1 /*
2 * Copyright (C) 2004-2015 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1998-2003 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 /*! \file */
21
22 #include <config.h>
23 #include <ctype.h>
24
25 #include <isc/base64.h>
26 #include <isc/hex.h>
27 #include <isc/lex.h>
28 #include <isc/mem.h>
29 #include <isc/parseint.h>
30 #include <isc/print.h>
31 #include <isc/string.h>
32 #include <isc/stdlib.h>
33 #include <isc/util.h>
34
35 #include <dns/callbacks.h>
36 #include <dns/cert.h>
37 #include <dns/compress.h>
38 #include <dns/enumtype.h>
39 #include <dns/keyflags.h>
40 #include <dns/keyvalues.h>
41 #include <dns/message.h>
42 #include <dns/rcode.h>
43 #include <dns/rdata.h>
44 #include <dns/rdataclass.h>
45 #include <dns/rdatastruct.h>
46 #include <dns/rdatatype.h>
47 #include <dns/result.h>
48 #include <dns/secalg.h>
49 #include <dns/secproto.h>
50 #include <dns/time.h>
51 #include <dns/ttl.h>
52
53 #define RETERR(x) \
54 do { \
55 isc_result_t _r = (x); \
56 if (_r != ISC_R_SUCCESS) \
57 return (_r); \
58 } while (0)
59
60 #define RETTOK(x) \
61 do { \
62 isc_result_t _r = (x); \
63 if (_r != ISC_R_SUCCESS) { \
64 isc_lex_ungettoken(lexer, &token); \
65 return (_r); \
66 } \
67 } while (0)
68
69 #define DNS_AS_STR(t) ((t).value.as_textregion.base)
70
71 #define ARGS_FROMTEXT int rdclass, dns_rdatatype_t type, \
72 isc_lex_t *lexer, dns_name_t *origin, \
73 unsigned int options, isc_buffer_t *target, \
74 dns_rdatacallbacks_t *callbacks
75
76 #define ARGS_TOTEXT dns_rdata_t *rdata, dns_rdata_textctx_t *tctx, \
77 isc_buffer_t *target
78
79 #define ARGS_FROMWIRE int rdclass, dns_rdatatype_t type, \
80 isc_buffer_t *source, dns_decompress_t *dctx, \
81 unsigned int options, isc_buffer_t *target
82
83 #define ARGS_TOWIRE dns_rdata_t *rdata, dns_compress_t *cctx, \
84 isc_buffer_t *target
85
86 #define ARGS_COMPARE const dns_rdata_t *rdata1, const dns_rdata_t *rdata2
87
88 #define ARGS_FROMSTRUCT int rdclass, dns_rdatatype_t type, \
89 void *source, isc_buffer_t *target
90
91 #define ARGS_TOSTRUCT dns_rdata_t *rdata, void *target, isc_mem_t *mctx
92
93 #define ARGS_FREESTRUCT void *source
94
95 #define ARGS_ADDLDATA dns_rdata_t *rdata, dns_additionaldatafunc_t add, \
96 void *arg
97
98 #define ARGS_DIGEST dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg
99
100 #define ARGS_CHECKOWNER dns_name_t *name, dns_rdataclass_t rdclass, \
101 dns_rdatatype_t type, isc_boolean_t wildcard
102
103 #define ARGS_CHECKNAMES dns_rdata_t *rdata, dns_name_t *owner, dns_name_t *bad
104
105
106 /*%
107 * Context structure for the totext_ functions.
108 * Contains formatting options for rdata-to-text
109 * conversion.
110 */
111 typedef struct dns_rdata_textctx {
112 dns_name_t *origin; /*%< Current origin, or NULL. */
113 unsigned int flags; /*%< DNS_STYLEFLAG_* */
114 unsigned int width; /*%< Width of rdata column. */
115 const char *linebreak; /*%< Line break string. */
116 } dns_rdata_textctx_t;
117
118 static isc_result_t
119 txt_totext(isc_region_t *source, isc_boolean_t quote, isc_buffer_t *target);
120
121 static isc_result_t
122 txt_fromtext(isc_textregion_t *source, isc_buffer_t *target);
123
124 static isc_result_t
125 txt_fromwire(isc_buffer_t *source, isc_buffer_t *target);
126
127 static isc_result_t
128 multitxt_totext(isc_region_t *source, isc_buffer_t *target);
129
130 static isc_result_t
131 multitxt_fromtext(isc_textregion_t *source, isc_buffer_t *target);
132
133 static isc_boolean_t
134 name_prefix(dns_name_t *name, dns_name_t *origin, dns_name_t *target);
135
136 static unsigned int
137 name_length(dns_name_t *name);
138
139 static isc_result_t
140 str_totext(const char *source, isc_buffer_t *target);
141
142 static isc_result_t
143 inet_totext(int af, isc_region_t *src, isc_buffer_t *target);
144
145 static isc_boolean_t
146 buffer_empty(isc_buffer_t *source);
147
148 static void
149 buffer_fromregion(isc_buffer_t *buffer, isc_region_t *region);
150
151 static isc_result_t
152 uint32_tobuffer(isc_uint32_t, isc_buffer_t *target);
153
154 static isc_result_t
155 uint16_tobuffer(isc_uint32_t, isc_buffer_t *target);
156
157 static isc_result_t
158 uint8_tobuffer(isc_uint32_t, isc_buffer_t *target);
159
160 static isc_result_t
161 name_tobuffer(dns_name_t *name, isc_buffer_t *target);
162
163 static isc_uint32_t
164 uint32_fromregion(isc_region_t *region);
165
166 static isc_uint16_t
167 uint16_fromregion(isc_region_t *region);
168
169 static isc_uint8_t
170 uint8_fromregion(isc_region_t *region);
171
172 static isc_uint8_t
173 uint8_consume_fromregion(isc_region_t *region);
174
175 static isc_result_t
176 mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);
177
178 static int
179 hexvalue(char value);
180
181 static int
182 decvalue(char value);
183
184 static isc_result_t
185 btoa_totext(unsigned char *inbuf, int inbuflen, isc_buffer_t *target);
186
187 static isc_result_t
188 atob_tobuffer(isc_lex_t *lexer, isc_buffer_t *target);
189
190 static void
191 default_fromtext_callback(dns_rdatacallbacks_t *callbacks, const char *, ...)
192 ISC_FORMAT_PRINTF(2, 3);
193
194 static void
195 fromtext_error(void (*callback)(dns_rdatacallbacks_t *, const char *, ...),
196 dns_rdatacallbacks_t *callbacks, const char *name,
197 unsigned long line, isc_token_t *token, isc_result_t result);
198
199 static void
200 fromtext_warneof(isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks);
201
202 static isc_result_t
203 rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
204 isc_buffer_t *target);
205
206 static void
207 warn_badname(dns_name_t *name, isc_lex_t *lexer,
208 dns_rdatacallbacks_t *callbacks);
209
210 static void
211 warn_badmx(isc_token_t *token, isc_lex_t *lexer,
212 dns_rdatacallbacks_t *callbacks);
213
214 static isc_uint16_t
215 uint16_consume_fromregion(isc_region_t *region);
216
217 static isc_result_t
218 unknown_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
219 isc_buffer_t *target);
220
221 static inline isc_result_t
222 generic_fromtext_key(ARGS_FROMTEXT);
223
224 static inline isc_result_t
225 generic_totext_key(ARGS_TOTEXT);
226
227 static inline isc_result_t
228 generic_fromwire_key(ARGS_FROMWIRE);
229
230 static inline isc_result_t
231 generic_fromstruct_key(ARGS_FROMSTRUCT);
232
233 static inline isc_result_t
234 generic_tostruct_key(ARGS_TOSTRUCT);
235
236 static inline void
237 generic_freestruct_key(ARGS_FREESTRUCT);
238
239 static isc_result_t
240 generic_fromtext_txt(ARGS_FROMTEXT);
241
242 static isc_result_t
243 generic_totext_txt(ARGS_TOTEXT);
244
245 static isc_result_t
246 generic_fromwire_txt(ARGS_FROMWIRE);
247
248 static isc_result_t
249 generic_fromstruct_txt(ARGS_FROMSTRUCT);
250
251 static isc_result_t
252 generic_tostruct_txt(ARGS_TOSTRUCT);
253
254 static void
255 generic_freestruct_txt(ARGS_FREESTRUCT);
256
257 static isc_result_t
258 generic_txt_first(dns_rdata_txt_t *txt);
259
260 static isc_result_t
261 generic_txt_next(dns_rdata_txt_t *txt);
262
263 static isc_result_t
264 generic_txt_current(dns_rdata_txt_t *txt, dns_rdata_txt_string_t *string);
265
266 static isc_result_t
267 generic_totext_ds(ARGS_TOTEXT);
268
269 static isc_result_t
270 generic_tostruct_ds(ARGS_TOSTRUCT);
271
272 static isc_result_t
273 generic_fromtext_ds(ARGS_FROMTEXT);
274
275 static isc_result_t
276 generic_fromwire_ds(ARGS_FROMWIRE);
277
278 static isc_result_t
279 generic_fromstruct_ds(ARGS_FROMSTRUCT);
280
281 static isc_result_t
282 generic_fromtext_tlsa(ARGS_FROMTEXT);
283
284 static isc_result_t
285 generic_totext_tlsa(ARGS_TOTEXT);
286
287 static isc_result_t
288 generic_fromwire_tlsa(ARGS_FROMWIRE);
289
290 static isc_result_t
291 generic_fromstruct_tlsa(ARGS_FROMSTRUCT);
292
293 static isc_result_t
294 generic_tostruct_tlsa(ARGS_TOSTRUCT);
295
296 static void
297 generic_freestruct_tlsa(ARGS_FREESTRUCT);
298
299 /*% INT16 Size */
300 #define NS_INT16SZ 2
301 /*% IPv6 Address Size */
302 #define NS_LOCATORSZ 8
303
304 /*
305 * Active Diretory gc._msdcs.<forest> prefix.
306 */
307 static unsigned char gc_msdcs_data[] = "\002gc\006_msdcs";
308 static unsigned char gc_msdcs_offset [] = { 0, 3 };
309
310 static const dns_name_t gc_msdcs = {
311 DNS_NAME_MAGIC,
312 gc_msdcs_data, 10, 2,
313 DNS_NAMEATTR_READONLY,
314 gc_msdcs_offset, NULL,
315 {(void *)-1, (void *)-1},
316 {NULL, NULL}
317 };
318
319 /*%
320 * convert presentation level address to network order binary form.
321 * \return
322 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
323 * \note
324 * (1) does not touch `dst' unless it's returning 1.
325 */
326 static inline int
locator_pton(const char * src,unsigned char * dst)327 locator_pton(const char *src, unsigned char *dst) {
328 static const char xdigits_l[] = "0123456789abcdef",
329 xdigits_u[] = "0123456789ABCDEF";
330 unsigned char tmp[NS_LOCATORSZ];
331 unsigned char *tp = tmp, *endp;
332 const char *xdigits;
333 int ch, seen_xdigits;
334 unsigned int val;
335
336 memset(tp, '\0', NS_LOCATORSZ);
337 endp = tp + NS_LOCATORSZ;
338 seen_xdigits = 0;
339 val = 0;
340 while ((ch = *src++) != '\0') {
341 const char *pch;
342
343 pch = strchr((xdigits = xdigits_l), ch);
344 if (pch == NULL)
345 pch = strchr((xdigits = xdigits_u), ch);
346 if (pch != NULL) {
347 val <<= 4;
348 val |= (pch - xdigits);
349 if (++seen_xdigits > 4)
350 return (0);
351 continue;
352 }
353 if (ch == ':') {
354 if (!seen_xdigits)
355 return (0);
356 if (tp + NS_INT16SZ > endp)
357 return (0);
358 *tp++ = (unsigned char) (val >> 8) & 0xff;
359 *tp++ = (unsigned char) val & 0xff;
360 seen_xdigits = 0;
361 val = 0;
362 continue;
363 }
364 return (0);
365 }
366 if (seen_xdigits) {
367 if (tp + NS_INT16SZ > endp)
368 return (0);
369 *tp++ = (unsigned char) (val >> 8) & 0xff;
370 *tp++ = (unsigned char) val & 0xff;
371 }
372 if (tp != endp)
373 return (0);
374 memmove(dst, tmp, NS_LOCATORSZ);
375 return (1);
376 }
377
378 static inline int
getquad(const void * src,struct in_addr * dst,isc_lex_t * lexer,dns_rdatacallbacks_t * callbacks)379 getquad(const void *src, struct in_addr *dst,
380 isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks)
381 {
382 int result;
383 struct in_addr *tmp;
384
385 result = inet_aton(src, dst);
386 if (result == 1 && callbacks != NULL &&
387 inet_pton(AF_INET, src, &tmp) != 1) {
388 const char *name = isc_lex_getsourcename(lexer);
389 if (name == NULL)
390 name = "UNKNOWN";
391 (*callbacks->warn)(callbacks, "%s:%lu: \"%s\" "
392 "is not a decimal dotted quad", name,
393 isc_lex_getsourceline(lexer), src);
394 }
395 return (result);
396 }
397
398 static inline isc_result_t
name_duporclone(dns_name_t * source,isc_mem_t * mctx,dns_name_t * target)399 name_duporclone(dns_name_t *source, isc_mem_t *mctx, dns_name_t *target) {
400
401 if (mctx != NULL)
402 return (dns_name_dup(source, mctx, target));
403 dns_name_clone(source, target);
404 return (ISC_R_SUCCESS);
405 }
406
407 static inline void *
mem_maybedup(isc_mem_t * mctx,void * source,size_t length)408 mem_maybedup(isc_mem_t *mctx, void *source, size_t length) {
409 void *copy;
410
411 if (mctx == NULL)
412 return (source);
413 copy = isc_mem_allocate(mctx, length);
414 if (copy != NULL)
415 memmove(copy, source, length);
416
417 return (copy);
418 }
419
420 static inline isc_result_t
typemap_fromtext(isc_lex_t * lexer,isc_buffer_t * target,isc_boolean_t allow_empty)421 typemap_fromtext(isc_lex_t *lexer, isc_buffer_t *target,
422 isc_boolean_t allow_empty)
423 {
424 isc_token_t token;
425 unsigned char bm[8*1024]; /* 64k bits */
426 dns_rdatatype_t covered, max_used;
427 int octet;
428 unsigned int max_octet, newend, end;
429 int window;
430 isc_boolean_t first = ISC_TRUE;
431
432 max_used = 0;
433 bm[0] = 0;
434 end = 0;
435
436 do {
437 RETERR(isc_lex_getmastertoken(lexer, &token,
438 isc_tokentype_string, ISC_TRUE));
439 if (token.type != isc_tokentype_string)
440 break;
441 RETTOK(dns_rdatatype_fromtext(&covered,
442 &token.value.as_textregion));
443 if (covered > max_used) {
444 newend = covered / 8;
445 if (newend > end) {
446 memset(&bm[end + 1], 0, newend - end);
447 end = newend;
448 }
449 max_used = covered;
450 }
451 bm[covered/8] |= (0x80>>(covered%8));
452 first = ISC_FALSE;
453 } while (1);
454 isc_lex_ungettoken(lexer, &token);
455 if (!allow_empty && first)
456 return (DNS_R_FORMERR);
457
458 for (window = 0; window < 256 ; window++) {
459 if (max_used < window * 256)
460 break;
461
462 max_octet = max_used - (window * 256);
463 if (max_octet >= 256)
464 max_octet = 31;
465 else
466 max_octet /= 8;
467
468 /*
469 * Find if we have a type in this window.
470 */
471 for (octet = max_octet; octet >= 0; octet--) {
472 if (bm[window * 32 + octet] != 0)
473 break;
474 }
475 if (octet < 0)
476 continue;
477 RETERR(uint8_tobuffer(window, target));
478 RETERR(uint8_tobuffer(octet + 1, target));
479 RETERR(mem_tobuffer(target, &bm[window * 32], octet + 1));
480 }
481 return (ISC_R_SUCCESS);
482 }
483
484 static inline isc_result_t
typemap_totext(isc_region_t * sr,dns_rdata_textctx_t * tctx,isc_buffer_t * target)485 typemap_totext(isc_region_t *sr, dns_rdata_textctx_t *tctx,
486 isc_buffer_t *target)
487 {
488 unsigned int i, j, k;
489 unsigned int window, len;
490 isc_boolean_t first = ISC_FALSE;
491
492 for (i = 0; i < sr->length; i += len) {
493 if (tctx != NULL &&
494 (tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) {
495 RETERR(str_totext(tctx->linebreak, target));
496 first = ISC_TRUE;
497 }
498 INSIST(i + 2 <= sr->length);
499 window = sr->base[i];
500 len = sr->base[i + 1];
501 INSIST(len > 0 && len <= 32);
502 i += 2;
503 INSIST(i + len <= sr->length);
504 for (j = 0; j < len; j++) {
505 dns_rdatatype_t t;
506 if (sr->base[i + j] == 0)
507 continue;
508 for (k = 0; k < 8; k++) {
509 if ((sr->base[i + j] & (0x80 >> k)) == 0)
510 continue;
511 t = window * 256 + j * 8 + k;
512 if (!first)
513 RETERR(str_totext(" ", target));
514 first = ISC_FALSE;
515 if (dns_rdatatype_isknown(t)) {
516 RETERR(dns_rdatatype_totext(t, target));
517 } else {
518 char buf[sizeof("TYPE65535")];
519 sprintf(buf, "TYPE%u", t);
520 RETERR(str_totext(buf, target));
521 }
522 }
523 }
524 }
525 return (ISC_R_SUCCESS);
526 }
527
528 static isc_result_t
typemap_test(isc_region_t * sr,isc_boolean_t allow_empty)529 typemap_test(isc_region_t *sr, isc_boolean_t allow_empty) {
530 unsigned int window, lastwindow = 0;
531 unsigned int len;
532 isc_boolean_t first = ISC_TRUE;
533 unsigned int i;
534
535 for (i = 0; i < sr->length; i += len) {
536 /*
537 * Check for overflow.
538 */
539 if (i + 2 > sr->length)
540 RETERR(DNS_R_FORMERR);
541 window = sr->base[i];
542 len = sr->base[i + 1];
543 i += 2;
544 /*
545 * Check that bitmap windows are in the correct order.
546 */
547 if (!first && window <= lastwindow)
548 RETERR(DNS_R_FORMERR);
549 /*
550 * Check for legal lengths.
551 */
552 if (len < 1 || len > 32)
553 RETERR(DNS_R_FORMERR);
554 /*
555 * Check for overflow.
556 */
557 if (i + len > sr->length)
558 RETERR(DNS_R_FORMERR);
559 /*
560 * The last octet of the bitmap must be non zero.
561 */
562 if (sr->base[i + len - 1] == 0)
563 RETERR(DNS_R_FORMERR);
564 lastwindow = window;
565 first = ISC_FALSE;
566 }
567 if (i != sr->length)
568 return (DNS_R_EXTRADATA);
569 if (!allow_empty && first)
570 RETERR(DNS_R_FORMERR);
571 return (ISC_R_SUCCESS);
572 }
573
574 static const char hexdigits[] = "0123456789abcdef";
575 static const char decdigits[] = "0123456789";
576
577 #include "code.h"
578
579 #define META 0x0001
580 #define RESERVED 0x0002
581
582 /***
583 *** Initialization
584 ***/
585
586 void
dns_rdata_init(dns_rdata_t * rdata)587 dns_rdata_init(dns_rdata_t *rdata) {
588
589 REQUIRE(rdata != NULL);
590
591 rdata->data = NULL;
592 rdata->length = 0;
593 rdata->rdclass = 0;
594 rdata->type = 0;
595 rdata->flags = 0;
596 ISC_LINK_INIT(rdata, link);
597 /* ISC_LIST_INIT(rdata->list); */
598 }
599
600 void
dns_rdata_reset(dns_rdata_t * rdata)601 dns_rdata_reset(dns_rdata_t *rdata) {
602
603 REQUIRE(rdata != NULL);
604
605 REQUIRE(!ISC_LINK_LINKED(rdata, link));
606 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
607
608 rdata->data = NULL;
609 rdata->length = 0;
610 rdata->rdclass = 0;
611 rdata->type = 0;
612 rdata->flags = 0;
613 }
614
615 /***
616 ***
617 ***/
618
619 void
dns_rdata_clone(const dns_rdata_t * src,dns_rdata_t * target)620 dns_rdata_clone(const dns_rdata_t *src, dns_rdata_t *target) {
621
622 REQUIRE(src != NULL);
623 REQUIRE(target != NULL);
624
625 REQUIRE(DNS_RDATA_INITIALIZED(target));
626
627 REQUIRE(DNS_RDATA_VALIDFLAGS(src));
628 REQUIRE(DNS_RDATA_VALIDFLAGS(target));
629
630 target->data = src->data;
631 target->length = src->length;
632 target->rdclass = src->rdclass;
633 target->type = src->type;
634 target->flags = src->flags;
635 }
636
637
638 /***
639 *** Comparisons
640 ***/
641
642 int
dns_rdata_compare(const dns_rdata_t * rdata1,const dns_rdata_t * rdata2)643 dns_rdata_compare(const dns_rdata_t *rdata1, const dns_rdata_t *rdata2) {
644 int result = 0;
645 isc_boolean_t use_default = ISC_FALSE;
646
647 REQUIRE(rdata1 != NULL);
648 REQUIRE(rdata2 != NULL);
649 REQUIRE(rdata1->length == 0 || rdata1->data != NULL);
650 REQUIRE(rdata2->length == 0 || rdata2->data != NULL);
651 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata1));
652 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata2));
653
654 if (rdata1->rdclass != rdata2->rdclass)
655 return (rdata1->rdclass < rdata2->rdclass ? -1 : 1);
656
657 if (rdata1->type != rdata2->type)
658 return (rdata1->type < rdata2->type ? -1 : 1);
659
660 COMPARESWITCH
661
662 if (use_default) {
663 isc_region_t r1;
664 isc_region_t r2;
665
666 dns_rdata_toregion(rdata1, &r1);
667 dns_rdata_toregion(rdata2, &r2);
668 result = isc_region_compare(&r1, &r2);
669 }
670 return (result);
671 }
672
673 int
dns_rdata_casecompare(const dns_rdata_t * rdata1,const dns_rdata_t * rdata2)674 dns_rdata_casecompare(const dns_rdata_t *rdata1, const dns_rdata_t *rdata2) {
675 int result = 0;
676 isc_boolean_t use_default = ISC_FALSE;
677
678 REQUIRE(rdata1 != NULL);
679 REQUIRE(rdata2 != NULL);
680 REQUIRE(rdata1->length == 0 || rdata1->data != NULL);
681 REQUIRE(rdata2->length == 0 || rdata2->data != NULL);
682 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata1));
683 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata2));
684
685 if (rdata1->rdclass != rdata2->rdclass)
686 return (rdata1->rdclass < rdata2->rdclass ? -1 : 1);
687
688 if (rdata1->type != rdata2->type)
689 return (rdata1->type < rdata2->type ? -1 : 1);
690
691 CASECOMPARESWITCH
692
693 if (use_default) {
694 isc_region_t r1;
695 isc_region_t r2;
696
697 dns_rdata_toregion(rdata1, &r1);
698 dns_rdata_toregion(rdata2, &r2);
699 result = isc_region_compare(&r1, &r2);
700 }
701 return (result);
702 }
703
704 /***
705 *** Conversions
706 ***/
707
708 void
dns_rdata_fromregion(dns_rdata_t * rdata,dns_rdataclass_t rdclass,dns_rdatatype_t type,isc_region_t * r)709 dns_rdata_fromregion(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
710 dns_rdatatype_t type, isc_region_t *r)
711 {
712
713 REQUIRE(rdata != NULL);
714 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
715 REQUIRE(r != NULL);
716
717 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
718
719 rdata->data = r->base;
720 rdata->length = r->length;
721 rdata->rdclass = rdclass;
722 rdata->type = type;
723 rdata->flags = 0;
724 }
725
726 void
dns_rdata_toregion(const dns_rdata_t * rdata,isc_region_t * r)727 dns_rdata_toregion(const dns_rdata_t *rdata, isc_region_t *r) {
728
729 REQUIRE(rdata != NULL);
730 REQUIRE(r != NULL);
731 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
732
733 r->base = rdata->data;
734 r->length = rdata->length;
735 }
736
737 isc_result_t
dns_rdata_fromwire(dns_rdata_t * rdata,dns_rdataclass_t rdclass,dns_rdatatype_t type,isc_buffer_t * source,dns_decompress_t * dctx,unsigned int options,isc_buffer_t * target)738 dns_rdata_fromwire(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
739 dns_rdatatype_t type, isc_buffer_t *source,
740 dns_decompress_t *dctx, unsigned int options,
741 isc_buffer_t *target)
742 {
743 isc_result_t result = ISC_R_NOTIMPLEMENTED;
744 isc_region_t region;
745 isc_buffer_t ss;
746 isc_buffer_t st;
747 isc_boolean_t use_default = ISC_FALSE;
748 isc_uint32_t activelength;
749 unsigned int length;
750
751 REQUIRE(dctx != NULL);
752 if (rdata != NULL) {
753 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
754 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
755 }
756 REQUIRE(source != NULL);
757 REQUIRE(target != NULL);
758
759 if (type == 0)
760 return (DNS_R_FORMERR);
761
762 ss = *source;
763 st = *target;
764
765 activelength = isc_buffer_activelength(source);
766 INSIST(activelength < 65536);
767
768 FROMWIRESWITCH
769
770 if (use_default) {
771 if (activelength > isc_buffer_availablelength(target))
772 result = ISC_R_NOSPACE;
773 else {
774 isc_buffer_putmem(target, isc_buffer_current(source),
775 activelength);
776 isc_buffer_forward(source, activelength);
777 result = ISC_R_SUCCESS;
778 }
779 }
780
781 /*
782 * Reject any rdata that expands out to more than DNS_RDATA_MAXLENGTH
783 * as we cannot transmit it.
784 */
785 length = isc_buffer_usedlength(target) - isc_buffer_usedlength(&st);
786 if (result == ISC_R_SUCCESS && length > DNS_RDATA_MAXLENGTH)
787 result = DNS_R_FORMERR;
788
789 /*
790 * We should have consumed all of our buffer.
791 */
792 if (result == ISC_R_SUCCESS && !buffer_empty(source))
793 result = DNS_R_EXTRADATA;
794
795 if (rdata != NULL && result == ISC_R_SUCCESS) {
796 region.base = isc_buffer_used(&st);
797 region.length = length;
798 dns_rdata_fromregion(rdata, rdclass, type, ®ion);
799 }
800
801 if (result != ISC_R_SUCCESS) {
802 *source = ss;
803 *target = st;
804 }
805 return (result);
806 }
807
808 isc_result_t
dns_rdata_towire(dns_rdata_t * rdata,dns_compress_t * cctx,isc_buffer_t * target)809 dns_rdata_towire(dns_rdata_t *rdata, dns_compress_t *cctx,
810 isc_buffer_t *target)
811 {
812 isc_result_t result = ISC_R_NOTIMPLEMENTED;
813 isc_boolean_t use_default = ISC_FALSE;
814 isc_region_t tr;
815 isc_buffer_t st;
816
817 REQUIRE(rdata != NULL);
818 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
819
820 /*
821 * Some DynDNS meta-RRs have empty rdata.
822 */
823 if ((rdata->flags & DNS_RDATA_UPDATE) != 0) {
824 INSIST(rdata->length == 0);
825 return (ISC_R_SUCCESS);
826 }
827
828 st = *target;
829
830 TOWIRESWITCH
831
832 if (use_default) {
833 isc_buffer_availableregion(target, &tr);
834 if (tr.length < rdata->length)
835 return (ISC_R_NOSPACE);
836 memmove(tr.base, rdata->data, rdata->length);
837 isc_buffer_add(target, rdata->length);
838 return (ISC_R_SUCCESS);
839 }
840 if (result != ISC_R_SUCCESS) {
841 *target = st;
842 INSIST(target->used < 65536);
843 dns_compress_rollback(cctx, (isc_uint16_t)target->used);
844 }
845 return (result);
846 }
847
848 /*
849 * If the binary data in 'src' is valid uncompressed wire format
850 * rdata of class 'rdclass' and type 'type', return ISC_R_SUCCESS
851 * and copy the validated rdata to 'dest'. Otherwise return an error.
852 */
853 static isc_result_t
rdata_validate(isc_buffer_t * src,isc_buffer_t * dest,dns_rdataclass_t rdclass,dns_rdatatype_t type)854 rdata_validate(isc_buffer_t *src, isc_buffer_t *dest, dns_rdataclass_t rdclass,
855 dns_rdatatype_t type)
856 {
857 dns_decompress_t dctx;
858 isc_result_t result;
859
860 dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_NONE);
861 isc_buffer_setactive(src, isc_buffer_usedlength(src));
862 result = dns_rdata_fromwire(NULL, rdclass, type, src, &dctx, 0, dest);
863 dns_decompress_invalidate(&dctx);
864
865 return (result);
866 }
867
868 static isc_result_t
unknown_fromtext(dns_rdataclass_t rdclass,dns_rdatatype_t type,isc_lex_t * lexer,isc_mem_t * mctx,isc_buffer_t * target)869 unknown_fromtext(dns_rdataclass_t rdclass, dns_rdatatype_t type,
870 isc_lex_t *lexer, isc_mem_t *mctx, isc_buffer_t *target)
871 {
872 isc_result_t result;
873 isc_buffer_t *buf = NULL;
874 isc_token_t token;
875
876 if (type == 0 || dns_rdatatype_ismeta(type))
877 return (DNS_R_METATYPE);
878
879 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
880 ISC_FALSE));
881 if (token.value.as_ulong > 65535U)
882 return (ISC_R_RANGE);
883 result = isc_buffer_allocate(mctx, &buf, token.value.as_ulong);
884 if (result != ISC_R_SUCCESS)
885 return (result);
886
887 result = isc_hex_tobuffer(lexer, buf,
888 (unsigned int)token.value.as_ulong);
889 if (result != ISC_R_SUCCESS)
890 goto failure;
891 if (isc_buffer_usedlength(buf) != token.value.as_ulong) {
892 result = ISC_R_UNEXPECTEDEND;
893 goto failure;
894 }
895
896 if (dns_rdatatype_isknown(type)) {
897 result = rdata_validate(buf, target, rdclass, type);
898 } else {
899 isc_region_t r;
900 isc_buffer_usedregion(buf, &r);
901 result = isc_buffer_copyregion(target, &r);
902 }
903 if (result != ISC_R_SUCCESS)
904 goto failure;
905
906 isc_buffer_free(&buf);
907 return (ISC_R_SUCCESS);
908
909 failure:
910 isc_buffer_free(&buf);
911 return (result);
912 }
913
914 isc_result_t
dns_rdata_fromtext(dns_rdata_t * rdata,dns_rdataclass_t rdclass,dns_rdatatype_t type,isc_lex_t * lexer,dns_name_t * origin,unsigned int options,isc_mem_t * mctx,isc_buffer_t * target,dns_rdatacallbacks_t * callbacks)915 dns_rdata_fromtext(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
916 dns_rdatatype_t type, isc_lex_t *lexer,
917 dns_name_t *origin, unsigned int options, isc_mem_t *mctx,
918 isc_buffer_t *target, dns_rdatacallbacks_t *callbacks)
919 {
920 isc_result_t result = ISC_R_NOTIMPLEMENTED;
921 isc_region_t region;
922 isc_buffer_t st;
923 isc_token_t token;
924 unsigned int lexoptions = ISC_LEXOPT_EOL | ISC_LEXOPT_EOF |
925 ISC_LEXOPT_DNSMULTILINE | ISC_LEXOPT_ESCAPE;
926 char *name;
927 unsigned long line;
928 void (*callback)(dns_rdatacallbacks_t *, const char *, ...);
929 isc_result_t tresult;
930 unsigned int length;
931 isc_boolean_t unknown;
932
933 REQUIRE(origin == NULL || dns_name_isabsolute(origin) == ISC_TRUE);
934 if (rdata != NULL) {
935 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
936 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
937 }
938 if (callbacks != NULL) {
939 REQUIRE(callbacks->warn != NULL);
940 REQUIRE(callbacks->error != NULL);
941 }
942
943 st = *target;
944
945 if (callbacks != NULL)
946 callback = callbacks->error;
947 else
948 callback = default_fromtext_callback;
949
950 result = isc_lex_getmastertoken(lexer, &token, isc_tokentype_qstring,
951 ISC_FALSE);
952 if (result != ISC_R_SUCCESS) {
953 name = isc_lex_getsourcename(lexer);
954 line = isc_lex_getsourceline(lexer);
955 fromtext_error(callback, callbacks, name, line, NULL, result);
956 return (result);
957 }
958
959 unknown = ISC_FALSE;
960 if (token.type == isc_tokentype_string &&
961 strcmp(DNS_AS_STR(token), "\\#") == 0) {
962 /*
963 * If this is a TXT record '\#' could be a escaped '#'.
964 * Look to see if the next token is a number and if so
965 * treat it as a unknown record format.
966 */
967 if (type == dns_rdatatype_txt) {
968 result = isc_lex_getmastertoken(lexer, &token,
969 isc_tokentype_number,
970 ISC_FALSE);
971 if (result == ISC_R_SUCCESS)
972 isc_lex_ungettoken(lexer, &token);
973 }
974
975 if (result == ISC_R_SUCCESS) {
976 unknown = ISC_TRUE;
977 result = unknown_fromtext(rdclass, type, lexer,
978 mctx, target);
979 } else
980 options |= DNS_RDATA_UNKNOWNESCAPE;
981 } else
982 isc_lex_ungettoken(lexer, &token);
983
984 if (!unknown)
985 FROMTEXTSWITCH
986
987 /*
988 * Consume to end of line / file.
989 * If not at end of line initially set error code.
990 * Call callback via fromtext_error once if there was an error.
991 */
992 do {
993 name = isc_lex_getsourcename(lexer);
994 line = isc_lex_getsourceline(lexer);
995 tresult = isc_lex_gettoken(lexer, lexoptions, &token);
996 if (tresult != ISC_R_SUCCESS) {
997 if (result == ISC_R_SUCCESS)
998 result = tresult;
999 if (callback != NULL)
1000 fromtext_error(callback, callbacks, name,
1001 line, NULL, result);
1002 break;
1003 } else if (token.type != isc_tokentype_eol &&
1004 token.type != isc_tokentype_eof) {
1005 if (result == ISC_R_SUCCESS)
1006 result = DNS_R_EXTRATOKEN;
1007 if (callback != NULL) {
1008 fromtext_error(callback, callbacks, name,
1009 line, &token, result);
1010 callback = NULL;
1011 }
1012 } else if (result != ISC_R_SUCCESS && callback != NULL) {
1013 fromtext_error(callback, callbacks, name, line,
1014 &token, result);
1015 break;
1016 } else {
1017 if (token.type == isc_tokentype_eof)
1018 fromtext_warneof(lexer, callbacks);
1019 break;
1020 }
1021 } while (1);
1022
1023 length = isc_buffer_usedlength(target) - isc_buffer_usedlength(&st);
1024 if (result == ISC_R_SUCCESS && length > DNS_RDATA_MAXLENGTH)
1025 result = ISC_R_NOSPACE;
1026
1027 if (rdata != NULL && result == ISC_R_SUCCESS) {
1028 region.base = isc_buffer_used(&st);
1029 region.length = length;
1030 dns_rdata_fromregion(rdata, rdclass, type, ®ion);
1031 }
1032 if (result != ISC_R_SUCCESS) {
1033 *target = st;
1034 }
1035 return (result);
1036 }
1037
1038 static isc_result_t
unknown_totext(dns_rdata_t * rdata,dns_rdata_textctx_t * tctx,isc_buffer_t * target)1039 unknown_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
1040 isc_buffer_t *target)
1041 {
1042 isc_result_t result;
1043 char buf[sizeof("65535")];
1044 isc_region_t sr;
1045
1046 strlcpy(buf, "\\# ", sizeof(buf));
1047 result = str_totext(buf, target);
1048 if (result != ISC_R_SUCCESS)
1049 return (result);
1050
1051 dns_rdata_toregion(rdata, &sr);
1052 INSIST(sr.length < 65536);
1053 snprintf(buf, sizeof(buf), "%u", sr.length);
1054 result = str_totext(buf, target);
1055 if (result != ISC_R_SUCCESS)
1056 return (result);
1057
1058 if (sr.length != 0U) {
1059 if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
1060 result = str_totext(" ( ", target);
1061 else
1062 result = str_totext(" ", target);
1063
1064 if (result != ISC_R_SUCCESS)
1065 return (result);
1066
1067 if (tctx->width == 0) /* No splitting */
1068 result = isc_hex_totext(&sr, 0, "", target);
1069 else
1070 result = isc_hex_totext(&sr, tctx->width - 2,
1071 tctx->linebreak,
1072 target);
1073 if (result == ISC_R_SUCCESS &&
1074 (tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
1075 result = str_totext(" )", target);
1076 }
1077 return (result);
1078 }
1079
1080 static isc_result_t
rdata_totext(dns_rdata_t * rdata,dns_rdata_textctx_t * tctx,isc_buffer_t * target)1081 rdata_totext(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
1082 isc_buffer_t *target)
1083 {
1084 isc_result_t result = ISC_R_NOTIMPLEMENTED;
1085 isc_boolean_t use_default = ISC_FALSE;
1086 unsigned int cur;
1087
1088 REQUIRE(rdata != NULL);
1089 REQUIRE(tctx->origin == NULL ||
1090 dns_name_isabsolute(tctx->origin) == ISC_TRUE);
1091
1092 /*
1093 * Some DynDNS meta-RRs have empty rdata.
1094 */
1095 if ((rdata->flags & DNS_RDATA_UPDATE) != 0) {
1096 INSIST(rdata->length == 0);
1097 return (ISC_R_SUCCESS);
1098 }
1099
1100 cur = isc_buffer_usedlength(target);
1101
1102 TOTEXTSWITCH
1103
1104 if (use_default || (result == ISC_R_NOTIMPLEMENTED)) {
1105 unsigned int u = isc_buffer_usedlength(target);
1106
1107 INSIST(u >= cur);
1108 isc_buffer_subtract(target, u - cur);
1109 result = unknown_totext(rdata, tctx, target);
1110 }
1111
1112 return (result);
1113 }
1114
1115 isc_result_t
dns_rdata_totext(dns_rdata_t * rdata,dns_name_t * origin,isc_buffer_t * target)1116 dns_rdata_totext(dns_rdata_t *rdata, dns_name_t *origin, isc_buffer_t *target)
1117 {
1118 dns_rdata_textctx_t tctx;
1119
1120 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1121
1122 /*
1123 * Set up formatting options for single-line output.
1124 */
1125 tctx.origin = origin;
1126 tctx.flags = 0;
1127 tctx.width = 60;
1128 tctx.linebreak = " ";
1129 return (rdata_totext(rdata, &tctx, target));
1130 }
1131
1132 isc_result_t
dns_rdata_tofmttext(dns_rdata_t * rdata,dns_name_t * origin,unsigned int flags,unsigned int width,unsigned int split_width,const char * linebreak,isc_buffer_t * target)1133 dns_rdata_tofmttext(dns_rdata_t *rdata, dns_name_t *origin,
1134 unsigned int flags, unsigned int width,
1135 unsigned int split_width, const char *linebreak,
1136 isc_buffer_t *target)
1137 {
1138 dns_rdata_textctx_t tctx;
1139
1140 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1141
1142 /*
1143 * Set up formatting options for formatted output.
1144 */
1145 tctx.origin = origin;
1146 tctx.flags = flags;
1147 if (split_width == 0xffffffff)
1148 tctx.width = width;
1149 else
1150 tctx.width = split_width;
1151
1152 if ((flags & DNS_STYLEFLAG_MULTILINE) != 0)
1153 tctx.linebreak = linebreak;
1154 else {
1155 if (split_width == 0xffffffff)
1156 tctx.width = 60; /* Used for hex word length only. */
1157 tctx.linebreak = " ";
1158 }
1159 return (rdata_totext(rdata, &tctx, target));
1160 }
1161
1162 isc_result_t
dns_rdata_fromstruct(dns_rdata_t * rdata,dns_rdataclass_t rdclass,dns_rdatatype_t type,void * source,isc_buffer_t * target)1163 dns_rdata_fromstruct(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
1164 dns_rdatatype_t type, void *source,
1165 isc_buffer_t *target)
1166 {
1167 isc_result_t result = ISC_R_NOTIMPLEMENTED;
1168 isc_buffer_t st;
1169 isc_region_t region;
1170 isc_boolean_t use_default = ISC_FALSE;
1171 unsigned int length;
1172
1173 REQUIRE(source != NULL);
1174 if (rdata != NULL) {
1175 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
1176 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1177 }
1178
1179 st = *target;
1180
1181 FROMSTRUCTSWITCH
1182
1183 if (use_default)
1184 (void)NULL;
1185
1186 length = isc_buffer_usedlength(target) - isc_buffer_usedlength(&st);
1187 if (result == ISC_R_SUCCESS && length > DNS_RDATA_MAXLENGTH)
1188 result = ISC_R_NOSPACE;
1189
1190 if (rdata != NULL && result == ISC_R_SUCCESS) {
1191 region.base = isc_buffer_used(&st);
1192 region.length = length;
1193 dns_rdata_fromregion(rdata, rdclass, type, ®ion);
1194 }
1195 if (result != ISC_R_SUCCESS)
1196 *target = st;
1197 return (result);
1198 }
1199
1200 isc_result_t
dns_rdata_tostruct(dns_rdata_t * rdata,void * target,isc_mem_t * mctx)1201 dns_rdata_tostruct(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {
1202 isc_result_t result = ISC_R_NOTIMPLEMENTED;
1203 isc_boolean_t use_default = ISC_FALSE;
1204
1205 REQUIRE(rdata != NULL);
1206 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1207
1208 TOSTRUCTSWITCH
1209
1210 if (use_default)
1211 (void)NULL;
1212
1213 return (result);
1214 }
1215
1216 void
dns_rdata_freestruct(void * source)1217 dns_rdata_freestruct(void *source) {
1218 dns_rdatacommon_t *common = source;
1219 REQUIRE(source != NULL);
1220
1221 FREESTRUCTSWITCH
1222 }
1223
1224 isc_result_t
dns_rdata_additionaldata(dns_rdata_t * rdata,dns_additionaldatafunc_t add,void * arg)1225 dns_rdata_additionaldata(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
1226 void *arg)
1227 {
1228 isc_result_t result = ISC_R_NOTIMPLEMENTED;
1229 isc_boolean_t use_default = ISC_FALSE;
1230
1231 /*
1232 * Call 'add' for each name and type from 'rdata' which is subject to
1233 * additional section processing.
1234 */
1235
1236 REQUIRE(rdata != NULL);
1237 REQUIRE(add != NULL);
1238 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1239
1240 ADDITIONALDATASWITCH
1241
1242 /* No additional processing for unknown types */
1243 if (use_default)
1244 result = ISC_R_SUCCESS;
1245
1246 return (result);
1247 }
1248
1249 isc_result_t
dns_rdata_digest(dns_rdata_t * rdata,dns_digestfunc_t digest,void * arg)1250 dns_rdata_digest(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg) {
1251 isc_result_t result = ISC_R_NOTIMPLEMENTED;
1252 isc_boolean_t use_default = ISC_FALSE;
1253 isc_region_t r;
1254
1255 /*
1256 * Send 'rdata' in DNSSEC canonical form to 'digest'.
1257 */
1258
1259 REQUIRE(rdata != NULL);
1260 REQUIRE(digest != NULL);
1261 REQUIRE(DNS_RDATA_VALIDFLAGS(rdata));
1262
1263 DIGESTSWITCH
1264
1265 if (use_default) {
1266 dns_rdata_toregion(rdata, &r);
1267 result = (digest)(arg, &r);
1268 }
1269
1270 return (result);
1271 }
1272
1273 isc_boolean_t
dns_rdata_checkowner(dns_name_t * name,dns_rdataclass_t rdclass,dns_rdatatype_t type,isc_boolean_t wildcard)1274 dns_rdata_checkowner(dns_name_t *name, dns_rdataclass_t rdclass,
1275 dns_rdatatype_t type, isc_boolean_t wildcard)
1276 {
1277 isc_boolean_t result;
1278
1279 CHECKOWNERSWITCH
1280 return (result);
1281 }
1282
1283 isc_boolean_t
dns_rdata_checknames(dns_rdata_t * rdata,dns_name_t * owner,dns_name_t * bad)1284 dns_rdata_checknames(dns_rdata_t *rdata, dns_name_t *owner, dns_name_t *bad)
1285 {
1286 isc_boolean_t result;
1287
1288 CHECKNAMESSWITCH
1289 return (result);
1290 }
1291
1292 unsigned int
dns_rdatatype_attributes(dns_rdatatype_t type)1293 dns_rdatatype_attributes(dns_rdatatype_t type)
1294 {
1295 RDATATYPE_ATTRIBUTE_SW
1296 if (type >= (dns_rdatatype_t)128 && type < (dns_rdatatype_t)255)
1297 return (DNS_RDATATYPEATTR_UNKNOWN | DNS_RDATATYPEATTR_META);
1298 return (DNS_RDATATYPEATTR_UNKNOWN);
1299 }
1300
1301 isc_result_t
dns_rdatatype_fromtext(dns_rdatatype_t * typep,isc_textregion_t * source)1302 dns_rdatatype_fromtext(dns_rdatatype_t *typep, isc_textregion_t *source) {
1303 unsigned int hash;
1304 unsigned int n;
1305 unsigned char a, b;
1306
1307 n = source->length;
1308
1309 if (n == 0)
1310 return (DNS_R_UNKNOWN);
1311
1312 a = tolower((unsigned char)source->base[0]);
1313 b = tolower((unsigned char)source->base[n - 1]);
1314
1315 hash = ((a + n) * b) % 256;
1316
1317 /*
1318 * This switch block is inlined via \#define, and will use "return"
1319 * to return a result to the caller if it is a valid (known)
1320 * rdatatype name.
1321 */
1322 RDATATYPE_FROMTEXT_SW(hash, source->base, n, typep);
1323
1324 if (source->length > 4 && source->length < (4 + sizeof("65000")) &&
1325 strncasecmp("type", source->base, 4) == 0) {
1326 char buf[sizeof("65000")];
1327 char *endp;
1328 unsigned int val;
1329
1330 strncpy(buf, source->base + 4, source->length - 4);
1331 buf[source->length - 4] = '\0';
1332 val = strtoul(buf, &endp, 10);
1333 if (*endp == '\0' && val <= 0xffff) {
1334 *typep = (dns_rdatatype_t)val;
1335 return (ISC_R_SUCCESS);
1336 }
1337 }
1338
1339 return (DNS_R_UNKNOWN);
1340 }
1341
1342 isc_result_t
dns_rdatatype_totext(dns_rdatatype_t type,isc_buffer_t * target)1343 dns_rdatatype_totext(dns_rdatatype_t type, isc_buffer_t *target) {
1344 char buf[sizeof("TYPE65535")];
1345
1346 RDATATYPE_TOTEXT_SW
1347 snprintf(buf, sizeof(buf), "TYPE%u", type);
1348 return (str_totext(buf, target));
1349 }
1350
1351 void
dns_rdatatype_format(dns_rdatatype_t rdtype,char * array,unsigned int size)1352 dns_rdatatype_format(dns_rdatatype_t rdtype,
1353 char *array, unsigned int size)
1354 {
1355 isc_result_t result;
1356 isc_buffer_t buf;
1357
1358 if (size == 0U)
1359 return;
1360
1361 isc_buffer_init(&buf, array, size);
1362 result = dns_rdatatype_totext(rdtype, &buf);
1363 /*
1364 * Null terminate.
1365 */
1366 if (result == ISC_R_SUCCESS) {
1367 if (isc_buffer_availablelength(&buf) >= 1)
1368 isc_buffer_putuint8(&buf, 0);
1369 else
1370 result = ISC_R_NOSPACE;
1371 }
1372 if (result != ISC_R_SUCCESS)
1373 strlcpy(array, "<unknown>", size);
1374 }
1375
1376 /*
1377 * Private function.
1378 */
1379
1380 static unsigned int
name_length(dns_name_t * name)1381 name_length(dns_name_t *name) {
1382 return (name->length);
1383 }
1384
1385 static isc_result_t
txt_totext(isc_region_t * source,isc_boolean_t quote,isc_buffer_t * target)1386 txt_totext(isc_region_t *source, isc_boolean_t quote, isc_buffer_t *target) {
1387 unsigned int tl;
1388 unsigned int n;
1389 unsigned char *sp;
1390 char *tp;
1391 isc_region_t region;
1392
1393 isc_buffer_availableregion(target, ®ion);
1394 sp = source->base;
1395 tp = (char *)region.base;
1396 tl = region.length;
1397
1398 n = *sp++;
1399
1400 REQUIRE(n + 1 <= source->length);
1401 if (n == 0U)
1402 REQUIRE(quote == ISC_TRUE);
1403
1404 if (quote) {
1405 if (tl < 1)
1406 return (ISC_R_NOSPACE);
1407 *tp++ = '"';
1408 tl--;
1409 }
1410 while (n--) {
1411 /*
1412 * \DDD space (0x20) if not quoting.
1413 */
1414 if (*sp < (quote ? 0x20 : 0x21) || *sp >= 0x7f) {
1415 if (tl < 4)
1416 return (ISC_R_NOSPACE);
1417 *tp++ = 0x5c;
1418 *tp++ = 0x30 + ((*sp / 100) % 10);
1419 *tp++ = 0x30 + ((*sp / 10) % 10);
1420 *tp++ = 0x30 + (*sp % 10);
1421 sp++;
1422 tl -= 4;
1423 continue;
1424 }
1425 /*
1426 * Escape double quote and backslash. If we are not
1427 * enclosing the string in double quotes also escape
1428 * at sign and semicolon.
1429 */
1430 if (*sp == 0x22 || *sp == 0x5c ||
1431 (!quote && (*sp == 0x40 || *sp == 0x3b))) {
1432 if (tl < 2)
1433 return (ISC_R_NOSPACE);
1434 *tp++ = '\\';
1435 tl--;
1436 }
1437 if (tl < 1)
1438 return (ISC_R_NOSPACE);
1439 *tp++ = *sp++;
1440 tl--;
1441 }
1442 if (quote) {
1443 if (tl < 1)
1444 return (ISC_R_NOSPACE);
1445 *tp++ = '"';
1446 tl--;
1447 }
1448 isc_buffer_add(target, (unsigned int)(tp - (char *)region.base));
1449 isc_region_consume(source, *source->base + 1);
1450 return (ISC_R_SUCCESS);
1451 }
1452
1453 static isc_result_t
txt_fromtext(isc_textregion_t * source,isc_buffer_t * target)1454 txt_fromtext(isc_textregion_t *source, isc_buffer_t *target) {
1455 isc_region_t tregion;
1456 isc_boolean_t escape;
1457 unsigned int n, nrem;
1458 char *s;
1459 unsigned char *t;
1460 int d;
1461 int c;
1462
1463 isc_buffer_availableregion(target, &tregion);
1464 s = source->base;
1465 n = source->length;
1466 t = tregion.base;
1467 nrem = tregion.length;
1468 escape = ISC_FALSE;
1469 if (nrem < 1)
1470 return (ISC_R_NOSPACE);
1471 /*
1472 * Length byte.
1473 */
1474 nrem--;
1475 t++;
1476 /*
1477 * Maximum text string length.
1478 */
1479 if (nrem > 255)
1480 nrem = 255;
1481 while (n-- != 0) {
1482 c = (*s++) & 0xff;
1483 if (escape && (d = decvalue((char)c)) != -1) {
1484 c = d;
1485 if (n == 0)
1486 return (DNS_R_SYNTAX);
1487 n--;
1488 if ((d = decvalue(*s++)) != -1)
1489 c = c * 10 + d;
1490 else
1491 return (DNS_R_SYNTAX);
1492 if (n == 0)
1493 return (DNS_R_SYNTAX);
1494 n--;
1495 if ((d = decvalue(*s++)) != -1)
1496 c = c * 10 + d;
1497 else
1498 return (DNS_R_SYNTAX);
1499 if (c > 255)
1500 return (DNS_R_SYNTAX);
1501 } else if (!escape && c == '\\') {
1502 escape = ISC_TRUE;
1503 continue;
1504 }
1505 escape = ISC_FALSE;
1506 if (nrem == 0)
1507 return ((tregion.length <= 256U) ?
1508 ISC_R_NOSPACE : DNS_R_SYNTAX);
1509 *t++ = c;
1510 nrem--;
1511 }
1512 if (escape)
1513 return (DNS_R_SYNTAX);
1514 *tregion.base = (unsigned char)(t - tregion.base - 1);
1515 isc_buffer_add(target, *tregion.base + 1);
1516 return (ISC_R_SUCCESS);
1517 }
1518
1519 static isc_result_t
txt_fromwire(isc_buffer_t * source,isc_buffer_t * target)1520 txt_fromwire(isc_buffer_t *source, isc_buffer_t *target) {
1521 unsigned int n;
1522 isc_region_t sregion;
1523 isc_region_t tregion;
1524
1525 isc_buffer_activeregion(source, &sregion);
1526 if (sregion.length == 0)
1527 return (ISC_R_UNEXPECTEDEND);
1528 n = *sregion.base + 1;
1529 if (n > sregion.length)
1530 return (ISC_R_UNEXPECTEDEND);
1531
1532 isc_buffer_availableregion(target, &tregion);
1533 if (n > tregion.length)
1534 return (ISC_R_NOSPACE);
1535
1536 if (tregion.base != sregion.base)
1537 memmove(tregion.base, sregion.base, n);
1538 isc_buffer_forward(source, n);
1539 isc_buffer_add(target, n);
1540 return (ISC_R_SUCCESS);
1541 }
1542
1543 /*
1544 * Conversion of TXT-like rdata fields without length limits.
1545 */
1546 static isc_result_t
multitxt_totext(isc_region_t * source,isc_buffer_t * target)1547 multitxt_totext(isc_region_t *source, isc_buffer_t *target) {
1548 unsigned int tl;
1549 unsigned int n0, n;
1550 unsigned char *sp;
1551 char *tp;
1552 isc_region_t region;
1553
1554 isc_buffer_availableregion(target, ®ion);
1555 sp = source->base;
1556 tp = (char *)region.base;
1557 tl = region.length;
1558
1559 if (tl < 1)
1560 return (ISC_R_NOSPACE);
1561 *tp++ = '"';
1562 tl--;
1563 do {
1564 n = source->length;
1565 n0 = source->length - 1;
1566
1567 while (n--) {
1568 if (*sp < 0x20 || *sp >= 0x7f) {
1569 if (tl < 4)
1570 return (ISC_R_NOSPACE);
1571 *tp++ = 0x5c;
1572 *tp++ = 0x30 + ((*sp / 100) % 10);
1573 *tp++ = 0x30 + ((*sp / 10) % 10);
1574 *tp++ = 0x30 + (*sp % 10);
1575 sp++;
1576 tl -= 4;
1577 continue;
1578 }
1579 /* double quote, semi-colon, backslash */
1580 if (*sp == 0x22 || *sp == 0x3b || *sp == 0x5c) {
1581 if (tl < 2)
1582 return (ISC_R_NOSPACE);
1583 *tp++ = '\\';
1584 tl--;
1585 }
1586 if (tl < 1)
1587 return (ISC_R_NOSPACE);
1588 *tp++ = *sp++;
1589 tl--;
1590 }
1591 isc_region_consume(source, n0 + 1);
1592 } while (source->length != 0);
1593 if (tl < 1)
1594 return (ISC_R_NOSPACE);
1595 *tp++ = '"';
1596 tl--;
1597 isc_buffer_add(target, (unsigned int)(tp - (char *)region.base));
1598 return (ISC_R_SUCCESS);
1599 }
1600
1601 static isc_result_t
multitxt_fromtext(isc_textregion_t * source,isc_buffer_t * target)1602 multitxt_fromtext(isc_textregion_t *source, isc_buffer_t *target) {
1603 isc_region_t tregion;
1604 isc_boolean_t escape;
1605 unsigned int n, nrem;
1606 char *s;
1607 unsigned char *t0, *t;
1608 int d;
1609 int c;
1610
1611 s = source->base;
1612 n = source->length;
1613 escape = ISC_FALSE;
1614
1615 do {
1616 isc_buffer_availableregion(target, &tregion);
1617 t0 = t = tregion.base;
1618 nrem = tregion.length;
1619 if (nrem < 1)
1620 return (ISC_R_NOSPACE);
1621
1622 while (n != 0) {
1623 --n;
1624 c = (*s++) & 0xff;
1625 if (escape && (d = decvalue((char)c)) != -1) {
1626 c = d;
1627 if (n == 0)
1628 return (DNS_R_SYNTAX);
1629 n--;
1630 if ((d = decvalue(*s++)) != -1)
1631 c = c * 10 + d;
1632 else
1633 return (DNS_R_SYNTAX);
1634 if (n == 0)
1635 return (DNS_R_SYNTAX);
1636 n--;
1637 if ((d = decvalue(*s++)) != -1)
1638 c = c * 10 + d;
1639 else
1640 return (DNS_R_SYNTAX);
1641 if (c > 255)
1642 return (DNS_R_SYNTAX);
1643 } else if (!escape && c == '\\') {
1644 escape = ISC_TRUE;
1645 continue;
1646 }
1647 escape = ISC_FALSE;
1648 *t++ = c;
1649 nrem--;
1650 if (nrem == 0)
1651 break;
1652 }
1653 if (escape)
1654 return (DNS_R_SYNTAX);
1655
1656 isc_buffer_add(target, (unsigned int)(t - t0));
1657 } while (n != 0);
1658 return (ISC_R_SUCCESS);
1659 }
1660
1661 static isc_boolean_t
name_prefix(dns_name_t * name,dns_name_t * origin,dns_name_t * target)1662 name_prefix(dns_name_t *name, dns_name_t *origin, dns_name_t *target) {
1663 int l1, l2;
1664
1665 if (origin == NULL)
1666 goto return_false;
1667
1668 if (dns_name_compare(origin, dns_rootname) == 0)
1669 goto return_false;
1670
1671 if (!dns_name_issubdomain(name, origin))
1672 goto return_false;
1673
1674 l1 = dns_name_countlabels(name);
1675 l2 = dns_name_countlabels(origin);
1676
1677 if (l1 == l2)
1678 goto return_false;
1679
1680 /* Master files should be case preserving. */
1681 dns_name_getlabelsequence(name, l1 - l2, l2, target);
1682 if (!dns_name_caseequal(origin, target))
1683 goto return_false;
1684
1685 dns_name_getlabelsequence(name, 0, l1 - l2, target);
1686 return (ISC_TRUE);
1687
1688 return_false:
1689 *target = *name;
1690 return (ISC_FALSE);
1691 }
1692
1693 static isc_result_t
str_totext(const char * source,isc_buffer_t * target)1694 str_totext(const char *source, isc_buffer_t *target) {
1695 unsigned int l;
1696 isc_region_t region;
1697
1698 isc_buffer_availableregion(target, ®ion);
1699 l = strlen(source);
1700
1701 if (l > region.length)
1702 return (ISC_R_NOSPACE);
1703
1704 memmove(region.base, source, l);
1705 isc_buffer_add(target, l);
1706 return (ISC_R_SUCCESS);
1707 }
1708
1709 static isc_result_t
inet_totext(int af,isc_region_t * src,isc_buffer_t * target)1710 inet_totext(int af, isc_region_t *src, isc_buffer_t *target) {
1711 char tmpbuf[64];
1712
1713 /* Note - inet_ntop doesn't do size checking on its input. */
1714 if (inet_ntop(af, src->base, tmpbuf, sizeof(tmpbuf)) == NULL)
1715 return (ISC_R_NOSPACE);
1716 if (strlen(tmpbuf) > isc_buffer_availablelength(target))
1717 return (ISC_R_NOSPACE);
1718 isc_buffer_putstr(target, tmpbuf);
1719 return (ISC_R_SUCCESS);
1720 }
1721
1722 static isc_boolean_t
buffer_empty(isc_buffer_t * source)1723 buffer_empty(isc_buffer_t *source) {
1724 return((source->current == source->active) ? ISC_TRUE : ISC_FALSE);
1725 }
1726
1727 static void
buffer_fromregion(isc_buffer_t * buffer,isc_region_t * region)1728 buffer_fromregion(isc_buffer_t *buffer, isc_region_t *region) {
1729 isc_buffer_init(buffer, region->base, region->length);
1730 isc_buffer_add(buffer, region->length);
1731 isc_buffer_setactive(buffer, region->length);
1732 }
1733
1734 static isc_result_t
uint32_tobuffer(isc_uint32_t value,isc_buffer_t * target)1735 uint32_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
1736 isc_region_t region;
1737
1738 isc_buffer_availableregion(target, ®ion);
1739 if (region.length < 4)
1740 return (ISC_R_NOSPACE);
1741 isc_buffer_putuint32(target, value);
1742 return (ISC_R_SUCCESS);
1743 }
1744
1745 static isc_result_t
uint16_tobuffer(isc_uint32_t value,isc_buffer_t * target)1746 uint16_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
1747 isc_region_t region;
1748
1749 if (value > 0xffff)
1750 return (ISC_R_RANGE);
1751 isc_buffer_availableregion(target, ®ion);
1752 if (region.length < 2)
1753 return (ISC_R_NOSPACE);
1754 isc_buffer_putuint16(target, (isc_uint16_t)value);
1755 return (ISC_R_SUCCESS);
1756 }
1757
1758 static isc_result_t
uint8_tobuffer(isc_uint32_t value,isc_buffer_t * target)1759 uint8_tobuffer(isc_uint32_t value, isc_buffer_t *target) {
1760 isc_region_t region;
1761
1762 if (value > 0xff)
1763 return (ISC_R_RANGE);
1764 isc_buffer_availableregion(target, ®ion);
1765 if (region.length < 1)
1766 return (ISC_R_NOSPACE);
1767 isc_buffer_putuint8(target, (isc_uint8_t)value);
1768 return (ISC_R_SUCCESS);
1769 }
1770
1771 static isc_result_t
name_tobuffer(dns_name_t * name,isc_buffer_t * target)1772 name_tobuffer(dns_name_t *name, isc_buffer_t *target) {
1773 isc_region_t r;
1774 dns_name_toregion(name, &r);
1775 return (isc_buffer_copyregion(target, &r));
1776 }
1777
1778 static isc_uint32_t
uint32_fromregion(isc_region_t * region)1779 uint32_fromregion(isc_region_t *region) {
1780 isc_uint32_t value;
1781
1782 REQUIRE(region->length >= 4);
1783 value = region->base[0] << 24;
1784 value |= region->base[1] << 16;
1785 value |= region->base[2] << 8;
1786 value |= region->base[3];
1787 return(value);
1788 }
1789
1790 static isc_uint16_t
uint16_consume_fromregion(isc_region_t * region)1791 uint16_consume_fromregion(isc_region_t *region) {
1792 isc_uint16_t r = uint16_fromregion(region);
1793
1794 isc_region_consume(region, 2);
1795 return r;
1796 }
1797
1798 static isc_uint16_t
uint16_fromregion(isc_region_t * region)1799 uint16_fromregion(isc_region_t *region) {
1800
1801 REQUIRE(region->length >= 2);
1802
1803 return ((region->base[0] << 8) | region->base[1]);
1804 }
1805
1806 static isc_uint8_t
uint8_fromregion(isc_region_t * region)1807 uint8_fromregion(isc_region_t *region) {
1808
1809 REQUIRE(region->length >= 1);
1810
1811 return (region->base[0]);
1812 }
1813
1814 static isc_uint8_t
uint8_consume_fromregion(isc_region_t * region)1815 uint8_consume_fromregion(isc_region_t *region) {
1816 isc_uint8_t r = uint8_fromregion(region);
1817
1818 isc_region_consume(region, 1);
1819 return r;
1820 }
1821
1822 static isc_result_t
mem_tobuffer(isc_buffer_t * target,void * base,unsigned int length)1823 mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length) {
1824 isc_region_t tr;
1825
1826 if (length == 0U)
1827 return (ISC_R_SUCCESS);
1828
1829 isc_buffer_availableregion(target, &tr);
1830 if (length > tr.length)
1831 return (ISC_R_NOSPACE);
1832 if (tr.base != base)
1833 memmove(tr.base, base, length);
1834 isc_buffer_add(target, length);
1835 return (ISC_R_SUCCESS);
1836 }
1837
1838 static int
hexvalue(char value)1839 hexvalue(char value) {
1840 const char *s;
1841 unsigned char c;
1842
1843 c = (unsigned char)value;
1844
1845 if (!isascii(c))
1846 return (-1);
1847 if (isupper(c))
1848 c = tolower(c);
1849 if ((s = strchr(hexdigits, c)) == NULL)
1850 return (-1);
1851 return (int)(s - hexdigits);
1852 }
1853
1854 static int
decvalue(char value)1855 decvalue(char value) {
1856 const char *s;
1857
1858 /*
1859 * isascii() is valid for full range of int values, no need to
1860 * mask or cast.
1861 */
1862 if (!isascii(value))
1863 return (-1);
1864 if ((s = strchr(decdigits, value)) == NULL)
1865 return (-1);
1866 return (int)(s - decdigits);
1867 }
1868
1869 static const char atob_digits[86] =
1870 "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`" \
1871 "abcdefghijklmnopqrstu";
1872 /*
1873 * Subroutines to convert between 8 bit binary bytes and printable ASCII.
1874 * Computes the number of bytes, and three kinds of simple checksums.
1875 * Incoming bytes are collected into 32-bit words, then printed in base 85:
1876 * exp(85,5) > exp(2,32)
1877 * The ASCII characters used are between '!' and 'u';
1878 * 'z' encodes 32-bit zero; 'x' is used to mark the end of encoded data.
1879 *
1880 * Originally by Paul Rutter (philabs!per) and Joe Orost (petsd!joe) for
1881 * the atob/btoa programs, released with the compress program, in mod.sources.
1882 * Modified by Mike Schwartz 8/19/86 for use in BIND.
1883 * Modified to be re-entrant 3/2/99.
1884 */
1885
1886
1887 struct state {
1888 isc_int32_t Ceor;
1889 isc_int32_t Csum;
1890 isc_int32_t Crot;
1891 isc_int32_t word;
1892 isc_int32_t bcount;
1893 };
1894
1895 #define Ceor state->Ceor
1896 #define Csum state->Csum
1897 #define Crot state->Crot
1898 #define word state->word
1899 #define bcount state->bcount
1900
1901 #define times85(x) ((((((x<<2)+x)<<2)+x)<<2)+x)
1902
1903 static isc_result_t byte_atob(int c, isc_buffer_t *target,
1904 struct state *state);
1905 static isc_result_t putbyte(int c, isc_buffer_t *, struct state *state);
1906 static isc_result_t byte_btoa(int c, isc_buffer_t *, struct state *state);
1907
1908 /*
1909 * Decode ASCII-encoded byte c into binary representation and
1910 * place into *bufp, advancing bufp.
1911 */
1912 static isc_result_t
byte_atob(int c,isc_buffer_t * target,struct state * state)1913 byte_atob(int c, isc_buffer_t *target, struct state *state) {
1914 const char *s;
1915 if (c == 'z') {
1916 if (bcount != 0)
1917 return(DNS_R_SYNTAX);
1918 else {
1919 RETERR(putbyte(0, target, state));
1920 RETERR(putbyte(0, target, state));
1921 RETERR(putbyte(0, target, state));
1922 RETERR(putbyte(0, target, state));
1923 }
1924 } else if ((s = strchr(atob_digits, c)) != NULL) {
1925 if (bcount == 0) {
1926 word = (isc_int32_t)(s - atob_digits);
1927 ++bcount;
1928 } else if (bcount < 4) {
1929 word = times85(word);
1930 word += (isc_int32_t)(s - atob_digits);
1931 ++bcount;
1932 } else {
1933 word = times85(word);
1934 word += (isc_int32_t)(s - atob_digits);
1935 RETERR(putbyte((word >> 24) & 0xff, target, state));
1936 RETERR(putbyte((word >> 16) & 0xff, target, state));
1937 RETERR(putbyte((word >> 8) & 0xff, target, state));
1938 RETERR(putbyte(word & 0xff, target, state));
1939 word = 0;
1940 bcount = 0;
1941 }
1942 } else
1943 return(DNS_R_SYNTAX);
1944 return(ISC_R_SUCCESS);
1945 }
1946
1947 /*
1948 * Compute checksum info and place c into target.
1949 */
1950 static isc_result_t
putbyte(int c,isc_buffer_t * target,struct state * state)1951 putbyte(int c, isc_buffer_t *target, struct state *state) {
1952 isc_region_t tr;
1953
1954 Ceor ^= c;
1955 Csum += c;
1956 Csum += 1;
1957 if ((Crot & 0x80000000)) {
1958 Crot <<= 1;
1959 Crot += 1;
1960 } else {
1961 Crot <<= 1;
1962 }
1963 Crot += c;
1964 isc_buffer_availableregion(target, &tr);
1965 if (tr.length < 1)
1966 return (ISC_R_NOSPACE);
1967 tr.base[0] = c;
1968 isc_buffer_add(target, 1);
1969 return (ISC_R_SUCCESS);
1970 }
1971
1972 /*
1973 * Read the ASCII-encoded data from inbuf, of length inbuflen, and convert
1974 * it into T_UNSPEC (binary data) in outbuf, not to exceed outbuflen bytes;
1975 * outbuflen must be divisible by 4. (Note: this is because outbuf is filled
1976 * in 4 bytes at a time. If the actual data doesn't end on an even 4-byte
1977 * boundary, there will be no problem...it will be padded with 0 bytes, and
1978 * numbytes will indicate the correct number of bytes. The main point is
1979 * that since the buffer is filled in 4 bytes at a time, even if there is
1980 * not a full 4 bytes of data at the end, there has to be room to 0-pad the
1981 * data, so the buffer must be of size divisible by 4). Place the number of
1982 * output bytes in numbytes, and return a failure/success status.
1983 */
1984
1985 static isc_result_t
atob_tobuffer(isc_lex_t * lexer,isc_buffer_t * target)1986 atob_tobuffer(isc_lex_t *lexer, isc_buffer_t *target) {
1987 long oeor, osum, orot;
1988 struct state statebuf, *state= &statebuf;
1989 isc_token_t token;
1990 char c;
1991 char *e;
1992
1993 Ceor = Csum = Crot = word = bcount = 0;
1994
1995 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
1996 ISC_FALSE));
1997 while (token.value.as_textregion.length != 0) {
1998 if ((c = token.value.as_textregion.base[0]) == 'x') {
1999 break;
2000 } else
2001 RETERR(byte_atob(c, target, state));
2002 isc_textregion_consume(&token.value.as_textregion, 1);
2003 }
2004
2005 /*
2006 * Number of bytes.
2007 */
2008 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
2009 ISC_FALSE));
2010 if ((token.value.as_ulong % 4) != 0U) {
2011 unsigned long padding = 4 - (token.value.as_ulong % 4);
2012 if (isc_buffer_usedlength(target) < padding)
2013 return (DNS_R_SYNTAX);
2014 isc_buffer_subtract(target, padding);
2015 }
2016
2017 /*
2018 * Checksum.
2019 */
2020 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
2021 ISC_FALSE));
2022 oeor = strtol(DNS_AS_STR(token), &e, 16);
2023 if (*e != 0)
2024 return (DNS_R_SYNTAX);
2025
2026 /*
2027 * Checksum.
2028 */
2029 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
2030 ISC_FALSE));
2031 osum = strtol(DNS_AS_STR(token), &e, 16);
2032 if (*e != 0)
2033 return (DNS_R_SYNTAX);
2034
2035 /*
2036 * Checksum.
2037 */
2038 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
2039 ISC_FALSE));
2040 orot = strtol(DNS_AS_STR(token), &e, 16);
2041 if (*e != 0)
2042 return (DNS_R_SYNTAX);
2043
2044 if ((oeor != Ceor) || (osum != Csum) || (orot != Crot))
2045 return(DNS_R_BADCKSUM);
2046 return (ISC_R_SUCCESS);
2047 }
2048
2049 /*
2050 * Encode binary byte c into ASCII representation and place into *bufp,
2051 * advancing bufp.
2052 */
2053 static isc_result_t
byte_btoa(int c,isc_buffer_t * target,struct state * state)2054 byte_btoa(int c, isc_buffer_t *target, struct state *state) {
2055 isc_region_t tr;
2056
2057 isc_buffer_availableregion(target, &tr);
2058 Ceor ^= c;
2059 Csum += c;
2060 Csum += 1;
2061 if ((Crot & 0x80000000)) {
2062 Crot <<= 1;
2063 Crot += 1;
2064 } else {
2065 Crot <<= 1;
2066 }
2067 Crot += c;
2068
2069 word <<= 8;
2070 word |= c;
2071 if (bcount == 3) {
2072 if (word == 0) {
2073 if (tr.length < 1)
2074 return (ISC_R_NOSPACE);
2075 tr.base[0] = 'z';
2076 isc_buffer_add(target, 1);
2077 } else {
2078 register int tmp = 0;
2079 register isc_int32_t tmpword = word;
2080
2081 if (tmpword < 0) {
2082 /*
2083 * Because some don't support u_long.
2084 */
2085 tmp = 32;
2086 tmpword -= (isc_int32_t)(85 * 85 * 85 * 85 * 32);
2087 }
2088 if (tmpword < 0) {
2089 tmp = 64;
2090 tmpword -= (isc_int32_t)(85 * 85 * 85 * 85 * 32);
2091 }
2092 if (tr.length < 5)
2093 return (ISC_R_NOSPACE);
2094 tr.base[0] = atob_digits[(tmpword /
2095 (isc_int32_t)(85 * 85 * 85 * 85))
2096 + tmp];
2097 tmpword %= (isc_int32_t)(85 * 85 * 85 * 85);
2098 tr.base[1] = atob_digits[tmpword / (85 * 85 * 85)];
2099 tmpword %= (85 * 85 * 85);
2100 tr.base[2] = atob_digits[tmpword / (85 * 85)];
2101 tmpword %= (85 * 85);
2102 tr.base[3] = atob_digits[tmpword / 85];
2103 tmpword %= 85;
2104 tr.base[4] = atob_digits[tmpword];
2105 isc_buffer_add(target, 5);
2106 }
2107 bcount = 0;
2108 } else {
2109 bcount += 1;
2110 }
2111 return (ISC_R_SUCCESS);
2112 }
2113
2114
2115 /*
2116 * Encode the binary data from inbuf, of length inbuflen, into a
2117 * target. Return success/failure status
2118 */
2119 static isc_result_t
btoa_totext(unsigned char * inbuf,int inbuflen,isc_buffer_t * target)2120 btoa_totext(unsigned char *inbuf, int inbuflen, isc_buffer_t *target) {
2121 int inc;
2122 struct state statebuf, *state = &statebuf;
2123 char buf[sizeof("x 2000000000 ffffffff ffffffff ffffffff")];
2124
2125 Ceor = Csum = Crot = word = bcount = 0;
2126 for (inc = 0; inc < inbuflen; inbuf++, inc++)
2127 RETERR(byte_btoa(*inbuf, target, state));
2128
2129 while (bcount != 0)
2130 RETERR(byte_btoa(0, target, state));
2131
2132 /*
2133 * Put byte count and checksum information at end of buffer,
2134 * delimited by 'x'
2135 */
2136 snprintf(buf, sizeof(buf), "x %d %x %x %x", inbuflen, Ceor, Csum, Crot);
2137 return (str_totext(buf, target));
2138 }
2139
2140
2141 static void
default_fromtext_callback(dns_rdatacallbacks_t * callbacks,const char * fmt,...)2142 default_fromtext_callback(dns_rdatacallbacks_t *callbacks, const char *fmt,
2143 ...)
2144 {
2145 va_list ap;
2146
2147 UNUSED(callbacks);
2148
2149 va_start(ap, fmt);
2150 vfprintf(stderr, fmt, ap);
2151 va_end(ap);
2152 fprintf(stderr, "\n");
2153 }
2154
2155 static void
fromtext_warneof(isc_lex_t * lexer,dns_rdatacallbacks_t * callbacks)2156 fromtext_warneof(isc_lex_t *lexer, dns_rdatacallbacks_t *callbacks) {
2157 if (isc_lex_isfile(lexer) && callbacks != NULL) {
2158 const char *name = isc_lex_getsourcename(lexer);
2159 if (name == NULL)
2160 name = "UNKNOWN";
2161 (*callbacks->warn)(callbacks,
2162 "%s:%lu: file does not end with newline",
2163 name, isc_lex_getsourceline(lexer));
2164 }
2165 }
2166
2167 static void
warn_badmx(isc_token_t * token,isc_lex_t * lexer,dns_rdatacallbacks_t * callbacks)2168 warn_badmx(isc_token_t *token, isc_lex_t *lexer,
2169 dns_rdatacallbacks_t *callbacks)
2170 {
2171 const char *file;
2172 unsigned long line;
2173
2174 if (lexer != NULL) {
2175 file = isc_lex_getsourcename(lexer);
2176 line = isc_lex_getsourceline(lexer);
2177 (*callbacks->warn)(callbacks, "%s:%u: warning: '%s': %s",
2178 file, line, DNS_AS_STR(*token),
2179 dns_result_totext(DNS_R_MXISADDRESS));
2180 }
2181 }
2182
2183 static void
warn_badname(dns_name_t * name,isc_lex_t * lexer,dns_rdatacallbacks_t * callbacks)2184 warn_badname(dns_name_t *name, isc_lex_t *lexer,
2185 dns_rdatacallbacks_t *callbacks)
2186 {
2187 const char *file;
2188 unsigned long line;
2189 char namebuf[DNS_NAME_FORMATSIZE];
2190
2191 if (lexer != NULL) {
2192 file = isc_lex_getsourcename(lexer);
2193 line = isc_lex_getsourceline(lexer);
2194 dns_name_format(name, namebuf, sizeof(namebuf));
2195 (*callbacks->warn)(callbacks, "%s:%u: warning: %s: %s",
2196 file, line, namebuf,
2197 dns_result_totext(DNS_R_BADNAME));
2198 }
2199 }
2200
2201 static void
fromtext_error(void (* callback)(dns_rdatacallbacks_t *,const char *,...),dns_rdatacallbacks_t * callbacks,const char * name,unsigned long line,isc_token_t * token,isc_result_t result)2202 fromtext_error(void (*callback)(dns_rdatacallbacks_t *, const char *, ...),
2203 dns_rdatacallbacks_t *callbacks, const char *name,
2204 unsigned long line, isc_token_t *token, isc_result_t result)
2205 {
2206 if (name == NULL)
2207 name = "UNKNOWN";
2208
2209 if (token != NULL) {
2210 switch (token->type) {
2211 case isc_tokentype_eol:
2212 (*callback)(callbacks, "%s: %s:%lu: near eol: %s",
2213 "dns_rdata_fromtext", name, line,
2214 dns_result_totext(result));
2215 break;
2216 case isc_tokentype_eof:
2217 (*callback)(callbacks, "%s: %s:%lu: near eof: %s",
2218 "dns_rdata_fromtext", name, line,
2219 dns_result_totext(result));
2220 break;
2221 case isc_tokentype_number:
2222 (*callback)(callbacks, "%s: %s:%lu: near %lu: %s",
2223 "dns_rdata_fromtext", name, line,
2224 token->value.as_ulong,
2225 dns_result_totext(result));
2226 break;
2227 case isc_tokentype_string:
2228 case isc_tokentype_qstring:
2229 (*callback)(callbacks, "%s: %s:%lu: near '%s': %s",
2230 "dns_rdata_fromtext", name, line,
2231 DNS_AS_STR(*token),
2232 dns_result_totext(result));
2233 break;
2234 default:
2235 (*callback)(callbacks, "%s: %s:%lu: %s",
2236 "dns_rdata_fromtext", name, line,
2237 dns_result_totext(result));
2238 break;
2239 }
2240 } else {
2241 (*callback)(callbacks, "dns_rdata_fromtext: %s:%lu: %s",
2242 name, line, dns_result_totext(result));
2243 }
2244 }
2245
2246 dns_rdatatype_t
dns_rdata_covers(dns_rdata_t * rdata)2247 dns_rdata_covers(dns_rdata_t *rdata) {
2248 if (rdata->type == 46)
2249 return (covers_rrsig(rdata));
2250 return (covers_sig(rdata));
2251 }
2252
2253 isc_boolean_t
dns_rdatatype_ismeta(dns_rdatatype_t type)2254 dns_rdatatype_ismeta(dns_rdatatype_t type) {
2255 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_META) != 0)
2256 return (ISC_TRUE);
2257 return (ISC_FALSE);
2258 }
2259
2260 isc_boolean_t
dns_rdatatype_issingleton(dns_rdatatype_t type)2261 dns_rdatatype_issingleton(dns_rdatatype_t type) {
2262 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_SINGLETON)
2263 != 0)
2264 return (ISC_TRUE);
2265 return (ISC_FALSE);
2266 }
2267
2268 isc_boolean_t
dns_rdatatype_notquestion(dns_rdatatype_t type)2269 dns_rdatatype_notquestion(dns_rdatatype_t type) {
2270 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_NOTQUESTION)
2271 != 0)
2272 return (ISC_TRUE);
2273 return (ISC_FALSE);
2274 }
2275
2276 isc_boolean_t
dns_rdatatype_questiononly(dns_rdatatype_t type)2277 dns_rdatatype_questiononly(dns_rdatatype_t type) {
2278 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_QUESTIONONLY)
2279 != 0)
2280 return (ISC_TRUE);
2281 return (ISC_FALSE);
2282 }
2283
2284 isc_boolean_t
dns_rdatatype_atparent(dns_rdatatype_t type)2285 dns_rdatatype_atparent(dns_rdatatype_t type) {
2286 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_ATPARENT) != 0)
2287 return (ISC_TRUE);
2288 return (ISC_FALSE);
2289 }
2290
2291 isc_boolean_t
dns_rdataclass_ismeta(dns_rdataclass_t rdclass)2292 dns_rdataclass_ismeta(dns_rdataclass_t rdclass) {
2293
2294 if (rdclass == dns_rdataclass_reserved0
2295 || rdclass == dns_rdataclass_none
2296 || rdclass == dns_rdataclass_any)
2297 return (ISC_TRUE);
2298
2299 return (ISC_FALSE); /* Assume it is not a meta class. */
2300 }
2301
2302 isc_boolean_t
dns_rdatatype_isdnssec(dns_rdatatype_t type)2303 dns_rdatatype_isdnssec(dns_rdatatype_t type) {
2304 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_DNSSEC) != 0)
2305 return (ISC_TRUE);
2306 return (ISC_FALSE);
2307 }
2308
2309 isc_boolean_t
dns_rdatatype_iszonecutauth(dns_rdatatype_t type)2310 dns_rdatatype_iszonecutauth(dns_rdatatype_t type) {
2311 if ((dns_rdatatype_attributes(type)
2312 & (DNS_RDATATYPEATTR_DNSSEC | DNS_RDATATYPEATTR_ZONECUTAUTH))
2313 != 0)
2314 return (ISC_TRUE);
2315 return (ISC_FALSE);
2316 }
2317
2318 isc_boolean_t
dns_rdatatype_isknown(dns_rdatatype_t type)2319 dns_rdatatype_isknown(dns_rdatatype_t type) {
2320 if ((dns_rdatatype_attributes(type) & DNS_RDATATYPEATTR_UNKNOWN)
2321 == 0)
2322 return (ISC_TRUE);
2323 return (ISC_FALSE);
2324 }
2325
2326 void
dns_rdata_exists(dns_rdata_t * rdata,dns_rdatatype_t type)2327 dns_rdata_exists(dns_rdata_t *rdata, dns_rdatatype_t type) {
2328
2329 REQUIRE(rdata != NULL);
2330 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2331
2332 rdata->data = NULL;
2333 rdata->length = 0;
2334 rdata->flags = DNS_RDATA_UPDATE;
2335 rdata->type = type;
2336 rdata->rdclass = dns_rdataclass_any;
2337 }
2338
2339 void
dns_rdata_notexist(dns_rdata_t * rdata,dns_rdatatype_t type)2340 dns_rdata_notexist(dns_rdata_t *rdata, dns_rdatatype_t type) {
2341
2342 REQUIRE(rdata != NULL);
2343 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2344
2345 rdata->data = NULL;
2346 rdata->length = 0;
2347 rdata->flags = DNS_RDATA_UPDATE;
2348 rdata->type = type;
2349 rdata->rdclass = dns_rdataclass_none;
2350 }
2351
2352 void
dns_rdata_deleterrset(dns_rdata_t * rdata,dns_rdatatype_t type)2353 dns_rdata_deleterrset(dns_rdata_t *rdata, dns_rdatatype_t type) {
2354
2355 REQUIRE(rdata != NULL);
2356 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2357
2358 rdata->data = NULL;
2359 rdata->length = 0;
2360 rdata->flags = DNS_RDATA_UPDATE;
2361 rdata->type = type;
2362 rdata->rdclass = dns_rdataclass_any;
2363 }
2364
2365 void
dns_rdata_makedelete(dns_rdata_t * rdata)2366 dns_rdata_makedelete(dns_rdata_t *rdata) {
2367 REQUIRE(rdata != NULL);
2368
2369 rdata->rdclass = dns_rdataclass_none;
2370 }
2371
2372 const char *
dns_rdata_updateop(dns_rdata_t * rdata,dns_section_t section)2373 dns_rdata_updateop(dns_rdata_t *rdata, dns_section_t section) {
2374
2375 REQUIRE(rdata != NULL);
2376 REQUIRE(DNS_RDATA_INITIALIZED(rdata));
2377
2378 switch (section) {
2379 case DNS_SECTION_PREREQUISITE:
2380 switch (rdata->rdclass) {
2381 case dns_rdataclass_none:
2382 switch (rdata->type) {
2383 case dns_rdatatype_any:
2384 return ("domain doesn't exist");
2385 default:
2386 return ("rrset doesn't exist");
2387 }
2388 case dns_rdataclass_any:
2389 switch (rdata->type) {
2390 case dns_rdatatype_any:
2391 return ("domain exists");
2392 default:
2393 return ("rrset exists (value independent)");
2394 }
2395 default:
2396 return ("rrset exists (value dependent)");
2397 }
2398 case DNS_SECTION_UPDATE:
2399 switch (rdata->rdclass) {
2400 case dns_rdataclass_none:
2401 return ("delete");
2402 case dns_rdataclass_any:
2403 switch (rdata->type) {
2404 case dns_rdatatype_any:
2405 return ("delete all rrsets");
2406 default:
2407 return ("delete rrset");
2408 }
2409 default:
2410 return ("add");
2411 }
2412 }
2413 return ("invalid");
2414 }
2415