1 /** $MirOS: src/usr.bin/telnet/telnet.c,v 1.3 2005/04/26 15:51:32 tg Exp $ */
2 /* $OpenBSD: telnet.c,v 1.19 2005/02/27 15:46:42 otto Exp $ */
3 /* $NetBSD: telnet.c,v 1.7 1996/02/28 21:04:15 thorpej Exp $ */
4
5 /*
6 * Copyright (c) 1988, 1990, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. 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 "telnet_locl.h"
35 #include <curses.h>
36 #include <term.h>
37
38 __RCSID("$MirOS: src/usr.bin/telnet/telnet.c,v 1.3 2005/04/26 15:51:32 tg Exp $");
39
40 #define strip(x) (eight ? (x) : ((x) & 0x7f))
41
42 static unsigned char subbuffer[SUBBUFSIZE],
43 *subpointer, *subend; /* buffer for sub-options */
44 #define SB_CLEAR() subpointer = subbuffer;
45 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
46 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
47 *subpointer++ = (c); \
48 }
49
50 #define SB_GET() ((*subpointer++)&0xff)
51 #define SB_PEEK() ((*subpointer)&0xff)
52 #define SB_EOF() (subpointer >= subend)
53 #define SB_LEN() (subend - subpointer)
54
55 char options[256]; /* The combined options */
56 char do_dont_resp[256];
57 char will_wont_resp[256];
58
59 int
60 eight = 3,
61 binary = 0,
62 autologin = 0, /* Autologin anyone? */
63 skiprc = 0,
64 connected,
65 showoptions,
66 In3270, /* Are we in 3270 mode? */
67 ISend, /* trying to send network data in */
68 debug = 0,
69 crmod,
70 netdata, /* Print out network data flow */
71 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
72 #if defined(TN3270)
73 noasynchtty = 0,/* User specified "-noasynch" on command line */
74 noasynchnet = 0,/* User specified "-noasynch" on command line */
75 askedSGA = 0, /* We have talked about suppress go ahead */
76 #endif /* defined(TN3270) */
77 telnetport,
78 wantencryption = 0,
79 SYNCHing, /* we are in TELNET SYNCH mode */
80 flushout, /* flush output */
81 autoflush = 0, /* flush output when interrupting? */
82 autosynch, /* send interrupt characters with SYNCH? */
83 localflow, /* we handle flow control locally */
84 restartany, /* if flow control enabled, restart on any character */
85 localchars, /* we recognize interrupt/quit */
86 donelclchars, /* the user has set "localchars" */
87 donebinarytoggle, /* the user has put us in binary */
88 dontlecho, /* do we suppress local echoing right now? */
89 globalmode,
90 clienteof = 0;
91
92 char *prompt = 0;
93
94 int scheduler_lockout_tty = 0;
95
96 cc_t escape;
97 cc_t rlogin;
98 #ifdef KLUDGELINEMODE
99 cc_t echoc;
100 #endif
101
102 /*
103 * Telnet receiver states for fsm
104 */
105 #define TS_DATA 0
106 #define TS_IAC 1
107 #define TS_WILL 2
108 #define TS_WONT 3
109 #define TS_DO 4
110 #define TS_DONT 5
111 #define TS_CR 6
112 #define TS_SB 7 /* sub-option collection */
113 #define TS_SE 8 /* looking for sub-option end */
114
115 static int telrcv_state;
116 #ifdef OLD_ENVIRON
117 unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
118 #else
119 # define telopt_environ TELOPT_NEW_ENVIRON
120 #endif
121
122 jmp_buf toplevel = { 0 };
123 jmp_buf peerdied;
124
125 int flushline;
126 int linemode;
127
128 #ifdef KLUDGELINEMODE
129 int kludgelinemode = 1;
130 #endif
131
132 /*
133 * The following are some clocks used to decide how to interpret
134 * the relationship between various variables.
135 */
136
137 Clocks clocks;
138
139
140 /*
141 * Initialize telnet environment.
142 */
143
144 void
init_telnet()145 init_telnet()
146 {
147 env_init();
148
149 SB_CLEAR();
150 memset((char *)options, 0, sizeof options);
151
152 connected = In3270 = ISend = localflow = donebinarytoggle = 0;
153 #if defined(AUTHENTICATION) || defined(ENCRYPTION)
154 auth_encrypt_connect(connected);
155 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */
156 restartany = -1;
157
158 SYNCHing = 0;
159
160 /* Don't change NetTrace */
161
162 escape = CONTROL(']');
163 rlogin = _POSIX_VDISABLE;
164 #ifdef KLUDGELINEMODE
165 echoc = CONTROL('E');
166 #endif
167
168 flushline = 1;
169 telrcv_state = TS_DATA;
170 }
171
172
173 /*
174 * These routines are in charge of sending option negotiations
175 * to the other side.
176 *
177 * The basic idea is that we send the negotiation if either side
178 * is in disagreement as to what the current state should be.
179 */
180
181 void
send_do(c,init)182 send_do(c, init)
183 int c, init;
184 {
185 if (init) {
186 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
187 my_want_state_is_do(c))
188 return;
189 set_my_want_state_do(c);
190 do_dont_resp[c]++;
191 }
192 NET2ADD(IAC, DO);
193 NETADD(c);
194 printoption("SENT",DO, c);
195 }
196
197 void
send_dont(c,init)198 send_dont(c, init)
199 int c, init;
200 {
201 if (init) {
202 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
203 my_want_state_is_dont(c))
204 return;
205 set_my_want_state_dont(c);
206 do_dont_resp[c]++;
207 }
208 NET2ADD(IAC, DONT);
209 NETADD(c);
210 printoption("SENT", DONT, c);
211 }
212
213 void
send_will(c,init)214 send_will(c, init)
215 int c, init;
216 {
217 if (init) {
218 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
219 my_want_state_is_will(c))
220 return;
221 set_my_want_state_will(c);
222 will_wont_resp[c]++;
223 }
224 NET2ADD(IAC, WILL);
225 NETADD(c);
226 printoption("SENT", WILL, c);
227 }
228
229 void
send_wont(c,init)230 send_wont(c, init)
231 int c, init;
232 {
233 if (init) {
234 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
235 my_want_state_is_wont(c))
236 return;
237 set_my_want_state_wont(c);
238 will_wont_resp[c]++;
239 }
240 NET2ADD(IAC, WONT);
241 NETADD(c);
242 printoption("SENT", WONT, c);
243 }
244
245
246 void
willoption(option)247 willoption(option)
248 int option;
249 {
250 int new_state_ok = 0;
251
252 if (do_dont_resp[option]) {
253 --do_dont_resp[option];
254 if (do_dont_resp[option] && my_state_is_do(option))
255 --do_dont_resp[option];
256 }
257
258 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
259
260 switch (option) {
261
262 case TELOPT_ECHO:
263 # if defined(TN3270)
264 /*
265 * The following is a pain in the rear-end.
266 * Various IBM servers (some versions of Wiscnet,
267 * possibly Fibronics/Spartacus, and who knows who
268 * else) will NOT allow us to send "DO SGA" too early
269 * in the setup proceedings. On the other hand,
270 * 4.2 servers (telnetd) won't set SGA correctly.
271 * So, we are stuck. Empirically (but, based on
272 * a VERY small sample), the IBM servers don't send
273 * out anything about ECHO, so we postpone our sending
274 * "DO SGA" until we see "WILL ECHO" (which 4.2 servers
275 * DO send).
276 */
277 {
278 if (askedSGA == 0) {
279 askedSGA = 1;
280 if (my_want_state_is_dont(TELOPT_SGA))
281 send_do(TELOPT_SGA, 1);
282 }
283 }
284 /* Fall through */
285 case TELOPT_EOR:
286 #endif /* defined(TN3270) */
287 case TELOPT_BINARY:
288 case TELOPT_SGA:
289 settimer(modenegotiated);
290 /* FALL THROUGH */
291 case TELOPT_STATUS:
292 #if defined(AUTHENTICATION)
293 case TELOPT_AUTHENTICATION:
294 #endif
295 #if defined(ENCRYPTION)
296 case TELOPT_ENCRYPT:
297 #endif
298 new_state_ok = 1;
299 break;
300
301 case TELOPT_TM:
302 if (flushout)
303 flushout = 0;
304 /*
305 * Special case for TM. If we get back a WILL,
306 * pretend we got back a WONT.
307 */
308 set_my_want_state_dont(option);
309 set_my_state_dont(option);
310 return; /* Never reply to TM will's/wont's */
311
312 case TELOPT_LINEMODE:
313 default:
314 break;
315 }
316
317 if (new_state_ok) {
318 set_my_want_state_do(option);
319 send_do(option, 0);
320 setconnmode(0); /* possibly set new tty mode */
321 } else {
322 do_dont_resp[option]++;
323 send_dont(option, 0);
324 }
325 }
326 set_my_state_do(option);
327 #if defined(ENCRYPTION)
328 if (option == TELOPT_ENCRYPT)
329 encrypt_send_support();
330 #endif
331
332 }
333
334 void
wontoption(option)335 wontoption(option)
336 int option;
337 {
338 if (do_dont_resp[option]) {
339 --do_dont_resp[option];
340 if (do_dont_resp[option] && my_state_is_dont(option))
341 --do_dont_resp[option];
342 }
343
344 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
345
346 switch (option) {
347
348 #ifdef KLUDGELINEMODE
349 case TELOPT_SGA:
350 if (!kludgelinemode)
351 break;
352 /* FALL THROUGH */
353 #endif
354 case TELOPT_ECHO:
355 settimer(modenegotiated);
356 break;
357
358 case TELOPT_TM:
359 if (flushout)
360 flushout = 0;
361 set_my_want_state_dont(option);
362 set_my_state_dont(option);
363 return; /* Never reply to TM will's/wont's */
364
365 #ifdef ENCRYPTION
366 case TELOPT_ENCRYPT:
367 encrypt_not();
368 break;
369 #endif
370 default:
371 break;
372 }
373 set_my_want_state_dont(option);
374 if (my_state_is_do(option))
375 send_dont(option, 0);
376 setconnmode(0); /* Set new tty mode */
377 } else if (option == TELOPT_TM) {
378 /*
379 * Special case for TM.
380 */
381 if (flushout)
382 flushout = 0;
383 set_my_want_state_dont(option);
384 }
385 set_my_state_dont(option);
386 }
387
388 static void
dooption(option)389 dooption(option)
390 int option;
391 {
392 int new_state_ok = 0;
393
394 if (will_wont_resp[option]) {
395 --will_wont_resp[option];
396 if (will_wont_resp[option] && my_state_is_will(option))
397 --will_wont_resp[option];
398 }
399
400 if (will_wont_resp[option] == 0) {
401 if (my_want_state_is_wont(option)) {
402
403 switch (option) {
404
405 case TELOPT_TM:
406 /*
407 * Special case for TM. We send a WILL, but pretend
408 * we sent WONT.
409 */
410 send_will(option, 0);
411 set_my_want_state_wont(TELOPT_TM);
412 set_my_state_wont(TELOPT_TM);
413 return;
414
415 # if defined(TN3270)
416 case TELOPT_EOR: /* end of record */
417 # endif /* defined(TN3270) */
418 case TELOPT_BINARY: /* binary mode */
419 case TELOPT_NAWS: /* window size */
420 case TELOPT_TSPEED: /* terminal speed */
421 case TELOPT_LFLOW: /* local flow control */
422 case TELOPT_TTYPE: /* terminal type option */
423 case TELOPT_SGA: /* no big deal */
424 #if defined(ENCRYPTION)
425 case TELOPT_ENCRYPT: /* encryption variable option */
426 #endif
427 new_state_ok = 1;
428 break;
429
430 case TELOPT_NEW_ENVIRON: /* New environment variable option */
431 #ifdef OLD_ENVIRON
432 if (my_state_is_will(TELOPT_OLD_ENVIRON))
433 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */
434 goto env_common;
435 case TELOPT_OLD_ENVIRON: /* Old environment variable option */
436 if (my_state_is_will(TELOPT_NEW_ENVIRON))
437 break; /* Don't enable if new one is in use! */
438 env_common:
439 telopt_environ = option;
440 #endif
441 new_state_ok = 1;
442 break;
443
444 #if defined(AUTHENTICATION)
445 case TELOPT_AUTHENTICATION:
446 if (autologin)
447 new_state_ok = 1;
448 break;
449 #endif
450
451 case TELOPT_XDISPLOC: /* X Display location */
452 if (env_getvalue((unsigned char *)"DISPLAY", 0))
453 new_state_ok = 1;
454 break;
455
456 case TELOPT_LINEMODE:
457 #ifdef KLUDGELINEMODE
458 kludgelinemode = 0;
459 send_do(TELOPT_SGA, 1);
460 #endif
461 set_my_want_state_will(TELOPT_LINEMODE);
462 send_will(option, 0);
463 set_my_state_will(TELOPT_LINEMODE);
464 slc_init();
465 return;
466
467 case TELOPT_ECHO: /* We're never going to echo... */
468 default:
469 break;
470 }
471
472 if (new_state_ok) {
473 set_my_want_state_will(option);
474 send_will(option, 0);
475 setconnmode(0); /* Set new tty mode */
476 } else {
477 will_wont_resp[option]++;
478 send_wont(option, 0);
479 }
480 } else {
481 /*
482 * Handle options that need more things done after the
483 * other side has acknowledged the option.
484 */
485 switch (option) {
486 case TELOPT_LINEMODE:
487 #ifdef KLUDGELINEMODE
488 kludgelinemode = 0;
489 send_do(TELOPT_SGA, 1);
490 #endif
491 set_my_state_will(option);
492 slc_init();
493 send_do(TELOPT_SGA, 0);
494 return;
495 }
496 }
497 }
498 set_my_state_will(option);
499 }
500
501 static void
dontoption(option)502 dontoption(option)
503 int option;
504 {
505
506 if (will_wont_resp[option]) {
507 --will_wont_resp[option];
508 if (will_wont_resp[option] && my_state_is_wont(option))
509 --will_wont_resp[option];
510 }
511
512 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
513 switch (option) {
514 case TELOPT_LINEMODE:
515 linemode = 0; /* put us back to the default state */
516 break;
517 #ifdef OLD_ENVIRON
518 case TELOPT_NEW_ENVIRON:
519 /*
520 * The new environ option wasn't recognized, try
521 * the old one.
522 */
523 send_will(TELOPT_OLD_ENVIRON, 1);
524 telopt_environ = TELOPT_OLD_ENVIRON;
525 break;
526 #endif
527 }
528 /* we always accept a DONT */
529 set_my_want_state_wont(option);
530 if (my_state_is_will(option))
531 send_wont(option, 0);
532 setconnmode(0); /* Set new tty mode */
533 }
534 set_my_state_wont(option);
535 }
536
537 /*
538 * This routine will turn a pipe separated list of names in the buffer
539 * into an array of pointers to NUL terminated names. We toss out any
540 * bad, duplicate, or verbose names (names with spaces).
541 */
542
543 int is_unique(char *, char **, char **);
544
545 static char *name_unknown = "UNKNOWN";
546 static char *unknown[] = { 0, 0 };
547
548 char **
mklist(buf,name)549 mklist(buf, name)
550 char *buf, *name;
551 {
552 int n;
553 char c, *cp, **argvp, *cp2, **argv, **avt;
554
555 if (name) {
556 if ((int)strlen(name) > 40) {
557 name = 0;
558 unknown[0] = name_unknown;
559 } else {
560 unknown[0] = name;
561 upcase(name);
562 }
563 } else
564 unknown[0] = name_unknown;
565 /*
566 * Count up the number of names.
567 */
568 for (n = 1, cp = buf; *cp; cp++) {
569 if (*cp == '|')
570 n++;
571 }
572 /*
573 * Allocate an array to put the name pointers into
574 */
575 argv = (char **)malloc((n+3)*sizeof(char *));
576 if (argv == 0)
577 return(unknown);
578
579 /*
580 * Fill up the array of pointers to names.
581 */
582 *argv = 0;
583 argvp = argv+1;
584 n = 0;
585 for (cp = cp2 = buf; (c = *cp); cp++) {
586 if (c == '|' || c == ':') {
587 *cp++ = '\0';
588 /*
589 * Skip entries that have spaces or are over 40
590 * characters long. If this is our environment
591 * name, then put it up front. Otherwise, as
592 * long as this is not a duplicate name (case
593 * insensitive) add it to the list.
594 */
595 if (n || (cp - cp2 > 41))
596 ;
597 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
598 *argv = cp2;
599 else if (is_unique(cp2, argv+1, argvp))
600 *argvp++ = cp2;
601 if (c == ':')
602 break;
603 /*
604 * Skip multiple delimiters. Reset cp2 to
605 * the beginning of the next name. Reset n,
606 * the flag for names with spaces.
607 */
608 while ((c = *cp) == '|')
609 cp++;
610 cp2 = cp;
611 n = 0;
612 }
613 /*
614 * Skip entries with spaces or non-ascii values.
615 * Convert lower case letters to upper case.
616 */
617 #define ISASCII(c) (!((c)&0x80))
618 if ((c == ' ') || !ISASCII(c))
619 n = 1;
620 else if (islower(c))
621 *cp = toupper(c);
622 }
623
624 /*
625 * Check for an old V6 2 character name. If the second
626 * name points to the beginning of the buffer, and is
627 * only 2 characters long, move it to the end of the array.
628 */
629 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
630 --argvp;
631 for (avt = &argv[1]; avt < argvp; avt++)
632 *avt = *(avt+1);
633 *argvp++ = buf;
634 }
635
636 /*
637 * Duplicate last name, for TTYPE option, and null
638 * terminate the array. If we didn't find a match on
639 * our terminal name, put that name at the beginning.
640 */
641 cp = *(argvp-1);
642 *argvp++ = cp;
643 *argvp = 0;
644
645 if (*argv == 0) {
646 if (name)
647 *argv = name;
648 else {
649 --argvp;
650 for (avt = argv; avt < argvp; avt++)
651 *avt = *(avt+1);
652 }
653 }
654 if (*argv)
655 return(argv);
656 else
657 return(unknown);
658 }
659
660 int
is_unique(name,as,ae)661 is_unique(name, as, ae)
662 char *name, **as, **ae;
663 {
664 char **ap;
665 int n;
666
667 n = strlen(name) + 1;
668 for (ap = as; ap < ae; ap++)
669 if (strncasecmp(*ap, name, n) == 0)
670 return(0);
671 return (1);
672 }
673
674 int resettermname = 1;
675
676 char *
gettermname()677 gettermname()
678 {
679 char *tname;
680 static char **tnamep = 0;
681 static char **next;
682 int errret;
683
684 if (resettermname) {
685 resettermname = 0;
686 if (tnamep && tnamep != unknown)
687 free(tnamep);
688 if ((tname = (char *)env_getvalue((unsigned char *)"TERM", 0)) &&
689 (setupterm(tname, 1, &errret) == OK)) {
690 tnamep = mklist(ttytype, tname);
691 } else {
692 if (tname && ((int)strlen(tname) <= 40)) {
693 unknown[0] = tname;
694 upcase(tname);
695 } else
696 unknown[0] = name_unknown;
697 tnamep = unknown;
698 }
699 next = tnamep;
700 }
701 if (*next == 0)
702 next = tnamep;
703 return(*next++);
704 }
705 /*
706 * suboption()
707 *
708 * Look at the sub-option buffer, and try to be helpful to the other
709 * side.
710 *
711 * Currently we recognize:
712 *
713 * Terminal type, send request.
714 * Terminal speed (send request).
715 * Local flow control (is request).
716 * Linemode
717 */
718
719 static void
suboption()720 suboption()
721 {
722 unsigned char subchar;
723
724 printsub('<', subbuffer, SB_LEN()+2);
725 switch (subchar = SB_GET()) {
726 case TELOPT_TTYPE:
727 if (my_want_state_is_wont(TELOPT_TTYPE))
728 return;
729 if (SB_EOF() || SB_GET() != TELQUAL_SEND) {
730 return;
731 } else {
732 char *name;
733 unsigned char temp[50];
734 int len;
735
736 #if defined(TN3270)
737 if (tn3270_ttype()) {
738 return;
739 }
740 #endif /* defined(TN3270) */
741 name = gettermname();
742 len = strlen(name) + 4 + 2;
743 if (len < NETROOM()) {
744 snprintf((char *)temp, sizeof(temp),
745 "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
746 TELQUAL_IS, name, IAC, SE);
747 ring_supply_data(&netoring, temp, len);
748 printsub('>', &temp[2], len-2);
749 } else {
750 ExitString("No room in buffer for terminal type.\n", 1);
751 /*NOTREACHED*/
752 }
753 }
754 break;
755 case TELOPT_TSPEED:
756 if (my_want_state_is_wont(TELOPT_TSPEED))
757 return;
758 if (SB_EOF())
759 return;
760 if (SB_GET() == TELQUAL_SEND) {
761 long ospeed, ispeed;
762 unsigned char temp[50];
763 int len;
764
765 TerminalSpeeds(&ispeed, &ospeed);
766
767 snprintf((char *)temp, sizeof(temp),
768 "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED,
769 TELQUAL_IS, ospeed, ispeed, IAC, SE);
770 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
771
772 if (len < NETROOM()) {
773 ring_supply_data(&netoring, temp, len);
774 printsub('>', temp+2, len - 2);
775 }
776 /*@*/ else printf("lm_will: not enough room in buffer\n");
777 }
778 break;
779 case TELOPT_LFLOW:
780 if (my_want_state_is_wont(TELOPT_LFLOW))
781 return;
782 if (SB_EOF())
783 return;
784 switch(SB_GET()) {
785 case LFLOW_RESTART_ANY:
786 restartany = 1;
787 break;
788 case LFLOW_RESTART_XON:
789 restartany = 0;
790 break;
791 case LFLOW_ON:
792 localflow = 1;
793 break;
794 case LFLOW_OFF:
795 localflow = 0;
796 break;
797 default:
798 return;
799 }
800 setcommandmode();
801 setconnmode(0);
802 break;
803
804 case TELOPT_LINEMODE:
805 if (my_want_state_is_wont(TELOPT_LINEMODE))
806 return;
807 if (SB_EOF())
808 return;
809 switch (SB_GET()) {
810 case WILL:
811 lm_will(subpointer, SB_LEN());
812 break;
813 case WONT:
814 lm_wont(subpointer, SB_LEN());
815 break;
816 case DO:
817 lm_do(subpointer, SB_LEN());
818 break;
819 case DONT:
820 lm_dont(subpointer, SB_LEN());
821 break;
822 case LM_SLC:
823 slc(subpointer, SB_LEN());
824 break;
825 case LM_MODE:
826 lm_mode(subpointer, SB_LEN(), 0);
827 break;
828 default:
829 break;
830 }
831 break;
832
833 #ifdef OLD_ENVIRON
834 case TELOPT_OLD_ENVIRON:
835 #endif
836 case TELOPT_NEW_ENVIRON:
837 if (SB_EOF())
838 return;
839 switch(SB_PEEK()) {
840 case TELQUAL_IS:
841 case TELQUAL_INFO:
842 if (my_want_state_is_dont(subchar))
843 return;
844 break;
845 case TELQUAL_SEND:
846 if (my_want_state_is_wont(subchar)) {
847 return;
848 }
849 break;
850 default:
851 return;
852 }
853 env_opt(subpointer, SB_LEN());
854 break;
855
856 case TELOPT_XDISPLOC:
857 if (my_want_state_is_wont(TELOPT_XDISPLOC))
858 return;
859 if (SB_EOF())
860 return;
861 if (SB_GET() == TELQUAL_SEND) {
862 unsigned char temp[50], *dp;
863 int len;
864
865 if ((dp = env_getvalue((unsigned char *)"DISPLAY", 0)) == NULL) {
866 /*
867 * Something happened, we no longer have a DISPLAY
868 * variable. So, turn off the option.
869 */
870 send_wont(TELOPT_XDISPLOC, 1);
871 break;
872 }
873 snprintf((char *)temp, sizeof(temp),
874 "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC,
875 TELQUAL_IS, dp, IAC, SE);
876 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
877
878 if (len < NETROOM()) {
879 ring_supply_data(&netoring, temp, len);
880 printsub('>', temp+2, len - 2);
881 }
882 /*@*/ else printf("lm_will: not enough room in buffer\n");
883 }
884 break;
885
886 #if defined(AUTHENTICATION)
887 case TELOPT_AUTHENTICATION: {
888 if (!autologin)
889 break;
890 if (SB_EOF())
891 return;
892 switch(SB_GET()) {
893 case TELQUAL_IS:
894 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
895 return;
896 auth_is(subpointer, SB_LEN());
897 break;
898 case TELQUAL_SEND:
899 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
900 return;
901 auth_send(subpointer, SB_LEN());
902 break;
903 case TELQUAL_REPLY:
904 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
905 return;
906 auth_reply(subpointer, SB_LEN());
907 break;
908 case TELQUAL_NAME:
909 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
910 return;
911 auth_name(subpointer, SB_LEN());
912 break;
913 }
914 }
915 break;
916 #endif
917 #if defined(ENCRYPTION)
918 case TELOPT_ENCRYPT:
919 if (SB_EOF())
920 return;
921 switch(SB_GET()) {
922 case ENCRYPT_START:
923 if (my_want_state_is_dont(TELOPT_ENCRYPT))
924 return;
925 encrypt_start(subpointer, SB_LEN());
926 break;
927 case ENCRYPT_END:
928 if (my_want_state_is_dont(TELOPT_ENCRYPT))
929 return;
930 encrypt_end();
931 break;
932 case ENCRYPT_SUPPORT:
933 if (my_want_state_is_wont(TELOPT_ENCRYPT))
934 return;
935 encrypt_support(subpointer, SB_LEN());
936 break;
937 case ENCRYPT_REQSTART:
938 if (my_want_state_is_wont(TELOPT_ENCRYPT))
939 return;
940 encrypt_request_start(subpointer, SB_LEN());
941 break;
942 case ENCRYPT_REQEND:
943 if (my_want_state_is_wont(TELOPT_ENCRYPT))
944 return;
945 /*
946 * We can always send an REQEND so that we cannot
947 * get stuck encrypting. We should only get this
948 * if we have been able to get in the correct mode
949 * anyhow.
950 */
951 encrypt_request_end();
952 break;
953 case ENCRYPT_IS:
954 if (my_want_state_is_dont(TELOPT_ENCRYPT))
955 return;
956 encrypt_is(subpointer, SB_LEN());
957 break;
958 case ENCRYPT_REPLY:
959 if (my_want_state_is_wont(TELOPT_ENCRYPT))
960 return;
961 encrypt_reply(subpointer, SB_LEN());
962 break;
963 case ENCRYPT_ENC_KEYID:
964 if (my_want_state_is_dont(TELOPT_ENCRYPT))
965 return;
966 encrypt_enc_keyid(subpointer, SB_LEN());
967 break;
968 case ENCRYPT_DEC_KEYID:
969 if (my_want_state_is_wont(TELOPT_ENCRYPT))
970 return;
971 encrypt_dec_keyid(subpointer, SB_LEN());
972 break;
973 default:
974 break;
975 }
976 break;
977 #endif
978 default:
979 break;
980 }
981 }
982
983 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
984
985 void
lm_will(cmd,len)986 lm_will(cmd, len)
987 unsigned char *cmd;
988 int len;
989 {
990 if (len < 1) {
991 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */
992 return;
993 }
994 switch(cmd[0]) {
995 case LM_FORWARDMASK: /* We shouldn't ever get this... */
996 default:
997 str_lm[3] = DONT;
998 str_lm[4] = cmd[0];
999 if (NETROOM() > sizeof(str_lm)) {
1000 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1001 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1002 }
1003 /*@*/ else printf("lm_will: not enough room in buffer\n");
1004 break;
1005 }
1006 }
1007
1008 void
lm_wont(cmd,len)1009 lm_wont(cmd, len)
1010 unsigned char *cmd;
1011 int len;
1012 {
1013 if (len < 1) {
1014 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */
1015 return;
1016 }
1017 switch(cmd[0]) {
1018 case LM_FORWARDMASK: /* We shouldn't ever get this... */
1019 default:
1020 /* We are always DONT, so don't respond */
1021 return;
1022 }
1023 }
1024
1025 void
lm_do(cmd,len)1026 lm_do(cmd, len)
1027 unsigned char *cmd;
1028 int len;
1029 {
1030 if (len < 1) {
1031 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */
1032 return;
1033 }
1034 switch(cmd[0]) {
1035 case LM_FORWARDMASK:
1036 default:
1037 str_lm[3] = WONT;
1038 str_lm[4] = cmd[0];
1039 if (NETROOM() > sizeof(str_lm)) {
1040 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1041 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1042 }
1043 /*@*/ else printf("lm_do: not enough room in buffer\n");
1044 break;
1045 }
1046 }
1047
1048 void
lm_dont(cmd,len)1049 lm_dont(cmd, len)
1050 unsigned char *cmd;
1051 int len;
1052 {
1053 if (len < 1) {
1054 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */
1055 return;
1056 }
1057 switch(cmd[0]) {
1058 case LM_FORWARDMASK:
1059 default:
1060 /* we are always WONT, so don't respond */
1061 break;
1062 }
1063 }
1064
1065 static unsigned char str_lm_mode[] = {
1066 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE
1067 };
1068
1069 void
lm_mode(cmd,len,init)1070 lm_mode(cmd, len, init)
1071 unsigned char *cmd;
1072 int len, init;
1073 {
1074 if (len != 1)
1075 return;
1076 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd)
1077 return;
1078 if (*cmd&MODE_ACK)
1079 return;
1080 linemode = *cmd&(MODE_MASK&~MODE_ACK);
1081 str_lm_mode[4] = linemode;
1082 if (!init)
1083 str_lm_mode[4] |= MODE_ACK;
1084 if (NETROOM() > sizeof(str_lm_mode)) {
1085 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode));
1086 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2);
1087 }
1088 /*@*/ else printf("lm_mode: not enough room in buffer\n");
1089 setconnmode(0); /* set changed mode */
1090 }
1091
1092
1093
1094 /*
1095 * slc()
1096 * Handle special character suboption of LINEMODE.
1097 */
1098
1099 struct spc {
1100 cc_t val;
1101 cc_t *valp;
1102 char flags; /* Current flags & level */
1103 char mylevel; /* Maximum level & flags */
1104 } spc_data[NSLC+1];
1105
1106 #define SLC_IMPORT 0
1107 #define SLC_EXPORT 1
1108 #define SLC_RVALUE 2
1109 static int slc_mode = SLC_EXPORT;
1110
1111 void
slc_init()1112 slc_init()
1113 {
1114 struct spc *spcp;
1115
1116 localchars = 1;
1117 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
1118 spcp->val = 0;
1119 spcp->valp = 0;
1120 spcp->flags = spcp->mylevel = SLC_NOSUPPORT;
1121 }
1122
1123 #define initfunc(func, flags) { \
1124 spcp = &spc_data[func]; \
1125 if ((spcp->valp = tcval(func))) { \
1126 spcp->val = *spcp->valp; \
1127 spcp->mylevel = SLC_VARIABLE|flags; \
1128 } else { \
1129 spcp->val = 0; \
1130 spcp->mylevel = SLC_DEFAULT; \
1131 } \
1132 }
1133
1134 initfunc(SLC_SYNCH, 0);
1135 /* No BRK */
1136 initfunc(SLC_AO, 0);
1137 initfunc(SLC_AYT, 0);
1138 /* No EOR */
1139 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT);
1140 initfunc(SLC_EOF, 0);
1141 #ifndef SYSV_TERMIO
1142 initfunc(SLC_SUSP, SLC_FLUSHIN);
1143 #endif
1144 initfunc(SLC_EC, 0);
1145 initfunc(SLC_EL, 0);
1146 #ifndef SYSV_TERMIO
1147 initfunc(SLC_EW, 0);
1148 initfunc(SLC_RP, 0);
1149 initfunc(SLC_LNEXT, 0);
1150 #endif
1151 initfunc(SLC_XON, 0);
1152 initfunc(SLC_XOFF, 0);
1153 #ifdef SYSV_TERMIO
1154 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE;
1155 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE;
1156 #endif
1157 initfunc(SLC_FORW1, 0);
1158 #ifdef USE_TERMIO
1159 initfunc(SLC_FORW2, 0);
1160 /* No FORW2 */
1161 #endif
1162
1163 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT);
1164 #undef initfunc
1165
1166 if (slc_mode == SLC_EXPORT)
1167 slc_export();
1168 else
1169 slc_import(1);
1170
1171 }
1172
1173 void
slcstate()1174 slcstate()
1175 {
1176 printf("Special characters are %s values\n",
1177 slc_mode == SLC_IMPORT ? "remote default" :
1178 slc_mode == SLC_EXPORT ? "local" :
1179 "remote");
1180 }
1181
1182 void
slc_mode_export()1183 slc_mode_export()
1184 {
1185 slc_mode = SLC_EXPORT;
1186 if (my_state_is_will(TELOPT_LINEMODE))
1187 slc_export();
1188 }
1189
1190 void
slc_mode_import(def)1191 slc_mode_import(def)
1192 int def;
1193 {
1194 slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
1195 if (my_state_is_will(TELOPT_LINEMODE))
1196 slc_import(def);
1197 }
1198
1199 unsigned char slc_import_val[] = {
1200 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
1201 };
1202 unsigned char slc_import_def[] = {
1203 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
1204 };
1205
1206 void
slc_import(def)1207 slc_import(def)
1208 int def;
1209 {
1210 if (NETROOM() > sizeof(slc_import_val)) {
1211 if (def) {
1212 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def));
1213 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2);
1214 } else {
1215 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val));
1216 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2);
1217 }
1218 }
1219 /*@*/ else printf("slc_import: not enough room\n");
1220 }
1221
1222 void
slc_export()1223 slc_export()
1224 {
1225 struct spc *spcp;
1226
1227 TerminalDefaultChars();
1228
1229 slc_start_reply();
1230 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1231 if (spcp->mylevel != SLC_NOSUPPORT) {
1232 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1233 spcp->flags = SLC_NOSUPPORT;
1234 else
1235 spcp->flags = spcp->mylevel;
1236 if (spcp->valp)
1237 spcp->val = *spcp->valp;
1238 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1239 }
1240 }
1241 slc_end_reply();
1242 (void)slc_update();
1243 setconnmode(1); /* Make sure the character values are set */
1244 }
1245
1246 void
slc(cp,len)1247 slc(cp, len)
1248 unsigned char *cp;
1249 int len;
1250 {
1251 struct spc *spcp;
1252 int func,level;
1253
1254 slc_start_reply();
1255
1256 for (; len >= 3; len -=3, cp +=3) {
1257
1258 func = cp[SLC_FUNC];
1259
1260 if (func == 0) {
1261 /*
1262 * Client side: always ignore 0 function.
1263 */
1264 continue;
1265 }
1266 if (func > NSLC) {
1267 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT)
1268 slc_add_reply(func, SLC_NOSUPPORT, 0);
1269 continue;
1270 }
1271
1272 spcp = &spc_data[func];
1273
1274 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK);
1275
1276 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) &&
1277 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) {
1278 continue;
1279 }
1280
1281 if (level == (SLC_DEFAULT|SLC_ACK)) {
1282 /*
1283 * This is an error condition, the SLC_ACK
1284 * bit should never be set for the SLC_DEFAULT
1285 * level. Our best guess to recover is to
1286 * ignore the SLC_ACK bit.
1287 */
1288 cp[SLC_FLAGS] &= ~SLC_ACK;
1289 }
1290
1291 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) {
1292 spcp->val = (cc_t)cp[SLC_VALUE];
1293 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */
1294 continue;
1295 }
1296
1297 level &= ~SLC_ACK;
1298
1299 if (level <= (spcp->mylevel&SLC_LEVELBITS)) {
1300 spcp->flags = cp[SLC_FLAGS]|SLC_ACK;
1301 spcp->val = (cc_t)cp[SLC_VALUE];
1302 }
1303 if (level == SLC_DEFAULT) {
1304 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT)
1305 spcp->flags = spcp->mylevel;
1306 else
1307 spcp->flags = SLC_NOSUPPORT;
1308 }
1309 slc_add_reply(func, spcp->flags, spcp->val);
1310 }
1311 slc_end_reply();
1312 if (slc_update())
1313 setconnmode(1); /* set the new character values */
1314 }
1315
1316 void
slc_check()1317 slc_check()
1318 {
1319 struct spc *spcp;
1320
1321 slc_start_reply();
1322 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1323 if (spcp->valp && spcp->val != *spcp->valp) {
1324 spcp->val = *spcp->valp;
1325 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1326 spcp->flags = SLC_NOSUPPORT;
1327 else
1328 spcp->flags = spcp->mylevel;
1329 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1330 }
1331 }
1332 slc_end_reply();
1333 setconnmode(1);
1334 }
1335
1336
1337 static unsigned char slc_reply[2 * SUBBUFSIZE];
1338 static unsigned char *slc_replyp;
1339
1340 unsigned char
slc_add(unsigned char ch)1341 slc_add(unsigned char ch)
1342 {
1343 if (slc_replyp == slc_reply + sizeof(slc_reply))
1344 return ch;
1345 return *slc_replyp++ = ch;
1346 }
1347
1348 void
slc_start_reply()1349 slc_start_reply()
1350 {
1351 slc_replyp = slc_reply;
1352 slc_add(IAC);
1353 slc_add(SB);
1354 slc_add(TELOPT_LINEMODE);
1355 slc_add(LM_SLC);
1356 }
1357
1358 void
slc_add_reply(func,flags,value)1359 slc_add_reply(func, flags, value)
1360 unsigned char func;
1361 unsigned char flags;
1362 cc_t value;
1363 {
1364 if (slc_replyp + 6 >= slc_reply + sizeof(slc_reply)) {
1365 printf("slc_add_reply: not enough room\n");
1366 return;
1367 }
1368 if (slc_add(func) == IAC)
1369 slc_add(IAC);
1370 if (slc_add(flags) == IAC)
1371 slc_add(IAC);
1372 if (slc_add((unsigned char)value) == IAC)
1373 slc_add(IAC);
1374 }
1375
1376 void
slc_end_reply()1377 slc_end_reply()
1378 {
1379 int len;
1380
1381 if (slc_replyp + 2 >= slc_reply + sizeof(slc_reply)) {
1382 printf("slc_end_reply: not enough room\n");
1383 return;
1384 }
1385
1386 slc_add(IAC);
1387 slc_add(SE);
1388 len = slc_replyp - slc_reply;
1389 if (len <= 6)
1390 return;
1391 if (NETROOM() > len) {
1392 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply);
1393 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2);
1394 }
1395 /*@*/else printf("slc_end_reply: not enough room\n");
1396 }
1397
1398 int
slc_update()1399 slc_update()
1400 {
1401 struct spc *spcp;
1402 int need_update = 0;
1403
1404 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1405 if (!(spcp->flags&SLC_ACK))
1406 continue;
1407 spcp->flags &= ~SLC_ACK;
1408 if (spcp->valp && (*spcp->valp != spcp->val)) {
1409 *spcp->valp = spcp->val;
1410 need_update = 1;
1411 }
1412 }
1413 return(need_update);
1414 }
1415
1416 #ifdef OLD_ENVIRON
1417 # ifdef ENV_HACK
1418 /*
1419 * Earlier version of telnet/telnetd from the BSD code had
1420 * the definitions of VALUE and VAR reversed. To ensure
1421 * maximum interoperability, we assume that the server is
1422 * an older BSD server, until proven otherwise. The newer
1423 * BSD servers should be able to handle either definition,
1424 * so it is better to use the wrong values if we don't
1425 * know what type of server it is.
1426 */
1427 int env_auto = 1;
1428 int old_env_var = OLD_ENV_VAR;
1429 int old_env_value = OLD_ENV_VALUE;
1430 # else
1431 # define old_env_var OLD_ENV_VAR
1432 # define old_env_value OLD_ENV_VALUE
1433 # endif
1434 #endif
1435
1436 void
env_opt(buf,len)1437 env_opt(buf, len)
1438 unsigned char *buf;
1439 int len;
1440 {
1441 unsigned char *ep = 0, *epc = 0;
1442 int i;
1443
1444 switch(buf[0]&0xff) {
1445 case TELQUAL_SEND:
1446 env_opt_start();
1447 if (len == 1) {
1448 env_opt_add(NULL);
1449 } else for (i = 1; i < len; i++) {
1450 switch (buf[i]&0xff) {
1451 #ifdef OLD_ENVIRON
1452 case OLD_ENV_VAR:
1453 # ifdef ENV_HACK
1454 if (telopt_environ == TELOPT_OLD_ENVIRON
1455 && env_auto) {
1456 /* Server has the same definitions */
1457 old_env_var = OLD_ENV_VAR;
1458 old_env_value = OLD_ENV_VALUE;
1459 }
1460 /* FALL THROUGH */
1461 # endif
1462 case OLD_ENV_VALUE:
1463 /*
1464 * Although OLD_ENV_VALUE is not legal, we will
1465 * still recognize it, just in case it is an
1466 * old server that has VAR & VALUE mixed up...
1467 */
1468 /* FALL THROUGH */
1469 #else
1470 case NEW_ENV_VAR:
1471 #endif
1472 case ENV_USERVAR:
1473 if (ep) {
1474 *epc = 0;
1475 env_opt_add(ep);
1476 }
1477 ep = epc = &buf[i+1];
1478 break;
1479 case ENV_ESC:
1480 i++;
1481 /*FALL THROUGH*/
1482 default:
1483 if (epc)
1484 *epc++ = buf[i];
1485 break;
1486 }
1487 }
1488 if (ep) {
1489 *epc = 0;
1490 env_opt_add(ep);
1491 }
1492 env_opt_end(1);
1493 break;
1494
1495 case TELQUAL_IS:
1496 case TELQUAL_INFO:
1497 /* Ignore for now. We shouldn't get it anyway. */
1498 break;
1499
1500 default:
1501 break;
1502 }
1503 }
1504
1505 #define OPT_REPLY_SIZE (2 * SUBBUFSIZE)
1506 static unsigned char *opt_reply;
1507 static unsigned char *opt_replyp;
1508 static unsigned char *opt_replyend;
1509
1510 void
opt_add(unsigned char ch)1511 opt_add(unsigned char ch)
1512 {
1513 if (opt_replyp == opt_replyend)
1514 return;
1515 *opt_replyp++ = ch;
1516 }
1517 void
env_opt_start()1518 env_opt_start()
1519 {
1520 unsigned char *p;
1521
1522 if (opt_reply) {
1523 p = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE);
1524 if (p == NULL)
1525 free(opt_reply);
1526 } else
1527 p = (unsigned char *)malloc(OPT_REPLY_SIZE);
1528 opt_reply = p;
1529 if (opt_reply == NULL) {
1530 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n");
1531 opt_reply = opt_replyp = opt_replyend = NULL;
1532 return;
1533 }
1534 opt_replyp = opt_reply;
1535 opt_replyend = opt_reply + OPT_REPLY_SIZE;
1536 opt_add(IAC);
1537 opt_add(SB);
1538 opt_add(telopt_environ);
1539 opt_add(TELQUAL_IS);
1540 }
1541
1542 void
env_opt_start_info()1543 env_opt_start_info()
1544 {
1545 env_opt_start();
1546 if (opt_replyp)
1547 opt_replyp[-1] = TELQUAL_INFO;
1548 }
1549
1550 void
env_opt_add(ep)1551 env_opt_add(ep)
1552 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, 1);
1572 if (opt_replyp + 2 * (vp ? strlen((char *)vp) : 0) +
1573 2 * strlen((char *)ep) + 6 > opt_replyend)
1574 {
1575 size_t len;
1576 unsigned char *p;
1577
1578 len = opt_replyend - opt_reply;
1579 len += OPT_REPLY_SIZE + 2 * strlen(ep);
1580 if (vp)
1581 len += 2 * strlen(vp);
1582 p = (unsigned char *)realloc(opt_reply, len);
1583 if (p == NULL) {
1584 free(opt_reply);
1585 /*@*/ printf("env_opt_add: realloc() failed!!!\n");
1586 opt_reply = opt_replyp = opt_replyend = NULL;
1587 return;
1588 }
1589 opt_replyp = p + (opt_replyp - opt_reply);
1590 opt_replyend = p + len;
1591 opt_reply = p;
1592 }
1593 if (opt_welldefined((char *)ep))
1594 #ifdef OLD_ENVIRON
1595 if (telopt_environ == TELOPT_OLD_ENVIRON)
1596 opt_add(old_env_var);
1597 else
1598 #endif
1599 opt_add(NEW_ENV_VAR);
1600 else
1601 opt_add(ENV_USERVAR);
1602
1603 for (;;) {
1604 while ((c = *ep++)) {
1605 switch(c&0xff) {
1606 case IAC:
1607 opt_add(IAC);
1608 break;
1609 case NEW_ENV_VAR:
1610 case NEW_ENV_VALUE:
1611 case ENV_ESC:
1612 case ENV_USERVAR:
1613 opt_add(ENV_ESC);
1614 break;
1615 }
1616 opt_add(c);
1617 }
1618 if ((ep = vp)) {
1619 #ifdef OLD_ENVIRON
1620 if (telopt_environ == TELOPT_OLD_ENVIRON)
1621 opt_add(old_env_value);
1622 else
1623 #endif
1624 opt_add(NEW_ENV_VALUE);
1625 vp = NULL;
1626 } else
1627 break;
1628 }
1629 }
1630
1631 int
opt_welldefined(ep)1632 opt_welldefined(ep)
1633 char *ep;
1634 {
1635 if ((strcmp(ep, "USER") == 0) ||
1636 (strcmp(ep, "DISPLAY") == 0) ||
1637 (strcmp(ep, "PRINTER") == 0) ||
1638 (strcmp(ep, "SYSTEMTYPE") == 0) ||
1639 (strcmp(ep, "JOB") == 0) ||
1640 (strcmp(ep, "ACCT") == 0))
1641 return(1);
1642 return(0);
1643 }
1644 void
env_opt_end(emptyok)1645 env_opt_end(emptyok)
1646 int emptyok;
1647 {
1648 int len;
1649
1650 len = opt_replyp - opt_reply + 2;
1651 if (emptyok || len > 6) {
1652 opt_add(IAC);
1653 opt_add(SE);
1654 if (NETROOM() > len) {
1655 ring_supply_data(&netoring, opt_reply, len);
1656 printsub('>', &opt_reply[2], len - 2);
1657 }
1658 /*@*/ else printf("slc_end_reply: not enough room\n");
1659 }
1660 if (opt_reply) {
1661 free(opt_reply);
1662 opt_reply = opt_replyp = opt_replyend = NULL;
1663 }
1664 }
1665
1666
1667
1668 int
telrcv()1669 telrcv()
1670 {
1671 int c;
1672 int scc;
1673 unsigned char *sbp = netiring.consume;
1674 int count;
1675 int returnValue = 0;
1676
1677 scc = 0;
1678 count = 0;
1679 while (TTYROOM() > 2) {
1680 if (scc == 0) {
1681 if (count) {
1682 ring_consumed(&netiring, count);
1683 returnValue = 1;
1684 count = 0;
1685 }
1686 sbp = netiring.consume;
1687 scc = ring_full_consecutive(&netiring);
1688 if (scc == 0) {
1689 /* No more data coming in */
1690 break;
1691 }
1692 }
1693
1694 c = *sbp++ & 0xff, scc--; count++;
1695 #if defined(ENCRYPTION)
1696 if (decrypt_input)
1697 c = (*decrypt_input)(c);
1698 #endif
1699
1700 switch (telrcv_state) {
1701
1702 case TS_CR:
1703 telrcv_state = TS_DATA;
1704 if (c == '\0') {
1705 break; /* Ignore \0 after CR */
1706 }
1707 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) {
1708 TTYADD(c);
1709 break;
1710 }
1711 /* Else, fall through */
1712
1713 case TS_DATA:
1714 if (c == IAC) {
1715 telrcv_state = TS_IAC;
1716 break;
1717 }
1718 # if defined(TN3270)
1719 if (In3270) {
1720 *Ifrontp++ = c;
1721 while (scc > 0) {
1722 c = *sbp++ & 0377, scc--; count++;
1723 if (c == IAC) {
1724 telrcv_state = TS_IAC;
1725 break;
1726 }
1727 *Ifrontp++ = c;
1728 }
1729 } else
1730 # endif /* defined(TN3270) */
1731 /*
1732 * The 'crmod' hack (see following) is needed
1733 * since we can't set CRMOD on output only.
1734 * Machines like MULTICS like to send \r without
1735 * \n; since we must turn off CRMOD to get proper
1736 * input, the mapping is done here (sigh).
1737 */
1738 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) {
1739 if (scc > 0) {
1740 c = *sbp&0xff;
1741 #if defined(ENCRYPTION)
1742 if (decrypt_input)
1743 c = (*decrypt_input)(c);
1744 #endif
1745 if (c == 0) {
1746 sbp++, scc--; count++;
1747 /* a "true" CR */
1748 TTYADD('\r');
1749 } else if (my_want_state_is_dont(TELOPT_ECHO) &&
1750 (c == '\n')) {
1751 sbp++, scc--; count++;
1752 TTYADD('\n');
1753 } else {
1754 #if defined(ENCRYPTION)
1755 if (decrypt_input)
1756 (*decrypt_input)(-1);
1757 #endif
1758 TTYADD('\r');
1759 if (crmod) {
1760 TTYADD('\n');
1761 }
1762 }
1763 } else {
1764 telrcv_state = TS_CR;
1765 TTYADD('\r');
1766 if (crmod) {
1767 TTYADD('\n');
1768 }
1769 }
1770 } else {
1771 TTYADD(c);
1772 }
1773 continue;
1774
1775 case TS_IAC:
1776 process_iac:
1777 switch (c) {
1778
1779 case WILL:
1780 telrcv_state = TS_WILL;
1781 continue;
1782
1783 case WONT:
1784 telrcv_state = TS_WONT;
1785 continue;
1786
1787 case DO:
1788 telrcv_state = TS_DO;
1789 continue;
1790
1791 case DONT:
1792 telrcv_state = TS_DONT;
1793 continue;
1794
1795 case DM:
1796 /*
1797 * We may have missed an urgent notification,
1798 * so make sure we flush whatever is in the
1799 * buffer currently.
1800 */
1801 printoption("RCVD", IAC, DM);
1802 SYNCHing = 1;
1803 (void) ttyflush(1);
1804 SYNCHing = stilloob();
1805 settimer(gotDM);
1806 break;
1807
1808 case SB:
1809 SB_CLEAR();
1810 telrcv_state = TS_SB;
1811 continue;
1812
1813 # if defined(TN3270)
1814 case EOR:
1815 if (In3270) {
1816 if (Ibackp == Ifrontp) {
1817 Ibackp = Ifrontp = Ibuf;
1818 ISend = 0; /* should have been! */
1819 } else {
1820 Ibackp += DataFromNetwork(Ibackp, Ifrontp-Ibackp, 1);
1821 ISend = 1;
1822 }
1823 }
1824 printoption("RCVD", IAC, EOR);
1825 break;
1826 # endif /* defined(TN3270) */
1827
1828 case IAC:
1829 # if !defined(TN3270)
1830 TTYADD(IAC);
1831 # else /* !defined(TN3270) */
1832 if (In3270) {
1833 *Ifrontp++ = IAC;
1834 } else {
1835 TTYADD(IAC);
1836 }
1837 # endif /* !defined(TN3270) */
1838 break;
1839
1840 case NOP:
1841 case GA:
1842 default:
1843 printoption("RCVD", IAC, c);
1844 break;
1845 }
1846 telrcv_state = TS_DATA;
1847 continue;
1848
1849 case TS_WILL:
1850 printoption("RCVD", WILL, c);
1851 willoption(c);
1852 SetIn3270();
1853 telrcv_state = TS_DATA;
1854 continue;
1855
1856 case TS_WONT:
1857 printoption("RCVD", WONT, c);
1858 wontoption(c);
1859 SetIn3270();
1860 telrcv_state = TS_DATA;
1861 continue;
1862
1863 case TS_DO:
1864 printoption("RCVD", DO, c);
1865 dooption(c);
1866 SetIn3270();
1867 if (c == TELOPT_NAWS) {
1868 sendnaws();
1869 } else if (c == TELOPT_LFLOW) {
1870 localflow = 1;
1871 setcommandmode();
1872 setconnmode(0);
1873 }
1874 telrcv_state = TS_DATA;
1875 continue;
1876
1877 case TS_DONT:
1878 printoption("RCVD", DONT, c);
1879 dontoption(c);
1880 flushline = 1;
1881 setconnmode(0); /* set new tty mode (maybe) */
1882 SetIn3270();
1883 telrcv_state = TS_DATA;
1884 continue;
1885
1886 case TS_SB:
1887 if (c == IAC) {
1888 telrcv_state = TS_SE;
1889 } else {
1890 SB_ACCUM(c);
1891 }
1892 continue;
1893
1894 case TS_SE:
1895 if (c != SE) {
1896 if (c != IAC) {
1897 /*
1898 * This is an error. We only expect to get
1899 * "IAC IAC" or "IAC SE". Several things may
1900 * have happened. An IAC was not doubled, the
1901 * IAC SE was left off, or another option got
1902 * inserted into the suboption are all possibilities.
1903 * If we assume that the IAC was not doubled,
1904 * and really the IAC SE was left off, we could
1905 * get into an infinate loop here. So, instead,
1906 * we terminate the suboption, and process the
1907 * partial suboption if we can.
1908 */
1909 SB_ACCUM(IAC);
1910 SB_ACCUM(c);
1911 subpointer -= 2;
1912 SB_TERM();
1913
1914 printoption("In SUBOPTION processing, RCVD", IAC, c);
1915 suboption(); /* handle sub-option */
1916 SetIn3270();
1917 telrcv_state = TS_IAC;
1918 goto process_iac;
1919 }
1920 SB_ACCUM(c);
1921 telrcv_state = TS_SB;
1922 } else {
1923 SB_ACCUM(IAC);
1924 SB_ACCUM(SE);
1925 subpointer -= 2;
1926 SB_TERM();
1927 suboption(); /* handle sub-option */
1928 SetIn3270();
1929 telrcv_state = TS_DATA;
1930 }
1931 }
1932 }
1933 if (count)
1934 ring_consumed(&netiring, count);
1935 return returnValue||count;
1936 }
1937
1938 static int bol = 1, local = 0;
1939
1940 int
rlogin_susp()1941 rlogin_susp()
1942 {
1943 if (local) {
1944 local = 0;
1945 bol = 1;
1946 command(0, "z\n", 2);
1947 return(1);
1948 }
1949 return(0);
1950 }
1951
1952 static int
telsnd()1953 telsnd()
1954 {
1955 int tcc;
1956 int count;
1957 int returnValue = 0;
1958 unsigned char *tbp = ttyiring.consume;
1959
1960 tcc = 0;
1961 count = 0;
1962 while (NETROOM() > 2) {
1963 int sc;
1964 int c;
1965
1966 if (tcc == 0) {
1967 if (count) {
1968 ring_consumed(&ttyiring, count);
1969 returnValue = 1;
1970 count = 0;
1971 }
1972 tbp = ttyiring.consume;
1973 tcc = ring_full_consecutive(&ttyiring);
1974 if (tcc == 0) {
1975 break;
1976 }
1977 }
1978 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
1979 if (rlogin != _POSIX_VDISABLE) {
1980 if (bol) {
1981 bol = 0;
1982 if (sc == rlogin) {
1983 local = 1;
1984 continue;
1985 }
1986 } else if (local) {
1987 local = 0;
1988 if (sc == '.' || c == termEofChar) {
1989 bol = 1;
1990 command(0, "close\n", 6);
1991 continue;
1992 }
1993 if (sc == termSuspChar) {
1994 bol = 1;
1995 command(0, "z\n", 2);
1996 continue;
1997 }
1998 if (sc == escape) {
1999 command(0, (char *)tbp, tcc);
2000 bol = 1;
2001 count += tcc;
2002 tcc = 0;
2003 flushline = 1;
2004 break;
2005 }
2006 if (sc != rlogin) {
2007 ++tcc;
2008 --tbp;
2009 --count;
2010 c = sc = rlogin;
2011 }
2012 }
2013 if ((sc == '\n') || (sc == '\r'))
2014 bol = 1;
2015 } else if (escape != _POSIX_VDISABLE && sc == escape) {
2016 /*
2017 * Double escape is a pass through of a single escape character.
2018 */
2019 if (tcc && strip(*tbp) == escape) {
2020 tbp++;
2021 tcc--;
2022 count++;
2023 bol = 0;
2024 } else {
2025 command(0, (char *)tbp, tcc);
2026 bol = 1;
2027 count += tcc;
2028 tcc = 0;
2029 flushline = 1;
2030 break;
2031 }
2032 } else
2033 bol = 0;
2034 #ifdef KLUDGELINEMODE
2035 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
2036 if (tcc > 0 && strip(*tbp) == echoc) {
2037 tcc--; tbp++; count++;
2038 } else {
2039 dontlecho = !dontlecho;
2040 settimer(echotoggle);
2041 setconnmode(0);
2042 flushline = 1;
2043 break;
2044 }
2045 }
2046 #endif
2047 if (sc != _POSIX_VDISABLE && MODE_LOCAL_CHARS(globalmode)) {
2048 if (TerminalSpecialChars(sc) == 0) {
2049 bol = 1;
2050 break;
2051 }
2052 }
2053 if (my_want_state_is_wont(TELOPT_BINARY)) {
2054 switch (c) {
2055 case '\n':
2056 /*
2057 * If we are in CRMOD mode (\r ==> \n)
2058 * on our local machine, then probably
2059 * a newline (unix) is CRLF (TELNET).
2060 */
2061 if (MODE_LOCAL_CHARS(globalmode)) {
2062 NETADD('\r');
2063 }
2064 NETADD('\n');
2065 bol = flushline = 1;
2066 break;
2067 case '\r':
2068 if (!crlf) {
2069 NET2ADD('\r', '\0');
2070 } else {
2071 NET2ADD('\r', '\n');
2072 }
2073 bol = flushline = 1;
2074 break;
2075 case IAC:
2076 NET2ADD(IAC, IAC);
2077 break;
2078 default:
2079 NETADD(c);
2080 break;
2081 }
2082 } else if (c == IAC) {
2083 NET2ADD(IAC, IAC);
2084 } else {
2085 NETADD(c);
2086 }
2087 }
2088 if (count)
2089 ring_consumed(&ttyiring, count);
2090 return returnValue||count; /* Non-zero if we did anything */
2091 }
2092
2093 /*
2094 * Scheduler()
2095 *
2096 * Try to do something.
2097 *
2098 * If we do something useful, return 1; else return 0.
2099 *
2100 */
2101
2102
2103 int
Scheduler(block)2104 Scheduler(block)
2105 int block; /* should we block in the select ? */
2106 {
2107 /* One wants to be a bit careful about setting returnValue
2108 * to one, since a one implies we did some useful work,
2109 * and therefore probably won't be called to block next
2110 * time (TN3270 mode only).
2111 */
2112 int returnValue;
2113 int netin, netout, netex, ttyin, ttyout;
2114
2115 /* Decide which rings should be processed */
2116
2117 netout = ring_full_count(&netoring) &&
2118 (flushline ||
2119 (my_want_state_is_wont(TELOPT_LINEMODE)
2120 #ifdef KLUDGELINEMODE
2121 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
2122 #endif
2123 ) ||
2124 my_want_state_is_will(TELOPT_BINARY));
2125 ttyout = ring_full_count(&ttyoring);
2126
2127 #if defined(TN3270)
2128 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0) && (shell_active == 0);
2129 #else /* defined(TN3270) */
2130 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0);
2131 #endif /* defined(TN3270) */
2132
2133 #if defined(TN3270)
2134 netin = ring_empty_count(&netiring);
2135 # else /* !defined(TN3270) */
2136 netin = !ISend && ring_empty_count(&netiring);
2137 # endif /* !defined(TN3270) */
2138
2139 netex = !SYNCHing;
2140
2141 /* If we have seen a signal recently, reset things */
2142
2143 if (scheduler_lockout_tty) {
2144 ttyin = ttyout = 0;
2145 }
2146
2147 # if defined(TN3270) && defined(unix)
2148 if (HaveInput) {
2149 HaveInput = 0;
2150 (void) signal(SIGIO, inputAvailable);
2151 }
2152 #endif /* defined(TN3270) && defined(unix) */
2153
2154 /* Call to system code to process rings */
2155
2156 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
2157
2158 /* Now, look at the input rings, looking for work to do. */
2159
2160 if (ring_full_count(&ttyiring)) {
2161 # if defined(TN3270)
2162 if (In3270) {
2163 int c;
2164
2165 c = DataFromTerminal(ttyiring.consume,
2166 ring_full_consecutive(&ttyiring));
2167 if (c) {
2168 returnValue = 1;
2169 ring_consumed(&ttyiring, c);
2170 }
2171 } else {
2172 # endif /* defined(TN3270) */
2173 returnValue |= telsnd();
2174 # if defined(TN3270)
2175 }
2176 # endif /* defined(TN3270) */
2177 }
2178
2179 if (ring_full_count(&netiring)) {
2180 # if !defined(TN3270)
2181 returnValue |= telrcv();
2182 # else /* !defined(TN3270) */
2183 returnValue = Push3270();
2184 # endif /* !defined(TN3270) */
2185 }
2186 return returnValue;
2187 }
2188
2189 /*
2190 * Select from tty and network...
2191 */
2192 void
telnet(user)2193 telnet(user)
2194 char *user;
2195 {
2196 int printed_encrypt = 0;
2197
2198 sys_telnet_init();
2199
2200 #if defined(AUTHENTICATION) || defined(ENCRYPTION)
2201 {
2202 static char local_host[256] = { 0 };
2203
2204 if (!local_host[0]) {
2205 gethostname(local_host, sizeof(local_host));
2206 local_host[sizeof(local_host)-1] = 0;
2207 }
2208 auth_encrypt_init(local_host, hostname, "TELNET", 0);
2209 auth_encrypt_user(user);
2210 }
2211 #endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */
2212 # if !defined(TN3270)
2213 if (telnetport) {
2214 #if defined(AUTHENTICATION)
2215 if (autologin)
2216 send_will(TELOPT_AUTHENTICATION, 1);
2217 #endif
2218 #if defined(ENCRYPTION)
2219 send_do(TELOPT_ENCRYPT, 1);
2220 send_will(TELOPT_ENCRYPT, 1);
2221 #endif
2222 send_do(TELOPT_SGA, 1);
2223 send_will(TELOPT_TTYPE, 1);
2224 send_will(TELOPT_NAWS, 1);
2225 send_will(TELOPT_TSPEED, 1);
2226 send_will(TELOPT_LFLOW, 1);
2227 send_will(TELOPT_LINEMODE, 1);
2228 send_will(TELOPT_NEW_ENVIRON, 1);
2229 send_do(TELOPT_STATUS, 1);
2230 if (env_getvalue((unsigned char *)"DISPLAY", 0))
2231 send_will(TELOPT_XDISPLOC, 1);
2232 if (binary)
2233 tel_enter_binary(binary);
2234 }
2235 # endif /* !defined(TN3270) */
2236
2237 #ifdef ENCRYPTION
2238 /*
2239 * Note: we assume a tie to the authentication option here. This
2240 * is necessary so that authentication fails, we don't spin
2241 * forever.
2242 */
2243 if (wantencryption) {
2244 extern int auth_has_failed;
2245 time_t timeout = time(0) + 60;
2246
2247 send_do(TELOPT_ENCRYPT, 1);
2248 send_will(TELOPT_ENCRYPT, 1);
2249 while (1) {
2250 if (my_want_state_is_wont(TELOPT_AUTHENTICATION)) {
2251 if (wantencryption == -1) {
2252 break;
2253 } else {
2254 printf("\nServer refused to negotiate authentication,");
2255 printf(" which is required for encryption.\n");
2256 Exit(1);
2257 }
2258 }
2259 if (auth_has_failed) {
2260 printf("\nAuthentication negotiation has failed,");
2261 printf(" which is required for encryption.\n");
2262 Exit(1);
2263 }
2264 if (my_want_state_is_dont(TELOPT_ENCRYPT) ||
2265 my_want_state_is_wont(TELOPT_ENCRYPT)) {
2266 printf("\nServer refused to negotiate encryption.\n");
2267 Exit(1);
2268 }
2269 if (encrypt_is_encrypting())
2270 break;
2271 if (time(0) > timeout) {
2272 printf("\nEncryption could not be enabled.\n");
2273 Exit(1);
2274 }
2275 if (printed_encrypt == 0) {
2276 printed_encrypt = 1;
2277 printf("Waiting for encryption to be negotiated...\n");
2278 /*
2279 * Turn on MODE_TRAPSIG and then turn off localchars
2280 * so that ^C will cause telnet to exit.
2281 */
2282 TerminalNewMode(getconnmode()|MODE_TRAPSIG);
2283 intr_waiting = 1;
2284 }
2285 if (intr_happened) {
2286 printf("\nUser interrupt.\n");
2287 Exit(1);
2288 }
2289 telnet_spin();
2290 }
2291 if (printed_encrypt) {
2292 printf("Encryption negotiated.\n");
2293 intr_waiting = 0;
2294 setconnmode(0);
2295 }
2296 }
2297 #endif
2298
2299 # if !defined(TN3270)
2300 for (;;) {
2301 int schedValue;
2302
2303 while ((schedValue = Scheduler(0)) != 0) {
2304 if (schedValue == -1) {
2305 setcommandmode();
2306 return;
2307 }
2308 }
2309
2310 if (Scheduler(1) == -1) {
2311 setcommandmode();
2312 return;
2313 }
2314 }
2315 # else /* !defined(TN3270) */
2316 for (;;) {
2317 int schedValue;
2318
2319 while (!In3270 && !shell_active) {
2320 if (Scheduler(1) == -1) {
2321 setcommandmode();
2322 return;
2323 }
2324 }
2325
2326 while ((schedValue = Scheduler(0)) != 0) {
2327 if (schedValue == -1) {
2328 setcommandmode();
2329 return;
2330 }
2331 }
2332 /* If there is data waiting to go out to terminal, don't
2333 * schedule any more data for the terminal.
2334 */
2335 if (ring_full_count(&ttyoring)) {
2336 schedValue = 1;
2337 } else {
2338 if (shell_active) {
2339 if (shell_continue() == 0) {
2340 ConnectScreen();
2341 }
2342 } else if (In3270) {
2343 schedValue = DoTerminalOutput();
2344 }
2345 }
2346 if (schedValue && (shell_active == 0)) {
2347 if (Scheduler(1) == -1) {
2348 setcommandmode();
2349 return;
2350 }
2351 }
2352 }
2353 # endif /* !defined(TN3270) */
2354 }
2355
2356 #if 0 /* XXX - this not being in is a bug */
2357 /*
2358 * nextitem()
2359 *
2360 * Return the address of the next "item" in the TELNET data
2361 * stream. This will be the address of the next character if
2362 * the current address is a user data character, or it will
2363 * be the address of the character following the TELNET command
2364 * if the current address is a TELNET IAC ("I Am a Command")
2365 * character.
2366 */
2367
2368 static char *
2369 nextitem(current)
2370 char *current;
2371 {
2372 if ((*current&0xff) != IAC) {
2373 return current+1;
2374 }
2375 switch (*(current+1)&0xff) {
2376 case DO:
2377 case DONT:
2378 case WILL:
2379 case WONT:
2380 return current+3;
2381 case SB: /* loop forever looking for the SE */
2382 {
2383 char *look = current+2;
2384
2385 for (;;) {
2386 if ((*look++&0xff) == IAC) {
2387 if ((*look++&0xff) == SE) {
2388 return look;
2389 }
2390 }
2391 }
2392 }
2393 default:
2394 return current+2;
2395 }
2396 }
2397 #endif /* 0 */
2398
2399 /*
2400 * netclear()
2401 *
2402 * We are about to do a TELNET SYNCH operation. Clear
2403 * the path to the network.
2404 *
2405 * Things are a bit tricky since we may have sent the first
2406 * byte or so of a previous TELNET command into the network.
2407 * So, we have to scan the network buffer from the beginning
2408 * until we are up to where we want to be.
2409 *
2410 * A side effect of what we do, just to keep things
2411 * simple, is to clear the urgent data pointer. The principal
2412 * caller should be setting the urgent data pointer AFTER calling
2413 * us in any case.
2414 */
2415
2416 static void
netclear()2417 netclear()
2418 {
2419 #if 0 /* XXX */
2420 char *thisitem, *next;
2421 char *good;
2422 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
2423 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
2424
2425 thisitem = netobuf;
2426
2427 while ((next = nextitem(thisitem)) <= netobuf.send) {
2428 thisitem = next;
2429 }
2430
2431 /* Now, thisitem is first before/at boundary. */
2432
2433 good = netobuf; /* where the good bytes go */
2434
2435 while (netoring.add > thisitem) {
2436 if (wewant(thisitem)) {
2437 int length;
2438
2439 next = thisitem;
2440 do {
2441 next = nextitem(next);
2442 } while (wewant(next) && (nfrontp > next));
2443 length = next-thisitem;
2444 memmove(good, thisitem, length);
2445 good += length;
2446 thisitem = next;
2447 } else {
2448 thisitem = nextitem(thisitem);
2449 }
2450 }
2451
2452 #endif /* 0 */
2453 }
2454
2455 /*
2456 * These routines add various telnet commands to the data stream.
2457 */
2458
2459 static void
doflush()2460 doflush()
2461 {
2462 NET2ADD(IAC, DO);
2463 NETADD(TELOPT_TM);
2464 flushline = 1;
2465 flushout = 1;
2466 (void) ttyflush(1); /* Flush/drop output */
2467 /* do printoption AFTER flush, otherwise the output gets tossed... */
2468 printoption("SENT", DO, TELOPT_TM);
2469 }
2470
2471 void
xmitAO()2472 xmitAO()
2473 {
2474 NET2ADD(IAC, AO);
2475 printoption("SENT", IAC, AO);
2476 if (autoflush) {
2477 doflush();
2478 }
2479 }
2480
2481
2482 void
xmitEL()2483 xmitEL()
2484 {
2485 NET2ADD(IAC, EL);
2486 printoption("SENT", IAC, EL);
2487 }
2488
2489 void
xmitEC()2490 xmitEC()
2491 {
2492 NET2ADD(IAC, EC);
2493 printoption("SENT", IAC, EC);
2494 }
2495
2496
2497 int
dosynch()2498 dosynch()
2499 {
2500 netclear(); /* clear the path to the network */
2501 NETADD(IAC);
2502 setneturg();
2503 NETADD(DM);
2504 printoption("SENT", IAC, DM);
2505 return 1;
2506 }
2507
2508 int want_status_response = 0;
2509
2510 int
get_status()2511 get_status()
2512 {
2513 unsigned char tmp[16];
2514 unsigned char *cp;
2515
2516 if (my_want_state_is_dont(TELOPT_STATUS)) {
2517 printf("Remote side does not support STATUS option\n");
2518 return 0;
2519 }
2520 cp = tmp;
2521
2522 *cp++ = IAC;
2523 *cp++ = SB;
2524 *cp++ = TELOPT_STATUS;
2525 *cp++ = TELQUAL_SEND;
2526 *cp++ = IAC;
2527 *cp++ = SE;
2528 if (NETROOM() >= cp - tmp) {
2529 ring_supply_data(&netoring, tmp, cp-tmp);
2530 printsub('>', tmp+2, cp - tmp - 2);
2531 }
2532 ++want_status_response;
2533 return 1;
2534 }
2535
2536 void
intp()2537 intp()
2538 {
2539 NET2ADD(IAC, IP);
2540 printoption("SENT", IAC, IP);
2541 flushline = 1;
2542 if (autoflush) {
2543 doflush();
2544 }
2545 if (autosynch) {
2546 dosynch();
2547 }
2548 }
2549
2550 void
sendbrk()2551 sendbrk()
2552 {
2553 NET2ADD(IAC, BREAK);
2554 printoption("SENT", IAC, BREAK);
2555 flushline = 1;
2556 if (autoflush) {
2557 doflush();
2558 }
2559 if (autosynch) {
2560 dosynch();
2561 }
2562 }
2563
2564 void
sendabort()2565 sendabort()
2566 {
2567 NET2ADD(IAC, ABORT);
2568 printoption("SENT", IAC, ABORT);
2569 flushline = 1;
2570 if (autoflush) {
2571 doflush();
2572 }
2573 if (autosynch) {
2574 dosynch();
2575 }
2576 }
2577
2578 void
sendsusp()2579 sendsusp()
2580 {
2581 NET2ADD(IAC, SUSP);
2582 printoption("SENT", IAC, SUSP);
2583 flushline = 1;
2584 if (autoflush) {
2585 doflush();
2586 }
2587 if (autosynch) {
2588 dosynch();
2589 }
2590 }
2591
2592 void
sendeof()2593 sendeof()
2594 {
2595 NET2ADD(IAC, xEOF);
2596 printoption("SENT", IAC, xEOF);
2597 }
2598
2599 void
sendayt()2600 sendayt()
2601 {
2602 NET2ADD(IAC, AYT);
2603 printoption("SENT", IAC, AYT);
2604 }
2605
2606 /*
2607 * Send a window size update to the remote system.
2608 */
2609
2610 void
sendnaws()2611 sendnaws()
2612 {
2613 long rows, cols;
2614 unsigned char tmp[16];
2615 unsigned char *cp;
2616
2617 if (my_state_is_wont(TELOPT_NAWS))
2618 return;
2619
2620 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \
2621 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; }
2622
2623 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */
2624 return;
2625 }
2626
2627 cp = tmp;
2628
2629 *cp++ = IAC;
2630 *cp++ = SB;
2631 *cp++ = TELOPT_NAWS;
2632 PUTSHORT(cp, cols);
2633 PUTSHORT(cp, rows);
2634 *cp++ = IAC;
2635 *cp++ = SE;
2636 if (NETROOM() >= cp - tmp) {
2637 ring_supply_data(&netoring, tmp, cp-tmp);
2638 printsub('>', tmp+2, cp - tmp - 2);
2639 }
2640 }
2641
2642 void
tel_enter_binary(rw)2643 tel_enter_binary(rw)
2644 int rw;
2645 {
2646 if (rw&1)
2647 send_do(TELOPT_BINARY, 1);
2648 if (rw&2)
2649 send_will(TELOPT_BINARY, 1);
2650 }
2651
2652 void
tel_leave_binary(rw)2653 tel_leave_binary(rw)
2654 int rw;
2655 {
2656 if (rw&1)
2657 send_dont(TELOPT_BINARY, 1);
2658 if (rw&2)
2659 send_wont(TELOPT_BINARY, 1);
2660 }
2661