relay: redirect some irc messages from clients to hide output (bug #33516)

Messages redirected by relay plugin: mode, ison, list, names, topic, who,
whois, whowas, time, userhost.

src/plugins/relay/irc/relay-irc.h

@@ -37,6 +37,7 @@ struct t_relay_irc_data
     struct t_hook *hook_signal_irc_in2;     /* signal "irc_in2"             */
     struct t_hook *hook_signal_irc_outtags; /* signal "irc_outtags"         */
     struct t_hook *hook_signal_irc_disc;    /* signal "irc_disconnected"    */
+    struct t_hook *hook_hsignal_irc_redir;  /* hsignal "irc_redirection_..."*/
 };
 
 extern void relay_irc_recv (struct t_relay_client *client,

src/plugins/relay/relay-client.c

@@ -99,6 +99,26 @@ relay_client_search_by_number (int number)
     return NULL;
 }
 
+/*
+ * relay_client_search_by_id: search a client by id
+ */
+
+struct t_relay_client *
+relay_client_search_by_id (int id)
+{
+    struct t_relay_client *ptr_client;
+
+    for (ptr_client = relay_clients; ptr_client;
+         ptr_client = ptr_client->next_client)
+    {
+        if (ptr_client->id == id)
+            return ptr_client;
+    }
+
+    /* client not found */
+    return NULL;
+}
+
 /*
  * relay_client_recv_cb: read data from a client
  */

src/plugins/relay/relay-client.h

@@ -71,6 +71,7 @@ extern int relay_client_count;
 
 extern int relay_client_valid (struct t_relay_client *client);
 extern struct t_relay_client *relay_client_search_by_number (int number);
+extern struct t_relay_client *relay_client_search_by_id (int id);
 extern int relay_client_recv_cb (void *arg_client, int fd);
 extern struct t_relay_client *relay_client_new (int sock, const char *address,
                                                 struct t_relay_server *server);