+ _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
+
+ /* Search user */
+ target = Client_Search(Req->argv[0]);
+ if (!target || (Client_Type(target) != CLIENT_USER))
+ return IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
+ Client_ID(Client), Req->argv[0]);
+
+ chan = Channel_Search(Req->argv[1]);
+ if (chan) {
+ /* Channel exists. Is the user a valid member of the channel? */
+ if (!Channel_IsMemberOf(chan, from))
+ return IRC_WriteErrClient(from, ERR_NOTONCHANNEL_MSG,
+ Client_ID(Client),
+ Req->argv[1]);
+
+ /* Is the channel "invite-disallow"? */
+ if (Channel_HasMode(chan, 'V'))
+ return IRC_WriteErrClient(from, ERR_NOINVITE_MSG,
+ Client_ID(from),
+ Channel_Name(chan));
+
+ /* Is the channel "invite-only"? */
+ if (Channel_HasMode(chan, 'i')) {
+ /* Yes. The user issuing the INVITE command must be
+ * channel owner/admin/operator/halfop! */
+ if (!Channel_UserHasMode(chan, from, 'q') &&
+ !Channel_UserHasMode(chan, from, 'a') &&
+ !Channel_UserHasMode(chan, from, 'o') &&
+ !Channel_UserHasMode(chan, from, 'h'))
+ return IRC_WriteErrClient(from,
+ ERR_CHANOPRIVSNEEDED_MSG,
+ Client_ID(from),
+ Channel_Name(chan));
+ remember = true;
+ }
+
+ /* Is the target user already member of the channel? */
+ if (Channel_IsMemberOf(chan, target))
+ return IRC_WriteErrClient(from, ERR_USERONCHANNEL_MSG,
+ Client_ID(from),
+ Req->argv[0], Req->argv[1]);
+
+ /* If the target user is banned on that channel: remember invite */
+ if (Lists_Check(Channel_GetListBans(chan), target))
+ remember = true;
+
+ if (remember) {
+ /* We must remember this invite */
+ if (!Channel_AddInvite(chan, Client_MaskCloaked(target),
+ true))
+ return CONNECTED;
+ }
+ }
+
+ LogDebug("User \"%s\" invites \"%s\" to \"%s\" ...", Client_Mask(from),
+ Req->argv[0], Req->argv[1]);
+
+ /*
+ * RFC 2812 states:
+ * 'There is no requirement that the channel [..] must exist or be a
+ * valid channel'. The problem with this is that this allows the
+ * "channel" to contain spaces, in which case we must prefix its name
+ * with a colon to make it clear that it is only a single argument.
+ */
+ colon_if_necessary = strchr(Req->argv[1], ' ') ? ":":"";
+ /* Inform target client */
+ IRC_WriteStrClientPrefix(target, from, "INVITE %s %s%s", Req->argv[0],
+ colon_if_necessary, Req->argv[1]);
+
+ if (Client_Conn(target) > NONE) {
+ /* The target user is local, so we have to send the status code */
+ if (!IRC_WriteStrClientPrefix(from, target, RPL_INVITING_MSG,
+ Client_ID(from), Req->argv[0],
+ colon_if_necessary, Req->argv[1]))
+ return DISCONNECTED;
+
+ if (Client_HasMode(target, 'a') &&
+ !IRC_WriteStrClient(from, RPL_AWAY_MSG, Client_ID(from),
+ Client_ID(target), Client_Away(target)))
+ return DISCONNECTED;
+ }