Handles better the memory utilization

- Added reference counts to Rule and AuditLog;
- Some memory leaks were removed, including GeoLookup;
- Deal better with parser errors;
- Overriding the AutlogLogWritter destructor.

src/utils/geo_lookup.cc

@@ -30,8 +30,20 @@ namespace ModSecurity {
 namespace Utils {
 
 
-bool GeoLookup::setDataBase(std::string file_path) {
-    m_gi = GeoIP_open(file_path.c_str(), GEOIP_INDEX_CACHE);
+GeoLookup::~GeoLookup() {
+    cleanUp();
+}
+
+void GeoLookup::cleanUp() {
+    if (m_gi != NULL) {
+        GeoIP_delete(m_gi);
+        m_gi = NULL;
+    }
+}
+
+
+bool GeoLookup::setDataBase(const std::string& filePath) {
+    m_gi = GeoIP_open(filePath.c_str(), GEOIP_INDEX_CACHE);
 
     if (m_gi == NULL) {
         return false;

src/utils/geo_lookup.h

@@ -36,13 +36,15 @@ class GeoLookup {
         return instance;
     }
 
-    bool setDataBase(std::string file_path);
+    bool setDataBase(const std::string& filePath);
     bool lookup(const std::string& target, GeoIPRecord **georec,
         std::function<bool(int, std::string)> callback);
+    void cleanUp();
 
  private:
-    GeoLookup() : m_gi(NULL) {}
-
+    GeoLookup()
+        : m_gi(NULL) { }
+    ~GeoLookup();
     GeoLookup(GeoLookup const&);
     void operator=(GeoLookup const&);