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
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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
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static char sccsid[] = "@(#)termstat.c 8.1 (Berkeley) 6/4/93";
43 int def_tspeed = -1, def_rspeed = -1;
45 int def_row = 0, def_col = 0;
48 static int _terminit = 0;
51 #if defined(CRAY2) && defined(UNICOS5)
52 int newmap = 1; /* nonzero if \n maps to ^M^J */
59 * This function handles all management of linemode.
61 * Linemode allows the client to do the local editing of data
62 * and send only complete lines to the server. Linemode state is
63 * based on the state of the pty driver. If the pty is set for
64 * external processing, then we can use linemode. Further, if we
65 * can use real linemode, then we can look at the edit control bits
66 * in the pty to determine what editing the client should do.
68 * Linemode support uses the following state flags to keep track of
69 * current and desired linemode state.
70 * alwayslinemode : true if -l was specified on the telnetd
71 * command line. It means to have linemode on as much as
74 * lmodetype: signifies whether the client can
75 * handle real linemode, or if use of kludgeomatic linemode
76 * is preferred. It will be set to one of the following:
77 * REAL_LINEMODE : use linemode option
78 * NO_KLUDGE : don't initiate kludge linemode.
79 * KLUDGE_LINEMODE : use kludge linemode
80 * NO_LINEMODE : client is ignorant of linemode
82 * linemode, uselinemode : linemode is true if linemode
83 * is currently on, uselinemode is the state that we wish
84 * to be in. If another function wishes to turn linemode
85 * on or off, it sets or clears uselinemode.
87 * editmode, useeditmode : like linemode/uselinemode, but
88 * these contain the edit mode states (edit and trapsig).
90 * The state variables correspond to some of the state information
93 * In real linemode, this corresponds to whether the pty
94 * expects external processing of incoming data.
95 * In kludge linemode, this more closely corresponds to the
96 * whether normal processing is on or not. (ICANON in
97 * system V, or COOKED mode in BSD.)
98 * If the -l option was specified (alwayslinemode), then
99 * an attempt is made to force external processing on at
102 * The following heuristics are applied to determine linemode
103 * handling within the server.
104 * 1) Early on in starting up the server, an attempt is made
105 * to negotiate the linemode option. If this succeeds
106 * then lmodetype is set to REAL_LINEMODE and all linemode
107 * processing occurs in the context of the linemode option.
108 * 2) If the attempt to negotiate the linemode option failed,
109 * and the "-k" (don't initiate kludge linemode) isn't set,
110 * then we try to use kludge linemode. We test for this
111 * capability by sending "do Timing Mark". If a positive
112 * response comes back, then we assume that the client
113 * understands kludge linemode (ech!) and the
114 * lmodetype flag is set to KLUDGE_LINEMODE.
115 * 3) Otherwise, linemode is not supported at all and
116 * lmodetype remains set to NO_LINEMODE (which happens
117 * to be 0 for convenience).
118 * 4) At any time a command arrives that implies a higher
119 * state of linemode support in the client, we move to that
122 * A short explanation of kludge linemode is in order here.
123 * 1) The heuristic to determine support for kludge linemode
124 * is to send a do timing mark. We assume that a client
125 * that supports timing marks also supports kludge linemode.
126 * A risky proposition at best.
127 * 2) Further negotiation of linemode is done by changing the
128 * the server's state regarding SGA. If server will SGA,
129 * then linemode is off, if server won't SGA, then linemode
136 int need_will_echo = 0;
138 #if defined(CRAY2) && defined(UNICOS5)
140 * Keep track of that ol' CR/NL mapping while we're in the
143 newmap = tty_isnewmap();
144 #endif /* defined(CRAY2) && defined(UNICOS5) */
147 * Check for state of BINARY options.
149 if (tty_isbinaryin()) {
150 if (his_want_state_is_wont(TELOPT_BINARY))
151 send_do(TELOPT_BINARY, 1);
153 if (his_want_state_is_will(TELOPT_BINARY))
154 send_dont(TELOPT_BINARY, 1);
157 if (tty_isbinaryout()) {
158 if (my_want_state_is_wont(TELOPT_BINARY))
159 send_will(TELOPT_BINARY, 1);
161 if (my_want_state_is_will(TELOPT_BINARY))
162 send_wont(TELOPT_BINARY, 1);
166 * Check for changes to flow control if client supports it.
171 * Check linemode on/off state
173 uselinemode = tty_linemode();
176 * If alwayslinemode is on, and pty is changing to turn it off, then
177 * force linemode back on.
179 if (alwayslinemode && linemode && !uselinemode) {
181 tty_setlinemode(uselinemode);
186 * Do echo mode handling as soon as we know what the
187 * linemode is going to be.
188 * If the pty has echo turned off, then tell the client that
189 * the server will echo. If echo is on, then the server
190 * will echo if in character mode, but in linemode the
191 * client should do local echoing. The state machine will
192 * not send anything if it is unnecessary, so don't worry
195 * If we need to send the WILL ECHO (because echo is off),
196 * then delay that until after we have changed the MODE.
197 * This way, when the user is turning off both editing
198 * and echo, the client will get editing turned off first.
199 * This keeps the client from going into encryption mode
200 * and then right back out if it is doing auto-encryption
201 * when passwords are being typed.
205 send_wont(TELOPT_ECHO, 1);
208 #ifdef KLUDGELINEMODE
209 if (lmodetype == KLUDGE_OK)
210 lmodetype = KLUDGE_LINEMODE;
215 * If linemode is being turned off, send appropriate
216 * command and then we're all done.
218 if (!uselinemode && linemode) {
219 # ifdef KLUDGELINEMODE
220 if (lmodetype == REAL_LINEMODE) {
221 # endif /* KLUDGELINEMODE */
222 send_dont(TELOPT_LINEMODE, 1);
223 # ifdef KLUDGELINEMODE
224 } else if (lmodetype == KLUDGE_LINEMODE)
225 send_will(TELOPT_SGA, 1);
226 # endif /* KLUDGELINEMODE */
227 send_will(TELOPT_ECHO, 1);
228 linemode = uselinemode;
232 # ifdef KLUDGELINEMODE
234 * If using real linemode check edit modes for possible later use.
235 * If we are in kludge linemode, do the SGA negotiation.
237 if (lmodetype == REAL_LINEMODE) {
238 # endif /* KLUDGELINEMODE */
241 useeditmode |= MODE_EDIT;
243 useeditmode |= MODE_TRAPSIG;
245 useeditmode |= MODE_SOFT_TAB;
247 useeditmode |= MODE_LIT_ECHO;
248 # ifdef KLUDGELINEMODE
249 } else if (lmodetype == KLUDGE_LINEMODE) {
250 if (tty_isediting() && uselinemode)
251 send_wont(TELOPT_SGA, 1);
253 send_will(TELOPT_SGA, 1);
255 # endif /* KLUDGELINEMODE */
258 * Negotiate linemode on if pty state has changed to turn it on.
259 * Send appropriate command and send along edit mode, then all done.
261 if (uselinemode && !linemode) {
262 # ifdef KLUDGELINEMODE
263 if (lmodetype == KLUDGE_LINEMODE) {
264 send_wont(TELOPT_SGA, 1);
265 } else if (lmodetype == REAL_LINEMODE) {
266 # endif /* KLUDGELINEMODE */
267 send_do(TELOPT_LINEMODE, 1);
268 /* send along edit modes */
269 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
270 TELOPT_LINEMODE, LM_MODE, useeditmode,
273 editmode = useeditmode;
274 # ifdef KLUDGELINEMODE
276 # endif /* KLUDGELINEMODE */
277 linemode = uselinemode;
281 # ifdef KLUDGELINEMODE
283 * None of what follows is of any value if not using
286 if (lmodetype < REAL_LINEMODE)
288 # endif /* KLUDGELINEMODE */
290 if (linemode && his_state_is_will(TELOPT_LINEMODE)) {
292 * If edit mode changed, send edit mode.
294 if (useeditmode != editmode) {
296 * Send along appropriate edit mode mask.
298 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
299 TELOPT_LINEMODE, LM_MODE, useeditmode,
302 editmode = useeditmode;
307 * Check for changes to special characters in use.
316 send_will(TELOPT_ECHO, 1);
318 * Some things should be deferred until after the pty state has
319 * been set by the local process. Do those things that have been
320 * deferred now. This only happens once.
322 if (_terminit == 0) {
331 } /* end of localstat */
332 #endif /* LINEMODE */
337 * Check for changes to flow control
342 if (his_state_is_will(TELOPT_LFLOW)) {
343 if (tty_flowmode() != flowmode) {
344 flowmode = tty_flowmode();
345 (void) sprintf(nfrontp, "%c%c%c%c%c%c",
346 IAC, SB, TELOPT_LFLOW,
347 flowmode ? LFLOW_ON : LFLOW_OFF,
351 if (tty_restartany() != restartany) {
352 restartany = tty_restartany();
353 (void) sprintf(nfrontp, "%c%c%c%c%c%c",
354 IAC, SB, TELOPT_LFLOW,
355 restartany ? LFLOW_RESTART_ANY
366 * Process linemode related requests from the client.
367 * Client can request a change to only one of linemode, editmode or slc's
368 * at a time, and if using kludge linemode, then only linemode may be
372 clientstat(code, parm1, parm2)
373 register int code, parm1, parm2;
378 * Get a copy of terminal characteristics.
383 * Process request from client. code tells what it is.
387 case TELOPT_LINEMODE:
389 * Don't do anything unless client is asking us to change
392 uselinemode = (parm1 == WILL);
393 if (uselinemode != linemode) {
394 # ifdef KLUDGELINEMODE
396 * If using kludge linemode, make sure that
397 * we can do what the client asks.
398 * We can not turn off linemode if alwayslinemode
399 * and the ICANON bit is set.
401 if (lmodetype == KLUDGE_LINEMODE) {
402 if (alwayslinemode && tty_isediting()) {
408 * Quit now if we can't do it.
410 if (uselinemode == linemode)
414 * If using real linemode and linemode is being
415 * turned on, send along the edit mode mask.
417 if (lmodetype == REAL_LINEMODE && uselinemode)
418 # else /* KLUDGELINEMODE */
420 # endif /* KLUDGELINEMODE */
424 useeditmode |= MODE_EDIT;
426 useeditmode |= MODE_TRAPSIG;
428 useeditmode |= MODE_SOFT_TAB;
430 useeditmode |= MODE_LIT_ECHO;
431 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
432 SB, TELOPT_LINEMODE, LM_MODE,
433 useeditmode, IAC, SE);
435 editmode = useeditmode;
439 tty_setlinemode(uselinemode);
441 linemode = uselinemode;
444 send_will(TELOPT_ECHO, 1);
450 register int ack, changed;
453 * Client has sent along a mode mask. If it agrees with
454 * what we are currently doing, ignore it; if not, it could
455 * be viewed as a request to change. Note that the server
456 * will change to the modes in an ack if it is different from
457 * what we currently have, but we will not ack the ack.
459 useeditmode &= MODE_MASK;
460 ack = (useeditmode & MODE_ACK);
461 useeditmode &= ~MODE_ACK;
463 if (changed = (useeditmode ^ editmode)) {
465 * This check is for a timing problem. If the
466 * state of the tty has changed (due to the user
467 * application) we need to process that info
468 * before we write in the state contained in the
469 * ack!!! This gets out the new MODE request,
470 * and when the ack to that command comes back
471 * we'll set it and be in the right mode.
475 if (changed & MODE_EDIT)
476 tty_setedit(useeditmode & MODE_EDIT);
478 if (changed & MODE_TRAPSIG)
479 tty_setsig(useeditmode & MODE_TRAPSIG);
481 if (changed & MODE_SOFT_TAB)
482 tty_setsofttab(useeditmode & MODE_SOFT_TAB);
484 if (changed & MODE_LIT_ECHO)
485 tty_setlitecho(useeditmode & MODE_LIT_ECHO);
490 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
491 SB, TELOPT_LINEMODE, LM_MODE,
492 useeditmode|MODE_ACK,
497 editmode = useeditmode;
502 } /* end of case LM_MODE */
503 #endif /* LINEMODE */
514 * Defer changing window size until after terminal is
519 #endif /* LINEMODE */
522 * Change window size as requested by client.
527 (void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
529 #endif /* TIOCSWINSZ */
539 * Defer changing the terminal speed.
543 #endif /* LINEMODE */
545 * Change terminal speed as requested by client.
546 * We set the receive speed first, so that if we can't
547 * store seperate receive and transmit speeds, the transmit
548 * speed will take precedence.
556 } /* end of case TELOPT_TSPEED */
561 } /* end of switch */
563 #if defined(CRAY2) && defined(UNICOS5)
565 * Just in case of the likely event that we changed the pty state.
568 #endif /* defined(CRAY2) && defined(UNICOS5) */
572 } /* end of clientstat */
574 #if defined(CRAY2) && defined(UNICOS5)
589 #endif /* defined(CRAY2) && defined(UNICOS5) */
595 * Some things should not be done until after the login process has started
596 * and all the pty modes are set to what they are supposed to be. This
597 * function is called when the pty state has been processed for the first time.
598 * It calls other functions that do things that were deferred in each module.
605 * local stuff that got deferred.
607 if (def_tspeed != -1) {
608 clientstat(TELOPT_TSPEED, def_tspeed, def_rspeed);
609 def_tspeed = def_rspeed = 0;
613 if (def_col || def_row) {
616 bzero((char *)&ws, sizeof(ws));
619 (void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
624 * The only other module that currently defers anything.
628 } /* end of defer_terminit */
633 * Returns true if the pty state has been processed yet.
640 } /* end of terminit */
641 #endif /* LINEMODE */