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[netbsd-mini2440.git] / libexec / telnetd / state.c
blob19088a40508a86f81af08fa75845531640490ea1
1 /* $NetBSD: state.c,v 1.26 2005/06/21 22:29:53 lha Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)state.c 8.5 (Berkeley) 5/30/95";
36 #else
37 __RCSID("$NetBSD: state.c,v 1.26 2005/06/21 22:29:53 lha Exp $");
38 #endif
39 #endif /* not lint */
40
41 #include <ctype.h>
42 #include <stdarg.h>
43
44 #include "telnetd.h"
45
46 static int envvarok(char *);
47
48 unsigned const char doopt[] = { IAC, DO, '%', 'c', 0 };
49 unsigned const char dont[] = { IAC, DONT, '%', 'c', 0 };
50 unsigned const char will[] = { IAC, WILL, '%', 'c', 0 };
51 unsigned const char wont[] = { IAC, WONT, '%', 'c', 0 };
52 int not42 = 1;
53
54 /*
55 * Buffer for sub-options, and macros
56 * for suboptions buffer manipulations
57 */
58 unsigned char subbuffer[4096], *subpointer= subbuffer, *subend= subbuffer;
59
60 #define SB_CLEAR() subpointer = subbuffer
61 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
62 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
63 *subpointer++ = (c); \
64 }
65 #define SB_GET() ((*subpointer++)&0xff)
66 #define SB_EOF() (subpointer >= subend)
67 #define SB_LEN() (subend - subpointer)
68
69 #ifdef ENV_HACK
70 unsigned char *subsave;
71 #define SB_SAVE() subsave = subpointer;
72 #define SB_RESTORE() subpointer = subsave;
73 #endif
74
75
76 /*
77 * State for recv fsm
78 */
79 #define TS_DATA 0 /* base state */
80 #define TS_IAC 1 /* look for double IAC's */
81 #define TS_CR 2 /* CR-LF ->'s CR */
82 #define TS_SB 3 /* throw away begin's... */
83 #define TS_SE 4 /* ...end's (suboption negotiation) */
84 #define TS_WILL 5 /* will option negotiation */
85 #define TS_WONT 6 /* wont " */
86 #define TS_DO 7 /* do " */
87 #define TS_DONT 8 /* dont " */
88
89 void
90 telrcv(void)
91 {
92 int c;
93 static int state = TS_DATA;
94
95 while (ncc > 0) {
96 if ((&ptyobuf[BUFSIZ] - pfrontp) < 2)
97 break;
98 c = *netip++ & 0377, ncc--;
99 #ifdef ENCRYPTION
100 if (decrypt_input)
101 c = (*decrypt_input)(c);
102 #endif /* ENCRYPTION */
103 switch (state) {
104
105 case TS_CR:
106 state = TS_DATA;
107 /* Strip off \n or \0 after a \r */
108 if ((c == 0) || (c == '\n')) {
109 break;
110 }
111 /* FALL THROUGH */
112
113 case TS_DATA:
114 if (c == IAC) {
115 state = TS_IAC;
116 break;
117 }
118 /*
119 * We now map \r\n ==> \r for pragmatic reasons.
120 * Many client implementations send \r\n when
121 * the user hits the CarriageReturn key.
122 *
123 * We USED to map \r\n ==> \n, since \r\n says
124 * that we want to be in column 1 of the next
125 * printable line, and \n is the standard
126 * unix way of saying that (\r is only good
127 * if CRMOD is set, which it normally is).
128 */
129 if ((c == '\r') && his_state_is_wont(TELOPT_BINARY)) {
130 int nc = *netip;
131 #ifdef ENCRYPTION
132 if (decrypt_input)
133 nc = (*decrypt_input)(nc & 0xff);
134 #endif /* ENCRYPTION */
135 #ifdef LINEMODE
136 /*
137 * If we are operating in linemode,
138 * convert to local end-of-line.
139 */
140 if (linemode && (ncc > 0) && (('\n' == nc) ||
141 ((0 == nc) && tty_iscrnl())) ) {
142 netip++; ncc--;
143 c = '\n';
144 } else
145 #endif
146 {
147 #ifdef ENCRYPTION
148 if (decrypt_input)
149 (void)(*decrypt_input)(-1);
150 #endif /* ENCRYPTION */
151 state = TS_CR;
152 }
153 }
154 *pfrontp++ = c;
155 break;
156
157 case TS_IAC:
158 gotiac: switch (c) {
159
160 /*
161 * Send the process on the pty side an
162 * interrupt. Do this with a NULL or
163 * interrupt char; depending on the tty mode.
164 */
165 case IP:
166 DIAG(TD_OPTIONS,
167 printoption("td: recv IAC", c));
168 interrupt();
169 break;
170
171 case BREAK:
172 DIAG(TD_OPTIONS,
173 printoption("td: recv IAC", c));
174 sendbrk();
175 break;
176
177 /*
178 * Are You There?
179 */
180 case AYT:
181 DIAG(TD_OPTIONS,
182 printoption("td: recv IAC", c));
183 recv_ayt();
184 break;
185
186 /*
187 * Abort Output
188 */
189 case AO:
190 {
191 DIAG(TD_OPTIONS,
192 printoption("td: recv IAC", c));
193 ptyflush(); /* half-hearted */
194 init_termbuf();
195
196 if (slctab[SLC_AO].sptr &&
197 *slctab[SLC_AO].sptr != (cc_t)(_POSIX_VDISABLE)) {
198 *pfrontp++ =
199 (unsigned char)*slctab[SLC_AO].sptr;
200 }
201
202 netclear(); /* clear buffer back */
203 output_data("%c%c", IAC, DM);
204 neturg = nfrontp - 1; /* off by one XXX */
205 DIAG(TD_OPTIONS,
206 printoption("td: send IAC", DM));
207 break;
208 }
209
210 /*
211 * Erase Character and
212 * Erase Line
213 */
214 case EC:
215 case EL:
216 {
217 cc_t ch;
218
219 DIAG(TD_OPTIONS,
220 printoption("td: recv IAC", c));
221 ptyflush(); /* half-hearted */
222 init_termbuf();
223 if (c == EC)
224 ch = *slctab[SLC_EC].sptr;
225 else
226 ch = *slctab[SLC_EL].sptr;
227 if (ch != (cc_t)(_POSIX_VDISABLE))
228 *pfrontp++ = (unsigned char)ch;
229 break;
230 }
231
232 /*
233 * Check for urgent data...
234 */
235 case DM:
236 DIAG(TD_OPTIONS,
237 printoption("td: recv IAC", c));
238 SYNCHing = stilloob(net);
239 settimer(gotDM);
240 break;
241
242
243 /*
244 * Begin option subnegotiation...
245 */
246 case SB:
247 state = TS_SB;
248 SB_CLEAR();
249 continue;
250
251 case WILL:
252 state = TS_WILL;
253 continue;
254
255 case WONT:
256 state = TS_WONT;
257 continue;
258
259 case DO:
260 state = TS_DO;
261 continue;
262
263 case DONT:
264 state = TS_DONT;
265 continue;
266 case EOR:
267 if (his_state_is_will(TELOPT_EOR))
268 doeof();
269 break;
270
271 /*
272 * Handle RFC 10xx Telnet linemode option additions
273 * to command stream (EOF, SUSP, ABORT).
274 */
275 case xEOF:
276 doeof();
277 break;
278
279 case SUSP:
280 sendsusp();
281 break;
282
283 case ABORT:
284 sendbrk();
285 break;
286
287 case IAC:
288 *pfrontp++ = c;
289 break;
290 }
291 state = TS_DATA;
292 break;
293
294 case TS_SB:
295 if (c == IAC) {
296 state = TS_SE;
297 } else {
298 SB_ACCUM(c);
299 }
300 break;
301
302 case TS_SE:
303 if (c != SE) {
304 if (c != IAC) {
305 /*
306 * bad form of suboption negotiation.
307 * handle it in such a way as to avoid
308 * damage to local state. Parse
309 * suboption buffer found so far,
310 * then treat remaining stream as
311 * another command sequence.
312 */
313
314 /* for DIAGNOSTICS */
315 SB_ACCUM(IAC);
316 SB_ACCUM(c);
317 subpointer -= 2;
318
319 SB_TERM();
320 suboption();
321 state = TS_IAC;
322 goto gotiac;
323 }
324 SB_ACCUM(c);
325 state = TS_SB;
326 } else {
327 /* for DIAGNOSTICS */
328 SB_ACCUM(IAC);
329 SB_ACCUM(SE);
330 subpointer -= 2;
331
332 SB_TERM();
333 suboption(); /* handle sub-option */
334 state = TS_DATA;
335 }
336 break;
337
338 case TS_WILL:
339 willoption(c);
340 state = TS_DATA;
341 continue;
342
343 case TS_WONT:
344 wontoption(c);
345 state = TS_DATA;
346 continue;
347
348 case TS_DO:
349 dooption(c);
350 state = TS_DATA;
351 continue;
352
353 case TS_DONT:
354 dontoption(c);
355 state = TS_DATA;
356 continue;
357
358 default:
359 syslog(LOG_ERR, "panic state=%d", state);
360 printf("telnetd: panic state=%d\n", state);
361 exit(1);
362 }
363 }
364 } /* end of telrcv */
365
366 /*
367 * The will/wont/do/dont state machines are based on Dave Borman's
368 * Telnet option processing state machine.
369 *
370 * These correspond to the following states:
371 * my_state = the last negotiated state
372 * want_state = what I want the state to go to
373 * want_resp = how many requests I have sent
374 * All state defaults are negative, and resp defaults to 0.
375 *
376 * When initiating a request to change state to new_state:
377 *
378 * if ((want_resp == 0 && new_state == my_state) || want_state == new_state) {
379 * do nothing;
380 * } else {
381 * want_state = new_state;
382 * send new_state;
383 * want_resp++;
384 * }
385 *
386 * When receiving new_state:
387 *
388 * if (want_resp) {
389 * want_resp--;
390 * if (want_resp && (new_state == my_state))
391 * want_resp--;
392 * }
393 * if ((want_resp == 0) && (new_state != want_state)) {
394 * if (ok_to_switch_to new_state)
395 * want_state = new_state;
396 * else
397 * want_resp++;
398 * send want_state;
399 * }
400 * my_state = new_state;
401 *
402 * Note that new_state is implied in these functions by the function itself.
403 * will and do imply positive new_state, wont and dont imply negative.
404 *
405 * Finally, there is one catch. If we send a negative response to a
406 * positive request, my_state will be the positive while want_state will
407 * remain negative. my_state will revert to negative when the negative
408 * acknowlegment arrives from the peer. Thus, my_state generally tells
409 * us not only the last negotiated state, but also tells us what the peer
410 * wants to be doing as well. It is important to understand this difference
411 * as we may wish to be processing data streams based on our desired state
412 * (want_state) or based on what the peer thinks the state is (my_state).
413 *
414 * This all works fine because if the peer sends a positive request, the data
415 * that we receive prior to negative acknowlegment will probably be affected
416 * by the positive state, and we can process it as such (if we can; if we
417 * can't then it really doesn't matter). If it is that important, then the
418 * peer probably should be buffering until this option state negotiation
419 * is complete.
420 *
421 */
422 void
423 send_do(int option, int init)
424 {
425 if (init) {
426 if ((do_dont_resp[option] == 0 && his_state_is_will(option)) ||
427 his_want_state_is_will(option))
428 return;
429 /*
430 * Special case for TELOPT_TM: We send a DO, but pretend
431 * that we sent a DONT, so that we can send more DOs if
432 * we want to.
433 */
434 if (option == TELOPT_TM)
435 set_his_want_state_wont(option);
436 else
437 set_his_want_state_will(option);
438 do_dont_resp[option]++;
439 }
440 (void) output_data((const char *)doopt, option);
441
442 DIAG(TD_OPTIONS, printoption("td: send do", option));
443 }
444
445 #ifdef LINEMODE
446 extern void doclientstat(void);
447 #endif
448 #if 0
449 #ifdef AUTHENTICATION
450 extern void auth_request(void); /* libtelnet */
451 #endif
452 #ifdef ENCRYPTION
453 extern void encrypt_send_support(void);
454 #endif /* ENCRYPTION */
455 #endif
456
457 void
458 willoption(int option)
459 {
460 int changeok = 0;
461 void (*func)(void) = 0;
462
463 /*
464 * process input from peer.
465 */
466
467 DIAG(TD_OPTIONS, printoption("td: recv will", option));
468
469 if (do_dont_resp[option]) {
470 do_dont_resp[option]--;
471 if (do_dont_resp[option] && his_state_is_will(option))
472 do_dont_resp[option]--;
473 }
474 if (do_dont_resp[option] == 0) {
475 if (his_want_state_is_wont(option)) {
476 switch (option) {
477
478 case TELOPT_BINARY:
479 init_termbuf();
480 tty_binaryin(1);
481 set_termbuf();
482 changeok++;
483 break;
484
485 case TELOPT_ECHO:
486 /*
487 * See comments below for more info.
488 */
489 not42 = 0; /* looks like a 4.2 system */
490 break;
491
492 case TELOPT_TM:
493 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
494 /*
495 * This telnetd implementation does not really
496 * support timing marks, it just uses them to
497 * support the kludge linemode stuff. If we
498 * receive a will or wont TM in response to our
499 * do TM request that may have been sent to
500 * determine kludge linemode support, process
501 * it, otherwise TM should get a negative
502 * response back.
503 */
504 /*
505 * Handle the linemode kludge stuff.
506 * If we are not currently supporting any
507 * linemode at all, then we assume that this
508 * is the client telling us to use kludge
509 * linemode in response to our query. Set the
510 * linemode type that is to be supported, note
511 * that the client wishes to use linemode, and
512 * eat the will TM as though it never arrived.
513 */
514 if (lmodetype < KLUDGE_LINEMODE) {
515 lmodetype = KLUDGE_LINEMODE;
516 clientstat(TELOPT_LINEMODE, WILL, 0);
517 send_wont(TELOPT_SGA, 1);
518 } else if (lmodetype == NO_AUTOKLUDGE) {
519 lmodetype = KLUDGE_OK;
520 }
521 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
522 /*
523 * We never respond to a WILL TM, and
524 * we leave the state WONT.
525 */
526 return;
527
528 case TELOPT_LFLOW:
529 /*
530 * If we are going to support flow control
531 * option, then don't worry peer that we can't
532 * change the flow control characters.
533 */
534 slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS;
535 slctab[SLC_XON].defset.flag |= SLC_DEFAULT;
536 slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS;
537 slctab[SLC_XOFF].defset.flag |= SLC_DEFAULT;
538 case TELOPT_TTYPE:
539 case TELOPT_SGA:
540 case TELOPT_NAWS:
541 case TELOPT_TSPEED:
542 case TELOPT_XDISPLOC:
543 case TELOPT_NEW_ENVIRON:
544 case TELOPT_OLD_ENVIRON:
545 changeok++;
546 break;
547
548 #ifdef LINEMODE
549 case TELOPT_LINEMODE:
550 # ifdef KLUDGELINEMODE
551 /*
552 * Note client's desire to use linemode.
553 */
554 lmodetype = REAL_LINEMODE;
555 # endif /* KLUDGELINEMODE */
556 func = doclientstat;
557 changeok++;
558 break;
559 #endif /* LINEMODE */
560
561 #ifdef AUTHENTICATION
562 case TELOPT_AUTHENTICATION:
563 func = auth_request;
564 changeok++;
565 break;
566 #endif
567
568 #ifdef ENCRYPTION
569 case TELOPT_ENCRYPT:
570 func = encrypt_send_support;
571 changeok++;
572 break;
573 #endif /* ENCRYPTION */
574
575 default:
576 break;
577 }
578 if (changeok) {
579 set_his_want_state_will(option);
580 send_do(option, 0);
581 } else {
582 do_dont_resp[option]++;
583 send_dont(option, 0);
584 }
585 } else {
586 /*
587 * Option processing that should happen when
588 * we receive conformation of a change in
589 * state that we had requested.
590 */
591 switch (option) {
592 case TELOPT_ECHO:
593 not42 = 0; /* looks like a 4.2 system */
594 /*
595 * Egads, he responded "WILL ECHO". Turn
596 * it off right now!
597 */
598 send_dont(option, 1);
599 /*
600 * "WILL ECHO". Kludge upon kludge!
601 * A 4.2 client is now echoing user input at
602 * the tty. This is probably undesireable and
603 * it should be stopped. The client will
604 * respond WONT TM to the DO TM that we send to
605 * check for kludge linemode. When the WONT TM
606 * arrives, linemode will be turned off and a
607 * change propogated to the pty. This change
608 * will cause us to process the new pty state
609 * in localstat(), which will notice that
610 * linemode is off and send a WILL ECHO
611 * so that we are properly in character mode and
612 * all is well.
613 */
614 break;
615 #ifdef LINEMODE
616 case TELOPT_LINEMODE:
617 # ifdef KLUDGELINEMODE
618 /*
619 * Note client's desire to use linemode.
620 */
621 lmodetype = REAL_LINEMODE;
622 # endif /* KLUDGELINEMODE */
623 func = doclientstat;
624 break;
625 #endif /* LINEMODE */
626
627 #ifdef AUTHENTICATION
628 case TELOPT_AUTHENTICATION:
629 func = auth_request;
630 break;
631 #endif
632
633 #ifdef ENCRYPTION
634 case TELOPT_ENCRYPT:
635 func = encrypt_send_support;
636 break;
637 #endif /* ENCRYPTION */
638
639 case TELOPT_LFLOW:
640 func = flowstat;
641 break;
642 }
643 }
644 }
645 set_his_state_will(option);
646 if (func)
647 (*func)();
648 } /* end of willoption */
649
650 void
651 send_dont(int option, int init)
652 {
653 if (init) {
654 if ((do_dont_resp[option] == 0 && his_state_is_wont(option)) ||
655 his_want_state_is_wont(option))
656 return;
657 set_his_want_state_wont(option);
658 do_dont_resp[option]++;
659 }
660 (void) output_data((const char *)dont, option);
661
662 DIAG(TD_OPTIONS, printoption("td: send dont", option));
663 }
664
665 void
666 wontoption(int option)
667 {
668 /*
669 * Process client input.
670 */
671
672 DIAG(TD_OPTIONS, printoption("td: recv wont", option));
673
674 if (do_dont_resp[option]) {
675 do_dont_resp[option]--;
676 if (do_dont_resp[option] && his_state_is_wont(option))
677 do_dont_resp[option]--;
678 }
679 if (do_dont_resp[option] == 0) {
680 if (his_want_state_is_will(option)) {
681 /* it is always ok to change to negative state */
682 switch (option) {
683 case TELOPT_ECHO:
684 not42 = 1; /* doesn't seem to be a 4.2 system */
685 break;
686
687 case TELOPT_BINARY:
688 init_termbuf();
689 tty_binaryin(0);
690 set_termbuf();
691 break;
692
693 #ifdef LINEMODE
694 case TELOPT_LINEMODE:
695 # ifdef KLUDGELINEMODE
696 /*
697 * If real linemode is supported, then client is
698 * asking to turn linemode off.
699 */
700 if (lmodetype != REAL_LINEMODE)
701 break;
702 /* XXX double-check this --thorpej */
703 lmodetype = KLUDGE_LINEMODE;
704 # endif /* KLUDGELINEMODE */
705 clientstat(TELOPT_LINEMODE, WONT, 0);
706 break;
707 #endif /* LINEMODE */
708
709 case TELOPT_TM:
710 /*
711 * If we get a WONT TM, and had sent a DO TM,
712 * don't respond with a DONT TM, just leave it
713 * as is. Short circut the state machine to
714 * achieve this.
715 */
716 set_his_want_state_wont(TELOPT_TM);
717 return;
718
719 case TELOPT_LFLOW:
720 /*
721 * If we are not going to support flow control
722 * option, then let peer know that we can't
723 * change the flow control characters.
724 */
725 slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS;
726 slctab[SLC_XON].defset.flag |= SLC_CANTCHANGE;
727 slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS;
728 slctab[SLC_XOFF].defset.flag |= SLC_CANTCHANGE;
729 break;
730
731 #ifdef AUTHENTICATION
732 case TELOPT_AUTHENTICATION:
733 auth_finished(0, AUTH_REJECT);
734 break;
735 #endif
736
737 /*
738 * For options that we might spin waiting for
739 * sub-negotiation, if the client turns off the
740 * option rather than responding to the request,
741 * we have to treat it here as if we got a response
742 * to the sub-negotiation, (by updating the timers)
743 * so that we'll break out of the loop.
744 */
745 case TELOPT_TTYPE:
746 settimer(ttypesubopt);
747 break;
748
749 case TELOPT_TSPEED:
750 settimer(tspeedsubopt);
751 break;
752
753 case TELOPT_XDISPLOC:
754 settimer(xdisplocsubopt);
755 break;
756
757 case TELOPT_OLD_ENVIRON:
758 settimer(oenvironsubopt);
759 break;
760
761 case TELOPT_NEW_ENVIRON:
762 settimer(environsubopt);
763 break;
764
765 default:
766 break;
767 }
768 set_his_want_state_wont(option);
769 if (his_state_is_will(option))
770 send_dont(option, 0);
771 } else {
772 switch (option) {
773 case TELOPT_TM:
774 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
775 if (lmodetype < NO_AUTOKLUDGE) {
776 lmodetype = NO_LINEMODE;
777 clientstat(TELOPT_LINEMODE, WONT, 0);
778 send_will(TELOPT_SGA, 1);
779 send_will(TELOPT_ECHO, 1);
780 }
781 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
782 break;
783
784 #ifdef AUTHENTICATION
785 case TELOPT_AUTHENTICATION:
786 auth_finished(0, AUTH_REJECT);
787 break;
788 #endif
789 default:
790 break;
791 }
792 }
793 }
794 set_his_state_wont(option);
795
796 } /* end of wontoption */
797
798 void
799 send_will(int option, int init)
800 {
801 if (init) {
802 if ((will_wont_resp[option] == 0 && my_state_is_will(option))||
803 my_want_state_is_will(option))
804 return;
805 set_my_want_state_will(option);
806 will_wont_resp[option]++;
807 }
808 (void) output_data((const char *)will, option);
809
810 DIAG(TD_OPTIONS, printoption("td: send will", option));
811 }
812
813 #if !defined(LINEMODE) || !defined(KLUDGELINEMODE)
814 /*
815 * When we get a DONT SGA, we will try once to turn it
816 * back on. If the other side responds DONT SGA, we
817 * leave it at that. This is so that when we talk to
818 * clients that understand KLUDGELINEMODE but not LINEMODE,
819 * we'll keep them in char-at-a-time mode.
820 */
821 int turn_on_sga = 0;
822 #endif
823
824 void
825 dooption(int option)
826 {
827 int changeok = 0;
828
829 /*
830 * Process client input.
831 */
832
833 DIAG(TD_OPTIONS, printoption("td: recv do", option));
834
835 if (will_wont_resp[option]) {
836 will_wont_resp[option]--;
837 if (will_wont_resp[option] && my_state_is_will(option))
838 will_wont_resp[option]--;
839 }
840 if ((will_wont_resp[option] == 0) && (my_want_state_is_wont(option))) {
841 switch (option) {
842 case TELOPT_ECHO:
843 #ifdef LINEMODE
844 # ifdef KLUDGELINEMODE
845 if (lmodetype == NO_LINEMODE)
846 # else
847 if (his_state_is_wont(TELOPT_LINEMODE))
848 # endif
849 #endif
850 {
851 init_termbuf();
852 tty_setecho(1);
853 set_termbuf();
854 }
855 changeok++;
856 break;
857
858 case TELOPT_BINARY:
859 init_termbuf();
860 tty_binaryout(1);
861 set_termbuf();
862 changeok++;
863 break;
864
865 case TELOPT_SGA:
866 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
867 /*
868 * If kludge linemode is in use, then we must
869 * process an incoming do SGA for linemode
870 * purposes.
871 */
872 if (lmodetype == KLUDGE_LINEMODE) {
873 /*
874 * Receipt of "do SGA" in kludge
875 * linemode is the peer asking us to
876 * turn off linemode. Make note of
877 * the request.
878 */
879 clientstat(TELOPT_LINEMODE, WONT, 0);
880 /*
881 * If linemode did not get turned off
882 * then don't tell peer that we did.
883 * Breaking here forces a wont SGA to
884 * be returned.
885 */
886 if (linemode)
887 break;
888 }
889 #else
890 turn_on_sga = 0;
891 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
892 changeok++;
893 break;
894
895 case TELOPT_STATUS:
896 changeok++;
897 break;
898
899 case TELOPT_TM:
900 /*
901 * Special case for TM. We send a WILL, but
902 * pretend we sent a WONT.
903 */
904 send_will(option, 0);
905 set_my_want_state_wont(option);
906 set_my_state_wont(option);
907 return;
908
909 case TELOPT_LOGOUT:
910 /*
911 * When we get a LOGOUT option, respond
912 * with a WILL LOGOUT, make sure that
913 * it gets written out to the network,
914 * and then just go away...
915 */
916 set_my_want_state_will(TELOPT_LOGOUT);
917 send_will(TELOPT_LOGOUT, 0);
918 set_my_state_will(TELOPT_LOGOUT);
919 (void)netflush();
920 cleanup(0);
921 /* NOT REACHED */
922 break;
923
924 #ifdef ENCRYPTION
925 case TELOPT_ENCRYPT:
926 changeok++;
927 break;
928 #endif /* ENCRYPTION */
929
930 case TELOPT_LINEMODE:
931 case TELOPT_TTYPE:
932 case TELOPT_NAWS:
933 case TELOPT_TSPEED:
934 case TELOPT_LFLOW:
935 case TELOPT_XDISPLOC:
936 case TELOPT_OLD_ENVIRON:
937 default:
938 break;
939 }
940 if (changeok) {
941 set_my_want_state_will(option);
942 send_will(option, 0);
943 } else {
944 will_wont_resp[option]++;
945 send_wont(option, 0);
946 }
947 }
948 set_my_state_will(option);
949
950 } /* end of dooption */
951
952 void
953 send_wont(int option, int init)
954 {
955 if (init) {
956 if ((will_wont_resp[option] == 0 && my_state_is_wont(option)) ||
957 my_want_state_is_wont(option))
958 return;
959 set_my_want_state_wont(option);
960 will_wont_resp[option]++;
961 }
962 (void) output_data((const char *)wont, option);
963
964 DIAG(TD_OPTIONS, printoption("td: send wont", option));
965 }
966
967 void
968 dontoption(int option)
969 {
970 /*
971 * Process client input.
972 */
973
974
975 DIAG(TD_OPTIONS, printoption("td: recv dont", option));
976
977 if (will_wont_resp[option]) {
978 will_wont_resp[option]--;
979 if (will_wont_resp[option] && my_state_is_wont(option))
980 will_wont_resp[option]--;
981 }
982 if ((will_wont_resp[option] == 0) && (my_want_state_is_will(option))) {
983 switch (option) {
984 case TELOPT_BINARY:
985 init_termbuf();
986 tty_binaryout(0);
987 set_termbuf();
988 break;
989
990 case TELOPT_ECHO: /* we should stop echoing */
991 #ifdef LINEMODE
992 # ifdef KLUDGELINEMODE
993 if ((lmodetype != REAL_LINEMODE) &&
994 (lmodetype != KLUDGE_LINEMODE))
995 # else
996 if (his_state_is_wont(TELOPT_LINEMODE))
997 # endif
998 #endif
999 {
1000 init_termbuf();
1001 tty_setecho(0);
1002 set_termbuf();
1003 }
1004 break;
1005
1006 case TELOPT_SGA:
1007 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
1008 /*
1009 * If kludge linemode is in use, then we
1010 * must process an incoming do SGA for
1011 * linemode purposes.
1012 */
1013 if ((lmodetype == KLUDGE_LINEMODE) ||
1014 (lmodetype == KLUDGE_OK)) {
1015 /*
1016 * The client is asking us to turn
1017 * linemode on.
1018 */
1019 lmodetype = KLUDGE_LINEMODE;
1020 clientstat(TELOPT_LINEMODE, WILL, 0);
1021 /*
1022 * If we did not turn line mode on,
1023 * then what do we say? Will SGA?
1024 * This violates design of telnet.
1025 * Gross. Very Gross.
1026 */
1027 }
1028 break;
1029 #else
1030 set_my_want_state_wont(option);
1031 if (my_state_is_will(option))
1032 send_wont(option, 0);
1033 set_my_state_wont(option);
1034 if (turn_on_sga ^= 1)
1035 send_will(option, 1);
1036 return;
1037 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
1038
1039 default:
1040 break;
1041 }
1042
1043 set_my_want_state_wont(option);
1044 if (my_state_is_will(option))
1045 send_wont(option, 0);
1046 }
1047 set_my_state_wont(option);
1048
1049 } /* end of dontoption */
1050
1051 #ifdef ENV_HACK
1052 int env_ovar = -1;
1053 int env_ovalue = -1;
1054 #else /* ENV_HACK */
1055 # define env_ovar OLD_ENV_VAR
1056 # define env_ovalue OLD_ENV_VALUE
1057 #endif /* ENV_HACK */
1058
1059 /* envvarok(char*) */
1060 /* check that variable is safe to pass to login or shell */
1061 static int
1062 envvarok(char *varp)
1063 {
1064
1065 if (strcmp(varp, "TERMCAP") && /* to prevent a security hole */
1066 strcmp(varp, "TERMINFO") && /* with tgetent */
1067 strcmp(varp, "TERMPATH") &&
1068 strcmp(varp, "HOME") && /* to prevent the tegetent bug */
1069 strncmp(varp, "LD_", strlen("LD_")) && /* most systems */
1070 strncmp(varp, "_RLD_", strlen("_RLD_")) && /* IRIX */
1071 strcmp(varp, "LIBPATH") && /* AIX */
1072 strcmp(varp, "ENV") &&
1073 strcmp(varp, "BASH_ENV") &&
1074 strcmp(varp, "IFS") &&
1075 strncmp(varp, "KRB5", strlen("KRB5")) && /* Krb5 */
1076 /*
1077 * The above case is a catch-all for now. Here are some of
1078 * the specific ones we must avoid passing, at least until
1079 * we can prove it can be done safely. Keep this list
1080 * around un case someone wants to remove the catch-all.
1081 */
1082 strcmp(varp, "KRB5_CONFIG") && /* Krb5 */
1083 strcmp(varp, "KRB5CCNAME") && /* Krb5 */
1084 strcmp(varp, "KRB5_KTNAME") && /* Krb5 */
1085 strcmp(varp, "KRBTKFILE") && /* Krb4 */
1086 strcmp(varp, "KRB_CONF") && /* CNS 4 */
1087 strcmp(varp, "KRB_REALMS") && /* CNS 4 */
1088 strcmp(varp, "RESOLV_HOST_CONF")) /* Linux */
1089 return (1);
1090 else {
1091 syslog(LOG_INFO, "Rejected the attempt to modify the "
1092 "environment variable \"%s\"", varp);
1093 return (0);
1094 }
1095 }
1096
1097 /*
1098 * suboption()
1099 *
1100 * Look at the sub-option buffer, and try to be helpful to the other
1101 * side.
1102 *
1103 * Currently we recognize:
1104 *
1105 * Terminal type is
1106 * Linemode
1107 * Window size
1108 * Terminal speed
1109 */
1110 void
1111 suboption(void)
1112 {
1113 int subchar;
1114
1115 DIAG(TD_OPTIONS, {netflush(); printsub('<', subpointer, SB_LEN()+2);});
1116
1117 subchar = SB_GET();
1118 switch (subchar) {
1119 case TELOPT_TSPEED: {
1120 int xspeed, rspeed;
1121
1122 if (his_state_is_wont(TELOPT_TSPEED)) /* Ignore if option disabled */
1123 break;
1124
1125 settimer(tspeedsubopt);
1126
1127 if (SB_EOF() || SB_GET() != TELQUAL_IS)
1128 return;
1129
1130 xspeed = atoi((char *)subpointer);
1131
1132 while (SB_GET() != ',' && !SB_EOF());
1133 if (SB_EOF())
1134 return;
1135
1136 rspeed = atoi((char *)subpointer);
1137 clientstat(TELOPT_TSPEED, xspeed, rspeed);
1138
1139 break;
1140
1141 } /* end of case TELOPT_TSPEED */
1142
1143 case TELOPT_TTYPE: { /* Yaaaay! */
1144 char *p;
1145
1146 if (his_state_is_wont(TELOPT_TTYPE)) /* Ignore if option disabled */
1147 break;
1148 settimer(ttypesubopt);
1149
1150 if (SB_EOF() || SB_GET() != TELQUAL_IS) {
1151 return; /* ??? XXX but, this is the most robust */
1152 }
1153
1154 p = terminaltype;
1155
1156 while ((p < (terminaltype + sizeof terminaltype-1)) &&
1157 !SB_EOF()) {
1158 int c;
1159
1160 c = SB_GET();
1161 if (isupper(c)) {
1162 c = tolower(c);
1163 }
1164 *p++ = c; /* accumulate name */
1165 }
1166 *p = 0;
1167 break;
1168 } /* end of case TELOPT_TTYPE */
1169
1170 case TELOPT_NAWS: {
1171 int xwinsize, ywinsize;
1172
1173 if (his_state_is_wont(TELOPT_NAWS)) /* Ignore if option disabled */
1174 break;
1175
1176 if (SB_EOF())
1177 return;
1178 xwinsize = SB_GET() << 8;
1179 if (SB_EOF())
1180 return;
1181 xwinsize |= SB_GET();
1182 if (SB_EOF())
1183 return;
1184 ywinsize = SB_GET() << 8;
1185 if (SB_EOF())
1186 return;
1187 ywinsize |= SB_GET();
1188 clientstat(TELOPT_NAWS, xwinsize, ywinsize);
1189
1190 break;
1191
1192 } /* end of case TELOPT_NAWS */
1193
1194 #ifdef LINEMODE
1195 case TELOPT_LINEMODE: {
1196 int request;
1197
1198 if (his_state_is_wont(TELOPT_LINEMODE)) /* Ignore if option disabled */
1199 break;
1200 /*
1201 * Process linemode suboptions.
1202 */
1203 if (SB_EOF())
1204 break; /* garbage was sent */
1205 request = SB_GET(); /* get will/wont */
1206
1207 if (SB_EOF())
1208 break; /* another garbage check */
1209
1210 if (request == LM_SLC) { /* SLC is not preceded by WILL or WONT */
1211 /*
1212 * Process suboption buffer of slc's
1213 */
1214 start_slc(1);
1215 do_opt_slc(subpointer, subend - subpointer);
1216 (void) end_slc(0);
1217 break;
1218 } else if (request == LM_MODE) {
1219 if (SB_EOF())
1220 return;
1221 useeditmode = SB_GET(); /* get mode flag */
1222 clientstat(LM_MODE, 0, 0);
1223 break;
1224 }
1225
1226 if (SB_EOF())
1227 break;
1228 switch (SB_GET()) { /* what suboption? */
1229 case LM_FORWARDMASK:
1230 /*
1231 * According to spec, only server can send request for
1232 * forwardmask, and client can only return a positive response.
1233 * So don't worry about it.
1234 */
1235
1236 default:
1237 break;
1238 }
1239 break;
1240 } /* end of case TELOPT_LINEMODE */
1241 #endif
1242 case TELOPT_STATUS: {
1243 int mode;
1244
1245 if (SB_EOF())
1246 break;
1247 mode = SB_GET();
1248 switch (mode) {
1249 case TELQUAL_SEND:
1250 if (my_state_is_will(TELOPT_STATUS))
1251 send_status();
1252 break;
1253
1254 case TELQUAL_IS:
1255 break;
1256
1257 default:
1258 break;
1259 }
1260 break;
1261 } /* end of case TELOPT_STATUS */
1262
1263 case TELOPT_XDISPLOC: {
1264 if (SB_EOF() || SB_GET() != TELQUAL_IS)
1265 return;
1266 settimer(xdisplocsubopt);
1267 subpointer[SB_LEN()] = '\0';
1268 (void)setenv("DISPLAY", (char *)subpointer, 1);
1269 break;
1270 } /* end of case TELOPT_XDISPLOC */
1271
1272 case TELOPT_NEW_ENVIRON:
1273 case TELOPT_OLD_ENVIRON: {
1274 int c;
1275 char *cp, *varp, *valp;
1276
1277 if (SB_EOF())
1278 return;
1279 c = SB_GET();
1280 if (c == TELQUAL_IS) {
1281 if (subchar == TELOPT_OLD_ENVIRON)
1282 settimer(oenvironsubopt);
1283 else
1284 settimer(environsubopt);
1285 } else if (c != TELQUAL_INFO) {
1286 return;
1287 }
1288
1289 if (subchar == TELOPT_NEW_ENVIRON) {
1290 while (!SB_EOF()) {
1291 c = SB_GET();
1292 if ((c == NEW_ENV_VAR) || (c == ENV_USERVAR))
1293 break;
1294 }
1295 } else
1296 {
1297 #ifdef ENV_HACK
1298 /*
1299 * We only want to do this if we haven't already decided
1300 * whether or not the other side has its VALUE and VAR
1301 * reversed.
1302 */
1303 if (env_ovar < 0) {
1304 int last = -1; /* invalid value */
1305 int empty = 0;
1306 int got_var = 0, got_value = 0, got_uservar = 0;
1307
1308 /*
1309 * The other side might have its VALUE and VAR values
1310 * reversed. To be interoperable, we need to determine
1311 * which way it is. If the first recognized character
1312 * is a VAR or VALUE, then that will tell us what
1313 * type of client it is. If the fist recognized
1314 * character is a USERVAR, then we continue scanning
1315 * the suboption looking for two consecutive
1316 * VAR or VALUE fields. We should not get two
1317 * consecutive VALUE fields, so finding two
1318 * consecutive VALUE or VAR fields will tell us
1319 * what the client is.
1320 */
1321 SB_SAVE();
1322 while (!SB_EOF()) {
1323 c = SB_GET();
1324 switch(c) {
1325 case OLD_ENV_VAR:
1326 if (last < 0 || last == OLD_ENV_VAR
1327 || (empty && (last == OLD_ENV_VALUE)))
1328 goto env_ovar_ok;
1329 got_var++;
1330 last = OLD_ENV_VAR;
1331 break;
1332 case OLD_ENV_VALUE:
1333 if (last < 0 || last == OLD_ENV_VALUE
1334 || (empty && (last == OLD_ENV_VAR)))
1335 goto env_ovar_wrong;
1336 got_value++;
1337 last = OLD_ENV_VALUE;
1338 break;
1339 case ENV_USERVAR:
1340 /* count strings of USERVAR as one */
1341 if (last != ENV_USERVAR)
1342 got_uservar++;
1343 if (empty) {
1344 if (last == OLD_ENV_VALUE)
1345 goto env_ovar_ok;
1346 if (last == OLD_ENV_VAR)
1347 goto env_ovar_wrong;
1348 }
1349 last = ENV_USERVAR;
1350 break;
1351 case ENV_ESC:
1352 if (!SB_EOF())
1353 c = SB_GET();
1354 /* FALL THROUGH */
1355 default:
1356 empty = 0;
1357 continue;
1358 }
1359 empty = 1;
1360 }
1361 if (empty) {
1362 if (last == OLD_ENV_VALUE)
1363 goto env_ovar_ok;
1364 if (last == OLD_ENV_VAR)
1365 goto env_ovar_wrong;
1366 }
1367 /*
1368 * Ok, the first thing was a USERVAR, and there
1369 * are not two consecutive VAR or VALUE commands,
1370 * and none of the VAR or VALUE commands are empty.
1371 * If the client has sent us a well-formed option,
1372 * then the number of VALUEs received should always
1373 * be less than or equal to the number of VARs and
1374 * USERVARs received.
1375 *
1376 * If we got exactly as many VALUEs as VARs and
1377 * USERVARs, the client has the same definitions.
1378 *
1379 * If we got exactly as many VARs as VALUEs and
1380 * USERVARS, the client has reversed definitions.
1381 */
1382 if (got_uservar + got_var == got_value) {
1383 env_ovar_ok:
1384 env_ovar = OLD_ENV_VAR;
1385 env_ovalue = OLD_ENV_VALUE;
1386 } else if (got_uservar + got_value == got_var) {
1387 env_ovar_wrong:
1388 env_ovar = OLD_ENV_VALUE;
1389 env_ovalue = OLD_ENV_VAR;
1390 DIAG(TD_OPTIONS, {output_data(
1391 "ENVIRON VALUE and VAR are reversed!\r\n");});
1392
1393 }
1394 }
1395 SB_RESTORE();
1396 #endif
1397
1398 while (!SB_EOF()) {
1399 c = SB_GET();
1400 if ((c == env_ovar) || (c == ENV_USERVAR))
1401 break;
1402 }
1403 }
1404
1405 if (SB_EOF())
1406 return;
1407
1408 cp = varp = (char *)subpointer;
1409 valp = 0;
1410
1411 while (!SB_EOF()) {
1412 c = SB_GET();
1413 if (subchar == TELOPT_OLD_ENVIRON) {
1414 if (c == env_ovar)
1415 c = NEW_ENV_VAR;
1416 else if (c == env_ovalue)
1417 c = NEW_ENV_VALUE;
1418 }
1419 switch (c) {
1420
1421 case NEW_ENV_VALUE:
1422 *cp = '\0';
1423 cp = valp = (char *)subpointer;
1424 break;
1425
1426 case NEW_ENV_VAR:
1427 case ENV_USERVAR:
1428 *cp = '\0';
1429 if (envvarok(varp)) {
1430 if (valp)
1431 (void)setenv(varp, valp, 1);
1432 else
1433 unsetenv(varp);
1434 }
1435 cp = varp = (char *)subpointer;
1436 valp = 0;
1437 break;
1438
1439 case ENV_ESC:
1440 if (SB_EOF())
1441 break;
1442 c = SB_GET();
1443 /* FALL THROUGH */
1444 default:
1445 *cp++ = c;
1446 break;
1447 }
1448 }
1449 *cp = '\0';
1450 if (envvarok(varp)) {
1451 if (valp)
1452 (void)setenv(varp, valp, 1);
1453 else
1454 unsetenv(varp);
1455 }
1456 break;
1457 } /* end of case TELOPT_NEW_ENVIRON */
1458 #ifdef AUTHENTICATION
1459 case TELOPT_AUTHENTICATION:
1460 if (SB_EOF())
1461 break;
1462 switch(SB_GET()) {
1463 case TELQUAL_SEND:
1464 case TELQUAL_REPLY:
1465 /*
1466 * These are sent by us and cannot be sent by
1467 * the client.
1468 */
1469 break;
1470 case TELQUAL_IS:
1471 auth_is(subpointer, SB_LEN());
1472 break;
1473 case TELQUAL_NAME:
1474 auth_name(subpointer, SB_LEN());
1475 break;
1476 }
1477 break;
1478 #endif
1479 #ifdef ENCRYPTION
1480 case TELOPT_ENCRYPT:
1481 if (SB_EOF())
1482 break;
1483 switch(SB_GET()) {
1484 case ENCRYPT_SUPPORT:
1485 encrypt_support(subpointer, SB_LEN());
1486 break;
1487 case ENCRYPT_IS:
1488 encrypt_is(subpointer, SB_LEN());
1489 break;
1490 case ENCRYPT_REPLY:
1491 encrypt_reply(subpointer, SB_LEN());
1492 break;
1493 case ENCRYPT_START:
1494 encrypt_start(subpointer, SB_LEN());
1495 break;
1496 case ENCRYPT_END:
1497 encrypt_end();
1498 break;
1499 case ENCRYPT_REQSTART:
1500 encrypt_request_start(subpointer, SB_LEN());
1501 break;
1502 case ENCRYPT_REQEND:
1503 /*
1504 * We can always send an REQEND so that we cannot
1505 * get stuck encrypting. We should only get this
1506 * if we have been able to get in the correct mode
1507 * anyhow.
1508 */
1509 encrypt_request_end();
1510 break;
1511 case ENCRYPT_ENC_KEYID:
1512 encrypt_enc_keyid(subpointer, SB_LEN());
1513 break;
1514 case ENCRYPT_DEC_KEYID:
1515 encrypt_dec_keyid(subpointer, SB_LEN());
1516 break;
1517 default:
1518 break;
1519 }
1520 break;
1521 #endif /* ENCRYPTION */
1522
1523 default:
1524 break;
1525 } /* end of switch */
1526
1527 } /* end of suboption */
1528
1529 #ifdef LINEMODE
1530 void
1531 doclientstat(void)
1532 {
1533 clientstat(TELOPT_LINEMODE, WILL, 0);
1534 }
1535 #endif /* LINEMODE */
1536
1537 void
1538 send_status(void)
1539 {
1540 #define ADD(c) \
1541 do { \
1542 if (ep > ncp) \
1543 *ncp++ = c; \
1544 else \
1545 goto trunc; \
1546 } while (0)
1547 #define ADD_DATA(c) \
1548 do { \
1549 ADD(c); if (c == SE || c == IAC) ADD(c); \
1550 } while (0)
1551
1552 unsigned char statusbuf[256];
1553 unsigned char *ep;
1554 unsigned char *ncp;
1555 unsigned char i;
1556
1557 ncp = statusbuf;
1558 ep = statusbuf + sizeof(statusbuf);
1559
1560 netflush(); /* get rid of anything waiting to go out */
1561
1562 ADD(IAC);
1563 ADD(SB);
1564 ADD(TELOPT_STATUS);
1565 ADD(TELQUAL_IS);
1566
1567 /*
1568 * We check the want_state rather than the current state,
1569 * because if we received a DO/WILL for an option that we
1570 * don't support, and the other side didn't send a DONT/WONT
1571 * in response to our WONT/DONT, then the "state" will be
1572 * WILL/DO, and the "want_state" will be WONT/DONT. We
1573 * need to go by the latter.
1574 */
1575 for (i = 0; i < (unsigned char)NTELOPTS; i++) {
1576 if (my_want_state_is_will(i)) {
1577 ADD(WILL);
1578 ADD_DATA(i);
1579 }
1580 if (his_want_state_is_will(i)) {
1581 ADD(DO);
1582 ADD_DATA(i);
1583 }
1584 }
1585
1586 if (his_want_state_is_will(TELOPT_LFLOW)) {
1587 ADD(SB);
1588 ADD(TELOPT_LFLOW);
1589 if (flowmode) {
1590 ADD(LFLOW_ON);
1591 } else {
1592 ADD(LFLOW_OFF);
1593 }
1594 ADD(SE);
1595
1596 if (restartany >= 0) {
1597 ADD(SB);
1598 ADD(TELOPT_LFLOW);
1599 if (restartany) {
1600 ADD(LFLOW_RESTART_ANY);
1601 } else {
1602 ADD(LFLOW_RESTART_XON);
1603 }
1604 ADD(SE);
1605 }
1606 }
1607
1608 #ifdef LINEMODE
1609 if (his_want_state_is_will(TELOPT_LINEMODE)) {
1610 unsigned char *cp, *cpe;
1611 int len;
1612
1613 ADD(SB);
1614 ADD(TELOPT_LINEMODE);
1615 ADD(LM_MODE);
1616 ADD_DATA(editmode);
1617 ADD(SE);
1618
1619 ADD(SB);
1620 ADD(TELOPT_LINEMODE);
1621 ADD(LM_SLC);
1622 start_slc(0);
1623 send_slc();
1624 len = end_slc(&cp);
1625 for (cpe = cp + len; cp < cpe; cp++)
1626 ADD_DATA(*cp);
1627 ADD(SE);
1628 }
1629 #endif /* LINEMODE */
1630
1631 ADD(IAC);
1632 ADD(SE);
1633
1634 writenet(statusbuf, ncp - statusbuf);
1635 netflush(); /* Send it on its way */
1636
1637 DIAG(TD_OPTIONS,
1638 {printsub('>', statusbuf, ncp - statusbuf); netflush();});
1639 return;
1640
1641 trunc:
1642 /* XXX bark? */
1643 return;
1644 #undef ADD
1645 #undef ADD_DATA
1646 }
1647
1648 int
1649 output_data(const char *format, ...)
1650 {
1651 va_list args;
1652 size_t remaining, ret;
1653
1654 va_start(args, format);
1655 remaining = BUFSIZ - (nfrontp - netobuf);
1656 /* try a netflush() if the room is too low */
1657 if (strlen(format) > remaining || BUFSIZ / 4 > remaining) {
1658 netflush();
1659 remaining = BUFSIZ - (nfrontp - netobuf);
1660 }
1661 ret = vsnprintf(nfrontp, remaining, format, args);
1662 nfrontp += ((ret < remaining - 1) ? ret : remaining - 1);
1663 va_end(args);
1664 return ret;
1665 }
1666
1667 int
1668 output_datalen(const char *buf, size_t l)
1669 {
1670 size_t remaining;
1671
1672 remaining = BUFSIZ - (nfrontp - netobuf);
1673 if (remaining < l) {
1674 netflush();
1675 remaining = BUFSIZ - (nfrontp - netobuf);
1676 }
1677 if (remaining < l)
1678 return -1;
1679 memmove(nfrontp, buf, l);
1680 nfrontp += l;
1681 return (int)l;
1682 }
NetBSD on the FriendlyARM MINI2440