chore: parse user's hosts before remoteDial

constant/dns.go

@@ -16,6 +16,7 @@ const (
 	DNSNormal DNSMode = iota
 	DNSFakeIP
 	DNSMapping
+	DNSHosts
 )
 
 type DNSMode int
@@ -64,6 +65,8 @@ func (e DNSMode) String() string {
 		return "fake-ip"
 	case DNSMapping:
 		return "redir-host"
+	case DNSHosts:
+		return "hosts"
 	default:
 		return "unknown"
 	}

constant/metadata.go

@@ -145,7 +145,7 @@ func (m *Metadata) Resolved() bool {
 // Pure is used to solve unexpected behavior
 // when dialing proxy connection in DNSMapping mode.
 func (m *Metadata) Pure() *Metadata {
-	if m.DNSMode == DNSMapping && m.DstIP.IsValid() {
+	if (m.DNSMode == DNSMapping || m.DNSMode == DNSHosts) && m.DstIP.IsValid() {
 		copyM := *m
 		copyM.Host = ""
 		if copyM.DstIP.Is4() {

tunnel/tunnel.go

@@ -331,9 +331,18 @@ func handleTCPConn(connCtx C.ConnContext) {
 		return
 	}
 
+	dialMetadata := metadata
+	if len(metadata.Host) > 0 {
+		if node := resolver.DefaultHosts.Search(metadata.Host); node != nil {
+			dialMetadata.DstIP = node.Data
+			dialMetadata.DNSMode = C.DNSHosts
+			dialMetadata = dialMetadata.Pure()
+		}
+	}
+
 	ctx, cancel := context.WithTimeout(context.Background(), C.DefaultTCPTimeout)
 	defer cancel()
-	remoteConn, err := proxy.DialContext(ctx, metadata)
+	remoteConn, err := proxy.DialContext(ctx, dialMetadata)
 	if err != nil {
 		if rule == nil {
 			log.Warnln("[TCP] dial %s to %s error: %s", proxy.Name(), metadata.RemoteAddress(), err.Error())