Suricata

Patch could be to improve the ENIP probing parser

diff --git a/src/app-layer-enip.c b/src/app-layer-enip.c
index 282294536..b9e3b32db 100644
--- a/src/app-layer-enip.c
+++ b/src/app-layer-enip.c
@@ -393,8 +393,24 @@ static uint16_t ENIPProbingParser(Flow *f, uint8_t direction,
         SCLogDebug("length too small to be a ENIP header");
         return ALPROTO_UNKNOWN;
     }
-
-    return ALPROTO_ENIP;
+    uint16_t cmd;
+    ByteExtractUint16(&cmd, BYTE_LITTLE_ENDIAN, sizeof(uint16_t),
+                      (const uint8_t *) (input));
+    switch(cmd) {
+            //fallthrough
+        case NOP:
+        case LIST_SERVICES:
+        case LIST_IDENTITY:
+        case LIST_INTERFACES:
+        case REGISTER_SESSION:
+        case UNREGISTER_SESSION:
+        case SEND_RR_DATA:
+        case SEND_UNIT_DATA:
+        case INDICATE_STATUS:
+        case CANCEL:
+            return ALPROTO_ENIP;
+    }
+    return ALPROTO_FAILED;
 }

 /**