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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if 0
31 #ifndef lint
32 static const char sccsid[] = "@(#)utility.c 8.4 (Berkeley) 5/30/95";
33 #endif /* not lint */
34 #endif
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #ifdef __FreeBSD__
39 #include <locale.h>
40 #include <sys/utsname.h>
41 #endif
42 #include <string.h>
43 #define PRINTOPTIONS
44 #include "telnetd.h"
45
46 #ifdef 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
70 DIAG(TD_REPORT, output_data("td: ttloop\r\n"));
71 if (nfrontp - nbackp > 0) {
72 netflush();
73 }
74 ncc = read(net, netibuf, sizeof netibuf);
75 if (ncc < 0) {
76 syslog(LOG_INFO, "ttloop: read: %m");
77 exit(1);
78 } else if (ncc == 0) {
79 syslog(LOG_INFO, "ttloop: peer died: %m");
80 exit(1);
81 }
82 DIAG(TD_REPORT, output_data("td: ttloop read %d chars\r\n", ncc));
83 netip = netibuf;
84 telrcv(); /* state machine */
85 if (ncc > 0) {
86 pfrontp = pbackp = ptyobuf;
87 telrcv();
88 }
89 } /* end of ttloop */
90
91 /*
92 * Check a descriptor to see if out of band data exists on it.
93 */
94 int
stilloob(int s)95 stilloob(int s)
96 {
97 static struct timeval timeout = { 0, 0 };
98 fd_set excepts;
99 int value;
100
101 do {
102 FD_ZERO(&excepts);
103 FD_SET(s, &excepts);
104 memset((char *)&timeout, 0, sizeof timeout);
105 value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
106 } while ((value == -1) && (errno == EINTR));
107
108 if (value < 0) {
109 fatalperror(pty, "select");
110 }
111 if (FD_ISSET(s, &excepts)) {
112 return 1;
113 } else {
114 return 0;
115 }
116 }
117
118 void
ptyflush(void)119 ptyflush(void)
120 {
121 int n;
122
123 if ((n = pfrontp - pbackp) > 0) {
124 DIAG(TD_REPORT | TD_PTYDATA,
125 output_data("td: ptyflush %d chars\r\n", n));
126 DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
127 n = write(pty, pbackp, n);
128 }
129 if (n < 0) {
130 if (errno == EWOULDBLOCK || errno == EINTR)
131 return;
132 cleanup(0);
133 }
134 pbackp += n;
135 if (pbackp == pfrontp)
136 pbackp = pfrontp = ptyobuf;
137 }
138
139 /*
140 * nextitem()
141 *
142 * Return the address of the next "item" in the TELNET data
143 * stream. This will be the address of the next character if
144 * the current address is a user data character, or it will
145 * be the address of the character following the TELNET command
146 * if the current address is a TELNET IAC ("I Am a Command")
147 * character.
148 */
149 static char *
nextitem(char * current,const char * endp)150 nextitem(char *current, const char *endp)
151 {
152 if (current >= endp) {
153 return NULL;
154 }
155 if ((*current&0xff) != IAC) {
156 return current+1;
157 }
158 if (current+1 >= endp) {
159 return NULL;
160 }
161 switch (*(current+1)&0xff) {
162 case DO:
163 case DONT:
164 case WILL:
165 case WONT:
166 return current+3 <= endp ? current+3 : NULL;
167 case SB: /* loop forever looking for the SE */
168 {
169 char *look = current+2;
170
171 while (look < endp) {
172 if ((*look++&0xff) == IAC) {
173 if (look < endp && (*look++&0xff) == SE) {
174 return look;
175 }
176 }
177 }
178 return NULL;
179 }
180 default:
181 return current+2 <= endp ? current+2 : NULL;
182 }
183 } /* end of nextitem */
184
185 /*
186 * netclear()
187 *
188 * We are about to do a TELNET SYNCH operation. Clear
189 * the path to the network.
190 *
191 * Things are a bit tricky since we may have sent the first
192 * byte or so of a previous TELNET command into the network.
193 * So, we have to scan the network buffer from the beginning
194 * until we are up to where we want to be.
195 *
196 * A side effect of what we do, just to keep things
197 * simple, is to clear the urgent data pointer. The principal
198 * caller should be setting the urgent data pointer AFTER calling
199 * us in any case.
200 */
201 void
netclear(void)202 netclear(void)
203 {
204 char *thisitem, *next;
205 char *good;
206 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
207 (nfrontp > p+1) && ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
208
209 #ifdef ENCRYPTION
210 thisitem = nclearto > netobuf ? nclearto : netobuf;
211 #else /* ENCRYPTION */
212 thisitem = netobuf;
213 #endif /* ENCRYPTION */
214
215 while ((next = nextitem(thisitem, nbackp)) != NULL && (next <= nbackp)) {
216 thisitem = next;
217 }
218
219 /* Now, thisitem is first before/at boundary. */
220
221 #ifdef ENCRYPTION
222 good = nclearto > netobuf ? nclearto : netobuf;
223 #else /* ENCRYPTION */
224 good = netobuf; /* where the good bytes go */
225 #endif /* ENCRYPTION */
226
227 while ((thisitem != NULL) && (nfrontp > thisitem)) {
228 if (wewant(thisitem)) {
229 int length;
230
231 next = thisitem;
232 do {
233 next = nextitem(next, nfrontp);
234 } while ((next != NULL) && wewant(next) && (nfrontp > next));
235 if (next == NULL) {
236 next = nfrontp;
237 }
238 length = next-thisitem;
239 memmove(good, thisitem, length);
240 good += length;
241 thisitem = next;
242 } else {
243 thisitem = nextitem(thisitem, nfrontp);
244 }
245 }
246
247 nbackp = netobuf;
248 nfrontp = good; /* next byte to be sent */
249 neturg = 0;
250 } /* end of netclear */
251
252 /*
253 * netflush
254 * Send as much data as possible to the network,
255 * handling requests for urgent data.
256 */
257 void
netflush(void)258 netflush(void)
259 {
260 int n;
261 extern int not42;
262
263 while ((n = nfrontp - nbackp) > 0) {
264 #if 0
265 /* XXX This causes output_data() to recurse and die */
266 DIAG(TD_REPORT, {
267 n += output_data("td: netflush %d chars\r\n", n);
268 });
269 #endif
270 #ifdef ENCRYPTION
271 if (encrypt_output) {
272 char *s = nclearto ? nclearto : nbackp;
273 if (nfrontp - s > 0) {
274 (*encrypt_output)((unsigned char *)s, nfrontp-s);
275 nclearto = nfrontp;
276 }
277 }
278 #endif /* ENCRYPTION */
279 /*
280 * if no urgent data, or if the other side appears to be an
281 * old 4.2 client (and thus unable to survive TCP urgent data),
282 * write the entire buffer in non-OOB mode.
283 */
284 if ((neturg == 0) || (not42 == 0)) {
285 n = write(net, nbackp, n); /* normal write */
286 } else {
287 n = neturg - nbackp;
288 /*
289 * In 4.2 (and 4.3) systems, there is some question about
290 * what byte in a sendOOB operation is the "OOB" data.
291 * To make ourselves compatible, we only send ONE byte
292 * out of band, the one WE THINK should be OOB (though
293 * we really have more the TCP philosophy of urgent data
294 * rather than the Unix philosophy of OOB data).
295 */
296 if (n > 1) {
297 n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */
298 } else {
299 n = send(net, nbackp, n, MSG_OOB); /* URGENT data */
300 }
301 }
302 if (n == -1) {
303 if (errno == EWOULDBLOCK || errno == EINTR)
304 continue;
305 cleanup(0);
306 /* NOTREACHED */
307 }
308 nbackp += n;
309 #ifdef ENCRYPTION
310 if (nbackp > nclearto)
311 nclearto = 0;
312 #endif /* ENCRYPTION */
313 if (nbackp >= neturg) {
314 neturg = 0;
315 }
316 if (nbackp == nfrontp) {
317 nbackp = nfrontp = netobuf;
318 #ifdef ENCRYPTION
319 nclearto = 0;
320 #endif /* ENCRYPTION */
321 }
322 }
323 return;
324 } /* end of netflush */
325
326
327 /*
328 * miscellaneous functions doing a variety of little jobs follow ...
329 */
330
331
332 void
fatal(int f,const char * msg)333 fatal(int f, const char *msg)
334 {
335 char buf[BUFSIZ];
336
337 (void) snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
338 #ifdef ENCRYPTION
339 if (encrypt_output) {
340 /*
341 * Better turn off encryption first....
342 * Hope it flushes...
343 */
344 encrypt_send_end();
345 netflush();
346 }
347 #endif /* ENCRYPTION */
348 (void) write(f, buf, (int)strlen(buf));
349 sleep(1); /*XXX*/
350 exit(1);
351 }
352
353 void
fatalperror(int f,const char * msg)354 fatalperror(int f, const char *msg)
355 {
356 char buf[BUFSIZ];
357
358 (void) snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(errno));
359 fatal(f, buf);
360 }
361
362 char editedhost[32];
363
364 void
edithost(char * pat,char * host)365 edithost(char *pat, char *host)
366 {
367 char *res = editedhost;
368
369 if (pat) {
370 while (*pat) {
371 switch (*pat) {
372
373 case '#':
374 if (*host)
375 host++;
376 break;
377
378 case '@':
379 if (*host)
380 *res++ = *host++;
381 break;
382
383 default:
384 *res++ = *pat;
385 break;
386 }
387 if (res == &editedhost[sizeof editedhost - 1]) {
388 *res = '\0';
389 return;
390 }
391 pat++;
392 }
393 }
394 if (*host)
395 (void) strncpy(res, host,
396 sizeof editedhost - (res - editedhost) -1);
397 else
398 *res = '\0';
399 editedhost[sizeof editedhost - 1] = '\0';
400 }
401
402 static char *putlocation;
403
404 static void
putstr(const char * s)405 putstr(const char *s)
406 {
407
408 while (*s)
409 putchr(*s++);
410 }
411
412 void
putchr(int cc)413 putchr(int cc)
414 {
415 *putlocation++ = cc;
416 }
417
418 #ifdef __FreeBSD__
419 static char fmtstr[] = { "%+" };
420 #else
421 static char fmtstr[] = { "%l:%M%P on %A, %d %B %Y" };
422 #endif
423
424 void
putf(char * cp,char * where)425 putf(char *cp, char *where)
426 {
427 char *slash;
428 time_t t;
429 char db[100];
430 #ifdef __FreeBSD__
431 static struct utsname kerninfo;
432
433 if (!*kerninfo.sysname)
434 uname(&kerninfo);
435 #endif
436
437 putlocation = where;
438
439 while (*cp) {
440 if (*cp =='\n') {
441 putstr("\r\n");
442 cp++;
443 continue;
444 } else if (*cp != '%') {
445 putchr(*cp++);
446 continue;
447 }
448 switch (*++cp) {
449
450 case 't':
451 #ifdef STREAMSPTY
452 /* names are like /dev/pts/2 -- we want pts/2 */
453 slash = strchr(line+1, '/');
454 #else
455 slash = strrchr(line, '/');
456 #endif
457 if (slash == (char *) 0)
458 putstr(line);
459 else
460 putstr(&slash[1]);
461 break;
462
463 case 'h':
464 putstr(editedhost);
465 break;
466
467 case 'd':
468 #ifdef __FreeBSD__
469 setlocale(LC_TIME, "");
470 #endif
471 (void)time(&t);
472 (void)strftime(db, sizeof(db), fmtstr, localtime(&t));
473 putstr(db);
474 break;
475
476 #ifdef __FreeBSD__
477 case 's':
478 putstr(kerninfo.sysname);
479 break;
480
481 case 'm':
482 putstr(kerninfo.machine);
483 break;
484
485 case 'r':
486 putstr(kerninfo.release);
487 break;
488
489 case 'v':
490 putstr(kerninfo.version);
491 break;
492 #endif
493
494 case '%':
495 putchr('%');
496 break;
497 }
498 cp++;
499 }
500 }
501
502 #ifdef DIAGNOSTICS
503 /*
504 * Print telnet options and commands in plain text, if possible.
505 */
506 void
printoption(const char * fmt,int option)507 printoption(const char *fmt, int option)
508 {
509 if (TELOPT_OK(option))
510 output_data("%s %s\r\n", fmt, TELOPT(option));
511 else if (TELCMD_OK(option))
512 output_data("%s %s\r\n", fmt, TELCMD(option));
513 else
514 output_data("%s %d\r\n", fmt, option);
515 return;
516 }
517
518 void
printsub(char direction,unsigned char * pointer,int length)519 printsub(char direction, unsigned char *pointer, int length)
520 {
521 int i = 0;
522
523 if (!(diagnostic & TD_OPTIONS))
524 return;
525
526 if (direction) {
527 output_data("td: %s suboption ",
528 direction == '<' ? "recv" : "send");
529 if (length >= 3) {
530 int j;
531
532 i = pointer[length-2];
533 j = pointer[length-1];
534
535 if (i != IAC || j != SE) {
536 output_data("(terminated by ");
537 if (TELOPT_OK(i))
538 output_data("%s ", TELOPT(i));
539 else if (TELCMD_OK(i))
540 output_data("%s ", TELCMD(i));
541 else
542 output_data("%d ", i);
543 if (TELOPT_OK(j))
544 output_data("%s", TELOPT(j));
545 else if (TELCMD_OK(j))
546 output_data("%s", TELCMD(j));
547 else
548 output_data("%d", j);
549 output_data(", not IAC SE!) ");
550 }
551 }
552 length -= 2;
553 }
554 if (length < 1) {
555 output_data("(Empty suboption??\?)");
556 return;
557 }
558 switch (pointer[0]) {
559 case TELOPT_TTYPE:
560 output_data("TERMINAL-TYPE ");
561 switch (pointer[1]) {
562 case TELQUAL_IS:
563 output_data("IS \"%.*s\"", length-2, (char *)pointer+2);
564 break;
565 case TELQUAL_SEND:
566 output_data("SEND");
567 break;
568 default:
569 output_data(
570 "- unknown qualifier %d (0x%x).",
571 pointer[1], pointer[1]);
572 }
573 break;
574 case TELOPT_TSPEED:
575 output_data("TERMINAL-SPEED");
576 if (length < 2) {
577 output_data(" (empty suboption??\?)");
578 break;
579 }
580 switch (pointer[1]) {
581 case TELQUAL_IS:
582 output_data(" IS %.*s", length-2, (char *)pointer+2);
583 break;
584 default:
585 if (pointer[1] == 1)
586 output_data(" SEND");
587 else
588 output_data(" %d (unknown)", pointer[1]);
589 for (i = 2; i < length; i++) {
590 output_data(" ?%d?", pointer[i]);
591 }
592 break;
593 }
594 break;
595
596 case TELOPT_LFLOW:
597 output_data("TOGGLE-FLOW-CONTROL");
598 if (length < 2) {
599 output_data(" (empty suboption??\?)");
600 break;
601 }
602 switch (pointer[1]) {
603 case LFLOW_OFF:
604 output_data(" OFF"); break;
605 case LFLOW_ON:
606 output_data(" ON"); break;
607 case LFLOW_RESTART_ANY:
608 output_data(" RESTART-ANY"); break;
609 case LFLOW_RESTART_XON:
610 output_data(" RESTART-XON"); break;
611 default:
612 output_data(" %d (unknown)", pointer[1]);
613 }
614 for (i = 2; i < length; i++) {
615 output_data(" ?%d?", pointer[i]);
616 }
617 break;
618
619 case TELOPT_NAWS:
620 output_data("NAWS");
621 if (length < 2) {
622 output_data(" (empty suboption??\?)");
623 break;
624 }
625 if (length == 2) {
626 output_data(" ?%d?", pointer[1]);
627 break;
628 }
629 output_data(" %d %d (%d)",
630 pointer[1], pointer[2],
631 (int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
632 if (length == 4) {
633 output_data(" ?%d?", pointer[3]);
634 break;
635 }
636 output_data(" %d %d (%d)",
637 pointer[3], pointer[4],
638 (int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
639 for (i = 5; i < length; i++) {
640 output_data(" ?%d?", pointer[i]);
641 }
642 break;
643
644 case TELOPT_LINEMODE:
645 output_data("LINEMODE ");
646 if (length < 2) {
647 output_data(" (empty suboption??\?)");
648 break;
649 }
650 switch (pointer[1]) {
651 case WILL:
652 output_data("WILL ");
653 goto common;
654 case WONT:
655 output_data("WONT ");
656 goto common;
657 case DO:
658 output_data("DO ");
659 goto common;
660 case DONT:
661 output_data("DONT ");
662 common:
663 if (length < 3) {
664 output_data("(no option??\?)");
665 break;
666 }
667 switch (pointer[2]) {
668 case LM_FORWARDMASK:
669 output_data("Forward Mask");
670 for (i = 3; i < length; i++) {
671 output_data(" %x", pointer[i]);
672 }
673 break;
674 default:
675 output_data("%d (unknown)", pointer[2]);
676 for (i = 3; i < length; i++) {
677 output_data(" %d", pointer[i]);
678 }
679 break;
680 }
681 break;
682
683 case LM_SLC:
684 output_data("SLC");
685 for (i = 2; i < length - 2; i += 3) {
686 if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
687 output_data(" %s", SLC_NAME(pointer[i+SLC_FUNC]));
688 else
689 output_data(" %d", pointer[i+SLC_FUNC]);
690 switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
691 case SLC_NOSUPPORT:
692 output_data(" NOSUPPORT"); break;
693 case SLC_CANTCHANGE:
694 output_data(" CANTCHANGE"); break;
695 case SLC_VARIABLE:
696 output_data(" VARIABLE"); break;
697 case SLC_DEFAULT:
698 output_data(" DEFAULT"); break;
699 }
700 output_data("%s%s%s",
701 pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
702 pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
703 pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
704 if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
705 SLC_FLUSHOUT| SLC_LEVELBITS)) {
706 output_data("(0x%x)", pointer[i+SLC_FLAGS]);
707 }
708 output_data(" %d;", pointer[i+SLC_VALUE]);
709 if ((pointer[i+SLC_VALUE] == IAC) &&
710 (pointer[i+SLC_VALUE+1] == IAC))
711 i++;
712 }
713 for (; i < length; i++) {
714 output_data(" ?%d?", pointer[i]);
715 }
716 break;
717
718 case LM_MODE:
719 output_data("MODE ");
720 if (length < 3) {
721 output_data("(no mode??\?)");
722 break;
723 }
724 {
725 char tbuf[32];
726 sprintf(tbuf, "%s%s%s%s%s",
727 pointer[2]&MODE_EDIT ? "|EDIT" : "",
728 pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
729 pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
730 pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
731 pointer[2]&MODE_ACK ? "|ACK" : "");
732 output_data("%s", tbuf[1] ? &tbuf[1] : "0");
733 }
734 if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
735 output_data(" (0x%x)", pointer[2]);
736 }
737 for (i = 3; i < length; i++) {
738 output_data(" ?0x%x?", pointer[i]);
739 }
740 break;
741 default:
742 output_data("%d (unknown)", pointer[1]);
743 for (i = 2; i < length; i++) {
744 output_data(" %d", pointer[i]);
745 }
746 }
747 break;
748
749 case TELOPT_STATUS: {
750 const char *cp;
751 int j, k;
752
753 output_data("STATUS");
754
755 switch (pointer[1]) {
756 default:
757 if (pointer[1] == TELQUAL_SEND)
758 output_data(" SEND");
759 else
760 output_data(" %d (unknown)", pointer[1]);
761 for (i = 2; i < length; i++) {
762 output_data(" ?%d?", pointer[i]);
763 }
764 break;
765 case TELQUAL_IS:
766 output_data(" IS\r\n");
767
768 for (i = 2; i < length; i++) {
769 switch(pointer[i]) {
770 case DO: cp = "DO"; goto common2;
771 case DONT: cp = "DONT"; goto common2;
772 case WILL: cp = "WILL"; goto common2;
773 case WONT: cp = "WONT"; goto common2;
774 common2:
775 i++;
776 if (TELOPT_OK(pointer[i]))
777 output_data(" %s %s", cp, TELOPT(pointer[i]));
778 else
779 output_data(" %s %d", cp, pointer[i]);
780
781 output_data("\r\n");
782 break;
783
784 case SB:
785 output_data(" SB ");
786 i++;
787 j = k = i;
788 while (j < length) {
789 if (pointer[j] == SE) {
790 if (j+1 == length)
791 break;
792 if (pointer[j+1] == SE)
793 j++;
794 else
795 break;
796 }
797 pointer[k++] = pointer[j++];
798 }
799 printsub(0, &pointer[i], k - i);
800 if (i < length) {
801 output_data(" SE");
802 i = j;
803 } else
804 i = j - 1;
805
806 output_data("\r\n");
807
808 break;
809
810 default:
811 output_data(" %d", pointer[i]);
812 break;
813 }
814 }
815 break;
816 }
817 break;
818 }
819
820 case TELOPT_XDISPLOC:
821 output_data("X-DISPLAY-LOCATION ");
822 switch (pointer[1]) {
823 case TELQUAL_IS:
824 output_data("IS \"%.*s\"", length-2, (char *)pointer+2);
825 break;
826 case TELQUAL_SEND:
827 output_data("SEND");
828 break;
829 default:
830 output_data("- unknown qualifier %d (0x%x).",
831 pointer[1], pointer[1]);
832 }
833 break;
834
835 case TELOPT_NEW_ENVIRON:
836 output_data("NEW-ENVIRON ");
837 goto env_common1;
838 case TELOPT_OLD_ENVIRON:
839 output_data("OLD-ENVIRON");
840 env_common1:
841 switch (pointer[1]) {
842 case TELQUAL_IS:
843 output_data("IS ");
844 goto env_common;
845 case TELQUAL_SEND:
846 output_data("SEND ");
847 goto env_common;
848 case TELQUAL_INFO:
849 output_data("INFO ");
850 env_common:
851 {
852 int noquote = 2;
853 for (i = 2; i < length; i++ ) {
854 switch (pointer[i]) {
855 case NEW_ENV_VAR:
856 output_data("%s", "\" VAR " + noquote);
857 noquote = 2;
858 break;
859
860 case NEW_ENV_VALUE:
861 output_data("%s", "\" VALUE " + noquote);
862 noquote = 2;
863 break;
864
865 case ENV_ESC:
866 output_data("%s", "\" ESC " + noquote);
867 noquote = 2;
868 break;
869
870 case ENV_USERVAR:
871 output_data("%s", "\" USERVAR " + noquote);
872 noquote = 2;
873 break;
874
875 default:
876 if (isprint(pointer[i]) && pointer[i] != '"') {
877 if (noquote) {
878 output_data("\"");
879 noquote = 0;
880 }
881 output_data("%c", pointer[i]);
882 } else {
883 output_data("\" %03o " + noquote,
884 pointer[i]);
885 noquote = 2;
886 }
887 break;
888 }
889 }
890 if (!noquote)
891 output_data("\"");
892 break;
893 }
894 }
895 break;
896
897 #ifdef AUTHENTICATION
898 case TELOPT_AUTHENTICATION:
899 output_data("AUTHENTICATION");
900
901 if (length < 2) {
902 output_data(" (empty suboption??\?)");
903 break;
904 }
905 switch (pointer[1]) {
906 case TELQUAL_REPLY:
907 case TELQUAL_IS:
908 output_data(" %s ", (pointer[1] == TELQUAL_IS) ?
909 "IS" : "REPLY");
910 if (AUTHTYPE_NAME_OK(pointer[2]))
911 output_data("%s ", AUTHTYPE_NAME(pointer[2]));
912 else
913 output_data("%d ", pointer[2]);
914 if (length < 3) {
915 output_data("(partial suboption??\?)");
916 break;
917 }
918 output_data("%s|%s",
919 ((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
920 "CLIENT" : "SERVER",
921 ((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
922 "MUTUAL" : "ONE-WAY");
923
924 {
925 char buf[512];
926 auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
927 output_data("%s", buf);
928 }
929 break;
930
931 case TELQUAL_SEND:
932 i = 2;
933 output_data(" SEND ");
934 while (i < length) {
935 if (AUTHTYPE_NAME_OK(pointer[i]))
936 output_data("%s ", AUTHTYPE_NAME(pointer[i]));
937 else
938 output_data("%d ", pointer[i]);
939 if (++i >= length) {
940 output_data("(partial suboption??\?)");
941 break;
942 }
943 output_data("%s|%s ",
944 ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
945 "CLIENT" : "SERVER",
946 ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
947 "MUTUAL" : "ONE-WAY");
948 ++i;
949 }
950 break;
951
952 case TELQUAL_NAME:
953 output_data(" NAME \"%.*s\"", length - 2, pointer + 2);
954 break;
955
956 default:
957 for (i = 2; i < length; i++) {
958 output_data(" ?%d?", pointer[i]);
959 }
960 break;
961 }
962 break;
963 #endif
964
965 #ifdef ENCRYPTION
966 case TELOPT_ENCRYPT:
967 output_data("ENCRYPT");
968 if (length < 2) {
969 output_data(" (empty suboption??\?)");
970 break;
971 }
972 switch (pointer[1]) {
973 case ENCRYPT_START:
974 output_data(" START");
975 break;
976
977 case ENCRYPT_END:
978 output_data(" END");
979 break;
980
981 case ENCRYPT_REQSTART:
982 output_data(" REQUEST-START");
983 break;
984
985 case ENCRYPT_REQEND:
986 output_data(" REQUEST-END");
987 break;
988
989 case ENCRYPT_IS:
990 case ENCRYPT_REPLY:
991 output_data(" %s ", (pointer[1] == ENCRYPT_IS) ?
992 "IS" : "REPLY");
993 if (length < 3) {
994 output_data(" (partial suboption??\?)");
995 break;
996 }
997 if (ENCTYPE_NAME_OK(pointer[2]))
998 output_data("%s ", ENCTYPE_NAME(pointer[2]));
999 else
1000 output_data(" %d (unknown)", pointer[2]);
1001
1002 {
1003 char buf[512];
1004 encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
1005 output_data("%s", buf);
1006 }
1007 break;
1008
1009 case ENCRYPT_SUPPORT:
1010 i = 2;
1011 output_data(" SUPPORT ");
1012 while (i < length) {
1013 if (ENCTYPE_NAME_OK(pointer[i]))
1014 output_data("%s ", ENCTYPE_NAME(pointer[i]));
1015 else
1016 output_data("%d ", pointer[i]);
1017 i++;
1018 }
1019 break;
1020
1021 case ENCRYPT_ENC_KEYID:
1022 output_data(" ENC_KEYID");
1023 goto encommon;
1024
1025 case ENCRYPT_DEC_KEYID:
1026 output_data(" DEC_KEYID");
1027 goto encommon;
1028
1029 default:
1030 output_data(" %d (unknown)", pointer[1]);
1031 encommon:
1032 for (i = 2; i < length; i++) {
1033 output_data(" %d", pointer[i]);
1034 }
1035 break;
1036 }
1037 break;
1038 #endif /* ENCRYPTION */
1039
1040 default:
1041 if (TELOPT_OK(pointer[0]))
1042 output_data("%s (unknown)", TELOPT(pointer[0]));
1043 else
1044 output_data("%d (unknown)", pointer[i]);
1045 for (i = 1; i < length; i++) {
1046 output_data(" %d", pointer[i]);
1047 }
1048 break;
1049 }
1050 output_data("\r\n");
1051 }
1052
1053 /*
1054 * Dump a data buffer in hex and ascii to the output data stream.
1055 */
1056 void
printdata(const char * tag,char * ptr,int cnt)1057 printdata(const char *tag, char *ptr, int cnt)
1058 {
1059 int i;
1060 char xbuf[30];
1061
1062 while (cnt) {
1063 /* flush net output buffer if no room for new data) */
1064 if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
1065 netflush();
1066 }
1067
1068 /* add a line of output */
1069 output_data("%s: ", tag);
1070 for (i = 0; i < 20 && cnt; i++) {
1071 output_data("%02x", *ptr);
1072 if (isprint(*ptr)) {
1073 xbuf[i] = *ptr;
1074 } else {
1075 xbuf[i] = '.';
1076 }
1077 if (i % 2) {
1078 output_data(" ");
1079 }
1080 cnt--;
1081 ptr++;
1082 }
1083 xbuf[i] = '\0';
1084 output_data(" %s\r\n", xbuf );
1085 }
1086 }
1087 #endif /* DIAGNOSTICS */
1088