utility.c revision 78527 
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 1.25 2001/05/17 00:34:42 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_errno(int f, const char *msg, int error)
367{
368    char buf[BUFSIZ];
369
370    snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(error));
371    fatal(f, buf);
372}
373
374void
375fatalperror(int f, const char *msg)
376{
377    fatalperror_errno(f, msg, errno);
378}
379
380char editedhost[32];
381
382void edithost(char *pat, char *host)
383{
384    char *res = editedhost;
385
386    if (!pat)
387	pat = "";
388    while (*pat) {
389	switch (*pat) {
390
391	case '#':
392	    if (*host)
393		host++;
394	    break;
395
396	case '@':
397	    if (*host)
398		*res++ = *host++;
399	    break;
400
401	default:
402	    *res++ = *pat;
403	    break;
404	}
405	if (res == &editedhost[sizeof editedhost - 1]) {
406	    *res = '\0';
407	    return;
408	}
409	pat++;
410    }
411    if (*host)
412	strlcpy (res, host,
413			 sizeof editedhost - (res - editedhost));
414    else
415	*res = '\0';
416    editedhost[sizeof editedhost - 1] = '\0';
417}
418
419static char *putlocation;
420
421void
422putstr(char *s)
423{
424
425    while (*s)
426	putchr(*s++);
427}
428
429void
430putchr(int cc)
431{
432    *putlocation++ = cc;
433}
434
435/*
436 * This is split on two lines so that SCCS will not see the M
437 * between two % signs and expand it...
438 */
439static char fmtstr[] = { "%l:%M" "%P on %A, %d %B %Y" };
440
441void putf(char *cp, char *where)
442{
443#ifdef HAVE_UNAME
444    struct utsname name;
445#endif
446    char *slash;
447    time_t t;
448    char db[100];
449
450    /* if we don't have uname, set these to sensible values */
451    char *sysname = "Unix",
452	*machine = "",
453	*release = "",
454	*version = "";
455
456#ifdef HAVE_UNAME
457    uname(&name);
458    sysname=name.sysname;
459    machine=name.machine;
460    release=name.release;
461    version=name.version;
462#endif
463
464    putlocation = where;
465
466    while (*cp) {
467	if (*cp != '%') {
468	    putchr(*cp++);
469	    continue;
470	}
471	switch (*++cp) {
472
473	case 't':
474#ifdef	STREAMSPTY
475	    /* names are like /dev/pts/2 -- we want pts/2 */
476	    slash = strchr(line+1, '/');
477#else
478	    slash = strrchr(line, '/');
479#endif
480	    if (slash == (char *) 0)
481		putstr(line);
482	    else
483		putstr(&slash[1]);
484	    break;
485
486	case 'h':
487	    putstr(editedhost);
488	    break;
489
490	case 's':
491	    putstr(sysname);
492	    break;
493
494	case 'm':
495	    putstr(machine);
496	    break;
497
498	case 'r':
499	    putstr(release);
500	    break;
501
502	case 'v':
503	    putstr(version);
504	    break;
505
506	case 'd':
507	    time(&t);
508	    strftime(db, sizeof(db), fmtstr, localtime(&t));
509	    putstr(db);
510	    break;
511
512	case '%':
513	    putchr('%');
514	    break;
515	}
516	cp++;
517    }
518}
519
520#ifdef DIAGNOSTICS
521/*
522 * Print telnet options and commands in plain text, if possible.
523 */
524void
525printoption(char *fmt, int option)
526{
527    if (TELOPT_OK(option))
528	output_data("%s %s\r\n",
529		    fmt,
530		    TELOPT(option));
531    else if (TELCMD_OK(option))
532	output_data("%s %s\r\n",
533		    fmt,
534		    TELCMD(option));
535    else
536	output_data("%s %d\r\n",
537		    fmt,
538		    option);
539    return;
540}
541
542void
543printsub(int direction, unsigned char *pointer, int length)
544        		          	/* '<' or '>' */
545                 	         	/* where suboption data sits */
546       			       		/* length of suboption data */
547{
548    int i = 0;
549    unsigned char buf[512];
550
551    if (!(diagnostic & TD_OPTIONS))
552	return;
553
554    if (direction) {
555	output_data("td: %s suboption ",
556		    direction == '<' ? "recv" : "send");
557	if (length >= 3) {
558	    int j;
559
560	    i = pointer[length-2];
561	    j = pointer[length-1];
562
563	    if (i != IAC || j != SE) {
564		output_data("(terminated by ");
565		if (TELOPT_OK(i))
566		    output_data("%s ",
567				TELOPT(i));
568		else if (TELCMD_OK(i))
569		    output_data("%s ",
570				TELCMD(i));
571		else
572		    output_data("%d ",
573				i);
574		if (TELOPT_OK(j))
575		    output_data("%s",
576				TELOPT(j));
577		else if (TELCMD_OK(j))
578		    output_data("%s",
579				TELCMD(j));
580		else
581		    output_data("%d",
582				j);
583		output_data(", not IAC SE!) ");
584	    }
585	}
586	length -= 2;
587    }
588    if (length < 1) {
589	output_data("(Empty suboption??\?)");
590	return;
591    }
592    switch (pointer[0]) {
593    case TELOPT_TTYPE:
594	output_data("TERMINAL-TYPE ");
595	switch (pointer[1]) {
596	case TELQUAL_IS:
597	    output_data("IS \"%.*s\"",
598			length-2,
599			(char *)pointer+2);
600	    break;
601	case TELQUAL_SEND:
602	    output_data("SEND");
603	    break;
604	default:
605	    output_data("- unknown qualifier %d (0x%x).",
606			pointer[1], pointer[1]);
607	}
608	break;
609    case TELOPT_TSPEED:
610	output_data("TERMINAL-SPEED");
611	if (length < 2) {
612	    output_data(" (empty suboption??\?)");
613	    break;
614	}
615	switch (pointer[1]) {
616	case TELQUAL_IS:
617	    output_data(" IS %.*s", length-2, (char *)pointer+2);
618	    break;
619	default:
620	    if (pointer[1] == 1)
621		output_data(" SEND");
622	    else
623		output_data(" %d (unknown)", pointer[1]);
624	    for (i = 2; i < length; i++) {
625		output_data(" ?%d?", pointer[i]);
626	    }
627	    break;
628	}
629	break;
630
631    case TELOPT_LFLOW:
632	output_data("TOGGLE-FLOW-CONTROL");
633	if (length < 2) {
634	    output_data(" (empty suboption??\?)");
635	    break;
636	}
637	switch (pointer[1]) {
638	case LFLOW_OFF:
639	    output_data(" OFF");
640	    break;
641	case LFLOW_ON:
642	    output_data(" ON");
643	    break;
644	case LFLOW_RESTART_ANY:
645	    output_data(" RESTART-ANY");
646	    break;
647	case LFLOW_RESTART_XON:
648	    output_data(" RESTART-XON");
649	    break;
650	default:
651	    output_data(" %d (unknown)",
652			pointer[1]);
653	}
654	for (i = 2; i < length; i++) {
655	    output_data(" ?%d?",
656			pointer[i]);
657	}
658	break;
659
660    case TELOPT_NAWS:
661	output_data("NAWS");
662	if (length < 2) {
663	    output_data(" (empty suboption??\?)");
664	    break;
665	}
666	if (length == 2) {
667	    output_data(" ?%d?",
668			pointer[1]);
669	    break;
670	}
671	output_data(" %u %u(%u)",
672		    pointer[1],
673		    pointer[2],
674		    (((unsigned int)pointer[1])<<8) + pointer[2]);
675	if (length == 4) {
676	    output_data(" ?%d?",
677			pointer[3]);
678	    break;
679	}
680	output_data(" %u %u(%u)",
681		    pointer[3],
682		    pointer[4],
683		    (((unsigned int)pointer[3])<<8) + pointer[4]);
684	for (i = 5; i < length; i++) {
685	    output_data(" ?%d?",
686			pointer[i]);
687	}
688	break;
689
690    case TELOPT_LINEMODE:
691	output_data("LINEMODE ");
692	if (length < 2) {
693	    output_data(" (empty suboption??\?)");
694	    break;
695	}
696	switch (pointer[1]) {
697	case WILL:
698	    output_data("WILL ");
699	    goto common;
700	case WONT:
701	    output_data("WONT ");
702	    goto common;
703	case DO:
704	    output_data("DO ");
705	    goto common;
706	case DONT:
707	    output_data("DONT ");
708	common:
709	    if (length < 3) {
710		output_data("(no option??\?)");
711		break;
712	    }
713	    switch (pointer[2]) {
714	    case LM_FORWARDMASK:
715		output_data("Forward Mask");
716		for (i = 3; i < length; i++) {
717		    output_data(" %x", pointer[i]);
718		}
719		break;
720	    default:
721		output_data("%d (unknown)",
722			    pointer[2]);
723		for (i = 3; i < length; i++) {
724		    output_data(" %d",
725				pointer[i]);
726		}
727		break;
728	    }
729	    break;
730
731	case LM_SLC:
732	    output_data("SLC");
733	    for (i = 2; i < length - 2; i += 3) {
734		if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
735		    output_data(" %s",
736				SLC_NAME(pointer[i+SLC_FUNC]));
737		else
738		    output_data(" %d",
739				pointer[i+SLC_FUNC]);
740		switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
741		case SLC_NOSUPPORT:
742		    output_data(" NOSUPPORT");
743		    break;
744		case SLC_CANTCHANGE:
745		    output_data(" CANTCHANGE");
746		    break;
747		case SLC_VARIABLE:
748		    output_data(" VARIABLE");
749		    break;
750		case SLC_DEFAULT:
751		    output_data(" DEFAULT");
752		    break;
753		}
754		output_data("%s%s%s",
755			    pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
756			    pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
757			    pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
758		if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
759					    SLC_FLUSHOUT| SLC_LEVELBITS)) {
760		    output_data("(0x%x)",
761				pointer[i+SLC_FLAGS]);
762		}
763		output_data(" %d;",
764			    pointer[i+SLC_VALUE]);
765		if ((pointer[i+SLC_VALUE] == IAC) &&
766		    (pointer[i+SLC_VALUE+1] == IAC))
767		    i++;
768	    }
769	    for (; i < length; i++) {
770		output_data(" ?%d?",
771			    pointer[i]);
772	    }
773	    break;
774
775	case LM_MODE:
776	    output_data("MODE ");
777	    if (length < 3) {
778		output_data("(no mode??\?)");
779		break;
780	    }
781	    {
782		char tbuf[32];
783		snprintf(tbuf,
784			 sizeof(tbuf),
785			 "%s%s%s%s%s",
786			 pointer[2]&MODE_EDIT ? "|EDIT" : "",
787			 pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
788			 pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
789			 pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
790			 pointer[2]&MODE_ACK ? "|ACK" : "");
791		output_data("%s",
792			    tbuf[1] ? &tbuf[1] : "0");
793	    }
794	    if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
795		output_data(" (0x%x)",
796			    pointer[2]);
797	    }
798	    for (i = 3; i < length; i++) {
799		output_data(" ?0x%x?",
800			 pointer[i]);
801	    }
802	    break;
803	default:
804	    output_data("%d (unknown)",
805			pointer[1]);
806	    for (i = 2; i < length; i++) {
807		output_data(" %d", pointer[i]);
808	    }
809	}
810	break;
811
812    case TELOPT_STATUS: {
813	char *cp;
814	int j, k;
815
816	output_data("STATUS");
817
818	switch (pointer[1]) {
819	default:
820	    if (pointer[1] == TELQUAL_SEND)
821		output_data(" SEND");
822	    else
823		output_data(" %d (unknown)",
824			    pointer[1]);
825	    for (i = 2; i < length; i++) {
826		output_data(" ?%d?",
827			    pointer[i]);
828	    }
829	    break;
830	case TELQUAL_IS:
831	    output_data(" IS\r\n");
832
833	    for (i = 2; i < length; i++) {
834		switch(pointer[i]) {
835		case DO:	cp = "DO"; goto common2;
836		case DONT:	cp = "DONT"; goto common2;
837		case WILL:	cp = "WILL"; goto common2;
838		case WONT:	cp = "WONT"; goto common2;
839		common2:
840		i++;
841		if (TELOPT_OK(pointer[i]))
842		    output_data(" %s %s",
843				cp,
844				TELOPT(pointer[i]));
845		else
846		    output_data(" %s %d",
847				cp,
848				pointer[i]);
849
850		output_data("\r\n");
851		break;
852
853		case SB:
854		    output_data(" SB ");
855		    i++;
856		    j = k = i;
857		    while (j < length) {
858			if (pointer[j] == SE) {
859			    if (j+1 == length)
860				break;
861			    if (pointer[j+1] == SE)
862				j++;
863			    else
864				break;
865			}
866			pointer[k++] = pointer[j++];
867		    }
868		    printsub(0, &pointer[i], k - i);
869		    if (i < length) {
870			output_data(" SE");
871			i = j;
872		    } else
873			i = j - 1;
874
875		    output_data("\r\n");
876
877		    break;
878
879		default:
880		    output_data(" %d",
881				pointer[i]);
882		    break;
883		}
884	    }
885	    break;
886	}
887	break;
888    }
889
890    case TELOPT_XDISPLOC:
891	output_data("X-DISPLAY-LOCATION ");
892	switch (pointer[1]) {
893	case TELQUAL_IS:
894	    output_data("IS \"%.*s\"",
895			length-2,
896			(char *)pointer+2);
897	    break;
898	case TELQUAL_SEND:
899	    output_data("SEND");
900	    break;
901	default:
902	    output_data("- unknown qualifier %d (0x%x).",
903			pointer[1], pointer[1]);
904	}
905	break;
906
907    case TELOPT_NEW_ENVIRON:
908	output_data("NEW-ENVIRON ");
909	goto env_common1;
910    case TELOPT_OLD_ENVIRON:
911	output_data("OLD-ENVIRON");
912    env_common1:
913	switch (pointer[1]) {
914	case TELQUAL_IS:
915	    output_data("IS ");
916	    goto env_common;
917	case TELQUAL_SEND:
918	    output_data("SEND ");
919	    goto env_common;
920	case TELQUAL_INFO:
921	    output_data("INFO ");
922	env_common:
923	    {
924		int noquote = 2;
925		for (i = 2; i < length; i++ ) {
926		    switch (pointer[i]) {
927		    case NEW_ENV_VAR:
928			output_data("\" VAR " + noquote);
929			noquote = 2;
930			break;
931
932		    case NEW_ENV_VALUE:
933			output_data("\" VALUE " + noquote);
934			noquote = 2;
935			break;
936
937		    case ENV_ESC:
938			output_data("\" ESC " + noquote);
939			noquote = 2;
940			break;
941
942		    case ENV_USERVAR:
943			output_data("\" USERVAR " + noquote);
944			noquote = 2;
945			break;
946
947		    default:
948			if (isprint(pointer[i]) && pointer[i] != '"') {
949			    if (noquote) {
950				output_data ("\"");
951				noquote = 0;
952			    }
953			    output_data ("%c", pointer[i]);
954			} else {
955			    output_data("\" %03o " + noquote,
956					pointer[i]);
957			    noquote = 2;
958			}
959			break;
960		    }
961		}
962		if (!noquote)
963		    output_data ("\"");
964		break;
965	    }
966	}
967	break;
968
969#ifdef AUTHENTICATION
970    case TELOPT_AUTHENTICATION:
971	output_data("AUTHENTICATION");
972
973	if (length < 2) {
974	    output_data(" (empty suboption??\?)");
975	    break;
976	}
977	switch (pointer[1]) {
978	case TELQUAL_REPLY:
979	case TELQUAL_IS:
980	    output_data(" %s ",
981			(pointer[1] == TELQUAL_IS) ?
982			"IS" : "REPLY");
983	    if (AUTHTYPE_NAME_OK(pointer[2]))
984		output_data("%s ",
985			    AUTHTYPE_NAME(pointer[2]));
986	    else
987		output_data("%d ",
988			    pointer[2]);
989	    if (length < 3) {
990		output_data("(partial suboption??\?)");
991		break;
992	    }
993	    output_data("%s|%s",
994			((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
995			"CLIENT" : "SERVER",
996			((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
997			"MUTUAL" : "ONE-WAY");
998
999	    auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
1000	    output_data("%s",
1001			buf);
1002	    break;
1003
1004	case TELQUAL_SEND:
1005	    i = 2;
1006	    output_data(" SEND ");
1007	    while (i < length) {
1008		if (AUTHTYPE_NAME_OK(pointer[i]))
1009		    output_data("%s ",
1010				AUTHTYPE_NAME(pointer[i]));
1011		else
1012		    output_data("%d ",
1013				pointer[i]);
1014		if (++i >= length) {
1015		    output_data("(partial suboption??\?)");
1016		    break;
1017		}
1018		output_data("%s|%s ",
1019			    ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
1020			    "CLIENT" : "SERVER",
1021			    ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
1022			    "MUTUAL" : "ONE-WAY");
1023		++i;
1024	    }
1025	    break;
1026
1027	case TELQUAL_NAME:
1028	    i = 2;
1029	    output_data(" NAME \"%.*s\"",
1030			length - 2,
1031			pointer);
1032	    break;
1033
1034	default:
1035	    for (i = 2; i < length; i++) {
1036		output_data(" ?%d?",
1037			    pointer[i]);
1038	    }
1039	    break;
1040	}
1041	break;
1042#endif
1043
1044#ifdef ENCRYPTION
1045    case TELOPT_ENCRYPT:
1046	output_data("ENCRYPT");
1047	if (length < 2) {
1048	    output_data(" (empty suboption?)");
1049	    break;
1050	}
1051	switch (pointer[1]) {
1052	case ENCRYPT_START:
1053	    output_data(" START");
1054	    break;
1055
1056	case ENCRYPT_END:
1057	    output_data(" END");
1058	    break;
1059
1060	case ENCRYPT_REQSTART:
1061	    output_data(" REQUEST-START");
1062	    break;
1063
1064	case ENCRYPT_REQEND:
1065	    output_data(" REQUEST-END");
1066	    break;
1067
1068	case ENCRYPT_IS:
1069	case ENCRYPT_REPLY:
1070	    output_data(" %s ",
1071			(pointer[1] == ENCRYPT_IS) ?
1072			"IS" : "REPLY");
1073	    if (length < 3) {
1074		output_data(" (partial suboption?)");
1075		break;
1076	    }
1077	    if (ENCTYPE_NAME_OK(pointer[2]))
1078		output_data("%s ",
1079			    ENCTYPE_NAME(pointer[2]));
1080	    else
1081		output_data(" %d (unknown)",
1082			    pointer[2]);
1083
1084	    encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
1085	    output_data("%s",
1086			buf);
1087	    break;
1088
1089	case ENCRYPT_SUPPORT:
1090	    i = 2;
1091	    output_data(" SUPPORT ");
1092	    while (i < length) {
1093		if (ENCTYPE_NAME_OK(pointer[i]))
1094		    output_data("%s ",
1095				ENCTYPE_NAME(pointer[i]));
1096		else
1097		    output_data("%d ",
1098				pointer[i]);
1099		i++;
1100	    }
1101	    break;
1102
1103	case ENCRYPT_ENC_KEYID:
1104	    output_data(" ENC_KEYID %d", pointer[1]);
1105	    goto encommon;
1106
1107	case ENCRYPT_DEC_KEYID:
1108	    output_data(" DEC_KEYID %d", pointer[1]);
1109	    goto encommon;
1110
1111	default:
1112	    output_data(" %d (unknown)", pointer[1]);
1113	encommon:
1114	    for (i = 2; i < length; i++) {
1115		output_data(" %d", pointer[i]);
1116	    }
1117	    break;
1118	}
1119	break;
1120#endif
1121
1122    default:
1123	if (TELOPT_OK(pointer[0]))
1124	    output_data("%s (unknown)",
1125			TELOPT(pointer[0]));
1126	else
1127	    output_data("%d (unknown)",
1128			pointer[i]);
1129	for (i = 1; i < length; i++) {
1130	    output_data(" %d", pointer[i]);
1131	}
1132	break;
1133    }
1134    output_data("\r\n");
1135}
1136
1137/*
1138 * Dump a data buffer in hex and ascii to the output data stream.
1139 */
1140void
1141printdata(char *tag, char *ptr, int cnt)
1142{
1143    int i;
1144    char xbuf[30];
1145
1146    while (cnt) {
1147	/* flush net output buffer if no room for new data) */
1148	if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
1149	    netflush();
1150	}
1151
1152	/* add a line of output */
1153	output_data("%s: ", tag);
1154	for (i = 0; i < 20 && cnt; i++) {
1155	    output_data("%02x", *ptr);
1156	    if (isprint(*ptr)) {
1157		xbuf[i] = *ptr;
1158	    } else {
1159		xbuf[i] = '.';
1160	    }
1161	    if (i % 2) {
1162		output_data(" ");
1163	    }
1164	    cnt--;
1165	    ptr++;
1166	}
1167	xbuf[i] = '\0';
1168	output_data(" %s\r\n", xbuf);
1169    }
1170}
1171#endif /* DIAGNOSTICS */
1172