Beispiel #1
0
int
getconnmode(void)
{
    int mode = 0;

    if (my_want_state_is_dont(TELOPT_ECHO))
	mode |= MODE_ECHO;

    if (localflow)
	mode |= MODE_FLOW;

    if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY))
	mode |= MODE_INBIN;

    if (eight & 2)
	mode |= MODE_OUT8;
    if (his_want_state_is_will(TELOPT_BINARY))
	mode |= MODE_OUTBIN;

#ifdef	KLUDGELINEMODE
    if (kludgelinemode) {
	if (my_want_state_is_dont(TELOPT_SGA)) {
	    mode |= (MODE_TRAPSIG|MODE_EDIT);
	    if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) {
		mode &= ~MODE_ECHO;
	    }
	}
	return(mode);
    }
#endif
    if (my_want_state_is_will(TELOPT_LINEMODE))
	mode |= linemode;
    return(mode);
}
Beispiel #2
0
static void
dontoption(int option)
{

	if (will_wont_resp[option]) {
	    --will_wont_resp[option];
	    if (will_wont_resp[option] && my_state_is_wont(option))
		--will_wont_resp[option];
	}

	if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
	    switch (option) {
	    case TELOPT_LINEMODE:
		linemode = 0;	/* put us back to the default state */
		break;
#ifdef	OLD_ENVIRON
	    case TELOPT_NEW_ENVIRON:
		/*
		 * The new environ option wasn't recognized, try
		 * the old one.
		 */
		send_will(TELOPT_OLD_ENVIRON, 1);
		telopt_environ = TELOPT_OLD_ENVIRON;
		break;
#endif
	    }
	    /* we always accept a DONT */
	    set_my_want_state_wont(option);
	    if (my_state_is_will(option))
		send_wont(option, 0);
	    setconnmode(0);			/* Set new tty mode */
	}
	set_my_state_wont(option);
}
Beispiel #3
0
void
setconnmode (int force)
{
#ifdef	ENCRYPTION
  static int enc_passwd = 0;
#endif /* ENCRYPTION */
  register int newmode;

  newmode = getconnmode () | (force ? MODE_FORCE : 0);

  TerminalNewMode (newmode);

#ifdef  ENCRYPTION
  if ((newmode & (MODE_ECHO | MODE_EDIT)) == MODE_EDIT)
    {
      if (my_want_state_is_will (TELOPT_ENCRYPT)
	  && (enc_passwd == 0) && !encrypt_output)
	{
	  encrypt_request_start (0, 0);
	  enc_passwd = 1;
	}
    }
  else
    {
      if (enc_passwd)
	{
	  encrypt_request_end ();
	  enc_passwd = 0;
	}
    }
#endif /* ENCRYPTION */

}
Beispiel #4
0
void send_will(int option, int init) {
    if (init) {
        if ((will_wont_resp[option] == 0 && my_state_is_will(option))||
                my_want_state_is_will(option))
            return;
        set_my_want_state_will(option);
        will_wont_resp[option]++;
    }
    netoprintf((char *) will, option);

    DIAG(TD_OPTIONS, printoption("td: send will", option));
}
Beispiel #5
0
int
TerminalSpecialChars (int c)
{
  if (c == termIntChar)
    {
      intp ();
      return 0;
    }
  else if (c == termQuitChar)
    {
#ifdef	KLUDGELINEMODE
      if (kludgelinemode)
	sendbrk ();
      else
#endif
	sendabort ();
      return 0;
    }
  else if (c == termEofChar)
    {
      if (my_want_state_is_will (TELOPT_LINEMODE))
	{
	  sendeof ();
	  return 0;
	}
      return 1;
    }
  else if (c == termSuspChar)
    {
      sendsusp ();
      return (0);
    }
  else if (c == termFlushChar)
    {
      xmitAO ();		/* Transmit Abort Output */
      return 0;
    }
  else if (!MODE_LOCAL_CHARS (globalmode))
    {
      if (c == termKillChar)
	{
	  xmitEL ();
	  return 0;
	}
      else if (c == termEraseChar)
	{
	  xmitEC ();		/* Transmit Erase Character */
	  return 0;
	}
    }
  return 1;
}
Beispiel #6
0
void
send_will(int c, int init)
{
    if (init) {
	if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
				my_want_state_is_will(c))
	    return;
	set_my_want_state_will(c);
	will_wont_resp[c]++;
    }
    NET2ADD(IAC, WILL);
    NETADD(c);
    printoption("SENT", WILL, c);
}
Beispiel #7
0
    int
Scheduler(int block) /* should we block in the select ? */
{
		/* One wants to be a bit careful about setting returnValue
		 * to one, since a one implies we did some useful work,
		 * and therefore probably won't be called to block next
		 * time (TN3270 mode only).
		 */
    int returnValue;
    int netin, netout, netex, ttyin, ttyout;

    /* Decide which rings should be processed */

    netout = ring_full_count(&netoring) &&
	    (flushline ||
		(my_want_state_is_wont(TELOPT_LINEMODE)
#ifdef	KLUDGELINEMODE
			&& (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
#endif
		) ||
			my_want_state_is_will(TELOPT_BINARY));
    ttyout = ring_full_count(&ttyoring);

    ttyin = ring_empty_count(&ttyiring);

    netin = !ISend && ring_empty_count(&netiring);

    netex = !SYNCHing;

    /* If we have seen a signal recently, reset things */

    if (scheduler_lockout_tty) {
        ttyin = ttyout = 0;
    }

    /* Call to system code to process rings */

    returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);

    /* Now, look at the input rings, looking for work to do. */

    if (ring_full_count(&ttyiring)) {
	    returnValue |= telsnd();
    }

    if (ring_full_count(&netiring)) {
	returnValue |= telrcv();
    }
    return returnValue;
}
Beispiel #8
0
    void
SetIn3270(void)
{
    if (Sent3270TerminalType && my_want_state_is_will(TELOPT_BINARY)
		&& my_want_state_is_do(TELOPT_BINARY) && !donebinarytoggle) {
	if (!In3270) {
	    In3270 = 1;
	    Init3270();		/* Initialize 3270 functions */
	    /* initialize terminal key mapping */
	    InitTerminal();	/* Start terminal going */
	    setconnmode(0);
	}
    } else {
	if (In3270) {
	    StopScreen(1);
	    In3270 = 0;
	    Stop3270();		/* Tell 3270 we aren't here anymore */
	    setconnmode(0);
	}
    }
}
Beispiel #9
0
static void
dontoption(int option)
{

	if (will_wont_resp[option]) {
	    --will_wont_resp[option];
	    if (will_wont_resp[option] && my_state_is_wont(option))
		--will_wont_resp[option];
	}

	if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
	    switch (option) {
	    case TELOPT_LINEMODE:
		linemode = 0;	/* put us back to the default state */
		break;
	    }
	    /* we always accept a DONT */
	    set_my_want_state_wont(option);
	    if (my_state_is_will(option))
		send_wont(option, 0);
	    setconnmode(0);			/* Set new tty mode */
	}
	set_my_state_wont(option);
}
Beispiel #10
0
/*
 * localstat
 *
 * This function handles all management of linemode.
 *
 * Linemode allows the client to do the local editing of data
 * and send only complete lines to the server.  Linemode state is
 * based on the state of the pty driver.  If the pty is set for
 * external processing, then we can use linemode.  Further, if we
 * can use real linemode, then we can look at the edit control bits
 * in the pty to determine what editing the client should do.
 *
 * Linemode support uses the following state flags to keep track of
 * current and desired linemode state.
 *	alwayslinemode : true if -l was specified on the telnetd
 * 	command line.  It means to have linemode on as much as
 *	possible.
 *
 * 	lmodetype: signifies whether the client can
 *	handle real linemode, or if use of kludgeomatic linemode
 *	is preferred.  It will be set to one of the following:
 *		REAL_LINEMODE : use linemode option
 *		NO_KLUDGE : don't initiate kludge linemode.
 *		KLUDGE_LINEMODE : use kludge linemode
 *		NO_LINEMODE : client is ignorant of linemode
 *
 *	linemode, uselinemode : linemode is true if linemode
 *	is currently on, uselinemode is the state that we wish
 *	to be in.  If another function wishes to turn linemode
 *	on or off, it sets or clears uselinemode.
 *
 *	editmode, useeditmode : like linemode/uselinemode, but
 *	these contain the edit mode states (edit and trapsig).
 *
 * The state variables correspond to some of the state information
 * in the pty.
 *	linemode:
 *		In real linemode, this corresponds to whether the pty
 *		expects external processing of incoming data.
 *		In kludge linemode, this more closely corresponds to the
 *		whether normal processing is on or not.  (ICANON in
 *		system V, or COOKED mode in BSD.)
 *		If the -l option was specified (alwayslinemode), then
 *		an attempt is made to force external processing on at
 *		all times.
 *
 * The following heuristics are applied to determine linemode
 * handling within the server.
 *	1) Early on in starting up the server, an attempt is made
 *	   to negotiate the linemode option.  If this succeeds
 *	   then lmodetype is set to REAL_LINEMODE and all linemode
 *	   processing occurs in the context of the linemode option.
 *	2) If the attempt to negotiate the linemode option failed,
 *	   and the "-k" (don't initiate kludge linemode) isn't set,
 *	   then we try to use kludge linemode.  We test for this
 *	   capability by sending "do Timing Mark".  If a positive
 *	   response comes back, then we assume that the client
 *	   understands kludge linemode (ech!) and the
 *	   lmodetype flag is set to KLUDGE_LINEMODE.
 *	3) Otherwise, linemode is not supported at all and
 *	   lmodetype remains set to NO_LINEMODE (which happens
 *	   to be 0 for convenience).
 *	4) At any time a command arrives that implies a higher
 *	   state of linemode support in the client, we move to that
 *	   linemode support.
 *
 * A short explanation of kludge linemode is in order here.
 *	1) The heuristic to determine support for kludge linemode
 *	   is to send a do timing mark.  We assume that a client
 *	   that supports timing marks also supports kludge linemode.
 *	   A risky proposition at best.
 *	2) Further negotiation of linemode is done by changing the
 *	   the server's state regarding SGA.  If server will SGA,
 *	   then linemode is off, if server won't SGA, then linemode
 *	   is on.
 */
void
localstat(void)
{
	int need_will_echo = 0;

	/*
	 * Check for changes to flow control if client supports it.
	 */
	flowstat();

	/*
	 * Check linemode on/off state
	 */
	uselinemode = tty_linemode();

	/*
	 * If alwayslinemode is on, and pty is changing to turn it off, then
	 * force linemode back on.
	 */
	if (alwayslinemode && linemode && !uselinemode) {
		uselinemode = 1;
		tty_setlinemode(uselinemode);
	}

	if (uselinemode) {
		/*
		 * Check for state of BINARY options.
		 *
		 * We only need to do the binary dance if we are actually going
		 * to use linemode.  As this confuses some telnet clients
		 * that don't support linemode, and doesn't gain us
		 * anything, we don't do it unless we're doing linemode.
		 * -Crh ([email protected])
		 */

		if (tty_isbinaryin()) {
			if (his_want_state_is_wont(TELOPT_BINARY))
				send_do(TELOPT_BINARY, 1);
		} else {
			if (his_want_state_is_will(TELOPT_BINARY))
				send_dont(TELOPT_BINARY, 1);
		}

		if (tty_isbinaryout()) {
			if (my_want_state_is_wont(TELOPT_BINARY))
				send_will(TELOPT_BINARY, 1);
		} else {
			if (my_want_state_is_will(TELOPT_BINARY))
				send_wont(TELOPT_BINARY, 1);
		}
	}

#ifdef	ENCRYPTION
	/*
	 * If the terminal is not echoing, but editing is enabled,
	 * something like password input is going to happen, so
	 * if we the other side is not currently sending encrypted
	 * data, ask the other side to start encrypting.
	 */
	if (his_state_is_will(TELOPT_ENCRYPT)) {
		static int enc_passwd = 0;
		if (uselinemode && !tty_isecho() && tty_isediting()
		    && (enc_passwd == 0) && !decrypt_input) {
			encrypt_send_request_start();
			enc_passwd = 1;
		} else if (enc_passwd) {
			encrypt_send_request_end();
			enc_passwd = 0;
		}
	}
#endif	/* ENCRYPTION */

	/*
	 * Do echo mode handling as soon as we know what the
	 * linemode is going to be.
	 * If the pty has echo turned off, then tell the client that
	 * the server will echo.  If echo is on, then the server
	 * will echo if in character mode, but in linemode the
	 * client should do local echoing.  The state machine will
	 * not send anything if it is unnecessary, so don't worry
	 * about that here.
	 *
	 * If we need to send the WILL ECHO (because echo is off),
	 * then delay that until after we have changed the MODE.
	 * This way, when the user is turning off both editing
	 * and echo, the client will get editing turned off first.
	 * This keeps the client from going into encryption mode
	 * and then right back out if it is doing auto-encryption
	 * when passwords are being typed.
	 */
	if (uselinemode) {
		if (tty_isecho())
			send_wont(TELOPT_ECHO, 1);
		else
			need_will_echo = 1;
#ifdef	KLUDGELINEMODE
		if (lmodetype == KLUDGE_OK)
			lmodetype = KLUDGE_LINEMODE;
#endif
	}

	/*
	 * If linemode is being turned off, send appropriate
	 * command and then we're all done.
	 */
	 if (!uselinemode && linemode) {
# ifdef	KLUDGELINEMODE
		if (lmodetype == REAL_LINEMODE) {
# endif	/* KLUDGELINEMODE */
			send_dont(TELOPT_LINEMODE, 1);
# ifdef	KLUDGELINEMODE
		} else if (lmodetype == KLUDGE_LINEMODE)
			send_will(TELOPT_SGA, 1);
# endif	/* KLUDGELINEMODE */
		send_will(TELOPT_ECHO, 1);
		linemode = uselinemode;
		goto done;
	}

# ifdef	KLUDGELINEMODE
	/*
	 * If using real linemode check edit modes for possible later use.
	 * If we are in kludge linemode, do the SGA negotiation.
	 */
	if (lmodetype == REAL_LINEMODE) {
# endif	/* KLUDGELINEMODE */
		useeditmode = 0;
		if (tty_isediting())
			useeditmode |= MODE_EDIT;
		if (tty_istrapsig())
			useeditmode |= MODE_TRAPSIG;
		if (tty_issofttab())
			useeditmode |= MODE_SOFT_TAB;
		if (tty_islitecho())
			useeditmode |= MODE_LIT_ECHO;
# ifdef	KLUDGELINEMODE
	} else if (lmodetype == KLUDGE_LINEMODE) {
		if (tty_isediting() && uselinemode)
			send_wont(TELOPT_SGA, 1);
		else
			send_will(TELOPT_SGA, 1);
	}
# endif	/* KLUDGELINEMODE */

	/*
	 * Negotiate linemode on if pty state has changed to turn it on.
	 * Send appropriate command and send along edit mode, then all done.
	 */
	if (uselinemode && !linemode) {
# ifdef	KLUDGELINEMODE
		if (lmodetype == KLUDGE_LINEMODE) {
			send_wont(TELOPT_SGA, 1);
		} else if (lmodetype == REAL_LINEMODE) {
# endif	/* KLUDGELINEMODE */
			send_do(TELOPT_LINEMODE, 1);
			/* send along edit modes */
			output_data("%c%c%c%c%c%c%c", IAC, SB,
				TELOPT_LINEMODE, LM_MODE, useeditmode,
				IAC, SE);
			editmode = useeditmode;
# ifdef	KLUDGELINEMODE
		}
# endif	/* KLUDGELINEMODE */
		linemode = uselinemode;
		goto done;
	}

# ifdef	KLUDGELINEMODE
	/*
	 * None of what follows is of any value if not using
	 * real linemode.
	 */
	if (lmodetype < REAL_LINEMODE)
		goto done;
# endif	/* KLUDGELINEMODE */

	if (linemode && his_state_is_will(TELOPT_LINEMODE)) {
		/*
		 * If edit mode changed, send edit mode.
		 */
		 if (useeditmode != editmode) {
			/*
			 * Send along appropriate edit mode mask.
			 */
			output_data("%c%c%c%c%c%c%c", IAC, SB,
				TELOPT_LINEMODE, LM_MODE, useeditmode,
				IAC, SE);
			editmode = useeditmode;
		}


		/*
		 * Check for changes to special characters in use.
		 */
		start_slc(0);
		check_slc();
		(void) end_slc(0);
	}

done:
	if (need_will_echo)
		send_will(TELOPT_ECHO, 1);
	/*
	 * Some things should be deferred until after the pty state has
	 * been set by the local process.  Do those things that have been
	 * deferred now.  This only happens once.
	 */
	if (_terminit == 0) {
		_terminit = 1;
		defer_terminit();
	}

	netflush();
	set_termbuf();
	return;

}  /* end of localstat */
Beispiel #11
0
void
optionstatus (void)
{
  register int i;
  extern char will_wont_resp[], do_dont_resp[];

  for (i = 0; i < 256; i++)
    {
      if (do_dont_resp[i])
	{
	  if (TELOPT_OK (i))
	    printf ("resp DO_DONT %s: %d\n", TELOPT (i), do_dont_resp[i]);
	  else if (TELCMD_OK (i))
	    printf ("resp DO_DONT %s: %d\n", TELCMD (i), do_dont_resp[i]);
	  else
	    printf ("resp DO_DONT %d: %d\n", i, do_dont_resp[i]);
	  if (my_want_state_is_do (i))
	    {
	      if (TELOPT_OK (i))
		printf ("want DO   %s\n", TELOPT (i));
	      else if (TELCMD_OK (i))
		printf ("want DO   %s\n", TELCMD (i));
	      else
		printf ("want DO   %d\n", i);
	    }
	  else
	    {
	      if (TELOPT_OK (i))
		printf ("want DONT %s\n", TELOPT (i));
	      else if (TELCMD_OK (i))
		printf ("want DONT %s\n", TELCMD (i));
	      else
		printf ("want DONT %d\n", i);
	    }
	}
      else
	{
	  if (my_state_is_do (i))
	    {
	      if (TELOPT_OK (i))
		printf ("     DO   %s\n", TELOPT (i));
	      else if (TELCMD_OK (i))
		printf ("     DO   %s\n", TELCMD (i));
	      else
		printf ("     DO   %d\n", i);
	    }
	}
      if (will_wont_resp[i])
	{
	  if (TELOPT_OK (i))
	    printf ("resp WILL_WONT %s: %d\n", TELOPT (i), will_wont_resp[i]);
	  else if (TELCMD_OK (i))
	    printf ("resp WILL_WONT %s: %d\n", TELCMD (i), will_wont_resp[i]);
	  else
	    printf ("resp WILL_WONT %d: %d\n", i, will_wont_resp[i]);
	  if (my_want_state_is_will (i))
	    {
	      if (TELOPT_OK (i))
		printf ("want WILL %s\n", TELOPT (i));
	      else if (TELCMD_OK (i))
		printf ("want WILL %s\n", TELCMD (i));
	      else
		printf ("want WILL %d\n", i);
	    }
	  else
	    {
	      if (TELOPT_OK (i))
		printf ("want WONT %s\n", TELOPT (i));
	      else if (TELCMD_OK (i))
		printf ("want WONT %s\n", TELCMD (i));
	      else
		printf ("want WONT %d\n", i);
	    }
	}
      else
	{
	  if (my_state_is_will (i))
	    {
	      if (TELOPT_OK (i))
		printf ("     WILL %s\n", TELOPT (i));
	      else if (TELCMD_OK (i))
		printf ("     WILL %s\n", TELCMD (i));
	      else
		printf ("     WILL %d\n", i);
	    }
	}
    }

}
Beispiel #12
0
void dontoption(int option) {
    /*
     * Process client input.
     */
    DIAG(TD_OPTIONS, printoption("td: recv dont", option));

    if (will_wont_resp[option]) {
        will_wont_resp[option]--;
        if (will_wont_resp[option] && my_state_is_wont(option))
            will_wont_resp[option]--;
    }
    if ((will_wont_resp[option] == 0) && (my_want_state_is_will(option))) {
        switch (option) {
        case TELOPT_BINARY:
            init_termbuf();
            tty_binaryout(0);
            set_termbuf();
            break;

        case TELOPT_ECHO:	/* we should stop echoing */
#ifdef	LINEMODE
#ifdef	KLUDGELINEMODE
            if (lmodetype == NO_LINEMODE)
#else
            if (his_state_is_wont(TELOPT_LINEMODE))
#endif
#endif
            {
                init_termbuf();
                tty_setecho(0);
                set_termbuf();
            }
            break;

        case TELOPT_SGA:
#if defined(LINEMODE) && defined(KLUDGELINEMODE)
            /*
             * If kludge linemode is in use, then we
             * must process an incoming do SGA for
             * linemode purposes.
             */
            if (lmodetype == KLUDGE_LINEMODE) {
                /*
                 * The client is asking us to turn
                 * linemode on.
                 */
                clientstat(TELOPT_LINEMODE, WILL, 0);
                /*
                 * If we did not turn line mode on,
                 * then what do we say?  Will SGA?
                 * This violates design of telnet.
                 * Gross.  Very Gross.
                 */
            }
            break;
#else
            set_my_want_state_wont(option);
            if (my_state_is_will(option))
                send_wont(option, 0);
            set_my_state_wont(option);
            if (turn_on_sga ^= 1) send_will(option,1);
            return;
#endif	/* defined(LINEMODE) && defined(KLUDGELINEMODE) */

        default:
            break;
        }

        set_my_want_state_wont(option);
        if (my_state_is_will(option))
            send_wont(option, 0);
    }
    set_my_state_wont(option);
}
Beispiel #13
0
/*
 * localstat
 *
 * This function handles all management of linemode.
 *
 * Linemode allows the client to do the local editing of data
 * and send only complete lines to the server.  Linemode state is
 * based on the state of the pty driver.  If the pty is set for
 * external processing, then we can use linemode.  Further, if we
 * can use real linemode, then we can look at the edit control bits
 * in the pty to determine what editing the client should do.
 *
 * Linemode support uses the following state flags to keep track of
 * current and desired linemode state.
 *	alwayslinemode : true if -l was specified on the telnetd
 * 	command line.  It means to have linemode on as much as
 *	possible.
 *
 * 	lmodetype: signifies whether the client can
 *	handle real linemode, or if use of kludgeomatic linemode
 *	is preferred.  It will be set to one of the following:
 *		REAL_LINEMODE : use linemode option
 *		NO_KLUDGE : don't initiate kludge linemode.
 *		KLUDGE_LINEMODE : use kludge linemode
 *		NO_LINEMODE : client is ignorant of linemode
 *
 *	linemode, uselinemode : linemode is true if linemode
 *	is currently on, uselinemode is the state that we wish
 *	to be in.  If another function wishes to turn linemode
 *	on or off, it sets or clears uselinemode.
 *
 *	editmode, useeditmode : like linemode/uselinemode, but
 *	these contain the edit mode states (edit and trapsig).
 *
 * The state variables correspond to some of the state information
 * in the pty.
 *	linemode:
 *		In real linemode, this corresponds to whether the pty
 *		expects external processing of incoming data.
 *		In kludge linemode, this more closely corresponds to the
 *		whether normal processing is on or not.  (ICANON in
 *		system V, or COOKED mode in BSD.)
 *		If the -l option was specified (alwayslinemode), then
 *		an attempt is made to force external processing on at
 *		all times.
 *
 * The following heuristics are applied to determine linemode
 * handling within the server.
 *	1) Early on in starting up the server, an attempt is made
 *	   to negotiate the linemode option.  If this succeeds
 *	   then lmodetype is set to REAL_LINEMODE and all linemode
 *	   processing occurs in the context of the linemode option.
 *	2) If the attempt to negotiate the linemode option failed,
 *	   and the "-k" (don't initiate kludge linemode) isn't set,
 *	   then we try to use kludge linemode.  We test for this
 *	   capability by sending "do Timing Mark".  If a positive
 *	   response comes back, then we assume that the client
 *	   understands kludge linemode (ech!) and the
 *	   lmodetype flag is set to KLUDGE_LINEMODE.
 *	3) Otherwise, linemode is not supported at all and
 *	   lmodetype remains set to NO_LINEMODE (which happens
 *	   to be 0 for convenience).
 *	4) At any time a command arrives that implies a higher
 *	   state of linemode support in the client, we move to that
 *	   linemode support.
 *
 * A short explanation of kludge linemode is in order here.
 *	1) The heuristic to determine support for kludge linemode
 *	   is to send a do timing mark.  We assume that a client
 *	   that supports timing marks also supports kludge linemode.
 *	   A risky proposition at best.
 *	2) Further negotiation of linemode is done by changing the
 *	   the server's state regarding SGA.  If server will SGA,
 *	   then linemode is off, if server won't SGA, then linemode
 *	   is on.
 */
	void
localstat()
{
	int need_will_echo = 0;

#if	defined(CRAY2) && defined(UNICOS5)
	/*
	 * Keep track of that ol' CR/NL mapping while we're in the
	 * neighborhood.
	 */
	newmap = tty_isnewmap();
#endif	/* defined(CRAY2) && defined(UNICOS5) */

	/*
	 * Check for state of BINARY options.
	 */
	if (tty_isbinaryin()) {
		if (his_want_state_is_wont(TELOPT_BINARY))
			send_do(TELOPT_BINARY, 1);
	} else {
		if (his_want_state_is_will(TELOPT_BINARY))
			send_dont(TELOPT_BINARY, 1);
	}

	if (tty_isbinaryout()) {
		if (my_want_state_is_wont(TELOPT_BINARY))
			send_will(TELOPT_BINARY, 1);
	} else {
		if (my_want_state_is_will(TELOPT_BINARY))
			send_wont(TELOPT_BINARY, 1);
	}

	/*
	 * Check for changes to flow control if client supports it.
	 */
	flowstat();

	/*
	 * Check linemode on/off state
	 */
	uselinemode = tty_linemode();

	/*
	 * If alwayslinemode is on, and pty is changing to turn it off, then
	 * force linemode back on.
	 */
	if (alwayslinemode && linemode && !uselinemode) {
		uselinemode = 1;
		tty_setlinemode(uselinemode);
	}


	/*
	 * Do echo mode handling as soon as we know what the
	 * linemode is going to be.
	 * If the pty has echo turned off, then tell the client that
	 * the server will echo.  If echo is on, then the server
	 * will echo if in character mode, but in linemode the
	 * client should do local echoing.  The state machine will
	 * not send anything if it is unnecessary, so don't worry
	 * about that here.
	 *
	 * If we need to send the WILL ECHO (because echo is off),
	 * then delay that until after we have changed the MODE.
	 * This way, when the user is turning off both editing
	 * and echo, the client will get editing turned off first.
	 * This keeps the client from going into encryption mode
	 * and then right back out if it is doing auto-encryption
	 * when passwords are being typed.
	 */
	if (uselinemode) {
		if (tty_isecho())
			send_wont(TELOPT_ECHO, 1);
		else
			need_will_echo = 1;
#ifdef	KLUDGELINEMODE
		if (lmodetype == KLUDGE_OK)
			lmodetype = KLUDGE_LINEMODE;
#endif
	}

	/*
	 * If linemode is being turned off, send appropriate
	 * command and then we're all done.
	 */
	 if (!uselinemode && linemode) {
# ifdef	KLUDGELINEMODE
		if (lmodetype == REAL_LINEMODE) {
# endif	/* KLUDGELINEMODE */
			send_dont(TELOPT_LINEMODE, 1);
# ifdef	KLUDGELINEMODE
		} else if (lmodetype == KLUDGE_LINEMODE)
			send_will(TELOPT_SGA, 1);
# endif	/* KLUDGELINEMODE */
		send_will(TELOPT_ECHO, 1);
		linemode = uselinemode;
		goto done;
	}

# ifdef	KLUDGELINEMODE
	/*
	 * If using real linemode check edit modes for possible later use.
	 * If we are in kludge linemode, do the SGA negotiation.
	 */
	if (lmodetype == REAL_LINEMODE) {
# endif	/* KLUDGELINEMODE */
		useeditmode = 0;
		if (tty_isediting())
			useeditmode |= MODE_EDIT;
		if (tty_istrapsig())
			useeditmode |= MODE_TRAPSIG;
		if (tty_issofttab())
			useeditmode |= MODE_SOFT_TAB;
		if (tty_islitecho())
			useeditmode |= MODE_LIT_ECHO;
# ifdef	KLUDGELINEMODE
	} else if (lmodetype == KLUDGE_LINEMODE) {
		if (tty_isediting() && uselinemode)
			send_wont(TELOPT_SGA, 1);
		else
			send_will(TELOPT_SGA, 1);
	}
# endif	/* KLUDGELINEMODE */

	/*
	 * Negotiate linemode on if pty state has changed to turn it on.
	 * Send appropriate command and send along edit mode, then all done.
	 */
	if (uselinemode && !linemode) {
# ifdef	KLUDGELINEMODE
		if (lmodetype == KLUDGE_LINEMODE) {
			send_wont(TELOPT_SGA, 1);
		} else if (lmodetype == REAL_LINEMODE) {
# endif	/* KLUDGELINEMODE */
			send_do(TELOPT_LINEMODE, 1);
			/* send along edit modes */
			(void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
				TELOPT_LINEMODE, LM_MODE, useeditmode,
				IAC, SE);
			nfrontp += 7;
			editmode = useeditmode;
# ifdef	KLUDGELINEMODE
		}
# endif	/* KLUDGELINEMODE */
		linemode = uselinemode;
		goto done;
	}

# ifdef	KLUDGELINEMODE
	/*
	 * None of what follows is of any value if not using
	 * real linemode.
	 */
	if (lmodetype < REAL_LINEMODE)
		goto done;
# endif	/* KLUDGELINEMODE */

	if (linemode && his_state_is_will(TELOPT_LINEMODE)) {
		/*
		 * If edit mode changed, send edit mode.
		 */
		 if (useeditmode != editmode) {
			/*
			 * Send along appropriate edit mode mask.
			 */
			(void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
				TELOPT_LINEMODE, LM_MODE, useeditmode,
				IAC, SE);
			nfrontp += 7;
			editmode = useeditmode;
		}


		/*
		 * Check for changes to special characters in use.
		 */
		start_slc(0);
		check_slc();
		(void) end_slc(0);
	}

done:
	if (need_will_echo)
		send_will(TELOPT_ECHO, 1);
	/*
	 * Some things should be deferred until after the pty state has
	 * been set by the local process.  Do those things that have been
	 * deferred now.  This only happens once.
	 */
	if (_terminit == 0) {
		_terminit = 1;
		defer_terminit();
	}

	netflush();
	set_termbuf();
	return;

}  /* end of localstat */