/contrib/bind9/lib/dns/rdata/generic/mx_15.c

  1/*
  2 * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
  3 * Copyright (C) 1998-2001, 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: mx_15.c,v 1.58 2009/12/04 22:06:37 tbox Exp $ */
 19
 20/* reviewed: Wed Mar 15 18:05:46 PST 2000 by brister */
 21
 22#ifndef RDATA_GENERIC_MX_15_C
 23#define RDATA_GENERIC_MX_15_C
 24
 25#include <string.h>
 26
 27#include <isc/net.h>
 28
 29#define RRTYPE_MX_ATTRIBUTES (0)
 30
 31static isc_boolean_t
 32check_mx(isc_token_t *token) {
 33	char tmp[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:123.123.123.123.")];
 34	struct in_addr addr;
 35	struct in6_addr addr6;
 36
 37	if (strlcpy(tmp, DNS_AS_STR(*token), sizeof(tmp)) >= sizeof(tmp))
 38		return (ISC_TRUE);
 39
 40	if (tmp[strlen(tmp) - 1] == '.')
 41		tmp[strlen(tmp) - 1] = '\0';
 42	if (inet_aton(tmp, &addr) == 1 ||
 43	    inet_pton(AF_INET6, tmp, &addr6) == 1)
 44		return (ISC_FALSE);
 45
 46	return (ISC_TRUE);
 47}
 48
 49static inline isc_result_t
 50fromtext_mx(ARGS_FROMTEXT) {
 51	isc_token_t token;
 52	dns_name_t name;
 53	isc_buffer_t buffer;
 54	isc_boolean_t ok;
 55
 56	REQUIRE(type == 15);
 57
 58	UNUSED(type);
 59	UNUSED(rdclass);
 60	UNUSED(callbacks);
 61
 62	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
 63				      ISC_FALSE));
 64	if (token.value.as_ulong > 0xffffU)
 65		RETTOK(ISC_R_RANGE);
 66	RETERR(uint16_tobuffer(token.value.as_ulong, target));
 67
 68	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
 69				      ISC_FALSE));
 70
 71	ok = ISC_TRUE;
 72	if ((options & DNS_RDATA_CHECKMX) != 0)
 73		ok = check_mx(&token);
 74	if (!ok && (options & DNS_RDATA_CHECKMXFAIL) != 0)
 75		RETTOK(DNS_R_MXISADDRESS);
 76	if (!ok && callbacks != NULL)
 77		warn_badmx(&token, lexer, callbacks);
 78
 79	dns_name_init(&name, NULL);
 80	buffer_fromregion(&buffer, &token.value.as_region);
 81	origin = (origin != NULL) ? origin : dns_rootname;
 82	RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
 83	ok = ISC_TRUE;
 84	if ((options & DNS_RDATA_CHECKNAMES) != 0)
 85		ok = dns_name_ishostname(&name, ISC_FALSE);
 86	if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0)
 87		RETTOK(DNS_R_BADNAME);
 88	if (!ok && callbacks != NULL)
 89		warn_badname(&name, lexer, callbacks);
 90	return (ISC_R_SUCCESS);
 91}
 92
 93static inline isc_result_t
 94totext_mx(ARGS_TOTEXT) {
 95	isc_region_t region;
 96	dns_name_t name;
 97	dns_name_t prefix;
 98	isc_boolean_t sub;
 99	char buf[sizeof("64000")];
100	unsigned short num;
101
102	REQUIRE(rdata->type == 15);
103	REQUIRE(rdata->length != 0);
104
105	dns_name_init(&name, NULL);
106	dns_name_init(&prefix, NULL);
107
108	dns_rdata_toregion(rdata, &region);
109	num = uint16_fromregion(&region);
110	isc_region_consume(&region, 2);
111	sprintf(buf, "%u", num);
112	RETERR(str_totext(buf, target));
113
114	RETERR(str_totext(" ", target));
115
116	dns_name_fromregion(&name, &region);
117	sub = name_prefix(&name, tctx->origin, &prefix);
118	return (dns_name_totext(&prefix, sub, target));
119}
120
121static inline isc_result_t
122fromwire_mx(ARGS_FROMWIRE) {
123	dns_name_t name;
124	isc_region_t sregion;
125
126	REQUIRE(type == 15);
127
128	UNUSED(type);
129	UNUSED(rdclass);
130
131	dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
132
133	dns_name_init(&name, NULL);
134
135	isc_buffer_activeregion(source, &sregion);
136	if (sregion.length < 2)
137		return (ISC_R_UNEXPECTEDEND);
138	RETERR(mem_tobuffer(target, sregion.base, 2));
139	isc_buffer_forward(source, 2);
140	return (dns_name_fromwire(&name, source, dctx, options, target));
141}
142
143static inline isc_result_t
144towire_mx(ARGS_TOWIRE) {
145	dns_name_t name;
146	dns_offsets_t offsets;
147	isc_region_t region;
148
149	REQUIRE(rdata->type == 15);
150	REQUIRE(rdata->length != 0);
151
152	dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
153
154	dns_rdata_toregion(rdata, &region);
155	RETERR(mem_tobuffer(target, region.base, 2));
156	isc_region_consume(&region, 2);
157
158	dns_name_init(&name, offsets);
159	dns_name_fromregion(&name, &region);
160
161	return (dns_name_towire(&name, cctx, target));
162}
163
164static inline int
165compare_mx(ARGS_COMPARE) {
166	dns_name_t name1;
167	dns_name_t name2;
168	isc_region_t region1;
169	isc_region_t region2;
170	int order;
171
172	REQUIRE(rdata1->type == rdata2->type);
173	REQUIRE(rdata1->rdclass == rdata2->rdclass);
174	REQUIRE(rdata1->type == 15);
175	REQUIRE(rdata1->length != 0);
176	REQUIRE(rdata2->length != 0);
177
178	order = memcmp(rdata1->data, rdata2->data, 2);
179	if (order != 0)
180		return (order < 0 ? -1 : 1);
181
182	dns_name_init(&name1, NULL);
183	dns_name_init(&name2, NULL);
184
185	dns_rdata_toregion(rdata1, &region1);
186	dns_rdata_toregion(rdata2, &region2);
187
188	isc_region_consume(&region1, 2);
189	isc_region_consume(&region2, 2);
190
191	dns_name_fromregion(&name1, &region1);
192	dns_name_fromregion(&name2, &region2);
193
194	return (dns_name_rdatacompare(&name1, &name2));
195}
196
197static inline isc_result_t
198fromstruct_mx(ARGS_FROMSTRUCT) {
199	dns_rdata_mx_t *mx = source;
200	isc_region_t region;
201
202	REQUIRE(type == 15);
203	REQUIRE(source != NULL);
204	REQUIRE(mx->common.rdtype == type);
205	REQUIRE(mx->common.rdclass == rdclass);
206
207	UNUSED(type);
208	UNUSED(rdclass);
209
210	RETERR(uint16_tobuffer(mx->pref, target));
211	dns_name_toregion(&mx->mx, &region);
212	return (isc_buffer_copyregion(target, &region));
213}
214
215static inline isc_result_t
216tostruct_mx(ARGS_TOSTRUCT) {
217	isc_region_t region;
218	dns_rdata_mx_t *mx = target;
219	dns_name_t name;
220
221	REQUIRE(rdata->type == 15);
222	REQUIRE(target != NULL);
223	REQUIRE(rdata->length != 0);
224
225	mx->common.rdclass = rdata->rdclass;
226	mx->common.rdtype = rdata->type;
227	ISC_LINK_INIT(&mx->common, link);
228
229	dns_name_init(&name, NULL);
230	dns_rdata_toregion(rdata, &region);
231	mx->pref = uint16_fromregion(&region);
232	isc_region_consume(&region, 2);
233	dns_name_fromregion(&name, &region);
234	dns_name_init(&mx->mx, NULL);
235	RETERR(name_duporclone(&name, mctx, &mx->mx));
236	mx->mctx = mctx;
237	return (ISC_R_SUCCESS);
238}
239
240static inline void
241freestruct_mx(ARGS_FREESTRUCT) {
242	dns_rdata_mx_t *mx = source;
243
244	REQUIRE(source != NULL);
245	REQUIRE(mx->common.rdtype == 15);
246
247	if (mx->mctx == NULL)
248		return;
249
250	dns_name_free(&mx->mx, mx->mctx);
251	mx->mctx = NULL;
252}
253
254static inline isc_result_t
255additionaldata_mx(ARGS_ADDLDATA) {
256	dns_name_t name;
257	dns_offsets_t offsets;
258	isc_region_t region;
259
260	REQUIRE(rdata->type == 15);
261
262	dns_name_init(&name, offsets);
263	dns_rdata_toregion(rdata, &region);
264	isc_region_consume(&region, 2);
265	dns_name_fromregion(&name, &region);
266
267	return ((add)(arg, &name, dns_rdatatype_a));
268}
269
270static inline isc_result_t
271digest_mx(ARGS_DIGEST) {
272	isc_region_t r1, r2;
273	dns_name_t name;
274
275	REQUIRE(rdata->type == 15);
276
277	dns_rdata_toregion(rdata, &r1);
278	r2 = r1;
279	isc_region_consume(&r2, 2);
280	r1.length = 2;
281	RETERR((digest)(arg, &r1));
282	dns_name_init(&name, NULL);
283	dns_name_fromregion(&name, &r2);
284	return (dns_name_digest(&name, digest, arg));
285}
286
287static inline isc_boolean_t
288checkowner_mx(ARGS_CHECKOWNER) {
289
290	REQUIRE(type == 15);
291
292	UNUSED(type);
293	UNUSED(rdclass);
294
295	return (dns_name_ishostname(name, wildcard));
296}
297
298static inline isc_boolean_t
299checknames_mx(ARGS_CHECKNAMES) {
300	isc_region_t region;
301	dns_name_t name;
302
303	REQUIRE(rdata->type == 15);
304
305	UNUSED(owner);
306
307	dns_rdata_toregion(rdata, &region);
308	isc_region_consume(&region, 2);
309	dns_name_init(&name, NULL);
310	dns_name_fromregion(&name, &region);
311	if (!dns_name_ishostname(&name, ISC_FALSE)) {
312		if (bad != NULL)
313			dns_name_clone(&name, bad);
314		return (ISC_FALSE);
315	}
316	return (ISC_TRUE);
317}
318
319static inline int
320casecompare_mx(ARGS_COMPARE) {
321	return (compare_mx(rdata1, rdata2));
322}
323
324#endif	/* RDATA_GENERIC_MX_15_C */