go vet

client.go

@@ -34,11 +34,11 @@ func (sc *Client) handShake() error {
 	}
 
 	if buf[0] != socks5Version {
-		return fmt.Errorf("error socks version %s", buf[0])
+		return fmt.Errorf("error socks version %d", buf[0])
 	}
 
 	if buf[1] != 0x00 && buf[1] != 0x02 {
-		return fmt.Errorf("server return with code %s", buf[1])
+		return fmt.Errorf("server return with code %d", buf[1])
 	}
 
 	if buf[1] == 0x00 {

socks4.go

@@ -87,7 +87,7 @@ func (s4 *socks4Conn) processRequest() error {
 
 	// command only support connect
 	if buf[0] != cmdConnect {
-		return fmt.Errorf("error command %s", buf[0])
+		return fmt.Errorf("error command %d", buf[0])
 	}
 
 	// get port

socks5.go

@@ -196,7 +196,7 @@ func (s5 *socks5Conn) processRequest() error {
 
 	// command only support connect
 	if buf[1] != cmdConnect {
-		return fmt.Errorf("unsupported command %s", buf[1])
+		return fmt.Errorf("unsupported command %d", buf[1])
 	}
 
 	hlen := 0   // target address length