From 4d3aa6c6e0282523e8b2a5b29c0917e63e787395 Mon Sep 17 00:00:00 2001
From: Yves Rutschle <git1@rutschle.net>
Date: Tue, 3 Mar 2026 22:05:01 +0100
Subject: [PATCH] sanity checks that regex options are only used with the right
 probe and with libpcre2 support compiled in

---
 sslh-main.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sslh-main.c b/sslh-main.c
index fd4a967..5dd36df 100644
--- a/sslh-main.c
+++ b/sslh-main.c
@@ -220,6 +220,23 @@ static void config_protocols()
     }
 }
 
+static void config_sanity_regex(const struct sslhcfg_protocols_item* prot)
+{
+    if (prot->regex_patterns_len > 0) {
+        if (strcmp(prot->name, "regex") != 0) {
+            print_message(msg_config_error, "name: \"%s\"; host: \"%s\"; port: \"%s\": "
+                          "regex_patterns setting is only applicable to `regex' probe.\n"
+                          "This setting will be ignored\n",
+                          prot->name, prot->host, prot->port);
+        }
+#ifndef ENABLE_REGEX
+        print_message(msg_config_error, "name: \"%s\"; host: \"%s\"; port: \"%s\": "
+                      "Uses regex_patterns, but libpcre2 support was not compiled in.\n"
+                      "This setting will be ignored.\n",
+                      prot->name, prot->host, prot->port);
+#endif
+    }
+}
 
 void config_sanity_check(struct sslhcfg_item* cfg)
 {
@@ -249,6 +266,8 @@ void config_sanity_check(struct sslhcfg_item* cfg)
             }
         }
 
+        config_sanity_regex(&cfg->protocols[i]);
+
         if (cfg->protocols[i].is_udp) {
             if (cfg->protocols[i].tfo_ok) {
                 print_message(msg_config_error, "name: \"%s\"; host: \"%s\"; port: \"%s\": "