utility.c revision 72445 
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
37RCSID("$Id: utility.c,v 1.23 2000/10/08 13:34:27 assar Exp $");
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
54int
55ttloop(void)
56{
57    void netflush(void);
58
59    DIAG(TD_REPORT, {
60	output_data("td: ttloop\r\n");
61    });
62    if (nfrontp-nbackp)
63	netflush();
64    ncc = read(net, netibuf, sizeof netibuf);
65    if (ncc < 0) {
66	if (errno == EINTR)
67	    return 1;
68	syslog(LOG_INFO, "ttloop:  read: %m\n");
69	exit(1);
70    } else if (ncc == 0) {
71	syslog(LOG_INFO, "ttloop:  peer died\n");
72	exit(1);
73    }
74    DIAG(TD_REPORT, {
75	output_data("td: ttloop read %d chars\r\n", ncc);
76    });
77    netip = netibuf;
78    telrcv();			/* state machine */
79    if (ncc > 0) {
80	pfrontp = pbackp = ptyobuf;
81	telrcv();
82    }
83    return 0;
84}  /* end of ttloop */
85
86/*
87 * Check a descriptor to see if out of band data exists on it.
88 */
89int
90stilloob(int s)
91{
92    static struct timeval timeout = { 0 };
93    fd_set	excepts;
94    int value;
95
96    if (s >= FD_SETSIZE)
97	fatal(ourpty, "fd too large");
98
99    do {
100	FD_ZERO(&excepts);
101	FD_SET(s, &excepts);
102	value = select(s+1, 0, 0, &excepts, &timeout);
103    } while ((value == -1) && (errno == EINTR));
104
105    if (value < 0) {
106	fatalperror(ourpty, "select");
107    }
108    if (FD_ISSET(s, &excepts)) {
109	return 1;
110    } else {
111	return 0;
112    }
113}
114
115void
116ptyflush(void)
117{
118    int n;
119
120    if ((n = pfrontp - pbackp) > 0) {
121	DIAG((TD_REPORT | TD_PTYDATA), {
122	    output_data("td: ptyflush %d chars\r\n", n);
123	});
124	DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
125	n = write(ourpty, pbackp, n);
126    }
127    if (n < 0) {
128	if (errno == EWOULDBLOCK || errno == EINTR)
129	    return;
130	cleanup(0);
131    }
132    pbackp += n;
133    if (pbackp == pfrontp)
134	pbackp = pfrontp = ptyobuf;
135}
136
137/*
138 * nextitem()
139 *
140 *	Return the address of the next "item" in the TELNET data
141 * stream.  This will be the address of the next character if
142 * the current address is a user data character, or it will
143 * be the address of the character following the TELNET command
144 * if the current address is a TELNET IAC ("I Am a Command")
145 * character.
146 */
147char *
148nextitem(char *current)
149{
150    if ((*current&0xff) != IAC) {
151	return current+1;
152    }
153    switch (*(current+1)&0xff) {
154    case DO:
155    case DONT:
156    case WILL:
157    case WONT:
158	return current+3;
159    case SB:{
160	/* loop forever looking for the SE */
161	char *look = current+2;
162
163	for (;;) {
164	    if ((*look++&0xff) == IAC) {
165		if ((*look++&0xff) == SE) {
166		    return look;
167		}
168	    }
169	}
170    }
171    default:
172	return current+2;
173    }
174}
175
176
177/*
178 * netclear()
179 *
180 *	We are about to do a TELNET SYNCH operation.  Clear
181 * the path to the network.
182 *
183 *	Things are a bit tricky since we may have sent the first
184 * byte or so of a previous TELNET command into the network.
185 * So, we have to scan the network buffer from the beginning
186 * until we are up to where we want to be.
187 *
188 *	A side effect of what we do, just to keep things
189 * simple, is to clear the urgent data pointer.  The principal
190 * caller should be setting the urgent data pointer AFTER calling
191 * us in any case.
192 */
193void
194netclear(void)
195{
196    char *thisitem, *next;
197    char *good;
198#define	wewant(p)	((nfrontp > p) && ((*p&0xff) == IAC) && \
199			 ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
200
201#ifdef ENCRYPTION
202	thisitem = nclearto > netobuf ? nclearto : netobuf;
203#else
204	thisitem = netobuf;
205#endif
206
207	while ((next = nextitem(thisitem)) <= nbackp) {
208	    thisitem = next;
209	}
210
211	/* Now, thisitem is first before/at boundary. */
212
213#ifdef ENCRYPTION
214	good = nclearto > netobuf ? nclearto : netobuf;
215#else
216	good = netobuf;	/* where the good bytes go */
217#endif
218
219	while (nfrontp > thisitem) {
220	    if (wewant(thisitem)) {
221		int length;
222
223		next = thisitem;
224		do {
225		    next = nextitem(next);
226		} while (wewant(next) && (nfrontp > next));
227		length = next-thisitem;
228		memmove(good, thisitem, length);
229		good += length;
230		thisitem = next;
231	    } else {
232		thisitem = nextitem(thisitem);
233	    }
234	}
235
236	nbackp = netobuf;
237	nfrontp = good;		/* next byte to be sent */
238	neturg = 0;
239}  /* end of netclear */
240
241/*
242 *  netflush
243 *		Send as much data as possible to the network,
244 *	handling requests for urgent data.
245 */
246void
247netflush(void)
248{
249    int n;
250    extern int not42;
251
252    if ((n = nfrontp - nbackp) > 0) {
253	DIAG(TD_REPORT,
254	     { n += output_data("td: netflush %d chars\r\n", n);
255	     });
256#ifdef ENCRYPTION
257	if (encrypt_output) {
258	    char *s = nclearto ? nclearto : nbackp;
259	    if (nfrontp - s > 0) {
260		(*encrypt_output)((unsigned char *)s, nfrontp-s);
261		nclearto = nfrontp;
262	    }
263	}
264#endif
265	/*
266	 * if no urgent data, or if the other side appears to be an
267	 * old 4.2 client (and thus unable to survive TCP urgent data),
268	 * write the entire buffer in non-OOB mode.
269	 */
270#if 1 /* remove this to make it work between solaris 2.6 and linux */
271	if ((neturg == 0) || (not42 == 0)) {
272#endif
273	    n = write(net, nbackp, n);	/* normal write */
274#if 1 /* remove this to make it work between solaris 2.6 and linux */
275	} else {
276	    n = neturg - nbackp;
277	    /*
278	     * In 4.2 (and 4.3) systems, there is some question about
279	     * what byte in a sendOOB operation is the "OOB" data.
280	     * To make ourselves compatible, we only send ONE byte
281	     * out of band, the one WE THINK should be OOB (though
282	     * we really have more the TCP philosophy of urgent data
283	     * rather than the Unix philosophy of OOB data).
284	     */
285	    if (n > 1) {
286		n = send(net, nbackp, n-1, 0);	/* send URGENT all by itself */
287	    } else {
288		n = send(net, nbackp, n, MSG_OOB);	/* URGENT data */
289	    }
290	}
291#endif
292    }
293    if (n < 0) {
294	if (errno == EWOULDBLOCK || errno == EINTR)
295	    return;
296	cleanup(0);
297    }
298    nbackp += n;
299#ifdef ENCRYPTION
300    if (nbackp > nclearto)
301	nclearto = 0;
302#endif
303    if (nbackp >= neturg) {
304	neturg = 0;
305    }
306    if (nbackp == nfrontp) {
307	nbackp = nfrontp = netobuf;
308#ifdef ENCRYPTION
309	nclearto = 0;
310#endif
311    }
312    return;
313}
314
315
316/*
317 * writenet
318 *
319 * Just a handy little function to write a bit of raw data to the net.
320 * It will force a transmit of the buffer if necessary
321 *
322 * arguments
323 *    ptr - A pointer to a character string to write
324 *    len - How many bytes to write
325 */
326void
327writenet(unsigned char *ptr, int len)
328{
329    /* flush buffer if no room for new data) */
330    while ((&netobuf[BUFSIZ] - nfrontp) < len) {
331	/* if this fails, don't worry, buffer is a little big */
332	netflush();
333    }
334
335    memmove(nfrontp, ptr, len);
336    nfrontp += len;
337}
338
339
340/*
341 * miscellaneous functions doing a variety of little jobs follow ...
342 */
343
344
345void fatal(int f, char *msg)
346{
347    char buf[BUFSIZ];
348
349    snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
350#ifdef ENCRYPTION
351    if (encrypt_output) {
352	/*
353	 * Better turn off encryption first....
354	 * Hope it flushes...
355	 */
356	encrypt_send_end();
357	netflush();
358    }
359#endif
360    write(f, buf, (int)strlen(buf));
361    sleep(1);	/*XXX*/
362    exit(1);
363}
364
365void
366fatalperror(int f, const char *msg)
367{
368    char buf[BUFSIZ];
369
370    snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(errno));
371    fatal(f, buf);
372}
373
374char editedhost[32];
375
376void edithost(char *pat, char *host)
377{
378    char *res = editedhost;
379
380    if (!pat)
381	pat = "";
382    while (*pat) {
383	switch (*pat) {
384
385	case '#':
386	    if (*host)
387		host++;
388	    break;
389
390	case '@':
391	    if (*host)
392		*res++ = *host++;
393	    break;
394
395	default:
396	    *res++ = *pat;
397	    break;
398	}
399	if (res == &editedhost[sizeof editedhost - 1]) {
400	    *res = '\0';
401	    return;
402	}
403	pat++;
404    }
405    if (*host)
406	strlcpy (res, host,
407			 sizeof editedhost - (res - editedhost));
408    else
409	*res = '\0';
410    editedhost[sizeof editedhost - 1] = '\0';
411}
412
413static char *putlocation;
414
415void
416putstr(char *s)
417{
418
419    while (*s)
420	putchr(*s++);
421}
422
423void
424putchr(int cc)
425{
426    *putlocation++ = cc;
427}
428
429/*
430 * This is split on two lines so that SCCS will not see the M
431 * between two % signs and expand it...
432 */
433static char fmtstr[] = { "%l:%M" "%P on %A, %d %B %Y" };
434
435void putf(char *cp, char *where)
436{
437#ifdef HAVE_UNAME
438    struct utsname name;
439#endif
440    char *slash;
441    time_t t;
442    char db[100];
443
444    /* if we don't have uname, set these to sensible values */
445    char *sysname = "Unix",
446	*machine = "",
447	*release = "",
448	*version = "";
449
450#ifdef HAVE_UNAME
451    uname(&name);
452    sysname=name.sysname;
453    machine=name.machine;
454    release=name.release;
455    version=name.version;
456#endif
457
458    putlocation = where;
459
460    while (*cp) {
461	if (*cp != '%') {
462	    putchr(*cp++);
463	    continue;
464	}
465	switch (*++cp) {
466
467	case 't':
468#ifdef	STREAMSPTY
469	    /* names are like /dev/pts/2 -- we want pts/2 */
470	    slash = strchr(line+1, '/');
471#else
472	    slash = strrchr(line, '/');
473#endif
474	    if (slash == (char *) 0)
475		putstr(line);
476	    else
477		putstr(&slash[1]);
478	    break;
479
480	case 'h':
481	    putstr(editedhost);
482	    break;
483
484	case 's':
485	    putstr(sysname);
486	    break;
487
488	case 'm':
489	    putstr(machine);
490	    break;
491
492	case 'r':
493	    putstr(release);
494	    break;
495
496	case 'v':
497	    putstr(version);
498	    break;
499
500	case 'd':
501	    time(&t);
502	    strftime(db, sizeof(db), fmtstr, localtime(&t));
503	    putstr(db);
504	    break;
505
506	case '%':
507	    putchr('%');
508	    break;
509	}
510	cp++;
511    }
512}
513
514#ifdef DIAGNOSTICS
515/*
516 * Print telnet options and commands in plain text, if possible.
517 */
518void
519printoption(char *fmt, int option)
520{
521    if (TELOPT_OK(option))
522	output_data("%s %s\r\n",
523		    fmt,
524		    TELOPT(option));
525    else if (TELCMD_OK(option))
526	output_data("%s %s\r\n",
527		    fmt,
528		    TELCMD(option));
529    else
530	output_data("%s %d\r\n",
531		    fmt,
532		    option);
533    return;
534}
535
536void
537printsub(int direction, unsigned char *pointer, int length)
538        		          	/* '<' or '>' */
539                 	         	/* where suboption data sits */
540       			       		/* length of suboption data */
541{
542    int i = 0;
543    unsigned char buf[512];
544
545    if (!(diagnostic & TD_OPTIONS))
546	return;
547
548    if (direction) {
549	output_data("td: %s suboption ",
550		    direction == '<' ? "recv" : "send");
551	if (length >= 3) {
552	    int j;
553
554	    i = pointer[length-2];
555	    j = pointer[length-1];
556
557	    if (i != IAC || j != SE) {
558		output_data("(terminated by ");
559		if (TELOPT_OK(i))
560		    output_data("%s ",
561				TELOPT(i));
562		else if (TELCMD_OK(i))
563		    output_data("%s ",
564				TELCMD(i));
565		else
566		    output_data("%d ",
567				i);
568		if (TELOPT_OK(j))
569		    output_data("%s",
570				TELOPT(j));
571		else if (TELCMD_OK(j))
572		    output_data("%s",
573				TELCMD(j));
574		else
575		    output_data("%d",
576				j);
577		output_data(", not IAC SE!) ");
578	    }
579	}
580	length -= 2;
581    }
582    if (length < 1) {
583	output_data("(Empty suboption??\?)");
584	return;
585    }
586    switch (pointer[0]) {
587    case TELOPT_TTYPE:
588	output_data("TERMINAL-TYPE ");
589	switch (pointer[1]) {
590	case TELQUAL_IS:
591	    output_data("IS \"%.*s\"",
592			length-2,
593			(char *)pointer+2);
594	    break;
595	case TELQUAL_SEND:
596	    output_data("SEND");
597	    break;
598	default:
599	    output_data("- unknown qualifier %d (0x%x).",
600			pointer[1], pointer[1]);
601	}
602	break;
603    case TELOPT_TSPEED:
604	output_data("TERMINAL-SPEED");
605	if (length < 2) {
606	    output_data(" (empty suboption??\?)");
607	    break;
608	}
609	switch (pointer[1]) {
610	case TELQUAL_IS:
611	    output_data(" IS %.*s", length-2, (char *)pointer+2);
612	    break;
613	default:
614	    if (pointer[1] == 1)
615		output_data(" SEND");
616	    else
617		output_data(" %d (unknown)", pointer[1]);
618	    for (i = 2; i < length; i++) {
619		output_data(" ?%d?", pointer[i]);
620	    }
621	    break;
622	}
623	break;
624
625    case TELOPT_LFLOW:
626	output_data("TOGGLE-FLOW-CONTROL");
627	if (length < 2) {
628	    output_data(" (empty suboption??\?)");
629	    break;
630	}
631	switch (pointer[1]) {
632	case LFLOW_OFF:
633	    output_data(" OFF");
634	    break;
635	case LFLOW_ON:
636	    output_data(" ON");
637	    break;
638	case LFLOW_RESTART_ANY:
639	    output_data(" RESTART-ANY");
640	    break;
641	case LFLOW_RESTART_XON:
642	    output_data(" RESTART-XON");
643	    break;
644	default:
645	    output_data(" %d (unknown)",
646			pointer[1]);
647	}
648	for (i = 2; i < length; i++) {
649	    output_data(" ?%d?",
650			pointer[i]);
651	}
652	break;
653
654    case TELOPT_NAWS:
655	output_data("NAWS");
656	if (length < 2) {
657	    output_data(" (empty suboption??\?)");
658	    break;
659	}
660	if (length == 2) {
661	    output_data(" ?%d?",
662			pointer[1]);
663	    break;
664	}
665	output_data(" %u %u(%u)",
666		    pointer[1],
667		    pointer[2],
668		    (((unsigned int)pointer[1])<<8) + pointer[2]);
669	if (length == 4) {
670	    output_data(" ?%d?",
671			pointer[3]);
672	    break;
673	}
674	output_data(" %u %u(%u)",
675		    pointer[3],
676		    pointer[4],
677		    (((unsigned int)pointer[3])<<8) + pointer[4]);
678	for (i = 5; i < length; i++) {
679	    output_data(" ?%d?",
680			pointer[i]);
681	}
682	break;
683
684    case TELOPT_LINEMODE:
685	output_data("LINEMODE ");
686	if (length < 2) {
687	    output_data(" (empty suboption??\?)");
688	    break;
689	}
690	switch (pointer[1]) {
691	case WILL:
692	    output_data("WILL ");
693	    goto common;
694	case WONT:
695	    output_data("WONT ");
696	    goto common;
697	case DO:
698	    output_data("DO ");
699	    goto common;
700	case DONT:
701	    output_data("DONT ");
702	common:
703	    if (length < 3) {
704		output_data("(no option??\?)");
705		break;
706	    }
707	    switch (pointer[2]) {
708	    case LM_FORWARDMASK:
709		output_data("Forward Mask");
710		for (i = 3; i < length; i++) {
711		    output_data(" %x", pointer[i]);
712		}
713		break;
714	    default:
715		output_data("%d (unknown)",
716			    pointer[2]);
717		for (i = 3; i < length; i++) {
718		    output_data(" %d",
719				pointer[i]);
720		}
721		break;
722	    }
723	    break;
724
725	case LM_SLC:
726	    output_data("SLC");
727	    for (i = 2; i < length - 2; i += 3) {
728		if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
729		    output_data(" %s",
730				SLC_NAME(pointer[i+SLC_FUNC]));
731		else
732		    output_data(" %d",
733				pointer[i+SLC_FUNC]);
734		switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
735		case SLC_NOSUPPORT:
736		    output_data(" NOSUPPORT");
737		    break;
738		case SLC_CANTCHANGE:
739		    output_data(" CANTCHANGE");
740		    break;
741		case SLC_VARIABLE:
742		    output_data(" VARIABLE");
743		    break;
744		case SLC_DEFAULT:
745		    output_data(" DEFAULT");
746		    break;
747		}
748		output_data("%s%s%s",
749			    pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
750			    pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
751			    pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
752		if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
753					    SLC_FLUSHOUT| SLC_LEVELBITS)) {
754		    output_data("(0x%x)",
755				pointer[i+SLC_FLAGS]);
756		}
757		output_data(" %d;",
758			    pointer[i+SLC_VALUE]);
759		if ((pointer[i+SLC_VALUE] == IAC) &&
760		    (pointer[i+SLC_VALUE+1] == IAC))
761		    i++;
762	    }
763	    for (; i < length; i++) {
764		output_data(" ?%d?",
765			    pointer[i]);
766	    }
767	    break;
768
769	case LM_MODE:
770	    output_data("MODE ");
771	    if (length < 3) {
772		output_data("(no mode??\?)");
773		break;
774	    }
775	    {
776		char tbuf[32];
777		snprintf(tbuf,
778			 sizeof(tbuf),
779			 "%s%s%s%s%s",
780			 pointer[2]&MODE_EDIT ? "|EDIT" : "",
781			 pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
782			 pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
783			 pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
784			 pointer[2]&MODE_ACK ? "|ACK" : "");
785		output_data("%s",
786			    tbuf[1] ? &tbuf[1] : "0");
787	    }
788	    if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
789		output_data(" (0x%x)",
790			    pointer[2]);
791	    }
792	    for (i = 3; i < length; i++) {
793		output_data(" ?0x%x?",
794			 pointer[i]);
795	    }
796	    break;
797	default:
798	    output_data("%d (unknown)",
799			pointer[1]);
800	    for (i = 2; i < length; i++) {
801		output_data(" %d", pointer[i]);
802	    }
803	}
804	break;
805
806    case TELOPT_STATUS: {
807	char *cp;
808	int j, k;
809
810	output_data("STATUS");
811
812	switch (pointer[1]) {
813	default:
814	    if (pointer[1] == TELQUAL_SEND)
815		output_data(" SEND");
816	    else
817		output_data(" %d (unknown)",
818			    pointer[1]);
819	    for (i = 2; i < length; i++) {
820		output_data(" ?%d?",
821			    pointer[i]);
822	    }
823	    break;
824	case TELQUAL_IS:
825	    output_data(" IS\r\n");
826
827	    for (i = 2; i < length; i++) {
828		switch(pointer[i]) {
829		case DO:	cp = "DO"; goto common2;
830		case DONT:	cp = "DONT"; goto common2;
831		case WILL:	cp = "WILL"; goto common2;
832		case WONT:	cp = "WONT"; goto common2;
833		common2:
834		i++;
835		if (TELOPT_OK(pointer[i]))
836		    output_data(" %s %s",
837				cp,
838				TELOPT(pointer[i]));
839		else
840		    output_data(" %s %d",
841				cp,
842				pointer[i]);
843
844		output_data("\r\n");
845		break;
846
847		case SB:
848		    output_data(" SB ");
849		    i++;
850		    j = k = i;
851		    while (j < length) {
852			if (pointer[j] == SE) {
853			    if (j+1 == length)
854				break;
855			    if (pointer[j+1] == SE)
856				j++;
857			    else
858				break;
859			}
860			pointer[k++] = pointer[j++];
861		    }
862		    printsub(0, &pointer[i], k - i);
863		    if (i < length) {
864			output_data(" SE");
865			i = j;
866		    } else
867			i = j - 1;
868
869		    output_data("\r\n");
870
871		    break;
872
873		default:
874		    output_data(" %d",
875				pointer[i]);
876		    break;
877		}
878	    }
879	    break;
880	}
881	break;
882    }
883
884    case TELOPT_XDISPLOC:
885	output_data("X-DISPLAY-LOCATION ");
886	switch (pointer[1]) {
887	case TELQUAL_IS:
888	    output_data("IS \"%.*s\"",
889			length-2,
890			(char *)pointer+2);
891	    break;
892	case TELQUAL_SEND:
893	    output_data("SEND");
894	    break;
895	default:
896	    output_data("- unknown qualifier %d (0x%x).",
897			pointer[1], pointer[1]);
898	}
899	break;
900
901    case TELOPT_NEW_ENVIRON:
902	output_data("NEW-ENVIRON ");
903	goto env_common1;
904    case TELOPT_OLD_ENVIRON:
905	output_data("OLD-ENVIRON");
906    env_common1:
907	switch (pointer[1]) {
908	case TELQUAL_IS:
909	    output_data("IS ");
910	    goto env_common;
911	case TELQUAL_SEND:
912	    output_data("SEND ");
913	    goto env_common;
914	case TELQUAL_INFO:
915	    output_data("INFO ");
916	env_common:
917	    {
918		int noquote = 2;
919		for (i = 2; i < length; i++ ) {
920		    switch (pointer[i]) {
921		    case NEW_ENV_VAR:
922			output_data("\" VAR " + noquote);
923			noquote = 2;
924			break;
925
926		    case NEW_ENV_VALUE:
927			output_data("\" VALUE " + noquote);
928			noquote = 2;
929			break;
930
931		    case ENV_ESC:
932			output_data("\" ESC " + noquote);
933			noquote = 2;
934			break;
935
936		    case ENV_USERVAR:
937			output_data("\" USERVAR " + noquote);
938			noquote = 2;
939			break;
940
941		    default:
942			if (isprint(pointer[i]) && pointer[i] != '"') {
943			    if (noquote) {
944				output_data ("\"");
945				noquote = 0;
946			    }
947			    output_data ("%c", pointer[i]);
948			} else {
949			    output_data("\" %03o " + noquote,
950					pointer[i]);
951			    noquote = 2;
952			}
953			break;
954		    }
955		}
956		if (!noquote)
957		    output_data ("\"");
958		break;
959	    }
960	}
961	break;
962
963#ifdef AUTHENTICATION
964    case TELOPT_AUTHENTICATION:
965	output_data("AUTHENTICATION");
966
967	if (length < 2) {
968	    output_data(" (empty suboption??\?)");
969	    break;
970	}
971	switch (pointer[1]) {
972	case TELQUAL_REPLY:
973	case TELQUAL_IS:
974	    output_data(" %s ",
975			(pointer[1] == TELQUAL_IS) ?
976			"IS" : "REPLY");
977	    if (AUTHTYPE_NAME_OK(pointer[2]))
978		output_data("%s ",
979			    AUTHTYPE_NAME(pointer[2]));
980	    else
981		output_data("%d ",
982			    pointer[2]);
983	    if (length < 3) {
984		output_data("(partial suboption??\?)");
985		break;
986	    }
987	    output_data("%s|%s",
988			((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
989			"CLIENT" : "SERVER",
990			((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
991			"MUTUAL" : "ONE-WAY");
992
993	    auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
994	    output_data("%s",
995			buf);
996	    break;
997
998	case TELQUAL_SEND:
999	    i = 2;
1000	    output_data(" SEND ");
1001	    while (i < length) {
1002		if (AUTHTYPE_NAME_OK(pointer[i]))
1003		    output_data("%s ",
1004				AUTHTYPE_NAME(pointer[i]));
1005		else
1006		    output_data("%d ",
1007				pointer[i]);
1008		if (++i >= length) {
1009		    output_data("(partial suboption??\?)");
1010		    break;
1011		}
1012		output_data("%s|%s ",
1013			    ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
1014			    "CLIENT" : "SERVER",
1015			    ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
1016			    "MUTUAL" : "ONE-WAY");
1017		++i;
1018	    }
1019	    break;
1020
1021	case TELQUAL_NAME:
1022	    i = 2;
1023	    output_data(" NAME \"%.*s\"",
1024			length - 2,
1025			pointer);
1026	    break;
1027
1028	default:
1029	    for (i = 2; i < length; i++) {
1030		output_data(" ?%d?",
1031			    pointer[i]);
1032	    }
1033	    break;
1034	}
1035	break;
1036#endif
1037
1038#ifdef ENCRYPTION
1039    case TELOPT_ENCRYPT:
1040	output_data("ENCRYPT");
1041	if (length < 2) {
1042	    output_data(" (empty suboption?)");
1043	    break;
1044	}
1045	switch (pointer[1]) {
1046	case ENCRYPT_START:
1047	    output_data(" START");
1048	    break;
1049
1050	case ENCRYPT_END:
1051	    output_data(" END");
1052	    break;
1053
1054	case ENCRYPT_REQSTART:
1055	    output_data(" REQUEST-START");
1056	    break;
1057
1058	case ENCRYPT_REQEND:
1059	    output_data(" REQUEST-END");
1060	    break;
1061
1062	case ENCRYPT_IS:
1063	case ENCRYPT_REPLY:
1064	    output_data(" %s ",
1065			(pointer[1] == ENCRYPT_IS) ?
1066			"IS" : "REPLY");
1067	    if (length < 3) {
1068		output_data(" (partial suboption?)");
1069		break;
1070	    }
1071	    if (ENCTYPE_NAME_OK(pointer[2]))
1072		output_data("%s ",
1073			    ENCTYPE_NAME(pointer[2]));
1074	    else
1075		output_data(" %d (unknown)",
1076			    pointer[2]);
1077
1078	    encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
1079	    output_data("%s",
1080			buf);
1081	    break;
1082
1083	case ENCRYPT_SUPPORT:
1084	    i = 2;
1085	    output_data(" SUPPORT ");
1086	    while (i < length) {
1087		if (ENCTYPE_NAME_OK(pointer[i]))
1088		    output_data("%s ",
1089				ENCTYPE_NAME(pointer[i]));
1090		else
1091		    output_data("%d ",
1092				pointer[i]);
1093		i++;
1094	    }
1095	    break;
1096
1097	case ENCRYPT_ENC_KEYID:
1098	    output_data(" ENC_KEYID %d", pointer[1]);
1099	    goto encommon;
1100
1101	case ENCRYPT_DEC_KEYID:
1102	    output_data(" DEC_KEYID %d", pointer[1]);
1103	    goto encommon;
1104
1105	default:
1106	    output_data(" %d (unknown)", pointer[1]);
1107	encommon:
1108	    for (i = 2; i < length; i++) {
1109		output_data(" %d", pointer[i]);
1110	    }
1111	    break;
1112	}
1113	break;
1114#endif
1115
1116    default:
1117	if (TELOPT_OK(pointer[0]))
1118	    output_data("%s (unknown)",
1119			TELOPT(pointer[0]));
1120	else
1121	    output_data("%d (unknown)",
1122			pointer[i]);
1123	for (i = 1; i < length; i++) {
1124	    output_data(" %d", pointer[i]);
1125	}
1126	break;
1127    }
1128    output_data("\r\n");
1129}
1130
1131/*
1132 * Dump a data buffer in hex and ascii to the output data stream.
1133 */
1134void
1135printdata(char *tag, char *ptr, int cnt)
1136{
1137    int i;
1138    char xbuf[30];
1139
1140    while (cnt) {
1141	/* flush net output buffer if no room for new data) */
1142	if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
1143	    netflush();
1144	}
1145
1146	/* add a line of output */
1147	output_data("%s: ", tag);
1148	for (i = 0; i < 20 && cnt; i++) {
1149	    output_data("%02x", *ptr);
1150	    if (isprint(*ptr)) {
1151		xbuf[i] = *ptr;
1152	    } else {
1153		xbuf[i] = '.';
1154	    }
1155	    if (i % 2) {
1156		output_data(" ");
1157	    }
1158	    cnt--;
1159	    ptr++;
1160	}
1161	xbuf[i] = '\0';
1162	output_data(" %s\r\n", xbuf);
1163    }
1164}
1165#endif /* DIAGNOSTICS */
1166