Change: Send a message with excluded hosts count to ospd. (#1528)

Also, the excluded hosts count is subtracted from the hosts count sent to ospd.

With this change, openvas sends the information necessary for the progress calculation,
and ospd doesn't have to calculate the excluded hosts and subtract from the total amount of hosts.

src/attack.c

@@ -912,22 +912,23 @@ attack_start (struct ipc_context *ipcc, struct attack_start_args *args)
     }
 }
 
-static void
+static int
 apply_hosts_excluded (gvm_hosts_t *hosts)
 {
   const char *exclude_hosts = prefs_get ("exclude_hosts");
-
+  int ret = 0;
   /* Exclude hosts ? */
   if (exclude_hosts)
     {
       /* Exclude hosts, resolving hostnames. */
-      int ret = gvm_hosts_exclude (hosts, exclude_hosts);
+      ret = gvm_hosts_exclude (hosts, exclude_hosts);
 
       if (ret > 0)
         g_message ("exclude_hosts: Skipped %d host(s).", ret);
       if (ret < 0)
         g_message ("exclude_hosts: Error.");
     }
+  return ret;
 }
 
 #ifdef FEATURE_HOSTS_ALLOWED_ONLY
@@ -1279,16 +1280,23 @@ attack_network (struct scan_globals *globals)
   apply_hosts_allow_deny (hosts);
 #endif
 
+  // Remove the excluded hosts
+  int exc = apply_hosts_excluded (hosts);
+
+  /* Send the excluded hosts count to the client, after removing duplicated and
+   * unresolved hosts.*/
+  sprintf (buf, "%d", exc + already_excluded);
+  connect_main_kb (&main_kb);
+  message_to_client (main_kb, buf, NULL, NULL, "HOSTS_EXCLUDED");
+  kb_lnk_reset (main_kb);
+
   /* Send the hosts count to the client, after removing duplicated and
    * unresolved hosts.*/
-  sprintf (buf, "%d", gvm_hosts_count (hosts) + already_excluded);
+  sprintf (buf, "%d", gvm_hosts_count (hosts));
   connect_main_kb (&main_kb);
   message_to_client (main_kb, buf, NULL, NULL, "HOSTS_COUNT");
   kb_lnk_reset (main_kb);
 
-  // Remove the excluded hosts
-  apply_hosts_excluded (hosts);
-
   host = gvm_hosts_next (hosts);
   if (host == NULL)
     goto stop;