feat: update bootstrap_dns_android

transport/internet/system_dialer.go

@@ -68,8 +68,8 @@ 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),
+		Resolver:  NewDNSResolver(),
 	}
 
 	if sockopt != nil || len(d.controllers) > 0 {

transport/internet/system_dns.go

@@ -0,0 +1,18 @@
+package internet
+
+import (
+	"context"
+	"net"
+)
+
+type DNSResolverFunc func() *net.Resolver
+
+var NewDNSResolver DNSResolverFunc = func() *net.Resolver {
+	return &net.Resolver{
+		PreferGo: true,
+		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			var dialer net.Dialer
+			return dialer.DialContext(ctx, network, address)
+		},
+	}
+}

transport/internet/system_dns_android.go

@@ -0,0 +1,21 @@
+// +build android
+
+package internet
+
+import (
+	"context"
+	"net"
+)
+
+func init() {
+	NewDNSResolver = func() *net.Resolver {
+		return &net.Resolver{
+			PreferGo: true,
+			Dial: func(ctx context.Context, network, _ string) (net.Conn, error) {
+				const systemDNS = "8.8.8.8:53"
+				var dialer net.Dialer
+				return dialer.DialContext(ctx, network, systemDNS)
+			},
+		}
+	}
+}

transport/internet/system_dns_test.go

@@ -0,0 +1,13 @@
+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)
+	}
+}