1 /* $NetBSD: mx_15.c,v 1.5 2014/12/10 04:37:59 christos Exp $ */
2
3 /*
4 * Copyright (C) 2004, 2005, 2007, 2009, 2012 Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 1998-2001, 2003 Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /* Id: mx_15.c,v 1.58 2009/12/04 22:06:37 tbox Exp */
21
22 /* reviewed: Wed Mar 15 18:05:46 PST 2000 by brister */
23
24 #ifndef RDATA_GENERIC_MX_15_C
25 #define RDATA_GENERIC_MX_15_C
26
27 #include <string.h>
28
29 #include <isc/net.h>
30
31 #define RRTYPE_MX_ATTRIBUTES (0)
32
33 static isc_boolean_t
check_mx(isc_token_t * token)34 check_mx(isc_token_t *token) {
35 char tmp[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:123.123.123.123.")];
36 struct in_addr addr;
37 struct in6_addr addr6;
38
39 if (strlcpy(tmp, DNS_AS_STR(*token), sizeof(tmp)) >= sizeof(tmp))
40 return (ISC_TRUE);
41
42 if (tmp[strlen(tmp) - 1] == '.')
43 tmp[strlen(tmp) - 1] = '\0';
44 if (inet_aton(tmp, &addr) == 1 ||
45 inet_pton(AF_INET6, tmp, &addr6) == 1)
46 return (ISC_FALSE);
47
48 return (ISC_TRUE);
49 }
50
51 static inline isc_result_t
fromtext_mx(ARGS_FROMTEXT)52 fromtext_mx(ARGS_FROMTEXT) {
53 isc_token_t token;
54 dns_name_t name;
55 isc_buffer_t buffer;
56 isc_boolean_t ok;
57
58 REQUIRE(type == 15);
59
60 UNUSED(type);
61 UNUSED(rdclass);
62
63 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
64 ISC_FALSE));
65 if (token.value.as_ulong > 0xffffU)
66 RETTOK(ISC_R_RANGE);
67 RETERR(uint16_tobuffer(token.value.as_ulong, target));
68
69 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
70 ISC_FALSE));
71
72 ok = ISC_TRUE;
73 if ((options & DNS_RDATA_CHECKMX) != 0)
74 ok = check_mx(&token);
75 if (!ok && (options & DNS_RDATA_CHECKMXFAIL) != 0)
76 RETTOK(DNS_R_MXISADDRESS);
77 if (!ok && callbacks != NULL)
78 warn_badmx(&token, lexer, callbacks);
79
80 dns_name_init(&name, NULL);
81 buffer_fromregion(&buffer, &token.value.as_region);
82 origin = (origin != NULL) ? origin : dns_rootname;
83 RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
84 ok = ISC_TRUE;
85 if ((options & DNS_RDATA_CHECKNAMES) != 0)
86 ok = dns_name_ishostname(&name, ISC_FALSE);
87 if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0)
88 RETTOK(DNS_R_BADNAME);
89 if (!ok && callbacks != NULL)
90 warn_badname(&name, lexer, callbacks);
91 return (ISC_R_SUCCESS);
92 }
93
94 static inline isc_result_t
totext_mx(ARGS_TOTEXT)95 totext_mx(ARGS_TOTEXT) {
96 isc_region_t region;
97 dns_name_t name;
98 dns_name_t prefix;
99 isc_boolean_t sub;
100 char buf[sizeof("64000")];
101 unsigned short num;
102
103 REQUIRE(rdata->type == 15);
104 REQUIRE(rdata->length != 0);
105
106 dns_name_init(&name, NULL);
107 dns_name_init(&prefix, NULL);
108
109 dns_rdata_toregion(rdata, ®ion);
110 num = uint16_fromregion(®ion);
111 isc_region_consume(®ion, 2);
112 sprintf(buf, "%u", num);
113 RETERR(str_totext(buf, target));
114
115 RETERR(str_totext(" ", target));
116
117 dns_name_fromregion(&name, ®ion);
118 sub = name_prefix(&name, tctx->origin, &prefix);
119 return (dns_name_totext(&prefix, sub, target));
120 }
121
122 static inline isc_result_t
fromwire_mx(ARGS_FROMWIRE)123 fromwire_mx(ARGS_FROMWIRE) {
124 dns_name_t name;
125 isc_region_t sregion;
126
127 REQUIRE(type == 15);
128
129 UNUSED(type);
130 UNUSED(rdclass);
131
132 dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
133
134 dns_name_init(&name, NULL);
135
136 isc_buffer_activeregion(source, &sregion);
137 if (sregion.length < 2)
138 return (ISC_R_UNEXPECTEDEND);
139 RETERR(mem_tobuffer(target, sregion.base, 2));
140 isc_buffer_forward(source, 2);
141 return (dns_name_fromwire(&name, source, dctx, options, target));
142 }
143
144 static inline isc_result_t
towire_mx(ARGS_TOWIRE)145 towire_mx(ARGS_TOWIRE) {
146 dns_name_t name;
147 dns_offsets_t offsets;
148 isc_region_t region;
149
150 REQUIRE(rdata->type == 15);
151 REQUIRE(rdata->length != 0);
152
153 dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
154
155 dns_rdata_toregion(rdata, ®ion);
156 RETERR(mem_tobuffer(target, region.base, 2));
157 isc_region_consume(®ion, 2);
158
159 dns_name_init(&name, offsets);
160 dns_name_fromregion(&name, ®ion);
161
162 return (dns_name_towire(&name, cctx, target));
163 }
164
165 static inline int
compare_mx(ARGS_COMPARE)166 compare_mx(ARGS_COMPARE) {
167 dns_name_t name1;
168 dns_name_t name2;
169 isc_region_t region1;
170 isc_region_t region2;
171 int order;
172
173 REQUIRE(rdata1->type == rdata2->type);
174 REQUIRE(rdata1->rdclass == rdata2->rdclass);
175 REQUIRE(rdata1->type == 15);
176 REQUIRE(rdata1->length != 0);
177 REQUIRE(rdata2->length != 0);
178
179 order = memcmp(rdata1->data, rdata2->data, 2);
180 if (order != 0)
181 return (order < 0 ? -1 : 1);
182
183 dns_name_init(&name1, NULL);
184 dns_name_init(&name2, NULL);
185
186 dns_rdata_toregion(rdata1, ®ion1);
187 dns_rdata_toregion(rdata2, ®ion2);
188
189 isc_region_consume(®ion1, 2);
190 isc_region_consume(®ion2, 2);
191
192 dns_name_fromregion(&name1, ®ion1);
193 dns_name_fromregion(&name2, ®ion2);
194
195 return (dns_name_rdatacompare(&name1, &name2));
196 }
197
198 static inline isc_result_t
fromstruct_mx(ARGS_FROMSTRUCT)199 fromstruct_mx(ARGS_FROMSTRUCT) {
200 dns_rdata_mx_t *mx = source;
201 isc_region_t region;
202
203 REQUIRE(type == 15);
204 REQUIRE(source != NULL);
205 REQUIRE(mx->common.rdtype == type);
206 REQUIRE(mx->common.rdclass == rdclass);
207
208 UNUSED(type);
209 UNUSED(rdclass);
210
211 RETERR(uint16_tobuffer(mx->pref, target));
212 dns_name_toregion(&mx->mx, ®ion);
213 return (isc_buffer_copyregion(target, ®ion));
214 }
215
216 static inline isc_result_t
tostruct_mx(ARGS_TOSTRUCT)217 tostruct_mx(ARGS_TOSTRUCT) {
218 isc_region_t region;
219 dns_rdata_mx_t *mx = target;
220 dns_name_t name;
221
222 REQUIRE(rdata->type == 15);
223 REQUIRE(target != NULL);
224 REQUIRE(rdata->length != 0);
225
226 mx->common.rdclass = rdata->rdclass;
227 mx->common.rdtype = rdata->type;
228 ISC_LINK_INIT(&mx->common, link);
229
230 dns_name_init(&name, NULL);
231 dns_rdata_toregion(rdata, ®ion);
232 mx->pref = uint16_fromregion(®ion);
233 isc_region_consume(®ion, 2);
234 dns_name_fromregion(&name, ®ion);
235 dns_name_init(&mx->mx, NULL);
236 RETERR(name_duporclone(&name, mctx, &mx->mx));
237 mx->mctx = mctx;
238 return (ISC_R_SUCCESS);
239 }
240
241 static inline void
freestruct_mx(ARGS_FREESTRUCT)242 freestruct_mx(ARGS_FREESTRUCT) {
243 dns_rdata_mx_t *mx = source;
244
245 REQUIRE(source != NULL);
246 REQUIRE(mx->common.rdtype == 15);
247
248 if (mx->mctx == NULL)
249 return;
250
251 dns_name_free(&mx->mx, mx->mctx);
252 mx->mctx = NULL;
253 }
254
255 static inline isc_result_t
additionaldata_mx(ARGS_ADDLDATA)256 additionaldata_mx(ARGS_ADDLDATA) {
257 dns_name_t name;
258 dns_offsets_t offsets;
259 isc_region_t region;
260
261 REQUIRE(rdata->type == 15);
262
263 dns_name_init(&name, offsets);
264 dns_rdata_toregion(rdata, ®ion);
265 isc_region_consume(®ion, 2);
266 dns_name_fromregion(&name, ®ion);
267
268 return ((add)(arg, &name, dns_rdatatype_a));
269 }
270
271 static inline isc_result_t
digest_mx(ARGS_DIGEST)272 digest_mx(ARGS_DIGEST) {
273 isc_region_t r1, r2;
274 dns_name_t name;
275
276 REQUIRE(rdata->type == 15);
277
278 dns_rdata_toregion(rdata, &r1);
279 r2 = r1;
280 isc_region_consume(&r2, 2);
281 r1.length = 2;
282 RETERR((digest)(arg, &r1));
283 dns_name_init(&name, NULL);
284 dns_name_fromregion(&name, &r2);
285 return (dns_name_digest(&name, digest, arg));
286 }
287
288 static inline isc_boolean_t
checkowner_mx(ARGS_CHECKOWNER)289 checkowner_mx(ARGS_CHECKOWNER) {
290
291 REQUIRE(type == 15);
292
293 UNUSED(type);
294 UNUSED(rdclass);
295
296 return (dns_name_ishostname(name, wildcard));
297 }
298
299 static inline isc_boolean_t
checknames_mx(ARGS_CHECKNAMES)300 checknames_mx(ARGS_CHECKNAMES) {
301 isc_region_t region;
302 dns_name_t name;
303
304 REQUIRE(rdata->type == 15);
305
306 UNUSED(owner);
307
308 dns_rdata_toregion(rdata, ®ion);
309 isc_region_consume(®ion, 2);
310 dns_name_init(&name, NULL);
311 dns_name_fromregion(&name, ®ion);
312 if (!dns_name_ishostname(&name, ISC_FALSE)) {
313 if (bad != NULL)
314 dns_name_clone(&name, bad);
315 return (ISC_FALSE);
316 }
317 return (ISC_TRUE);
318 }
319
320 static inline int
casecompare_mx(ARGS_COMPARE)321 casecompare_mx(ARGS_COMPARE) {
322 return (compare_mx(rdata1, rdata2));
323 }
324
325 #endif /* RDATA_GENERIC_MX_15_C */
326