General improvements on audit logs information

Making actions: msg, logdata, tag and others to work in the same
fashion that they work on ModSecurity v2.x

src/actions/msg.cc

@@ -22,6 +22,25 @@
 #include "modsecurity/transaction.h"
 #include "src/utils.h"
 #include "src/macro_expansion.h"
+#include "modsecurity/rule.h"
+
+/*
+ * Description: Assigns a custom message to the rule or chain in which it
+ * appears. The message will be logged along with every alert.
+ *
+ * Action Group: Meta-data
+ *
+ * Example:
+ * SecRule &REQUEST_HEADERS:Host "@eq 0" "log,id:60008,severity:2,msg:'Request Missing a Host Header'"
+ *
+ * Note  : The msg information appears in the error and/or audit log files
+ *         and is not sent back to the client in response headers.
+ *
+ * Note 2: The msg action can appear multiple times in the SecRule, however
+ *         just the last one will be take into consideration.
+ *
+ */
+
 
 namespace modsecurity {
 namespace actions {
@@ -36,13 +55,16 @@ Msg::Msg(std::string action)
 
 bool Msg::evaluate(Rule *rule, Transaction *transaction) {
     std::string msg = MacroExpansion::expand(m_msg, transaction);
+
 #ifndef NO_LOGS
     transaction->debug(9, "Saving msg: " + msg);
 #endif
-    transaction->m_rulesMessages.push_back(msg);
-    transaction->serverLog(msg);
+
+    rule->m_log_message = msg;
+
     return true;
 }
 
+
 }  // namespace actions
 }  // namespace modsecurity