1 /*
2 * Copyright (C) 2004, 2005, 2007-2009, 2011-2015 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2001, 2003 Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or 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 WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /* $Id$ */
19
20 /* Reviewed: Thu Mar 16 16:52:50 PST 2000 by bwelling */
21
22 /* RFC2915 */
23
24 #ifndef RDATA_GENERIC_NAPTR_35_C
25 #define RDATA_GENERIC_NAPTR_35_C
26
27 #define RRTYPE_NAPTR_ATTRIBUTES (0)
28
29 #include <isc/regex.h>
30
31 /*
32 * Check the wire format of the Regexp field.
33 * Don't allow embeded NUL's.
34 */
35 static inline isc_result_t
txt_valid_regex(const unsigned char * txt)36 txt_valid_regex(const unsigned char *txt) {
37 unsigned int nsub = 0;
38 char regex[256];
39 char *cp;
40 isc_boolean_t flags = ISC_FALSE;
41 isc_boolean_t replace = ISC_FALSE;
42 unsigned char c;
43 unsigned char delim;
44 unsigned int len;
45 int n;
46
47 len = *txt++;
48 if (len == 0U)
49 return (ISC_R_SUCCESS);
50
51 delim = *txt++;
52 len--;
53
54 /*
55 * Digits, backslash and flags can't be delimiters.
56 */
57 switch (delim) {
58 case '0': case '1': case '2': case '3': case '4':
59 case '5': case '6': case '7': case '8': case '9':
60 case '\\': case 'i': case 0:
61 return (DNS_R_SYNTAX);
62 }
63
64 cp = regex;
65 while (len-- > 0) {
66 c = *txt++;
67 if (c == 0)
68 return (DNS_R_SYNTAX);
69 if (c == delim && !replace) {
70 replace = ISC_TRUE;
71 continue;
72 } else if (c == delim && !flags) {
73 flags = ISC_TRUE;
74 continue;
75 } else if (c == delim)
76 return (DNS_R_SYNTAX);
77 /*
78 * Flags are not escaped.
79 */
80 if (flags) {
81 switch (c) {
82 case 'i':
83 continue;
84 default:
85 return (DNS_R_SYNTAX);
86 }
87 }
88 if (!replace)
89 *cp++ = c;
90 if (c == '\\') {
91 if (len == 0)
92 return (DNS_R_SYNTAX);
93 c = *txt++;
94 if (c == 0)
95 return (DNS_R_SYNTAX);
96 len--;
97 if (replace)
98 switch (c) {
99 case '0': return (DNS_R_SYNTAX);
100 case '1': if (nsub < 1) nsub = 1; break;
101 case '2': if (nsub < 2) nsub = 2; break;
102 case '3': if (nsub < 3) nsub = 3; break;
103 case '4': if (nsub < 4) nsub = 4; break;
104 case '5': if (nsub < 5) nsub = 5; break;
105 case '6': if (nsub < 6) nsub = 6; break;
106 case '7': if (nsub < 7) nsub = 7; break;
107 case '8': if (nsub < 8) nsub = 8; break;
108 case '9': if (nsub < 9) nsub = 9; break;
109 }
110 if (!replace)
111 *cp++ = c;
112 }
113 }
114 if (!flags)
115 return (DNS_R_SYNTAX);
116 *cp = '\0';
117 n = isc_regex_validate(regex);
118 if (n < 0 || nsub > (unsigned int)n)
119 return (DNS_R_SYNTAX);
120 return (ISC_R_SUCCESS);
121 }
122
123 static inline isc_result_t
fromtext_naptr(ARGS_FROMTEXT)124 fromtext_naptr(ARGS_FROMTEXT) {
125 isc_token_t token;
126 dns_name_t name;
127 isc_buffer_t buffer;
128 unsigned char *regex;
129
130 REQUIRE(type == dns_rdatatype_naptr);
131
132 UNUSED(type);
133 UNUSED(rdclass);
134 UNUSED(callbacks);
135
136 /*
137 * Order.
138 */
139 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
140 ISC_FALSE));
141 if (token.value.as_ulong > 0xffffU)
142 RETTOK(ISC_R_RANGE);
143 RETERR(uint16_tobuffer(token.value.as_ulong, target));
144
145 /*
146 * Preference.
147 */
148 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
149 ISC_FALSE));
150 if (token.value.as_ulong > 0xffffU)
151 RETTOK(ISC_R_RANGE);
152 RETERR(uint16_tobuffer(token.value.as_ulong, target));
153
154 /*
155 * Flags.
156 */
157 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
158 ISC_FALSE));
159 RETTOK(txt_fromtext(&token.value.as_textregion, target));
160
161 /*
162 * Service.
163 */
164 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
165 ISC_FALSE));
166 RETTOK(txt_fromtext(&token.value.as_textregion, target));
167
168 /*
169 * Regexp.
170 */
171 regex = isc_buffer_used(target);
172 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
173 ISC_FALSE));
174 RETTOK(txt_fromtext(&token.value.as_textregion, target));
175 RETTOK(txt_valid_regex(regex));
176
177 /*
178 * Replacement.
179 */
180 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
181 ISC_FALSE));
182 dns_name_init(&name, NULL);
183 buffer_fromregion(&buffer, &token.value.as_region);
184 if (origin == NULL)
185 origin = dns_rootname;
186 RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
187 return (ISC_R_SUCCESS);
188 }
189
190 static inline isc_result_t
totext_naptr(ARGS_TOTEXT)191 totext_naptr(ARGS_TOTEXT) {
192 isc_region_t region;
193 dns_name_t name;
194 dns_name_t prefix;
195 isc_boolean_t sub;
196 char buf[sizeof("64000")];
197 unsigned short num;
198
199 REQUIRE(rdata->type == dns_rdatatype_naptr);
200 REQUIRE(rdata->length != 0);
201
202 dns_name_init(&name, NULL);
203 dns_name_init(&prefix, NULL);
204
205 dns_rdata_toregion(rdata, ®ion);
206
207 /*
208 * Order.
209 */
210 num = uint16_fromregion(®ion);
211 isc_region_consume(®ion, 2);
212 sprintf(buf, "%u", num);
213 RETERR(str_totext(buf, target));
214 RETERR(str_totext(" ", target));
215
216 /*
217 * Preference.
218 */
219 num = uint16_fromregion(®ion);
220 isc_region_consume(®ion, 2);
221 sprintf(buf, "%u", num);
222 RETERR(str_totext(buf, target));
223 RETERR(str_totext(" ", target));
224
225 /*
226 * Flags.
227 */
228 RETERR(txt_totext(®ion, ISC_TRUE, target));
229 RETERR(str_totext(" ", target));
230
231 /*
232 * Service.
233 */
234 RETERR(txt_totext(®ion, ISC_TRUE, target));
235 RETERR(str_totext(" ", target));
236
237 /*
238 * Regexp.
239 */
240 RETERR(txt_totext(®ion, ISC_TRUE, target));
241 RETERR(str_totext(" ", target));
242
243 /*
244 * Replacement.
245 */
246 dns_name_fromregion(&name, ®ion);
247 sub = name_prefix(&name, tctx->origin, &prefix);
248 return (dns_name_totext(&prefix, sub, target));
249 }
250
251 static inline isc_result_t
fromwire_naptr(ARGS_FROMWIRE)252 fromwire_naptr(ARGS_FROMWIRE) {
253 dns_name_t name;
254 isc_region_t sr;
255 unsigned char *regex;
256
257 REQUIRE(type == dns_rdatatype_naptr);
258
259 UNUSED(type);
260 UNUSED(rdclass);
261
262 dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
263
264 dns_name_init(&name, NULL);
265
266 /*
267 * Order, preference.
268 */
269 isc_buffer_activeregion(source, &sr);
270 if (sr.length < 4)
271 return (ISC_R_UNEXPECTEDEND);
272 RETERR(mem_tobuffer(target, sr.base, 4));
273 isc_buffer_forward(source, 4);
274
275 /*
276 * Flags.
277 */
278 RETERR(txt_fromwire(source, target));
279
280 /*
281 * Service.
282 */
283 RETERR(txt_fromwire(source, target));
284
285 /*
286 * Regexp.
287 */
288 regex = isc_buffer_used(target);
289 RETERR(txt_fromwire(source, target));
290 RETERR(txt_valid_regex(regex));
291
292 /*
293 * Replacement.
294 */
295 return (dns_name_fromwire(&name, source, dctx, options, target));
296 }
297
298 static inline isc_result_t
towire_naptr(ARGS_TOWIRE)299 towire_naptr(ARGS_TOWIRE) {
300 dns_name_t name;
301 dns_offsets_t offsets;
302 isc_region_t sr;
303
304 REQUIRE(rdata->type == dns_rdatatype_naptr);
305 REQUIRE(rdata->length != 0);
306
307 dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
308 /*
309 * Order, preference.
310 */
311 dns_rdata_toregion(rdata, &sr);
312 RETERR(mem_tobuffer(target, sr.base, 4));
313 isc_region_consume(&sr, 4);
314
315 /*
316 * Flags.
317 */
318 RETERR(mem_tobuffer(target, sr.base, sr.base[0] + 1));
319 isc_region_consume(&sr, sr.base[0] + 1);
320
321 /*
322 * Service.
323 */
324 RETERR(mem_tobuffer(target, sr.base, sr.base[0] + 1));
325 isc_region_consume(&sr, sr.base[0] + 1);
326
327 /*
328 * Regexp.
329 */
330 RETERR(mem_tobuffer(target, sr.base, sr.base[0] + 1));
331 isc_region_consume(&sr, sr.base[0] + 1);
332
333 /*
334 * Replacement.
335 */
336 dns_name_init(&name, offsets);
337 dns_name_fromregion(&name, &sr);
338 return (dns_name_towire(&name, cctx, target));
339 }
340
341 static inline int
compare_naptr(ARGS_COMPARE)342 compare_naptr(ARGS_COMPARE) {
343 dns_name_t name1;
344 dns_name_t name2;
345 isc_region_t region1;
346 isc_region_t region2;
347 int order, len;
348
349 REQUIRE(rdata1->type == rdata2->type);
350 REQUIRE(rdata1->rdclass == rdata2->rdclass);
351 REQUIRE(rdata1->type == dns_rdatatype_naptr);
352 REQUIRE(rdata1->length != 0);
353 REQUIRE(rdata2->length != 0);
354
355 dns_rdata_toregion(rdata1, ®ion1);
356 dns_rdata_toregion(rdata2, ®ion2);
357
358 /*
359 * Order, preference.
360 */
361 order = memcmp(region1.base, region2.base, 4);
362 if (order != 0)
363 return (order < 0 ? -1 : 1);
364 isc_region_consume(®ion1, 4);
365 isc_region_consume(®ion2, 4);
366
367 /*
368 * Flags.
369 */
370 len = ISC_MIN(region1.base[0], region2.base[0]);
371 order = memcmp(region1.base, region2.base, len + 1);
372 if (order != 0)
373 return (order < 0 ? -1 : 1);
374 isc_region_consume(®ion1, region1.base[0] + 1);
375 isc_region_consume(®ion2, region2.base[0] + 1);
376
377 /*
378 * Service.
379 */
380 len = ISC_MIN(region1.base[0], region2.base[0]);
381 order = memcmp(region1.base, region2.base, len + 1);
382 if (order != 0)
383 return (order < 0 ? -1 : 1);
384 isc_region_consume(®ion1, region1.base[0] + 1);
385 isc_region_consume(®ion2, region2.base[0] + 1);
386
387 /*
388 * Regexp.
389 */
390 len = ISC_MIN(region1.base[0], region2.base[0]);
391 order = memcmp(region1.base, region2.base, len + 1);
392 if (order != 0)
393 return (order < 0 ? -1 : 1);
394 isc_region_consume(®ion1, region1.base[0] + 1);
395 isc_region_consume(®ion2, region2.base[0] + 1);
396
397 /*
398 * Replacement.
399 */
400 dns_name_init(&name1, NULL);
401 dns_name_init(&name2, NULL);
402
403 dns_name_fromregion(&name1, ®ion1);
404 dns_name_fromregion(&name2, ®ion2);
405
406 return (dns_name_rdatacompare(&name1, &name2));
407 }
408
409 static inline isc_result_t
fromstruct_naptr(ARGS_FROMSTRUCT)410 fromstruct_naptr(ARGS_FROMSTRUCT) {
411 dns_rdata_naptr_t *naptr = source;
412 isc_region_t region;
413
414 REQUIRE(type == dns_rdatatype_naptr);
415 REQUIRE(source != NULL);
416 REQUIRE(naptr->common.rdtype == type);
417 REQUIRE(naptr->common.rdclass == rdclass);
418 REQUIRE(naptr->flags != NULL || naptr->flags_len == 0);
419 REQUIRE(naptr->service != NULL || naptr->service_len == 0);
420 REQUIRE(naptr->regexp != NULL || naptr->regexp_len == 0);
421
422 UNUSED(type);
423 UNUSED(rdclass);
424
425 RETERR(uint16_tobuffer(naptr->order, target));
426 RETERR(uint16_tobuffer(naptr->preference, target));
427 RETERR(uint8_tobuffer(naptr->flags_len, target));
428 RETERR(mem_tobuffer(target, naptr->flags, naptr->flags_len));
429 RETERR(uint8_tobuffer(naptr->service_len, target));
430 RETERR(mem_tobuffer(target, naptr->service, naptr->service_len));
431 RETERR(uint8_tobuffer(naptr->regexp_len, target));
432 RETERR(mem_tobuffer(target, naptr->regexp, naptr->regexp_len));
433 dns_name_toregion(&naptr->replacement, ®ion);
434 return (isc_buffer_copyregion(target, ®ion));
435 }
436
437 static inline isc_result_t
tostruct_naptr(ARGS_TOSTRUCT)438 tostruct_naptr(ARGS_TOSTRUCT) {
439 dns_rdata_naptr_t *naptr = target;
440 isc_region_t r;
441 isc_result_t result;
442 dns_name_t name;
443
444 REQUIRE(rdata->type == dns_rdatatype_naptr);
445 REQUIRE(target != NULL);
446 REQUIRE(rdata->length != 0);
447
448 naptr->common.rdclass = rdata->rdclass;
449 naptr->common.rdtype = rdata->type;
450 ISC_LINK_INIT(&naptr->common, link);
451
452 naptr->flags = NULL;
453 naptr->service = NULL;
454 naptr->regexp = NULL;
455
456 dns_rdata_toregion(rdata, &r);
457
458 naptr->order = uint16_fromregion(&r);
459 isc_region_consume(&r, 2);
460
461 naptr->preference = uint16_fromregion(&r);
462 isc_region_consume(&r, 2);
463
464 naptr->flags_len = uint8_fromregion(&r);
465 isc_region_consume(&r, 1);
466 INSIST(naptr->flags_len <= r.length);
467 naptr->flags = mem_maybedup(mctx, r.base, naptr->flags_len);
468 if (naptr->flags == NULL)
469 goto cleanup;
470 isc_region_consume(&r, naptr->flags_len);
471
472 naptr->service_len = uint8_fromregion(&r);
473 isc_region_consume(&r, 1);
474 INSIST(naptr->service_len <= r.length);
475 naptr->service = mem_maybedup(mctx, r.base, naptr->service_len);
476 if (naptr->service == NULL)
477 goto cleanup;
478 isc_region_consume(&r, naptr->service_len);
479
480 naptr->regexp_len = uint8_fromregion(&r);
481 isc_region_consume(&r, 1);
482 INSIST(naptr->regexp_len <= r.length);
483 naptr->regexp = mem_maybedup(mctx, r.base, naptr->regexp_len);
484 if (naptr->regexp == NULL)
485 goto cleanup;
486 isc_region_consume(&r, naptr->regexp_len);
487
488 dns_name_init(&name, NULL);
489 dns_name_fromregion(&name, &r);
490 dns_name_init(&naptr->replacement, NULL);
491 result = name_duporclone(&name, mctx, &naptr->replacement);
492 if (result != ISC_R_SUCCESS)
493 goto cleanup;
494 naptr->mctx = mctx;
495 return (ISC_R_SUCCESS);
496
497 cleanup:
498 if (mctx != NULL && naptr->flags != NULL)
499 isc_mem_free(mctx, naptr->flags);
500 if (mctx != NULL && naptr->service != NULL)
501 isc_mem_free(mctx, naptr->service);
502 if (mctx != NULL && naptr->regexp != NULL)
503 isc_mem_free(mctx, naptr->regexp);
504 return (ISC_R_NOMEMORY);
505 }
506
507 static inline void
freestruct_naptr(ARGS_FREESTRUCT)508 freestruct_naptr(ARGS_FREESTRUCT) {
509 dns_rdata_naptr_t *naptr = source;
510
511 REQUIRE(source != NULL);
512 REQUIRE(naptr->common.rdtype == dns_rdatatype_naptr);
513
514 if (naptr->mctx == NULL)
515 return;
516
517 if (naptr->flags != NULL)
518 isc_mem_free(naptr->mctx, naptr->flags);
519 if (naptr->service != NULL)
520 isc_mem_free(naptr->mctx, naptr->service);
521 if (naptr->regexp != NULL)
522 isc_mem_free(naptr->mctx, naptr->regexp);
523 dns_name_free(&naptr->replacement, naptr->mctx);
524 naptr->mctx = NULL;
525 }
526
527 static inline isc_result_t
additionaldata_naptr(ARGS_ADDLDATA)528 additionaldata_naptr(ARGS_ADDLDATA) {
529 dns_name_t name;
530 dns_offsets_t offsets;
531 isc_region_t sr;
532 dns_rdatatype_t atype;
533 unsigned int i, flagslen;
534 char *cp;
535
536 REQUIRE(rdata->type == dns_rdatatype_naptr);
537
538 /*
539 * Order, preference.
540 */
541 dns_rdata_toregion(rdata, &sr);
542 isc_region_consume(&sr, 4);
543
544 /*
545 * Flags.
546 */
547 atype = 0;
548 flagslen = sr.base[0];
549 cp = (char *)&sr.base[1];
550 for (i = 0; i < flagslen; i++, cp++) {
551 if (*cp == 'S' || *cp == 's') {
552 atype = dns_rdatatype_srv;
553 break;
554 }
555 if (*cp == 'A' || *cp == 'a') {
556 atype = dns_rdatatype_a;
557 break;
558 }
559 }
560 isc_region_consume(&sr, flagslen + 1);
561
562 /*
563 * Service.
564 */
565 isc_region_consume(&sr, sr.base[0] + 1);
566
567 /*
568 * Regexp.
569 */
570 isc_region_consume(&sr, sr.base[0] + 1);
571
572 /*
573 * Replacement.
574 */
575 dns_name_init(&name, offsets);
576 dns_name_fromregion(&name, &sr);
577
578 if (atype != 0)
579 return ((add)(arg, &name, atype));
580
581 return (ISC_R_SUCCESS);
582 }
583
584 static inline isc_result_t
digest_naptr(ARGS_DIGEST)585 digest_naptr(ARGS_DIGEST) {
586 isc_region_t r1, r2;
587 unsigned int length, n;
588 isc_result_t result;
589 dns_name_t name;
590
591 REQUIRE(rdata->type == dns_rdatatype_naptr);
592
593 dns_rdata_toregion(rdata, &r1);
594 r2 = r1;
595 length = 0;
596
597 /*
598 * Order, preference.
599 */
600 length += 4;
601 isc_region_consume(&r2, 4);
602
603 /*
604 * Flags.
605 */
606 n = r2.base[0] + 1;
607 length += n;
608 isc_region_consume(&r2, n);
609
610 /*
611 * Service.
612 */
613 n = r2.base[0] + 1;
614 length += n;
615 isc_region_consume(&r2, n);
616
617 /*
618 * Regexp.
619 */
620 n = r2.base[0] + 1;
621 length += n;
622 isc_region_consume(&r2, n);
623
624 /*
625 * Digest the RR up to the replacement name.
626 */
627 r1.length = length;
628 result = (digest)(arg, &r1);
629 if (result != ISC_R_SUCCESS)
630 return (result);
631
632 /*
633 * Replacement.
634 */
635
636 dns_name_init(&name, NULL);
637 dns_name_fromregion(&name, &r2);
638
639 return (dns_name_digest(&name, digest, arg));
640 }
641
642 static inline isc_boolean_t
checkowner_naptr(ARGS_CHECKOWNER)643 checkowner_naptr(ARGS_CHECKOWNER) {
644
645 REQUIRE(type == dns_rdatatype_naptr);
646
647 UNUSED(name);
648 UNUSED(type);
649 UNUSED(rdclass);
650 UNUSED(wildcard);
651
652 return (ISC_TRUE);
653 }
654
655 static inline isc_boolean_t
checknames_naptr(ARGS_CHECKNAMES)656 checknames_naptr(ARGS_CHECKNAMES) {
657
658 REQUIRE(rdata->type == dns_rdatatype_naptr);
659
660 UNUSED(rdata);
661 UNUSED(owner);
662 UNUSED(bad);
663
664 return (ISC_TRUE);
665 }
666
667 static inline int
casecompare_naptr(ARGS_COMPARE)668 casecompare_naptr(ARGS_COMPARE) {
669 return (compare_naptr(rdata1, rdata2));
670 }
671
672 #endif /* RDATA_GENERIC_NAPTR_35_C */
673