Exemplo n.º 1
0
func (me *Client) SetupNegotiate(millis int, command byte, option byte, yes_event telnet.EventType, no_event telnet.EventType) (bool, telnet.Event) {
	me.telnet.TelnetSendNegotiate(command, option)
	tev, timeout, close := me.TryReadEvent(millis)

	if tev == nil || timeout || close {
		monolog.Info("Timeout or close in TryReadEvent")
		return false, nil
	}

	evtype := telnet.EventTypeOf(tev)

	if evtype == no_event {
		monolog.Info("Negative event no_event %v %v %v", tev, evtype, no_event)
		return false, tev
	}

	if evtype != yes_event {
		monolog.Info("Unexpected event yes_event %v %v %v", tev, evtype, yes_event)
		return false, tev
	}

	if tev == nil {
		return false, tev
	}

	return true, tev
}
Exemplo n.º 2
0
// Negotiate MTTS/TTYPE (TERMINAL TYPE) support
func (me *Client) SetupTType() telnet.Event {
	me.info.terminals = nil
	ok, tev := me.SetupNegotiate(1000, t.TELNET_DO, t.TELNET_TELOPT_TTYPE, t.TELNET_WILL_EVENT, t.TELNET_WONT_EVENT)
	if !ok {
		return tev
	}

	var last string = "none"
	var now string = ""

	for last != now {
		last = now
		me.telnet.TelnetTTypeSend()
		var tev2 telnet.Event = nil
		// Some clients (like KildClient, but not TinTin or telnet),
		// insist on spamming useless NUL characters
		// here... So we have to retry a few times to get a ttype_is
		// throwing away any undesirable junk in between.
	GET_TTYPE:
		for index := 0; index < 3; index++ {
			tev2, _, _ = me.TryReadEvent(1000)
			if tev2 != nil {
				etyp := telnet.EventTypeOf(tev2)
				monolog.Info("Waiting for TTYPE: %T %v %d", tev2, tev2, etyp)
				if telnet.IsEventType(tev2, t.TELNET_TTYPE_EVENT) {
					monolog.Info("TTYPE received: %T %v %d", tev2, tev2, etyp)
					break GET_TTYPE
				}
			} else { // and some clients don't respond, even
				monolog.Info("Waiting for TTYPE: %T", tev2)
			}
		}

		if tev2 == nil || !telnet.IsEventType(tev2, t.TELNET_TTYPE_EVENT) {
			etyp := telnet.EventTypeOf(tev2)
			monolog.Warning("Received no TTYPE: %T %v %d", tev2, tev2, etyp)
			return tev2
		}

		ttypeevent := tev2.(*telnet.TTypeEvent)
		now = ttypeevent.Name
		if !me.HasTerminal(now) {
			me.info.terminals = append(me.info.terminals, now)
		}
		me.info.terminal = now
	}

	monolog.Info("Client %d supports terminals %v", me.id, me.info.terminals)
	monolog.Info("Client %d active terminal %v", me.id, me.info.terminal)

	//  MTTS support
	for i := range me.info.terminals {
		term := me.info.terminals[i]
		monolog.Info("Checking MTTS support: %s", term)
		if strings.HasPrefix(term, "MTTS ") {
			// it's an mtts terminal
			strnum := strings.TrimPrefix(term, "MTTS ")
			num, err := strconv.Atoi(strnum)
			if err == nil {
				me.info.mtts = num
				monolog.Info("Client %d supports mtts %d", me.id, me.info.mtts)
			} else {
				monolog.Warning("Client %d could not parse mtts %s %v", me.id, strnum, err)
			}
		}
	}
	me.info.ttype = true
	return nil
}