Using real server signature on status call

On Apache platform the server signature can be replaced using the
SecServerSignature directive. Status call was using the signature informed by
this directive instead of using the original one. As reported at #702.

Author: Felipe Zimmerle

apache2/mod_security2.c

@@ -54,7 +54,7 @@ char DSOLOCAL *chroot_dir = NULL;
 
 char DSOLOCAL *new_server_signature = NULL;
 
-static char *real_server_signature = NULL;
+char DSOLOCAL *real_server_signature = NULL;
 
 char DSOLOCAL *guardianlog_name = NULL;
 

apache2/modsecurity.h

@@ -133,6 +133,7 @@ typedef struct msc_parm msc_parm;
 #define FATAL_ERROR "ModSecurity: Fatal error (memory allocation or unexpected internal error)!"
 
 extern DSOLOCAL char *new_server_signature;
+extern DSOLOCAL char *real_server_signature;
 extern DSOLOCAL char *chroot_dir;
 
 extern module AP_MODULE_DECLARE_DATA security2_module;

apache2/msc_status_engine.c

@@ -349,11 +349,7 @@ int DSOLOCAL msc_beacon_string (char *beacon_string, int beacon_string_max_len)
 #endif
     libxml = LIBXML_DOTTED_VERSION;
     modsec = MODSEC_VERSION;
-#ifdef WIN32
-    apache = "IIS";
-#else
-    apache = apache_get_server_version();
-#endif
+    apache = real_server_signature;
 
     /* 6 represents: strlen("(null)") */
     beacon_string_len = (modsec ? strlen(modsec) : 6) +