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/* This function adds as an extra (weird) operoverride.
 * Currently it's only used if you try to operoverride for a +z channel,
 * if you then do '/join #chan override' it will put the channel -z and allow you directly in.
 * This is to avoid attackers from using 'race conditions' to prevent you from joining.
 * PARAMETERS: sptr = the client, chptr = the channel, mval = mode value (eg MODE_ONLYSECURE),
 *             mchar = mode char (eg 'z')
 * RETURNS: 1 if operoverride, 0 if not.
 */
int extended_operoverride(aClient *sptr, aChannel *chptr, char *key, int mval, char mchar) ...

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DLLFUNC int _can_join(aClient *cptr, aClient *sptr, aChannel *chptr, char *key, char *link, char *parv[])
{
Link *lp;
Ban *banned;

	if ((chptr->mode.mode & MODE_ONLYSECURE) && !(sptr->umodes & UMODE_SECURE))
	{
		if (IsAnOper(sptr))
		{
			/* Yeah yeah.. duplicate code..
			 * Anyway: if the channel is +z we still allow an ircop to bypass it
			 * if they are invited.
			 */
			for (lp = sptr->user->invited; lp; lp = lp->next)
				if (lp->value.chptr == chptr)
					return 0;
		}
		return (ERR_SECUREONLYCHAN);
	}
...