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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if 0
31 #ifndef lint
32 static const char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95";
33 #endif
34 #endif
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/types.h>
39
40 /* By the way, we need to include curses.h before telnet.h since,
41 * among other things, telnet.h #defines 'DO', which is a variable
42 * declared in curses.h.
43 */
44
45 #include <ctype.h>
46 #include <curses.h>
47 #include <signal.h>
48 #include <stdlib.h>
49 #include <term.h>
50 #include <unistd.h>
51 #include <arpa/inet.h>
52 #include <arpa/telnet.h>
53
54 #include "ring.h"
55
56 #include "defines.h"
57 #include "externs.h"
58 #include "types.h"
59 #include "general.h"
60
61 #ifdef AUTHENTICATION
62 #include <libtelnet/auth.h>
63 #endif
64 #ifdef ENCRYPTION
65 #include <libtelnet/encrypt.h>
66 #endif
67 #include <libtelnet/misc.h>
68
69 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
70
71 static unsigned char subbuffer[SUBBUFSIZE],
72 *subpointer, *subend; /* buffer for sub-options */
73 #define SB_CLEAR() subpointer = subbuffer;
74 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
75 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
76 *subpointer++ = (c); \
77 }
78
79 #define SB_GET() ((*subpointer++)&0xff)
80 #define SB_PEEK() ((*subpointer)&0xff)
81 #define SB_EOF() (subpointer >= subend)
82 #define SB_LEN() (subend - subpointer)
83
84 char options[256]; /* The combined options */
85 char do_dont_resp[256];
86 char will_wont_resp[256];
87
88 int
89 eight = 0,
90 autologin = 0, /* Autologin anyone? */
91 skiprc = 0,
92 connected,
93 showoptions,
94 ISend, /* trying to send network data in */
95 telnet_debug = 0,
96 crmod,
97 netdata, /* Print out network data flow */
98 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
99 telnetport,
100 SYNCHing, /* we are in TELNET SYNCH mode */
101 flushout, /* flush output */
102 autoflush = 0, /* flush output when interrupting? */
103 autosynch, /* send interrupt characters with SYNCH? */
104 localflow, /* we handle flow control locally */
105 restartany, /* if flow control enabled, restart on any character */
106 localchars, /* we recognize interrupt/quit */
107 donelclchars, /* the user has set "localchars" */
108 donebinarytoggle, /* the user has put us in binary */
109 dontlecho, /* do we suppress local echoing right now? */
110 globalmode,
111 doaddrlookup = 1, /* do a reverse address lookup? */
112 clienteof = 0;
113
114 char *prompt = 0;
115 #ifdef ENCRYPTION
116 char *line; /* hack around breakage in sra.c :-( !! */
117 #endif
118
119 cc_t escape;
120 cc_t rlogin;
121 #ifdef KLUDGELINEMODE
122 cc_t echoc;
123 #endif
124
125 /*
126 * Telnet receiver states for fsm
127 */
128 #define TS_DATA 0
129 #define TS_IAC 1
130 #define TS_WILL 2
131 #define TS_WONT 3
132 #define TS_DO 4
133 #define TS_DONT 5
134 #define TS_CR 6
135 #define TS_SB 7 /* sub-option collection */
136 #define TS_SE 8 /* looking for sub-option end */
137
138 static int telrcv_state;
139 #ifdef OLD_ENVIRON
140 unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
141 #else
142 # define telopt_environ TELOPT_NEW_ENVIRON
143 #endif
144
145 jmp_buf toplevel;
146
147 int flushline;
148 int linemode;
149
150 #ifdef KLUDGELINEMODE
151 int kludgelinemode = 1;
152 #endif
153
154 static int is_unique(char *, char **, char **);
155
156 /*
157 * The following are some clocks used to decide how to interpret
158 * the relationship between various variables.
159 */
160
161 Clocks clocks;
162
163 /*
164 * Initialize telnet environment.
165 */
166
167 void
init_telnet(void)168 init_telnet(void)
169 {
170 env_init();
171
172 SB_CLEAR();
173 ClearArray(options);
174
175 connected = ISend = localflow = donebinarytoggle = 0;
176 #ifdef AUTHENTICATION
177 #ifdef ENCRYPTION
178 auth_encrypt_connect(connected);
179 #endif
180 #endif
181 restartany = -1;
182
183 SYNCHing = 0;
184
185 /* Don't change NetTrace */
186
187 escape = CONTROL(']');
188 rlogin = _POSIX_VDISABLE;
189 #ifdef KLUDGELINEMODE
190 echoc = CONTROL('E');
191 #endif
192
193 flushline = 1;
194 telrcv_state = TS_DATA;
195 }
196
197
198 /*
199 * These routines are in charge of sending option negotiations
200 * to the other side.
201 *
202 * The basic idea is that we send the negotiation if either side
203 * is in disagreement as to what the current state should be.
204 */
205
206 unsigned char ComPortBaudRate[256];
207
208 void
DoBaudRate(char * arg)209 DoBaudRate(char *arg)
210 {
211 char *temp, temp2[11];
212 int i;
213 uint32_t baudrate;
214
215 errno = 0;
216 baudrate = (uint32_t)strtol(arg, &temp, 10);
217 if (temp[0] != '\0' || (baudrate == 0 && errno != 0))
218 ExitString("Invalid baud rate provided.\n", 1);
219
220 for (i = 1; termspeeds[i].speed != -1; i++)
221 if (baudrate == termspeeds[i].speed)
222 break;
223 if (termspeeds[i].speed == -1)
224 ExitString("Invalid baud rate provided.\n", 1);
225
226 strlcpy(ComPortBaudRate, arg, sizeof(ComPortBaudRate));
227
228 if (NETROOM() < sizeof(temp2)) {
229 ExitString("No room in buffer for baud rate.\n", 1);
230 /* NOTREACHED */
231 }
232
233 snprintf(temp2, sizeof(temp2), "%c%c%c%c....%c%c", IAC, SB, TELOPT_COMPORT,
234 COMPORT_SET_BAUDRATE, IAC, SE);
235
236 baudrate = htonl(baudrate);
237 memcpy(&temp2[4], &baudrate, sizeof(baudrate));
238 ring_supply_data(&netoring, temp2, sizeof(temp2));
239 printsub('>', &temp[2], sizeof(temp2) - 2);
240 }
241
242 void
send_do(int c,int init)243 send_do(int c, int init)
244 {
245 if (init) {
246 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
247 my_want_state_is_do(c))
248 return;
249 set_my_want_state_do(c);
250 do_dont_resp[c]++;
251 }
252 if (telnetport < 0)
253 return;
254 NET2ADD(IAC, DO);
255 NETADD(c);
256 printoption("SENT", DO, c);
257 }
258
259 void
send_dont(int c,int init)260 send_dont(int c, int init)
261 {
262 if (init) {
263 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
264 my_want_state_is_dont(c))
265 return;
266 set_my_want_state_dont(c);
267 do_dont_resp[c]++;
268 }
269 if (telnetport < 0)
270 return;
271 NET2ADD(IAC, DONT);
272 NETADD(c);
273 printoption("SENT", DONT, c);
274 }
275
276 void
send_will(int c,int init)277 send_will(int c, int init)
278 {
279 if (init) {
280 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
281 my_want_state_is_will(c))
282 return;
283 set_my_want_state_will(c);
284 will_wont_resp[c]++;
285 }
286 if (telnetport < 0)
287 return;
288 NET2ADD(IAC, WILL);
289 NETADD(c);
290 printoption("SENT", WILL, c);
291 }
292
293 void
send_wont(int c,int init)294 send_wont(int c, int init)
295 {
296 if (init) {
297 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
298 my_want_state_is_wont(c))
299 return;
300 set_my_want_state_wont(c);
301 will_wont_resp[c]++;
302 }
303 if (telnetport < 0)
304 return;
305 NET2ADD(IAC, WONT);
306 NETADD(c);
307 printoption("SENT", WONT, c);
308 }
309
310 void
willoption(int option)311 willoption(int option)
312 {
313 int new_state_ok = 0;
314
315 if (do_dont_resp[option]) {
316 --do_dont_resp[option];
317 if (do_dont_resp[option] && my_state_is_do(option))
318 --do_dont_resp[option];
319 }
320
321 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
322
323 switch (option) {
324
325 case TELOPT_ECHO:
326 case TELOPT_BINARY:
327 case TELOPT_SGA:
328 settimer(modenegotiated);
329 /* FALLTHROUGH */
330 case TELOPT_STATUS:
331 #ifdef AUTHENTICATION
332 case TELOPT_AUTHENTICATION:
333 #endif
334 #ifdef ENCRYPTION
335 case TELOPT_ENCRYPT:
336 #endif /* ENCRYPTION */
337 new_state_ok = 1;
338 break;
339
340 case TELOPT_TM:
341 if (flushout)
342 flushout = 0;
343 /*
344 * Special case for TM. If we get back a WILL,
345 * pretend we got back a WONT.
346 */
347 set_my_want_state_dont(option);
348 set_my_state_dont(option);
349 return; /* Never reply to TM will's/wont's */
350
351 case TELOPT_LINEMODE:
352 default:
353 break;
354 }
355
356 if (new_state_ok) {
357 set_my_want_state_do(option);
358 send_do(option, 0);
359 setconnmode(0); /* possibly set new tty mode */
360 } else {
361 do_dont_resp[option]++;
362 send_dont(option, 0);
363 }
364 }
365 set_my_state_do(option);
366 #ifdef ENCRYPTION
367 if (option == TELOPT_ENCRYPT)
368 encrypt_send_support();
369 #endif /* ENCRYPTION */
370 }
371
372 void
wontoption(int option)373 wontoption(int option)
374 {
375 if (do_dont_resp[option]) {
376 --do_dont_resp[option];
377 if (do_dont_resp[option] && my_state_is_dont(option))
378 --do_dont_resp[option];
379 }
380
381 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
382
383 switch (option) {
384
385 #ifdef KLUDGELINEMODE
386 case TELOPT_SGA:
387 if (!kludgelinemode)
388 break;
389 /* FALLTHROUGH */
390 #endif
391 case TELOPT_ECHO:
392 settimer(modenegotiated);
393 break;
394
395 case TELOPT_TM:
396 if (flushout)
397 flushout = 0;
398 set_my_want_state_dont(option);
399 set_my_state_dont(option);
400 return; /* Never reply to TM will's/wont's */
401
402 default:
403 break;
404 }
405 set_my_want_state_dont(option);
406 if (my_state_is_do(option))
407 send_dont(option, 0);
408 setconnmode(0); /* Set new tty mode */
409 } else if (option == TELOPT_TM) {
410 /*
411 * Special case for TM.
412 */
413 if (flushout)
414 flushout = 0;
415 set_my_want_state_dont(option);
416 }
417 set_my_state_dont(option);
418 }
419
420 static void
dooption(int option)421 dooption(int option)
422 {
423 int new_state_ok = 0;
424
425 if (will_wont_resp[option]) {
426 --will_wont_resp[option];
427 if (will_wont_resp[option] && my_state_is_will(option))
428 --will_wont_resp[option];
429 }
430
431 if (will_wont_resp[option] == 0) {
432 if (my_want_state_is_wont(option)) {
433
434 switch (option) {
435
436 case TELOPT_TM:
437 /*
438 * Special case for TM. We send a WILL, but pretend
439 * we sent WONT.
440 */
441 send_will(option, 0);
442 set_my_want_state_wont(TELOPT_TM);
443 set_my_state_wont(TELOPT_TM);
444 return;
445
446 case TELOPT_BINARY: /* binary mode */
447 case TELOPT_NAWS: /* window size */
448 case TELOPT_TSPEED: /* terminal speed */
449 case TELOPT_LFLOW: /* local flow control */
450 case TELOPT_TTYPE: /* terminal type option */
451 case TELOPT_SGA: /* no big deal */
452 #ifdef ENCRYPTION
453 case TELOPT_ENCRYPT: /* encryption variable option */
454 #endif /* ENCRYPTION */
455 new_state_ok = 1;
456 break;
457
458 case TELOPT_NEW_ENVIRON: /* New environment variable option */
459 #ifdef OLD_ENVIRON
460 if (my_state_is_will(TELOPT_OLD_ENVIRON))
461 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */
462 goto env_common;
463 case TELOPT_OLD_ENVIRON: /* Old environment variable option */
464 if (my_state_is_will(TELOPT_NEW_ENVIRON))
465 break; /* Don't enable if new one is in use! */
466 env_common:
467 telopt_environ = option;
468 #endif
469 new_state_ok = 1;
470 break;
471
472 #ifdef AUTHENTICATION
473 case TELOPT_AUTHENTICATION:
474 if (autologin)
475 new_state_ok = 1;
476 break;
477 #endif
478
479 case TELOPT_XDISPLOC: /* X Display location */
480 if (env_getvalue("DISPLAY"))
481 new_state_ok = 1;
482 break;
483
484 case TELOPT_LINEMODE:
485 #ifdef KLUDGELINEMODE
486 kludgelinemode = 0;
487 send_do(TELOPT_SGA, 1);
488 #endif
489 set_my_want_state_will(TELOPT_LINEMODE);
490 send_will(option, 0);
491 set_my_state_will(TELOPT_LINEMODE);
492 slc_init();
493 return;
494
495 case TELOPT_ECHO: /* We're never going to echo... */
496 default:
497 break;
498 }
499
500 if (new_state_ok) {
501 set_my_want_state_will(option);
502 send_will(option, 0);
503 setconnmode(0); /* Set new tty mode */
504 } else {
505 will_wont_resp[option]++;
506 send_wont(option, 0);
507 }
508 } else {
509 /*
510 * Handle options that need more things done after the
511 * other side has acknowledged the option.
512 */
513 switch (option) {
514 case TELOPT_LINEMODE:
515 #ifdef KLUDGELINEMODE
516 kludgelinemode = 0;
517 send_do(TELOPT_SGA, 1);
518 #endif
519 set_my_state_will(option);
520 slc_init();
521 send_do(TELOPT_SGA, 0);
522 return;
523 }
524 }
525 }
526 set_my_state_will(option);
527 }
528
529 static void
dontoption(int option)530 dontoption(int option)
531 {
532
533 if (will_wont_resp[option]) {
534 --will_wont_resp[option];
535 if (will_wont_resp[option] && my_state_is_wont(option))
536 --will_wont_resp[option];
537 }
538
539 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
540 switch (option) {
541 case TELOPT_LINEMODE:
542 linemode = 0; /* put us back to the default state */
543 break;
544 #ifdef OLD_ENVIRON
545 case TELOPT_NEW_ENVIRON:
546 /*
547 * The new environ option wasn't recognized, try
548 * the old one.
549 */
550 send_will(TELOPT_OLD_ENVIRON, 1);
551 telopt_environ = TELOPT_OLD_ENVIRON;
552 break;
553 #endif
554 }
555 /* we always accept a DONT */
556 set_my_want_state_wont(option);
557 if (my_state_is_will(option))
558 send_wont(option, 0);
559 setconnmode(0); /* Set new tty mode */
560 }
561 set_my_state_wont(option);
562 }
563
564 /*
565 * Given a buffer returned by tgetent(), this routine will turn
566 * the pipe separated list of names in the buffer into an array
567 * of pointers to null terminated names. We toss out any bad,
568 * duplicate, or verbose names (names with spaces).
569 */
570
571 static const char *name_unknown = "UNKNOWN";
572 static const char *unknown[] = { NULL, NULL };
573
574 static const char **
mklist(char * buf,char * name)575 mklist(char *buf, char *name)
576 {
577 int n;
578 char c, *cp, **argvp, *cp2, **argv, **avt;
579
580 if (name) {
581 if (strlen(name) > 40) {
582 name = 0;
583 unknown[0] = name_unknown;
584 } else {
585 unknown[0] = name;
586 upcase(name);
587 }
588 } else
589 unknown[0] = name_unknown;
590 /*
591 * Count up the number of names.
592 */
593 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) {
594 if (*cp == '|')
595 n++;
596 }
597 /*
598 * Allocate an array to put the name pointers into
599 */
600 argv = (char **)malloc((n+3)*sizeof(char *));
601 if (argv == 0)
602 return(unknown);
603
604 /*
605 * Fill up the array of pointers to names.
606 */
607 *argv = 0;
608 argvp = argv+1;
609 n = 0;
610 for (cp = cp2 = buf; (c = *cp); cp++) {
611 if (c == '|' || c == ':') {
612 *cp++ = '\0';
613 /*
614 * Skip entries that have spaces or are over 40
615 * characters long. If this is our environment
616 * name, then put it up front. Otherwise, as
617 * long as this is not a duplicate name (case
618 * insensitive) add it to the list.
619 */
620 if (n || (cp - cp2 > 41))
621 ;
622 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
623 *argv = cp2;
624 else if (is_unique(cp2, argv+1, argvp))
625 *argvp++ = cp2;
626 if (c == ':')
627 break;
628 /*
629 * Skip multiple delimiters. Reset cp2 to
630 * the beginning of the next name. Reset n,
631 * the flag for names with spaces.
632 */
633 while ((c = *cp) == '|')
634 cp++;
635 cp2 = cp;
636 n = 0;
637 }
638 /*
639 * Skip entries with spaces or non-ascii values.
640 * Convert lower case letters to upper case.
641 */
642 if ((c == ' ') || !isascii(c))
643 n = 1;
644 else if (islower(c))
645 *cp = toupper(c);
646 }
647
648 /*
649 * Check for an old V6 2 character name. If the second
650 * name points to the beginning of the buffer, and is
651 * only 2 characters long, move it to the end of the array.
652 */
653 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
654 --argvp;
655 for (avt = &argv[1]; avt < argvp; avt++)
656 *avt = *(avt+1);
657 *argvp++ = buf;
658 }
659
660 /*
661 * Duplicate last name, for TTYPE option, and null
662 * terminate the array. If we didn't find a match on
663 * our terminal name, put that name at the beginning.
664 */
665 cp = *(argvp-1);
666 *argvp++ = cp;
667 *argvp = 0;
668
669 if (*argv == 0) {
670 if (name)
671 *argv = name;
672 else {
673 --argvp;
674 for (avt = argv; avt < argvp; avt++)
675 *avt = *(avt+1);
676 }
677 }
678 if (*argv)
679 return((const char **)argv);
680 else
681 return(unknown);
682 }
683
684 static int
is_unique(char * name,char ** as,char ** ae)685 is_unique(char *name, char **as, char **ae)
686 {
687 char **ap;
688 int n;
689
690 n = strlen(name) + 1;
691 for (ap = as; ap < ae; ap++)
692 if (strncasecmp(*ap, name, n) == 0)
693 return(0);
694 return (1);
695 }
696
697 #ifdef TERMCAP
698 char termbuf[1024];
699
700 /*ARGSUSED*/
701 static int
setupterm(char * tname,int fd,int * errp)702 setupterm(char *tname, int fd, int *errp)
703 {
704 if (tgetent(termbuf, tname) == 1) {
705 termbuf[1023] = '\0';
706 if (errp)
707 *errp = 1;
708 return(0);
709 }
710 if (errp)
711 *errp = 0;
712 return(-1);
713 }
714 #else
715 #define termbuf ttytype
716 extern char ttytype[];
717 #endif
718
719 int resettermname = 1;
720
721 static const char *
gettermname(void)722 gettermname(void)
723 {
724 char *tname;
725 static const char **tnamep = 0;
726 static const char **next;
727 int err;
728
729 if (resettermname) {
730 resettermname = 0;
731 if (tnamep && tnamep != unknown)
732 free(tnamep);
733 if ((tname = env_getvalue("TERM")) &&
734 (setupterm(tname, 1, &err) == 0)) {
735 tnamep = mklist(termbuf, tname);
736 } else {
737 if (tname && (strlen(tname) <= 40)) {
738 unknown[0] = tname;
739 upcase(tname);
740 } else
741 unknown[0] = name_unknown;
742 tnamep = unknown;
743 }
744 next = tnamep;
745 }
746 if (*next == 0)
747 next = tnamep;
748 return(*next++);
749 }
750 /*
751 * suboption()
752 *
753 * Look at the sub-option buffer, and try to be helpful to the other
754 * side.
755 *
756 * Currently we recognize:
757 *
758 * Terminal type, send request.
759 * Terminal speed (send request).
760 * Local flow control (is request).
761 * Linemode
762 */
763
764 static void
suboption(void)765 suboption(void)
766 {
767 unsigned char subchar;
768
769 printsub('<', subbuffer, SB_LEN()+2);
770 switch (subchar = SB_GET()) {
771 case TELOPT_TTYPE:
772 if (my_want_state_is_wont(TELOPT_TTYPE))
773 return;
774 if (SB_EOF() || SB_GET() != TELQUAL_SEND) {
775 return;
776 } else {
777 const char *name;
778 unsigned char temp[50];
779 int len;
780
781 name = gettermname();
782 len = strlen(name) + 4 + 2;
783 if (len < NETROOM()) {
784 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
785 TELQUAL_IS, name, IAC, SE);
786 ring_supply_data(&netoring, temp, len);
787 printsub('>', &temp[2], len-2);
788 } else {
789 ExitString("No room in buffer for terminal type.\n", 1);
790 /*NOTREACHED*/
791 }
792 }
793 break;
794 case TELOPT_TSPEED:
795 if (my_want_state_is_wont(TELOPT_TSPEED))
796 return;
797 if (SB_EOF())
798 return;
799 if (SB_GET() == TELQUAL_SEND) {
800 long ospeed, ispeed;
801 unsigned char temp[50];
802 int len;
803
804 TerminalSpeeds(&ispeed, &ospeed);
805
806 snprintf((char *)temp, sizeof(temp), "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED,
807 TELQUAL_IS, ospeed, ispeed, IAC, SE);
808 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
809
810 if (len < NETROOM()) {
811 ring_supply_data(&netoring, temp, len);
812 printsub('>', temp+2, len - 2);
813 }
814 /*@*/ else printf("lm_will: not enough room in buffer\n");
815 }
816 break;
817 case TELOPT_LFLOW:
818 if (my_want_state_is_wont(TELOPT_LFLOW))
819 return;
820 if (SB_EOF())
821 return;
822 switch(SB_GET()) {
823 case LFLOW_RESTART_ANY:
824 restartany = 1;
825 break;
826 case LFLOW_RESTART_XON:
827 restartany = 0;
828 break;
829 case LFLOW_ON:
830 localflow = 1;
831 break;
832 case LFLOW_OFF:
833 localflow = 0;
834 break;
835 default:
836 return;
837 }
838 setcommandmode();
839 setconnmode(0);
840 break;
841
842 case TELOPT_LINEMODE:
843 if (my_want_state_is_wont(TELOPT_LINEMODE))
844 return;
845 if (SB_EOF())
846 return;
847 switch (SB_GET()) {
848 case WILL:
849 lm_will(subpointer, SB_LEN());
850 break;
851 case WONT:
852 lm_wont(subpointer, SB_LEN());
853 break;
854 case DO:
855 lm_do(subpointer, SB_LEN());
856 break;
857 case DONT:
858 lm_dont(subpointer, SB_LEN());
859 break;
860 case LM_SLC:
861 slc(subpointer, SB_LEN());
862 break;
863 case LM_MODE:
864 lm_mode(subpointer, SB_LEN(), 0);
865 break;
866 default:
867 break;
868 }
869 break;
870
871 #ifdef OLD_ENVIRON
872 case TELOPT_OLD_ENVIRON:
873 #endif
874 case TELOPT_NEW_ENVIRON:
875 if (SB_EOF())
876 return;
877 switch(SB_PEEK()) {
878 case TELQUAL_IS:
879 case TELQUAL_INFO:
880 if (my_want_state_is_dont(subchar))
881 return;
882 break;
883 case TELQUAL_SEND:
884 if (my_want_state_is_wont(subchar)) {
885 return;
886 }
887 break;
888 default:
889 return;
890 }
891 env_opt(subpointer, SB_LEN());
892 break;
893
894 case TELOPT_XDISPLOC:
895 if (my_want_state_is_wont(TELOPT_XDISPLOC))
896 return;
897 if (SB_EOF())
898 return;
899 if (SB_GET() == TELQUAL_SEND) {
900 unsigned char temp[50], *dp;
901 int len;
902
903 if ((dp = env_getvalue("DISPLAY")) == NULL ||
904 strlen(dp) > sizeof(temp) - 7) {
905 /*
906 * Something happened, we no longer have a DISPLAY
907 * variable. Or it is too long. So, turn off the option.
908 */
909 send_wont(TELOPT_XDISPLOC, 1);
910 break;
911 }
912 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB,
913 TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE);
914 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
915
916 if (len < NETROOM()) {
917 ring_supply_data(&netoring, temp, len);
918 printsub('>', temp+2, len - 2);
919 }
920 /*@*/ else printf("lm_will: not enough room in buffer\n");
921 }
922 break;
923
924 #ifdef AUTHENTICATION
925 case TELOPT_AUTHENTICATION: {
926 if (!autologin)
927 break;
928 if (SB_EOF())
929 return;
930 switch(SB_GET()) {
931 case TELQUAL_IS:
932 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
933 return;
934 auth_is(subpointer, SB_LEN());
935 break;
936 case TELQUAL_SEND:
937 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
938 return;
939 auth_send(subpointer, SB_LEN());
940 break;
941 case TELQUAL_REPLY:
942 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
943 return;
944 auth_reply(subpointer, SB_LEN());
945 break;
946 case TELQUAL_NAME:
947 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
948 return;
949 auth_name(subpointer, SB_LEN());
950 break;
951 }
952 }
953 break;
954 #endif
955 #ifdef ENCRYPTION
956 case TELOPT_ENCRYPT:
957 if (SB_EOF())
958 return;
959 switch(SB_GET()) {
960 case ENCRYPT_START:
961 if (my_want_state_is_dont(TELOPT_ENCRYPT))
962 return;
963 encrypt_start(subpointer, SB_LEN());
964 break;
965 case ENCRYPT_END:
966 if (my_want_state_is_dont(TELOPT_ENCRYPT))
967 return;
968 encrypt_end();
969 break;
970 case ENCRYPT_SUPPORT:
971 if (my_want_state_is_wont(TELOPT_ENCRYPT))
972 return;
973 encrypt_support(subpointer, SB_LEN());
974 break;
975 case ENCRYPT_REQSTART:
976 if (my_want_state_is_wont(TELOPT_ENCRYPT))
977 return;
978 encrypt_request_start(subpointer, SB_LEN());
979 break;
980 case ENCRYPT_REQEND:
981 if (my_want_state_is_wont(TELOPT_ENCRYPT))
982 return;
983 /*
984 * We can always send an REQEND so that we cannot
985 * get stuck encrypting. We should only get this
986 * if we have been able to get in the correct mode
987 * anyhow.
988 */
989 encrypt_request_end();
990 break;
991 case ENCRYPT_IS:
992 if (my_want_state_is_dont(TELOPT_ENCRYPT))
993 return;
994 encrypt_is(subpointer, SB_LEN());
995 break;
996 case ENCRYPT_REPLY:
997 if (my_want_state_is_wont(TELOPT_ENCRYPT))
998 return;
999 encrypt_reply(subpointer, SB_LEN());
1000 break;
1001 case ENCRYPT_ENC_KEYID:
1002 if (my_want_state_is_dont(TELOPT_ENCRYPT))
1003 return;
1004 encrypt_enc_keyid(subpointer, SB_LEN());
1005 break;
1006 case ENCRYPT_DEC_KEYID:
1007 if (my_want_state_is_wont(TELOPT_ENCRYPT))
1008 return;
1009 encrypt_dec_keyid(subpointer, SB_LEN());
1010 break;
1011 default:
1012 break;
1013 }
1014 break;
1015 #endif /* ENCRYPTION */
1016 default:
1017 break;
1018 }
1019 }
1020
1021 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
1022
1023 void
lm_will(unsigned char * cmd,int len)1024 lm_will(unsigned char *cmd, int len)
1025 {
1026 if (len < 1) {
1027 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */
1028 return;
1029 }
1030 switch(cmd[0]) {
1031 case LM_FORWARDMASK: /* We shouldn't ever get this... */
1032 default:
1033 str_lm[3] = DONT;
1034 str_lm[4] = cmd[0];
1035 if (NETROOM() > (int)sizeof(str_lm)) {
1036 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1037 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1038 }
1039 /*@*/ else printf("lm_will: not enough room in buffer\n");
1040 break;
1041 }
1042 }
1043
1044 void
lm_wont(unsigned char * cmd,int len)1045 lm_wont(unsigned char *cmd, int len)
1046 {
1047 if (len < 1) {
1048 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */
1049 return;
1050 }
1051 switch(cmd[0]) {
1052 case LM_FORWARDMASK: /* We shouldn't ever get this... */
1053 default:
1054 /* We are always DONT, so don't respond */
1055 return;
1056 }
1057 }
1058
1059 void
lm_do(unsigned char * cmd,int len)1060 lm_do(unsigned char *cmd, int len)
1061 {
1062 if (len < 1) {
1063 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */
1064 return;
1065 }
1066 switch(cmd[0]) {
1067 case LM_FORWARDMASK:
1068 default:
1069 str_lm[3] = WONT;
1070 str_lm[4] = cmd[0];
1071 if (NETROOM() > (int)sizeof(str_lm)) {
1072 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1073 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1074 }
1075 /*@*/ else printf("lm_do: not enough room in buffer\n");
1076 break;
1077 }
1078 }
1079
1080 void
lm_dont(unsigned char * cmd,int len)1081 lm_dont(unsigned char *cmd, int len)
1082 {
1083 if (len < 1) {
1084 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */
1085 return;
1086 }
1087 switch(cmd[0]) {
1088 case LM_FORWARDMASK:
1089 default:
1090 /* we are always WONT, so don't respond */
1091 break;
1092 }
1093 }
1094
1095 static unsigned char str_lm_mode[] = {
1096 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE
1097 };
1098
1099 void
lm_mode(unsigned char * cmd,int len,int init)1100 lm_mode(unsigned char *cmd, int len, int init)
1101 {
1102 if (len != 1)
1103 return;
1104 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd)
1105 return;
1106 if (*cmd&MODE_ACK)
1107 return;
1108 linemode = *cmd&(MODE_MASK&~MODE_ACK);
1109 str_lm_mode[4] = linemode;
1110 if (!init)
1111 str_lm_mode[4] |= MODE_ACK;
1112 if (NETROOM() > (int)sizeof(str_lm_mode)) {
1113 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode));
1114 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2);
1115 }
1116 /*@*/ else printf("lm_mode: not enough room in buffer\n");
1117 setconnmode(0); /* set changed mode */
1118 }
1119
1120
1121
1122 /*
1123 * slc()
1124 * Handle special character suboption of LINEMODE.
1125 */
1126
1127 struct spc {
1128 cc_t val;
1129 cc_t *valp;
1130 char flags; /* Current flags & level */
1131 char mylevel; /* Maximum level & flags */
1132 } spc_data[NSLC+1];
1133
1134 #define SLC_IMPORT 0
1135 #define SLC_EXPORT 1
1136 #define SLC_RVALUE 2
1137 static int slc_mode = SLC_EXPORT;
1138
1139 void
slc_init(void)1140 slc_init(void)
1141 {
1142 struct spc *spcp;
1143
1144 localchars = 1;
1145 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
1146 spcp->val = 0;
1147 spcp->valp = 0;
1148 spcp->flags = spcp->mylevel = SLC_NOSUPPORT;
1149 }
1150
1151 #define initfunc(func, flags) { \
1152 spcp = &spc_data[func]; \
1153 if ((spcp->valp = tcval(func))) { \
1154 spcp->val = *spcp->valp; \
1155 spcp->mylevel = SLC_VARIABLE|flags; \
1156 } else { \
1157 spcp->val = 0; \
1158 spcp->mylevel = SLC_DEFAULT; \
1159 } \
1160 }
1161
1162 initfunc(SLC_SYNCH, 0);
1163 /* No BRK */
1164 initfunc(SLC_AO, 0);
1165 initfunc(SLC_AYT, 0);
1166 /* No EOR */
1167 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT);
1168 initfunc(SLC_EOF, 0);
1169 #ifndef SYSV_TERMIO
1170 initfunc(SLC_SUSP, SLC_FLUSHIN);
1171 #endif
1172 initfunc(SLC_EC, 0);
1173 initfunc(SLC_EL, 0);
1174 #ifndef SYSV_TERMIO
1175 initfunc(SLC_EW, 0);
1176 initfunc(SLC_RP, 0);
1177 initfunc(SLC_LNEXT, 0);
1178 #endif
1179 initfunc(SLC_XON, 0);
1180 initfunc(SLC_XOFF, 0);
1181 #ifdef SYSV_TERMIO
1182 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE;
1183 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE;
1184 #endif
1185 initfunc(SLC_FORW1, 0);
1186 #ifdef USE_TERMIO
1187 initfunc(SLC_FORW2, 0);
1188 /* No FORW2 */
1189 #endif
1190
1191 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT);
1192 #undef initfunc
1193
1194 if (slc_mode == SLC_EXPORT)
1195 slc_export();
1196 else
1197 slc_import(1);
1198
1199 }
1200
1201 void
slcstate(void)1202 slcstate(void)
1203 {
1204 printf("Special characters are %s values\n",
1205 slc_mode == SLC_IMPORT ? "remote default" :
1206 slc_mode == SLC_EXPORT ? "local" :
1207 "remote");
1208 }
1209
1210 void
slc_mode_export(void)1211 slc_mode_export(void)
1212 {
1213 slc_mode = SLC_EXPORT;
1214 if (my_state_is_will(TELOPT_LINEMODE))
1215 slc_export();
1216 }
1217
1218 void
slc_mode_import(int def)1219 slc_mode_import(int def)
1220 {
1221 slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
1222 if (my_state_is_will(TELOPT_LINEMODE))
1223 slc_import(def);
1224 }
1225
1226 unsigned char slc_import_val[] = {
1227 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
1228 };
1229 unsigned char slc_import_def[] = {
1230 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
1231 };
1232
1233 void
slc_import(int def)1234 slc_import(int def)
1235 {
1236 if (NETROOM() > (int)sizeof(slc_import_val)) {
1237 if (def) {
1238 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def));
1239 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2);
1240 } else {
1241 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val));
1242 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2);
1243 }
1244 }
1245 /*@*/ else printf("slc_import: not enough room\n");
1246 }
1247
1248 void
slc_export(void)1249 slc_export(void)
1250 {
1251 struct spc *spcp;
1252
1253 TerminalDefaultChars();
1254
1255 slc_start_reply();
1256 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1257 if (spcp->mylevel != SLC_NOSUPPORT) {
1258 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1259 spcp->flags = SLC_NOSUPPORT;
1260 else
1261 spcp->flags = spcp->mylevel;
1262 if (spcp->valp)
1263 spcp->val = *spcp->valp;
1264 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1265 }
1266 }
1267 slc_end_reply();
1268 (void)slc_update();
1269 setconnmode(1); /* Make sure the character values are set */
1270 }
1271
1272 void
slc(unsigned char * cp,int len)1273 slc(unsigned char *cp, int len)
1274 {
1275 struct spc *spcp;
1276 int func,level;
1277
1278 slc_start_reply();
1279
1280 for (; len >= 3; len -=3, cp +=3) {
1281
1282 func = cp[SLC_FUNC];
1283
1284 if (func == 0) {
1285 /*
1286 * Client side: always ignore 0 function.
1287 */
1288 continue;
1289 }
1290 if (func > NSLC) {
1291 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT)
1292 slc_add_reply(func, SLC_NOSUPPORT, 0);
1293 continue;
1294 }
1295
1296 spcp = &spc_data[func];
1297
1298 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK);
1299
1300 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) &&
1301 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) {
1302 continue;
1303 }
1304
1305 if (level == (SLC_DEFAULT|SLC_ACK)) {
1306 /*
1307 * This is an error condition, the SLC_ACK
1308 * bit should never be set for the SLC_DEFAULT
1309 * level. Our best guess to recover is to
1310 * ignore the SLC_ACK bit.
1311 */
1312 cp[SLC_FLAGS] &= ~SLC_ACK;
1313 }
1314
1315 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) {
1316 spcp->val = (cc_t)cp[SLC_VALUE];
1317 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */
1318 continue;
1319 }
1320
1321 level &= ~SLC_ACK;
1322
1323 if (level <= (spcp->mylevel&SLC_LEVELBITS)) {
1324 spcp->flags = cp[SLC_FLAGS]|SLC_ACK;
1325 spcp->val = (cc_t)cp[SLC_VALUE];
1326 }
1327 if (level == SLC_DEFAULT) {
1328 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT)
1329 spcp->flags = spcp->mylevel;
1330 else
1331 spcp->flags = SLC_NOSUPPORT;
1332 }
1333 slc_add_reply(func, spcp->flags, spcp->val);
1334 }
1335 slc_end_reply();
1336 if (slc_update())
1337 setconnmode(1); /* set the new character values */
1338 }
1339
1340 void
slc_check(void)1341 slc_check(void)
1342 {
1343 struct spc *spcp;
1344
1345 slc_start_reply();
1346 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1347 if (spcp->valp && spcp->val != *spcp->valp) {
1348 spcp->val = *spcp->valp;
1349 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1350 spcp->flags = SLC_NOSUPPORT;
1351 else
1352 spcp->flags = spcp->mylevel;
1353 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1354 }
1355 }
1356 slc_end_reply();
1357 setconnmode(1);
1358 }
1359
1360 unsigned char slc_reply[128];
1361 unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
1362 unsigned char *slc_replyp;
1363
1364 void
slc_start_reply(void)1365 slc_start_reply(void)
1366 {
1367 slc_replyp = slc_reply;
1368 *slc_replyp++ = IAC;
1369 *slc_replyp++ = SB;
1370 *slc_replyp++ = TELOPT_LINEMODE;
1371 *slc_replyp++ = LM_SLC;
1372 }
1373
1374 void
slc_add_reply(unsigned char func,unsigned char flags,cc_t value)1375 slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
1376 {
1377 /* A sequence of up to 6 bytes my be written for this member of the SLC
1378 * suboption list by this function. The end of negotiation command,
1379 * which is written by slc_end_reply(), will require 2 additional
1380 * bytes. Do not proceed unless there is sufficient space for these
1381 * items.
1382 */
1383 if (&slc_replyp[6+2] > slc_reply_eom)
1384 return;
1385 if ((*slc_replyp++ = func) == IAC)
1386 *slc_replyp++ = IAC;
1387 if ((*slc_replyp++ = flags) == IAC)
1388 *slc_replyp++ = IAC;
1389 if ((*slc_replyp++ = (unsigned char)value) == IAC)
1390 *slc_replyp++ = IAC;
1391 }
1392
1393 void
slc_end_reply(void)1394 slc_end_reply(void)
1395 {
1396 int len;
1397
1398 /* The end of negotiation command requires 2 bytes. */
1399 if (&slc_replyp[2] > slc_reply_eom)
1400 return;
1401 *slc_replyp++ = IAC;
1402 *slc_replyp++ = SE;
1403 len = slc_replyp - slc_reply;
1404 if (len <= 6)
1405 return;
1406 if (NETROOM() > len) {
1407 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply);
1408 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2);
1409 }
1410 /*@*/else printf("slc_end_reply: not enough room\n");
1411 }
1412
1413 int
slc_update(void)1414 slc_update(void)
1415 {
1416 struct spc *spcp;
1417 int need_update = 0;
1418
1419 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1420 if (!(spcp->flags&SLC_ACK))
1421 continue;
1422 spcp->flags &= ~SLC_ACK;
1423 if (spcp->valp && (*spcp->valp != spcp->val)) {
1424 *spcp->valp = spcp->val;
1425 need_update = 1;
1426 }
1427 }
1428 return(need_update);
1429 }
1430
1431 #ifdef OLD_ENVIRON
1432 # ifdef ENV_HACK
1433 /*
1434 * Earlier version of telnet/telnetd from the BSD code had
1435 * the definitions of VALUE and VAR reversed. To ensure
1436 * maximum interoperability, we assume that the server is
1437 * an older BSD server, until proven otherwise. The newer
1438 * BSD servers should be able to handle either definition,
1439 * so it is better to use the wrong values if we don't
1440 * know what type of server it is.
1441 */
1442 int env_auto = 1;
1443 int old_env_var = OLD_ENV_VAR;
1444 int old_env_value = OLD_ENV_VALUE;
1445 # else
1446 # define old_env_var OLD_ENV_VAR
1447 # define old_env_value OLD_ENV_VALUE
1448 # endif
1449 #endif
1450
1451 void
env_opt(unsigned char * buf,int len)1452 env_opt(unsigned char *buf, int len)
1453 {
1454 unsigned char *ep = 0, *epc = 0;
1455 int i;
1456
1457 switch(buf[0]&0xff) {
1458 case TELQUAL_SEND:
1459 env_opt_start();
1460 if (len == 1) {
1461 env_opt_add(NULL);
1462 } else for (i = 1; i < len; i++) {
1463 switch (buf[i]&0xff) {
1464 #ifdef OLD_ENVIRON
1465 case OLD_ENV_VAR:
1466 # ifdef ENV_HACK
1467 if (telopt_environ == TELOPT_OLD_ENVIRON
1468 && env_auto) {
1469 /* Server has the same definitions */
1470 old_env_var = OLD_ENV_VAR;
1471 old_env_value = OLD_ENV_VALUE;
1472 }
1473 /* FALLTHROUGH */
1474 # endif
1475 case OLD_ENV_VALUE:
1476 /*
1477 * Although OLD_ENV_VALUE is not legal, we will
1478 * still recognize it, just in case it is an
1479 * old server that has VAR & VALUE mixed up...
1480 */
1481 /* FALLTHROUGH */
1482 #else
1483 case NEW_ENV_VAR:
1484 #endif
1485 case ENV_USERVAR:
1486 if (ep) {
1487 *epc = 0;
1488 env_opt_add(ep);
1489 }
1490 ep = epc = &buf[i+1];
1491 break;
1492 case ENV_ESC:
1493 i++;
1494 /*FALLTHROUGH*/
1495 default:
1496 if (epc)
1497 *epc++ = buf[i];
1498 break;
1499 }
1500 }
1501 if (ep) {
1502 *epc = 0;
1503 env_opt_add(ep);
1504 }
1505 env_opt_end(1);
1506 break;
1507
1508 case TELQUAL_IS:
1509 case TELQUAL_INFO:
1510 /* Ignore for now. We shouldn't get it anyway. */
1511 break;
1512
1513 default:
1514 break;
1515 }
1516 }
1517
1518 #define OPT_REPLY_SIZE (2 * SUBBUFSIZE)
1519 unsigned char *opt_reply = NULL;
1520 unsigned char *opt_replyp;
1521 unsigned char *opt_replyend;
1522
1523 void
env_opt_start(void)1524 env_opt_start(void)
1525 {
1526 if (opt_reply)
1527 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE);
1528 else
1529 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE);
1530 if (opt_reply == NULL) {
1531 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n");
1532 opt_reply = opt_replyp = opt_replyend = NULL;
1533 return;
1534 }
1535 opt_replyp = opt_reply;
1536 opt_replyend = opt_reply + OPT_REPLY_SIZE;
1537 *opt_replyp++ = IAC;
1538 *opt_replyp++ = SB;
1539 *opt_replyp++ = telopt_environ;
1540 *opt_replyp++ = TELQUAL_IS;
1541 }
1542
1543 void
env_opt_start_info(void)1544 env_opt_start_info(void)
1545 {
1546 env_opt_start();
1547 if (opt_replyp)
1548 opt_replyp[-1] = TELQUAL_INFO;
1549 }
1550
1551 void
env_opt_add(unsigned char * ep)1552 env_opt_add(unsigned char *ep)
1553 {
1554 unsigned char *vp, c;
1555
1556 if (opt_reply == NULL) /*XXX*/
1557 return; /*XXX*/
1558
1559 if (ep == NULL || *ep == '\0') {
1560 /* Send user defined variables first. */
1561 env_default(1, 0);
1562 while ((ep = env_default(0, 0)))
1563 env_opt_add(ep);
1564
1565 /* Now add the list of well know variables. */
1566 env_default(1, 1);
1567 while ((ep = env_default(0, 1)))
1568 env_opt_add(ep);
1569 return;
1570 }
1571 vp = env_getvalue(ep);
1572 if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
1573 2 * strlen((char *)ep) + 6 > opt_replyend)
1574 {
1575 int len;
1576 opt_replyend += OPT_REPLY_SIZE;
1577 len = opt_replyend - opt_reply;
1578 opt_reply = (unsigned char *)realloc(opt_reply, len);
1579 if (opt_reply == NULL) {
1580 /*@*/ printf("env_opt_add: realloc() failed!!!\n");
1581 opt_reply = opt_replyp = opt_replyend = NULL;
1582 return;
1583 }
1584 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp);
1585 opt_replyend = opt_reply + len;
1586 }
1587 if (opt_welldefined(ep))
1588 #ifdef OLD_ENVIRON
1589 if (telopt_environ == TELOPT_OLD_ENVIRON)
1590 *opt_replyp++ = old_env_var;
1591 else
1592 #endif
1593 *opt_replyp++ = NEW_ENV_VAR;
1594 else
1595 *opt_replyp++ = ENV_USERVAR;
1596 for (;;) {
1597 while ((c = *ep++)) {
1598 if (opt_replyp + (2 + 2) > opt_replyend)
1599 return;
1600 switch(c&0xff) {
1601 case IAC:
1602 *opt_replyp++ = IAC;
1603 break;
1604 case NEW_ENV_VAR:
1605 case NEW_ENV_VALUE:
1606 case ENV_ESC:
1607 case ENV_USERVAR:
1608 *opt_replyp++ = ENV_ESC;
1609 break;
1610 }
1611 *opt_replyp++ = c;
1612 }
1613 if ((ep = vp)) {
1614 if (opt_replyp + (1 + 2 + 2) > opt_replyend)
1615 return;
1616 #ifdef OLD_ENVIRON
1617 if (telopt_environ == TELOPT_OLD_ENVIRON)
1618 *opt_replyp++ = old_env_value;
1619 else
1620 #endif
1621 *opt_replyp++ = NEW_ENV_VALUE;
1622 vp = NULL;
1623 } else
1624 break;
1625 }
1626 }
1627
1628 int
opt_welldefined(const char * ep)1629 opt_welldefined(const char *ep)
1630 {
1631 if ((strcmp(ep, "USER") == 0) ||
1632 (strcmp(ep, "DISPLAY") == 0) ||
1633 (strcmp(ep, "PRINTER") == 0) ||
1634 (strcmp(ep, "SYSTEMTYPE") == 0) ||
1635 (strcmp(ep, "JOB") == 0) ||
1636 (strcmp(ep, "ACCT") == 0))
1637 return(1);
1638 return(0);
1639 }
1640
1641 void
env_opt_end(int emptyok)1642 env_opt_end(int emptyok)
1643 {
1644 int len;
1645
1646 if (opt_replyp + 2 > opt_replyend)
1647 return;
1648 len = opt_replyp + 2 - opt_reply;
1649 if (emptyok || len > 6) {
1650 *opt_replyp++ = IAC;
1651 *opt_replyp++ = SE;
1652 if (NETROOM() > len) {
1653 ring_supply_data(&netoring, opt_reply, len);
1654 printsub('>', &opt_reply[2], len - 2);
1655 }
1656 /*@*/ else printf("slc_end_reply: not enough room\n");
1657 }
1658 if (opt_reply) {
1659 free(opt_reply);
1660 opt_reply = opt_replyp = opt_replyend = NULL;
1661 }
1662 }
1663
1664
1665
1666 int
telrcv(void)1667 telrcv(void)
1668 {
1669 int c;
1670 int scc;
1671 unsigned char *sbp;
1672 int count;
1673 int returnValue = 0;
1674
1675 scc = 0;
1676 count = 0;
1677 while (TTYROOM() > 2) {
1678 if (scc == 0) {
1679 if (count) {
1680 ring_consumed(&netiring, count);
1681 returnValue = 1;
1682 count = 0;
1683 }
1684 sbp = netiring.consume;
1685 scc = ring_full_consecutive(&netiring);
1686 if (scc == 0) {
1687 /* No more data coming in */
1688 break;
1689 }
1690 }
1691
1692 c = *sbp++ & 0xff, scc--; count++;
1693 #ifdef ENCRYPTION
1694 if (decrypt_input)
1695 c = (*decrypt_input)(c);
1696 #endif /* ENCRYPTION */
1697
1698 switch (telrcv_state) {
1699
1700 case TS_CR:
1701 telrcv_state = TS_DATA;
1702 if (c == '\0') {
1703 break; /* Ignore \0 after CR */
1704 }
1705 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) {
1706 TTYADD(c);
1707 break;
1708 }
1709 /* FALLTHROUGH */
1710
1711 case TS_DATA:
1712 if (c == IAC && telnetport >= 0) {
1713 telrcv_state = TS_IAC;
1714 break;
1715 }
1716 /*
1717 * The 'crmod' hack (see following) is needed
1718 * since we can't * set CRMOD on output only.
1719 * Machines like MULTICS like to send \r without
1720 * \n; since we must turn off CRMOD to get proper
1721 * input, the mapping is done here (sigh).
1722 */
1723 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) {
1724 if (scc > 0) {
1725 c = *sbp&0xff;
1726 #ifdef ENCRYPTION
1727 if (decrypt_input)
1728 c = (*decrypt_input)(c);
1729 #endif /* ENCRYPTION */
1730 if (c == 0) {
1731 sbp++, scc--; count++;
1732 /* a "true" CR */
1733 TTYADD('\r');
1734 } else if (my_want_state_is_dont(TELOPT_ECHO) &&
1735 (c == '\n')) {
1736 sbp++, scc--; count++;
1737 TTYADD('\n');
1738 } else {
1739 #ifdef ENCRYPTION
1740 if (decrypt_input)
1741 (*decrypt_input)(-1);
1742 #endif /* ENCRYPTION */
1743
1744 TTYADD('\r');
1745 if (crmod) {
1746 TTYADD('\n');
1747 }
1748 }
1749 } else {
1750 telrcv_state = TS_CR;
1751 TTYADD('\r');
1752 if (crmod) {
1753 TTYADD('\n');
1754 }
1755 }
1756 } else {
1757 TTYADD(c);
1758 }
1759 continue;
1760
1761 case TS_IAC:
1762 process_iac:
1763 switch (c) {
1764
1765 case WILL:
1766 telrcv_state = TS_WILL;
1767 continue;
1768
1769 case WONT:
1770 telrcv_state = TS_WONT;
1771 continue;
1772
1773 case DO:
1774 telrcv_state = TS_DO;
1775 continue;
1776
1777 case DONT:
1778 telrcv_state = TS_DONT;
1779 continue;
1780
1781 case DM:
1782 /*
1783 * We may have missed an urgent notification,
1784 * so make sure we flush whatever is in the
1785 * buffer currently.
1786 */
1787 printoption("RCVD", IAC, DM);
1788 SYNCHing = 1;
1789 (void) ttyflush(1);
1790 SYNCHing = stilloob();
1791 settimer(gotDM);
1792 break;
1793
1794 case SB:
1795 SB_CLEAR();
1796 telrcv_state = TS_SB;
1797 continue;
1798
1799 case IAC:
1800 TTYADD(IAC);
1801 break;
1802
1803 case NOP:
1804 case GA:
1805 default:
1806 printoption("RCVD", IAC, c);
1807 break;
1808 }
1809 telrcv_state = TS_DATA;
1810 continue;
1811
1812 case TS_WILL:
1813 printoption("RCVD", WILL, c);
1814 willoption(c);
1815 telrcv_state = TS_DATA;
1816 continue;
1817
1818 case TS_WONT:
1819 printoption("RCVD", WONT, c);
1820 wontoption(c);
1821 telrcv_state = TS_DATA;
1822 continue;
1823
1824 case TS_DO:
1825 printoption("RCVD", DO, c);
1826 dooption(c);
1827 if (c == TELOPT_NAWS) {
1828 sendnaws();
1829 } else if (c == TELOPT_LFLOW) {
1830 localflow = 1;
1831 setcommandmode();
1832 setconnmode(0);
1833 }
1834 telrcv_state = TS_DATA;
1835 continue;
1836
1837 case TS_DONT:
1838 printoption("RCVD", DONT, c);
1839 dontoption(c);
1840 flushline = 1;
1841 setconnmode(0); /* set new tty mode (maybe) */
1842 telrcv_state = TS_DATA;
1843 continue;
1844
1845 case TS_SB:
1846 if (c == IAC) {
1847 telrcv_state = TS_SE;
1848 } else {
1849 SB_ACCUM(c);
1850 }
1851 continue;
1852
1853 case TS_SE:
1854 if (c != SE) {
1855 if (c != IAC) {
1856 /*
1857 * This is an error. We only expect to get
1858 * "IAC IAC" or "IAC SE". Several things may
1859 * have happend. An IAC was not doubled, the
1860 * IAC SE was left off, or another option got
1861 * inserted into the suboption are all possibilities.
1862 * If we assume that the IAC was not doubled,
1863 * and really the IAC SE was left off, we could
1864 * get into an infinate loop here. So, instead,
1865 * we terminate the suboption, and process the
1866 * partial suboption if we can.
1867 */
1868 SB_ACCUM(IAC);
1869 SB_ACCUM(c);
1870 subpointer -= 2;
1871 SB_TERM();
1872
1873 printoption("In SUBOPTION processing, RCVD", IAC, c);
1874 suboption(); /* handle sub-option */
1875 telrcv_state = TS_IAC;
1876 goto process_iac;
1877 }
1878 SB_ACCUM(c);
1879 telrcv_state = TS_SB;
1880 } else {
1881 SB_ACCUM(IAC);
1882 SB_ACCUM(SE);
1883 subpointer -= 2;
1884 SB_TERM();
1885 suboption(); /* handle sub-option */
1886 telrcv_state = TS_DATA;
1887 }
1888 }
1889 }
1890 if (count)
1891 ring_consumed(&netiring, count);
1892 return returnValue||count;
1893 }
1894
1895 static int bol = 1, local = 0;
1896
1897 int
rlogin_susp(void)1898 rlogin_susp(void)
1899 {
1900 if (local) {
1901 local = 0;
1902 bol = 1;
1903 command(0, "z\n", 2);
1904 return(1);
1905 }
1906 return(0);
1907 }
1908
1909 static int
telsnd(void)1910 telsnd(void)
1911 {
1912 int tcc;
1913 int count;
1914 int returnValue = 0;
1915 unsigned char *tbp;
1916
1917 tcc = 0;
1918 count = 0;
1919 while (NETROOM() > 2) {
1920 int sc;
1921 int c;
1922
1923 if (tcc == 0) {
1924 if (count) {
1925 ring_consumed(&ttyiring, count);
1926 returnValue = 1;
1927 count = 0;
1928 }
1929 tbp = ttyiring.consume;
1930 tcc = ring_full_consecutive(&ttyiring);
1931 if (tcc == 0) {
1932 break;
1933 }
1934 }
1935 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
1936 if (rlogin != _POSIX_VDISABLE) {
1937 if (bol) {
1938 bol = 0;
1939 if (sc == rlogin) {
1940 local = 1;
1941 continue;
1942 }
1943 } else if (local) {
1944 local = 0;
1945 if (sc == '.' || c == termEofChar) {
1946 bol = 1;
1947 command(0, "close\n", 6);
1948 continue;
1949 }
1950 if (sc == termSuspChar) {
1951 bol = 1;
1952 command(0, "z\n", 2);
1953 continue;
1954 }
1955 if (sc == escape) {
1956 command(0, tbp, tcc);
1957 bol = 1;
1958 count += tcc;
1959 tcc = 0;
1960 flushline = 1;
1961 break;
1962 }
1963 if (sc != rlogin) {
1964 ++tcc;
1965 --tbp;
1966 --count;
1967 c = sc = rlogin;
1968 }
1969 }
1970 if ((sc == '\n') || (sc == '\r'))
1971 bol = 1;
1972 } else if (escape != _POSIX_VDISABLE && sc == escape) {
1973 /*
1974 * Double escape is a pass through of a single escape character.
1975 */
1976 if (tcc && strip(*tbp) == escape) {
1977 tbp++;
1978 tcc--;
1979 count++;
1980 bol = 0;
1981 } else {
1982 command(0, (char *)tbp, tcc);
1983 bol = 1;
1984 count += tcc;
1985 tcc = 0;
1986 flushline = 1;
1987 break;
1988 }
1989 } else
1990 bol = 0;
1991 #ifdef KLUDGELINEMODE
1992 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
1993 if (tcc > 0 && strip(*tbp) == echoc) {
1994 tcc--; tbp++; count++;
1995 } else {
1996 dontlecho = !dontlecho;
1997 settimer(echotoggle);
1998 setconnmode(0);
1999 flushline = 1;
2000 break;
2001 }
2002 }
2003 #endif
2004 if (MODE_LOCAL_CHARS(globalmode)) {
2005 if (TerminalSpecialChars(sc) == 0) {
2006 bol = 1;
2007 break;
2008 }
2009 }
2010 if (my_want_state_is_wont(TELOPT_BINARY)) {
2011 switch (c) {
2012 case '\n':
2013 /*
2014 * If we are in CRMOD mode (\r ==> \n)
2015 * on our local machine, then probably
2016 * a newline (unix) is CRLF (TELNET).
2017 */
2018 if (MODE_LOCAL_CHARS(globalmode)) {
2019 NETADD('\r');
2020 }
2021 NETADD('\n');
2022 bol = flushline = 1;
2023 break;
2024 case '\r':
2025 if (!crlf) {
2026 NET2ADD('\r', '\0');
2027 } else {
2028 NET2ADD('\r', '\n');
2029 }
2030 bol = flushline = 1;
2031 break;
2032 case IAC:
2033 NET2ADD(IAC, IAC);
2034 break;
2035 default:
2036 NETADD(c);
2037 break;
2038 }
2039 } else if (c == IAC) {
2040 NET2ADD(IAC, IAC);
2041 } else {
2042 NETADD(c);
2043 }
2044 }
2045 if (count)
2046 ring_consumed(&ttyiring, count);
2047 return returnValue||count; /* Non-zero if we did anything */
2048 }
2049
2050 /*
2051 * Scheduler()
2052 *
2053 * Try to do something.
2054 *
2055 * If we do something useful, return 1; else return 0.
2056 *
2057 */
2058
2059 static int
Scheduler(int block)2060 Scheduler(int block)
2061 {
2062 /* One wants to be a bit careful about setting returnValue
2063 * to one, since a one implies we did some useful work,
2064 * and therefore probably won't be called to block next
2065 */
2066 int returnValue;
2067 int netin, netout, netex, ttyin, ttyout;
2068
2069 /* Decide which rings should be processed */
2070
2071 netout = ring_full_count(&netoring) &&
2072 (flushline ||
2073 (my_want_state_is_wont(TELOPT_LINEMODE)
2074 #ifdef KLUDGELINEMODE
2075 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
2076 #endif
2077 ) ||
2078 my_want_state_is_will(TELOPT_BINARY));
2079 ttyout = ring_full_count(&ttyoring);
2080
2081 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0);
2082
2083 netin = !ISend && ring_empty_count(&netiring);
2084
2085 netex = !SYNCHing;
2086
2087 /* Call to system code to process rings */
2088
2089 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
2090
2091 /* Now, look at the input rings, looking for work to do. */
2092
2093 if (ring_full_count(&ttyiring)) {
2094 returnValue |= telsnd();
2095 }
2096
2097 if (ring_full_count(&netiring)) {
2098 returnValue |= telrcv();
2099 }
2100 return returnValue;
2101 }
2102
2103 #ifdef AUTHENTICATION
2104 #define __unusedhere
2105 #else
2106 #define __unusedhere __unused
2107 #endif
2108 /*
2109 * Select from tty and network...
2110 */
2111 void
telnet(char * user __unusedhere)2112 telnet(char *user __unusedhere)
2113 {
2114 sys_telnet_init();
2115
2116 #ifdef AUTHENTICATION
2117 #ifdef ENCRYPTION
2118 {
2119 static char local_host[256] = { 0 };
2120
2121 if (!local_host[0]) {
2122 gethostname(local_host, sizeof(local_host));
2123 local_host[sizeof(local_host)-1] = 0;
2124 }
2125 auth_encrypt_init(local_host, hostname, "TELNET", 0);
2126 auth_encrypt_user(user);
2127 }
2128 #endif
2129 #endif
2130 if (telnetport > 0) {
2131 #ifdef AUTHENTICATION
2132 if (autologin)
2133 send_will(TELOPT_AUTHENTICATION, 1);
2134 #endif
2135 #ifdef ENCRYPTION
2136 send_do(TELOPT_ENCRYPT, 1);
2137 send_will(TELOPT_ENCRYPT, 1);
2138 #endif /* ENCRYPTION */
2139 send_do(TELOPT_SGA, 1);
2140 send_will(TELOPT_TTYPE, 1);
2141 send_will(TELOPT_NAWS, 1);
2142 send_will(TELOPT_TSPEED, 1);
2143 send_will(TELOPT_LFLOW, 1);
2144 send_will(TELOPT_LINEMODE, 1);
2145 send_will(TELOPT_NEW_ENVIRON, 1);
2146 send_do(TELOPT_STATUS, 1);
2147 if (env_getvalue("DISPLAY"))
2148 send_will(TELOPT_XDISPLOC, 1);
2149 if (eight)
2150 tel_enter_binary(eight);
2151 }
2152
2153 for (;;) {
2154 int schedValue;
2155
2156 while ((schedValue = Scheduler(0)) != 0) {
2157 if (schedValue == -1) {
2158 setcommandmode();
2159 return;
2160 }
2161 }
2162
2163 if (Scheduler(1) == -1) {
2164 setcommandmode();
2165 return;
2166 }
2167 }
2168 }
2169
2170 #if 0 /* XXX - this not being in is a bug */
2171 /*
2172 * nextitem()
2173 *
2174 * Return the address of the next "item" in the TELNET data
2175 * stream. This will be the address of the next character if
2176 * the current address is a user data character, or it will
2177 * be the address of the character following the TELNET command
2178 * if the current address is a TELNET IAC ("I Am a Command")
2179 * character.
2180 */
2181
2182 static char *
2183 nextitem(char *current)
2184 {
2185 if ((*current&0xff) != IAC) {
2186 return current+1;
2187 }
2188 switch (*(current+1)&0xff) {
2189 case DO:
2190 case DONT:
2191 case WILL:
2192 case WONT:
2193 return current+3;
2194 case SB: /* loop forever looking for the SE */
2195 {
2196 char *look = current+2;
2197
2198 for (;;) {
2199 if ((*look++&0xff) == IAC) {
2200 if ((*look++&0xff) == SE) {
2201 return look;
2202 }
2203 }
2204 }
2205 }
2206 default:
2207 return current+2;
2208 }
2209 }
2210 #endif /* 0 */
2211
2212 /*
2213 * netclear()
2214 *
2215 * We are about to do a TELNET SYNCH operation. Clear
2216 * the path to the network.
2217 *
2218 * Things are a bit tricky since we may have sent the first
2219 * byte or so of a previous TELNET command into the network.
2220 * So, we have to scan the network buffer from the beginning
2221 * until we are up to where we want to be.
2222 *
2223 * A side effect of what we do, just to keep things
2224 * simple, is to clear the urgent data pointer. The principal
2225 * caller should be setting the urgent data pointer AFTER calling
2226 * us in any case.
2227 */
2228
2229 static void
netclear(void)2230 netclear(void)
2231 {
2232 /* Deleted */
2233 }
2234
2235 /*
2236 * These routines add various telnet commands to the data stream.
2237 */
2238
2239 static void
doflush(void)2240 doflush(void)
2241 {
2242 NET2ADD(IAC, DO);
2243 NETADD(TELOPT_TM);
2244 flushline = 1;
2245 flushout = 1;
2246 (void) ttyflush(1); /* Flush/drop output */
2247 /* do printoption AFTER flush, otherwise the output gets tossed... */
2248 printoption("SENT", DO, TELOPT_TM);
2249 }
2250
2251 void
xmitAO(void)2252 xmitAO(void)
2253 {
2254 NET2ADD(IAC, AO);
2255 printoption("SENT", IAC, AO);
2256 if (autoflush) {
2257 doflush();
2258 }
2259 }
2260
2261 void
xmitEL(void)2262 xmitEL(void)
2263 {
2264 NET2ADD(IAC, EL);
2265 printoption("SENT", IAC, EL);
2266 }
2267
2268 void
xmitEC(void)2269 xmitEC(void)
2270 {
2271 NET2ADD(IAC, EC);
2272 printoption("SENT", IAC, EC);
2273 }
2274
2275 int
dosynch(char * ch __unused)2276 dosynch(char *ch __unused)
2277 {
2278 netclear(); /* clear the path to the network */
2279 NETADD(IAC);
2280 setneturg();
2281 NETADD(DM);
2282 printoption("SENT", IAC, DM);
2283 return 1;
2284 }
2285
2286 int want_status_response = 0;
2287
2288 int
get_status(char * ch __unused)2289 get_status(char *ch __unused)
2290 {
2291 unsigned char tmp[16];
2292 unsigned char *cp;
2293
2294 if (my_want_state_is_dont(TELOPT_STATUS)) {
2295 printf("Remote side does not support STATUS option\n");
2296 return 0;
2297 }
2298 cp = tmp;
2299
2300 *cp++ = IAC;
2301 *cp++ = SB;
2302 *cp++ = TELOPT_STATUS;
2303 *cp++ = TELQUAL_SEND;
2304 *cp++ = IAC;
2305 *cp++ = SE;
2306 if (NETROOM() >= cp - tmp) {
2307 ring_supply_data(&netoring, tmp, cp-tmp);
2308 printsub('>', tmp+2, cp - tmp - 2);
2309 }
2310 ++want_status_response;
2311 return 1;
2312 }
2313
2314 void
intp(void)2315 intp(void)
2316 {
2317 NET2ADD(IAC, IP);
2318 printoption("SENT", IAC, IP);
2319 flushline = 1;
2320 if (autoflush) {
2321 doflush();
2322 }
2323 if (autosynch) {
2324 dosynch(NULL);
2325 }
2326 }
2327
2328 void
sendbrk(void)2329 sendbrk(void)
2330 {
2331 NET2ADD(IAC, BREAK);
2332 printoption("SENT", IAC, BREAK);
2333 flushline = 1;
2334 if (autoflush) {
2335 doflush();
2336 }
2337 if (autosynch) {
2338 dosynch(NULL);
2339 }
2340 }
2341
2342 void
sendabort(void)2343 sendabort(void)
2344 {
2345 NET2ADD(IAC, ABORT);
2346 printoption("SENT", IAC, ABORT);
2347 flushline = 1;
2348 if (autoflush) {
2349 doflush();
2350 }
2351 if (autosynch) {
2352 dosynch(NULL);
2353 }
2354 }
2355
2356 void
sendsusp(void)2357 sendsusp(void)
2358 {
2359 NET2ADD(IAC, SUSP);
2360 printoption("SENT", IAC, SUSP);
2361 flushline = 1;
2362 if (autoflush) {
2363 doflush();
2364 }
2365 if (autosynch) {
2366 dosynch(NULL);
2367 }
2368 }
2369
2370 void
sendeof(void)2371 sendeof(void)
2372 {
2373 NET2ADD(IAC, xEOF);
2374 printoption("SENT", IAC, xEOF);
2375 }
2376
2377 void
sendayt(void)2378 sendayt(void)
2379 {
2380 NET2ADD(IAC, AYT);
2381 printoption("SENT", IAC, AYT);
2382 }
2383
2384 /*
2385 * Send a window size update to the remote system.
2386 */
2387
2388 void
sendnaws(void)2389 sendnaws(void)
2390 {
2391 long rows, cols;
2392 unsigned char tmp[16];
2393 unsigned char *cp;
2394
2395 if (my_state_is_wont(TELOPT_NAWS))
2396 return;
2397
2398 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \
2399 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; }
2400
2401 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */
2402 return;
2403 }
2404
2405 cp = tmp;
2406
2407 *cp++ = IAC;
2408 *cp++ = SB;
2409 *cp++ = TELOPT_NAWS;
2410 PUTSHORT(cp, cols);
2411 PUTSHORT(cp, rows);
2412 *cp++ = IAC;
2413 *cp++ = SE;
2414 if (NETROOM() >= cp - tmp) {
2415 ring_supply_data(&netoring, tmp, cp-tmp);
2416 printsub('>', tmp+2, cp - tmp - 2);
2417 }
2418 }
2419
2420 void
tel_enter_binary(int rw)2421 tel_enter_binary(int rw)
2422 {
2423 if (rw&1)
2424 send_do(TELOPT_BINARY, 1);
2425 if (rw&2)
2426 send_will(TELOPT_BINARY, 1);
2427 }
2428
2429 void
tel_leave_binary(int rw)2430 tel_leave_binary(int rw)
2431 {
2432 if (rw&1)
2433 send_dont(TELOPT_BINARY, 1);
2434 if (rw&2)
2435 send_wont(TELOPT_BINARY, 1);
2436 }
2437