feat: update bootstrap_dns_android

transport/internet/system_dialer.go

@@ -68,7 +68,6 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 
 	dialer := &net.Dialer{
 		Timeout:   time.Second * 16,
-		DualStack: true,
 		LocalAddr: resolveSrcAddr(dest.Network, src),
 	}
 

transport/internet/system_dns_android.go

@@ -0,0 +1,26 @@
+// +build android
+
+package internet
+
+import (
+	"context"
+	"net"
+)
+
+const SystemDNS = "8.8.8.8:53"
+
+type DNSResolverFunc func() *net.Resolver
+
+var NewDNSResolver DNSResolverFunc = func() *net.Resolver {
+	return &net.Resolver{
+		PreferGo: true,
+		Dial: func(ctx context.Context, network, _ string) (net.Conn, error) {
+			var dialer net.Dialer
+			return dialer.DialContext(ctx, network, SystemDNS)
+		},
+	}
+}
+
+func init() {
+	net.DefaultResolver = NewDNSResolver()
+}

transport/internet/system_dns_android_test.go

@@ -0,0 +1,15 @@
+// +build android
+
+package internet
+
+import (
+	"context"
+	"testing"
+)
+
+func TestDNSResolver(t *testing.T) {
+	resolver := NewDNSResolver()
+	if ips, err := resolver.LookupIP(context.Background(), "ip", "www.google.com"); err != nil {
+		t.Errorf("failed to lookupIP, %v, %v", ips, err)
+	}
+}