?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Remove building with NOCRYPTO option
[minix.git] / libexec / telnetd / state.c
blob7021ff3e43a672d28df93ebb48f7aadad0026ab2
1 /* $NetBSD: state.c,v 1.29 2012/01/09 16:36:48 christos 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 1.29 2012/01/09 16:36:48 christos 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 int not42 = 1;
49
50 /*
51 * Buffer for sub-options, and macros
52 * for suboptions buffer manipulations
53 */
54 unsigned char subbuffer[4096], *subpointer= subbuffer, *subend= subbuffer;
55
56 #define SB_CLEAR() subpointer = subbuffer
57 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
58 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
59 *subpointer++ = (c); \
60 }
61 #define SB_GET() ((*subpointer++)&0xff)
62 #define SB_EOF() (subpointer >= subend)
63 #define SB_LEN() (subend - subpointer)
64
65 #ifdef ENV_HACK
66 unsigned char *subsave;
67 #define SB_SAVE() subsave = subpointer;
68 #define SB_RESTORE() subpointer = subsave;
69 #endif
70
71
72 /*
73 * State for recv fsm
74 */
75 #define TS_DATA 0 /* base state */
76 #define TS_IAC 1 /* look for double IAC's */
77 #define TS_CR 2 /* CR-LF ->'s CR */
78 #define TS_SB 3 /* throw away begin's... */
79 #define TS_SE 4 /* ...end's (suboption negotiation) */
80 #define TS_WILL 5 /* will option negotiation */
81 #define TS_WONT 6 /* wont " */
82 #define TS_DO 7 /* do " */
83 #define TS_DONT 8 /* dont " */
84
85 void
86 telrcv(void)
87 {
88 int c;
89 static int state = TS_DATA;
90
91 while (ncc > 0) {
92 if ((&ptyobuf[BUFSIZ] - pfrontp) < 2)
93 break;
94 c = *netip++ & 0377, ncc--;
95 #ifdef ENCRYPTION
96 if (decrypt_input)
97 c = (*decrypt_input)(c);
98 #endif /* ENCRYPTION */
99 switch (state) {
100
101 case TS_CR:
102 state = TS_DATA;
103 /* Strip off \n or \0 after a \r */
104 if ((c == 0) || (c == '\n')) {
105 break;
106 }
107 /* FALL THROUGH */
108
109 case TS_DATA:
110 if (c == IAC) {
111 state = TS_IAC;
112 break;
113 }
114 /*
115 * We now map \r\n ==> \r for pragmatic reasons.
116 * Many client implementations send \r\n when
117 * the user hits the CarriageReturn key.
118 *
119 * We USED to map \r\n ==> \n, since \r\n says
120 * that we want to be in column 1 of the next
121 * printable line, and \n is the standard
122 * unix way of saying that (\r is only good
123 * if CRMOD is set, which it normally is).
124 */
125 if ((c == '\r') && his_state_is_wont(TELOPT_BINARY)) {
126 #ifndef __minix
127 int nc = *netip;
128 #endif /* !__minix */
129 #ifdef ENCRYPTION
130 if (decrypt_input)
131 nc = (*decrypt_input)(nc & 0xff);
132 #endif /* ENCRYPTION */
133 #ifdef LINEMODE
134 /*
135 * If we are operating in linemode,
136 * convert to local end-of-line.
137 */
138 if (linemode && (ncc > 0) && (('\n' == nc) ||
139 ((0 == nc) && tty_iscrnl())) ) {
140 netip++; ncc--;
141 c = '\n';
142 } else
143 #endif
144 {
145 #ifdef ENCRYPTION
146 if (decrypt_input)
147 (void)(*decrypt_input)(-1);
148 #endif /* ENCRYPTION */
149 state = TS_CR;
150 }
151 }
152 *pfrontp++ = c;
153 break;
154
155 case TS_IAC:
156 gotiac: switch (c) {
157
158 /*
159 * Send the process on the pty side an
160 * interrupt. Do this with a NULL or
161 * interrupt char; depending on the tty mode.
162 */
163 case IP:
164 DIAG(TD_OPTIONS,
165 printoption("td: recv IAC", c));
166 interrupt();
167 break;
168
169 case BREAK:
170 DIAG(TD_OPTIONS,
171 printoption("td: recv IAC", c));
172 sendbrk();
173 break;
174
175 /*
176 * Are You There?
177 */
178 case AYT:
179 DIAG(TD_OPTIONS,
180 printoption("td: recv IAC", c));
181 recv_ayt();
182 break;
183
184 /*
185 * Abort Output
186 */
187 case AO:
188 {
189 DIAG(TD_OPTIONS,
190 printoption("td: recv IAC", c));
191 ptyflush(); /* half-hearted */
192 init_termbuf();
193
194 if (slctab[SLC_AO].sptr &&
195 *slctab[SLC_AO].sptr != (cc_t)(_POSIX_VDISABLE)) {
196 *pfrontp++ =
197 (unsigned char)*slctab[SLC_AO].sptr;
198 }
199
200 netclear(); /* clear buffer back */
201 output_data("%c%c", IAC, DM);
202 neturg = nfrontp - 1; /* off by one XXX */
203 DIAG(TD_OPTIONS,
204 printoption("td: send IAC", DM));
205 break;
206 }
207
208 /*
209 * Erase Character and
210 * Erase Line
211 */
212 case EC:
213 case EL:
214 {
215 cc_t ch;
216
217 DIAG(TD_OPTIONS,
218 printoption("td: recv IAC", c));
219 ptyflush(); /* half-hearted */
220 init_termbuf();
221 if (c == EC)
222 ch = *slctab[SLC_EC].sptr;
223 else
224 ch = *slctab[SLC_EL].sptr;
225 if (ch != (cc_t)(_POSIX_VDISABLE))
226 *pfrontp++ = (unsigned char)ch;
227 break;
228 }
229
230 /*
231 * Check for urgent data...
232 */
233 case DM:
234 DIAG(TD_OPTIONS,
235 printoption("td: recv IAC", c));
236 SYNCHing = stilloob(net);
237 settimer(gotDM);
238 break;
239
240
241 /*
242 * Begin option subnegotiation...
243 */
244 case SB:
245 state = TS_SB;
246 SB_CLEAR();
247 continue;
248
249 case WILL:
250 state = TS_WILL;
251 continue;
252
253 case WONT:
254 state = TS_WONT;
255 continue;
256
257 case DO:
258 state = TS_DO;
259 continue;
260
261 case DONT:
262 state = TS_DONT;
263 continue;
264 case EOR:
265 if (his_state_is_will(TELOPT_EOR))
266 doeof();
267 break;
268
269 /*
270 * Handle RFC 10xx Telnet linemode option additions
271 * to command stream (EOF, SUSP, ABORT).
272 */
273 case xEOF:
274 doeof();
275 break;
276
277 case SUSP:
278 sendsusp();
279 break;
280
281 case ABORT:
282 sendbrk();
283 break;
284
285 case IAC:
286 *pfrontp++ = c;
287 break;
288 }
289 state = TS_DATA;
290 break;
291
292 case TS_SB:
293 if (c == IAC) {
294 state = TS_SE;
295 } else {
296 SB_ACCUM(c);
297 }
298 break;
299
300 case TS_SE:
301 if (c != SE) {
302 if (c != IAC) {
303 /*
304 * bad form of suboption negotiation.
305 * handle it in such a way as to avoid
306 * damage to local state. Parse
307 * suboption buffer found so far,
308 * then treat remaining stream as
309 * another command sequence.
310 */
311
312 /* for DIAGNOSTICS */
313 SB_ACCUM(IAC);
314 SB_ACCUM(c);
315 subpointer -= 2;
316
317 SB_TERM();
318 suboption();
319 state = TS_IAC;
320 goto gotiac;
321 }
322 SB_ACCUM(c);
323 state = TS_SB;
324 } else {
325 /* for DIAGNOSTICS */
326 SB_ACCUM(IAC);
327 SB_ACCUM(SE);
328 subpointer -= 2;
329
330 SB_TERM();
331 suboption(); /* handle sub-option */
332 state = TS_DATA;
333 }
334 break;
335
336 case TS_WILL:
337 willoption(c);
338 state = TS_DATA;
339 continue;
340
341 case TS_WONT:
342 wontoption(c);
343 state = TS_DATA;
344 continue;
345
346 case TS_DO:
347 dooption(c);
348 state = TS_DATA;
349 continue;
350
351 case TS_DONT:
352 dontoption(c);
353 state = TS_DATA;
354 continue;
355
356 default:
357 syslog(LOG_ERR, "panic state=%d", state);
358 printf("telnetd: panic state=%d\n", state);
359 exit(1);
360 }
361 }
362 } /* end of telrcv */
363
364 /*
365 * The will/wont/do/dont state machines are based on Dave Borman's
366 * Telnet option processing state machine.
367 *
368 * These correspond to the following states:
369 * my_state = the last negotiated state
370 * want_state = what I want the state to go to
371 * want_resp = how many requests I have sent
372 * All state defaults are negative, and resp defaults to 0.
373 *
374 * When initiating a request to change state to new_state:
375 *
376 * if ((want_resp == 0 && new_state == my_state) || want_state == new_state) {
377 * do nothing;
378 * } else {
379 * want_state = new_state;
380 * send new_state;
381 * want_resp++;
382 * }
383 *
384 * When receiving new_state:
385 *
386 * if (want_resp) {
387 * want_resp--;
388 * if (want_resp && (new_state == my_state))
389 * want_resp--;
390 * }
391 * if ((want_resp == 0) && (new_state != want_state)) {
392 * if (ok_to_switch_to new_state)
393 * want_state = new_state;
394 * else
395 * want_resp++;
396 * send want_state;
397 * }
398 * my_state = new_state;
399 *
400 * Note that new_state is implied in these functions by the function itself.
401 * will and do imply positive new_state, wont and dont imply negative.
402 *
403 * Finally, there is one catch. If we send a negative response to a
404 * positive request, my_state will be the positive while want_state will
405 * remain negative. my_state will revert to negative when the negative
406 * acknowlegment arrives from the peer. Thus, my_state generally tells
407 * us not only the last negotiated state, but also tells us what the peer
408 * wants to be doing as well. It is important to understand this difference
409 * as we may wish to be processing data streams based on our desired state
410 * (want_state) or based on what the peer thinks the state is (my_state).
411 *
412 * This all works fine because if the peer sends a positive request, the data
413 * that we receive prior to negative acknowlegment will probably be affected
414 * by the positive state, and we can process it as such (if we can; if we
415 * can't then it really doesn't matter). If it is that important, then the
416 * peer probably should be buffering until this option state negotiation
417 * is complete.
418 *
419 */
420 void
421 send_do(int option, int init)
422 {
423 if (init) {
424 if ((do_dont_resp[option] == 0 && his_state_is_will(option)) ||
425 his_want_state_is_will(option))
426 return;
427 /*
428 * Special case for TELOPT_TM: We send a DO, but pretend
429 * that we sent a DONT, so that we can send more DOs if
430 * we want to.
431 */
432 if (option == TELOPT_TM)
433 set_his_want_state_wont(option);
434 else
435 set_his_want_state_will(option);
436 do_dont_resp[option]++;
437 }
438 (void) output_data("%c%c%c", IAC, DO, option);
439
440 DIAG(TD_OPTIONS, printoption("td: send do", option));
441 }
442
443 #ifdef LINEMODE
444 extern void doclientstat(void);
445 #endif
446 #if 0
447 #ifdef AUTHENTICATION
448 extern void auth_request(void); /* libtelnet */
449 #endif
450 #ifdef ENCRYPTION
451 extern void encrypt_send_support(void);
452 #endif /* ENCRYPTION */
453 #endif
454
455 void
456 willoption(int option)
457 {
458 int changeok = 0;
459 void (*func)(void) = 0;
460
461 /*
462 * process input from peer.
463 */
464
465 DIAG(TD_OPTIONS, printoption("td: recv will", option));
466
467 if (do_dont_resp[option]) {
468 do_dont_resp[option]--;
469 if (do_dont_resp[option] && his_state_is_will(option))
470 do_dont_resp[option]--;
471 }
472 if (do_dont_resp[option] == 0) {
473 if (his_want_state_is_wont(option)) {
474 switch (option) {
475
476 case TELOPT_BINARY:
477 init_termbuf();
478 tty_binaryin(1);
479 set_termbuf();
480 changeok++;
481 break;
482
483 case TELOPT_ECHO:
484 /*
485 * See comments below for more info.
486 */
487 not42 = 0; /* looks like a 4.2 system */
488 break;
489
490 case TELOPT_TM:
491 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
492 /*
493 * This telnetd implementation does not really
494 * support timing marks, it just uses them to
495 * support the kludge linemode stuff. If we
496 * receive a will or wont TM in response to our
497 * do TM request that may have been sent to
498 * determine kludge linemode support, process
499 * it, otherwise TM should get a negative
500 * response back.
501 */
502 /*
503 * Handle the linemode kludge stuff.
504 * If we are not currently supporting any
505 * linemode at all, then we assume that this
506 * is the client telling us to use kludge
507 * linemode in response to our query. Set the
508 * linemode type that is to be supported, note
509 * that the client wishes to use linemode, and
510 * eat the will TM as though it never arrived.
511 */
512 if (lmodetype < KLUDGE_LINEMODE) {
513 lmodetype = KLUDGE_LINEMODE;
514 clientstat(TELOPT_LINEMODE, WILL, 0);
515 send_wont(TELOPT_SGA, 1);
516 } else if (lmodetype == NO_AUTOKLUDGE) {
517 lmodetype = KLUDGE_OK;
518 }
519 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
520 /*
521 * We never respond to a WILL TM, and
522 * we leave the state WONT.
523 */
524 return;
525
526 case TELOPT_LFLOW:
527 /*
528 * If we are going to support flow control
529 * option, then don't worry peer that we can't
530 * change the flow control characters.
531 */
532 slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS;
533 slctab[SLC_XON].defset.flag |= SLC_DEFAULT;
534 slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS;
535 slctab[SLC_XOFF].defset.flag |= SLC_DEFAULT;
536 case TELOPT_TTYPE:
537 case TELOPT_SGA:
538 case TELOPT_NAWS:
539 case TELOPT_TSPEED:
540 case TELOPT_XDISPLOC:
541 case TELOPT_NEW_ENVIRON:
542 case TELOPT_OLD_ENVIRON:
543 changeok++;
544 break;
545
546 #ifdef LINEMODE
547 case TELOPT_LINEMODE:
548 # ifdef KLUDGELINEMODE
549 /*
550 * Note client's desire to use linemode.
551 */
552 lmodetype = REAL_LINEMODE;
553 # endif /* KLUDGELINEMODE */
554 func = doclientstat;
555 changeok++;
556 break;
557 #endif /* LINEMODE */
558
559 #ifdef AUTHENTICATION
560 case TELOPT_AUTHENTICATION:
561 func = auth_request;
562 changeok++;
563 break;
564 #endif
565
566 #ifdef ENCRYPTION
567 case TELOPT_ENCRYPT:
568 func = encrypt_send_support;
569 changeok++;
570 break;
571 #endif /* ENCRYPTION */
572
573 default:
574 break;
575 }
576 if (changeok) {
577 set_his_want_state_will(option);
578 send_do(option, 0);
579 } else {
580 do_dont_resp[option]++;
581 send_dont(option, 0);
582 }
583 } else {
584 /*
585 * Option processing that should happen when
586 * we receive conformation of a change in
587 * state that we had requested.
588 */
589 switch (option) {
590 case TELOPT_ECHO:
591 not42 = 0; /* looks like a 4.2 system */
592 /*
593 * Egads, he responded "WILL ECHO". Turn
594 * it off right now!
595 */
596 send_dont(option, 1);
597 /*
598 * "WILL ECHO". Kludge upon kludge!
599 * A 4.2 client is now echoing user input at
600 * the tty. This is probably undesireable and
601 * it should be stopped. The client will
602 * respond WONT TM to the DO TM that we send to
603 * check for kludge linemode. When the WONT TM
604 * arrives, linemode will be turned off and a
605 * change propogated to the pty. This change
606 * will cause us to process the new pty state
607 * in localstat(), which will notice that
608 * linemode is off and send a WILL ECHO
609 * so that we are properly in character mode and
610 * all is well.
611 */
612 break;
613 #ifdef LINEMODE
614 case TELOPT_LINEMODE:
615 # ifdef KLUDGELINEMODE
616 /*
617 * Note client's desire to use linemode.
618 */
619 lmodetype = REAL_LINEMODE;
620 # endif /* KLUDGELINEMODE */
621 func = doclientstat;
622 break;
623 #endif /* LINEMODE */
624
625 #ifdef AUTHENTICATION
626 case TELOPT_AUTHENTICATION:
627 func = auth_request;
628 break;
629 #endif
630
631 #ifdef ENCRYPTION
632 case TELOPT_ENCRYPT:
633 func = encrypt_send_support;
634 break;
635 #endif /* ENCRYPTION */
636
637 case TELOPT_LFLOW:
638 func = flowstat;
639 break;
640 }
641 }
642 }
643 set_his_state_will(option);
644 if (func)
645 (*func)();
646 } /* end of willoption */
647
648 void
649 send_dont(int option, int init)
650 {
651 if (init) {
652 if ((do_dont_resp[option] == 0 && his_state_is_wont(option)) ||
653 his_want_state_is_wont(option))
654 return;
655 set_his_want_state_wont(option);
656 do_dont_resp[option]++;
657 }
658 (void) output_data("%c%c%c", IAC, DONT, option);
659
660 DIAG(TD_OPTIONS, printoption("td: send dont", option));
661 }
662
663 void
664 wontoption(int option)
665 {
666 /*
667 * Process client input.
668 */
669
670 DIAG(TD_OPTIONS, printoption("td: recv wont", option));
671
672 if (do_dont_resp[option]) {
673 do_dont_resp[option]--;
674 if (do_dont_resp[option] && his_state_is_wont(option))
675 do_dont_resp[option]--;
676 }
677 if (do_dont_resp[option] == 0) {
678 if (his_want_state_is_will(option)) {
679 /* it is always ok to change to negative state */
680 switch (option) {
681 case TELOPT_ECHO:
682 not42 = 1; /* doesn't seem to be a 4.2 system */
683 break;
684
685 case TELOPT_BINARY:
686 init_termbuf();
687 tty_binaryin(0);
688 set_termbuf();
689 break;
690
691 #ifdef LINEMODE
692 case TELOPT_LINEMODE:
693 # ifdef KLUDGELINEMODE
694 /*
695 * If real linemode is supported, then client is
696 * asking to turn linemode off.
697 */
698 if (lmodetype != REAL_LINEMODE)
699 break;
700 /* XXX double-check this --thorpej */
701 lmodetype = KLUDGE_LINEMODE;
702 # endif /* KLUDGELINEMODE */
703 clientstat(TELOPT_LINEMODE, WONT, 0);
704 break;
705 #endif /* LINEMODE */
706
707 case TELOPT_TM:
708 /*
709 * If we get a WONT TM, and had sent a DO TM,
710 * don't respond with a DONT TM, just leave it
711 * as is. Short circut the state machine to
712 * achieve this.
713 */
714 set_his_want_state_wont(TELOPT_TM);
715 return;
716
717 case TELOPT_LFLOW:
718 /*
719 * If we are not going to support flow control
720 * option, then let peer know that we can't
721 * change the flow control characters.
722 */
723 slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS;
724 slctab[SLC_XON].defset.flag |= SLC_CANTCHANGE;
725 slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS;
726 slctab[SLC_XOFF].defset.flag |= SLC_CANTCHANGE;
727 break;
728
729 #ifdef AUTHENTICATION
730 case TELOPT_AUTHENTICATION:
731 auth_finished(0, AUTH_REJECT);
732 break;
733 #endif
734
735 /*
736 * For options that we might spin waiting for
737 * sub-negotiation, if the client turns off the
738 * option rather than responding to the request,
739 * we have to treat it here as if we got a response
740 * to the sub-negotiation, (by updating the timers)
741 * so that we'll break out of the loop.
742 */
743 case TELOPT_TTYPE:
744 settimer(ttypesubopt);
745 break;
746
747 case TELOPT_TSPEED:
748 settimer(tspeedsubopt);
749 break;
750
751 case TELOPT_XDISPLOC:
752 settimer(xdisplocsubopt);
753 break;
754
755 case TELOPT_OLD_ENVIRON:
756 settimer(oenvironsubopt);
757 break;
758
759 case TELOPT_NEW_ENVIRON:
760 settimer(environsubopt);
761 break;
762
763 default:
764 break;
765 }
766 set_his_want_state_wont(option);
767 if (his_state_is_will(option))
768 send_dont(option, 0);
769 } else {
770 switch (option) {
771 case TELOPT_TM:
772 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
773 if (lmodetype < NO_AUTOKLUDGE) {
774 lmodetype = NO_LINEMODE;
775 clientstat(TELOPT_LINEMODE, WONT, 0);
776 send_will(TELOPT_SGA, 1);
777 send_will(TELOPT_ECHO, 1);
778 }
779 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
780 break;
781
782 #ifdef AUTHENTICATION
783 case TELOPT_AUTHENTICATION:
784 auth_finished(0, AUTH_REJECT);
785 break;
786 #endif
787 default:
788 break;
789 }
790 }
791 }
792 set_his_state_wont(option);
793
794 } /* end of wontoption */
795
796 void
797 send_will(int option, int init)
798 {
799 if (init) {
800 if ((will_wont_resp[option] == 0 && my_state_is_will(option))||
801 my_want_state_is_will(option))
802 return;
803 set_my_want_state_will(option);
804 will_wont_resp[option]++;
805 }
806 (void) output_data("%c%c%c", IAC, WILL, option);
807
808 DIAG(TD_OPTIONS, printoption("td: send will", option));
809 }
810
811 #if !defined(LINEMODE) || !defined(KLUDGELINEMODE)
812 /*
813 * When we get a DONT SGA, we will try once to turn it
814 * back on. If the other side responds DONT SGA, we
815 * leave it at that. This is so that when we talk to
816 * clients that understand KLUDGELINEMODE but not LINEMODE,
817 * we'll keep them in char-at-a-time mode.
818 */
819 int turn_on_sga = 0;
820 #endif
821
822 void
823 dooption(int option)
824 {
825 int changeok = 0;
826
827 /*
828 * Process client input.
829 */
830
831 DIAG(TD_OPTIONS, printoption("td: recv do", option));
832
833 if (will_wont_resp[option]) {
834 will_wont_resp[option]--;
835 if (will_wont_resp[option] && my_state_is_will(option))
836 will_wont_resp[option]--;
837 }
838 if ((will_wont_resp[option] == 0) && (my_want_state_is_wont(option))) {
839 switch (option) {
840 case TELOPT_ECHO:
841 #ifdef LINEMODE
842 # ifdef KLUDGELINEMODE
843 if (lmodetype == NO_LINEMODE)
844 # else
845 if (his_state_is_wont(TELOPT_LINEMODE))
846 # endif
847 #endif
848 {
849 init_termbuf();
850 tty_setecho(1);
851 set_termbuf();
852 }
853 changeok++;
854 break;
855
856 case TELOPT_BINARY:
857 init_termbuf();
858 tty_binaryout(1);
859 set_termbuf();
860 changeok++;
861 break;
862
863 case TELOPT_SGA:
864 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
865 /*
866 * If kludge linemode is in use, then we must
867 * process an incoming do SGA for linemode
868 * purposes.
869 */
870 if (lmodetype == KLUDGE_LINEMODE) {
871 /*
872 * Receipt of "do SGA" in kludge
873 * linemode is the peer asking us to
874 * turn off linemode. Make note of
875 * the request.
876 */
877 clientstat(TELOPT_LINEMODE, WONT, 0);
878 /*
879 * If linemode did not get turned off
880 * then don't tell peer that we did.
881 * Breaking here forces a wont SGA to
882 * be returned.
883 */
884 if (linemode)
885 break;
886 }
887 #else
888 turn_on_sga = 0;
889 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
890 changeok++;
891 break;
892
893 case TELOPT_STATUS:
894 changeok++;
895 break;
896
897 case TELOPT_TM:
898 /*
899 * Special case for TM. We send a WILL, but
900 * pretend we sent a WONT.
901 */
902 send_will(option, 0);
903 set_my_want_state_wont(option);
904 set_my_state_wont(option);
905 return;
906
907 case TELOPT_LOGOUT:
908 /*
909 * When we get a LOGOUT option, respond
910 * with a WILL LOGOUT, make sure that
911 * it gets written out to the network,
912 * and then just go away...
913 */
914 set_my_want_state_will(TELOPT_LOGOUT);
915 send_will(TELOPT_LOGOUT, 0);
916 set_my_state_will(TELOPT_LOGOUT);
917 (void)netflush();
918 cleanup(0);
919 /* NOT REACHED */
920 break;
921
922 #ifdef ENCRYPTION
923 case TELOPT_ENCRYPT:
924 changeok++;
925 break;
926 #endif /* ENCRYPTION */
927
928 case TELOPT_LINEMODE:
929 case TELOPT_TTYPE:
930 case TELOPT_NAWS:
931 case TELOPT_TSPEED:
932 case TELOPT_LFLOW:
933 case TELOPT_XDISPLOC:
934 case TELOPT_OLD_ENVIRON:
935 default:
936 break;
937 }
938 if (changeok) {
939 set_my_want_state_will(option);
940 send_will(option, 0);
941 } else {
942 will_wont_resp[option]++;
943 send_wont(option, 0);
944 }
945 }
946 set_my_state_will(option);
947
948 } /* end of dooption */
949
950 void
951 send_wont(int option, int init)
952 {
953 if (init) {
954 if ((will_wont_resp[option] == 0 && my_state_is_wont(option)) ||
955 my_want_state_is_wont(option))
956 return;
957 set_my_want_state_wont(option);
958 will_wont_resp[option]++;
959 }
960 (void) output_data("%c%c%c", IAC, WONT, option);
961
962 DIAG(TD_OPTIONS, printoption("td: send wont", option));
963 }
964
965 void
966 dontoption(int option)
967 {
968 /*
969 * Process client input.
970 */
971
972
973 DIAG(TD_OPTIONS, printoption("td: recv dont", option));
974
975 if (will_wont_resp[option]) {
976 will_wont_resp[option]--;
977 if (will_wont_resp[option] && my_state_is_wont(option))
978 will_wont_resp[option]--;
979 }
980 if ((will_wont_resp[option] == 0) && (my_want_state_is_will(option))) {
981 switch (option) {
982 case TELOPT_BINARY:
983 init_termbuf();
984 tty_binaryout(0);
985 set_termbuf();
986 break;
987
988 case TELOPT_ECHO: /* we should stop echoing */
989 #ifdef LINEMODE
990 # ifdef KLUDGELINEMODE
991 if ((lmodetype != REAL_LINEMODE) &&
992 (lmodetype != KLUDGE_LINEMODE))
993 # else
994 if (his_state_is_wont(TELOPT_LINEMODE))
995 # endif
996 #endif
997 {
998 init_termbuf();
999 tty_setecho(0);
1000 set_termbuf();
1001 }
1002 break;
1003
1004 case TELOPT_SGA:
1005 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
1006 /*
1007 * If kludge linemode is in use, then we
1008 * must process an incoming do SGA for
1009 * linemode purposes.
1010 */
1011 if ((lmodetype == KLUDGE_LINEMODE) ||
1012 (lmodetype == KLUDGE_OK)) {
1013 /*
1014 * The client is asking us to turn
1015 * linemode on.
1016 */
1017 lmodetype = KLUDGE_LINEMODE;
1018 clientstat(TELOPT_LINEMODE, WILL, 0);
1019 /*
1020 * If we did not turn line mode on,
1021 * then what do we say? Will SGA?
1022 * This violates design of telnet.
1023 * Gross. Very Gross.
1024 */
1025 }
1026 break;
1027 #else
1028 set_my_want_state_wont(option);
1029 if (my_state_is_will(option))
1030 send_wont(option, 0);
1031 set_my_state_wont(option);
1032 if (turn_on_sga ^= 1)
1033 send_will(option, 1);
1034 return;
1035 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
1036
1037 default:
1038 break;
1039 }
1040
1041 set_my_want_state_wont(option);
1042 if (my_state_is_will(option))
1043 send_wont(option, 0);
1044 }
1045 set_my_state_wont(option);
1046
1047 } /* end of dontoption */
1048
1049 #ifdef ENV_HACK
1050 int env_ovar = -1;
1051 int env_ovalue = -1;
1052 #else /* ENV_HACK */
1053 # define env_ovar OLD_ENV_VAR
1054 # define env_ovalue OLD_ENV_VALUE
1055 #endif /* ENV_HACK */
1056
1057 /* envvarok(char*) */
1058 /* check that variable is safe to pass to login or shell */
1059 static int
1060 envvarok(char *varp)
1061 {
1062
1063 if (strcmp(varp, "TERMCAP") && /* to prevent a security hole */
1064 strcmp(varp, "TERMINFO") && /* with tgetent */
1065 strcmp(varp, "TERMPATH") &&
1066 strcmp(varp, "HOME") && /* to prevent the tegetent bug */
1067 strncmp(varp, "LD_", strlen("LD_")) && /* most systems */
1068 strncmp(varp, "_RLD_", strlen("_RLD_")) && /* IRIX */
1069 strcmp(varp, "LIBPATH") && /* AIX */
1070 strcmp(varp, "ENV") &&
1071 strcmp(varp, "BASH_ENV") &&
1072 strcmp(varp, "IFS") &&
1073 strncmp(varp, "KRB5", strlen("KRB5")) && /* Krb5 */
1074 /*
1075 * The above case is a catch-all for now. Here are some of
1076 * the specific ones we must avoid passing, at least until
1077 * we can prove it can be done safely. Keep this list
1078 * around un case someone wants to remove the catch-all.
1079 */
1080 strcmp(varp, "KRB5_CONFIG") && /* Krb5 */
1081 strcmp(varp, "KRB5CCNAME") && /* Krb5 */
1082 strcmp(varp, "KRB5_KTNAME") && /* Krb5 */
1083 strcmp(varp, "KRBTKFILE") && /* Krb4 */
1084 strcmp(varp, "KRB_CONF") && /* CNS 4 */
1085 strcmp(varp, "KRB_REALMS") && /* CNS 4 */
1086 strcmp(varp, "RESOLV_HOST_CONF")) /* Linux */
1087 return (1);
1088 else {
1089 syslog(LOG_INFO, "Rejected the attempt to modify the "
1090 "environment variable \"%s\"", varp);
1091 return (0);
1092 }
1093 }
1094
1095 /*
1096 * suboption()
1097 *
1098 * Look at the sub-option buffer, and try to be helpful to the other
1099 * side.
1100 *
1101 * Currently we recognize:
1102 *
1103 * Terminal type is
1104 * Linemode
1105 * Window size
1106 * Terminal speed
1107 */
1108 void
1109 suboption(void)
1110 {
1111 int subchar;
1112
1113 DIAG(TD_OPTIONS, {netflush(); printsub('<', subpointer, SB_LEN()+2);});
1114
1115 subchar = SB_GET();
1116 switch (subchar) {
1117 case TELOPT_TSPEED: {
1118 int xspeed, rspeed;
1119
1120 if (his_state_is_wont(TELOPT_TSPEED)) /* Ignore if option disabled */
1121 break;
1122
1123 settimer(tspeedsubopt);
1124
1125 if (SB_EOF() || SB_GET() != TELQUAL_IS)
1126 return;
1127
1128 xspeed = atoi((char *)subpointer);
1129
1130 while (SB_GET() != ',' && !SB_EOF());
1131 if (SB_EOF())
1132 return;
1133
1134 rspeed = atoi((char *)subpointer);
1135 clientstat(TELOPT_TSPEED, xspeed, rspeed);
1136
1137 break;
1138
1139 } /* end of case TELOPT_TSPEED */
1140
1141 case TELOPT_TTYPE: { /* Yaaaay! */
1142 char *p;
1143
1144 if (his_state_is_wont(TELOPT_TTYPE)) /* Ignore if option disabled */
1145 break;
1146 settimer(ttypesubopt);
1147
1148 if (SB_EOF() || SB_GET() != TELQUAL_IS) {
1149 return; /* ??? XXX but, this is the most robust */
1150 }
1151
1152 p = terminaltype;
1153
1154 while ((p < (terminaltype + sizeof terminaltype-1)) &&
1155 !SB_EOF()) {
1156 int c;
1157
1158 c = SB_GET();
1159 if (isupper(c)) {
1160 c = tolower(c);
1161 }
1162 *p++ = c; /* accumulate name */
1163 }
1164 *p = 0;
1165 break;
1166 } /* end of case TELOPT_TTYPE */
1167
1168 case TELOPT_NAWS: {
1169 int xwinsize, ywinsize;
1170
1171 if (his_state_is_wont(TELOPT_NAWS)) /* Ignore if option disabled */
1172 break;
1173
1174 if (SB_EOF())
1175 return;
1176 xwinsize = SB_GET() << 8;
1177 if (SB_EOF())
1178 return;
1179 xwinsize |= SB_GET();
1180 if (SB_EOF())
1181 return;
1182 ywinsize = SB_GET() << 8;
1183 if (SB_EOF())
1184 return;
1185 ywinsize |= SB_GET();
1186 clientstat(TELOPT_NAWS, xwinsize, ywinsize);
1187
1188 break;
1189
1190 } /* end of case TELOPT_NAWS */
1191
1192 #ifdef LINEMODE
1193 case TELOPT_LINEMODE: {
1194 int request;
1195
1196 if (his_state_is_wont(TELOPT_LINEMODE)) /* Ignore if option disabled */
1197 break;
1198 /*
1199 * Process linemode suboptions.
1200 */
1201 if (SB_EOF())
1202 break; /* garbage was sent */
1203 request = SB_GET(); /* get will/wont */
1204
1205 if (SB_EOF())
1206 break; /* another garbage check */
1207
1208 if (request == LM_SLC) { /* SLC is not preceded by WILL or WONT */
1209 /*
1210 * Process suboption buffer of slc's
1211 */
1212 start_slc(1);
1213 do_opt_slc(subpointer, SB_LEN());
1214 (void) end_slc(0);
1215 break;
1216 } else if (request == LM_MODE) {
1217 if (SB_EOF())
1218 return;
1219 useeditmode = SB_GET(); /* get mode flag */
1220 clientstat(LM_MODE, 0, 0);
1221 break;
1222 }
1223
1224 if (SB_EOF())
1225 break;
1226 switch (SB_GET()) { /* what suboption? */
1227 case LM_FORWARDMASK:
1228 /*
1229 * According to spec, only server can send request for
1230 * forwardmask, and client can only return a positive response.
1231 * So don't worry about it.
1232 */
1233
1234 default:
1235 break;
1236 }
1237 break;
1238 } /* end of case TELOPT_LINEMODE */
1239 #endif
1240 case TELOPT_STATUS: {
1241 int mode;
1242
1243 if (SB_EOF())
1244 break;
1245 mode = SB_GET();
1246 switch (mode) {
1247 case TELQUAL_SEND:
1248 if (my_state_is_will(TELOPT_STATUS))
1249 send_status();
1250 break;
1251
1252 case TELQUAL_IS:
1253 break;
1254
1255 default:
1256 break;
1257 }
1258 break;
1259 } /* end of case TELOPT_STATUS */
1260
1261 case TELOPT_XDISPLOC: {
1262 if (SB_EOF() || SB_GET() != TELQUAL_IS)
1263 return;
1264 settimer(xdisplocsubopt);
1265 subpointer[SB_LEN()] = '\0';
1266 (void)setenv("DISPLAY", (char *)subpointer, 1);
1267 break;
1268 } /* end of case TELOPT_XDISPLOC */
1269
1270 case TELOPT_NEW_ENVIRON:
1271 case TELOPT_OLD_ENVIRON: {
1272 int c;
1273 char *cp, *varp, *valp;
1274
1275 if (SB_EOF())
1276 return;
1277 c = SB_GET();
1278 if (c == TELQUAL_IS) {
1279 if (subchar == TELOPT_OLD_ENVIRON)
1280 settimer(oenvironsubopt);
1281 else
1282 settimer(environsubopt);
1283 } else if (c != TELQUAL_INFO) {
1284 return;
1285 }
1286
1287 if (subchar == TELOPT_NEW_ENVIRON) {
1288 while (!SB_EOF()) {
1289 c = SB_GET();
1290 if ((c == NEW_ENV_VAR) || (c == ENV_USERVAR))
1291 break;
1292 }
1293 } else
1294 {
1295 #ifdef ENV_HACK
1296 /*
1297 * We only want to do this if we haven't already decided
1298 * whether or not the other side has its VALUE and VAR
1299 * reversed.
1300 */
1301 if (env_ovar < 0) {
1302 int last = -1; /* invalid value */
1303 int empty = 0;
1304 int got_var = 0, got_value = 0, got_uservar = 0;
1305
1306 /*
1307 * The other side might have its VALUE and VAR values
1308 * reversed. To be interoperable, we need to determine
1309 * which way it is. If the first recognized character
1310 * is a VAR or VALUE, then that will tell us what
1311 * type of client it is. If the fist recognized
1312 * character is a USERVAR, then we continue scanning
1313 * the suboption looking for two consecutive
1314 * VAR or VALUE fields. We should not get two
1315 * consecutive VALUE fields, so finding two
1316 * consecutive VALUE or VAR fields will tell us
1317 * what the client is.
1318 */
1319 SB_SAVE();
1320 while (!SB_EOF()) {
1321 c = SB_GET();
1322 switch(c) {
1323 case OLD_ENV_VAR:
1324 if (last < 0 || last == OLD_ENV_VAR
1325 || (empty && (last == OLD_ENV_VALUE)))
1326 goto env_ovar_ok;
1327 got_var++;
1328 last = OLD_ENV_VAR;
1329 break;
1330 case OLD_ENV_VALUE:
1331 if (last < 0 || last == OLD_ENV_VALUE
1332 || (empty && (last == OLD_ENV_VAR)))
1333 goto env_ovar_wrong;
1334 got_value++;
1335 last = OLD_ENV_VALUE;
1336 break;
1337 case ENV_USERVAR:
1338 /* count strings of USERVAR as one */
1339 if (last != ENV_USERVAR)
1340 got_uservar++;
1341 if (empty) {
1342 if (last == OLD_ENV_VALUE)
1343 goto env_ovar_ok;
1344 if (last == OLD_ENV_VAR)
1345 goto env_ovar_wrong;
1346 }
1347 last = ENV_USERVAR;
1348 break;
1349 case ENV_ESC:
1350 if (!SB_EOF())
1351 c = SB_GET();
1352 /* FALL THROUGH */
1353 default:
1354 empty = 0;
1355 continue;
1356 }
1357 empty = 1;
1358 }
1359 if (empty) {
1360 if (last == OLD_ENV_VALUE)
1361 goto env_ovar_ok;
1362 if (last == OLD_ENV_VAR)
1363 goto env_ovar_wrong;
1364 }
1365 /*
1366 * Ok, the first thing was a USERVAR, and there
1367 * are not two consecutive VAR or VALUE commands,
1368 * and none of the VAR or VALUE commands are empty.
1369 * If the client has sent us a well-formed option,
1370 * then the number of VALUEs received should always
1371 * be less than or equal to the number of VARs and
1372 * USERVARs received.
1373 *
1374 * If we got exactly as many VALUEs as VARs and
1375 * USERVARs, the client has the same definitions.
1376 *
1377 * If we got exactly as many VARs as VALUEs and
1378 * USERVARS, the client has reversed definitions.
1379 */
1380 if (got_uservar + got_var == got_value) {
1381 env_ovar_ok:
1382 env_ovar = OLD_ENV_VAR;
1383 env_ovalue = OLD_ENV_VALUE;
1384 } else if (got_uservar + got_value == got_var) {
1385 env_ovar_wrong:
1386 env_ovar = OLD_ENV_VALUE;
1387 env_ovalue = OLD_ENV_VAR;
1388 DIAG(TD_OPTIONS, {output_data(
1389 "ENVIRON VALUE and VAR are reversed!\r\n");});
1390
1391 }
1392 }
1393 SB_RESTORE();
1394 #endif
1395
1396 while (!SB_EOF()) {
1397 c = SB_GET();
1398 if ((c == env_ovar) || (c == ENV_USERVAR))
1399 break;
1400 }
1401 }
1402
1403 if (SB_EOF())
1404 return;
1405
1406 cp = varp = (char *)subpointer;
1407 valp = 0;
1408
1409 while (!SB_EOF()) {
1410 c = SB_GET();
1411 if (subchar == TELOPT_OLD_ENVIRON) {
1412 if (c == env_ovar)
1413 c = NEW_ENV_VAR;
1414 else if (c == env_ovalue)
1415 c = NEW_ENV_VALUE;
1416 }
1417 switch (c) {
1418
1419 case NEW_ENV_VALUE:
1420 *cp = '\0';
1421 cp = valp = (char *)subpointer;
1422 break;
1423
1424 case NEW_ENV_VAR:
1425 case ENV_USERVAR:
1426 *cp = '\0';
1427 if (envvarok(varp)) {
1428 if (valp)
1429 (void)setenv(varp, valp, 1);
1430 else
1431 unsetenv(varp);
1432 }
1433 cp = varp = (char *)subpointer;
1434 valp = 0;
1435 break;
1436
1437 case ENV_ESC:
1438 if (SB_EOF())
1439 break;
1440 c = SB_GET();
1441 /* FALL THROUGH */
1442 default:
1443 *cp++ = c;
1444 break;
1445 }
1446 }
1447 *cp = '\0';
1448 if (envvarok(varp)) {
1449 if (valp)
1450 (void)setenv(varp, valp, 1);
1451 else
1452 unsetenv(varp);
1453 }
1454 break;
1455 } /* end of case TELOPT_NEW_ENVIRON */
1456 #ifdef AUTHENTICATION
1457 case TELOPT_AUTHENTICATION:
1458 if (SB_EOF())
1459 break;
1460 switch(SB_GET()) {
1461 case TELQUAL_SEND:
1462 case TELQUAL_REPLY:
1463 /*
1464 * These are sent by us and cannot be sent by
1465 * the client.
1466 */
1467 break;
1468 case TELQUAL_IS:
1469 auth_is(subpointer, SB_LEN());
1470 break;
1471 case TELQUAL_NAME:
1472 auth_name(subpointer, SB_LEN());
1473 break;
1474 }
1475 break;
1476 #endif
1477 #ifdef ENCRYPTION
1478 case TELOPT_ENCRYPT:
1479 if (SB_EOF())
1480 break;
1481 switch(SB_GET()) {
1482 case ENCRYPT_SUPPORT:
1483 encrypt_support(subpointer, SB_LEN());
1484 break;
1485 case ENCRYPT_IS:
1486 encrypt_is(subpointer, SB_LEN());
1487 break;
1488 case ENCRYPT_REPLY:
1489 encrypt_reply(subpointer, SB_LEN());
1490 break;
1491 case ENCRYPT_START:
1492 encrypt_start(subpointer, SB_LEN());
1493 break;
1494 case ENCRYPT_END:
1495 encrypt_end();
1496 break;
1497 case ENCRYPT_REQSTART:
1498 encrypt_request_start(subpointer, SB_LEN());
1499 break;
1500 case ENCRYPT_REQEND:
1501 /*
1502 * We can always send an REQEND so that we cannot
1503 * get stuck encrypting. We should only get this
1504 * if we have been able to get in the correct mode
1505 * anyhow.
1506 */
1507 encrypt_request_end();
1508 break;
1509 case ENCRYPT_ENC_KEYID:
1510 encrypt_enc_keyid(subpointer, SB_LEN());
1511 break;
1512 case ENCRYPT_DEC_KEYID:
1513 encrypt_dec_keyid(subpointer, SB_LEN());
1514 break;
1515 default:
1516 break;
1517 }
1518 break;
1519 #endif /* ENCRYPTION */
1520
1521 default:
1522 break;
1523 } /* end of switch */
1524
1525 } /* end of suboption */
1526
1527 #ifdef LINEMODE
1528 void
1529 doclientstat(void)
1530 {
1531 clientstat(TELOPT_LINEMODE, WILL, 0);
1532 }
1533 #endif /* LINEMODE */
1534
1535 void
1536 send_status(void)
1537 {
1538 #define ADD(c) \
1539 do { \
1540 if (ep > ncp) \
1541 *ncp++ = c; \
1542 else \
1543 goto trunc; \
1544 } while (0)
1545 #define ADD_DATA(c) \
1546 do { \
1547 ADD(c); if (c == SE || c == IAC) ADD(c); \
1548 } while (0)
1549
1550 unsigned char statusbuf[256];
1551 unsigned char *ep;
1552 unsigned char *ncp;
1553 unsigned char i;
1554
1555 ncp = statusbuf;
1556 ep = statusbuf + sizeof(statusbuf);
1557
1558 netflush(); /* get rid of anything waiting to go out */
1559
1560 ADD(IAC);
1561 ADD(SB);
1562 ADD(TELOPT_STATUS);
1563 ADD(TELQUAL_IS);
1564
1565 /*
1566 * We check the want_state rather than the current state,
1567 * because if we received a DO/WILL for an option that we
1568 * don't support, and the other side didn't send a DONT/WONT
1569 * in response to our WONT/DONT, then the "state" will be
1570 * WILL/DO, and the "want_state" will be WONT/DONT. We
1571 * need to go by the latter.
1572 */
1573 for (i = 0; i < (unsigned char)NTELOPTS; i++) {
1574 if (my_want_state_is_will(i)) {
1575 ADD(WILL);
1576 ADD_DATA(i);
1577 }
1578 if (his_want_state_is_will(i)) {
1579 ADD(DO);
1580 ADD_DATA(i);
1581 }
1582 }
1583
1584 if (his_want_state_is_will(TELOPT_LFLOW)) {
1585 ADD(SB);
1586 ADD(TELOPT_LFLOW);
1587 if (flowmode) {
1588 ADD(LFLOW_ON);
1589 } else {
1590 ADD(LFLOW_OFF);
1591 }
1592 ADD(SE);
1593
1594 if (restartany >= 0) {
1595 ADD(SB);
1596 ADD(TELOPT_LFLOW);
1597 if (restartany) {
1598 ADD(LFLOW_RESTART_ANY);
1599 } else {
1600 ADD(LFLOW_RESTART_XON);
1601 }
1602 ADD(SE);
1603 }
1604 }
1605
1606 #ifdef LINEMODE
1607 if (his_want_state_is_will(TELOPT_LINEMODE)) {
1608 unsigned char *cp, *cpe;
1609 int len;
1610
1611 ADD(SB);
1612 ADD(TELOPT_LINEMODE);
1613 ADD(LM_MODE);
1614 ADD_DATA(editmode);
1615 ADD(SE);
1616
1617 ADD(SB);
1618 ADD(TELOPT_LINEMODE);
1619 ADD(LM_SLC);
1620 start_slc(0);
1621 send_slc();
1622 len = end_slc(&cp);
1623 for (cpe = cp + len; cp < cpe; cp++)
1624 ADD_DATA(*cp);
1625 ADD(SE);
1626 }
1627 #endif /* LINEMODE */
1628
1629 ADD(IAC);
1630 ADD(SE);
1631
1632 writenet(statusbuf, ncp - statusbuf);
1633 netflush(); /* Send it on its way */
1634
1635 DIAG(TD_OPTIONS,
1636 {printsub('>', statusbuf, ncp - statusbuf); netflush();});
1637 return;
1638
1639 trunc:
1640 /* XXX bark? */
1641 return;
1642 #undef ADD
1643 #undef ADD_DATA
1644 }
1645
1646 int
1647 output_data(const char *format, ...)
1648 {
1649 va_list args;
1650 size_t remaining, ret;
1651
1652 va_start(args, format);
1653 remaining = BUFSIZ - (nfrontp - netobuf);
1654 /* try a netflush() if the room is too low */
1655 if (strlen(format) > remaining || BUFSIZ / 4 > remaining) {
1656 netflush();
1657 remaining = BUFSIZ - (nfrontp - netobuf);
1658 }
1659 ret = vsnprintf(nfrontp, remaining, format, args);
1660 nfrontp += ((ret < remaining - 1) ? ret : remaining - 1);
1661 va_end(args);
1662 return ret;
1663 }
1664
1665 int
1666 output_datalen(const char *buf, size_t l)
1667 {
1668 size_t remaining;
1669
1670 remaining = BUFSIZ - (nfrontp - netobuf);
1671 if (remaining < l) {
1672 netflush();
1673 remaining = BUFSIZ - (nfrontp - netobuf);
1674 }
1675 if (remaining < l)
1676 return -1;
1677 memmove(nfrontp, buf, l);
1678 nfrontp += l;
1679 return (int)l;
1680 }
MINIX 3 (repo.or.cz mirror)