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1 /*
2 * Copyright (c) 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35
36 #ifdef __FBSDID
37 __FBSDID("$FreeBSD: src/crypto/telnet/telnet/telnet.c,v 1.4.2.5 2002/04/13 10:59:08 markm Exp $");
38 #endif
39
40 #ifndef __unused
41 #define __unused __attribute__((__unused__))
42 #endif
43
44 #ifndef lint
45 static const char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95";
46 #endif
47
48 #include <sys/types.h>
49
50 /* By the way, we need to include curses.h before telnet.h since,
51 * among other things, telnet.h #defines 'DO', which is a variable
52 * declared in curses.h.
53 */
54
55 #include <ctype.h>
56 #include <curses.h>
57 #include <signal.h>
58 #include <stdlib.h>
59 #include <unistd.h>
60 #include <arpa/telnet.h>
61
62 #include "ring.h"
63
64 #include "defines.h"
65 #include "externs.h"
66 #include "types.h"
67 #include "general.h"
68
69 #ifdef AUTHENTICATION
70 #include <libtelnet/auth.h>
71 #endif
72 #ifdef ENCRYPTION
73 #include <libtelnet/encrypt.h>
74 #endif
75 #include <libtelnet/misc.h>
76 \f
77 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
78
79 static unsigned char subbuffer[SUBBUFSIZE],
80 *subpointer, *subend; /* buffer for sub-options */
81 #define SB_CLEAR() subpointer = subbuffer;
82 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
83 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
84 *subpointer++ = (c); \
85 }
86
87 #define SB_GET() ((*subpointer++)&0xff)
88 #define SB_PEEK() ((*subpointer)&0xff)
89 #define SB_EOF() (subpointer >= subend)
90 #define SB_LEN() (subend - subpointer)
91
92 char options[256]; /* The combined options */
93 char do_dont_resp[256];
94 char will_wont_resp[256];
95
96 int
97 eight = 0,
98 autologin = 0, /* Autologin anyone? */
99 skiprc = 0,
100 connected,
101 showoptions,
102 ISend, /* trying to send network data in */
103 debug = 0,
104 crmod,
105 netdata, /* Print out network data flow */
106 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
107 telnetport,
108 SYNCHing, /* we are in TELNET SYNCH mode */
109 flushout, /* flush output */
110 autoflush = 0, /* flush output when interrupting? */
111 autosynch, /* send interrupt characters with SYNCH? */
112 localflow, /* we handle flow control locally */
113 restartany, /* if flow control enabled, restart on any character */
114 localchars, /* we recognize interrupt/quit */
115 donelclchars, /* the user has set "localchars" */
116 donebinarytoggle, /* the user has put us in binary */
117 dontlecho, /* do we suppress local echoing right now? */
118 globalmode,
119 doaddrlookup = 1, /* do a reverse address lookup? */
120 clienteof = 0;
121
122 char *prompt = 0;
123 #ifdef ENCRYPTION
124 char *line; /* hack around breakage in sra.c :-( !! */
125 #endif
126
127 cc_t escape;
128 cc_t rlogin;
129 #ifdef KLUDGELINEMODE
130 cc_t echoc;
131 #endif
132
133 /*
134 * Telnet receiver states for fsm
135 */
136 #define TS_DATA 0
137 #define TS_IAC 1
138 #define TS_WILL 2
139 #define TS_WONT 3
140 #define TS_DO 4
141 #define TS_DONT 5
142 #define TS_CR 6
143 #define TS_SB 7 /* sub-option collection */
144 #define TS_SE 8 /* looking for sub-option end */
145
146 static int telrcv_state;
147 #ifdef OLD_ENVIRON
148 unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
149 #else
150 # define telopt_environ TELOPT_NEW_ENVIRON
151 #endif
152
153 jmp_buf toplevel;
154 jmp_buf peerdied;
155
156 int flushline;
157 int linemode;
158
159 #ifdef KLUDGELINEMODE
160 int kludgelinemode = 1;
161 #endif
162
163 static int is_unique(char *, char **, char **);
164
165 /*
166 * The following are some clocks used to decide how to interpret
167 * the relationship between various variables.
168 */
169
170 Clocks clocks;
171 \f
172 /*
173 * Initialize telnet environment.
174 */
175
176 void
177 init_telnet(void)
178 {
179 env_init();
180
181 SB_CLEAR();
182 ClearArray(options);
183
184 connected = ISend = localflow = donebinarytoggle = 0;
185 #ifdef AUTHENTICATION
186 #ifdef ENCRYPTION
187 auth_encrypt_connect(connected);
188 #endif
189 #endif
190 restartany = -1;
191
192 SYNCHing = 0;
193
194 /* Don't change NetTrace */
195
196 escape = CONTROL(']');
197 rlogin = _POSIX_VDISABLE;
198 #ifdef KLUDGELINEMODE
199 echoc = CONTROL('E');
200 #endif
201
202 flushline = 1;
203 telrcv_state = TS_DATA;
204 }
205 \f
206
207 /*
208 * These routines are in charge of sending option negotiations
209 * to the other side.
210 *
211 * The basic idea is that we send the negotiation if either side
212 * is in disagreement as to what the current state should be.
213 */
214
215 void
216 send_do(int c, int init)
217 {
218 if (init) {
219 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
220 my_want_state_is_do(c))
221 return;
222 set_my_want_state_do(c);
223 do_dont_resp[c]++;
224 }
225 NET2ADD(IAC, DO);
226 NETADD(c);
227 printoption("SENT", DO, c);
228 }
229
230 void
231 send_dont(int c, int init)
232 {
233 if (init) {
234 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
235 my_want_state_is_dont(c))
236 return;
237 set_my_want_state_dont(c);
238 do_dont_resp[c]++;
239 }
240 NET2ADD(IAC, DONT);
241 NETADD(c);
242 printoption("SENT", DONT, c);
243 }
244
245 void
246 send_will(int c, int init)
247 {
248 if (init) {
249 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
250 my_want_state_is_will(c))
251 return;
252 set_my_want_state_will(c);
253 will_wont_resp[c]++;
254 }
255 NET2ADD(IAC, WILL);
256 NETADD(c);
257 printoption("SENT", WILL, c);
258 }
259
260 void
261 send_wont(int c, int init)
262 {
263 if (init) {
264 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
265 my_want_state_is_wont(c))
266 return;
267 set_my_want_state_wont(c);
268 will_wont_resp[c]++;
269 }
270 NET2ADD(IAC, WONT);
271 NETADD(c);
272 printoption("SENT", WONT, c);
273 }
274
275 void
276 willoption(int option)
277 {
278 int new_state_ok = 0;
279
280 if (do_dont_resp[option]) {
281 --do_dont_resp[option];
282 if (do_dont_resp[option] && my_state_is_do(option))
283 --do_dont_resp[option];
284 }
285
286 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
287
288 switch (option) {
289
290 case TELOPT_ECHO:
291 case TELOPT_BINARY:
292 case TELOPT_SGA:
293 settimer(modenegotiated);
294 /* FALL THROUGH */
295 case TELOPT_STATUS:
296 #ifdef AUTHENTICATION
297 case TELOPT_AUTHENTICATION:
298 #endif
299 #ifdef ENCRYPTION
300 case TELOPT_ENCRYPT:
301 #endif /* ENCRYPTION */
302 new_state_ok = 1;
303 break;
304
305 case TELOPT_TM:
306 if (flushout)
307 flushout = 0;
308 /*
309 * Special case for TM. If we get back a WILL,
310 * pretend we got back a WONT.
311 */
312 set_my_want_state_dont(option);
313 set_my_state_dont(option);
314 return; /* Never reply to TM will's/wont's */
315
316 case TELOPT_LINEMODE:
317 default:
318 break;
319 }
320
321 if (new_state_ok) {
322 set_my_want_state_do(option);
323 send_do(option, 0);
324 setconnmode(0); /* possibly set new tty mode */
325 } else {
326 do_dont_resp[option]++;
327 send_dont(option, 0);
328 }
329 }
330 set_my_state_do(option);
331 #ifdef ENCRYPTION
332 if (option == TELOPT_ENCRYPT)
333 encrypt_send_support();
334 #endif /* ENCRYPTION */
335 }
336
337 void
338 wontoption(int option)
339 {
340 if (do_dont_resp[option]) {
341 --do_dont_resp[option];
342 if (do_dont_resp[option] && my_state_is_dont(option))
343 --do_dont_resp[option];
344 }
345
346 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
347
348 switch (option) {
349
350 #ifdef KLUDGELINEMODE
351 case TELOPT_SGA:
352 if (!kludgelinemode)
353 break;
354 /* FALL THROUGH */
355 #endif
356 case TELOPT_ECHO:
357 settimer(modenegotiated);
358 break;
359
360 case TELOPT_TM:
361 if (flushout)
362 flushout = 0;
363 set_my_want_state_dont(option);
364 set_my_state_dont(option);
365 return; /* Never reply to TM will's/wont's */
366
367 default:
368 break;
369 }
370 set_my_want_state_dont(option);
371 if (my_state_is_do(option))
372 send_dont(option, 0);
373 setconnmode(0); /* Set new tty mode */
374 } else if (option == TELOPT_TM) {
375 /*
376 * Special case for TM.
377 */
378 if (flushout)
379 flushout = 0;
380 set_my_want_state_dont(option);
381 }
382 set_my_state_dont(option);
383 }
384
385 static void
386 dooption(int option)
387 {
388 int new_state_ok = 0;
389
390 if (will_wont_resp[option]) {
391 --will_wont_resp[option];
392 if (will_wont_resp[option] && my_state_is_will(option))
393 --will_wont_resp[option];
394 }
395
396 if (will_wont_resp[option] == 0) {
397 if (my_want_state_is_wont(option)) {
398
399 switch (option) {
400
401 case TELOPT_TM:
402 /*
403 * Special case for TM. We send a WILL, but pretend
404 * we sent WONT.
405 */
406 send_will(option, 0);
407 set_my_want_state_wont(TELOPT_TM);
408 set_my_state_wont(TELOPT_TM);
409 return;
410
411 case TELOPT_BINARY: /* binary mode */
412 case TELOPT_NAWS: /* window size */
413 case TELOPT_TSPEED: /* terminal speed */
414 case TELOPT_LFLOW: /* local flow control */
415 case TELOPT_TTYPE: /* terminal type option */
416 case TELOPT_SGA: /* no big deal */
417 #ifdef ENCRYPTION
418 case TELOPT_ENCRYPT: /* encryption variable option */
419 #endif /* ENCRYPTION */
420 new_state_ok = 1;
421 break;
422
423 case TELOPT_NEW_ENVIRON: /* New environment variable option */
424 #ifdef OLD_ENVIRON
425 if (my_state_is_will(TELOPT_OLD_ENVIRON))
426 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */
427 goto env_common;
428 case TELOPT_OLD_ENVIRON: /* Old environment variable option */
429 if (my_state_is_will(TELOPT_NEW_ENVIRON))
430 break; /* Don't enable if new one is in use! */
431 env_common:
432 telopt_environ = option;
433 #endif
434 new_state_ok = 1;
435 break;
436
437 #ifdef AUTHENTICATION
438 case TELOPT_AUTHENTICATION:
439 if (autologin)
440 new_state_ok = 1;
441 break;
442 #endif
443
444 case TELOPT_XDISPLOC: /* X Display location */
445 if (env_getvalue("DISPLAY"))
446 new_state_ok = 1;
447 break;
448
449 case TELOPT_LINEMODE:
450 #ifdef KLUDGELINEMODE
451 kludgelinemode = 0;
452 send_do(TELOPT_SGA, 1);
453 #endif
454 set_my_want_state_will(TELOPT_LINEMODE);
455 send_will(option, 0);
456 set_my_state_will(TELOPT_LINEMODE);
457 slc_init();
458 return;
459
460 case TELOPT_ECHO: /* We're never going to echo... */
461 default:
462 break;
463 }
464
465 if (new_state_ok) {
466 set_my_want_state_will(option);
467 send_will(option, 0);
468 setconnmode(0); /* Set new tty mode */
469 } else {
470 will_wont_resp[option]++;
471 send_wont(option, 0);
472 }
473 } else {
474 /*
475 * Handle options that need more things done after the
476 * other side has acknowledged the option.
477 */
478 switch (option) {
479 case TELOPT_LINEMODE:
480 #ifdef KLUDGELINEMODE
481 kludgelinemode = 0;
482 send_do(TELOPT_SGA, 1);
483 #endif
484 set_my_state_will(option);
485 slc_init();
486 send_do(TELOPT_SGA, 0);
487 return;
488 }
489 }
490 }
491 set_my_state_will(option);
492 }
493
494 static void
495 dontoption(int option)
496 {
497
498 if (will_wont_resp[option]) {
499 --will_wont_resp[option];
500 if (will_wont_resp[option] && my_state_is_wont(option))
501 --will_wont_resp[option];
502 }
503
504 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
505 switch (option) {
506 case TELOPT_LINEMODE:
507 linemode = 0; /* put us back to the default state */
508 break;
509 #ifdef OLD_ENVIRON
510 case TELOPT_NEW_ENVIRON:
511 /*
512 * The new environ option wasn't recognized, try
513 * the old one.
514 */
515 send_will(TELOPT_OLD_ENVIRON, 1);
516 telopt_environ = TELOPT_OLD_ENVIRON;
517 break;
518 #endif
519 }
520 /* we always accept a DONT */
521 set_my_want_state_wont(option);
522 if (my_state_is_will(option))
523 send_wont(option, 0);
524 setconnmode(0); /* Set new tty mode */
525 }
526 set_my_state_wont(option);
527 }
528
529 /*
530 * Given a buffer returned by tgetent(), this routine will turn
531 * the pipe separated list of names in the buffer into an array
532 * of pointers to null terminated names. We toss out any bad,
533 * duplicate, or verbose names (names with spaces).
534 */
535
536 static const char *name_unknown = "UNKNOWN";
537 static const char *unknown[] = { NULL, NULL };
538
539 static const char **
540 mklist(char *buf, char *name)
541 {
542 int n;
543 char c, *cp, **argvp, *cp2, **argv, **avt;
544
545 if (name) {
546 if (strlen(name) > 40) {
547 name = 0;
548 unknown[0] = name_unknown;
549 } else {
550 unknown[0] = name;
551 upcase(name);
552 }
553 } else
554 unknown[0] = name_unknown;
555 /*
556 * Count up the number of names.
557 */
558 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) {
559 if (*cp == '|')
560 n++;
561 }
562 /*
563 * Allocate an array to put the name pointers into
564 */
565 argv = (char **)malloc((n+3)*sizeof(char *));
566 if (argv == 0)
567 return(unknown);
568
569 /*
570 * Fill up the array of pointers to names.
571 */
572 *argv = 0;
573 argvp = argv+1;
574 n = 0;
575 for (cp = cp2 = buf; (c = *cp); cp++) {
576 if (c == '|' || c == ':') {
577 *cp++ = '\0';
578 /*
579 * Skip entries that have spaces or are over 40
580 * characters long. If this is our environment
581 * name, then put it up front. Otherwise, as
582 * long as this is not a duplicate name (case
583 * insensitive) add it to the list.
584 */
585 if (n || (cp - cp2 > 41))
586 ;
587 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
588 *argv = cp2;
589 else if (is_unique(cp2, argv+1, argvp))
590 *argvp++ = cp2;
591 if (c == ':')
592 break;
593 /*
594 * Skip multiple delimiters. Reset cp2 to
595 * the beginning of the next name. Reset n,
596 * the flag for names with spaces.
597 */
598 while ((c = *cp) == '|')
599 cp++;
600 cp2 = cp;
601 n = 0;
602 }
603 /*
604 * Skip entries with spaces or non-ascii values.
605 * Convert lower case letters to upper case.
606 */
607 if ((c == ' ') || !isascii(c))
608 n = 1;
609 else if (islower(c))
610 *cp = toupper(c);
611 }
612
613 /*
614 * Check for an old V6 2 character name. If the second
615 * name points to the beginning of the buffer, and is
616 * only 2 characters long, move it to the end of the array.
617 */
618 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
619 --argvp;
620 for (avt = &argv[1]; avt < argvp; avt++)
621 *avt = *(avt+1);
622 *argvp++ = buf;
623 }
624
625 /*
626 * Duplicate last name, for TTYPE option, and null
627 * terminate the array. If we didn't find a match on
628 * our terminal name, put that name at the beginning.
629 */
630 cp = *(argvp-1);
631 *argvp++ = cp;
632 *argvp = 0;
633
634 if (*argv == 0) {
635 if (name)
636 *argv = name;
637 else {
638 --argvp;
639 for (avt = argv; avt < argvp; avt++)
640 *avt = *(avt+1);
641 }
642 }
643 if (*argv)
644 return((const char **)argv);
645 else
646 return(unknown);
647 }
648
649 static int
650 is_unique(char *name, char **as, char **ae)
651 {
652 char **ap;
653 int n;
654
655 n = strlen(name) + 1;
656 for (ap = as; ap < ae; ap++)
657 if (strncasecmp(*ap, name, n) == 0)
658 return(0);
659 return (1);
660 }
661
662 #ifdef TERMCAP
663 char termbuf[1024];
664
665 /*ARGSUSED*/
666 static int
667 setupterm(char *tname, int fd, int *errp)
668 {
669 if (tgetent(termbuf, tname) == 1) {
670 termbuf[1023] = '\0';
671 if (errp)
672 *errp = 1;
673 return(0);
674 }
675 if (errp)
676 *errp = 0;
677 return(-1);
678 }
679 #else
680 #define termbuf ttytype
681 extern char ttytype[];
682 #endif
683
684 int resettermname = 1;
685
686 static const char *
687 gettermname(void)
688 {
689 char *tname;
690 static const char **tnamep = 0;
691 static const char **next;
692 int err;
693
694 if (resettermname) {
695 resettermname = 0;
696 if (tnamep && tnamep != unknown)
697 free(tnamep);
698 if ((tname = env_getvalue("TERM")) &&
699 (setupterm(tname, 1, &err) == 0)) {
700 tnamep = mklist(termbuf, tname);
701 } else {
702 if (tname && (strlen(tname) <= 40)) {
703 unknown[0] = tname;
704 upcase(tname);
705 } else
706 unknown[0] = name_unknown;
707 tnamep = unknown;
708 }
709 next = tnamep;
710 }
711 if (*next == 0)
712 next = tnamep;
713 return(*next++);
714 }
715 /*
716 * suboption()
717 *
718 * Look at the sub-option buffer, and try to be helpful to the other
719 * side.
720 *
721 * Currently we recognize:
722 *
723 * Terminal type, send request.
724 * Terminal speed (send request).
725 * Local flow control (is request).
726 * Linemode
727 */
728
729 static void
730 suboption(void)
731 {
732 unsigned char subchar;
733
734 printsub('<', subbuffer, SB_LEN()+2);
735 switch (subchar = SB_GET()) {
736 case TELOPT_TTYPE:
737 if (my_want_state_is_wont(TELOPT_TTYPE))
738 return;
739 if (SB_EOF() || SB_GET() != TELQUAL_SEND) {
740 return;
741 } else {
742 const char *name;
743 unsigned char temp[50];
744 int len;
745
746 name = gettermname();
747 len = strlen(name) + 4 + 2;
748 if (len < NETROOM()) {
749 sprintf(temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
750 TELQUAL_IS, name, IAC, SE);
751 ring_supply_data(&netoring, temp, len);
752 printsub('>', &temp[2], len-2);
753 } else {
754 ExitString("No room in buffer for terminal type.\n", 1);
755 /*NOTREACHED*/
756 }
757 }
758 break;
759 case TELOPT_TSPEED:
760 if (my_want_state_is_wont(TELOPT_TSPEED))
761 return;
762 if (SB_EOF())
763 return;
764 if (SB_GET() == TELQUAL_SEND) {
765 long ospeed, ispeed;
766 unsigned char temp[50];
767 int len;
768
769 TerminalSpeeds(&ispeed, &ospeed);
770
771 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED,
772 TELQUAL_IS, ospeed, ispeed, IAC, SE);
773 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
774
775 if (len < NETROOM()) {
776 ring_supply_data(&netoring, temp, len);
777 printsub('>', temp+2, len - 2);
778 }
779 /*@*/ else printf("lm_will: not enough room in buffer\n");
780 }
781 break;
782 case TELOPT_LFLOW:
783 if (my_want_state_is_wont(TELOPT_LFLOW))
784 return;
785 if (SB_EOF())
786 return;
787 switch(SB_GET()) {
788 case LFLOW_RESTART_ANY:
789 restartany = 1;
790 break;
791 case LFLOW_RESTART_XON:
792 restartany = 0;
793 break;
794 case LFLOW_ON:
795 localflow = 1;
796 break;
797 case LFLOW_OFF:
798 localflow = 0;
799 break;
800 default:
801 return;
802 }
803 setcommandmode();
804 setconnmode(0);
805 break;
806
807 case TELOPT_LINEMODE:
808 if (my_want_state_is_wont(TELOPT_LINEMODE))
809 return;
810 if (SB_EOF())
811 return;
812 switch (SB_GET()) {
813 case WILL:
814 lm_will(subpointer, SB_LEN());
815 break;
816 case WONT:
817 lm_wont(subpointer, SB_LEN());
818 break;
819 case DO:
820 lm_do(subpointer, SB_LEN());
821 break;
822 case DONT:
823 lm_dont(subpointer, SB_LEN());
824 break;
825 case LM_SLC:
826 slc(subpointer, SB_LEN());
827 break;
828 case LM_MODE:
829 lm_mode(subpointer, SB_LEN(), 0);
830 break;
831 default:
832 break;
833 }
834 break;
835
836 #ifdef OLD_ENVIRON
837 case TELOPT_OLD_ENVIRON:
838 #endif
839 case TELOPT_NEW_ENVIRON:
840 if (SB_EOF())
841 return;
842 switch(SB_PEEK()) {
843 case TELQUAL_IS:
844 case TELQUAL_INFO:
845 if (my_want_state_is_dont(subchar))
846 return;
847 break;
848 case TELQUAL_SEND:
849 if (my_want_state_is_wont(subchar)) {
850 return;
851 }
852 break;
853 default:
854 return;
855 }
856 env_opt(subpointer, SB_LEN());
857 break;
858
859 case TELOPT_XDISPLOC:
860 if (my_want_state_is_wont(TELOPT_XDISPLOC))
861 return;
862 if (SB_EOF())
863 return;
864 if (SB_GET() == TELQUAL_SEND) {
865 unsigned char temp[50], *dp;
866 int len;
867
868 if ((dp = env_getvalue("DISPLAY")) == NULL ||
869 strlen(dp) > sizeof(temp) - 7) {
870 /*
871 * Something happened, we no longer have a DISPLAY
872 * variable. Or it is too long. So, turn off the option.
873 */
874 send_wont(TELOPT_XDISPLOC, 1);
875 break;
876 }
877 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB,
878 TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE);
879 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
880
881 if (len < NETROOM()) {
882 ring_supply_data(&netoring, temp, len);
883 printsub('>', temp+2, len - 2);
884 }
885 /*@*/ else printf("lm_will: not enough room in buffer\n");
886 }
887 break;
888
889 #ifdef AUTHENTICATION
890 case TELOPT_AUTHENTICATION: {
891 if (!autologin)
892 break;
893 if (SB_EOF())
894 return;
895 switch(SB_GET()) {
896 case TELQUAL_IS:
897 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
898 return;
899 auth_is(subpointer, SB_LEN());
900 break;
901 case TELQUAL_SEND:
902 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
903 return;
904 auth_send(subpointer, SB_LEN());
905 break;
906 case TELQUAL_REPLY:
907 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
908 return;
909 auth_reply(subpointer, SB_LEN());
910 break;
911 case TELQUAL_NAME:
912 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
913 return;
914 auth_name(subpointer, SB_LEN());
915 break;
916 }
917 }
918 break;
919 #endif
920 #ifdef ENCRYPTION
921 case TELOPT_ENCRYPT:
922 if (SB_EOF())
923 return;
924 switch(SB_GET()) {
925 case ENCRYPT_START:
926 if (my_want_state_is_dont(TELOPT_ENCRYPT))
927 return;
928 encrypt_start(subpointer, SB_LEN());
929 break;
930 case ENCRYPT_END:
931 if (my_want_state_is_dont(TELOPT_ENCRYPT))
932 return;
933 encrypt_end();
934 break;
935 case ENCRYPT_SUPPORT:
936 if (my_want_state_is_wont(TELOPT_ENCRYPT))
937 return;
938 encrypt_support(subpointer, SB_LEN());
939 break;
940 case ENCRYPT_REQSTART:
941 if (my_want_state_is_wont(TELOPT_ENCRYPT))
942 return;
943 encrypt_request_start(subpointer, SB_LEN());
944 break;
945 case ENCRYPT_REQEND:
946 if (my_want_state_is_wont(TELOPT_ENCRYPT))
947 return;
948 /*
949 * We can always send an REQEND so that we cannot
950 * get stuck encrypting. We should only get this
951 * if we have been able to get in the correct mode
952 * anyhow.
953 */
954 encrypt_request_end();
955 break;
956 case ENCRYPT_IS:
957 if (my_want_state_is_dont(TELOPT_ENCRYPT))
958 return;
959 encrypt_is(subpointer, SB_LEN());
960 break;
961 case ENCRYPT_REPLY:
962 if (my_want_state_is_wont(TELOPT_ENCRYPT))
963 return;
964 encrypt_reply(subpointer, SB_LEN());
965 break;
966 case ENCRYPT_ENC_KEYID:
967 if (my_want_state_is_dont(TELOPT_ENCRYPT))
968 return;
969 encrypt_enc_keyid(subpointer, SB_LEN());
970 break;
971 case ENCRYPT_DEC_KEYID:
972 if (my_want_state_is_wont(TELOPT_ENCRYPT))
973 return;
974 encrypt_dec_keyid(subpointer, SB_LEN());
975 break;
976 default:
977 break;
978 }
979 break;
980 #endif /* ENCRYPTION */
981 default:
982 break;
983 }
984 }
985
986 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
987
988 void
989 lm_will(unsigned char *cmd, int len)
990 {
991 if (len < 1) {
992 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */
993 return;
994 }
995 switch(cmd[0]) {
996 case LM_FORWARDMASK: /* We shouldn't ever get this... */
997 default:
998 str_lm[3] = DONT;
999 str_lm[4] = cmd[0];
1000 if (NETROOM() > (int)sizeof(str_lm)) {
1001 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1002 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1003 }
1004 /*@*/ else printf("lm_will: not enough room in buffer\n");
1005 break;
1006 }
1007 }
1008
1009 void
1010 lm_wont(unsigned char *cmd, int len)
1011 {
1012 if (len < 1) {
1013 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */
1014 return;
1015 }
1016 switch(cmd[0]) {
1017 case LM_FORWARDMASK: /* We shouldn't ever get this... */
1018 default:
1019 /* We are always DONT, so don't respond */
1020 return;
1021 }
1022 }
1023
1024 void
1025 lm_do(unsigned char *cmd, int len)
1026 {
1027 if (len < 1) {
1028 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */
1029 return;
1030 }
1031 switch(cmd[0]) {
1032 case LM_FORWARDMASK:
1033 default:
1034 str_lm[3] = WONT;
1035 str_lm[4] = cmd[0];
1036 if (NETROOM() > (int)sizeof(str_lm)) {
1037 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1038 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1039 }
1040 /*@*/ else printf("lm_do: not enough room in buffer\n");
1041 break;
1042 }
1043 }
1044
1045 void
1046 lm_dont(unsigned char *cmd, int len)
1047 {
1048 if (len < 1) {
1049 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */
1050 return;
1051 }
1052 switch(cmd[0]) {
1053 case LM_FORWARDMASK:
1054 default:
1055 /* we are always WONT, so don't respond */
1056 break;
1057 }
1058 }
1059
1060 static unsigned char str_lm_mode[] = {
1061 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE
1062 };
1063
1064 void
1065 lm_mode(unsigned char *cmd, int len, int init)
1066 {
1067 if (len != 1)
1068 return;
1069 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd)
1070 return;
1071 if (*cmd&MODE_ACK)
1072 return;
1073 linemode = *cmd&(MODE_MASK&~MODE_ACK);
1074 str_lm_mode[4] = linemode;
1075 if (!init)
1076 str_lm_mode[4] |= MODE_ACK;
1077 if (NETROOM() > (int)sizeof(str_lm_mode)) {
1078 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode));
1079 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2);
1080 }
1081 /*@*/ else printf("lm_mode: not enough room in buffer\n");
1082 setconnmode(0); /* set changed mode */
1083 }
1084
1085 \f
1086
1087 /*
1088 * slc()
1089 * Handle special character suboption of LINEMODE.
1090 */
1091
1092 struct spc {
1093 cc_t val;
1094 cc_t *valp;
1095 char flags; /* Current flags & level */
1096 char mylevel; /* Maximum level & flags */
1097 } spc_data[NSLC+1];
1098
1099 #define SLC_IMPORT 0
1100 #define SLC_EXPORT 1
1101 #define SLC_RVALUE 2
1102 static int slc_mode = SLC_EXPORT;
1103
1104 void
1105 slc_init(void)
1106 {
1107 struct spc *spcp;
1108
1109 localchars = 1;
1110 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
1111 spcp->val = 0;
1112 spcp->valp = 0;
1113 spcp->flags = spcp->mylevel = SLC_NOSUPPORT;
1114 }
1115
1116 #define initfunc(func, flags) { \
1117 spcp = &spc_data[func]; \
1118 if ((spcp->valp = tcval(func))) { \
1119 spcp->val = *spcp->valp; \
1120 spcp->mylevel = SLC_VARIABLE|flags; \
1121 } else { \
1122 spcp->val = 0; \
1123 spcp->mylevel = SLC_DEFAULT; \
1124 } \
1125 }
1126
1127 initfunc(SLC_SYNCH, 0);
1128 /* No BRK */
1129 initfunc(SLC_AO, 0);
1130 initfunc(SLC_AYT, 0);
1131 /* No EOR */
1132 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT);
1133 initfunc(SLC_EOF, 0);
1134 #ifndef SYSV_TERMIO
1135 initfunc(SLC_SUSP, SLC_FLUSHIN);
1136 #endif
1137 initfunc(SLC_EC, 0);
1138 initfunc(SLC_EL, 0);
1139 #ifndef SYSV_TERMIO
1140 initfunc(SLC_EW, 0);
1141 initfunc(SLC_RP, 0);
1142 initfunc(SLC_LNEXT, 0);
1143 #endif
1144 initfunc(SLC_XON, 0);
1145 initfunc(SLC_XOFF, 0);
1146 #ifdef SYSV_TERMIO
1147 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE;
1148 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE;
1149 #endif
1150 initfunc(SLC_FORW1, 0);
1151 #ifdef USE_TERMIO
1152 initfunc(SLC_FORW2, 0);
1153 /* No FORW2 */
1154 #endif
1155
1156 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT);
1157 #undef initfunc
1158
1159 if (slc_mode == SLC_EXPORT)
1160 slc_export();
1161 else
1162 slc_import(1);
1163
1164 }
1165
1166 void
1167 slcstate(void)
1168 {
1169 printf("Special characters are %s values\n",
1170 slc_mode == SLC_IMPORT ? "remote default" :
1171 slc_mode == SLC_EXPORT ? "local" :
1172 "remote");
1173 }
1174
1175 void
1176 slc_mode_export(void)
1177 {
1178 slc_mode = SLC_EXPORT;
1179 if (my_state_is_will(TELOPT_LINEMODE))
1180 slc_export();
1181 }
1182
1183 void
1184 slc_mode_import(int def)
1185 {
1186 slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
1187 if (my_state_is_will(TELOPT_LINEMODE))
1188 slc_import(def);
1189 }
1190
1191 unsigned char slc_import_val[] = {
1192 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
1193 };
1194 unsigned char slc_import_def[] = {
1195 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
1196 };
1197
1198 void
1199 slc_import(int def)
1200 {
1201 if (NETROOM() > (int)sizeof(slc_import_val)) {
1202 if (def) {
1203 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def));
1204 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2);
1205 } else {
1206 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val));
1207 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2);
1208 }
1209 }
1210 /*@*/ else printf("slc_import: not enough room\n");
1211 }
1212
1213 void
1214 slc_export(void)
1215 {
1216 struct spc *spcp;
1217
1218 TerminalDefaultChars();
1219
1220 slc_start_reply();
1221 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1222 if (spcp->mylevel != SLC_NOSUPPORT) {
1223 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1224 spcp->flags = SLC_NOSUPPORT;
1225 else
1226 spcp->flags = spcp->mylevel;
1227 if (spcp->valp)
1228 spcp->val = *spcp->valp;
1229 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1230 }
1231 }
1232 slc_end_reply();
1233 (void)slc_update();
1234 setconnmode(1); /* Make sure the character values are set */
1235 }
1236
1237 void
1238 slc(unsigned char *cp, int len)
1239 {
1240 struct spc *spcp;
1241 int func,level;
1242
1243 slc_start_reply();
1244
1245 for (; len >= 3; len -=3, cp +=3) {
1246
1247 func = cp[SLC_FUNC];
1248
1249 if (func == 0) {
1250 /*
1251 * Client side: always ignore 0 function.
1252 */
1253 continue;
1254 }
1255 if (func > NSLC) {
1256 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT)
1257 slc_add_reply(func, SLC_NOSUPPORT, 0);
1258 continue;
1259 }
1260
1261 spcp = &spc_data[func];
1262
1263 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK);
1264
1265 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) &&
1266 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) {
1267 continue;
1268 }
1269
1270 if (level == (SLC_DEFAULT|SLC_ACK)) {
1271 /*
1272 * This is an error condition, the SLC_ACK
1273 * bit should never be set for the SLC_DEFAULT
1274 * level. Our best guess to recover is to
1275 * ignore the SLC_ACK bit.
1276 */
1277 cp[SLC_FLAGS] &= ~SLC_ACK;
1278 }
1279
1280 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) {
1281 spcp->val = (cc_t)cp[SLC_VALUE];
1282 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */
1283 continue;
1284 }
1285
1286 level &= ~SLC_ACK;
1287
1288 if (level <= (spcp->mylevel&SLC_LEVELBITS)) {
1289 spcp->flags = cp[SLC_FLAGS]|SLC_ACK;
1290 spcp->val = (cc_t)cp[SLC_VALUE];
1291 }
1292 if (level == SLC_DEFAULT) {
1293 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT)
1294 spcp->flags = spcp->mylevel;
1295 else
1296 spcp->flags = SLC_NOSUPPORT;
1297 }
1298 slc_add_reply(func, spcp->flags, spcp->val);
1299 }
1300 slc_end_reply();
1301 if (slc_update())
1302 setconnmode(1); /* set the new character values */
1303 }
1304
1305 void
1306 slc_check(void)
1307 {
1308 struct spc *spcp;
1309
1310 slc_start_reply();
1311 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1312 if (spcp->valp && spcp->val != *spcp->valp) {
1313 spcp->val = *spcp->valp;
1314 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1315 spcp->flags = SLC_NOSUPPORT;
1316 else
1317 spcp->flags = spcp->mylevel;
1318 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1319 }
1320 }
1321 slc_end_reply();
1322 setconnmode(1);
1323 }
1324
1325 unsigned char slc_reply[128];
1326 unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
1327 unsigned char *slc_replyp;
1328
1329 void
1330 slc_start_reply(void)
1331 {
1332 slc_replyp = slc_reply;
1333 *slc_replyp++ = IAC;
1334 *slc_replyp++ = SB;
1335 *slc_replyp++ = TELOPT_LINEMODE;
1336 *slc_replyp++ = LM_SLC;
1337 }
1338
1339 void
1340 slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
1341 {
1342 /* A sequence of up to 6 bytes my be written for this member of the SLC
1343 * suboption list by this function. The end of negotiation command,
1344 * which is written by slc_end_reply(), will require 2 additional
1345 * bytes. Do not proceed unless there is sufficient space for these
1346 * items.
1347 */
1348 if (&slc_replyp[6+2] > slc_reply_eom)
1349 return;
1350 if ((*slc_replyp++ = func) == IAC)
1351 *slc_replyp++ = IAC;
1352 if ((*slc_replyp++ = flags) == IAC)
1353 *slc_replyp++ = IAC;
1354 if ((*slc_replyp++ = (unsigned char)value) == IAC)
1355 *slc_replyp++ = IAC;
1356 }
1357
1358 void
1359 slc_end_reply(void)
1360 {
1361 int len;
1362
1363 *slc_replyp++ = IAC;
1364 *slc_replyp++ = SE;
1365 len = slc_replyp - slc_reply;
1366 if (len <= 6)
1367 return;
1368 if (NETROOM() > len) {
1369 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply);
1370 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2);
1371 }
1372 /*@*/else printf("slc_end_reply: not enough room\n");
1373 }
1374
1375 int
1376 slc_update(void)
1377 {
1378 struct spc *spcp;
1379 int need_update = 0;
1380
1381 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1382 if (!(spcp->flags&SLC_ACK))
1383 continue;
1384 spcp->flags &= ~SLC_ACK;
1385 if (spcp->valp && (*spcp->valp != spcp->val)) {
1386 *spcp->valp = spcp->val;
1387 need_update = 1;
1388 }
1389 }
1390 return(need_update);
1391 }
1392
1393 #ifdef OLD_ENVIRON
1394 # ifdef ENV_HACK
1395 /*
1396 * Earlier version of telnet/telnetd from the BSD code had
1397 * the definitions of VALUE and VAR reversed. To ensure
1398 * maximum interoperability, we assume that the server is
1399 * an older BSD server, until proven otherwise. The newer
1400 * BSD servers should be able to handle either definition,
1401 * so it is better to use the wrong values if we don't
1402 * know what type of server it is.
1403 */
1404 int env_auto = 1;
1405 int old_env_var = OLD_ENV_VAR;
1406 int old_env_value = OLD_ENV_VALUE;
1407 # else
1408 # define old_env_var OLD_ENV_VAR
1409 # define old_env_value OLD_ENV_VALUE
1410 # endif
1411 #endif
1412
1413 void
1414 env_opt(unsigned char *buf, int len)
1415 {
1416 unsigned char *ep = 0, *epc = 0;
1417 int i;
1418
1419 switch(buf[0]&0xff) {
1420 case TELQUAL_SEND:
1421 env_opt_start();
1422 if (len == 1) {
1423 env_opt_add(NULL);
1424 } else for (i = 1; i < len; i++) {
1425 switch (buf[i]&0xff) {
1426 #ifdef OLD_ENVIRON
1427 case OLD_ENV_VAR:
1428 # ifdef ENV_HACK
1429 if (telopt_environ == TELOPT_OLD_ENVIRON
1430 && env_auto) {
1431 /* Server has the same definitions */
1432 old_env_var = OLD_ENV_VAR;
1433 old_env_value = OLD_ENV_VALUE;
1434 }
1435 /* FALL THROUGH */
1436 # endif
1437 case OLD_ENV_VALUE:
1438 /*
1439 * Although OLD_ENV_VALUE is not legal, we will
1440 * still recognize it, just in case it is an
1441 * old server that has VAR & VALUE mixed up...
1442 */
1443 /* FALL THROUGH */
1444 #else
1445 case NEW_ENV_VAR:
1446 #endif
1447 case ENV_USERVAR:
1448 if (ep) {
1449 *epc = 0;
1450 env_opt_add(ep);
1451 }
1452 ep = epc = &buf[i+1];
1453 break;
1454 case ENV_ESC:
1455 i++;
1456 /*FALL THROUGH*/
1457 default:
1458 if (epc)
1459 *epc++ = buf[i];
1460 break;
1461 }
1462 }
1463 if (ep) {
1464 *epc = 0;
1465 env_opt_add(ep);
1466 }
1467 env_opt_end(1);
1468 break;
1469
1470 case TELQUAL_IS:
1471 case TELQUAL_INFO:
1472 /* Ignore for now. We shouldn't get it anyway. */
1473 break;
1474
1475 default:
1476 break;
1477 }
1478 }
1479
1480 #define OPT_REPLY_SIZE 256
1481 unsigned char *opt_reply;
1482 unsigned char *opt_replyp;
1483 unsigned char *opt_replyend;
1484
1485 void
1486 env_opt_start(void)
1487 {
1488 if (opt_reply)
1489 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE);
1490 else
1491 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE);
1492 if (opt_reply == NULL) {
1493 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n");
1494 opt_reply = opt_replyp = opt_replyend = NULL;
1495 return;
1496 }
1497 opt_replyp = opt_reply;
1498 opt_replyend = opt_reply + OPT_REPLY_SIZE;
1499 *opt_replyp++ = IAC;
1500 *opt_replyp++ = SB;
1501 *opt_replyp++ = telopt_environ;
1502 *opt_replyp++ = TELQUAL_IS;
1503 }
1504
1505 void
1506 env_opt_start_info(void)
1507 {
1508 env_opt_start();
1509 if (opt_replyp)
1510 opt_replyp[-1] = TELQUAL_INFO;
1511 }
1512
1513 void
1514 env_opt_add(unsigned char *ep)
1515 {
1516 unsigned char *vp, c;
1517
1518 if (opt_reply == NULL) /*XXX*/
1519 return; /*XXX*/
1520
1521 if (ep == NULL || *ep == '\0') {
1522 /* Send user defined variables first. */
1523 env_default(1, 0);
1524 while ((ep = env_default(0, 0)))
1525 env_opt_add(ep);
1526
1527 /* Now add the list of well know variables. */
1528 env_default(1, 1);
1529 while ((ep = env_default(0, 1)))
1530 env_opt_add(ep);
1531 return;
1532 }
1533 vp = env_getvalue(ep);
1534 if (opt_replyp + 2*(vp ? strlen((char *)vp) : 0) +
1535 2*strlen((char *)ep) + 6 > opt_replyend)
1536 {
1537 int len;
1538 opt_replyend += OPT_REPLY_SIZE + 2*strlen((char *)ep) + 2*(vp ? strlen((char *)vp) : 0);
1539 len = opt_replyend - opt_reply;
1540 opt_reply = (unsigned char *)realloc(opt_reply, len);
1541 if (opt_reply == NULL) {
1542 /*@*/ printf("env_opt_add: realloc() failed!!!\n");
1543 opt_reply = opt_replyp = opt_replyend = NULL;
1544 return;
1545 }
1546 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp);
1547 opt_replyend = opt_reply + len;
1548 }
1549 if (opt_welldefined(ep))
1550 #ifdef OLD_ENVIRON
1551 if (telopt_environ == TELOPT_OLD_ENVIRON)
1552 *opt_replyp++ = old_env_var;
1553 else
1554 #endif
1555 *opt_replyp++ = NEW_ENV_VAR;
1556 else
1557 *opt_replyp++ = ENV_USERVAR;
1558 for (;;) {
1559 while ((c = *ep++)) {
1560 switch(c&0xff) {
1561 case IAC:
1562 *opt_replyp++ = IAC;
1563 break;
1564 case NEW_ENV_VAR:
1565 case NEW_ENV_VALUE:
1566 case ENV_ESC:
1567 case ENV_USERVAR:
1568 *opt_replyp++ = ENV_ESC;
1569 break;
1570 }
1571 *opt_replyp++ = c;
1572 }
1573 if ((ep = vp)) {
1574 #ifdef OLD_ENVIRON
1575 if (telopt_environ == TELOPT_OLD_ENVIRON)
1576 *opt_replyp++ = old_env_value;
1577 else
1578 #endif
1579 *opt_replyp++ = NEW_ENV_VALUE;
1580 vp = NULL;
1581 } else
1582 break;
1583 }
1584 }
1585
1586 int
1587 opt_welldefined(const char *ep)
1588 {
1589 if ((strcmp(ep, "USER") == 0) ||
1590 (strcmp(ep, "DISPLAY") == 0) ||
1591 (strcmp(ep, "PRINTER") == 0) ||
1592 (strcmp(ep, "SYSTEMTYPE") == 0) ||
1593 (strcmp(ep, "JOB") == 0) ||
1594 (strcmp(ep, "ACCT") == 0))
1595 return(1);
1596 return(0);
1597 }
1598
1599 void
1600 env_opt_end(int emptyok)
1601 {
1602 int len;
1603
1604 len = opt_replyp - opt_reply + 2;
1605 if (emptyok || len > 6) {
1606 *opt_replyp++ = IAC;
1607 *opt_replyp++ = SE;
1608 if (NETROOM() > len) {
1609 ring_supply_data(&netoring, opt_reply, len);
1610 printsub('>', &opt_reply[2], len - 2);
1611 }
1612 /*@*/ else printf("slc_end_reply: not enough room\n");
1613 }
1614 if (opt_reply) {
1615 free(opt_reply);
1616 opt_reply = opt_replyp = opt_replyend = NULL;
1617 }
1618 }
1619
1620 \f
1621
1622 int
1623 telrcv(void)
1624 {
1625 int c;
1626 int scc;
1627 unsigned char *sbp;
1628 int count;
1629 int returnValue = 0;
1630
1631 scc = 0;
1632 count = 0;
1633 while (TTYROOM() > 2) {
1634 if (scc == 0) {
1635 if (count) {
1636 ring_consumed(&netiring, count);
1637 returnValue = 1;
1638 count = 0;
1639 }
1640 sbp = netiring.consume;
1641 scc = ring_full_consecutive(&netiring);
1642 if (scc == 0) {
1643 /* No more data coming in */
1644 break;
1645 }
1646 }
1647
1648 c = *sbp++ & 0xff, scc--; count++;
1649 #ifdef ENCRYPTION
1650 if (decrypt_input)
1651 c = (*decrypt_input)(c);
1652 #endif /* ENCRYPTION */
1653
1654 switch (telrcv_state) {
1655
1656 case TS_CR:
1657 telrcv_state = TS_DATA;
1658 if (c == '\0') {
1659 break; /* Ignore \0 after CR */
1660 }
1661 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) {
1662 TTYADD(c);
1663 break;
1664 }
1665 /* Else, fall through */
1666
1667 case TS_DATA:
1668 if (c == IAC) {
1669 telrcv_state = TS_IAC;
1670 break;
1671 }
1672 /*
1673 * The 'crmod' hack (see following) is needed
1674 * since we can't * set CRMOD on output only.
1675 * Machines like MULTICS like to send \r without
1676 * \n; since we must turn off CRMOD to get proper
1677 * input, the mapping is done here (sigh).
1678 */
1679 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) {
1680 if (scc > 0) {
1681 c = *sbp&0xff;
1682 #ifdef ENCRYPTION
1683 if (decrypt_input)
1684 c = (*decrypt_input)(c);
1685 #endif /* ENCRYPTION */
1686 if (c == 0) {
1687 sbp++, scc--; count++;
1688 /* a "true" CR */
1689 TTYADD('\r');
1690 } else if (my_want_state_is_dont(TELOPT_ECHO) &&
1691 (c == '\n')) {
1692 sbp++, scc--; count++;
1693 TTYADD('\n');
1694 } else {
1695 #ifdef ENCRYPTION
1696 if (decrypt_input)
1697 (*decrypt_input)(-1);
1698 #endif /* ENCRYPTION */
1699
1700 TTYADD('\r');
1701 if (crmod) {
1702 TTYADD('\n');
1703 }
1704 }
1705 } else {
1706 telrcv_state = TS_CR;
1707 TTYADD('\r');
1708 if (crmod) {
1709 TTYADD('\n');
1710 }
1711 }
1712 } else {
1713 TTYADD(c);
1714 }
1715 continue;
1716
1717 case TS_IAC:
1718 process_iac:
1719 switch (c) {
1720
1721 case WILL:
1722 telrcv_state = TS_WILL;
1723 continue;
1724
1725 case WONT:
1726 telrcv_state = TS_WONT;
1727 continue;
1728
1729 case DO:
1730 telrcv_state = TS_DO;
1731 continue;
1732
1733 case DONT:
1734 telrcv_state = TS_DONT;
1735 continue;
1736
1737 case DM:
1738 /*
1739 * We may have missed an urgent notification,
1740 * so make sure we flush whatever is in the
1741 * buffer currently.
1742 */
1743 printoption("RCVD", IAC, DM);
1744 SYNCHing = 1;
1745 (void) ttyflush(1);
1746 SYNCHing = stilloob();
1747 settimer(gotDM);
1748 break;
1749
1750 case SB:
1751 SB_CLEAR();
1752 telrcv_state = TS_SB;
1753 continue;
1754
1755 case IAC:
1756 TTYADD(IAC);
1757 break;
1758
1759 case NOP:
1760 case GA:
1761 default:
1762 printoption("RCVD", IAC, c);
1763 break;
1764 }
1765 telrcv_state = TS_DATA;
1766 continue;
1767
1768 case TS_WILL:
1769 printoption("RCVD", WILL, c);
1770 willoption(c);
1771 telrcv_state = TS_DATA;
1772 continue;
1773
1774 case TS_WONT:
1775 printoption("RCVD", WONT, c);
1776 wontoption(c);
1777 telrcv_state = TS_DATA;
1778 continue;
1779
1780 case TS_DO:
1781 printoption("RCVD", DO, c);
1782 dooption(c);
1783 if (c == TELOPT_NAWS) {
1784 sendnaws();
1785 } else if (c == TELOPT_LFLOW) {
1786 localflow = 1;
1787 setcommandmode();
1788 setconnmode(0);
1789 }
1790 telrcv_state = TS_DATA;
1791 continue;
1792
1793 case TS_DONT:
1794 printoption("RCVD", DONT, c);
1795 dontoption(c);
1796 flushline = 1;
1797 setconnmode(0); /* set new tty mode (maybe) */
1798 telrcv_state = TS_DATA;
1799 continue;
1800
1801 case TS_SB:
1802 if (c == IAC) {
1803 telrcv_state = TS_SE;
1804 } else {
1805 SB_ACCUM(c);
1806 }
1807 continue;
1808
1809 case TS_SE:
1810 if (c != SE) {
1811 if (c != IAC) {
1812 /*
1813 * This is an error. We only expect to get
1814 * "IAC IAC" or "IAC SE". Several things may
1815 * have happend. An IAC was not doubled, the
1816 * IAC SE was left off, or another option got
1817 * inserted into the suboption are all possibilities.
1818 * If we assume that the IAC was not doubled,
1819 * and really the IAC SE was left off, we could
1820 * get into an infinate loop here. So, instead,
1821 * we terminate the suboption, and process the
1822 * partial suboption if we can.
1823 */
1824 SB_ACCUM(IAC);
1825 SB_ACCUM(c);
1826 subpointer -= 2;
1827 SB_TERM();
1828
1829 printoption("In SUBOPTION processing, RCVD", IAC, c);
1830 suboption(); /* handle sub-option */
1831 telrcv_state = TS_IAC;
1832 goto process_iac;
1833 }
1834 SB_ACCUM(c);
1835 telrcv_state = TS_SB;
1836 } else {
1837 SB_ACCUM(IAC);
1838 SB_ACCUM(SE);
1839 subpointer -= 2;
1840 SB_TERM();
1841 suboption(); /* handle sub-option */
1842 telrcv_state = TS_DATA;
1843 }
1844 }
1845 }
1846 if (count)
1847 ring_consumed(&netiring, count);
1848 return returnValue||count;
1849 }
1850
1851 static int bol = 1, local = 0;
1852
1853 int
1854 rlogin_susp(void)
1855 {
1856 if (local) {
1857 local = 0;
1858 bol = 1;
1859 command(0, "z\n", 2);
1860 return(1);
1861 }
1862 return(0);
1863 }
1864
1865 static int
1866 telsnd(void)
1867 {
1868 int tcc;
1869 int count;
1870 int returnValue = 0;
1871 unsigned char *tbp;
1872
1873 tcc = 0;
1874 count = 0;
1875 while (NETROOM() > 2) {
1876 int sc;
1877 int c;
1878
1879 if (tcc == 0) {
1880 if (count) {
1881 ring_consumed(&ttyiring, count);
1882 returnValue = 1;
1883 count = 0;
1884 }
1885 tbp = ttyiring.consume;
1886 tcc = ring_full_consecutive(&ttyiring);
1887 if (tcc == 0) {
1888 break;
1889 }
1890 }
1891 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
1892 if (rlogin != _POSIX_VDISABLE) {
1893 if (bol) {
1894 bol = 0;
1895 if (sc == rlogin) {
1896 local = 1;
1897 continue;
1898 }
1899 } else if (local) {
1900 local = 0;
1901 if (sc == '.' || c == termEofChar) {
1902 bol = 1;
1903 command(0, "close\n", 6);
1904 continue;
1905 }
1906 if (sc == termSuspChar) {
1907 bol = 1;
1908 command(0, "z\n", 2);
1909 continue;
1910 }
1911 if (sc == escape) {
1912 command(0, tbp, tcc);
1913 bol = 1;
1914 count += tcc;
1915 tcc = 0;
1916 flushline = 1;
1917 break;
1918 }
1919 if (sc != rlogin) {
1920 ++tcc;
1921 --tbp;
1922 --count;
1923 c = sc = rlogin;
1924 }
1925 }
1926 if ((sc == '\n') || (sc == '\r'))
1927 bol = 1;
1928 } else if (escape != _POSIX_VDISABLE && sc == escape) {
1929 /*
1930 * Double escape is a pass through of a single escape character.
1931 */
1932 if (tcc && strip(*tbp) == escape) {
1933 tbp++;
1934 tcc--;
1935 count++;
1936 bol = 0;
1937 } else {
1938 command(0, (char *)tbp, tcc);
1939 bol = 1;
1940 count += tcc;
1941 tcc = 0;
1942 flushline = 1;
1943 break;
1944 }
1945 } else
1946 bol = 0;
1947 #ifdef KLUDGELINEMODE
1948 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
1949 if (tcc > 0 && strip(*tbp) == echoc) {
1950 tcc--; tbp++; count++;
1951 } else {
1952 dontlecho = !dontlecho;
1953 settimer(echotoggle);
1954 setconnmode(0);
1955 flushline = 1;
1956 break;
1957 }
1958 }
1959 #endif
1960 if (MODE_LOCAL_CHARS(globalmode)) {
1961 if (TerminalSpecialChars(sc) == 0) {
1962 bol = 1;
1963 break;
1964 }
1965 }
1966 if (my_want_state_is_wont(TELOPT_BINARY)) {
1967 switch (c) {
1968 case '\n':
1969 /*
1970 * If we are in CRMOD mode (\r ==> \n)
1971 * on our local machine, then probably
1972 * a newline (unix) is CRLF (TELNET).
1973 */
1974 if (MODE_LOCAL_CHARS(globalmode)) {
1975 NETADD('\r');
1976 }
1977 NETADD('\n');
1978 bol = flushline = 1;
1979 break;
1980 case '\r':
1981 if (!crlf) {
1982 NET2ADD('\r', '\0');
1983 } else {
1984 NET2ADD('\r', '\n');
1985 }
1986 bol = flushline = 1;
1987 break;
1988 case IAC:
1989 NET2ADD(IAC, IAC);
1990 break;
1991 default:
1992 NETADD(c);
1993 break;
1994 }
1995 } else if (c == IAC) {
1996 NET2ADD(IAC, IAC);
1997 } else {
1998 NETADD(c);
1999 }
2000 }
2001 if (count)
2002 ring_consumed(&ttyiring, count);
2003 return returnValue||count; /* Non-zero if we did anything */
2004 }
2005 \f
2006 /*
2007 * Scheduler()
2008 *
2009 * Try to do something.
2010 *
2011 * If we do something useful, return 1; else return 0.
2012 *
2013 */
2014
2015 static int
2016 Scheduler(int block)
2017 {
2018 /* One wants to be a bit careful about setting returnValue
2019 * to one, since a one implies we did some useful work,
2020 * and therefore probably won't be called to block next
2021 */
2022 int returnValue;
2023 int netin, netout, netex, ttyin, ttyout;
2024
2025 /* Decide which rings should be processed */
2026
2027 netout = ring_full_count(&netoring) &&
2028 (flushline ||
2029 (my_want_state_is_wont(TELOPT_LINEMODE)
2030 #ifdef KLUDGELINEMODE
2031 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
2032 #endif
2033 ) ||
2034 my_want_state_is_will(TELOPT_BINARY));
2035 ttyout = ring_full_count(&ttyoring);
2036
2037 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0);
2038
2039 netin = !ISend && ring_empty_count(&netiring);
2040
2041 netex = !SYNCHing;
2042
2043 /* Call to system code to process rings */
2044
2045 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
2046
2047 /* Now, look at the input rings, looking for work to do. */
2048
2049 if (ring_full_count(&ttyiring)) {
2050 returnValue |= telsnd();
2051 }
2052
2053 if (ring_full_count(&netiring)) {
2054 returnValue |= telrcv();
2055 }
2056 return returnValue;
2057 }
2058 \f
2059 #ifdef AUTHENTICATION
2060 #define __unusedhere
2061 #else
2062 #define __unusedhere __unused
2063 #endif
2064 /*
2065 * Select from tty and network...
2066 */
2067 void
2068 telnet(char *user __unusedhere)
2069 {
2070 sys_telnet_init();
2071
2072 #ifdef AUTHENTICATION
2073 #ifdef ENCRYPTION
2074 {
2075 static char local_host[256] = { 0 };
2076
2077 if (!local_host[0]) {
2078 gethostname(local_host, sizeof(local_host));
2079 local_host[sizeof(local_host)-1] = 0;
2080 }
2081 auth_encrypt_init(local_host, hostname, "TELNET", 0);
2082 auth_encrypt_user(user);
2083 }
2084 #endif
2085 #endif
2086 if (telnetport) {
2087 #ifdef AUTHENTICATION
2088 if (autologin)
2089 send_will(TELOPT_AUTHENTICATION, 1);
2090 #endif
2091 #ifdef ENCRYPTION
2092 send_do(TELOPT_ENCRYPT, 1);
2093 send_will(TELOPT_ENCRYPT, 1);
2094 #endif /* ENCRYPTION */
2095 send_do(TELOPT_SGA, 1);
2096 send_will(TELOPT_TTYPE, 1);
2097 send_will(TELOPT_NAWS, 1);
2098 send_will(TELOPT_TSPEED, 1);
2099 send_will(TELOPT_LFLOW, 1);
2100 send_will(TELOPT_LINEMODE, 1);
2101 send_will(TELOPT_NEW_ENVIRON, 1);
2102 send_do(TELOPT_STATUS, 1);
2103 if (env_getvalue("DISPLAY"))
2104 send_will(TELOPT_XDISPLOC, 1);
2105 if (eight)
2106 tel_enter_binary(eight);
2107 }
2108
2109 for (;;) {
2110 int schedValue;
2111
2112 while ((schedValue = Scheduler(0)) != 0) {
2113 if (schedValue == -1) {
2114 setcommandmode();
2115 return;
2116 }
2117 }
2118
2119 if (Scheduler(1) == -1) {
2120 setcommandmode();
2121 return;
2122 }
2123 }
2124 }
2125 \f
2126 #if 0 /* XXX - this not being in is a bug */
2127 /*
2128 * nextitem()
2129 *
2130 * Return the address of the next "item" in the TELNET data
2131 * stream. This will be the address of the next character if
2132 * the current address is a user data character, or it will
2133 * be the address of the character following the TELNET command
2134 * if the current address is a TELNET IAC ("I Am a Command")
2135 * character.
2136 */
2137
2138 static char *
2139 nextitem(char *current)
2140 {
2141 if ((*current&0xff) != IAC) {
2142 return current+1;
2143 }
2144 switch (*(current+1)&0xff) {
2145 case DO:
2146 case DONT:
2147 case WILL:
2148 case WONT:
2149 return current+3;
2150 case SB: /* loop forever looking for the SE */
2151 {
2152 char *look = current+2;
2153
2154 for (;;) {
2155 if ((*look++&0xff) == IAC) {
2156 if ((*look++&0xff) == SE) {
2157 return look;
2158 }
2159 }
2160 }
2161 }
2162 default:
2163 return current+2;
2164 }
2165 }
2166 #endif /* 0 */
2167
2168 /*
2169 * netclear()
2170 *
2171 * We are about to do a TELNET SYNCH operation. Clear
2172 * the path to the network.
2173 *
2174 * Things are a bit tricky since we may have sent the first
2175 * byte or so of a previous TELNET command into the network.
2176 * So, we have to scan the network buffer from the beginning
2177 * until we are up to where we want to be.
2178 *
2179 * A side effect of what we do, just to keep things
2180 * simple, is to clear the urgent data pointer. The principal
2181 * caller should be setting the urgent data pointer AFTER calling
2182 * us in any case.
2183 */
2184
2185 static void
2186 netclear(void)
2187 {
2188 /* Deleted */
2189 }
2190 \f
2191 /*
2192 * These routines add various telnet commands to the data stream.
2193 */
2194
2195 static void
2196 doflush(void)
2197 {
2198 NET2ADD(IAC, DO);
2199 NETADD(TELOPT_TM);
2200 flushline = 1;
2201 flushout = 1;
2202 (void) ttyflush(1); /* Flush/drop output */
2203 /* do printoption AFTER flush, otherwise the output gets tossed... */
2204 printoption("SENT", DO, TELOPT_TM);
2205 }
2206
2207 void
2208 xmitAO(void)
2209 {
2210 NET2ADD(IAC, AO);
2211 printoption("SENT", IAC, AO);
2212 if (autoflush) {
2213 doflush();
2214 }
2215 }
2216
2217 void
2218 xmitEL(void)
2219 {
2220 NET2ADD(IAC, EL);
2221 printoption("SENT", IAC, EL);
2222 }
2223
2224 void
2225 xmitEC(void)
2226 {
2227 NET2ADD(IAC, EC);
2228 printoption("SENT", IAC, EC);
2229 }
2230
2231 int
2232 dosynch(char *ch __unused)
2233 {
2234 netclear(); /* clear the path to the network */
2235 NETADD(IAC);
2236 setneturg();
2237 NETADD(DM);
2238 printoption("SENT", IAC, DM);
2239 return 1;
2240 }
2241
2242 int want_status_response = 0;
2243
2244 int
2245 get_status(char *ch __unused)
2246 {
2247 unsigned char tmp[16];
2248 unsigned char *cp;
2249
2250 if (my_want_state_is_dont(TELOPT_STATUS)) {
2251 printf("Remote side does not support STATUS option\n");
2252 return 0;
2253 }
2254 cp = tmp;
2255
2256 *cp++ = IAC;
2257 *cp++ = SB;
2258 *cp++ = TELOPT_STATUS;
2259 *cp++ = TELQUAL_SEND;
2260 *cp++ = IAC;
2261 *cp++ = SE;
2262 if (NETROOM() >= cp - tmp) {
2263 ring_supply_data(&netoring, tmp, cp-tmp);
2264 printsub('>', tmp+2, cp - tmp - 2);
2265 }
2266 ++want_status_response;
2267 return 1;
2268 }
2269
2270 void
2271 intp(void)
2272 {
2273 NET2ADD(IAC, IP);
2274 printoption("SENT", IAC, IP);
2275 flushline = 1;
2276 if (autoflush) {
2277 doflush();
2278 }
2279 if (autosynch) {
2280 dosynch(NULL);
2281 }
2282 }
2283
2284 void
2285 sendbrk(void)
2286 {
2287 NET2ADD(IAC, BREAK);
2288 printoption("SENT", IAC, BREAK);
2289 flushline = 1;
2290 if (autoflush) {
2291 doflush();
2292 }
2293 if (autosynch) {
2294 dosynch(NULL);
2295 }
2296 }
2297
2298 void
2299 sendabort(void)
2300 {
2301 NET2ADD(IAC, ABORT);
2302 printoption("SENT", IAC, ABORT);
2303 flushline = 1;
2304 if (autoflush) {
2305 doflush();
2306 }
2307 if (autosynch) {
2308 dosynch(NULL);
2309 }
2310 }
2311
2312 void
2313 sendsusp(void)
2314 {
2315 NET2ADD(IAC, SUSP);
2316 printoption("SENT", IAC, SUSP);
2317 flushline = 1;
2318 if (autoflush) {
2319 doflush();
2320 }
2321 if (autosynch) {
2322 dosynch(NULL);
2323 }
2324 }
2325
2326 void
2327 sendeof(void)
2328 {
2329 NET2ADD(IAC, xEOF);
2330 printoption("SENT", IAC, xEOF);
2331 }
2332
2333 void
2334 sendayt(void)
2335 {
2336 NET2ADD(IAC, AYT);
2337 printoption("SENT", IAC, AYT);
2338 }
2339
2340 /*
2341 * Send a window size update to the remote system.
2342 */
2343
2344 void
2345 sendnaws(void)
2346 {
2347 long rows, cols;
2348 unsigned char tmp[16];
2349 unsigned char *cp;
2350
2351 if (my_state_is_wont(TELOPT_NAWS))
2352 return;
2353
2354 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \
2355 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; }
2356
2357 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */
2358 return;
2359 }
2360
2361 cp = tmp;
2362
2363 *cp++ = IAC;
2364 *cp++ = SB;
2365 *cp++ = TELOPT_NAWS;
2366 PUTSHORT(cp, cols);
2367 PUTSHORT(cp, rows);
2368 *cp++ = IAC;
2369 *cp++ = SE;
2370 if (NETROOM() >= cp - tmp) {
2371 ring_supply_data(&netoring, tmp, cp-tmp);
2372 printsub('>', tmp+2, cp - tmp - 2);
2373 }
2374 }
2375
2376 void
2377 tel_enter_binary(int rw)
2378 {
2379 if (rw&1)
2380 send_do(TELOPT_BINARY, 1);
2381 if (rw&2)
2382 send_will(TELOPT_BINARY, 1);
2383 }
2384
2385 void
2386 tel_leave_binary(int rw)
2387 {
2388 if (rw&1)
2389 send_dont(TELOPT_BINARY, 1);
2390 if (rw&2)
2391 send_wont(TELOPT_BINARY, 1);
2392 }
mirror of network_cmds