Fix: openvas-nasl can not read KB when forking (#1621)

Jira: SC-1052

Allows the parent process to return to main function and perform a kb cleanup.
All children processes return as well, but they can't cleanup the kb, since it could be still in use by other fork()ed child.

misc/plugutils.c

@@ -1207,6 +1207,12 @@ plug_get_key (struct script_infos *args, char *name, int *type, size_t *len,
       res = res->next;
     }
   kb_item_free (res_list);
+
+  // Allow to return to the main process if parent process is openvas-nasl.
+  // So, the main process can do e.g. a kb clean up
+  if (args->standalone)
+    return NULL;
+
   _exit (0);
 }
 

nasl/nasl.c

@@ -330,6 +330,7 @@ main (int argc, char **argv)
       struct in6_addr ip6;
       kb_t kb;
       int rc;
+      int process_id;
 
       if (prefs_get_bool ("expand_vhosts"))
         gvm_host_add_reverse_lookup (host);
@@ -341,6 +342,8 @@ main (int argc, char **argv)
         exit (1);
 
       set_main_kb (kb);
+      process_id = getpid ();
+
       script_infos = init (&ip6, host->vhosts, kb);
       for (int i = 0; nasl_filenames[i] != NULL; i++)
         {
@@ -386,6 +389,10 @@ main (int argc, char **argv)
         }
       g_free (script_infos->globals);
       g_free (script_infos);
+
+      if (process_id != getpid ())
+        exit (0);
+
       kb_delete (kb);
     }