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