Add resolver for outbound dialer

dns/client_test.go

@@ -0,0 +1,46 @@
+package dns_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/dns"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/net/dns/dnsmessage"
+)
+
+func TestClient(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	client := dns.NewClient(option.DNSClientOptions{})
+	dnsTransport := dns.NewTCPTransport(context.Background(), N.SystemDialer, log.NewNopLogger(), M.ParseSocksaddr("1.0.0.1:53"))
+	response, err := client.Exchange(ctx, dnsTransport, makeQuery())
+	require.NoError(t, err)
+	require.NotEmpty(t, response.Answers, "no answers")
+	response, err = client.Exchange(ctx, dnsTransport, makeQuery())
+	require.NoError(t, err)
+	require.NotEmpty(t, response.Answers, "no answers")
+	addresses, err := client.Lookup(ctx, dnsTransport, "www.google.com", C.DomainStrategyAsIS)
+	require.NoError(t, err)
+	require.NotEmpty(t, addresses, "no answers")
+	cancel()
+}
+
+func makeQuery() *dnsmessage.Message {
+	message := &dnsmessage.Message{}
+	message.Header.ID = 1
+	message.Header.RecursionDesired = true
+	message.Questions = append(message.Questions, dnsmessage.Question{
+		Name:  dnsmessage.MustNewName("google.com."),
+		Type:  dnsmessage.TypeA,
+		Class: dnsmessage.ClassINET,
+	})
+	return message
+}