Standart Don't allow users with umode +B to join (channel mode +B)
u_int is_invited(aClient *sptr, aChannel *chptr) {
for (lp = sptr->user->invited; lp; lp = lp->next)
if (lp->value.chptr == chptr)
return 1;

return 0;
}

static int m_myjoin(aClient *sptr, aChannel *chptr, char *parv[]) {
if (chptr != NULL && is_invited(sptr, chptr) && MyClient(sptr) && !IsAnOper(sptr) && !IsULine(sptr)) {
if (chptr->mode.extmode & EXTCMODE_NOBOTS && sptr->umodes & UMODE_BOT) {
sendnotice(sptr, "*** Cannot join channel %s: Bots are not permitted.", chptr->chname);
return HOOK_DENY;
}
}
return HOOK_CONTINUE;
}