From 3e039824de4980c435d2e562c78411b9888c214b Mon Sep 17 00:00:00 2001
From: onyx-and-iris <code@onyxandiris.online>
Date: Wed, 3 Apr 2024 20:54:10 +0100
Subject: [PATCH] log bad rcon requests at info level

include client ip in log
---
 pkg/udpproxy/session.go   | 6 +++++-
 pkg/udpproxy/validator.go | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/pkg/udpproxy/session.go b/pkg/udpproxy/session.go
index 9121c58..9e31d10 100644
--- a/pkg/udpproxy/session.go
+++ b/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.isBadRconRequest(buf) {
+			log.Infof("Response: Bad rcon from %s", s.caddr.IP)
+		} else {
+			log.Debugf("Response: %s", string(buf[10:]))
+		}
 	}
 
 	return nil
diff --git a/pkg/udpproxy/validator.go b/pkg/udpproxy/validator.go
index 631a504..0ff8370 100644
--- a/pkg/udpproxy/validator.go
+++ b/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) isBadRconRequest(buf []byte) bool {
+	return string(buf[10:18]) == "Bad rcon"
+}