2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static char sccsid[] = "@(#)termstat.c 8.1 (Berkeley) 6/4/93";
38 static const char rcsid[] =
47 int def_tspeed = -1, def_rspeed = -1;
49 int def_row = 0, def_col = 0;
52 static int _terminit = 0;
55 #if defined(CRAY2) && defined(UNICOS5)
56 int newmap = 1; /* nonzero if \n maps to ^M^J */
63 * This function handles all management of linemode.
65 * Linemode allows the client to do the local editing of data
66 * and send only complete lines to the server. Linemode state is
67 * based on the state of the pty driver. If the pty is set for
68 * external processing, then we can use linemode. Further, if we
69 * can use real linemode, then we can look at the edit control bits
70 * in the pty to determine what editing the client should do.
72 * Linemode support uses the following state flags to keep track of
73 * current and desired linemode state.
74 * alwayslinemode : true if -l was specified on the telnetd
75 * command line. It means to have linemode on as much as
78 * lmodetype: signifies whether the client can
79 * handle real linemode, or if use of kludgeomatic linemode
80 * is preferred. It will be set to one of the following:
81 * REAL_LINEMODE : use linemode option
82 * NO_KLUDGE : don't initiate kludge linemode.
83 * KLUDGE_LINEMODE : use kludge linemode
84 * NO_LINEMODE : client is ignorant of linemode
86 * linemode, uselinemode : linemode is true if linemode
87 * is currently on, uselinemode is the state that we wish
88 * to be in. If another function wishes to turn linemode
89 * on or off, it sets or clears uselinemode.
91 * editmode, useeditmode : like linemode/uselinemode, but
92 * these contain the edit mode states (edit and trapsig).
94 * The state variables correspond to some of the state information
97 * In real linemode, this corresponds to whether the pty
98 * expects external processing of incoming data.
99 * In kludge linemode, this more closely corresponds to the
100 * whether normal processing is on or not. (ICANON in
101 * system V, or COOKED mode in BSD.)
102 * If the -l option was specified (alwayslinemode), then
103 * an attempt is made to force external processing on at
106 * The following heuristics are applied to determine linemode
107 * handling within the server.
108 * 1) Early on in starting up the server, an attempt is made
109 * to negotiate the linemode option. If this succeeds
110 * then lmodetype is set to REAL_LINEMODE and all linemode
111 * processing occurs in the context of the linemode option.
112 * 2) If the attempt to negotiate the linemode option failed,
113 * and the "-k" (don't initiate kludge linemode) isn't set,
114 * then we try to use kludge linemode. We test for this
115 * capability by sending "do Timing Mark". If a positive
116 * response comes back, then we assume that the client
117 * understands kludge linemode (ech!) and the
118 * lmodetype flag is set to KLUDGE_LINEMODE.
119 * 3) Otherwise, linemode is not supported at all and
120 * lmodetype remains set to NO_LINEMODE (which happens
121 * to be 0 for convenience).
122 * 4) At any time a command arrives that implies a higher
123 * state of linemode support in the client, we move to that
126 * A short explanation of kludge linemode is in order here.
127 * 1) The heuristic to determine support for kludge linemode
128 * is to send a do timing mark. We assume that a client
129 * that supports timing marks also supports kludge linemode.
130 * A risky proposition at best.
131 * 2) Further negotiation of linemode is done by changing the
132 * the server's state regarding SGA. If server will SGA,
133 * then linemode is off, if server won't SGA, then linemode
140 int need_will_echo = 0;
142 #if defined(CRAY2) && defined(UNICOS5)
144 * Keep track of that ol' CR/NL mapping while we're in the
147 newmap = tty_isnewmap();
148 #endif /* defined(CRAY2) && defined(UNICOS5) */
151 * Check for changes to flow control if client supports it.
156 * Check linemode on/off state
158 uselinemode = tty_linemode();
161 * If alwayslinemode is on, and pty is changing to turn it off, then
162 * force linemode back on.
164 if (alwayslinemode && linemode && !uselinemode) {
166 tty_setlinemode(uselinemode);
172 * Check for state of BINARY options.
174 * We only need to do the binary dance if we are actually going
175 * to use linemode. As this confuses some telnet clients that dont
176 * support linemode, and doesnt gain us anything, we dont do it
177 * unless we're doing linemode. -Crh (henrich@msu.edu)
180 if (tty_isbinaryin()) {
181 if (his_want_state_is_wont(TELOPT_BINARY))
182 send_do(TELOPT_BINARY, 1);
184 if (his_want_state_is_will(TELOPT_BINARY))
185 send_dont(TELOPT_BINARY, 1);
188 if (tty_isbinaryout()) {
189 if (my_want_state_is_wont(TELOPT_BINARY))
190 send_will(TELOPT_BINARY, 1);
192 if (my_want_state_is_will(TELOPT_BINARY))
193 send_wont(TELOPT_BINARY, 1);
199 * Do echo mode handling as soon as we know what the
200 * linemode is going to be.
201 * If the pty has echo turned off, then tell the client that
202 * the server will echo. If echo is on, then the server
203 * will echo if in character mode, but in linemode the
204 * client should do local echoing. The state machine will
205 * not send anything if it is unnecessary, so don't worry
208 * If we need to send the WILL ECHO (because echo is off),
209 * then delay that until after we have changed the MODE.
210 * This way, when the user is turning off both editing
211 * and echo, the client will get editing turned off first.
212 * This keeps the client from going into encryption mode
213 * and then right back out if it is doing auto-encryption
214 * when passwords are being typed.
218 send_wont(TELOPT_ECHO, 1);
221 #ifdef KLUDGELINEMODE
222 if (lmodetype == KLUDGE_OK)
223 lmodetype = KLUDGE_LINEMODE;
228 * If linemode is being turned off, send appropriate
229 * command and then we're all done.
231 if (!uselinemode && linemode) {
232 # ifdef KLUDGELINEMODE
233 if (lmodetype == REAL_LINEMODE) {
234 # endif /* KLUDGELINEMODE */
235 send_dont(TELOPT_LINEMODE, 1);
236 # ifdef KLUDGELINEMODE
237 } else if (lmodetype == KLUDGE_LINEMODE)
238 send_will(TELOPT_SGA, 1);
239 # endif /* KLUDGELINEMODE */
240 send_will(TELOPT_ECHO, 1);
241 linemode = uselinemode;
245 # ifdef KLUDGELINEMODE
247 * If using real linemode check edit modes for possible later use.
248 * If we are in kludge linemode, do the SGA negotiation.
250 if (lmodetype == REAL_LINEMODE) {
251 # endif /* KLUDGELINEMODE */
254 useeditmode |= MODE_EDIT;
256 useeditmode |= MODE_TRAPSIG;
258 useeditmode |= MODE_SOFT_TAB;
260 useeditmode |= MODE_LIT_ECHO;
261 # ifdef KLUDGELINEMODE
262 } else if (lmodetype == KLUDGE_LINEMODE) {
263 if (tty_isediting() && uselinemode)
264 send_wont(TELOPT_SGA, 1);
266 send_will(TELOPT_SGA, 1);
268 # endif /* KLUDGELINEMODE */
271 * Negotiate linemode on if pty state has changed to turn it on.
272 * Send appropriate command and send along edit mode, then all done.
274 if (uselinemode && !linemode) {
275 # ifdef KLUDGELINEMODE
276 if (lmodetype == KLUDGE_LINEMODE) {
277 send_wont(TELOPT_SGA, 1);
278 } else if (lmodetype == REAL_LINEMODE) {
279 # endif /* KLUDGELINEMODE */
280 send_do(TELOPT_LINEMODE, 1);
281 /* send along edit modes */
282 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
283 TELOPT_LINEMODE, LM_MODE, useeditmode,
286 editmode = useeditmode;
287 # ifdef KLUDGELINEMODE
289 # endif /* KLUDGELINEMODE */
290 linemode = uselinemode;
294 # ifdef KLUDGELINEMODE
296 * None of what follows is of any value if not using
299 if (lmodetype < REAL_LINEMODE)
301 # endif /* KLUDGELINEMODE */
303 if (linemode && his_state_is_will(TELOPT_LINEMODE)) {
305 * If edit mode changed, send edit mode.
307 if (useeditmode != editmode) {
309 * Send along appropriate edit mode mask.
311 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
312 TELOPT_LINEMODE, LM_MODE, useeditmode,
315 editmode = useeditmode;
320 * Check for changes to special characters in use.
329 send_will(TELOPT_ECHO, 1);
331 * Some things should be deferred until after the pty state has
332 * been set by the local process. Do those things that have been
333 * deferred now. This only happens once.
335 if (_terminit == 0) {
344 } /* end of localstat */
345 #endif /* LINEMODE */
350 * Check for changes to flow control
355 if (his_state_is_will(TELOPT_LFLOW)) {
356 if (tty_flowmode() != flowmode) {
357 flowmode = tty_flowmode();
358 (void) sprintf(nfrontp, "%c%c%c%c%c%c",
359 IAC, SB, TELOPT_LFLOW,
360 flowmode ? LFLOW_ON : LFLOW_OFF,
364 if (tty_restartany() != restartany) {
365 restartany = tty_restartany();
366 (void) sprintf(nfrontp, "%c%c%c%c%c%c",
367 IAC, SB, TELOPT_LFLOW,
368 restartany ? LFLOW_RESTART_ANY
379 * Process linemode related requests from the client.
380 * Client can request a change to only one of linemode, editmode or slc's
381 * at a time, and if using kludge linemode, then only linemode may be
385 clientstat(code, parm1, parm2)
386 register int code, parm1, parm2;
391 * Get a copy of terminal characteristics.
396 * Process request from client. code tells what it is.
400 case TELOPT_LINEMODE:
402 * Don't do anything unless client is asking us to change
405 uselinemode = (parm1 == WILL);
406 if (uselinemode != linemode) {
407 # ifdef KLUDGELINEMODE
409 * If using kludge linemode, make sure that
410 * we can do what the client asks.
411 * We can not turn off linemode if alwayslinemode
412 * and the ICANON bit is set.
414 if (lmodetype == KLUDGE_LINEMODE) {
415 if (alwayslinemode && tty_isediting()) {
421 * Quit now if we can't do it.
423 if (uselinemode == linemode)
427 * If using real linemode and linemode is being
428 * turned on, send along the edit mode mask.
430 if (lmodetype == REAL_LINEMODE && uselinemode)
431 # else /* KLUDGELINEMODE */
433 # endif /* KLUDGELINEMODE */
437 useeditmode |= MODE_EDIT;
439 useeditmode |= MODE_TRAPSIG;
441 useeditmode |= MODE_SOFT_TAB;
443 useeditmode |= MODE_LIT_ECHO;
444 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
445 SB, TELOPT_LINEMODE, LM_MODE,
446 useeditmode, IAC, SE);
448 editmode = useeditmode;
452 tty_setlinemode(uselinemode);
454 linemode = uselinemode;
457 send_will(TELOPT_ECHO, 1);
463 register int ack, changed;
466 * Client has sent along a mode mask. If it agrees with
467 * what we are currently doing, ignore it; if not, it could
468 * be viewed as a request to change. Note that the server
469 * will change to the modes in an ack if it is different from
470 * what we currently have, but we will not ack the ack.
472 useeditmode &= MODE_MASK;
473 ack = (useeditmode & MODE_ACK);
474 useeditmode &= ~MODE_ACK;
476 if ((changed = (useeditmode ^ editmode))) {
478 * This check is for a timing problem. If the
479 * state of the tty has changed (due to the user
480 * application) we need to process that info
481 * before we write in the state contained in the
482 * ack!!! This gets out the new MODE request,
483 * and when the ack to that command comes back
484 * we'll set it and be in the right mode.
488 if (changed & MODE_EDIT)
489 tty_setedit(useeditmode & MODE_EDIT);
491 if (changed & MODE_TRAPSIG)
492 tty_setsig(useeditmode & MODE_TRAPSIG);
494 if (changed & MODE_SOFT_TAB)
495 tty_setsofttab(useeditmode & MODE_SOFT_TAB);
497 if (changed & MODE_LIT_ECHO)
498 tty_setlitecho(useeditmode & MODE_LIT_ECHO);
503 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
504 SB, TELOPT_LINEMODE, LM_MODE,
505 useeditmode|MODE_ACK,
510 editmode = useeditmode;
515 } /* end of case LM_MODE */
516 #endif /* LINEMODE */
527 * Defer changing window size until after terminal is
532 #endif /* LINEMODE */
535 * Change window size as requested by client.
540 (void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
542 #endif /* TIOCSWINSZ */
552 * Defer changing the terminal speed.
556 #endif /* LINEMODE */
558 * Change terminal speed as requested by client.
559 * We set the receive speed first, so that if we can't
560 * store seperate receive and transmit speeds, the transmit
561 * speed will take precedence.
569 } /* end of case TELOPT_TSPEED */
574 } /* end of switch */
576 #if defined(CRAY2) && defined(UNICOS5)
578 * Just in case of the likely event that we changed the pty state.
581 #endif /* defined(CRAY2) && defined(UNICOS5) */
585 } /* end of clientstat */
587 #if defined(CRAY2) && defined(UNICOS5)
602 #endif /* defined(CRAY2) && defined(UNICOS5) */
608 * Some things should not be done until after the login process has started
609 * and all the pty modes are set to what they are supposed to be. This
610 * function is called when the pty state has been processed for the first time.
611 * It calls other functions that do things that were deferred in each module.
618 * local stuff that got deferred.
620 if (def_tspeed != -1) {
621 clientstat(TELOPT_TSPEED, def_tspeed, def_rspeed);
622 def_tspeed = def_rspeed = 0;
626 if (def_col || def_row) {
629 bzero((char *)&ws, sizeof(ws));
632 (void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
637 * The only other module that currently defers anything.
641 } /* end of defer_terminit */
646 * Returns true if the pty state has been processed yet.
653 } /* end of terminit */
654 #endif /* LINEMODE */