2 * Copyright (c) 1989 Regents of the University of California.
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 * From: @(#)termstat.c 5.10 (Berkeley) 3/22/91
38 char termstat_rcsid[] =
39 "$Id: termstat.c,v 1.2 2003-07-21 03:11:25 davidm Exp $";
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 * KLUDGE_LINEMODE : use kludge linemode
83 * NO_LINEMODE : client is ignorant of linemode
85 * linemode, uselinemode : linemode is true if linemode
86 * is currently on, uselinemode is the state that we wish
87 * to be in. If another function wishes to turn linemode
88 * on or off, it sets or clears uselinemode.
90 * editmode, useeditmode : like linemode/uselinemode, but
91 * these contain the edit mode states (edit and trapsig).
93 * The state variables correspond to some of the state information
96 * In real linemode, this corresponds to whether the pty
97 * expects external processing of incoming data.
98 * In kludge linemode, this more closely corresponds to the
99 * whether normal processing is on or not. (ICANON in
100 * system V, or COOKED mode in BSD.)
101 * If the -l option was specified (alwayslinemode), then
102 * an attempt is made to force external processing on at
105 * The following heuristics are applied to determine linemode
106 * handling within the server.
107 * 1) Early on in starting up the server, an attempt is made
108 * to negotiate the linemode option. If this succeeds
109 * then lmodetype is set to REAL_LINEMODE and all linemode
110 * processing occurs in the context of the linemode option.
111 * 2) If the attempt to negotiate the linemode option failed,
112 * then we try to use kludge linemode. We test for this
113 * capability by sending "do Timing Mark". If a positive
114 * response comes back, then we assume that the client
115 * understands kludge linemode (ech!) and the
116 * lmodetype flag is set to KLUDGE_LINEMODE.
117 * 3) Otherwise, linemode is not supported at all and
118 * lmodetype remains set to NO_LINEMODE (which happens
119 * to be 0 for convenience).
120 * 4) At any time a command arrives that implies a higher
121 * state of linemode support in the client, we move to that
124 * A short explanation of kludge linemode is in order here.
125 * 1) The heuristic to determine support for kludge linemode
126 * is to send a do timing mark. We assume that a client
127 * that supports timing marks also supports kludge linemode.
128 * A risky proposition at best.
129 * 2) Further negotiation of linemode is done by changing the
130 * the server's state regarding SGA. If server will SGA,
131 * then linemode is off, if server won't SGA, then linemode
138 int need_will_echo = 0;
140 #if defined(CRAY2) && defined(UNICOS5)
142 * Keep track of that ol' CR/NL mapping while we're in the
145 newmap = tty_isnewmap();
146 #endif /* defined(CRAY2) && defined(UNICOS5) */
149 * Check for state of BINARY options.
151 if (tty_isbinaryin()) {
152 if (his_want_state_is_wont(TELOPT_BINARY))
153 send_do(TELOPT_BINARY, 1);
155 if (his_want_state_is_will(TELOPT_BINARY))
156 send_dont(TELOPT_BINARY, 1);
159 if (tty_isbinaryout()) {
160 if (my_want_state_is_wont(TELOPT_BINARY))
161 send_will(TELOPT_BINARY, 1);
163 if (my_want_state_is_will(TELOPT_BINARY))
164 send_wont(TELOPT_BINARY, 1);
168 * Check for changes to flow control if client supports it.
170 if (his_state_is_will(TELOPT_LFLOW)) {
171 if (tty_flowmode() != flowmode) {
172 flowmode = tty_flowmode();
173 (void) sprintf(nfrontp, "%c%c%c%c%c%c", IAC, SB,
174 TELOPT_LFLOW, flowmode, IAC, SE);
180 * Check linemode on/off state
182 uselinemode = tty_linemode();
185 * If alwayslinemode is on, and pty is changing to turn it off, then
186 * force linemode back on.
188 if (alwayslinemode && linemode && !uselinemode) {
190 tty_setlinemode(uselinemode);
195 * If the terminal is not echoing, but editing is enabled,
196 * something like password input is going to happen, so
197 * if we the other side is not currently sending encrypted
198 * data, ask the other side to start encrypting.
200 if (his_state_is_will(TELOPT_ENCRYPT)) {
201 static int enc_passwd = 0;
202 if (uselinemode && !tty_isecho() && tty_isediting()
203 && (enc_passwd == 0) && !decrypt_input) {
204 encrypt_send_request_start();
206 } else if (enc_passwd) {
207 encrypt_send_request_end();
214 * Do echo mode handling as soon as we know what the
215 * linemode is going to be.
216 * If the pty has echo turned off, then tell the client that
217 * the server will echo. If echo is on, then the server
218 * will echo if in character mode, but in linemode the
219 * client should do local echoing. The state machine will
220 * not send anything if it is unnecessary, so don't worry
223 * If we need to send the WILL ECHO (because echo is off),
224 * then delay that until after we have changed the MODE.
225 * This way, when the user is turning off both editing
226 * and echo, the client will get editing turned off first.
227 * This keeps the client from going into encryption mode
228 * and then right back out if it is doing auto-encryption
229 * when passwords are being typed.
233 send_wont(TELOPT_ECHO, 1);
239 * If linemode is being turned off, send appropriate
240 * command and then we're all done.
242 if (!uselinemode && linemode) {
243 # ifdef KLUDGELINEMODE
244 if (lmodetype == REAL_LINEMODE) {
245 # endif /* KLUDGELINEMODE */
246 send_dont(TELOPT_LINEMODE, 1);
247 # ifdef KLUDGELINEMODE
248 } else if (lmodetype == KLUDGE_LINEMODE)
249 send_will(TELOPT_SGA, 1);
250 # endif /* KLUDGELINEMODE */
251 send_will(TELOPT_ECHO, 1);
252 linemode = uselinemode;
256 # ifdef KLUDGELINEMODE
258 * If using real linemode check edit modes for possible later use.
259 * If we are in kludge linemode, do the SGA negotiation.
261 if (lmodetype == REAL_LINEMODE) {
262 # endif /* KLUDGELINEMODE */
265 useeditmode |= MODE_EDIT;
267 useeditmode |= MODE_TRAPSIG;
269 useeditmode |= MODE_SOFT_TAB;
271 useeditmode |= MODE_LIT_ECHO;
272 # ifdef KLUDGELINEMODE
273 } else if (lmodetype == KLUDGE_LINEMODE) {
274 if (tty_isediting() && uselinemode)
275 send_wont(TELOPT_SGA, 1);
277 send_will(TELOPT_SGA, 1);
279 # endif /* KLUDGELINEMODE */
282 * Negotiate linemode on if pty state has changed to turn it on.
283 * Send appropriate command and send along edit mode, then all done.
285 if (uselinemode && !linemode) {
286 # ifdef KLUDGELINEMODE
287 if (lmodetype == KLUDGE_LINEMODE) {
288 send_wont(TELOPT_SGA, 1);
289 } else if (lmodetype == REAL_LINEMODE) {
290 # endif /* KLUDGELINEMODE */
291 send_do(TELOPT_LINEMODE, 1);
292 /* send along edit modes */
293 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
294 TELOPT_LINEMODE, LM_MODE, useeditmode,
297 editmode = useeditmode;
298 # ifdef KLUDGELINEMODE
300 # endif /* KLUDGELINEMODE */
301 linemode = uselinemode;
305 # ifdef KLUDGELINEMODE
307 * None of what follows is of any value if not using
310 if (lmodetype < REAL_LINEMODE)
312 # endif /* KLUDGELINEMODE */
314 if (linemode && his_state_is_will(TELOPT_LINEMODE)) {
316 * If edit mode changed, send edit mode.
318 if (useeditmode != editmode) {
320 * Send along appropriate edit mode mask.
322 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC, SB,
323 TELOPT_LINEMODE, LM_MODE, useeditmode,
326 editmode = useeditmode;
331 * Check for changes to special characters in use.
340 send_will(TELOPT_ECHO, 1);
342 * Some things should be deferred until after the pty state has
343 * been set by the local process. Do those things that have been
344 * deferred now. This only happens once.
346 if (_terminit == 0) {
355 } /* end of localstat */
356 #endif /* LINEMODE */
362 * Process linemode related requests from the client.
363 * Client can request a change to only one of linemode, editmode or slc's
364 * at a time, and if using kludge linemode, then only linemode may be
368 clientstat(code, parm1, parm2)
369 register int code, parm1, parm2;
372 * Get a copy of terminal characteristics.
377 * Process request from client. code tells what it is.
381 case TELOPT_LINEMODE:
383 * Don't do anything unless client is asking us to change
386 uselinemode = (parm1 == WILL);
387 if (uselinemode != linemode) {
388 # ifdef KLUDGELINEMODE
390 * If using kludge linemode, make sure that
391 * we can do what the client asks.
392 * We can not turn off linemode if alwayslinemode
393 * and the ICANON bit is set.
395 if (lmodetype == KLUDGE_LINEMODE) {
396 if (alwayslinemode && tty_isediting()) {
402 * Quit now if we can't do it.
404 if (uselinemode == linemode)
408 * If using real linemode and linemode is being
409 * turned on, send along the edit mode mask.
411 if (lmodetype == REAL_LINEMODE && uselinemode)
412 # else /* KLUDGELINEMODE */
414 # endif /* KLUDGELINEMODE */
418 useeditmode |= MODE_EDIT;
420 useeditmode |= MODE_TRAPSIG;
422 useeditmode |= MODE_SOFT_TAB;
424 useeditmode |= MODE_LIT_ECHO;
425 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
426 SB, TELOPT_LINEMODE, LM_MODE,
427 useeditmode, IAC, SE);
429 editmode = useeditmode;
433 tty_setlinemode(uselinemode);
435 linemode = uselinemode;
442 register int ack, changed;
445 * Client has sent along a mode mask. If it agrees with
446 * what we are currently doing, ignore it; if not, it could
447 * be viewed as a request to change. Note that the server
448 * will change to the modes in an ack if it is different from
449 * what we currently have, but we will not ack the ack.
451 useeditmode &= MODE_MASK;
452 ack = (useeditmode & MODE_ACK);
453 useeditmode &= ~MODE_ACK;
455 if (changed = (useeditmode ^ editmode)) {
457 * This check is for a timing problem. If the
458 * state of the tty has changed (due to the user
459 * application) we need to process that info
460 * before we write in the state contained in the
461 * ack!!! This gets out the new MODE request,
462 * and when the ack to that command comes back
463 * we'll set it and be in the right mode.
467 if (changed & MODE_EDIT)
468 tty_setedit(useeditmode & MODE_EDIT);
470 if (changed & MODE_TRAPSIG)
471 tty_setsig(useeditmode & MODE_TRAPSIG);
473 if (changed & MODE_SOFT_TAB)
474 tty_setsofttab(useeditmode & MODE_SOFT_TAB);
476 if (changed & MODE_LIT_ECHO)
477 tty_setlitecho(useeditmode & MODE_LIT_ECHO);
482 (void) sprintf(nfrontp, "%c%c%c%c%c%c%c", IAC,
483 SB, TELOPT_LINEMODE, LM_MODE,
484 useeditmode|MODE_ACK,
489 editmode = useeditmode;
494 } /* end of case LM_MODE */
495 #endif /* LINEMODE */
506 * Defer changing window size until after terminal is
511 #endif /* LINEMODE */
514 * Change window size as requested by client.
519 (void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
521 #endif /* TIOCSWINSZ */
531 * Defer changing the terminal speed.
535 #endif /* LINEMODE */
537 * Change terminal speed as requested by client.
538 * We set the receive speed first, so that if we can't
539 * store seperate receive and transmit speeds, the transmit
540 * speed will take precedence.
548 } /* end of case TELOPT_TSPEED */
553 } /* end of switch */
555 #if defined(CRAY2) && defined(UNICOS5)
557 * Just in case of the likely event that we changed the pty state.
560 #endif /* defined(CRAY2) && defined(UNICOS5) */
564 } /* end of clientstat */
566 #if defined(CRAY2) && defined(UNICOS5)
581 #endif /* defined(CRAY2) && defined(UNICOS5) */
587 * Some things should not be done until after the login process has started
588 * and all the pty modes are set to what they are supposed to be. This
589 * function is called when the pty state has been processed for the first time.
590 * It calls other functions that do things that were deferred in each module.
597 * local stuff that got deferred.
599 if (def_tspeed != -1) {
600 clientstat(TELOPT_TSPEED, def_tspeed, def_rspeed);
601 def_tspeed = def_rspeed = 0;
605 if (def_col || def_row) {
608 bzero((char *)&ws, sizeof(ws));
611 (void) ioctl(pty, TIOCSWINSZ, (char *)&ws);
616 * The only other module that currently defers anything.
620 } /* end of defer_terminit */
625 * Returns true if the pty state has been processed yet.
632 } /* end of terminit */
633 #endif /* LINEMODE */