From 0db12b1390b1cc554b927230c76b05264c05b498 Mon Sep 17 00:00:00 2001
From: Luca Deri <deri@ntop.org>
Date: Thu, 2 Nov 2023 20:46:14 +0100
Subject: [PATCH] In case a pattern is redefined (for instance with
 protos.txt), the custom definition overwrites the previous one (so far it was
 ignored)

---
 src/lib/third_party/src/ahocorasick.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/lib/third_party/src/ahocorasick.c b/src/lib/third_party/src/ahocorasick.c
index 12bc422ac88..eb714694328 100644
--- a/src/lib/third_party/src/ahocorasick.c
+++ b/src/lib/third_party/src/ahocorasick.c
@@ -262,7 +262,18 @@ AC_ERROR_t ac_automata_add (AC_AUTOMATA_t * thiz, AC_PATTERN_t * patt)
      thiz->max_str_len = patt->length;
 
   if(n->final && n->matched_patterns) {
+    /*
+      In this case an existing pattern exists and thus we overwrite
+      the previous protocol value with this one
+    */
+
+#if 1
+    /* nDPI code */
+    n->matched_patterns->patterns[0].rep.number = patt->rep.number;
+#else
+    /* original code */
     patt->rep.number = n->matched_patterns->patterns[0].rep.number;
+#endif
     return ACERR_DUPLICATE_PATTERN;
   }