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1.1 root 1: /*
2: * Copyright (c) 1989 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted provided
6: * that: (1) source distributions retain this entire copyright notice and
7: * comment, and (2) distributions including binaries display the following
8: * acknowledgement: ``This product includes software developed by the
9: * University of California, Berkeley and its contributors'' in the
10: * documentation or other materials provided with the distribution and in
11: * all advertising materials mentioning features or use of this software.
12: * Neither the name of the University nor the names of its contributors may
13: * be used to endorse or promote products derived from this software without
14: * specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
16: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
17: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #ifndef lint
21: static char sccsid[] = "@(#)utility.c 5.4 (Berkeley) 6/28/90";
22: #endif /* not lint */
23:
24: #define PRINTOPTIONS
25: #include "telnetd.h"
26:
27: /*
28: * utility functions performing io related tasks
29: */
30:
31: /*
32: * ttloop
33: *
34: * A small subroutine to flush the network output buffer, get some data
35: * from the network, and pass it through the telnet state machine. We
36: * also flush the pty input buffer (by dropping its data) if it becomes
37: * too full.
38: */
39:
40: void
41: ttloop()
42: {
43: void netflush();
44:
45: #ifdef DIAGNOSTICS
46: if (diagnostic & TD_REPORT) {
47: sprintf(nfrontp, "td: ttloop\r\n");
48: nfrontp += strlen(nfrontp);
49: }
50: #endif /* DIAGNOSTICS */
51: if (nfrontp-nbackp) {
52: netflush();
53: }
54: ncc = read(net, netibuf, sizeof netibuf);
55: if (ncc < 0) {
56: syslog(LOG_INFO, "ttloop: read: %m\n");
57: exit(1);
58: } else if (ncc == 0) {
59: syslog(LOG_INFO, "ttloop: peer died: %m\n");
60: exit(1);
61: }
62: #ifdef DIAGNOSTICS
63: if (diagnostic & TD_REPORT) {
64: sprintf(nfrontp, "td: ttloop read %d chars\r\n", ncc);
65: nfrontp += strlen(nfrontp);
66: }
67: #endif /* DIAGNOSTICS */
68: netip = netibuf;
69: telrcv(); /* state machine */
70: if (ncc > 0) {
71: pfrontp = pbackp = ptyobuf;
72: telrcv();
73: }
74: } /* end of ttloop */
75:
76: /*
77: * Check a descriptor to see if out of band data exists on it.
78: */
79: stilloob(s)
80: int s; /* socket number */
81: {
82: static struct timeval timeout = { 0 };
83: fd_set excepts;
84: int value;
85:
86: do {
87: FD_ZERO(&excepts);
88: FD_SET(s, &excepts);
89: value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout);
90: } while ((value == -1) && (errno == EINTR));
91:
92: if (value < 0) {
93: fatalperror(pty, "select");
94: }
95: if (FD_ISSET(s, &excepts)) {
96: return 1;
97: } else {
98: return 0;
99: }
100: }
101:
102: ptyflush()
103: {
104: int n;
105:
106: if ((n = pfrontp - pbackp) > 0) {
107: #ifdef DIAGNOSTICS
108: if (diagnostic & (TD_REPORT | TD_PTYDATA)) {
109: sprintf(nfrontp, "td: ptyflush %d chars\r\n", n);
110: nfrontp += strlen(nfrontp);
111: }
112: if (diagnostic & TD_PTYDATA) {
113: printdata("pd", pbackp, n);
114: }
115: #endif /* DIAGNOSTICS */
116: n = write(pty, pbackp, n);
117: }
118: if (n < 0)
119: return;
120: pbackp += n;
121: if (pbackp == pfrontp)
122: pbackp = pfrontp = ptyobuf;
123: }
124:
125: /*
126: * nextitem()
127: *
128: * Return the address of the next "item" in the TELNET data
129: * stream. This will be the address of the next character if
130: * the current address is a user data character, or it will
131: * be the address of the character following the TELNET command
132: * if the current address is a TELNET IAC ("I Am a Command")
133: * character.
134: */
135: char *
136: nextitem(current)
137: char *current;
138: {
139: if ((*current&0xff) != IAC) {
140: return current+1;
141: }
142: switch (*(current+1)&0xff) {
143: case DO:
144: case DONT:
145: case WILL:
146: case WONT:
147: return current+3;
148: case SB: /* loop forever looking for the SE */
149: {
150: register char *look = current+2;
151:
152: for (;;) {
153: if ((*look++&0xff) == IAC) {
154: if ((*look++&0xff) == SE) {
155: return look;
156: }
157: }
158: }
159: }
160: default:
161: return current+2;
162: }
163: } /* end of nextitem */
164:
165:
166: /*
167: * netclear()
168: *
169: * We are about to do a TELNET SYNCH operation. Clear
170: * the path to the network.
171: *
172: * Things are a bit tricky since we may have sent the first
173: * byte or so of a previous TELNET command into the network.
174: * So, we have to scan the network buffer from the beginning
175: * until we are up to where we want to be.
176: *
177: * A side effect of what we do, just to keep things
178: * simple, is to clear the urgent data pointer. The principal
179: * caller should be setting the urgent data pointer AFTER calling
180: * us in any case.
181: */
182: netclear()
183: {
184: register char *thisitem, *next;
185: char *good;
186: #define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
187: ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
188:
189: thisitem = netobuf;
190:
191: while ((next = nextitem(thisitem)) <= nbackp) {
192: thisitem = next;
193: }
194:
195: /* Now, thisitem is first before/at boundary. */
196:
197: good = netobuf; /* where the good bytes go */
198:
199: while (nfrontp > thisitem) {
200: if (wewant(thisitem)) {
201: int length;
202:
203: next = thisitem;
204: do {
205: next = nextitem(next);
206: } while (wewant(next) && (nfrontp > next));
207: length = next-thisitem;
208: bcopy(thisitem, good, length);
209: good += length;
210: thisitem = next;
211: } else {
212: thisitem = nextitem(thisitem);
213: }
214: }
215:
216: nbackp = netobuf;
217: nfrontp = good; /* next byte to be sent */
218: neturg = 0;
219: } /* end of netclear */
220:
221: /*
222: * netflush
223: * Send as much data as possible to the network,
224: * handling requests for urgent data.
225: */
226: void
227: netflush()
228: {
229: int n;
230: extern int not42;
231:
232: if ((n = nfrontp - nbackp) > 0) {
233: #ifdef DIAGNOSTICS
234: if (diagnostic & TD_REPORT) {
235: sprintf(nfrontp, "td: netflush %d chars\r\n", n);
236: n += strlen(nfrontp); /* get count first */
237: nfrontp += strlen(nfrontp); /* then move pointer */
238: }
239: #endif /* DIAGNOSTICS */
240: /*
241: * if no urgent data, or if the other side appears to be an
242: * old 4.2 client (and thus unable to survive TCP urgent data),
243: * write the entire buffer in non-OOB mode.
244: */
245: if ((neturg == 0) || (not42 == 0)) {
246: n = write(net, nbackp, n); /* normal write */
247: } else {
248: n = neturg - nbackp;
249: /*
250: * In 4.2 (and 4.3) systems, there is some question about
251: * what byte in a sendOOB operation is the "OOB" data.
252: * To make ourselves compatible, we only send ONE byte
253: * out of band, the one WE THINK should be OOB (though
254: * we really have more the TCP philosophy of urgent data
255: * rather than the Unix philosophy of OOB data).
256: */
257: if (n > 1) {
258: n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */
259: } else {
260: n = send(net, nbackp, n, MSG_OOB); /* URGENT data */
261: }
262: }
263: }
264: if (n < 0) {
265: if (errno == EWOULDBLOCK || errno == EINTR)
266: return;
267: cleanup();
268: }
269: nbackp += n;
270: if (nbackp >= neturg) {
271: neturg = 0;
272: }
273: if (nbackp == nfrontp) {
274: nbackp = nfrontp = netobuf;
275: }
276: return;
277: } /* end of netflush */
278:
279:
280: /*
281: * writenet
282: *
283: * Just a handy little function to write a bit of raw data to the net.
284: * It will force a transmit of the buffer if necessary
285: *
286: * arguments
287: * ptr - A pointer to a character string to write
288: * len - How many bytes to write
289: */
290: writenet(ptr, len)
291: register char *ptr;
292: register int len;
293: {
294: /* flush buffer if no room for new data) */
295: if ((&netobuf[BUFSIZ] - nfrontp) < len) {
296: /* if this fails, don't worry, buffer is a little big */
297: netflush();
298: }
299:
300: bcopy(ptr, nfrontp, len);
301: nfrontp += len;
302:
303: } /* end of writenet */
304:
305:
306: /*
307: * miscellaneous functions doing a variety of little jobs follow ...
308: */
309:
310:
311: fatal(f, msg)
312: int f;
313: char *msg;
314: {
315: char buf[BUFSIZ];
316:
317: (void) sprintf(buf, "telnetd: %s.\r\n", msg);
318: (void) write(f, buf, (int)strlen(buf));
319: sleep(1); /*XXX*/
320: exit(1);
321: }
322:
323: fatalperror(f, msg)
324: int f;
325: char *msg;
326: {
327: char buf[BUFSIZ], *strerror();
328:
329: (void) sprintf(buf, "%s: %s\r\n", msg, strerror(errno));
330: fatal(f, buf);
331: }
332:
333: char editedhost[32];
334:
335: edithost(pat, host)
336: register char *pat;
337: register char *host;
338: {
339: register char *res = editedhost;
340: char *strncpy();
341:
342: if (!pat)
343: pat = "";
344: while (*pat) {
345: switch (*pat) {
346:
347: case '#':
348: if (*host)
349: host++;
350: break;
351:
352: case '@':
353: if (*host)
354: *res++ = *host++;
355: break;
356:
357: default:
358: *res++ = *pat;
359: break;
360: }
361: if (res == &editedhost[sizeof editedhost - 1]) {
362: *res = '\0';
363: return;
364: }
365: pat++;
366: }
367: if (*host)
368: (void) strncpy(res, host,
369: sizeof editedhost - (res - editedhost) -1);
370: else
371: *res = '\0';
372: editedhost[sizeof editedhost - 1] = '\0';
373: }
374:
375: static char *putlocation;
376:
377: putstr(s)
378: register char *s;
379: {
380:
381: while (*s)
382: putchr(*s++);
383: }
384:
385: putchr(cc)
386: {
387: *putlocation++ = cc;
388: }
389:
390: putf(cp, where)
391: register char *cp;
392: char *where;
393: {
394: char *slash;
395: #ifndef NO_GETTYTAB
396: char datebuffer[60];
397: #endif /* NO_GETTYTAB */
398: extern char *rindex();
399:
400: putlocation = where;
401:
402: while (*cp) {
403: if (*cp != '%') {
404: putchr(*cp++);
405: continue;
406: }
407: switch (*++cp) {
408:
409: case 't':
410: slash = rindex(line, '/');
411: if (slash == (char *) 0)
412: putstr(line);
413: else
414: putstr(&slash[1]);
415: break;
416:
417: case 'h':
418: putstr(editedhost);
419: break;
420:
421: #ifndef NO_GETTYTAB
422: case 'd':
423: get_date(datebuffer);
424: putstr(datebuffer);
425: break;
426: #endif /* NO_GETTYTAB */
427:
428: case '%':
429: putchr('%');
430: break;
431: }
432: cp++;
433: }
434: }
435:
436: /*ARGSUSED*/
437: #ifdef NO_GETTYTAB
438: getent(cp, name)
439: char *cp, *name;
440: {
441: return(0);
442: }
443:
444: /*ARGSUSED*/
445: char *
446: getstr(cp, cpp)
447: char *cp, **cpp;
448: {
449: return(0);
450: }
451: #endif /* NO_GETTYTAB */
452:
453: #ifdef DIAGNOSTICS
454: /*
455: * Print telnet options and commands in plain text, if possible.
456: */
457: void
458: printoption(fmt, option)
459: register char *fmt;
460: register int option;
461: {
462: if (TELOPT_OK(option))
463: sprintf(nfrontp, "%s %s\r\n", fmt, TELOPT(option));
464: else if (TELCMD_OK(option))
465: sprintf(nfrontp, "%s %s\r\n", fmt, TELCMD(option));
466: else
467: sprintf(nfrontp, "%s %d\r\n", fmt, option);
468: nfrontp += strlen(nfrontp);
469: return;
470: }
471:
472: char *slcnames[] = { SLC_NAMES };
473:
474: void
475: printsub(dirp, pointer, length)
476: char *dirp;
477: unsigned char *pointer; /* where suboption data sits */
478: int length; /* length of suboption data */
479: {
480: register int i;
481:
482: if (dirp) {
483: sprintf(nfrontp, "%s suboption ", dirp);
484: nfrontp += strlen(nfrontp);
485: if (length >= 3) {
486: register int j;
487:
488: i = pointer[length-2];
489: j = pointer[length-1];
490:
491: if (i != IAC || j != SE) {
492: sprintf(nfrontp, "(terminated by ");
493: nfrontp += strlen(nfrontp);
494: if (TELOPT_OK(i))
495: sprintf(nfrontp, "%s ", TELOPT(i));
496: else if (TELCMD_OK(i))
497: sprintf(nfrontp, "%s ", TELCMD(i));
498: else
499: sprintf(nfrontp, "%d ", i);
500: nfrontp += strlen(nfrontp);
501: if (TELOPT_OK(j))
502: sprintf(nfrontp, "%s", TELOPT(j));
503: else if (TELCMD_OK(j))
504: sprintf(nfrontp, "%s", TELCMD(j));
505: else
506: sprintf(nfrontp, "%d", j);
507: nfrontp += strlen(nfrontp);
508: sprintf(nfrontp, ", not IAC SE!) ");
509: nfrontp += strlen(nfrontp);
510: }
511: }
512: length -= 2;
513: }
514: if (length < 1) {
515: sprintf(nfrontp, "(Empty suboption???)");
516: nfrontp += strlen(nfrontp);
517: return;
518: }
519: switch (pointer[0]) {
520: case TELOPT_TTYPE:
521: sprintf(nfrontp, "TERMINAL-TYPE ");
522: nfrontp += strlen(nfrontp);
523: switch (pointer[1]) {
524: case TELQUAL_IS:
525: sprintf(nfrontp, "IS \"%.*s\"", length-2, (char *)pointer+2);
526: break;
527: case TELQUAL_SEND:
528: sprintf(nfrontp, "SEND");
529: break;
530: default:
531: sprintf(nfrontp,
532: "- unknown qualifier %d (0x%x).",
533: pointer[1], pointer[1]);
534: }
535: nfrontp += strlen(nfrontp);
536: break;
537: case TELOPT_TSPEED:
538: sprintf(nfrontp, "TERMINAL-SPEED");
539: nfrontp += strlen(nfrontp);
540: if (length < 2) {
541: sprintf(nfrontp, " (empty suboption???)");
542: nfrontp += strlen(nfrontp);
543: break;
544: }
545: switch (pointer[1]) {
546: case TELQUAL_IS:
547: sprintf(nfrontp, " IS %.*s", length-2, (char *)pointer+2);
548: nfrontp += strlen(nfrontp);
549: break;
550: default:
551: if (pointer[1] == 1)
552: sprintf(nfrontp, " SEND");
553: else
554: sprintf(nfrontp, " %d (unknown)", pointer[1]);
555: nfrontp += strlen(nfrontp);
556: for (i = 2; i < length; i++) {
557: sprintf(nfrontp, " ?%d?", pointer[i]);
558: nfrontp += strlen(nfrontp);
559: }
560: break;
561: }
562: break;
563:
564: case TELOPT_LFLOW:
565: sprintf(nfrontp, "TOGGLE-FLOW-CONTROL");
566: nfrontp += strlen(nfrontp);
567: if (length < 2) {
568: sprintf(nfrontp, " (empty suboption???)");
569: nfrontp += strlen(nfrontp);
570: break;
571: }
572: switch (pointer[1]) {
573: case 0:
574: sprintf(nfrontp, " OFF"); break;
575: case 1:
576: sprintf(nfrontp, " ON"); break;
577: default:
578: sprintf(nfrontp, " %d (unknown)", pointer[1]);
579: }
580: nfrontp += strlen(nfrontp);
581: for (i = 2; i < length; i++) {
582: sprintf(nfrontp, " ?%d?", pointer[i]);
583: nfrontp += strlen(nfrontp);
584: }
585: break;
586:
587: case TELOPT_NAWS:
588: sprintf(nfrontp, "NAWS");
589: nfrontp += strlen(nfrontp);
590: if (length < 2) {
591: sprintf(nfrontp, " (empty suboption???)");
592: nfrontp += strlen(nfrontp);
593: break;
594: }
595: if (length == 2) {
596: sprintf(nfrontp, " ?%d?", pointer[1]);
597: nfrontp += strlen(nfrontp);
598: break;
599: }
600: sprintf(nfrontp, " %d %d (%d)",
601: pointer[1], pointer[2],
602: (int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
603: nfrontp += strlen(nfrontp);
604: if (length == 4) {
605: sprintf(nfrontp, " ?%d?", pointer[3]);
606: nfrontp += strlen(nfrontp);
607: break;
608: }
609: sprintf(nfrontp, " %d %d (%d)",
610: pointer[3], pointer[4],
611: (int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
612: nfrontp += strlen(nfrontp);
613: for (i = 5; i < length; i++) {
614: sprintf(nfrontp, " ?%d?", pointer[i]);
615: nfrontp += strlen(nfrontp);
616: }
617: break;
618:
619: case TELOPT_LINEMODE:
620: sprintf(nfrontp, "LINEMODE ");
621: nfrontp += strlen(nfrontp);
622: if (length < 2) {
623: sprintf(nfrontp, " (empty suboption???)");
624: nfrontp += strlen(nfrontp);
625: break;
626: }
627: switch (pointer[1]) {
628: case WILL:
629: sprintf(nfrontp, "WILL ");
630: goto common;
631: case WONT:
632: sprintf(nfrontp, "WONT ");
633: goto common;
634: case DO:
635: sprintf(nfrontp, "DO ");
636: goto common;
637: case DONT:
638: sprintf(nfrontp, "DONT ");
639: common:
640: nfrontp += strlen(nfrontp);
641: if (length < 3) {
642: sprintf(nfrontp, "(no option???)");
643: nfrontp += strlen(nfrontp);
644: break;
645: }
646: switch (pointer[2]) {
647: case LM_FORWARDMASK:
648: sprintf(nfrontp, "Forward Mask");
649: nfrontp += strlen(nfrontp);
650: for (i = 3; i < length; i++) {
651: sprintf(nfrontp, " %x", pointer[i]);
652: nfrontp += strlen(nfrontp);
653: }
654: break;
655: default:
656: sprintf(nfrontp, "%d (unknown)", pointer[2]);
657: nfrontp += strlen(nfrontp);
658: for (i = 3; i < length; i++) {
659: sprintf(nfrontp, " %d", pointer[i]);
660: nfrontp += strlen(nfrontp);
661: }
662: break;
663: }
664: break;
665:
666: case LM_SLC:
667: sprintf(nfrontp, "SLC");
668: nfrontp += strlen(nfrontp);
669: for (i = 2; i < length - 2; i += 3) {
670: if (pointer[i+SLC_FUNC] <= NSLC)
671: sprintf(nfrontp, " %s", slcnames[pointer[i+SLC_FUNC]]);
672: else
673: sprintf(nfrontp, " %d", pointer[i+SLC_FUNC]);
674: nfrontp += strlen(nfrontp);
675: switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
676: case SLC_NOSUPPORT:
677: sprintf(nfrontp, " NOSUPPORT"); break;
678: case SLC_CANTCHANGE:
679: sprintf(nfrontp, " CANTCHANGE"); break;
680: case SLC_VARIABLE:
681: sprintf(nfrontp, " VARIABLE"); break;
682: case SLC_DEFAULT:
683: sprintf(nfrontp, " DEFAULT"); break;
684: }
685: nfrontp += strlen(nfrontp);
686: sprintf(nfrontp, "%s%s%s",
687: pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
688: pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
689: pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
690: nfrontp += strlen(nfrontp);
691: if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
692: SLC_FLUSHOUT| SLC_LEVELBITS)) {
693: sprintf(nfrontp, "(0x%x)", pointer[i+SLC_FLAGS]);
694: nfrontp += strlen(nfrontp);
695: }
696: sprintf(nfrontp, " %d;", pointer[i+SLC_VALUE]);
697: nfrontp += strlen(nfrontp);
698: if ((pointer[i+SLC_VALUE] == IAC) &&
699: (pointer[i+SLC_VALUE+1] == IAC))
700: i++;
701: }
702: for (; i < length; i++) {
703: sprintf(nfrontp, " ?%d?", pointer[i]);
704: nfrontp += strlen(nfrontp);
705: }
706: break;
707:
708: case LM_MODE:
709: sprintf(nfrontp, "MODE ");
710: nfrontp += strlen(nfrontp);
711: if (length < 3) {
712: sprintf(nfrontp, "(no mode???)");
713: nfrontp += strlen(nfrontp);
714: break;
715: }
716: {
717: char tbuf[32];
718: sprintf(tbuf, "%s%s%s%s%s",
719: pointer[2]&MODE_EDIT ? "|EDIT" : "",
720: pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
721: pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
722: pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
723: pointer[2]&MODE_ACK ? "|ACK" : "");
724: sprintf(nfrontp, "%s", tbuf[1] ? &tbuf[1] : "0");
725: nfrontp += strlen(nfrontp);
726: }
727: if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
728: sprintf(nfrontp, " (0x%x)", pointer[2]);
729: nfrontp += strlen(nfrontp);
730: }
731: for (i = 3; i < length; i++) {
732: sprintf(nfrontp, " ?0x%x?", pointer[i]);
733: nfrontp += strlen(nfrontp);
734: }
735: break;
736: default:
737: sprintf(nfrontp, "%d (unknown)", pointer[1]);
738: nfrontp += strlen(nfrontp);
739: for (i = 2; i < length; i++) {
740: sprintf(nfrontp, " %d", pointer[i]);
741: nfrontp += strlen(nfrontp);
742: }
743: }
744: break;
745:
746: case TELOPT_STATUS: {
747: register char *cp;
748: register int j, k;
749:
750: sprintf(nfrontp, "STATUS");
751: nfrontp += strlen(nfrontp);
752:
753: switch (pointer[1]) {
754: default:
755: if (pointer[1] == TELQUAL_SEND)
756: sprintf(nfrontp, " SEND");
757: else
758: sprintf(nfrontp, " %d (unknown)", pointer[1]);
759: nfrontp += strlen(nfrontp);
760: for (i = 2; i < length; i++) {
761: sprintf(nfrontp, " ?%d?", pointer[i]);
762: nfrontp += strlen(nfrontp);
763: }
764: break;
765: case TELQUAL_IS:
766: sprintf(nfrontp, " IS\r\n");
767: nfrontp += strlen(nfrontp);
768:
769: for (i = 2; i < length; i++) {
770: switch(pointer[i]) {
771: case DO: cp = "DO"; goto common2;
772: case DONT: cp = "DONT"; goto common2;
773: case WILL: cp = "WILL"; goto common2;
774: case WONT: cp = "WONT"; goto common2;
775: common2:
776: i++;
777: if (TELOPT_OK((int)pointer[i]))
778: sprintf(nfrontp, " %s %s", cp, TELOPT(pointer[i]));
779: else
780: sprintf(nfrontp, " %s %d", cp, pointer[i]);
781: nfrontp += strlen(nfrontp);
782:
783: sprintf(nfrontp, "\r\n");
784: nfrontp += strlen(nfrontp);
785: break;
786:
787: case SB:
788: sprintf(nfrontp, " SB ");
789: nfrontp += strlen(nfrontp);
790: i++;
791: j = k = i;
792: while (j < length) {
793: if (pointer[j] == SE) {
794: if (j+1 == length)
795: break;
796: if (pointer[j+1] == SE)
797: j++;
798: else
799: break;
800: }
801: pointer[k++] = pointer[j++];
802: }
803: printsub(0, &pointer[i], k - i);
804: if (i < length) {
805: sprintf(nfrontp, " SE");
806: nfrontp += strlen(nfrontp);
807: i = j;
808: } else
809: i = j - 1;
810:
811: sprintf(nfrontp, "\r\n");
812: nfrontp += strlen(nfrontp);
813:
814: break;
815:
816: default:
817: sprintf(nfrontp, " %d", pointer[i]);
818: nfrontp += strlen(nfrontp);
819: break;
820: }
821: }
822: break;
823: }
824: break;
825: }
826:
827: case TELOPT_XDISPLOC:
828: sprintf(nfrontp, "X-DISPLAY-LOCATION ");
829: nfrontp += strlen(nfrontp);
830: switch (pointer[1]) {
831: case TELQUAL_IS:
832: sprintf(nfrontp, "IS \"%.*s\"", length-2, (char *)pointer+2);
833: break;
834: case TELQUAL_SEND:
835: sprintf(nfrontp, "SEND");
836: break;
837: default:
838: sprintf(nfrontp, "- unknown qualifier %d (0x%x).",
839: pointer[1], pointer[1]);
840: }
841: nfrontp += strlen(nfrontp);
842: break;
843:
844: case TELOPT_ENVIRON:
845: sprintf(nfrontp, "ENVIRON ");
846: nfrontp += strlen(nfrontp);
847: switch (pointer[1]) {
848: case TELQUAL_IS:
849: sprintf(nfrontp, "IS ");
850: goto env_common;
851: case TELQUAL_SEND:
852: sprintf(nfrontp, "SEND ");
853: goto env_common;
854: case TELQUAL_INFO:
855: sprintf(nfrontp, "INFO ");
856: env_common:
857: nfrontp += strlen(nfrontp);
858: {
859: register int noquote = 2;
860: for (i = 2; i < length; i++ ) {
861: switch (pointer[i]) {
862: case ENV_VAR:
863: if (pointer[1] == TELQUAL_SEND)
864: goto def_case;
865: sprintf(nfrontp, "\" VAR " + noquote);
866: nfrontp += strlen(nfrontp);
867: noquote = 2;
868: break;
869:
870: case ENV_VALUE:
871: sprintf(nfrontp, "\" VALUE " + noquote);
872: nfrontp += strlen(nfrontp);
873: noquote = 2;
874: break;
875:
876: case ENV_ESC:
877: sprintf(nfrontp, "\" ESC " + noquote);
878: nfrontp += strlen(nfrontp);
879: noquote = 2;
880: break;
881:
882: default:
883: def_case:
884: if (isprint(pointer[i]) && pointer[i] != '"') {
885: if (noquote) {
886: *nfrontp++ = '"';
887: noquote = 0;
888: }
889: *nfrontp++ = pointer[i];
890: } else {
891: sprintf(nfrontp, "\" %03o " + noquote,
892: pointer[i]);
893: nfrontp += strlen(nfrontp);
894: noquote = 2;
895: }
896: break;
897: }
898: }
899: if (!noquote)
900: *nfrontp++ = '"';
901: break;
902: }
903: }
904: break;
905:
906: default:
907: sprintf(nfrontp, "Unknown option ");
908: nfrontp += strlen(nfrontp);
909: for (i = 0; i < length; i++) {
910: sprintf(nfrontp, " %d", pointer[i]);
911: nfrontp += strlen(nfrontp);
912: }
913: break;
914: }
915: sprintf(nfrontp, "\r\n");
916: nfrontp += strlen(nfrontp);
917: }
918:
919: /*
920: * Dump a data buffer in hex and ascii to the output data stream.
921: */
922: void
923: printdata(tag, ptr, cnt)
924: register char *tag;
925: register char *ptr;
926: register int cnt;
927: {
928: register int i;
929: char xbuf[30];
930:
931: while (cnt) {
932: /* flush net output buffer if no room for new data) */
933: if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
934: netflush();
935: }
936:
937: /* add a line of output */
938: sprintf(nfrontp, "%s: ", tag);
939: nfrontp += strlen(nfrontp);
940: for (i = 0; i < 20 && cnt; i++) {
941: sprintf(nfrontp, "%02x", *ptr);
942: nfrontp += strlen(nfrontp);
943: if (isprint(*ptr)) {
944: xbuf[i] = *ptr;
945: } else {
946: xbuf[i] = '.';
947: }
948: if (i % 2) {
949: *nfrontp = ' ';
950: nfrontp++;
951: }
952: cnt--;
953: ptr++;
954: }
955: xbuf[i] = '\0';
956: sprintf(nfrontp, " %s\r\n", xbuf );
957: nfrontp += strlen(nfrontp);
958: }
959: }
960:
961: #endif /* DIAGNOSTICS */
962:
963: #ifdef NO_STRERROR
964: char *
965: strerror(errno)
966: {
967: extern char *sys_errlist[];
968:
969: return(sys_errlist[errno]);
970: }
971: #endif
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