fix domain name resolution for router

chain/resovle.go

@@ -15,10 +15,7 @@ func Resolve(ctx context.Context, network, addr string, r resolver.Resolver, hos
 		return addr, nil
 	}
 
-	host, port, err := net.SplitHostPort(addr)
-	if err != nil {
-		return "", err
-	}
+	host, port, _ := net.SplitHostPort(addr)
 	if host == "" {
 		return addr, nil
 	}

chain/router.go

@@ -155,6 +155,12 @@ func (r *Router) dial(ctx context.Context, network, address string) (conn net.Co
 	r.options.Logger.Debugf("dial %s/%s", address, network)
 
 	for i := 0; i < count; i++ {
+		address, err = Resolve(ctx, "ip", address, r.options.Resolver, r.options.HostMapper, r.options.Logger)
+		if err != nil {
+			r.options.Logger.Error(err)
+			break
+		}
+
 		var route Route
 		if r.options.Chain != nil {
 			route = r.options.Chain.Route(ctx, network, address)
@@ -169,12 +175,6 @@ func (r *Router) dial(ctx context.Context, network, address string) (conn net.Co
 			r.options.Logger.Debugf("route(retry=%d) %s", i, buf.String())
 		}
 
-		address, err = Resolve(ctx, "ip", address, r.options.Resolver, r.options.HostMapper, r.options.Logger)
-		if err != nil {
-			r.options.Logger.Error(err)
-			break
-		}
-
 		if route == nil {
 			route = DefaultRoute
 		}

go.mod

@@ -2,4 +2,4 @@ module github.com/go-gost/core
 
 go 1.18
 
-require golang.org/x/sys v0.5.0
+require golang.org/x/sys v0.6.0

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
-golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=