoint")
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s.Require().ErrorContains(err, tc.expectedErr.Error())
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} else {
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s.Require().NoError(err, "error calling gRPC endpoint")
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resp := clientResp.GetMsg()
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var dnsResp dns.Msg
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err = dnsResp.Unpack(resp)
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s.Require().NoError(err, "error unpacking dns response")
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rr := dnsResp.Extra[0].(*dns.TXT)
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s.Require().EqualValues(rr.Txt, txtRR)
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}
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})
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}
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}
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