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 #define PRINTOPTIONS
35 #include "telnetd.h"
36
37 RCSID("$Id$");
38
39 /*
40 * utility functions performing io related tasks
41 */
42
43 /*
44 * ttloop
45 *
46 * A small subroutine to flush the network output buffer, get some
47 * data from the network, and pass it through the telnet state
48 * machine. We also flush the pty input buffer (by dropping its data)
49 * if it becomes too full.
50 *
51 * return 0 if OK or 1 if interrupted by a signal.
52 */
53
54 int
ttloop(void)55 ttloop(void)
56 {
57 DIAG(TD_REPORT, {
58 output_data("td: ttloop\r\n");
59 });
60 if (nfrontp-nbackp)
61 netflush();
62 ncc = read(net, netibuf, sizeof netibuf);
63 if (ncc < 0) {
64 if (errno == EINTR)
65 return 1;
66 syslog(LOG_INFO, "ttloop: read: %m\n");
67 exit(1);
68 } else if (ncc == 0) {
69 syslog(LOG_INFO, "ttloop: peer died\n");
70 exit(1);
71 }
72 DIAG(TD_REPORT, {
73 output_data("td: ttloop read %d chars\r\n", ncc);
74 });
75 netip = netibuf;
76 telrcv(); /* state machine */
77 if (ncc > 0) {
78 pfrontp = pbackp = ptyobuf;
79 telrcv();
80 }
81 return 0;
82 } /* end of ttloop */
83
84 /*
85 * Check a descriptor to see if out of band data exists on it.
86 */
87 int
stilloob(int s)88 stilloob(int s)
89 {
90 static struct timeval timeout = { 0 };
91 fd_set excepts;
92 int value;
93
94 if (s >= FD_SETSIZE)
95 fatal(ourpty, "fd too large");
96
97 do {
98 FD_ZERO(&excepts);
99 FD_SET(s, &excepts);
100 value = select(s+1, 0, 0, &excepts, &timeout);
101 } while ((value == -1) && (errno == EINTR));
102
103 if (value < 0) {
104 fatalperror(ourpty, "select");
105 }
106 if (FD_ISSET(s, &excepts)) {
107 return 1;
108 } else {
109 return 0;
110 }
111 }
112
113 void
ptyflush(void)114 ptyflush(void)
115 {
116 int n;
117
118 if ((n = pfrontp - pbackp) > 0) {
119 DIAG((TD_REPORT | TD_PTYDATA), {
120 output_data("td: ptyflush %d chars\r\n", n);
121 });
122 DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
123 n = write(ourpty, pbackp, n);
124 }
125 if (n < 0) {
126 if (errno == EWOULDBLOCK || errno == EINTR)
127 return;
128 cleanup(0);
129 }
130 pbackp += n;
131 if (pbackp == pfrontp)
132 pbackp = pfrontp = ptyobuf;
133 }
134
135 /*
136 * nextitem()
137 *
138 * Return the address of the next "item" in the TELNET data
139 * stream. This will be the address of the next character if
140 * the current address is a user data character, or it will
141 * be the address of the character following the TELNET command
142 * if the current address is a TELNET IAC ("I Am a Command")
143 * character.
144 */
145 char *
nextitem(char * current)146 nextitem(char *current)
147 {
148 if ((*current&0xff) != IAC) {
149 return current+1;
150 }
151 switch (*(current+1)&0xff) {
152 case DO:
153 case DONT:
154 case WILL:
155 case WONT:
156 return current+3;
157 case SB:{
158 /* loop forever looking for the SE */
159 char *look = current+2;
160
161 for (;;) {
162 if ((*look++&0xff) == IAC) {
163 if ((*look++&0xff) == SE) {
164 return look;
165 }
166 }
167 }
168 }
169 default:
170 return current+2;
171 }
172 }
173
174
175 /*
176 * netclear()
177 *
178 * We are about to do a TELNET SYNCH operation. Clear
179 * the path to the network.
180 *
181 * Things are a bit tricky since we may have sent the first
182 * byte or so of a previous TELNET command into the network.
183 * So, we have to scan the network buffer from the beginning
184 * until we are up to where we want to be.
185 *
186 * A side effect of what we do, just to keep things
187 * simple, is to clear the urgent data pointer. The principal
188 * caller should be setting the urgent data pointer AFTER calling
189 * us in any case.
190 */
191 void
netclear(void)192 netclear(void)
193 {
194 char *thisitem, *next;
195 char *good;
196 #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
197 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
198
199 #ifdef ENCRYPTION
200 thisitem = nclearto > netobuf ? nclearto : netobuf;
201 #else
202 thisitem = netobuf;
203 #endif
204
205 while ((next = nextitem(thisitem)) <= nbackp) {
206 thisitem = next;
207 }
208
209 /* Now, thisitem is first before/at boundary. */
210
211 #ifdef ENCRYPTION
212 good = nclearto > netobuf ? nclearto : netobuf;
213 #else
214 good = netobuf; /* where the good bytes go */
215 #endif
216
217 while (nfrontp > thisitem) {
218 if (wewant(thisitem)) {
219 int length;
220
221 next = thisitem;
222 do {
223 next = nextitem(next);
224 } while (wewant(next) && (nfrontp > next));
225 length = next-thisitem;
226 memmove(good, thisitem, length);
227 good += length;
228 thisitem = next;
229 } else {
230 thisitem = nextitem(thisitem);
231 }
232 }
233
234 nbackp = netobuf;
235 nfrontp = good; /* next byte to be sent */
236 neturg = 0;
237 } /* end of netclear */
238
239 extern int not42;
240
241 /*
242 * netflush
243 * Send as much data as possible to the network,
244 * handling requests for urgent data.
245 */
246 void
netflush(void)247 netflush(void)
248 {
249 int n;
250
251 if ((n = nfrontp - nbackp) > 0) {
252 DIAG(TD_REPORT,
253 { n += output_data("td: netflush %d chars\r\n", n);
254 });
255 #ifdef ENCRYPTION
256 if (encrypt_output) {
257 char *s = nclearto ? nclearto : nbackp;
258 if (nfrontp - s > 0) {
259 (*encrypt_output)((unsigned char *)s, nfrontp-s);
260 nclearto = nfrontp;
261 }
262 }
263 #endif
264 /*
265 * if no urgent data, or if the other side appears to be an
266 * old 4.2 client (and thus unable to survive TCP urgent data),
267 * write the entire buffer in non-OOB mode.
268 */
269 #if 1 /* remove this to make it work between solaris 2.6 and linux */
270 if ((neturg == 0) || (not42 == 0)) {
271 #endif
272 n = write(net, nbackp, n); /* normal write */
273 #if 1 /* remove this to make it work between solaris 2.6 and linux */
274 } else {
275 n = neturg - nbackp;
276 /*
277 * In 4.2 (and 4.3) systems, there is some question about
278 * what byte in a sendOOB operation is the "OOB" data.
279 * To make ourselves compatible, we only send ONE byte
280 * out of band, the one WE THINK should be OOB (though
281 * we really have more the TCP philosophy of urgent data
282 * rather than the Unix philosophy of OOB data).
283 */
284 if (n > 1) {
285 n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */
286 } else {
287 n = send(net, nbackp, n, MSG_OOB); /* URGENT data */
288 }
289 }
290 #endif
291 }
292 if (n < 0) {
293 if (errno == EWOULDBLOCK || errno == EINTR)
294 return;
295 cleanup(0);
296 }
297 nbackp += n;
298 #ifdef ENCRYPTION
299 if (nbackp > nclearto)
300 nclearto = 0;
301 #endif
302 if (nbackp >= neturg) {
303 neturg = 0;
304 }
305 if (nbackp == nfrontp) {
306 nbackp = nfrontp = netobuf;
307 #ifdef ENCRYPTION
308 nclearto = 0;
309 #endif
310 }
311 return;
312 }
313
314
315 /*
316 * writenet
317 *
318 * Just a handy little function to write a bit of raw data to the net.
319 * It will force a transmit of the buffer if necessary
320 *
321 * arguments
322 * ptr - A pointer to a character string to write
323 * len - How many bytes to write
324 */
325 void
writenet(const void * ptr,size_t len)326 writenet(const void *ptr, size_t len)
327 {
328 /* flush buffer if no room for new data) */
329 while ((&netobuf[BUFSIZ] - nfrontp) < len) {
330 /* if this fails, don't worry, buffer is a little big */
331 netflush();
332 }
333 if ((&netobuf[BUFSIZ] - nfrontp) < len)
334 abort();
335
336 memmove(nfrontp, ptr, len);
337 nfrontp += len;
338 }
339
340
341 /*
342 * miscellaneous functions doing a variety of little jobs follow ...
343 */
344
345
fatal(int f,char * msg)346 void fatal(int f, char *msg)
347 {
348 char buf[BUFSIZ];
349
350 snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
351 #ifdef ENCRYPTION
352 if (encrypt_output) {
353 /*
354 * Better turn off encryption first....
355 * Hope it flushes...
356 */
357 encrypt_send_end();
358 netflush();
359 }
360 #endif
361 write(f, buf, (int)strlen(buf));
362 sleep(1); /*XXX*/
363 exit(1);
364 }
365
366 void
fatalperror_errno(int f,const char * msg,int error)367 fatalperror_errno(int f, const char *msg, int error)
368 {
369 char buf[BUFSIZ];
370
371 snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(error));
372 fatal(f, buf);
373 }
374
375 void
fatalperror(int f,const char * msg)376 fatalperror(int f, const char *msg)
377 {
378 fatalperror_errno(f, msg, errno);
379 }
380
381 char editedhost[32];
382
edithost(char * pat,char * host)383 void edithost(char *pat, char *host)
384 {
385 char *res = editedhost;
386
387 if (!pat)
388 pat = "";
389 while (*pat) {
390 switch (*pat) {
391
392 case '#':
393 if (*host)
394 host++;
395 break;
396
397 case '@':
398 if (*host)
399 *res++ = *host++;
400 break;
401
402 default:
403 *res++ = *pat;
404 break;
405 }
406 if (res == &editedhost[sizeof editedhost - 1]) {
407 *res = '\0';
408 return;
409 }
410 pat++;
411 }
412 if (*host)
413 strlcpy (res, host,
414 sizeof editedhost - (res - editedhost));
415 else
416 *res = '\0';
417 editedhost[sizeof editedhost - 1] = '\0';
418 }
419
420 static char *putlocation;
421
422 void
putstr(char * s)423 putstr(char *s)
424 {
425
426 while (*s)
427 putchr(*s++);
428 }
429
430 void
putchr(int cc)431 putchr(int cc)
432 {
433 *putlocation++ = cc;
434 }
435
436 static char fmtstr[] = { "%l:%M%P on %A, %d %B %Y" };
437
putf(char * cp,char * where)438 void putf(char *cp, char *where)
439 {
440 #ifdef HAVE_UNAME
441 struct utsname name;
442 #endif
443 char *slash;
444 time_t t;
445 char db[100];
446
447 /* if we don't have uname, set these to sensible values */
448 char *sysname = "Unix",
449 *machine = "",
450 *release = "",
451 *version = "";
452
453 #ifdef HAVE_UNAME
454 uname(&name);
455 sysname=name.sysname;
456 machine=name.machine;
457 release=name.release;
458 version=name.version;
459 #endif
460
461 putlocation = where;
462
463 while (*cp) {
464 if (*cp != '%') {
465 putchr(*cp++);
466 continue;
467 }
468 switch (*++cp) {
469
470 case 't':
471 slash = strchr(line+1, '/');
472 if (slash == (char *) 0)
473 putstr(line);
474 else
475 putstr(&slash[1]);
476 break;
477
478 case 'h':
479 putstr(editedhost);
480 break;
481
482 case 's':
483 putstr(sysname);
484 break;
485
486 case 'm':
487 putstr(machine);
488 break;
489
490 case 'r':
491 putstr(release);
492 break;
493
494 case 'v':
495 putstr(version);
496 break;
497
498 case 'd':
499 time(&t);
500 strftime(db, sizeof(db), fmtstr, localtime(&t));
501 putstr(db);
502 break;
503
504 case '%':
505 putchr('%');
506 break;
507 }
508 cp++;
509 }
510 }
511
512 #ifdef DIAGNOSTICS
513 /*
514 * Print telnet options and commands in plain text, if possible.
515 */
516 void
printoption(char * fmt,int option)517 printoption(char *fmt, int option)
518 {
519 if (TELOPT_OK(option))
520 output_data("%s %s\r\n",
521 fmt,
522 TELOPT(option));
523 else if (TELCMD_OK(option))
524 output_data("%s %s\r\n",
525 fmt,
526 TELCMD(option));
527 else
528 output_data("%s %d\r\n",
529 fmt,
530 option);
531 return;
532 }
533
534 void
printsub(int direction,unsigned char * pointer,size_t length)535 printsub(int direction, unsigned char *pointer, size_t length)
536 /* '<' or '>' */
537 /* where suboption data sits */
538 /* length of suboption data */
539 {
540 int i = 0;
541 unsigned char buf[512];
542
543 if (!(diagnostic & TD_OPTIONS))
544 return;
545
546 if (direction) {
547 output_data("td: %s suboption ",
548 direction == '<' ? "recv" : "send");
549 if (length >= 3) {
550 int j;
551
552 i = pointer[length-2];
553 j = pointer[length-1];
554
555 if (i != IAC || j != SE) {
556 output_data("(terminated by ");
557 if (TELOPT_OK(i))
558 output_data("%s ",
559 TELOPT(i));
560 else if (TELCMD_OK(i))
561 output_data("%s ",
562 TELCMD(i));
563 else
564 output_data("%d ",
565 i);
566 if (TELOPT_OK(j))
567 output_data("%s",
568 TELOPT(j));
569 else if (TELCMD_OK(j))
570 output_data("%s",
571 TELCMD(j));
572 else
573 output_data("%d",
574 j);
575 output_data(", not IAC SE!) ");
576 }
577 }
578 length -= 2;
579 }
580 if (length < 1) {
581 output_data("(Empty suboption??\?)");
582 return;
583 }
584 switch (pointer[0]) {
585 case TELOPT_TTYPE:
586 output_data("TERMINAL-TYPE ");
587 switch (pointer[1]) {
588 case TELQUAL_IS:
589 output_data("IS \"%.*s\"",
590 (int)(length-2),
591 (char *)pointer+2);
592 break;
593 case TELQUAL_SEND:
594 output_data("SEND");
595 break;
596 default:
597 output_data("- unknown qualifier %d (0x%x).",
598 pointer[1], pointer[1]);
599 }
600 break;
601 case TELOPT_TSPEED:
602 output_data("TERMINAL-SPEED");
603 if (length < 2) {
604 output_data(" (empty suboption??\?)");
605 break;
606 }
607 switch (pointer[1]) {
608 case TELQUAL_IS:
609 output_data(" IS %.*s", (int)(length-2), (char *)pointer+2);
610 break;
611 default:
612 if (pointer[1] == 1)
613 output_data(" SEND");
614 else
615 output_data(" %d (unknown)", pointer[1]);
616 for (i = 2; i < length; i++) {
617 output_data(" ?%d?", pointer[i]);
618 }
619 break;
620 }
621 break;
622
623 case TELOPT_LFLOW:
624 output_data("TOGGLE-FLOW-CONTROL");
625 if (length < 2) {
626 output_data(" (empty suboption??\?)");
627 break;
628 }
629 switch (pointer[1]) {
630 case LFLOW_OFF:
631 output_data(" OFF");
632 break;
633 case LFLOW_ON:
634 output_data(" ON");
635 break;
636 case LFLOW_RESTART_ANY:
637 output_data(" RESTART-ANY");
638 break;
639 case LFLOW_RESTART_XON:
640 output_data(" RESTART-XON");
641 break;
642 default:
643 output_data(" %d (unknown)",
644 pointer[1]);
645 }
646 for (i = 2; i < length; i++) {
647 output_data(" ?%d?",
648 pointer[i]);
649 }
650 break;
651
652 case TELOPT_NAWS:
653 output_data("NAWS");
654 if (length < 2) {
655 output_data(" (empty suboption??\?)");
656 break;
657 }
658 if (length == 2) {
659 output_data(" ?%d?",
660 pointer[1]);
661 break;
662 }
663 output_data(" %u %u(%u)",
664 pointer[1],
665 pointer[2],
666 (((unsigned int)pointer[1])<<8) + pointer[2]);
667 if (length == 4) {
668 output_data(" ?%d?",
669 pointer[3]);
670 break;
671 }
672 output_data(" %u %u(%u)",
673 pointer[3],
674 pointer[4],
675 (((unsigned int)pointer[3])<<8) + pointer[4]);
676 for (i = 5; i < length; i++) {
677 output_data(" ?%d?",
678 pointer[i]);
679 }
680 break;
681
682 case TELOPT_LINEMODE:
683 output_data("LINEMODE ");
684 if (length < 2) {
685 output_data(" (empty suboption??\?)");
686 break;
687 }
688 switch (pointer[1]) {
689 case WILL:
690 output_data("WILL ");
691 goto common;
692 case WONT:
693 output_data("WONT ");
694 goto common;
695 case DO:
696 output_data("DO ");
697 goto common;
698 case DONT:
699 output_data("DONT ");
700 common:
701 if (length < 3) {
702 output_data("(no option??\?)");
703 break;
704 }
705 switch (pointer[2]) {
706 case LM_FORWARDMASK:
707 output_data("Forward Mask");
708 for (i = 3; i < length; i++) {
709 output_data(" %x", pointer[i]);
710 }
711 break;
712 default:
713 output_data("%d (unknown)",
714 pointer[2]);
715 for (i = 3; i < length; i++) {
716 output_data(" %d",
717 pointer[i]);
718 }
719 break;
720 }
721 break;
722
723 case LM_SLC:
724 output_data("SLC");
725 for (i = 2; i < length - 2; i += 3) {
726 if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
727 output_data(" %s",
728 SLC_NAME(pointer[i+SLC_FUNC]));
729 else
730 output_data(" %d",
731 pointer[i+SLC_FUNC]);
732 switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
733 case SLC_NOSUPPORT:
734 output_data(" NOSUPPORT");
735 break;
736 case SLC_CANTCHANGE:
737 output_data(" CANTCHANGE");
738 break;
739 case SLC_VARIABLE:
740 output_data(" VARIABLE");
741 break;
742 case SLC_DEFAULT:
743 output_data(" DEFAULT");
744 break;
745 }
746 output_data("%s%s%s",
747 pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
748 pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
749 pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
750 if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
751 SLC_FLUSHOUT| SLC_LEVELBITS)) {
752 output_data("(0x%x)",
753 pointer[i+SLC_FLAGS]);
754 }
755 output_data(" %d;",
756 pointer[i+SLC_VALUE]);
757 if ((pointer[i+SLC_VALUE] == IAC) &&
758 (pointer[i+SLC_VALUE+1] == IAC))
759 i++;
760 }
761 for (; i < length; i++) {
762 output_data(" ?%d?",
763 pointer[i]);
764 }
765 break;
766
767 case LM_MODE:
768 output_data("MODE ");
769 if (length < 3) {
770 output_data("(no mode??\?)");
771 break;
772 }
773 {
774 char tbuf[32];
775 snprintf(tbuf,
776 sizeof(tbuf),
777 "%s%s%s%s%s",
778 pointer[2]&MODE_EDIT ? "|EDIT" : "",
779 pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
780 pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
781 pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
782 pointer[2]&MODE_ACK ? "|ACK" : "");
783 output_data("%s",
784 tbuf[1] ? &tbuf[1] : "0");
785 }
786 if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
787 output_data(" (0x%x)",
788 pointer[2]);
789 }
790 for (i = 3; i < length; i++) {
791 output_data(" ?0x%x?",
792 pointer[i]);
793 }
794 break;
795 default:
796 output_data("%d (unknown)",
797 pointer[1]);
798 for (i = 2; i < length; i++) {
799 output_data(" %d", pointer[i]);
800 }
801 }
802 break;
803
804 case TELOPT_STATUS: {
805 char *cp;
806 int j, k;
807
808 output_data("STATUS");
809
810 switch (pointer[1]) {
811 default:
812 if (pointer[1] == TELQUAL_SEND)
813 output_data(" SEND");
814 else
815 output_data(" %d (unknown)",
816 pointer[1]);
817 for (i = 2; i < length; i++) {
818 output_data(" ?%d?",
819 pointer[i]);
820 }
821 break;
822 case TELQUAL_IS:
823 output_data(" IS\r\n");
824
825 for (i = 2; i < length; i++) {
826 switch(pointer[i]) {
827 case DO: cp = "DO"; goto common2;
828 case DONT: cp = "DONT"; goto common2;
829 case WILL: cp = "WILL"; goto common2;
830 case WONT: cp = "WONT"; goto common2;
831 common2:
832 i++;
833 if (TELOPT_OK(pointer[i]))
834 output_data(" %s %s",
835 cp,
836 TELOPT(pointer[i]));
837 else
838 output_data(" %s %d",
839 cp,
840 pointer[i]);
841
842 output_data("\r\n");
843 break;
844
845 case SB:
846 output_data(" SB ");
847 i++;
848 j = k = i;
849 while (j < length) {
850 if (pointer[j] == SE) {
851 if (j+1 == length)
852 break;
853 if (pointer[j+1] == SE)
854 j++;
855 else
856 break;
857 }
858 pointer[k++] = pointer[j++];
859 }
860 printsub(0, &pointer[i], k - i);
861 if (i < length) {
862 output_data(" SE");
863 i = j;
864 } else
865 i = j - 1;
866
867 output_data("\r\n");
868
869 break;
870
871 default:
872 output_data(" %d",
873 pointer[i]);
874 break;
875 }
876 }
877 break;
878 }
879 break;
880 }
881
882 case TELOPT_XDISPLOC:
883 output_data("X-DISPLAY-LOCATION ");
884 switch (pointer[1]) {
885 case TELQUAL_IS:
886 output_data("IS \"%.*s\"",
887 (int)(length-2),
888 (char *)pointer+2);
889 break;
890 case TELQUAL_SEND:
891 output_data("SEND");
892 break;
893 default:
894 output_data("- unknown qualifier %d (0x%x).",
895 pointer[1], pointer[1]);
896 }
897 break;
898
899 case TELOPT_NEW_ENVIRON:
900 output_data("NEW-ENVIRON ");
901 goto env_common1;
902 case TELOPT_OLD_ENVIRON:
903 output_data("OLD-ENVIRON");
904 env_common1:
905 switch (pointer[1]) {
906 case TELQUAL_IS:
907 output_data("IS ");
908 goto env_common;
909 case TELQUAL_SEND:
910 output_data("SEND ");
911 goto env_common;
912 case TELQUAL_INFO:
913 output_data("INFO ");
914 env_common:
915 {
916 int quote = 0;
917 for (i = 2; i < length; i++ ) {
918 switch (pointer[i]) {
919 case NEW_ENV_VAR:
920 if (quote)
921 output_data("\" ");
922 output_data("VAR ");
923 quote = 0;
924 break;
925
926 case NEW_ENV_VALUE:
927 if (quote)
928 output_data("\" ");
929 output_data("VALUE ");
930 quote = 0;
931 break;
932
933 case ENV_ESC:
934 if (quote)
935 output_data("\" ");
936 output_data("ESC ");
937 quote = 0;
938 break;
939
940 case ENV_USERVAR:
941 if (quote)
942 output_data("\" ");
943 output_data("USERVAR ");
944 quote = 0;
945 break;
946
947 default:
948 if (isprint(pointer[i]) && pointer[i] != '"') {
949 if (!quote) {
950 output_data("\"");
951 quote = 1;
952 }
953 output_data("%c", pointer[i]);
954 } else {
955 output_data("%03o ", pointer[i]);
956 quote = 0;
957 }
958 break;
959 }
960 }
961 if (quote)
962 output_data("\"");
963 break;
964 }
965 }
966 break;
967
968 #ifdef AUTHENTICATION
969 case TELOPT_AUTHENTICATION:
970 output_data("AUTHENTICATION");
971
972 if (length < 2) {
973 output_data(" (empty suboption??\?)");
974 break;
975 }
976 switch (pointer[1]) {
977 case TELQUAL_REPLY:
978 case TELQUAL_IS:
979 output_data(" %s ",
980 (pointer[1] == TELQUAL_IS) ?
981 "IS" : "REPLY");
982 if (AUTHTYPE_NAME_OK(pointer[2]))
983 output_data("%s ",
984 AUTHTYPE_NAME(pointer[2]));
985 else
986 output_data("%d ",
987 pointer[2]);
988 if (length < 3) {
989 output_data("(partial suboption??\?)");
990 break;
991 }
992 output_data("%s|%s",
993 ((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
994 "CLIENT" : "SERVER",
995 ((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
996 "MUTUAL" : "ONE-WAY");
997
998 auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
999 output_data("%s",
1000 buf);
1001 break;
1002
1003 case TELQUAL_SEND:
1004 i = 2;
1005 output_data(" SEND ");
1006 while (i < length) {
1007 if (AUTHTYPE_NAME_OK(pointer[i]))
1008 output_data("%s ",
1009 AUTHTYPE_NAME(pointer[i]));
1010 else
1011 output_data("%d ",
1012 pointer[i]);
1013 if (++i >= length) {
1014 output_data("(partial suboption??\?)");
1015 break;
1016 }
1017 output_data("%s|%s ",
1018 ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
1019 "CLIENT" : "SERVER",
1020 ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
1021 "MUTUAL" : "ONE-WAY");
1022 ++i;
1023 }
1024 break;
1025
1026 case TELQUAL_NAME:
1027 i = 2;
1028 output_data(" NAME \"%.*s\"",
1029 (int)(length - 2),
1030 pointer);
1031 break;
1032
1033 default:
1034 for (i = 2; i < length; i++) {
1035 output_data(" ?%d?",
1036 pointer[i]);
1037 }
1038 break;
1039 }
1040 break;
1041 #endif
1042
1043 #ifdef ENCRYPTION
1044 case TELOPT_ENCRYPT:
1045 output_data("ENCRYPT");
1046 if (length < 2) {
1047 output_data(" (empty suboption?)");
1048 break;
1049 }
1050 switch (pointer[1]) {
1051 case ENCRYPT_START:
1052 output_data(" START");
1053 break;
1054
1055 case ENCRYPT_END:
1056 output_data(" END");
1057 break;
1058
1059 case ENCRYPT_REQSTART:
1060 output_data(" REQUEST-START");
1061 break;
1062
1063 case ENCRYPT_REQEND:
1064 output_data(" REQUEST-END");
1065 break;
1066
1067 case ENCRYPT_IS:
1068 case ENCRYPT_REPLY:
1069 output_data(" %s ",
1070 (pointer[1] == ENCRYPT_IS) ?
1071 "IS" : "REPLY");
1072 if (length < 3) {
1073 output_data(" (partial suboption?)");
1074 break;
1075 }
1076 if (ENCTYPE_NAME_OK(pointer[2]))
1077 output_data("%s ",
1078 ENCTYPE_NAME(pointer[2]));
1079 else
1080 output_data(" %d (unknown)",
1081 pointer[2]);
1082
1083 encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
1084 output_data("%s",
1085 buf);
1086 break;
1087
1088 case ENCRYPT_SUPPORT:
1089 i = 2;
1090 output_data(" SUPPORT ");
1091 while (i < length) {
1092 if (ENCTYPE_NAME_OK(pointer[i]))
1093 output_data("%s ",
1094 ENCTYPE_NAME(pointer[i]));
1095 else
1096 output_data("%d ",
1097 pointer[i]);
1098 i++;
1099 }
1100 break;
1101
1102 case ENCRYPT_ENC_KEYID:
1103 output_data(" ENC_KEYID %d", pointer[1]);
1104 goto encommon;
1105
1106 case ENCRYPT_DEC_KEYID:
1107 output_data(" DEC_KEYID %d", pointer[1]);
1108 goto encommon;
1109
1110 default:
1111 output_data(" %d (unknown)", pointer[1]);
1112 encommon:
1113 for (i = 2; i < length; i++) {
1114 output_data(" %d", pointer[i]);
1115 }
1116 break;
1117 }
1118 break;
1119 #endif
1120
1121 default:
1122 if (TELOPT_OK(pointer[0]))
1123 output_data("%s (unknown)",
1124 TELOPT(pointer[0]));
1125 else
1126 output_data("%d (unknown)",
1127 pointer[i]);
1128 for (i = 1; i < length; i++) {
1129 output_data(" %d", pointer[i]);
1130 }
1131 break;
1132 }
1133 output_data("\r\n");
1134 }
1135
1136 /*
1137 * Dump a data buffer in hex and ascii to the output data stream.
1138 */
1139 void
printdata(char * tag,char * ptr,size_t cnt)1140 printdata(char *tag, char *ptr, size_t cnt)
1141 {
1142 size_t i;
1143 char xbuf[30];
1144
1145 while (cnt) {
1146 /* flush net output buffer if no room for new data) */
1147 if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
1148 netflush();
1149 }
1150
1151 /* add a line of output */
1152 output_data("%s: ", tag);
1153 for (i = 0; i < 20 && cnt; i++) {
1154 output_data("%02x", *ptr);
1155 if (isprint((unsigned char)*ptr)) {
1156 xbuf[i] = *ptr;
1157 } else {
1158 xbuf[i] = '.';
1159 }
1160 if (i % 2) {
1161 output_data(" ");
1162 }
1163 cnt--;
1164 ptr++;
1165 }
1166 xbuf[i] = '\0';
1167 output_data(" %s\r\n", xbuf);
1168 }
1169 }
1170 #endif /* DIAGNOSTICS */
1171