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network - Fix socket & mbuf leak
[dragonfly.git] / lib / libc / nameser / ns_print.c
blob4dc20dcfc9b97966cfbdea2bb41bf946b3390e4d
1 /*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996-1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #ifndef lint
19 static const char rcsid[] = "$Id: ns_print.c,v 1.10 2005/04/27 04:56:40 sra Exp $";
20 #endif
21
22 /* Import. */
23
24 #include "port_before.h"
25
26 #include <sys/types.h>
27 #include <sys/socket.h>
28
29 #include <netinet/in.h>
30 #include <arpa/nameser.h>
31 #include <arpa/inet.h>
32
33 #ifdef _LIBC
34 #include <assert.h>
35 #define INSIST(cond) assert(cond)
36 #else
37 #include <isc/assertions.h>
38 #include <isc/dst.h>
39 #endif
40 #include <errno.h>
41 #include <resolv.h>
42 #include <string.h>
43 #include <ctype.h>
44
45 #include "port_after.h"
46
47 #ifdef SPRINTF_CHAR
48 # define SPRINTF(x) strlen(sprintf/**/x)
49 #else
50 # define SPRINTF(x) ((size_t)sprintf x)
51 #endif
52
53 /* Forward. */
54
55 static size_t prune_origin(const char *name, const char *origin);
56 static int charstr(const u_char *rdata, const u_char *edata,
57 char **buf, size_t *buflen);
58 static int addname(const u_char *msg, size_t msglen,
59 const u_char **p, const char *origin,
60 char **buf, size_t *buflen);
61 static void addlen(size_t len, char **buf, size_t *buflen);
62 static int addstr(const char *src, size_t len,
63 char **buf, size_t *buflen);
64 static int addtab(size_t len, size_t target, int spaced,
65 char **buf, size_t *buflen);
66
67 /* Macros. */
68
69 #define T(x) \
70 do { \
71 if ((x) < 0) \
72 return (-1); \
73 } while (0)
74
75 /* Public. */
76
77 /*%
78 * Convert an RR to presentation format.
79 *
80 * return:
81 *\li Number of characters written to buf, or -1 (check errno).
82 */
83 int
84 ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
85 const char *name_ctx, const char *origin,
86 char *buf, size_t buflen)
87 {
88 int n;
89
90 n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
91 ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
92 ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
93 name_ctx, origin, buf, buflen);
94 return (n);
95 }
96
97 /*%
98 * Convert the fields of an RR into presentation format.
99 *
100 * return:
101 *\li Number of characters written to buf, or -1 (check errno).
102 */
103 int
104 ns_sprintrrf(const u_char *msg, size_t msglen,
105 const char *name, ns_class class, ns_type type,
106 u_long ttl, const u_char *rdata, size_t rdlen,
107 const char *name_ctx, const char *origin,
108 char *buf, size_t buflen)
109 {
110 const char *obuf = buf;
111 const u_char *edata = rdata + rdlen;
112 int spaced = 0;
113
114 const char *comment;
115 char tmp[100];
116 int len, x;
117
118 /*
119 * Owner.
120 */
121 if (name_ctx != NULL && ns_samename(name_ctx, name) == 1) {
122 T(addstr("\t\t\t", 3, &buf, &buflen));
123 } else {
124 len = prune_origin(name, origin);
125 if (*name == '\0') {
126 goto root;
127 } else if (len == 0) {
128 T(addstr("@\t\t\t", 4, &buf, &buflen));
129 } else {
130 T(addstr(name, len, &buf, &buflen));
131 /* Origin not used or not root, and no trailing dot? */
132 if (((origin == NULL || origin[0] == '\0') ||
133 (origin[0] != '.' && origin[1] != '\0' &&
134 name[len] == '\0')) && name[len - 1] != '.') {
135 root:
136 T(addstr(".", 1, &buf, &buflen));
137 len++;
138 }
139 T(spaced = addtab(len, 24, spaced, &buf, &buflen));
140 }
141 }
142
143 /*
144 * TTL, Class, Type.
145 */
146 T(x = ns_format_ttl(ttl, buf, buflen));
147 addlen(x, &buf, &buflen);
148 len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
149 T(addstr(tmp, len, &buf, &buflen));
150 T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));
151
152 /*
153 * RData.
154 */
155 switch (type) {
156 case ns_t_a:
157 if (rdlen != (size_t)NS_INADDRSZ)
158 goto formerr;
159 (void) inet_ntop(AF_INET, rdata, buf, buflen);
160 addlen(strlen(buf), &buf, &buflen);
161 break;
162
163 case ns_t_cname:
164 case ns_t_mb:
165 case ns_t_mg:
166 case ns_t_mr:
167 case ns_t_ns:
168 case ns_t_ptr:
169 case ns_t_dname:
170 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
171 break;
172
173 case ns_t_hinfo:
174 case ns_t_isdn:
175 /* First word. */
176 T(len = charstr(rdata, edata, &buf, &buflen));
177 if (len == 0)
178 goto formerr;
179 rdata += len;
180 T(addstr(" ", 1, &buf, &buflen));
181
182
183 /* Second word, optional in ISDN records. */
184 if (type == ns_t_isdn && rdata == edata)
185 break;
186
187 T(len = charstr(rdata, edata, &buf, &buflen));
188 if (len == 0)
189 goto formerr;
190 rdata += len;
191 break;
192
193 case ns_t_soa: {
194 u_long t;
195
196 /* Server name. */
197 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
198 T(addstr(" ", 1, &buf, &buflen));
199
200 /* Administrator name. */
201 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
202 T(addstr(" (\n", 3, &buf, &buflen));
203 spaced = 0;
204
205 if ((edata - rdata) != 5*NS_INT32SZ)
206 goto formerr;
207
208 /* Serial number. */
209 t = ns_get32(rdata); rdata += NS_INT32SZ;
210 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
211 len = SPRINTF((tmp, "%lu", t));
212 T(addstr(tmp, len, &buf, &buflen));
213 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
214 T(addstr("; serial\n", 9, &buf, &buflen));
215 spaced = 0;
216
217 /* Refresh interval. */
218 t = ns_get32(rdata); rdata += NS_INT32SZ;
219 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
220 T(len = ns_format_ttl(t, buf, buflen));
221 addlen(len, &buf, &buflen);
222 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
223 T(addstr("; refresh\n", 10, &buf, &buflen));
224 spaced = 0;
225
226 /* Retry interval. */
227 t = ns_get32(rdata); rdata += NS_INT32SZ;
228 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
229 T(len = ns_format_ttl(t, buf, buflen));
230 addlen(len, &buf, &buflen);
231 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
232 T(addstr("; retry\n", 8, &buf, &buflen));
233 spaced = 0;
234
235 /* Expiry. */
236 t = ns_get32(rdata); rdata += NS_INT32SZ;
237 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
238 T(len = ns_format_ttl(t, buf, buflen));
239 addlen(len, &buf, &buflen);
240 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
241 T(addstr("; expiry\n", 9, &buf, &buflen));
242 spaced = 0;
243
244 /* Minimum TTL. */
245 t = ns_get32(rdata); rdata += NS_INT32SZ;
246 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
247 T(len = ns_format_ttl(t, buf, buflen));
248 addlen(len, &buf, &buflen);
249 T(addstr(" )", 2, &buf, &buflen));
250 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
251 T(addstr("; minimum\n", 10, &buf, &buflen));
252
253 break;
254 }
255
256 case ns_t_mx:
257 case ns_t_afsdb:
258 case ns_t_rt: {
259 u_int t;
260
261 if (rdlen < (size_t)NS_INT16SZ)
262 goto formerr;
263
264 /* Priority. */
265 t = ns_get16(rdata);
266 rdata += NS_INT16SZ;
267 len = SPRINTF((tmp, "%u ", t));
268 T(addstr(tmp, len, &buf, &buflen));
269
270 /* Target. */
271 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
272
273 break;
274 }
275
276 case ns_t_px: {
277 u_int t;
278
279 if (rdlen < (size_t)NS_INT16SZ)
280 goto formerr;
281
282 /* Priority. */
283 t = ns_get16(rdata);
284 rdata += NS_INT16SZ;
285 len = SPRINTF((tmp, "%u ", t));
286 T(addstr(tmp, len, &buf, &buflen));
287
288 /* Name1. */
289 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
290 T(addstr(" ", 1, &buf, &buflen));
291
292 /* Name2. */
293 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
294
295 break;
296 }
297
298 case ns_t_x25:
299 T(len = charstr(rdata, edata, &buf, &buflen));
300 if (len == 0)
301 goto formerr;
302 rdata += len;
303 break;
304
305 case ns_t_txt:
306 while (rdata < edata) {
307 T(len = charstr(rdata, edata, &buf, &buflen));
308 if (len == 0)
309 goto formerr;
310 rdata += len;
311 if (rdata < edata)
312 T(addstr(" ", 1, &buf, &buflen));
313 }
314 break;
315
316 case ns_t_nsap: {
317 char t[2+255*3];
318
319 (void) inet_nsap_ntoa(rdlen, rdata, t);
320 T(addstr(t, strlen(t), &buf, &buflen));
321 break;
322 }
323
324 case ns_t_aaaa:
325 if (rdlen != (size_t)NS_IN6ADDRSZ)
326 goto formerr;
327 (void) inet_ntop(AF_INET6, rdata, buf, buflen);
328 addlen(strlen(buf), &buf, &buflen);
329 break;
330
331 case ns_t_loc: {
332 char t[255];
333
334 /* XXX protocol format checking? */
335 (void) loc_ntoa(rdata, t);
336 T(addstr(t, strlen(t), &buf, &buflen));
337 break;
338 }
339
340 case ns_t_naptr: {
341 u_int order, preference;
342 char t[50];
343
344 if (rdlen < 2U*NS_INT16SZ)
345 goto formerr;
346
347 /* Order, Precedence. */
348 order = ns_get16(rdata); rdata += NS_INT16SZ;
349 preference = ns_get16(rdata); rdata += NS_INT16SZ;
350 len = SPRINTF((t, "%u %u ", order, preference));
351 T(addstr(t, len, &buf, &buflen));
352
353 /* Flags. */
354 T(len = charstr(rdata, edata, &buf, &buflen));
355 if (len == 0)
356 goto formerr;
357 rdata += len;
358 T(addstr(" ", 1, &buf, &buflen));
359
360 /* Service. */
361 T(len = charstr(rdata, edata, &buf, &buflen));
362 if (len == 0)
363 goto formerr;
364 rdata += len;
365 T(addstr(" ", 1, &buf, &buflen));
366
367 /* Regexp. */
368 T(len = charstr(rdata, edata, &buf, &buflen));
369 if (len < 0)
370 return (-1);
371 if (len == 0)
372 goto formerr;
373 rdata += len;
374 T(addstr(" ", 1, &buf, &buflen));
375
376 /* Server. */
377 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
378 break;
379 }
380
381 case ns_t_srv: {
382 u_int priority, weight, port;
383 char t[50];
384
385 if (rdlen < 3U*NS_INT16SZ)
386 goto formerr;
387
388 /* Priority, Weight, Port. */
389 priority = ns_get16(rdata); rdata += NS_INT16SZ;
390 weight = ns_get16(rdata); rdata += NS_INT16SZ;
391 port = ns_get16(rdata); rdata += NS_INT16SZ;
392 len = SPRINTF((t, "%u %u %u ", priority, weight, port));
393 T(addstr(t, len, &buf, &buflen));
394
395 /* Server. */
396 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
397 break;
398 }
399
400 case ns_t_minfo:
401 case ns_t_rp:
402 /* Name1. */
403 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
404 T(addstr(" ", 1, &buf, &buflen));
405
406 /* Name2. */
407 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
408
409 break;
410
411 case ns_t_wks: {
412 int n, lcnt;
413
414 if (rdlen < 1U + NS_INT32SZ)
415 goto formerr;
416
417 /* Address. */
418 (void) inet_ntop(AF_INET, rdata, buf, buflen);
419 addlen(strlen(buf), &buf, &buflen);
420 rdata += NS_INADDRSZ;
421
422 /* Protocol. */
423 len = SPRINTF((tmp, " %u ( ", *rdata));
424 T(addstr(tmp, len, &buf, &buflen));
425 rdata += NS_INT8SZ;
426
427 /* Bit map. */
428 n = 0;
429 lcnt = 0;
430 while (rdata < edata) {
431 u_int c = *rdata++;
432 do {
433 if (c & 0200) {
434 if (lcnt == 0) {
435 T(addstr("\n\t\t\t\t", 5,
436 &buf, &buflen));
437 lcnt = 10;
438 spaced = 0;
439 }
440 len = SPRINTF((tmp, "%d ", n));
441 T(addstr(tmp, len, &buf, &buflen));
442 lcnt--;
443 }
444 c <<= 1;
445 } while (++n & 07);
446 }
447 T(addstr(")", 1, &buf, &buflen));
448
449 break;
450 }
451
452 case ns_t_key: {
453 char base64_key[NS_MD5RSA_MAX_BASE64];
454 u_int keyflags, protocol, algorithm, key_id;
455 const char *leader;
456 int n;
457
458 if (rdlen < 0U + NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
459 goto formerr;
460
461 /* Key flags, Protocol, Algorithm. */
462 #ifndef _LIBC
463 key_id = dst_s_dns_key_id(rdata, edata-rdata);
464 #else
465 key_id = 0;
466 #endif
467 keyflags = ns_get16(rdata); rdata += NS_INT16SZ;
468 protocol = *rdata++;
469 algorithm = *rdata++;
470 len = SPRINTF((tmp, "0x%04x %u %u",
471 keyflags, protocol, algorithm));
472 T(addstr(tmp, len, &buf, &buflen));
473
474 /* Public key data. */
475 len = b64_ntop(rdata, edata - rdata,
476 base64_key, sizeof base64_key);
477 if (len < 0)
478 goto formerr;
479 if (len > 15) {
480 T(addstr(" (", 2, &buf, &buflen));
481 leader = "\n\t\t";
482 spaced = 0;
483 } else
484 leader = " ";
485 for (n = 0; n < len; n += 48) {
486 T(addstr(leader, strlen(leader), &buf, &buflen));
487 T(addstr(base64_key + n, MIN(len - n, 48),
488 &buf, &buflen));
489 }
490 if (len > 15)
491 T(addstr(" )", 2, &buf, &buflen));
492 n = SPRINTF((tmp, " ; key_tag= %u", key_id));
493 T(addstr(tmp, n, &buf, &buflen));
494
495 break;
496 }
497
498 case ns_t_sig: {
499 char base64_key[NS_MD5RSA_MAX_BASE64];
500 u_int type, algorithm, labels, footprint;
501 const char *leader;
502 u_long t;
503 int n;
504
505 if (rdlen < 22U)
506 goto formerr;
507
508 /* Type covered, Algorithm, Label count, Original TTL. */
509 type = ns_get16(rdata); rdata += NS_INT16SZ;
510 algorithm = *rdata++;
511 labels = *rdata++;
512 t = ns_get32(rdata); rdata += NS_INT32SZ;
513 len = SPRINTF((tmp, "%s %d %d %lu ",
514 p_type(type), algorithm, labels, t));
515 T(addstr(tmp, len, &buf, &buflen));
516 if (labels > (u_int)dn_count_labels(name))
517 goto formerr;
518
519 /* Signature expiry. */
520 t = ns_get32(rdata); rdata += NS_INT32SZ;
521 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
522 T(addstr(tmp, len, &buf, &buflen));
523
524 /* Time signed. */
525 t = ns_get32(rdata); rdata += NS_INT32SZ;
526 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
527 T(addstr(tmp, len, &buf, &buflen));
528
529 /* Signature Footprint. */
530 footprint = ns_get16(rdata); rdata += NS_INT16SZ;
531 len = SPRINTF((tmp, "%u ", footprint));
532 T(addstr(tmp, len, &buf, &buflen));
533
534 /* Signer's name. */
535 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
536
537 /* Signature. */
538 len = b64_ntop(rdata, edata - rdata,
539 base64_key, sizeof base64_key);
540 if (len > 15) {
541 T(addstr(" (", 2, &buf, &buflen));
542 leader = "\n\t\t";
543 spaced = 0;
544 } else
545 leader = " ";
546 if (len < 0)
547 goto formerr;
548 for (n = 0; n < len; n += 48) {
549 T(addstr(leader, strlen(leader), &buf, &buflen));
550 T(addstr(base64_key + n, MIN(len - n, 48),
551 &buf, &buflen));
552 }
553 if (len > 15)
554 T(addstr(" )", 2, &buf, &buflen));
555 break;
556 }
557
558 case ns_t_nxt: {
559 int n, c;
560
561 /* Next domain name. */
562 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
563
564 /* Type bit map. */
565 n = edata - rdata;
566 for (c = 0; c < n*8; c++)
567 if (NS_NXT_BIT_ISSET(c, rdata)) {
568 len = SPRINTF((tmp, " %s", p_type(c)));
569 T(addstr(tmp, len, &buf, &buflen));
570 }
571 break;
572 }
573
574 case ns_t_cert: {
575 u_int c_type, key_tag, alg;
576 int n;
577 unsigned int siz;
578 char base64_cert[8192], tmp[40];
579 const char *leader;
580
581 c_type = ns_get16(rdata); rdata += NS_INT16SZ;
582 key_tag = ns_get16(rdata); rdata += NS_INT16SZ;
583 alg = (u_int) *rdata++;
584
585 len = SPRINTF((tmp, "%d %d %d ", c_type, key_tag, alg));
586 T(addstr(tmp, len, &buf, &buflen));
587 siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
588 if (siz > sizeof(base64_cert) * 3/4) {
589 const char *str = "record too long to print";
590 T(addstr(str, strlen(str), &buf, &buflen));
591 }
592 else {
593 len = b64_ntop(rdata, edata-rdata, base64_cert, siz);
594
595 if (len < 0)
596 goto formerr;
597 else if (len > 15) {
598 T(addstr(" (", 2, &buf, &buflen));
599 leader = "\n\t\t";
600 spaced = 0;
601 }
602 else
603 leader = " ";
604
605 for (n = 0; n < len; n += 48) {
606 T(addstr(leader, strlen(leader),
607 &buf, &buflen));
608 T(addstr(base64_cert + n, MIN(len - n, 48),
609 &buf, &buflen));
610 }
611 if (len > 15)
612 T(addstr(" )", 2, &buf, &buflen));
613 }
614 break;
615 }
616
617 case ns_t_tkey: {
618 /* KJD - need to complete this */
619 u_long t;
620 int mode, err, keysize;
621
622 /* Algorithm name. */
623 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
624 T(addstr(" ", 1, &buf, &buflen));
625
626 /* Inception. */
627 t = ns_get32(rdata); rdata += NS_INT32SZ;
628 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
629 T(addstr(tmp, len, &buf, &buflen));
630
631 /* Experation. */
632 t = ns_get32(rdata); rdata += NS_INT32SZ;
633 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
634 T(addstr(tmp, len, &buf, &buflen));
635
636 /* Mode , Error, Key Size. */
637 /* Priority, Weight, Port. */
638 mode = ns_get16(rdata); rdata += NS_INT16SZ;
639 err = ns_get16(rdata); rdata += NS_INT16SZ;
640 keysize = ns_get16(rdata); rdata += NS_INT16SZ;
641 len = SPRINTF((tmp, "%u %u %u ", mode, err, keysize));
642 T(addstr(tmp, len, &buf, &buflen));
643
644 /* XXX need to dump key, print otherdata length & other data */
645 break;
646 }
647
648 case ns_t_tsig: {
649 /* BEW - need to complete this */
650 int n;
651
652 T(len = addname(msg, msglen, &rdata, origin, &buf, &buflen));
653 T(addstr(" ", 1, &buf, &buflen));
654 rdata += 8; /*%< time */
655 n = ns_get16(rdata); rdata += INT16SZ;
656 rdata += n; /*%< sig */
657 n = ns_get16(rdata); rdata += INT16SZ; /*%< original id */
658 sprintf(buf, "%d", ns_get16(rdata));
659 rdata += INT16SZ;
660 addlen(strlen(buf), &buf, &buflen);
661 break;
662 }
663
664 case ns_t_a6: {
665 struct in6_addr a;
666 int pbyte, pbit;
667
668 /* prefix length */
669 if (rdlen == 0U) goto formerr;
670 len = SPRINTF((tmp, "%d ", *rdata));
671 T(addstr(tmp, len, &buf, &buflen));
672 pbit = *rdata;
673 if (pbit > 128) goto formerr;
674 pbyte = (pbit & ~7) / 8;
675 rdata++;
676
677 /* address suffix: provided only when prefix len != 128 */
678 if (pbit < 128) {
679 if (rdata + pbyte >= edata) goto formerr;
680 memset(&a, 0, sizeof(a));
681 memcpy(&a.s6_addr[pbyte], rdata, sizeof(a) - pbyte);
682 (void) inet_ntop(AF_INET6, &a, buf, buflen);
683 addlen(strlen(buf), &buf, &buflen);
684 rdata += sizeof(a) - pbyte;
685 }
686
687 /* prefix name: provided only when prefix len > 0 */
688 if (pbit == 0)
689 break;
690 if (rdata >= edata) goto formerr;
691 T(addstr(" ", 1, &buf, &buflen));
692 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
693
694 break;
695 }
696
697 case ns_t_opt: {
698 len = SPRINTF((tmp, "%u bytes", class));
699 T(addstr(tmp, len, &buf, &buflen));
700 break;
701 }
702
703 default:
704 comment = "unknown RR type";
705 goto hexify;
706 }
707 return (buf - obuf);
708 formerr:
709 comment = "RR format error";
710 hexify: {
711 int n, m;
712 char *p;
713
714 len = SPRINTF((tmp, "\\# %u%s\t; %s", (unsigned)(edata - rdata),
715 rdlen != 0U ? " (" : "", comment));
716 T(addstr(tmp, len, &buf, &buflen));
717 while (rdata < edata) {
718 p = tmp;
719 p += SPRINTF((p, "\n\t"));
720 spaced = 0;
721 n = MIN(16, edata - rdata);
722 for (m = 0; m < n; m++)
723 p += SPRINTF((p, "%02x ", rdata[m]));
724 T(addstr(tmp, p - tmp, &buf, &buflen));
725 if (n < 16) {
726 T(addstr(")", 1, &buf, &buflen));
727 T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));
728 }
729 p = tmp;
730 p += SPRINTF((p, "; "));
731 for (m = 0; m < n; m++)
732 *p++ = (isascii(rdata[m]) && isprint(rdata[m]))
733 ? rdata[m]
734 : '.';
735 T(addstr(tmp, p - tmp, &buf, &buflen));
736 rdata += n;
737 }
738 return (buf - obuf);
739 }
740 }
741
742 /* Private. */
743
744 /*%
745 * size_t
746 * prune_origin(name, origin)
747 * Find out if the name is at or under the current origin.
748 * return:
749 * Number of characters in name before start of origin,
750 * or length of name if origin does not match.
751 * notes:
752 * This function should share code with samedomain().
753 */
754 static size_t
755 prune_origin(const char *name, const char *origin) {
756 const char *oname = name;
757
758 while (*name != '\0') {
759 if (origin != NULL && ns_samename(name, origin) == 1)
760 return (name - oname - (name > oname));
761 while (*name != '\0') {
762 if (*name == '\\') {
763 name++;
764 /* XXX need to handle \nnn form. */
765 if (*name == '\0')
766 break;
767 } else if (*name == '.') {
768 name++;
769 break;
770 }
771 name++;
772 }
773 }
774 return (name - oname);
775 }
776
777 /*%
778 * int
779 * charstr(rdata, edata, buf, buflen)
780 * Format a <character-string> into the presentation buffer.
781 * return:
782 * Number of rdata octets consumed
783 * 0 for protocol format error
784 * -1 for output buffer error
785 * side effects:
786 * buffer is advanced on success.
787 */
788 static int
789 charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
790 const u_char *odata = rdata;
791 size_t save_buflen = *buflen;
792 char *save_buf = *buf;
793
794 if (addstr("\"", 1, buf, buflen) < 0)
795 goto enospc;
796 if (rdata < edata) {
797 int n = *rdata;
798
799 if (rdata + 1 + n <= edata) {
800 rdata++;
801 while (n-- > 0) {
802 if (strchr("\n\"\\", *rdata) != NULL)
803 if (addstr("\\", 1, buf, buflen) < 0)
804 goto enospc;
805 if (addstr((const char *)rdata, 1,
806 buf, buflen) < 0)
807 goto enospc;
808 rdata++;
809 }
810 }
811 }
812 if (addstr("\"", 1, buf, buflen) < 0)
813 goto enospc;
814 return (rdata - odata);
815 enospc:
816 errno = ENOSPC;
817 *buf = save_buf;
818 *buflen = save_buflen;
819 return (-1);
820 }
821
822 static int
823 addname(const u_char *msg, size_t msglen,
824 const u_char **pp, const char *origin,
825 char **buf, size_t *buflen)
826 {
827 size_t newlen, save_buflen = *buflen;
828 char *save_buf = *buf;
829 int n;
830
831 n = dn_expand(msg, msg + msglen, *pp, *buf, *buflen);
832 if (n < 0)
833 goto enospc; /*%< Guess. */
834 newlen = prune_origin(*buf, origin);
835 if (**buf == '\0') {
836 goto root;
837 } else if (newlen == 0U) {
838 /* Use "@" instead of name. */
839 if (newlen + 2 > *buflen)
840 goto enospc; /* No room for "@\0". */
841 (*buf)[newlen++] = '@';
842 (*buf)[newlen] = '\0';
843 } else {
844 if (((origin == NULL || origin[0] == '\0') ||
845 (origin[0] != '.' && origin[1] != '\0' &&
846 (*buf)[newlen] == '\0')) && (*buf)[newlen - 1] != '.') {
847 /* No trailing dot. */
848 root:
849 if (newlen + 2 > *buflen)
850 goto enospc; /* No room for ".\0". */
851 (*buf)[newlen++] = '.';
852 (*buf)[newlen] = '\0';
853 }
854 }
855 *pp += n;
856 addlen(newlen, buf, buflen);
857 **buf = '\0';
858 return (newlen);
859 enospc:
860 errno = ENOSPC;
861 *buf = save_buf;
862 *buflen = save_buflen;
863 return (-1);
864 }
865
866 static void
867 addlen(size_t len, char **buf, size_t *buflen) {
868 INSIST(len <= *buflen);
869 *buf += len;
870 *buflen -= len;
871 }
872
873 static int
874 addstr(const char *src, size_t len, char **buf, size_t *buflen) {
875 if (len >= *buflen) {
876 errno = ENOSPC;
877 return (-1);
878 }
879 memcpy(*buf, src, len);
880 addlen(len, buf, buflen);
881 **buf = '\0';
882 return (0);
883 }
884
885 static int
886 addtab(size_t len, size_t target, int spaced, char **buf, size_t *buflen) {
887 size_t save_buflen = *buflen;
888 char *save_buf = *buf;
889 int t;
890
891 if (spaced || len >= target - 1) {
892 T(addstr(" ", 2, buf, buflen));
893 spaced = 1;
894 } else {
895 for (t = (target - len - 1) / 8; t >= 0; t--)
896 if (addstr("\t", 1, buf, buflen) < 0) {
897 *buflen = save_buflen;
898 *buf = save_buf;
899 return (-1);
900 }
901 spaced = 0;
902 }
903 return (spaced);
904 }
905
906 /*! \file */
DragonFly BSD