split 3 times, log last part

include client ip in log

pkg/udpproxy/session.go

@@ -64,7 +64,11 @@ func (s *session) proxyFrom(buf []byte) error {
 	}
 
 	if s.isRconResponsePacket(buf) {
-		log.Debugf("Response: %s", string(buf[10:]))
+		if s.isBadRconResponse(buf) {
+			log.Infof("Response: Bad rcon from %s", s.caddr.IP)
+		} else {
+			log.Debugf("Response: %s", string(buf[10:]))
+		}
 	}
 
 	return nil
@@ -85,8 +89,8 @@ func (s *session) proxyTo(buf []byte) error {
 	}
 
 	if s.isRconRequestPacket(buf) {
-		parts := strings.Split(string(buf), " ")
-		log.Infof("From [%s] To [%s] Command: %s", s.caddr.IP, s.serverConn.RemoteAddr(), strings.Join(parts[2:], " "))
+		parts := strings.SplitN(string(buf), " ", 3)
+		log.Infof("From [%s] To [%s] Command: %s", s.caddr.IP, s.serverConn.RemoteAddr(), parts[len(parts)-1])
 	}
 
 	return nil

pkg/udpproxy/validator.go

@@ -26,3 +26,7 @@ func (v *validator) isQueryResponsePacket(buf []byte) bool {
 func (v *validator) isValidResponsePacket(buf []byte) bool {
 	return v.isRconResponsePacket(buf) || v.isQueryResponsePacket(buf)
 }
+
+func (v *validator) isBadRconResponse(buf []byte) bool {
+	return string(buf[10:18]) == "Bad rcon"
+}