1 /*
2 * Copyright (C) 2004, 2005, 2007, 2009, 2012, 2015 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
31 static isc_boolean_t
check_mx(isc_token_t * token)32 check_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
49 static inline isc_result_t
fromtext_mx(ARGS_FROMTEXT)50 fromtext_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 == dns_rdatatype_mx);
57
58 UNUSED(type);
59 UNUSED(rdclass);
60
61 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
62 ISC_FALSE));
63 if (token.value.as_ulong > 0xffffU)
64 RETTOK(ISC_R_RANGE);
65 RETERR(uint16_tobuffer(token.value.as_ulong, target));
66
67 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
68 ISC_FALSE));
69
70 ok = ISC_TRUE;
71 if ((options & DNS_RDATA_CHECKMX) != 0)
72 ok = check_mx(&token);
73 if (!ok && (options & DNS_RDATA_CHECKMXFAIL) != 0)
74 RETTOK(DNS_R_MXISADDRESS);
75 if (!ok && callbacks != NULL)
76 warn_badmx(&token, lexer, callbacks);
77
78 dns_name_init(&name, NULL);
79 buffer_fromregion(&buffer, &token.value.as_region);
80 if (origin == NULL)
81 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
93 static inline isc_result_t
totext_mx(ARGS_TOTEXT)94 totext_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 == dns_rdatatype_mx);
103 REQUIRE(rdata->length != 0);
104
105 dns_name_init(&name, NULL);
106 dns_name_init(&prefix, NULL);
107
108 dns_rdata_toregion(rdata, ®ion);
109 num = uint16_fromregion(®ion);
110 isc_region_consume(®ion, 2);
111 sprintf(buf, "%u", num);
112 RETERR(str_totext(buf, target));
113
114 RETERR(str_totext(" ", target));
115
116 dns_name_fromregion(&name, ®ion);
117 sub = name_prefix(&name, tctx->origin, &prefix);
118 return (dns_name_totext(&prefix, sub, target));
119 }
120
121 static inline isc_result_t
fromwire_mx(ARGS_FROMWIRE)122 fromwire_mx(ARGS_FROMWIRE) {
123 dns_name_t name;
124 isc_region_t sregion;
125
126 REQUIRE(type == dns_rdatatype_mx);
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
143 static inline isc_result_t
towire_mx(ARGS_TOWIRE)144 towire_mx(ARGS_TOWIRE) {
145 dns_name_t name;
146 dns_offsets_t offsets;
147 isc_region_t region;
148
149 REQUIRE(rdata->type == dns_rdatatype_mx);
150 REQUIRE(rdata->length != 0);
151
152 dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
153
154 dns_rdata_toregion(rdata, ®ion);
155 RETERR(mem_tobuffer(target, region.base, 2));
156 isc_region_consume(®ion, 2);
157
158 dns_name_init(&name, offsets);
159 dns_name_fromregion(&name, ®ion);
160
161 return (dns_name_towire(&name, cctx, target));
162 }
163
164 static inline int
compare_mx(ARGS_COMPARE)165 compare_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 == dns_rdatatype_mx);
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, ®ion1);
186 dns_rdata_toregion(rdata2, ®ion2);
187
188 isc_region_consume(®ion1, 2);
189 isc_region_consume(®ion2, 2);
190
191 dns_name_fromregion(&name1, ®ion1);
192 dns_name_fromregion(&name2, ®ion2);
193
194 return (dns_name_rdatacompare(&name1, &name2));
195 }
196
197 static inline isc_result_t
fromstruct_mx(ARGS_FROMSTRUCT)198 fromstruct_mx(ARGS_FROMSTRUCT) {
199 dns_rdata_mx_t *mx = source;
200 isc_region_t region;
201
202 REQUIRE(type == dns_rdatatype_mx);
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, ®ion);
212 return (isc_buffer_copyregion(target, ®ion));
213 }
214
215 static inline isc_result_t
tostruct_mx(ARGS_TOSTRUCT)216 tostruct_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 == dns_rdatatype_mx);
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, ®ion);
231 mx->pref = uint16_fromregion(®ion);
232 isc_region_consume(®ion, 2);
233 dns_name_fromregion(&name, ®ion);
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
240 static inline void
freestruct_mx(ARGS_FREESTRUCT)241 freestruct_mx(ARGS_FREESTRUCT) {
242 dns_rdata_mx_t *mx = source;
243
244 REQUIRE(source != NULL);
245 REQUIRE(mx->common.rdtype == dns_rdatatype_mx);
246
247 if (mx->mctx == NULL)
248 return;
249
250 dns_name_free(&mx->mx, mx->mctx);
251 mx->mctx = NULL;
252 }
253
254 static inline isc_result_t
additionaldata_mx(ARGS_ADDLDATA)255 additionaldata_mx(ARGS_ADDLDATA) {
256 dns_name_t name;
257 dns_offsets_t offsets;
258 isc_region_t region;
259
260 REQUIRE(rdata->type == dns_rdatatype_mx);
261
262 dns_name_init(&name, offsets);
263 dns_rdata_toregion(rdata, ®ion);
264 isc_region_consume(®ion, 2);
265 dns_name_fromregion(&name, ®ion);
266
267 return ((add)(arg, &name, dns_rdatatype_a));
268 }
269
270 static inline isc_result_t
digest_mx(ARGS_DIGEST)271 digest_mx(ARGS_DIGEST) {
272 isc_region_t r1, r2;
273 dns_name_t name;
274
275 REQUIRE(rdata->type == dns_rdatatype_mx);
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
287 static inline isc_boolean_t
checkowner_mx(ARGS_CHECKOWNER)288 checkowner_mx(ARGS_CHECKOWNER) {
289
290 REQUIRE(type == dns_rdatatype_mx);
291
292 UNUSED(type);
293 UNUSED(rdclass);
294
295 return (dns_name_ishostname(name, wildcard));
296 }
297
298 static inline isc_boolean_t
checknames_mx(ARGS_CHECKNAMES)299 checknames_mx(ARGS_CHECKNAMES) {
300 isc_region_t region;
301 dns_name_t name;
302
303 REQUIRE(rdata->type == dns_rdatatype_mx);
304
305 UNUSED(owner);
306
307 dns_rdata_toregion(rdata, ®ion);
308 isc_region_consume(®ion, 2);
309 dns_name_init(&name, NULL);
310 dns_name_fromregion(&name, ®ion);
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
319 static inline int
casecompare_mx(ARGS_COMPARE)320 casecompare_mx(ARGS_COMPARE) {
321 return (compare_mx(rdata1, rdata2));
322 }
323
324 #endif /* RDATA_GENERIC_MX_15_C */
325