1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /* based on @(#)utility.c 8.1 (Berkeley) 6/4/93 */
35
36 #include <autoconf.h>
37
38 #include <stdarg.h>
39 #define PRINTOPTIONS
40 #include "telnetd.h"
41
42 #ifdef HAVE_SYS_UTSNAME_H
43 #include <sys/utsname.h>
44 #endif
45
46 #if defined(AUTHENTICATION)
47 #include <libtelnet/auth.h>
48 #endif
49 #ifdef ENCRYPTION
50 #include <libtelnet/encrypt.h>
51 #endif
52
53 /*
54 * utility functions performing io related tasks
55 */
56
57 /*
58 * ttloop
59 *
60 * A small subroutine to flush the network output buffer, get some data
61 * from the network, and pass it through the telnet state machine. We
62 * also flush the pty input buffer (by dropping its data) if it becomes
63 * too full.
64 */
65
66 void
ttloop()67 ttloop()
68 {
69 void netflush();
70
71 DIAG(TD_REPORT, netputs("td: ttloop\r\n"));
72 if (nfrontp-nbackp) {
73 netflush();
74 }
75 read_again:
76 ncc = read(net, netibuf, sizeof netibuf);
77 if (ncc < 0) {
78 if (errno == EINTR)
79 goto read_again;
80 syslog(LOG_INFO, "ttloop: read: %m");
81 exit(1);
82 } else if (ncc == 0) {
83 syslog(LOG_INFO, "ttloop: peer died: %m");
84 exit(1);
85 }
86 DIAG(TD_REPORT, netprintf("td: ttloop read %d chars\r\n", ncc));
87 netip = netibuf;
88 telrcv(); /* state machine */
89 if (ncc > 0) {
90 pfrontp = pbackp = ptyobuf;
91 telrcv();
92 }
93 } /* end of ttloop */
94
95 /*
96 * ttsuck - This is a horrible kludge to deal with a bug in
97 * HostExplorer. HostExplorer thinks it knows how to do krb5 auth, but
98 * it doesn't really. So if you offer it krb5 as an auth choice before
99 * krb4, it will sabotage the connection. So we peek ahead into the
100 * input stream to see if the client is a UNIX client, and then
101 * (later) offer krb5 first only if it is. Since no Mac/PC telnet
102 * clients do auto switching between krb4 and krb5 like the UNIX
103 * client does, it doesn't matter what order they see the choices in
104 * (except for HostExplorer).
105 *
106 * It is actually not possible to do this without looking ahead into
107 * the input stream: the client and server both try to begin
108 * auth/encryption negotiation as soon as possible, so if we let the
109 * server process things normally, it will already have sent the list
110 * of supported auth types before seeing the NEW-ENVIRON option. If
111 * you change the code to hold off sending the list of supported auth
112 * types until after it knows whether or not the remote side supports
113 * NEW-ENVIRON, then the auth negotiation and encryption negotiation
114 * race conditions won't interact properly, and encryption negotiation
115 * will reliably fail.
116 */
117
118 void
ttsuck()119 ttsuck()
120 {
121 extern int auth_client_non_unix;
122 int nread;
123 struct timeval tv;
124 fd_set fds;
125 char *p, match[] = {IAC, WILL, TELOPT_NEW_ENVIRON};
126
127 if (nfrontp-nbackp) {
128 netflush();
129 }
130 tv.tv_sec = 1;
131 tv.tv_usec = 0;
132 FD_SET(net, &fds);
133
134 while (select(net + 1, &fds, NULL, NULL, &tv) == 1)
135 {
136 nread = read(net, netibuf + ncc, sizeof(netibuf) - ncc);
137 if (nread <= 0)
138 break;
139 ncc += nread;
140 }
141
142 auth_client_non_unix = 1;
143 for (p = netibuf; p < netibuf + ncc; p++)
144 {
145 if (!memcmp(p, match, sizeof(match)))
146 {
147 auth_client_non_unix = 0;
148 break;
149 }
150 }
151
152 if (ncc > 0)
153 telrcv();
154 }
155
156 /*
157 * Check a descriptor to see if out of band data exists on it.
158 */
159 int
stilloob(s)160 stilloob(s)
161 int s; /* socket number */
162 {
163 static struct timeval timeout = { 0 };
164 fd_set excepts;
165 int value;
166
167 do {
168 FD_ZERO(&excepts);
169 FD_SET(s, &excepts);
170 value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
171 } while ((value == -1) && (errno == EINTR));
172
173 if (value < 0) {
174 fatalperror(pty, "select");
175 }
176 if (FD_ISSET(s, &excepts)) {
177 return 1;
178 } else {
179 return 0;
180 }
181 }
182
183 void
ptyflush()184 ptyflush()
185 {
186 int n;
187
188 if ((n = pfrontp - pbackp) > 0) {
189 DIAG((TD_REPORT | TD_PTYDATA),
190 netprintf("td: ptyflush %d chars\r\n", n));
191 DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
192 n = write(pty, pbackp, (unsigned) n);
193 }
194 if (n < 0) {
195 if (errno == EWOULDBLOCK || errno == EINTR)
196 return;
197 (void)signal(SIGCHLD, SIG_DFL);
198 cleanup(0);
199 }
200 pbackp += n;
201 if (pbackp == pfrontp)
202 pbackp = pfrontp = ptyobuf;
203 }
204
205 /*
206 * nextitem()
207 *
208 * Return the address of the next "item" in the TELNET data
209 * stream. This will be the address of the next character if
210 * the current address is a user data character, or it will
211 * be the address of the character following the TELNET command
212 * if the current address is a TELNET IAC ("I Am a Command")
213 * character.
214 */
215 static char *
nextitem(current)216 nextitem(current)
217 char *current;
218 {
219 if ((*current&0xff) != IAC) {
220 return current+1;
221 }
222 switch (*(current+1)&0xff) {
223 case DO:
224 case DONT:
225 case WILL:
226 case WONT:
227 return current+3;
228 case SB: /* loop forever looking for the SE */
229 {
230 register char *look = current+2;
231
232 for (;;) {
233 if ((*look++&0xff) == IAC) {
234 if ((*look++&0xff) == SE) {
235 return look;
236 }
237 }
238 }
239 }
240 default:
241 return current+2;
242 }
243 } /* end of nextitem */
244
245
246 /*
247 * netclear()
248 *
249 * We are about to do a TELNET SYNCH operation. Clear
250 * the path to the network.
251 *
252 * Things are a bit tricky since we may have sent the first
253 * byte or so of a previous TELNET command into the network.
254 * So, we have to scan the network buffer from the beginning
255 * until we are up to where we want to be.
256 *
257 * A side effect of what we do, just to keep things
258 * simple, is to clear the urgent data pointer. The principal
259 * caller should be setting the urgent data pointer AFTER calling
260 * us in any case.
261 */
262 void
netclear()263 netclear()
264 {
265 register char *thisitem, *next;
266 char *good;
267 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
268 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
269
270 #ifdef ENCRYPTION
271 thisitem = nclearto > netobuf ? nclearto : netobuf;
272 #else /* ENCRYPTION */
273 thisitem = netobuf;
274 #endif /* ENCRYPTION */
275
276 while ((next = nextitem(thisitem)) <= nbackp) {
277 thisitem = next;
278 }
279
280 /* Now, thisitem is first before/at boundary. */
281
282 #ifdef ENCRYPTION
283 good = nclearto > netobuf ? nclearto : netobuf;
284 #else /* ENCRYPTION */
285 good = netobuf; /* where the good bytes go */
286 #endif /* ENCRYPTION */
287
288 while (nfrontp > thisitem) {
289 if (wewant(thisitem)) {
290 unsigned int length;
291
292 next = thisitem;
293 do {
294 next = nextitem(next);
295 } while (wewant(next) && (nfrontp > next));
296 length = next-thisitem;
297 memcpy(good, thisitem, length);
298 good += length;
299 thisitem = next;
300 } else {
301 thisitem = nextitem(thisitem);
302 }
303 }
304
305 nbackp = netobuf;
306 nfrontp = good; /* next byte to be sent */
307 neturg = 0;
308 } /* end of netclear */
309
310 /*
311 * netflush
312 * Send as much data as possible to the network,
313 * handling requests for urgent data.
314 */
315 void
netflush()316 netflush()
317 {
318 int n;
319 extern int not42;
320
321 if ((n = nfrontp - nbackp) > 0) {
322 DIAG(TD_REPORT, {netprintf_noflush("td: netflush %d chars\r\n", n);
323 n = nfrontp - nbackp;});
324 #ifdef ENCRYPTION
325 if (encrypt_output) {
326 char *s = nclearto ? nclearto : nbackp;
327 if (nfrontp - s > 0) {
328 (*encrypt_output)((unsigned char *)s, nfrontp-s);
329 nclearto = nfrontp;
330 }
331 }
332 #endif /* ENCRYPTION */
333 /*
334 * if no urgent data, or if the other side appears to be an
335 * old 4.2 client (and thus unable to survive TCP urgent data),
336 * write the entire buffer in non-OOB mode.
337 */
338 if ((neturg == 0) || (not42 == 0)) {
339 n = write(net, nbackp, (unsigned) n); /* normal write */
340 } else {
341 n = neturg - nbackp;
342 /*
343 * In 4.2 (and 4.3) systems, there is some question about
344 * what byte in a sendOOB operation is the "OOB" data.
345 * To make ourselves compatible, we only send ONE byte
346 * out of band, the one WE THINK should be OOB (though
347 * we really have more the TCP philosophy of urgent data
348 * rather than the Unix philosophy of OOB data).
349 */
350 if (n > 1) {
351 n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */
352 } else {
353 n = send(net, nbackp, n, MSG_OOB); /* URGENT data */
354 }
355 }
356 }
357 if (n < 0) {
358 if (errno == EWOULDBLOCK || errno == EINTR)
359 return;
360 (void)signal(SIGCHLD, SIG_DFL);
361 cleanup(0);
362 }
363 nbackp += n;
364 #ifdef ENCRYPTION
365 if (nbackp > nclearto)
366 nclearto = 0;
367 #endif /* ENCRYPTION */
368 if (nbackp >= neturg) {
369 neturg = 0;
370 }
371 if (nbackp == nfrontp) {
372 nbackp = nfrontp = netobuf;
373 #ifdef ENCRYPTION
374 nclearto = 0;
375 #endif /* ENCRYPTION */
376 }
377 return;
378 } /* end of netflush */
379
380 /*
381 * L8_256(x) = log8(256**x), rounded up, including sign (for decimal
382 * strings too). log8(256) = 8/3, but we use integer math to round
383 * up.
384 */
385 #define L8_256(x) (((x * 8 + 2) / 3) + 1)
386
387 /*
388 * netprintf
389 *
390 * Do the equivalent of printf() to the NETOBUF "ring buffer",
391 * possibly calling netflush() if needed.
392 *
393 * Thou shalt not call this with a "%s" format; use netputs instead.
394 * We also don't deal with floating point widths in here.
395 */
396 static void
397 netprintf_ext(int noflush, int seturg, const char *fmt, va_list args)
398 #if !defined(__cplusplus) && (__GNUC__ > 2)
399 __attribute__((__format__(__printf__, 3, 0)))
400 #endif
401 ;
402
403 static void
netprintf_ext(int noflush,int seturg,const char * fmt,va_list args)404 netprintf_ext(int noflush, int seturg, const char *fmt, va_list args)
405 {
406 size_t remain;
407 size_t maxoutlen;
408 char buf[BUFSIZ];
409 const char *cp;
410 int len;
411
412 buf[0] = '\0'; /* nul-terminate */
413 remain = sizeof(netobuf) - (nfrontp - netobuf);
414 for (maxoutlen = 0, cp = fmt; *cp; cp++) {
415 if (*cp == '%')
416 /* Ok so this is slightly overkill... */
417 maxoutlen += L8_256(sizeof(long));
418 else
419 maxoutlen++;
420 }
421 if (maxoutlen >= sizeof(buf))
422 return; /* highly unlikely */
423
424 len = vsnprintf(buf, sizeof(buf), fmt, args);
425
426 /*
427 * The return value from sprintf()-like functions may be the
428 * number of characters that *would* have been output, not the
429 * number actually output.
430 */
431 if (len <= 0 || (size_t) len > sizeof(buf))
432 return;
433 if (remain < (size_t) len && !noflush) {
434 netflush();
435 remain = sizeof(netobuf) - (nfrontp - netobuf);
436 }
437 if (remain < (size_t) len)
438 return; /* still not enough space? */
439 memcpy(nfrontp, buf, (size_t)len);
440 nfrontp += len;
441 if (seturg)
442 neturg = nfrontp - 1;
443 }
444
445 void
netprintf(const char * fmt,...)446 netprintf(const char *fmt, ...)
447 {
448 va_list args;
449
450 va_start(args, fmt);
451 netprintf_ext(0, 0, fmt, args);
452 va_end(args);
453 }
454
455 void
netprintf_urg(const char * fmt,...)456 netprintf_urg(const char *fmt, ...)
457 {
458 va_list args;
459
460 va_start(args, fmt);
461 netprintf_ext(0, 1, fmt, args);
462 va_end(args);
463 }
464
465 void
netprintf_noflush(const char * fmt,...)466 netprintf_noflush(const char *fmt, ...)
467 {
468 va_list args;
469
470 va_start(args, fmt);
471 netprintf_ext(1, 0, fmt, args);
472 va_end(args);
473 }
474
475 /*
476 * netwrite
477 *
478 * Copy BUF into the NETOBUF "ring buffer", possibly calling
479 * netflush() if needed.
480 */
481 int
netwrite(const unsigned char * buf,size_t len)482 netwrite(const unsigned char *buf, size_t len)
483 {
484 int remaining, copied;
485
486 remaining = BUFSIZ - (nfrontp - netobuf);
487 while (len > 0) {
488 /* Free up enough space if the room is too low*/
489 if ((len > BUFSIZ ? BUFSIZ : len) > remaining) {
490 netflush();
491 remaining = BUFSIZ - (nfrontp - netobuf);
492 }
493
494 /* Copy out as much as will fit */
495 copied = remaining > len ? len : remaining;
496 memmove(nfrontp, buf, copied);
497 nfrontp += copied;
498 len -= copied;
499 remaining -= copied;
500 buf += copied;
501 }
502 return copied;
503 }
504
505 /*
506 * netputs
507 *
508 * Write S to the NETOBUF "ring buffer". Does not write a '\n'.
509 */
510 void
netputs(const char * s)511 netputs(const char *s)
512 {
513 netwrite((const unsigned char *) s, strlen(s));
514 }
515
516 /*
517 * miscellaneous functions doing a variety of little jobs follow ...
518 */
519
520
521 void
fatal(f,msg)522 fatal(f, msg)
523 int f;
524 const char *msg;
525 {
526 char buf[BUFSIZ];
527
528 (void) snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
529 #ifdef ENCRYPTION
530 if (encrypt_output) {
531 /*
532 * Better turn off encryption first....
533 * Hope it flushes...
534 */
535 encrypt_send_end();
536 netflush();
537 }
538 #endif /* ENCRYPTION */
539 (void) write(f, buf, strlen(buf));
540 sleep(1); /*XXX*/
541 exit(1);
542 }
543
544 void
fatalperror(f,msg)545 fatalperror(f, msg)
546 int f;
547 const char *msg;
548 {
549 char buf[BUFSIZ], *strerror();
550
551 (void) snprintf(buf, sizeof(buf), "%s: %s\r\n", msg, strerror(errno));
552 fatal(f, buf);
553 }
554
555 char editedhost[32];
556
557 void
edithost(pat,host)558 edithost(pat, host)
559 register char *pat;
560 register char *host;
561 {
562 register char *res = editedhost;
563
564 if (!pat)
565 pat = "";
566 while (*pat) {
567 switch (*pat) {
568
569 case '#':
570 if (*host)
571 host++;
572 break;
573
574 case '@':
575 if (*host)
576 *res++ = *host++;
577 break;
578
579 default:
580 *res++ = *pat;
581 break;
582 }
583 if (res == &editedhost[sizeof editedhost - 1]) {
584 *res = '\0';
585 return;
586 }
587 pat++;
588 }
589 if (*host)
590 (void) strncpy(res, host,
591 sizeof editedhost - (res - editedhost) -1);
592 else
593 *res = '\0';
594 editedhost[sizeof editedhost - 1] = '\0';
595 }
596
597 static char *putlocation;
598
599 static void
putstr(s)600 putstr(s)
601 register char *s;
602 {
603
604 while (*s)
605 putchr(*s++);
606 }
607
608 void
putchr(cc)609 putchr(cc)
610 int cc;
611 {
612 *putlocation++ = cc;
613 }
614
615 /*
616 * This is split on two lines so that SCCS will not see the M
617 * between two % signs and expand it...
618 */
619 static char fmtstr[] = { "%l:%M\
620 %P on %A, %d %B %Y" };
621
622 void
putf(cp,where)623 putf(cp, where)
624 register char *cp;
625 char *where;
626 {
627 char *slash;
628 time_t t;
629 char db[100];
630 #ifdef HAVE_SYS_UTSNAME_H
631 struct utsname utsinfo;
632
633 (void) uname(&utsinfo);
634 #endif
635
636 putlocation = where;
637
638 while (*cp) {
639 if (*cp != '%') {
640 putchr(*cp++);
641 continue;
642 }
643 switch (*++cp) {
644
645 case 't':
646 #ifdef STREAMSPTY
647 /* names are like /dev/pts/2 -- we want pts/2 */
648 slash = strchr(line+1, '/');
649 #else
650 slash = strrchr(line, '/');
651 #endif
652 if (slash == (char *) 0)
653 putstr(line);
654 else
655 putstr(&slash[1]);
656 break;
657
658 case 'h':
659 putstr(editedhost);
660 break;
661
662 case 'd':
663 (void)time(&t);
664 (void)strftime(db, sizeof(db), fmtstr, localtime(&t));
665 putstr(db);
666 break;
667
668 #ifdef HAVE_SYS_UTSNAME_H
669 case 's':
670 putstr(utsinfo.sysname);
671 break;
672
673 case 'm':
674 putstr(utsinfo.machine);
675 break;
676
677 case 'r':
678 putstr(utsinfo.release);
679 break;
680
681 case 'v':
682 putstr(utsinfo.version);
683 break;
684 #endif
685
686 case '%':
687 putchr('%');
688 break;
689 }
690 cp++;
691 }
692 }
693
694 #ifdef DIAGNOSTICS
695 /*
696 * Print telnet options and commands in plain text, if possible.
697 */
698 void
printoption(fmt,option)699 printoption(fmt, option)
700 register char *fmt;
701 register int option;
702 {
703 netputs(fmt);
704 netputs(" ");
705 if (TELOPT_OK(option)) {
706 netputs(TELOPT(option));
707 netputs("\r\n");
708 } else if (TELCMD_OK(option)) {
709 netputs(TELCMD(option));
710 netputs("\r\n");
711 } else {
712 netprintf("%d\r\n", option);
713 }
714 return;
715 }
716
717 void
printsub(direction,pointer,length)718 printsub(direction, pointer, length)
719 char direction; /* '<' or '>' */
720 unsigned char *pointer; /* where suboption data sits */
721 int length; /* length of suboption data */
722 {
723 register int i = 0;
724 char buf[512];
725
726 if (!(diagnostic & TD_OPTIONS))
727 return;
728
729 if (direction) {
730 netputs("td: ");
731 netputs(direction == '<' ? "recv" : "send");
732 netputs(" suboption ");
733 if (length >= 3) {
734 register int j;
735
736 i = pointer[length-2];
737 j = pointer[length-1];
738
739 if (i != IAC || j != SE) {
740 netputs("(terminated by ");
741 if (TELOPT_OK(i))
742 netputs(TELOPT(i));
743 else if (TELCMD_OK(i))
744 netputs(TELCMD(i));
745 else
746 netprintf("%d", i);
747 netputs(" ");
748 if (TELOPT_OK(j))
749 netputs(TELOPT(j));
750 else if (TELCMD_OK(j))
751 netputs(TELCMD(j));
752 else
753 netprintf("%d", j);
754 netputs(", not IAC SE!) ");
755 }
756 }
757 length -= 2;
758 }
759 if (length < 1) {
760 netputs("(Empty suboption??\?)");
761 return;
762 }
763 switch (pointer[0]) {
764 case TELOPT_TTYPE:
765 netputs("TERMINAL-TYPE ");
766 switch (pointer[1]) {
767 case TELQUAL_IS:
768 netputs("IS \"");
769 netwrite(pointer + 2, (size_t)(length - 2));
770 netputs("\"");
771 break;
772 case TELQUAL_SEND:
773 netputs("SEND");
774 break;
775 default:
776 netprintf("- unknown qualifier %d (0x%x).",
777 pointer[1], pointer[1]);
778 }
779 break;
780 case TELOPT_TSPEED:
781 netputs("TERMINAL-SPEED ");
782 if (length < 2) {
783 netputs("(empty suboption??\?)");
784 break;
785 }
786 switch (pointer[1]) {
787 case TELQUAL_IS:
788 netputs("IS ");
789 netwrite(pointer + 2, (size_t)(length - 2));
790 break;
791 default:
792 if (pointer[1] == 1)
793 netputs("SEND");
794 else
795 netprintf("%d (unknown)", pointer[1]);
796 for (i = 2; i < length; i++)
797 netprintf(" ?%d?", pointer[i]);
798 break;
799 }
800 break;
801
802 case TELOPT_LFLOW:
803 netputs("TOGGLE-FLOW-CONTROL ");
804 if (length < 2) {
805 netputs("(empty suboption??\?)");
806 break;
807 }
808 switch (pointer[1]) {
809 case LFLOW_OFF:
810 netputs("OFF"); break;
811 case LFLOW_ON:
812 netputs("ON"); break;
813 case LFLOW_RESTART_ANY:
814 netputs("RESTART-ANY"); break;
815 case LFLOW_RESTART_XON:
816 netputs("RESTART-XON"); break;
817 default:
818 netprintf("%d (unknown)", pointer[1]);
819 }
820 for (i = 2; i < length; i++)
821 netprintf(" ?%d?", pointer[i]);
822 break;
823
824 case TELOPT_NAWS:
825 netputs("NAWS");
826 if (length < 2) {
827 netputs(" (empty suboption??\?)");
828 break;
829 }
830 if (length == 2) {
831 netprintf(" ?%d?", pointer[1]);
832 break;
833 }
834 netprintf(" %d %d (%d)",
835 pointer[1], pointer[2],
836 (int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
837 if (length == 4) {
838 netprintf(" ?%d?", pointer[3]);
839 break;
840 }
841 netprintf(" %d %d (%d)",
842 pointer[3], pointer[4],
843 (int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
844 for (i = 5; i < length; i++)
845 netprintf(" ?%d?", pointer[i]);
846 break;
847
848 case TELOPT_LINEMODE:
849 netputs("LINEMODE ");
850 if (length < 2) {
851 netputs("(empty suboption??\?)");
852 break;
853 }
854 switch (pointer[1]) {
855 case WILL:
856 netputs("WILL ");
857 goto common;
858 case WONT:
859 netputs("WONT ");
860 goto common;
861 case DO:
862 netputs("DO ");
863 goto common;
864 case DONT:
865 netputs("DONT ");
866 common:
867 if (length < 3) {
868 netputs("(no option??\?)");
869 break;
870 }
871 switch (pointer[2]) {
872 case LM_FORWARDMASK:
873 netputs("Forward Mask");
874 for (i = 3; i < length; i++)
875 netprintf(" %x", pointer[i]);
876 break;
877 default:
878 netprintf("%d (unknown)", pointer[2]);
879 for (i = 3; i < length; i++)
880 netprintf(" %d", pointer[i]);
881 break;
882 }
883 break;
884
885 case LM_SLC:
886 netputs("SLC");
887 for (i = 2; i < length - 2; i += 3) {
888 if (SLC_NAME_OK(pointer[i+SLC_FUNC])) {
889 netputs(" ");
890 netputs(SLC_NAME(pointer[i+SLC_FUNC]));
891 } else
892 netprintf(" %d", pointer[i+SLC_FUNC]);
893 switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
894 case SLC_NOSUPPORT:
895 netputs(" NOSUPPORT"); break;
896 case SLC_CANTCHANGE:
897 netputs(" CANTCHANGE"); break;
898 case SLC_VARIABLE:
899 netputs(" VARIABLE"); break;
900 case SLC_DEFAULT:
901 netputs(" DEFAULT"); break;
902 }
903 netputs(pointer[i+SLC_FLAGS]&SLC_ACK
904 ? "|ACK" : "");
905 netputs(pointer[i+SLC_FLAGS]&SLC_FLUSHIN
906 ? "|FLUSHIN" : "");
907 netputs(pointer[i+SLC_FLAGS]&SLC_FLUSHOUT
908 ? "|FLUSHOUT" : "");
909 if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
910 SLC_FLUSHOUT| SLC_LEVELBITS)) {
911 netprintf("(0x%x)", pointer[i+SLC_FLAGS]);
912 }
913 netprintf(" %d;", pointer[i+SLC_VALUE]);
914 if ((pointer[i+SLC_VALUE] == IAC) &&
915 (pointer[i+SLC_VALUE+1] == IAC))
916 i++;
917 }
918 for (; i < length; i++)
919 netprintf(" ?%d?", pointer[i]);
920 break;
921
922 case LM_MODE:
923 netputs("MODE ");
924 if (length < 3) {
925 netputs("(no mode??\?)");
926 break;
927 }
928 {
929 int wrotemode = 0;
930
931 #define NETPUTS_MODE(x) \
932 do { \
933 if (pointer[2] & (MODE_##x)) { \
934 if (wrotemode) netputs("|"); \
935 netputs(#x); \
936 wrotemode++; \
937 } \
938 } while (0)
939 NETPUTS_MODE(EDIT);
940 NETPUTS_MODE(TRAPSIG);
941 NETPUTS_MODE(SOFT_TAB);
942 NETPUTS_MODE(LIT_ECHO);
943 NETPUTS_MODE(ACK);
944 #undef NETPUTS_MODE
945 if (!wrotemode)
946 netputs("0");
947 }
948 if (pointer[2] & ~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK))
949 netprintf(" (0x%x)", pointer[2]);
950 for (i = 3; i < length; i++)
951 netprintf(" ?0x%x?", pointer[i]);
952 break;
953 default:
954 netprintf("%d (unknown)", pointer[1]);
955 for (i = 2; i < length; i++)
956 netprintf(" %d", pointer[i]);
957 }
958 break;
959
960 case TELOPT_STATUS: {
961 register char *cp;
962 register int j, k;
963
964 netputs("STATUS");
965
966 switch (pointer[1]) {
967 default:
968 if (pointer[1] == TELQUAL_SEND)
969 netputs(" SEND");
970 else
971 netprintf(" %d (unknown)", pointer[1]);
972 for (i = 2; i < length; i++)
973 netprintf(" ?%d?", pointer[i]);
974 break;
975 case TELQUAL_IS:
976 netputs(" IS\r\n");
977
978 for (i = 2; i < length; i++) {
979 switch(pointer[i]) {
980 case DO: cp = "DO"; goto common2;
981 case DONT: cp = "DONT"; goto common2;
982 case WILL: cp = "WILL"; goto common2;
983 case WONT: cp = "WONT"; goto common2;
984 common2:
985 i++;
986 netputs(" ");
987 netputs(cp);
988 netputs(" ");
989 if (TELOPT_OK(pointer[i]))
990 netputs(TELOPT(pointer[i]));
991 else
992 netprintf("%d", pointer[i]);
993
994 netputs("\r\n");
995 break;
996
997 case SB:
998 netputs(" SB ");
999 i++;
1000 j = k = i;
1001 while (j < length) {
1002 if (pointer[j] == SE) {
1003 if (j+1 == length)
1004 break;
1005 if (pointer[j+1] == SE)
1006 j++;
1007 else
1008 break;
1009 }
1010 pointer[k++] = pointer[j++];
1011 }
1012 printsub(0, &pointer[i], k - i);
1013 if (i < length) {
1014 netputs(" SE");
1015 i = j;
1016 } else
1017 i = j - 1;
1018
1019 netputs("\r\n");
1020
1021 break;
1022
1023 default:
1024 netprintf(" %d", pointer[i]);
1025 break;
1026 }
1027 }
1028 break;
1029 }
1030 break;
1031 }
1032
1033 case TELOPT_XDISPLOC:
1034 netputs("X-DISPLAY-LOCATION ");
1035 switch (pointer[1]) {
1036 case TELQUAL_IS:
1037 netputs("IS \"");
1038 netwrite(pointer + 2, (size_t)(length - 2));
1039 netputs("\"");
1040 break;
1041 case TELQUAL_SEND:
1042 netputs("SEND");
1043 break;
1044 default:
1045 netprintf("- unknown qualifier %d (0x%x).",
1046 pointer[1], pointer[1]);
1047 }
1048 break;
1049
1050 case TELOPT_NEW_ENVIRON:
1051 netputs("NEW-ENVIRON ");
1052 goto env_common1;
1053 case TELOPT_OLD_ENVIRON:
1054 netputs("OLD-ENVIRON ");
1055 env_common1:
1056 switch (pointer[1]) {
1057 case TELQUAL_IS:
1058 netputs("IS ");
1059 goto env_common;
1060 case TELQUAL_SEND:
1061 netputs("SEND ");
1062 goto env_common;
1063 case TELQUAL_INFO:
1064 netputs("INFO ");
1065 env_common:
1066 {
1067 register int noquote = 2;
1068 for (i = 2; i < length; i++ ) {
1069 switch (pointer[i]) {
1070 case NEW_ENV_VAR:
1071 netputs("\" VAR " + noquote);
1072 noquote = 2;
1073 break;
1074
1075 case NEW_ENV_VALUE:
1076 netputs("\" VALUE " + noquote);
1077 noquote = 2;
1078 break;
1079
1080 case ENV_ESC:
1081 netputs("\" ESC " + noquote);
1082 noquote = 2;
1083 break;
1084
1085 case ENV_USERVAR:
1086 netputs("\" USERVAR " + noquote);
1087 noquote = 2;
1088 break;
1089
1090 default:
1091 if (isprint(pointer[i]) && pointer[i] != '"') {
1092 if (noquote) {
1093 netputs("\"");
1094 noquote = 0;
1095 }
1096 netprintf("%c", pointer[i]);
1097 } else {
1098 netprintf("\" %03o " + noquote,
1099 pointer[i]);
1100 noquote = 2;
1101 }
1102 break;
1103 }
1104 }
1105 if (!noquote)
1106 netputs("\"");
1107 break;
1108 }
1109 }
1110 break;
1111
1112 #if defined(AUTHENTICATION)
1113 case TELOPT_AUTHENTICATION:
1114 netputs("AUTHENTICATION");
1115
1116 if (length < 2) {
1117 netputs(" (empty suboption??\?)");
1118 break;
1119 }
1120 switch (pointer[1]) {
1121 case TELQUAL_REPLY:
1122 case TELQUAL_IS:
1123 netputs((pointer[1] == TELQUAL_IS) ? " IS " : " REPLY ");
1124 if (AUTHTYPE_NAME_OK(pointer[2]))
1125 netputs(AUTHTYPE_NAME(pointer[2]));
1126 else
1127 netprintf(" %d ", pointer[2]);
1128 if (length < 3) {
1129 netputs("(partial suboption??\?)");
1130 break;
1131 }
1132 netputs(((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT)
1133 ? "CLIENT|" : "SERVER|");
1134 netputs(((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
1135 ? "MUTUAL" : "ONE-WAY");
1136 netputs(((pointer[3] & AUTH_ENCRYPT_MASK) == AUTH_ENCRYPT_ON)
1137 ? "|ENCRYPT" : "");
1138
1139 auth_printsub(&pointer[1], length - 1, (unsigned char *)buf,
1140 sizeof(buf));
1141 netputs(buf);
1142 break;
1143
1144 case TELQUAL_SEND:
1145 i = 2;
1146 netputs(" SEND ");
1147 while (i < length) {
1148 if (AUTHTYPE_NAME_OK(pointer[i]))
1149 netputs(AUTHTYPE_NAME(pointer[i]));
1150 else
1151 netprintf("%d", pointer[i]);
1152 netputs(" ");
1153 if (++i >= length) {
1154 netputs("(partial suboption??\?)");
1155 break;
1156 }
1157 netputs(((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT)
1158 ? "CLIENT|" : "SERVER|");
1159 netputs(((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
1160 ? "MUTUAL" : "ONE-WAY");
1161 if ((pointer[3] & AUTH_ENCRYPT_MASK) == AUTH_ENCRYPT_ON)
1162 netputs("|ENCRYPT");
1163 ++i;
1164 }
1165 break;
1166
1167 case TELQUAL_NAME:
1168 i = 2;
1169 netputs(" NAME \"");
1170 while (i < length) {
1171 if (isprint(pointer[i]))
1172 netprintf("%c", pointer[i++]);
1173 else {
1174 netprintf("\\%03o", pointer[i++]);
1175 }
1176 }
1177 netputs("\"");
1178 break;
1179
1180 default:
1181 for (i = 2; i < length; i++)
1182 netprintf(" ?%d?", pointer[i]);
1183 break;
1184 }
1185 break;
1186 #endif
1187
1188 #ifdef ENCRYPTION
1189 case TELOPT_ENCRYPT:
1190 netputs("ENCRYPT");
1191 if (length < 2) {
1192 netputs(" (empty suboption??\?)");
1193 break;
1194 }
1195 switch (pointer[1]) {
1196 case ENCRYPT_START:
1197 netputs(" START");
1198 break;
1199
1200 case ENCRYPT_END:
1201 netputs(" END");
1202 break;
1203
1204 case ENCRYPT_REQSTART:
1205 netputs(" REQUEST-START");
1206 break;
1207
1208 case ENCRYPT_REQEND:
1209 netputs(" REQUEST-END");
1210 break;
1211
1212 case ENCRYPT_IS:
1213 case ENCRYPT_REPLY:
1214 netputs((pointer[1] == ENCRYPT_IS)
1215 ? " IS " : " REPLY ");
1216 if (length < 3) {
1217 netputs(" (partial suboption??\?)");
1218 nfrontp += strlen(nfrontp);
1219 break;
1220 }
1221 if (ENCTYPE_NAME_OK(pointer[2]))
1222 netputs(ENCTYPE_NAME(pointer[2]));
1223 else
1224 netprintf("%d (unknown)", pointer[2]);
1225 netputs(" ");
1226
1227 encrypt_printsub(&pointer[1], length - 1,
1228 (unsigned char *) buf, sizeof(buf));
1229 netputs(buf);
1230 break;
1231
1232 case ENCRYPT_SUPPORT:
1233 i = 2;
1234 netputs(" SUPPORT ");
1235 nfrontp += strlen(nfrontp);
1236 while (i < length) {
1237 if (ENCTYPE_NAME_OK(pointer[i]))
1238 netputs(ENCTYPE_NAME(pointer[i]));
1239 else
1240 netprintf("%d", pointer[i]);
1241 netputs(" ");
1242 i++;
1243 }
1244 break;
1245
1246 case ENCRYPT_ENC_KEYID:
1247 netputs(" ENC_KEYID");
1248 goto encommon;
1249
1250 case ENCRYPT_DEC_KEYID:
1251 netputs(" DEC_KEYID");
1252 goto encommon;
1253
1254 default:
1255 netprintf(" %d (unknown)", pointer[1]);
1256 encommon:
1257 for (i = 2; i < length; i++)
1258 netprintf(" %d", pointer[i]);
1259 break;
1260 }
1261 break;
1262 #endif /* ENCRYPTION */
1263
1264 default:
1265 if (TELOPT_OK(pointer[0]))
1266 netputs(TELOPT(pointer[0]));
1267 else
1268 netprintf("%d", pointer[0]);
1269 netputs(" (unknown)");
1270 for (i = 1; i < length; i++)
1271 netprintf(" %d", pointer[i]);
1272 break;
1273 }
1274 netputs("\r\n");
1275 }
1276
1277 /*
1278 * Dump a data buffer in hex and ascii to the output data stream.
1279 */
1280 void
printdata(tag,ptr,cnt)1281 printdata(tag, ptr, cnt)
1282 register char *tag;
1283 register char *ptr;
1284 register int cnt;
1285 {
1286 register int i;
1287 char xbuf[30];
1288
1289 while (cnt) {
1290 /* add a line of output */
1291 netputs(tag);
1292 netputs(": ");
1293 for (i = 0; i < 20 && cnt; i++) {
1294 netprintf(nfrontp, "%02x", *ptr);
1295 nfrontp += strlen(nfrontp);
1296 if (isprint((int) *ptr)) {
1297 xbuf[i] = *ptr;
1298 } else {
1299 xbuf[i] = '.';
1300 }
1301 if (i % 2)
1302 netputs(" ");
1303 cnt--;
1304 ptr++;
1305 }
1306 xbuf[i] = '\0';
1307 netputs(" ");
1308 netputs(xbuf);
1309 netputs("\r\n");
1310 }
1311 }
1312 #endif /* DIAGNOSTICS */
1313