Fix LINT build.
[dragonfly.git] / usr.bin / telnet / telnet.c
blob2fdcbae21a33056a14b320588444a9bfdb6f518e
1 /*
2 * Copyright (c) 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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.
33 * @(#)telnet.c 8.4 (Berkeley) 5/30/95
34 * $FreeBSD: src/crypto/telnet/telnet/telnet.c,v 1.4.2.5 2002/04/13 10:59:08 markm Exp $
35 * $DragonFly: src/crypto/telnet/telnet/telnet.c,v 1.3 2005/03/28 18:03:32 drhodus Exp $
38 #include <sys/types.h>
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.
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/telnet.h>
53 #include "ring.h"
55 #include "defines.h"
56 #include "externs.h"
57 #include "types.h"
58 #include "general.h"
60 #ifdef AUTHENTICATION
61 #include <libtelnet/auth.h>
62 #endif
63 #ifdef ENCRYPTION
64 #include <libtelnet/encrypt.h>
65 #endif
66 #include <libtelnet/misc.h>
68 #define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
70 static unsigned char subbuffer[SUBBUFSIZE],
71 *subpointer, *subend; /* buffer for sub-options */
72 #define SB_CLEAR() subpointer = subbuffer;
73 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
74 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
75 *subpointer++ = (c); \
78 #define SB_GET() ((*subpointer++)&0xff)
79 #define SB_PEEK() ((*subpointer)&0xff)
80 #define SB_EOF() (subpointer >= subend)
81 #define SB_LEN() (subend - subpointer)
83 char options[256]; /* The combined options */
84 char do_dont_resp[256];
85 char will_wont_resp[256];
87 int
88 eight = 0,
89 autologin = 0, /* Autologin anyone? */
90 skiprc = 0,
91 connected,
92 showoptions,
93 ISend, /* trying to send network data in */
94 debug = 0,
95 crmod,
96 netdata, /* Print out network data flow */
97 crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
98 telnetport,
99 SYNCHing, /* we are in TELNET SYNCH mode */
100 flushout, /* flush output */
101 autoflush = 0, /* flush output when interrupting? */
102 autosynch, /* send interrupt characters with SYNCH? */
103 localflow, /* we handle flow control locally */
104 restartany, /* if flow control enabled, restart on any character */
105 localchars, /* we recognize interrupt/quit */
106 donelclchars, /* the user has set "localchars" */
107 donebinarytoggle, /* the user has put us in binary */
108 dontlecho, /* do we suppress local echoing right now? */
109 globalmode,
110 doaddrlookup = 1, /* do a reverse address lookup? */
111 clienteof = 0;
113 char *prompt = 0;
114 #ifdef ENCRYPTION
115 char *line; /* hack around breakage in sra.c :-( !! */
116 #endif
118 cc_t escape;
119 cc_t rlogin;
120 #ifdef KLUDGELINEMODE
121 cc_t echoc;
122 #endif
125 * Telnet receiver states for fsm
127 #define TS_DATA 0
128 #define TS_IAC 1
129 #define TS_WILL 2
130 #define TS_WONT 3
131 #define TS_DO 4
132 #define TS_DONT 5
133 #define TS_CR 6
134 #define TS_SB 7 /* sub-option collection */
135 #define TS_SE 8 /* looking for sub-option end */
137 static int telrcv_state;
138 #ifdef OLD_ENVIRON
139 unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
140 #else
141 # define telopt_environ TELOPT_NEW_ENVIRON
142 #endif
144 jmp_buf toplevel;
145 jmp_buf peerdied;
147 int flushline;
148 int linemode;
150 #ifdef KLUDGELINEMODE
151 int kludgelinemode = 1;
152 #endif
154 static int is_unique(char *, char **, char **);
157 * The following are some clocks used to decide how to interpret
158 * the relationship between various variables.
161 Clocks clocks;
164 * Initialize telnet environment.
167 void
168 init_telnet(void)
170 env_init();
172 SB_CLEAR();
173 ClearArray(options);
175 connected = ISend = localflow = donebinarytoggle = 0;
176 #ifdef AUTHENTICATION
177 #ifdef ENCRYPTION
178 auth_encrypt_connect(connected);
179 #endif
180 #endif
181 restartany = -1;
183 SYNCHing = 0;
185 /* Don't change NetTrace */
187 escape = CONTROL(']');
188 rlogin = _POSIX_VDISABLE;
189 #ifdef KLUDGELINEMODE
190 echoc = CONTROL('E');
191 #endif
193 flushline = 1;
194 telrcv_state = TS_DATA;
199 * These routines are in charge of sending option negotiations
200 * to the other side.
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.
206 void
207 send_do(int c, int init)
209 if (init) {
210 if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
211 my_want_state_is_do(c))
212 return;
213 set_my_want_state_do(c);
214 do_dont_resp[c]++;
216 NET2ADD(IAC, DO);
217 NETADD(c);
218 printoption("SENT", DO, c);
221 void
222 send_dont(int c, int init)
224 if (init) {
225 if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
226 my_want_state_is_dont(c))
227 return;
228 set_my_want_state_dont(c);
229 do_dont_resp[c]++;
231 NET2ADD(IAC, DONT);
232 NETADD(c);
233 printoption("SENT", DONT, c);
236 void
237 send_will(int c, int init)
239 if (init) {
240 if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
241 my_want_state_is_will(c))
242 return;
243 set_my_want_state_will(c);
244 will_wont_resp[c]++;
246 NET2ADD(IAC, WILL);
247 NETADD(c);
248 printoption("SENT", WILL, c);
251 void
252 send_wont(int c, int init)
254 if (init) {
255 if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
256 my_want_state_is_wont(c))
257 return;
258 set_my_want_state_wont(c);
259 will_wont_resp[c]++;
261 NET2ADD(IAC, WONT);
262 NETADD(c);
263 printoption("SENT", WONT, c);
266 void
267 willoption(int option)
269 int new_state_ok = 0;
271 if (do_dont_resp[option]) {
272 --do_dont_resp[option];
273 if (do_dont_resp[option] && my_state_is_do(option))
274 --do_dont_resp[option];
277 if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
279 switch (option) {
281 case TELOPT_ECHO:
282 case TELOPT_BINARY:
283 case TELOPT_SGA:
284 settimer(modenegotiated);
285 /* FALL THROUGH */
286 case TELOPT_STATUS:
287 #ifdef AUTHENTICATION
288 case TELOPT_AUTHENTICATION:
289 #endif
290 #ifdef ENCRYPTION
291 case TELOPT_ENCRYPT:
292 #endif /* ENCRYPTION */
293 new_state_ok = 1;
294 break;
296 case TELOPT_TM:
297 if (flushout)
298 flushout = 0;
300 * Special case for TM. If we get back a WILL,
301 * pretend we got back a WONT.
303 set_my_want_state_dont(option);
304 set_my_state_dont(option);
305 return; /* Never reply to TM will's/wont's */
307 case TELOPT_LINEMODE:
308 default:
309 break;
312 if (new_state_ok) {
313 set_my_want_state_do(option);
314 send_do(option, 0);
315 setconnmode(0); /* possibly set new tty mode */
316 } else {
317 do_dont_resp[option]++;
318 send_dont(option, 0);
321 set_my_state_do(option);
322 #ifdef ENCRYPTION
323 if (option == TELOPT_ENCRYPT)
324 encrypt_send_support();
325 #endif /* ENCRYPTION */
328 void
329 wontoption(int option)
331 if (do_dont_resp[option]) {
332 --do_dont_resp[option];
333 if (do_dont_resp[option] && my_state_is_dont(option))
334 --do_dont_resp[option];
337 if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
339 switch (option) {
341 #ifdef KLUDGELINEMODE
342 case TELOPT_SGA:
343 if (!kludgelinemode)
344 break;
345 /* FALL THROUGH */
346 #endif
347 case TELOPT_ECHO:
348 settimer(modenegotiated);
349 break;
351 case TELOPT_TM:
352 if (flushout)
353 flushout = 0;
354 set_my_want_state_dont(option);
355 set_my_state_dont(option);
356 return; /* Never reply to TM will's/wont's */
358 default:
359 break;
361 set_my_want_state_dont(option);
362 if (my_state_is_do(option))
363 send_dont(option, 0);
364 setconnmode(0); /* Set new tty mode */
365 } else if (option == TELOPT_TM) {
367 * Special case for TM.
369 if (flushout)
370 flushout = 0;
371 set_my_want_state_dont(option);
373 set_my_state_dont(option);
376 static void
377 dooption(int option)
379 int new_state_ok = 0;
381 if (will_wont_resp[option]) {
382 --will_wont_resp[option];
383 if (will_wont_resp[option] && my_state_is_will(option))
384 --will_wont_resp[option];
387 if (will_wont_resp[option] == 0) {
388 if (my_want_state_is_wont(option)) {
390 switch (option) {
392 case TELOPT_TM:
394 * Special case for TM. We send a WILL, but pretend
395 * we sent WONT.
397 send_will(option, 0);
398 set_my_want_state_wont(TELOPT_TM);
399 set_my_state_wont(TELOPT_TM);
400 return;
402 case TELOPT_BINARY: /* binary mode */
403 case TELOPT_NAWS: /* window size */
404 case TELOPT_TSPEED: /* terminal speed */
405 case TELOPT_LFLOW: /* local flow control */
406 case TELOPT_TTYPE: /* terminal type option */
407 case TELOPT_SGA: /* no big deal */
408 #ifdef ENCRYPTION
409 case TELOPT_ENCRYPT: /* encryption variable option */
410 #endif /* ENCRYPTION */
411 new_state_ok = 1;
412 break;
414 case TELOPT_NEW_ENVIRON: /* New environment variable option */
415 #ifdef OLD_ENVIRON
416 if (my_state_is_will(TELOPT_OLD_ENVIRON))
417 send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */
418 goto env_common;
419 case TELOPT_OLD_ENVIRON: /* Old environment variable option */
420 if (my_state_is_will(TELOPT_NEW_ENVIRON))
421 break; /* Don't enable if new one is in use! */
422 env_common:
423 telopt_environ = option;
424 #endif
425 new_state_ok = 1;
426 break;
428 #ifdef AUTHENTICATION
429 case TELOPT_AUTHENTICATION:
430 if (autologin)
431 new_state_ok = 1;
432 break;
433 #endif
435 case TELOPT_XDISPLOC: /* X Display location */
436 if (env_getvalue("DISPLAY"))
437 new_state_ok = 1;
438 break;
440 case TELOPT_LINEMODE:
441 #ifdef KLUDGELINEMODE
442 kludgelinemode = 0;
443 send_do(TELOPT_SGA, 1);
444 #endif
445 set_my_want_state_will(TELOPT_LINEMODE);
446 send_will(option, 0);
447 set_my_state_will(TELOPT_LINEMODE);
448 slc_init();
449 return;
451 case TELOPT_ECHO: /* We're never going to echo... */
452 default:
453 break;
456 if (new_state_ok) {
457 set_my_want_state_will(option);
458 send_will(option, 0);
459 setconnmode(0); /* Set new tty mode */
460 } else {
461 will_wont_resp[option]++;
462 send_wont(option, 0);
464 } else {
466 * Handle options that need more things done after the
467 * other side has acknowledged the option.
469 switch (option) {
470 case TELOPT_LINEMODE:
471 #ifdef KLUDGELINEMODE
472 kludgelinemode = 0;
473 send_do(TELOPT_SGA, 1);
474 #endif
475 set_my_state_will(option);
476 slc_init();
477 send_do(TELOPT_SGA, 0);
478 return;
482 set_my_state_will(option);
485 static void
486 dontoption(int option)
489 if (will_wont_resp[option]) {
490 --will_wont_resp[option];
491 if (will_wont_resp[option] && my_state_is_wont(option))
492 --will_wont_resp[option];
495 if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
496 switch (option) {
497 case TELOPT_LINEMODE:
498 linemode = 0; /* put us back to the default state */
499 break;
500 #ifdef OLD_ENVIRON
501 case TELOPT_NEW_ENVIRON:
503 * The new environ option wasn't recognized, try
504 * the old one.
506 send_will(TELOPT_OLD_ENVIRON, 1);
507 telopt_environ = TELOPT_OLD_ENVIRON;
508 break;
509 #endif
511 /* we always accept a DONT */
512 set_my_want_state_wont(option);
513 if (my_state_is_will(option))
514 send_wont(option, 0);
515 setconnmode(0); /* Set new tty mode */
517 set_my_state_wont(option);
521 * Given a buffer returned by tgetent(), this routine will turn
522 * the pipe separated list of names in the buffer into an array
523 * of pointers to null terminated names. We toss out any bad,
524 * duplicate, or verbose names (names with spaces).
527 static const char *name_unknown = "UNKNOWN";
528 static const char *unknown[] = { NULL, NULL };
530 static const char **
531 mklist(char *buf, char *name)
533 int n;
534 char c, *cp, **argvp, *cp2, **argv, **avt;
536 if (name) {
537 if (strlen(name) > 40) {
538 name = 0;
539 unknown[0] = name_unknown;
540 } else {
541 unknown[0] = name;
542 upcase(name);
544 } else
545 unknown[0] = name_unknown;
547 * Count up the number of names.
549 for (n = 1, cp = buf; *cp && *cp != ':'; cp++) {
550 if (*cp == '|')
551 n++;
554 * Allocate an array to put the name pointers into
556 argv = (char **)malloc((n+3)*sizeof(char *));
557 if (argv == 0)
558 return(unknown);
561 * Fill up the array of pointers to names.
563 *argv = 0;
564 argvp = argv+1;
565 n = 0;
566 for (cp = cp2 = buf; (c = *cp); cp++) {
567 if (c == '|' || c == ':') {
568 *cp++ = '\0';
570 * Skip entries that have spaces or are over 40
571 * characters long. If this is our environment
572 * name, then put it up front. Otherwise, as
573 * long as this is not a duplicate name (case
574 * insensitive) add it to the list.
576 if (n || (cp - cp2 > 41))
578 else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
579 *argv = cp2;
580 else if (is_unique(cp2, argv+1, argvp))
581 *argvp++ = cp2;
582 if (c == ':')
583 break;
585 * Skip multiple delimiters. Reset cp2 to
586 * the beginning of the next name. Reset n,
587 * the flag for names with spaces.
589 while ((c = *cp) == '|')
590 cp++;
591 cp2 = cp;
592 n = 0;
595 * Skip entries with spaces or non-ascii values.
596 * Convert lower case letters to upper case.
598 if ((c == ' ') || !isascii(c))
599 n = 1;
600 else if (islower(c))
601 *cp = toupper(c);
605 * Check for an old V6 2 character name. If the second
606 * name points to the beginning of the buffer, and is
607 * only 2 characters long, move it to the end of the array.
609 if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
610 --argvp;
611 for (avt = &argv[1]; avt < argvp; avt++)
612 *avt = *(avt+1);
613 *argvp++ = buf;
617 * Duplicate last name, for TTYPE option, and null
618 * terminate the array. If we didn't find a match on
619 * our terminal name, put that name at the beginning.
621 cp = *(argvp-1);
622 *argvp++ = cp;
623 *argvp = 0;
625 if (*argv == 0) {
626 if (name)
627 *argv = name;
628 else {
629 --argvp;
630 for (avt = argv; avt < argvp; avt++)
631 *avt = *(avt+1);
634 if (*argv)
635 return((const char **)argv);
636 else
637 return(unknown);
640 static int
641 is_unique(char *name, char **as, char **ae)
643 char **ap;
644 int n;
646 n = strlen(name) + 1;
647 for (ap = as; ap < ae; ap++)
648 if (strncasecmp(*ap, name, n) == 0)
649 return(0);
650 return (1);
653 #ifdef TERMCAP
654 char termbuf[1024];
656 /*ARGSUSED*/
657 static int
658 setupterm(char *tname, int fd, int *errp)
660 if (tgetent(termbuf, tname) == 1) {
661 termbuf[1023] = '\0';
662 if (errp)
663 *errp = 1;
664 return(0);
666 if (errp)
667 *errp = 0;
668 return(-1);
670 #else
671 #define termbuf ttytype
672 extern char ttytype[];
673 #endif
675 int resettermname = 1;
677 static const char *
678 gettermname(void)
680 char *tname;
681 static const char **tnamep = 0;
682 static const char **next;
683 int err;
685 if (resettermname) {
686 resettermname = 0;
687 if (tnamep && tnamep != unknown)
688 free(tnamep);
689 if ((tname = env_getvalue("TERM")) &&
690 (setupterm(tname, 1, &err) == 0)) {
691 tnamep = mklist(termbuf, tname);
692 } else {
693 if (tname && (strlen(tname) <= 40)) {
694 unknown[0] = tname;
695 upcase(tname);
696 } else
697 unknown[0] = name_unknown;
698 tnamep = unknown;
700 next = tnamep;
702 if (*next == 0)
703 next = tnamep;
704 return(*next++);
707 * suboption()
709 * Look at the sub-option buffer, and try to be helpful to the other
710 * side.
712 * Currently we recognize:
714 * Terminal type, send request.
715 * Terminal speed (send request).
716 * Local flow control (is request).
717 * Linemode
720 static void
721 suboption(void)
723 unsigned char subchar;
725 printsub('<', subbuffer, SB_LEN()+2);
726 switch (subchar = SB_GET()) {
727 case TELOPT_TTYPE:
728 if (my_want_state_is_wont(TELOPT_TTYPE))
729 return;
730 if (SB_EOF() || SB_GET() != TELQUAL_SEND) {
731 return;
732 } else {
733 const char *name;
734 unsigned char temp[50];
735 int len;
737 name = gettermname();
738 len = strlen(name) + 4 + 2;
739 if (len < NETROOM()) {
740 sprintf(temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
741 TELQUAL_IS, name, IAC, SE);
742 ring_supply_data(&netoring, temp, len);
743 printsub('>', &temp[2], len-2);
744 } else {
745 ExitString("No room in buffer for terminal type.\n", 1);
746 /*NOTREACHED*/
749 break;
750 case TELOPT_TSPEED:
751 if (my_want_state_is_wont(TELOPT_TSPEED))
752 return;
753 if (SB_EOF())
754 return;
755 if (SB_GET() == TELQUAL_SEND) {
756 long ospeed, ispeed;
757 unsigned char temp[50];
758 int len;
760 TerminalSpeeds(&ispeed, &ospeed);
762 sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED,
763 TELQUAL_IS, ospeed, ispeed, IAC, SE);
764 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
766 if (len < NETROOM()) {
767 ring_supply_data(&netoring, temp, len);
768 printsub('>', temp+2, len - 2);
770 /*@*/ else printf("lm_will: not enough room in buffer\n");
772 break;
773 case TELOPT_LFLOW:
774 if (my_want_state_is_wont(TELOPT_LFLOW))
775 return;
776 if (SB_EOF())
777 return;
778 switch(SB_GET()) {
779 case LFLOW_RESTART_ANY:
780 restartany = 1;
781 break;
782 case LFLOW_RESTART_XON:
783 restartany = 0;
784 break;
785 case LFLOW_ON:
786 localflow = 1;
787 break;
788 case LFLOW_OFF:
789 localflow = 0;
790 break;
791 default:
792 return;
794 setcommandmode();
795 setconnmode(0);
796 break;
798 case TELOPT_LINEMODE:
799 if (my_want_state_is_wont(TELOPT_LINEMODE))
800 return;
801 if (SB_EOF())
802 return;
803 switch (SB_GET()) {
804 case WILL:
805 lm_will(subpointer, SB_LEN());
806 break;
807 case WONT:
808 lm_wont(subpointer, SB_LEN());
809 break;
810 case DO:
811 lm_do(subpointer, SB_LEN());
812 break;
813 case DONT:
814 lm_dont(subpointer, SB_LEN());
815 break;
816 case LM_SLC:
817 slc(subpointer, SB_LEN());
818 break;
819 case LM_MODE:
820 lm_mode(subpointer, SB_LEN(), 0);
821 break;
822 default:
823 break;
825 break;
827 #ifdef OLD_ENVIRON
828 case TELOPT_OLD_ENVIRON:
829 #endif
830 case TELOPT_NEW_ENVIRON:
831 if (SB_EOF())
832 return;
833 switch(SB_PEEK()) {
834 case TELQUAL_IS:
835 case TELQUAL_INFO:
836 if (my_want_state_is_dont(subchar))
837 return;
838 break;
839 case TELQUAL_SEND:
840 if (my_want_state_is_wont(subchar)) {
841 return;
843 break;
844 default:
845 return;
847 env_opt(subpointer, SB_LEN());
848 break;
850 case TELOPT_XDISPLOC:
851 if (my_want_state_is_wont(TELOPT_XDISPLOC))
852 return;
853 if (SB_EOF())
854 return;
855 if (SB_GET() == TELQUAL_SEND) {
856 unsigned char temp[50], *dp;
857 int len;
859 if ((dp = env_getvalue("DISPLAY")) == NULL ||
860 strlen(dp) > sizeof(temp) - 7) {
862 * Something happened, we no longer have a DISPLAY
863 * variable. Or it is too long. So, turn off the option.
865 send_wont(TELOPT_XDISPLOC, 1);
866 break;
868 snprintf(temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB,
869 TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE);
870 len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
872 if (len < NETROOM()) {
873 ring_supply_data(&netoring, temp, len);
874 printsub('>', temp+2, len - 2);
876 /*@*/ else printf("lm_will: not enough room in buffer\n");
878 break;
880 #ifdef AUTHENTICATION
881 case TELOPT_AUTHENTICATION: {
882 if (!autologin)
883 break;
884 if (SB_EOF())
885 return;
886 switch(SB_GET()) {
887 case TELQUAL_IS:
888 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
889 return;
890 auth_is(subpointer, SB_LEN());
891 break;
892 case TELQUAL_SEND:
893 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
894 return;
895 auth_send(subpointer, SB_LEN());
896 break;
897 case TELQUAL_REPLY:
898 if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
899 return;
900 auth_reply(subpointer, SB_LEN());
901 break;
902 case TELQUAL_NAME:
903 if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
904 return;
905 auth_name(subpointer, SB_LEN());
906 break;
909 break;
910 #endif
911 #ifdef ENCRYPTION
912 case TELOPT_ENCRYPT:
913 if (SB_EOF())
914 return;
915 switch(SB_GET()) {
916 case ENCRYPT_START:
917 if (my_want_state_is_dont(TELOPT_ENCRYPT))
918 return;
919 encrypt_start(subpointer, SB_LEN());
920 break;
921 case ENCRYPT_END:
922 if (my_want_state_is_dont(TELOPT_ENCRYPT))
923 return;
924 encrypt_end();
925 break;
926 case ENCRYPT_SUPPORT:
927 if (my_want_state_is_wont(TELOPT_ENCRYPT))
928 return;
929 encrypt_support(subpointer, SB_LEN());
930 break;
931 case ENCRYPT_REQSTART:
932 if (my_want_state_is_wont(TELOPT_ENCRYPT))
933 return;
934 encrypt_request_start(subpointer, SB_LEN());
935 break;
936 case ENCRYPT_REQEND:
937 if (my_want_state_is_wont(TELOPT_ENCRYPT))
938 return;
940 * We can always send an REQEND so that we cannot
941 * get stuck encrypting. We should only get this
942 * if we have been able to get in the correct mode
943 * anyhow.
945 encrypt_request_end();
946 break;
947 case ENCRYPT_IS:
948 if (my_want_state_is_dont(TELOPT_ENCRYPT))
949 return;
950 encrypt_is(subpointer, SB_LEN());
951 break;
952 case ENCRYPT_REPLY:
953 if (my_want_state_is_wont(TELOPT_ENCRYPT))
954 return;
955 encrypt_reply(subpointer, SB_LEN());
956 break;
957 case ENCRYPT_ENC_KEYID:
958 if (my_want_state_is_dont(TELOPT_ENCRYPT))
959 return;
960 encrypt_enc_keyid(subpointer, SB_LEN());
961 break;
962 case ENCRYPT_DEC_KEYID:
963 if (my_want_state_is_wont(TELOPT_ENCRYPT))
964 return;
965 encrypt_dec_keyid(subpointer, SB_LEN());
966 break;
967 default:
968 break;
970 break;
971 #endif /* ENCRYPTION */
972 default:
973 break;
977 static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
979 void
980 lm_will(unsigned char *cmd, int len)
982 if (len < 1) {
983 /*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */
984 return;
986 switch(cmd[0]) {
987 case LM_FORWARDMASK: /* We shouldn't ever get this... */
988 default:
989 str_lm[3] = DONT;
990 str_lm[4] = cmd[0];
991 if (NETROOM() > (int)sizeof(str_lm)) {
992 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
993 printsub('>', &str_lm[2], sizeof(str_lm)-2);
995 /*@*/ else printf("lm_will: not enough room in buffer\n");
996 break;
1000 void
1001 lm_wont(unsigned char *cmd, int len)
1003 if (len < 1) {
1004 /*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */
1005 return;
1007 switch(cmd[0]) {
1008 case LM_FORWARDMASK: /* We shouldn't ever get this... */
1009 default:
1010 /* We are always DONT, so don't respond */
1011 return;
1015 void
1016 lm_do(unsigned char *cmd, int len)
1018 if (len < 1) {
1019 /*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */
1020 return;
1022 switch(cmd[0]) {
1023 case LM_FORWARDMASK:
1024 default:
1025 str_lm[3] = WONT;
1026 str_lm[4] = cmd[0];
1027 if (NETROOM() > (int)sizeof(str_lm)) {
1028 ring_supply_data(&netoring, str_lm, sizeof(str_lm));
1029 printsub('>', &str_lm[2], sizeof(str_lm)-2);
1031 /*@*/ else printf("lm_do: not enough room in buffer\n");
1032 break;
1036 void
1037 lm_dont(unsigned char *cmd, int len)
1039 if (len < 1) {
1040 /*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */
1041 return;
1043 switch(cmd[0]) {
1044 case LM_FORWARDMASK:
1045 default:
1046 /* we are always WONT, so don't respond */
1047 break;
1051 static unsigned char str_lm_mode[] = {
1052 IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE
1055 void
1056 lm_mode(unsigned char *cmd, int len, int init)
1058 if (len != 1)
1059 return;
1060 if ((linemode&MODE_MASK&~MODE_ACK) == *cmd)
1061 return;
1062 if (*cmd&MODE_ACK)
1063 return;
1064 linemode = *cmd&(MODE_MASK&~MODE_ACK);
1065 str_lm_mode[4] = linemode;
1066 if (!init)
1067 str_lm_mode[4] |= MODE_ACK;
1068 if (NETROOM() > (int)sizeof(str_lm_mode)) {
1069 ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode));
1070 printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2);
1072 /*@*/ else printf("lm_mode: not enough room in buffer\n");
1073 setconnmode(0); /* set changed mode */
1079 * slc()
1080 * Handle special character suboption of LINEMODE.
1083 struct spc {
1084 cc_t val;
1085 cc_t *valp;
1086 char flags; /* Current flags & level */
1087 char mylevel; /* Maximum level & flags */
1088 } spc_data[NSLC+1];
1090 #define SLC_IMPORT 0
1091 #define SLC_EXPORT 1
1092 #define SLC_RVALUE 2
1093 static int slc_mode = SLC_EXPORT;
1095 void
1096 slc_init(void)
1098 struct spc *spcp;
1100 localchars = 1;
1101 for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
1102 spcp->val = 0;
1103 spcp->valp = 0;
1104 spcp->flags = spcp->mylevel = SLC_NOSUPPORT;
1107 #define initfunc(func, flags) { \
1108 spcp = &spc_data[func]; \
1109 if ((spcp->valp = tcval(func))) { \
1110 spcp->val = *spcp->valp; \
1111 spcp->mylevel = SLC_VARIABLE|flags; \
1112 } else { \
1113 spcp->val = 0; \
1114 spcp->mylevel = SLC_DEFAULT; \
1118 initfunc(SLC_SYNCH, 0);
1119 /* No BRK */
1120 initfunc(SLC_AO, 0);
1121 initfunc(SLC_AYT, 0);
1122 /* No EOR */
1123 initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT);
1124 initfunc(SLC_EOF, 0);
1125 #ifndef SYSV_TERMIO
1126 initfunc(SLC_SUSP, SLC_FLUSHIN);
1127 #endif
1128 initfunc(SLC_EC, 0);
1129 initfunc(SLC_EL, 0);
1130 #ifndef SYSV_TERMIO
1131 initfunc(SLC_EW, 0);
1132 initfunc(SLC_RP, 0);
1133 initfunc(SLC_LNEXT, 0);
1134 #endif
1135 initfunc(SLC_XON, 0);
1136 initfunc(SLC_XOFF, 0);
1137 #ifdef SYSV_TERMIO
1138 spc_data[SLC_XON].mylevel = SLC_CANTCHANGE;
1139 spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE;
1140 #endif
1141 initfunc(SLC_FORW1, 0);
1142 #ifdef USE_TERMIO
1143 initfunc(SLC_FORW2, 0);
1144 /* No FORW2 */
1145 #endif
1147 initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT);
1148 #undef initfunc
1150 if (slc_mode == SLC_EXPORT)
1151 slc_export();
1152 else
1153 slc_import(1);
1157 void
1158 slcstate(void)
1160 printf("Special characters are %s values\n",
1161 slc_mode == SLC_IMPORT ? "remote default" :
1162 slc_mode == SLC_EXPORT ? "local" :
1163 "remote");
1166 void
1167 slc_mode_export(void)
1169 slc_mode = SLC_EXPORT;
1170 if (my_state_is_will(TELOPT_LINEMODE))
1171 slc_export();
1174 void
1175 slc_mode_import(int def)
1177 slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
1178 if (my_state_is_will(TELOPT_LINEMODE))
1179 slc_import(def);
1182 unsigned char slc_import_val[] = {
1183 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
1185 unsigned char slc_import_def[] = {
1186 IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
1189 void
1190 slc_import(int def)
1192 if (NETROOM() > (int)sizeof(slc_import_val)) {
1193 if (def) {
1194 ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def));
1195 printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2);
1196 } else {
1197 ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val));
1198 printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2);
1201 /*@*/ else printf("slc_import: not enough room\n");
1204 void
1205 slc_export(void)
1207 struct spc *spcp;
1209 TerminalDefaultChars();
1211 slc_start_reply();
1212 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1213 if (spcp->mylevel != SLC_NOSUPPORT) {
1214 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1215 spcp->flags = SLC_NOSUPPORT;
1216 else
1217 spcp->flags = spcp->mylevel;
1218 if (spcp->valp)
1219 spcp->val = *spcp->valp;
1220 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1223 slc_end_reply();
1224 (void)slc_update();
1225 setconnmode(1); /* Make sure the character values are set */
1228 void
1229 slc(unsigned char *cp, int len)
1231 struct spc *spcp;
1232 int func,level;
1234 slc_start_reply();
1236 for (; len >= 3; len -=3, cp +=3) {
1238 func = cp[SLC_FUNC];
1240 if (func == 0) {
1242 * Client side: always ignore 0 function.
1244 continue;
1246 if (func > NSLC) {
1247 if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT)
1248 slc_add_reply(func, SLC_NOSUPPORT, 0);
1249 continue;
1252 spcp = &spc_data[func];
1254 level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK);
1256 if ((cp[SLC_VALUE] == (unsigned char)spcp->val) &&
1257 ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) {
1258 continue;
1261 if (level == (SLC_DEFAULT|SLC_ACK)) {
1263 * This is an error condition, the SLC_ACK
1264 * bit should never be set for the SLC_DEFAULT
1265 * level. Our best guess to recover is to
1266 * ignore the SLC_ACK bit.
1268 cp[SLC_FLAGS] &= ~SLC_ACK;
1271 if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) {
1272 spcp->val = (cc_t)cp[SLC_VALUE];
1273 spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */
1274 continue;
1277 level &= ~SLC_ACK;
1279 if (level <= (spcp->mylevel&SLC_LEVELBITS)) {
1280 spcp->flags = cp[SLC_FLAGS]|SLC_ACK;
1281 spcp->val = (cc_t)cp[SLC_VALUE];
1283 if (level == SLC_DEFAULT) {
1284 if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT)
1285 spcp->flags = spcp->mylevel;
1286 else
1287 spcp->flags = SLC_NOSUPPORT;
1289 slc_add_reply(func, spcp->flags, spcp->val);
1291 slc_end_reply();
1292 if (slc_update())
1293 setconnmode(1); /* set the new character values */
1296 void
1297 slc_check(void)
1299 struct spc *spcp;
1301 slc_start_reply();
1302 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1303 if (spcp->valp && spcp->val != *spcp->valp) {
1304 spcp->val = *spcp->valp;
1305 if (spcp->val == (cc_t)(_POSIX_VDISABLE))
1306 spcp->flags = SLC_NOSUPPORT;
1307 else
1308 spcp->flags = spcp->mylevel;
1309 slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
1312 slc_end_reply();
1313 setconnmode(1);
1316 unsigned char slc_reply[128];
1317 unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
1318 unsigned char *slc_replyp;
1320 void
1321 slc_start_reply(void)
1323 slc_replyp = slc_reply;
1324 *slc_replyp++ = IAC;
1325 *slc_replyp++ = SB;
1326 *slc_replyp++ = TELOPT_LINEMODE;
1327 *slc_replyp++ = LM_SLC;
1330 void
1331 slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
1333 /* A sequence of up to 6 bytes my be written for this member of the SLC
1334 * suboption list by this function. The end of negotiation command,
1335 * which is written by slc_end_reply(), will require 2 additional
1336 * bytes. Do not proceed unless there is sufficient space for these
1337 * items.
1339 if (&slc_replyp[6+2] > slc_reply_eom)
1340 return;
1341 if ((*slc_replyp++ = func) == IAC)
1342 *slc_replyp++ = IAC;
1343 if ((*slc_replyp++ = flags) == IAC)
1344 *slc_replyp++ = IAC;
1345 if ((*slc_replyp++ = (unsigned char)value) == IAC)
1346 *slc_replyp++ = IAC;
1349 void
1350 slc_end_reply(void)
1352 int len;
1353 /* The end of negotiation command requires 2 bytes. */
1354 if (&slc_replyp[2] > slc_reply_eom)
1355 return;
1356 *slc_replyp++ = IAC;
1357 *slc_replyp++ = SE;
1358 len = slc_replyp - slc_reply;
1359 if (len <= 6)
1360 return;
1361 if (NETROOM() > len) {
1362 ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply);
1363 printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2);
1365 /*@*/else printf("slc_end_reply: not enough room\n");
1369 slc_update(void)
1371 struct spc *spcp;
1372 int need_update = 0;
1374 for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
1375 if (!(spcp->flags&SLC_ACK))
1376 continue;
1377 spcp->flags &= ~SLC_ACK;
1378 if (spcp->valp && (*spcp->valp != spcp->val)) {
1379 *spcp->valp = spcp->val;
1380 need_update = 1;
1383 return(need_update);
1386 #ifdef OLD_ENVIRON
1387 # ifdef ENV_HACK
1389 * Earlier version of telnet/telnetd from the BSD code had
1390 * the definitions of VALUE and VAR reversed. To ensure
1391 * maximum interoperability, we assume that the server is
1392 * an older BSD server, until proven otherwise. The newer
1393 * BSD servers should be able to handle either definition,
1394 * so it is better to use the wrong values if we don't
1395 * know what type of server it is.
1397 int env_auto = 1;
1398 int old_env_var = OLD_ENV_VAR;
1399 int old_env_value = OLD_ENV_VALUE;
1400 # else
1401 # define old_env_var OLD_ENV_VAR
1402 # define old_env_value OLD_ENV_VALUE
1403 # endif
1404 #endif
1406 void
1407 env_opt(unsigned char *buf, int len)
1409 unsigned char *ep = 0, *epc = 0;
1410 int i;
1412 switch(buf[0]&0xff) {
1413 case TELQUAL_SEND:
1414 env_opt_start();
1415 if (len == 1) {
1416 env_opt_add(NULL);
1417 } else for (i = 1; i < len; i++) {
1418 switch (buf[i]&0xff) {
1419 #ifdef OLD_ENVIRON
1420 case OLD_ENV_VAR:
1421 # ifdef ENV_HACK
1422 if (telopt_environ == TELOPT_OLD_ENVIRON
1423 && env_auto) {
1424 /* Server has the same definitions */
1425 old_env_var = OLD_ENV_VAR;
1426 old_env_value = OLD_ENV_VALUE;
1428 /* FALL THROUGH */
1429 # endif
1430 case OLD_ENV_VALUE:
1432 * Although OLD_ENV_VALUE is not legal, we will
1433 * still recognize it, just in case it is an
1434 * old server that has VAR & VALUE mixed up...
1436 /* FALL THROUGH */
1437 #else
1438 case NEW_ENV_VAR:
1439 #endif
1440 case ENV_USERVAR:
1441 if (ep) {
1442 *epc = 0;
1443 env_opt_add(ep);
1445 ep = epc = &buf[i+1];
1446 break;
1447 case ENV_ESC:
1448 i++;
1449 /*FALL THROUGH*/
1450 default:
1451 if (epc)
1452 *epc++ = buf[i];
1453 break;
1456 if (ep) {
1457 *epc = 0;
1458 env_opt_add(ep);
1460 env_opt_end(1);
1461 break;
1463 case TELQUAL_IS:
1464 case TELQUAL_INFO:
1465 /* Ignore for now. We shouldn't get it anyway. */
1466 break;
1468 default:
1469 break;
1473 #define OPT_REPLY_SIZE (2 * SUBBUFSIZE)
1474 unsigned char *opt_reply = NULL;
1475 unsigned char *opt_replyp;
1476 unsigned char *opt_replyend;
1478 void
1479 env_opt_start(void)
1481 if (opt_reply)
1482 opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE);
1483 else
1484 opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE);
1485 if (opt_reply == NULL) {
1486 /*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n");
1487 opt_reply = opt_replyp = opt_replyend = NULL;
1488 return;
1490 opt_replyp = opt_reply;
1491 opt_replyend = opt_reply + OPT_REPLY_SIZE;
1492 *opt_replyp++ = IAC;
1493 *opt_replyp++ = SB;
1494 *opt_replyp++ = telopt_environ;
1495 *opt_replyp++ = TELQUAL_IS;
1498 void
1499 env_opt_start_info(void)
1501 env_opt_start();
1502 if (opt_replyp)
1503 opt_replyp[-1] = TELQUAL_INFO;
1506 void
1507 env_opt_add(unsigned char *ep)
1509 unsigned char *vp, c;
1511 if (opt_reply == NULL) /*XXX*/
1512 return; /*XXX*/
1514 if (ep == NULL || *ep == '\0') {
1515 /* Send user defined variables first. */
1516 env_default(1, 0);
1517 while ((ep = env_default(0, 0)))
1518 env_opt_add(ep);
1520 /* Now add the list of well know variables. */
1521 env_default(1, 1);
1522 while ((ep = env_default(0, 1)))
1523 env_opt_add(ep);
1524 return;
1526 vp = env_getvalue(ep);
1527 if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
1528 2 * strlen((char *)ep) + 6 > opt_replyend)
1531 int len;
1532 opt_replyend += OPT_REPLY_SIZE;
1533 len = opt_replyend - opt_reply;
1534 opt_reply = (unsigned char *)realloc(opt_reply, len);
1535 if (opt_reply == NULL) {
1536 /*@*/ printf("env_opt_add: realloc() failed!!!\n");
1537 opt_reply = opt_replyp = opt_replyend = NULL;
1538 return;
1540 opt_replyp = opt_reply + len - (opt_replyend - opt_replyp);
1541 opt_replyend = opt_reply + len;
1543 if (opt_welldefined(ep))
1544 #ifdef OLD_ENVIRON
1545 if (telopt_environ == TELOPT_OLD_ENVIRON)
1546 *opt_replyp++ = old_env_var;
1547 else
1548 #endif
1549 *opt_replyp++ = NEW_ENV_VAR;
1550 else
1551 *opt_replyp++ = ENV_USERVAR;
1552 for (;;) {
1553 while ((c = *ep++)) {
1554 if (opt_replyp + (2 + 2) > opt_replyend)
1555 return;
1556 switch(c&0xff) {
1557 case IAC:
1558 *opt_replyp++ = IAC;
1559 break;
1560 case NEW_ENV_VAR:
1561 case NEW_ENV_VALUE:
1562 case ENV_ESC:
1563 case ENV_USERVAR:
1564 *opt_replyp++ = ENV_ESC;
1565 break;
1567 *opt_replyp++ = c;
1569 if ((ep = vp)) {
1570 if (opt_replyp + (1 + 2 + 2) > opt_replyend)
1571 return;
1572 #ifdef OLD_ENVIRON
1573 if (telopt_environ == TELOPT_OLD_ENVIRON)
1574 *opt_replyp++ = old_env_value;
1575 else
1576 #endif
1577 *opt_replyp++ = NEW_ENV_VALUE;
1578 vp = NULL;
1579 } else
1580 break;
1585 opt_welldefined(const char *ep)
1587 if ((strcmp(ep, "USER") == 0) ||
1588 (strcmp(ep, "DISPLAY") == 0) ||
1589 (strcmp(ep, "PRINTER") == 0) ||
1590 (strcmp(ep, "SYSTEMTYPE") == 0) ||
1591 (strcmp(ep, "JOB") == 0) ||
1592 (strcmp(ep, "ACCT") == 0))
1593 return(1);
1594 return(0);
1597 void
1598 env_opt_end(int emptyok)
1600 int len;
1602 if (opt_replyp + 2 > opt_replyend)
1603 return;
1604 len = opt_replyp + 2 - opt_reply;
1605 if (emptyok || len > 6) {
1606 *opt_replyp++ = IAC;
1607 *opt_replyp++ = SE;
1608 if (NETROOM() > len) {
1609 ring_supply_data(&netoring, opt_reply, len);
1610 printsub('>', &opt_reply[2], len - 2);
1612 /*@*/ else printf("slc_end_reply: not enough room\n");
1614 if (opt_reply) {
1615 free(opt_reply);
1616 opt_reply = opt_replyp = opt_replyend = NULL;
1623 telrcv(void)
1625 int c;
1626 int scc;
1627 unsigned char *sbp;
1628 int count;
1629 int returnValue = 0;
1631 scc = 0;
1632 count = 0;
1633 while (TTYROOM() > 2) {
1634 if (scc == 0) {
1635 if (count) {
1636 ring_consumed(&netiring, count);
1637 returnValue = 1;
1638 count = 0;
1640 sbp = netiring.consume;
1641 scc = ring_full_consecutive(&netiring);
1642 if (scc == 0) {
1643 /* No more data coming in */
1644 break;
1648 c = *sbp++ & 0xff, scc--; count++;
1649 #ifdef ENCRYPTION
1650 if (decrypt_input)
1651 c = (*decrypt_input)(c);
1652 #endif /* ENCRYPTION */
1654 switch (telrcv_state) {
1656 case TS_CR:
1657 telrcv_state = TS_DATA;
1658 if (c == '\0') {
1659 break; /* Ignore \0 after CR */
1661 else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) {
1662 TTYADD(c);
1663 break;
1665 /* Else, fall through */
1667 case TS_DATA:
1668 if (c == IAC) {
1669 telrcv_state = TS_IAC;
1670 break;
1673 * The 'crmod' hack (see following) is needed
1674 * since we can't * set CRMOD on output only.
1675 * Machines like MULTICS like to send \r without
1676 * \n; since we must turn off CRMOD to get proper
1677 * input, the mapping is done here (sigh).
1679 if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) {
1680 if (scc > 0) {
1681 c = *sbp&0xff;
1682 #ifdef ENCRYPTION
1683 if (decrypt_input)
1684 c = (*decrypt_input)(c);
1685 #endif /* ENCRYPTION */
1686 if (c == 0) {
1687 sbp++, scc--; count++;
1688 /* a "true" CR */
1689 TTYADD('\r');
1690 } else if (my_want_state_is_dont(TELOPT_ECHO) &&
1691 (c == '\n')) {
1692 sbp++, scc--; count++;
1693 TTYADD('\n');
1694 } else {
1695 #ifdef ENCRYPTION
1696 if (decrypt_input)
1697 (*decrypt_input)(-1);
1698 #endif /* ENCRYPTION */
1700 TTYADD('\r');
1701 if (crmod) {
1702 TTYADD('\n');
1705 } else {
1706 telrcv_state = TS_CR;
1707 TTYADD('\r');
1708 if (crmod) {
1709 TTYADD('\n');
1712 } else {
1713 TTYADD(c);
1715 continue;
1717 case TS_IAC:
1718 process_iac:
1719 switch (c) {
1721 case WILL:
1722 telrcv_state = TS_WILL;
1723 continue;
1725 case WONT:
1726 telrcv_state = TS_WONT;
1727 continue;
1729 case DO:
1730 telrcv_state = TS_DO;
1731 continue;
1733 case DONT:
1734 telrcv_state = TS_DONT;
1735 continue;
1737 case DM:
1739 * We may have missed an urgent notification,
1740 * so make sure we flush whatever is in the
1741 * buffer currently.
1743 printoption("RCVD", IAC, DM);
1744 SYNCHing = 1;
1745 (void) ttyflush(1);
1746 SYNCHing = stilloob();
1747 settimer(gotDM);
1748 break;
1750 case SB:
1751 SB_CLEAR();
1752 telrcv_state = TS_SB;
1753 continue;
1755 case IAC:
1756 TTYADD(IAC);
1757 break;
1759 case NOP:
1760 case GA:
1761 default:
1762 printoption("RCVD", IAC, c);
1763 break;
1765 telrcv_state = TS_DATA;
1766 continue;
1768 case TS_WILL:
1769 printoption("RCVD", WILL, c);
1770 willoption(c);
1771 telrcv_state = TS_DATA;
1772 continue;
1774 case TS_WONT:
1775 printoption("RCVD", WONT, c);
1776 wontoption(c);
1777 telrcv_state = TS_DATA;
1778 continue;
1780 case TS_DO:
1781 printoption("RCVD", DO, c);
1782 dooption(c);
1783 if (c == TELOPT_NAWS) {
1784 sendnaws();
1785 } else if (c == TELOPT_LFLOW) {
1786 localflow = 1;
1787 setcommandmode();
1788 setconnmode(0);
1790 telrcv_state = TS_DATA;
1791 continue;
1793 case TS_DONT:
1794 printoption("RCVD", DONT, c);
1795 dontoption(c);
1796 flushline = 1;
1797 setconnmode(0); /* set new tty mode (maybe) */
1798 telrcv_state = TS_DATA;
1799 continue;
1801 case TS_SB:
1802 if (c == IAC) {
1803 telrcv_state = TS_SE;
1804 } else {
1805 SB_ACCUM(c);
1807 continue;
1809 case TS_SE:
1810 if (c != SE) {
1811 if (c != IAC) {
1813 * This is an error. We only expect to get
1814 * "IAC IAC" or "IAC SE". Several things may
1815 * have happend. An IAC was not doubled, the
1816 * IAC SE was left off, or another option got
1817 * inserted into the suboption are all possibilities.
1818 * If we assume that the IAC was not doubled,
1819 * and really the IAC SE was left off, we could
1820 * get into an infinate loop here. So, instead,
1821 * we terminate the suboption, and process the
1822 * partial suboption if we can.
1824 SB_ACCUM(IAC);
1825 SB_ACCUM(c);
1826 subpointer -= 2;
1827 SB_TERM();
1829 printoption("In SUBOPTION processing, RCVD", IAC, c);
1830 suboption(); /* handle sub-option */
1831 telrcv_state = TS_IAC;
1832 goto process_iac;
1834 SB_ACCUM(c);
1835 telrcv_state = TS_SB;
1836 } else {
1837 SB_ACCUM(IAC);
1838 SB_ACCUM(SE);
1839 subpointer -= 2;
1840 SB_TERM();
1841 suboption(); /* handle sub-option */
1842 telrcv_state = TS_DATA;
1846 if (count)
1847 ring_consumed(&netiring, count);
1848 return returnValue||count;
1851 static int bol = 1, local = 0;
1854 rlogin_susp(void)
1856 if (local) {
1857 local = 0;
1858 bol = 1;
1859 command(0, "z\n", 2);
1860 return(1);
1862 return(0);
1865 static int
1866 telsnd(void)
1868 int tcc;
1869 int count;
1870 int returnValue = 0;
1871 unsigned char *tbp;
1873 tcc = 0;
1874 count = 0;
1875 while (NETROOM() > 2) {
1876 int sc;
1877 int c;
1879 if (tcc == 0) {
1880 if (count) {
1881 ring_consumed(&ttyiring, count);
1882 returnValue = 1;
1883 count = 0;
1885 tbp = ttyiring.consume;
1886 tcc = ring_full_consecutive(&ttyiring);
1887 if (tcc == 0) {
1888 break;
1891 c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
1892 if (rlogin != _POSIX_VDISABLE) {
1893 if (bol) {
1894 bol = 0;
1895 if (sc == rlogin) {
1896 local = 1;
1897 continue;
1899 } else if (local) {
1900 local = 0;
1901 if (sc == '.' || c == termEofChar) {
1902 bol = 1;
1903 command(0, "close\n", 6);
1904 continue;
1906 if (sc == termSuspChar) {
1907 bol = 1;
1908 command(0, "z\n", 2);
1909 continue;
1911 if (sc == escape) {
1912 command(0, tbp, tcc);
1913 bol = 1;
1914 count += tcc;
1915 tcc = 0;
1916 flushline = 1;
1917 break;
1919 if (sc != rlogin) {
1920 ++tcc;
1921 --tbp;
1922 --count;
1923 c = sc = rlogin;
1926 if ((sc == '\n') || (sc == '\r'))
1927 bol = 1;
1928 } else if (escape != _POSIX_VDISABLE && sc == escape) {
1930 * Double escape is a pass through of a single escape character.
1932 if (tcc && strip(*tbp) == escape) {
1933 tbp++;
1934 tcc--;
1935 count++;
1936 bol = 0;
1937 } else {
1938 command(0, (char *)tbp, tcc);
1939 bol = 1;
1940 count += tcc;
1941 tcc = 0;
1942 flushline = 1;
1943 break;
1945 } else
1946 bol = 0;
1947 #ifdef KLUDGELINEMODE
1948 if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
1949 if (tcc > 0 && strip(*tbp) == echoc) {
1950 tcc--; tbp++; count++;
1951 } else {
1952 dontlecho = !dontlecho;
1953 settimer(echotoggle);
1954 setconnmode(0);
1955 flushline = 1;
1956 break;
1959 #endif
1960 if (MODE_LOCAL_CHARS(globalmode)) {
1961 if (TerminalSpecialChars(sc) == 0) {
1962 bol = 1;
1963 break;
1966 if (my_want_state_is_wont(TELOPT_BINARY)) {
1967 switch (c) {
1968 case '\n':
1970 * If we are in CRMOD mode (\r ==> \n)
1971 * on our local machine, then probably
1972 * a newline (unix) is CRLF (TELNET).
1974 if (MODE_LOCAL_CHARS(globalmode)) {
1975 NETADD('\r');
1977 NETADD('\n');
1978 bol = flushline = 1;
1979 break;
1980 case '\r':
1981 if (!crlf) {
1982 NET2ADD('\r', '\0');
1983 } else {
1984 NET2ADD('\r', '\n');
1986 bol = flushline = 1;
1987 break;
1988 case IAC:
1989 NET2ADD(IAC, IAC);
1990 break;
1991 default:
1992 NETADD(c);
1993 break;
1995 } else if (c == IAC) {
1996 NET2ADD(IAC, IAC);
1997 } else {
1998 NETADD(c);
2001 if (count)
2002 ring_consumed(&ttyiring, count);
2003 return returnValue||count; /* Non-zero if we did anything */
2007 * Scheduler()
2009 * Try to do something.
2011 * If we do something useful, return 1; else return 0.
2015 static int
2016 Scheduler(int block)
2018 /* One wants to be a bit careful about setting returnValue
2019 * to one, since a one implies we did some useful work,
2020 * and therefore probably won't be called to block next
2022 int returnValue;
2023 int netin, netout, netex, ttyin, ttyout;
2025 /* Decide which rings should be processed */
2027 netout = ring_full_count(&netoring) &&
2028 (flushline ||
2029 (my_want_state_is_wont(TELOPT_LINEMODE)
2030 #ifdef KLUDGELINEMODE
2031 && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
2032 #endif
2033 ) ||
2034 my_want_state_is_will(TELOPT_BINARY));
2035 ttyout = ring_full_count(&ttyoring);
2037 ttyin = ring_empty_count(&ttyiring) && (clienteof == 0);
2039 netin = !ISend && ring_empty_count(&netiring);
2041 netex = !SYNCHing;
2043 /* Call to system code to process rings */
2045 returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
2047 /* Now, look at the input rings, looking for work to do. */
2049 if (ring_full_count(&ttyiring)) {
2050 returnValue |= telsnd();
2053 if (ring_full_count(&netiring)) {
2054 returnValue |= telrcv();
2056 return returnValue;
2059 #ifdef AUTHENTICATION
2060 #define __unusedhere
2061 #else
2062 #define __unusedhere __unused
2063 #endif
2065 * Select from tty and network...
2067 void
2068 telnet(char *user __unusedhere)
2070 sys_telnet_init();
2072 #ifdef AUTHENTICATION
2073 #ifdef ENCRYPTION
2075 static char local_host[256] = { 0 };
2077 if (!local_host[0]) {
2078 gethostname(local_host, sizeof(local_host));
2079 local_host[sizeof(local_host)-1] = 0;
2081 auth_encrypt_init(local_host, hostname, "TELNET", 0);
2082 auth_encrypt_user(user);
2084 #endif
2085 #endif
2086 if (telnetport) {
2087 #ifdef AUTHENTICATION
2088 if (autologin)
2089 send_will(TELOPT_AUTHENTICATION, 1);
2090 #endif
2091 #ifdef ENCRYPTION
2092 send_do(TELOPT_ENCRYPT, 1);
2093 send_will(TELOPT_ENCRYPT, 1);
2094 #endif /* ENCRYPTION */
2095 send_do(TELOPT_SGA, 1);
2096 send_will(TELOPT_TTYPE, 1);
2097 send_will(TELOPT_NAWS, 1);
2098 send_will(TELOPT_TSPEED, 1);
2099 send_will(TELOPT_LFLOW, 1);
2100 send_will(TELOPT_LINEMODE, 1);
2101 send_will(TELOPT_NEW_ENVIRON, 1);
2102 send_do(TELOPT_STATUS, 1);
2103 if (env_getvalue("DISPLAY"))
2104 send_will(TELOPT_XDISPLOC, 1);
2105 if (eight)
2106 tel_enter_binary(eight);
2109 for (;;) {
2110 int schedValue;
2112 while ((schedValue = Scheduler(0)) != 0) {
2113 if (schedValue == -1) {
2114 setcommandmode();
2115 return;
2119 if (Scheduler(1) == -1) {
2120 setcommandmode();
2121 return;
2126 #if 0 /* XXX - this not being in is a bug */
2128 * nextitem()
2130 * Return the address of the next "item" in the TELNET data
2131 * stream. This will be the address of the next character if
2132 * the current address is a user data character, or it will
2133 * be the address of the character following the TELNET command
2134 * if the current address is a TELNET IAC ("I Am a Command")
2135 * character.
2138 static char *
2139 nextitem(char *current)
2141 if ((*current&0xff) != IAC) {
2142 return current+1;
2144 switch (*(current+1)&0xff) {
2145 case DO:
2146 case DONT:
2147 case WILL:
2148 case WONT:
2149 return current+3;
2150 case SB: /* loop forever looking for the SE */
2152 char *look = current+2;
2154 for (;;) {
2155 if ((*look++&0xff) == IAC) {
2156 if ((*look++&0xff) == SE) {
2157 return look;
2162 default:
2163 return current+2;
2166 #endif /* 0 */
2169 * netclear()
2171 * We are about to do a TELNET SYNCH operation. Clear
2172 * the path to the network.
2174 * Things are a bit tricky since we may have sent the first
2175 * byte or so of a previous TELNET command into the network.
2176 * So, we have to scan the network buffer from the beginning
2177 * until we are up to where we want to be.
2179 * A side effect of what we do, just to keep things
2180 * simple, is to clear the urgent data pointer. The principal
2181 * caller should be setting the urgent data pointer AFTER calling
2182 * us in any case.
2185 static void
2186 netclear(void)
2188 /* Deleted */
2192 * These routines add various telnet commands to the data stream.
2195 static void
2196 doflush(void)
2198 NET2ADD(IAC, DO);
2199 NETADD(TELOPT_TM);
2200 flushline = 1;
2201 flushout = 1;
2202 (void) ttyflush(1); /* Flush/drop output */
2203 /* do printoption AFTER flush, otherwise the output gets tossed... */
2204 printoption("SENT", DO, TELOPT_TM);
2207 void
2208 xmitAO(void)
2210 NET2ADD(IAC, AO);
2211 printoption("SENT", IAC, AO);
2212 if (autoflush) {
2213 doflush();
2217 void
2218 xmitEL(void)
2220 NET2ADD(IAC, EL);
2221 printoption("SENT", IAC, EL);
2224 void
2225 xmitEC(void)
2227 NET2ADD(IAC, EC);
2228 printoption("SENT", IAC, EC);
2232 dosynch(char *ch __unused)
2234 netclear(); /* clear the path to the network */
2235 NETADD(IAC);
2236 setneturg();
2237 NETADD(DM);
2238 printoption("SENT", IAC, DM);
2239 return 1;
2242 int want_status_response = 0;
2245 get_status(char *ch __unused)
2247 unsigned char tmp[16];
2248 unsigned char *cp;
2250 if (my_want_state_is_dont(TELOPT_STATUS)) {
2251 printf("Remote side does not support STATUS option\n");
2252 return 0;
2254 cp = tmp;
2256 *cp++ = IAC;
2257 *cp++ = SB;
2258 *cp++ = TELOPT_STATUS;
2259 *cp++ = TELQUAL_SEND;
2260 *cp++ = IAC;
2261 *cp++ = SE;
2262 if (NETROOM() >= cp - tmp) {
2263 ring_supply_data(&netoring, tmp, cp-tmp);
2264 printsub('>', tmp+2, cp - tmp - 2);
2266 ++want_status_response;
2267 return 1;
2270 void
2271 intp(void)
2273 NET2ADD(IAC, IP);
2274 printoption("SENT", IAC, IP);
2275 flushline = 1;
2276 if (autoflush) {
2277 doflush();
2279 if (autosynch) {
2280 dosynch(NULL);
2284 void
2285 sendbrk(void)
2287 NET2ADD(IAC, BREAK);
2288 printoption("SENT", IAC, BREAK);
2289 flushline = 1;
2290 if (autoflush) {
2291 doflush();
2293 if (autosynch) {
2294 dosynch(NULL);
2298 void
2299 sendabort(void)
2301 NET2ADD(IAC, ABORT);
2302 printoption("SENT", IAC, ABORT);
2303 flushline = 1;
2304 if (autoflush) {
2305 doflush();
2307 if (autosynch) {
2308 dosynch(NULL);
2312 void
2313 sendsusp(void)
2315 NET2ADD(IAC, SUSP);
2316 printoption("SENT", IAC, SUSP);
2317 flushline = 1;
2318 if (autoflush) {
2319 doflush();
2321 if (autosynch) {
2322 dosynch(NULL);
2326 void
2327 sendeof(void)
2329 NET2ADD(IAC, xEOF);
2330 printoption("SENT", IAC, xEOF);
2333 void
2334 sendayt(void)
2336 NET2ADD(IAC, AYT);
2337 printoption("SENT", IAC, AYT);
2341 * Send a window size update to the remote system.
2344 void
2345 sendnaws(void)
2347 long rows, cols;
2348 unsigned char tmp[16];
2349 unsigned char *cp;
2351 if (my_state_is_wont(TELOPT_NAWS))
2352 return;
2354 #define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \
2355 if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; }
2357 if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */
2358 return;
2361 cp = tmp;
2363 *cp++ = IAC;
2364 *cp++ = SB;
2365 *cp++ = TELOPT_NAWS;
2366 PUTSHORT(cp, cols);
2367 PUTSHORT(cp, rows);
2368 *cp++ = IAC;
2369 *cp++ = SE;
2370 if (NETROOM() >= cp - tmp) {
2371 ring_supply_data(&netoring, tmp, cp-tmp);
2372 printsub('>', tmp+2, cp - tmp - 2);
2376 void
2377 tel_enter_binary(int rw)
2379 if (rw&1)
2380 send_do(TELOPT_BINARY, 1);
2381 if (rw&2)
2382 send_will(TELOPT_BINARY, 1);
2385 void
2386 tel_leave_binary(int rw)
2388 if (rw&1)
2389 send_dont(TELOPT_BINARY, 1);
2390 if (rw&2)
2391 send_wont(TELOPT_BINARY, 1);