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1 /*
2  * Copyright (C) 2004, 2005, 2007, 2009, 2011-2014  Internet Systems Consortium, Inc. ("ISC")
3  * Copyright (C) 1998-2002  Internet Software Consortium.
4  *
5  * Permission to use, copy, modify, and/or distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15  * PERFORMANCE OF THIS SOFTWARE.
16  */
17
18 /* $Id$ */
19
20 /* Reviewed: Thu Mar 16 14:06:44 PST 2000 by gson */
21
22 /* RFC2671 */
23
24 #ifndef RDATA_GENERIC_OPT_41_C
25 #define RDATA_GENERIC_OPT_41_C
26
27 #define RRTYPE_OPT_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON | \
28                                DNS_RDATATYPEATTR_META | \
29                                DNS_RDATATYPEATTR_NOTQUESTION)
30
31 static inline isc_result_t
32 fromtext_opt(ARGS_FROMTEXT) {
33         /*
34          * OPT records do not have a text format.
35          */
36
37         REQUIRE(type == 41);
38
39         UNUSED(type);
40         UNUSED(rdclass);
41         UNUSED(lexer);
42         UNUSED(origin);
43         UNUSED(options);
44         UNUSED(target);
45         UNUSED(callbacks);
46
47         return (ISC_R_NOTIMPLEMENTED);
48 }
49
50 static inline isc_result_t
51 totext_opt(ARGS_TOTEXT) {
52         isc_region_t r;
53         isc_region_t or;
54         isc_uint16_t option;
55         isc_uint16_t length;
56         char buf[sizeof("64000 64000")];
57
58         /*
59          * OPT records do not have a text format.
60          */
61
62         REQUIRE(rdata->type == 41);
63
64         dns_rdata_toregion(rdata, &r);
65         while (r.length > 0) {
66                 option = uint16_fromregion(&r);
67                 isc_region_consume(&r, 2);
68                 length = uint16_fromregion(&r);
69                 isc_region_consume(&r, 2);
70                 sprintf(buf, "%u %u", option, length);
71                 RETERR(str_totext(buf, target));
72                 INSIST(r.length >= length);
73                 if (length > 0) {
74                         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
75                                 RETERR(str_totext(" (", target));
76                         RETERR(str_totext(tctx->linebreak, target));
77                         or = r;
78                         or.length = length;
79                         if (tctx->width == 0)   /* No splitting */
80                                 RETERR(isc_base64_totext(&or, 60, "", target));
81                         else
82                                 RETERR(isc_base64_totext(&or, tctx->width - 2,
83                                                          tctx->linebreak,
84                                                          target));
85                         isc_region_consume(&r, length);
86                         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
87                                 RETERR(str_totext(" )", target));
88                 }
89                 if (r.length > 0)
90                         RETERR(str_totext(" ", target));
91         }
92
93         return (ISC_R_SUCCESS);
94 }
95
96 static inline isc_result_t
97 fromwire_opt(ARGS_FROMWIRE) {
98         isc_region_t sregion;
99         isc_region_t tregion;
100         isc_uint16_t opt;
101         isc_uint16_t length;
102         unsigned int total;
103
104         REQUIRE(type == 41);
105
106         UNUSED(type);
107         UNUSED(rdclass);
108         UNUSED(dctx);
109         UNUSED(options);
110
111         isc_buffer_activeregion(source, &sregion);
112         total = 0;
113         while (sregion.length != 0) {
114                 if (sregion.length < 4)
115                         return (ISC_R_UNEXPECTEDEND);
116                 opt = uint16_fromregion(&sregion);
117                 isc_region_consume(&sregion, 2);
118                 length = uint16_fromregion(&sregion);
119                 isc_region_consume(&sregion, 2);
120                 total += 4;
121                 if (sregion.length < length)
122                         return (ISC_R_UNEXPECTEDEND);
123                 switch (opt) {
124                 case DNS_OPT_CLIENT_SUBNET: {
125                         isc_uint16_t family;
126                         isc_uint8_t addrlen;
127                         isc_uint8_t scope;
128                         isc_uint8_t addrbytes;
129
130                         if (length < 4)
131                                 return (DNS_R_FORMERR);
132                         family = uint16_fromregion(&sregion);
133                         isc_region_consume(&sregion, 2);
134                         addrlen = uint8_fromregion(&sregion);
135                         isc_region_consume(&sregion, 1);
136                         scope = uint8_fromregion(&sregion);
137                         isc_region_consume(&sregion, 1);
138                         switch (family) {
139                         case 1:
140                                 if (addrlen > 32U || scope > 32U)
141                                         return (DNS_R_FORMERR);
142                                 break;
143                         case 2:
144                                 if (addrlen > 128U || scope > 128U)
145                                         return (DNS_R_FORMERR);
146                                 break;
147                         }
148                         addrbytes = (addrlen + 7) / 8;
149                         if (addrbytes + 4 != length)
150                                 return (DNS_R_FORMERR);
151                         isc_region_consume(&sregion, addrbytes);
152                         break;
153                 }
154                 case DNS_OPT_EXPIRE:
155                         /*
156                          * Request has zero length.  Response is 32 bits.
157                          */
158                         if (length != 0 && length != 4)
159                                 return (DNS_R_FORMERR);
160                         isc_region_consume(&sregion, length);
161                         break;
162                 default:
163                         isc_region_consume(&sregion, length);
164                         break;
165                 }
166                 total += length;
167         }
168
169         isc_buffer_activeregion(source, &sregion);
170         isc_buffer_availableregion(target, &tregion);
171         if (tregion.length < total)
172                 return (ISC_R_NOSPACE);
173         memmove(tregion.base, sregion.base, total);
174         isc_buffer_forward(source, total);
175         isc_buffer_add(target, total);
176
177         return (ISC_R_SUCCESS);
178 }
179
180 static inline isc_result_t
181 towire_opt(ARGS_TOWIRE) {
182
183         REQUIRE(rdata->type == 41);
184
185         UNUSED(cctx);
186
187         return (mem_tobuffer(target, rdata->data, rdata->length));
188 }
189
190 static inline int
191 compare_opt(ARGS_COMPARE) {
192         isc_region_t r1;
193         isc_region_t r2;
194
195         REQUIRE(rdata1->type == rdata2->type);
196         REQUIRE(rdata1->rdclass == rdata2->rdclass);
197         REQUIRE(rdata1->type == 41);
198
199         dns_rdata_toregion(rdata1, &r1);
200         dns_rdata_toregion(rdata2, &r2);
201         return (isc_region_compare(&r1, &r2));
202 }
203
204 static inline isc_result_t
205 fromstruct_opt(ARGS_FROMSTRUCT) {
206         dns_rdata_opt_t *opt = source;
207         isc_region_t region;
208         isc_uint16_t length;
209
210         REQUIRE(type == 41);
211         REQUIRE(source != NULL);
212         REQUIRE(opt->common.rdtype == type);
213         REQUIRE(opt->common.rdclass == rdclass);
214         REQUIRE(opt->options != NULL || opt->length == 0);
215
216         UNUSED(type);
217         UNUSED(rdclass);
218
219         region.base = opt->options;
220         region.length = opt->length;
221         while (region.length >= 4) {
222                 isc_region_consume(&region, 2); /* opt */
223                 length = uint16_fromregion(&region);
224                 isc_region_consume(&region, 2);
225                 if (region.length < length)
226                         return (ISC_R_UNEXPECTEDEND);
227                 isc_region_consume(&region, length);
228         }
229         if (region.length != 0)
230                 return (ISC_R_UNEXPECTEDEND);
231
232         return (mem_tobuffer(target, opt->options, opt->length));
233 }
234
235 static inline isc_result_t
236 tostruct_opt(ARGS_TOSTRUCT) {
237         dns_rdata_opt_t *opt = target;
238         isc_region_t r;
239
240         REQUIRE(rdata->type == 41);
241         REQUIRE(target != NULL);
242
243         opt->common.rdclass = rdata->rdclass;
244         opt->common.rdtype = rdata->type;
245         ISC_LINK_INIT(&opt->common, link);
246
247         dns_rdata_toregion(rdata, &r);
248         opt->length = r.length;
249         opt->options = mem_maybedup(mctx, r.base, r.length);
250         if (opt->options == NULL)
251                 return (ISC_R_NOMEMORY);
252
253         opt->offset = 0;
254         opt->mctx = mctx;
255         return (ISC_R_SUCCESS);
256 }
257
258 static inline void
259 freestruct_opt(ARGS_FREESTRUCT) {
260         dns_rdata_opt_t *opt = source;
261
262         REQUIRE(source != NULL);
263         REQUIRE(opt->common.rdtype == 41);
264
265         if (opt->mctx == NULL)
266                 return;
267
268         if (opt->options != NULL)
269                 isc_mem_free(opt->mctx, opt->options);
270         opt->mctx = NULL;
271 }
272
273 static inline isc_result_t
274 additionaldata_opt(ARGS_ADDLDATA) {
275         REQUIRE(rdata->type == 41);
276
277         UNUSED(rdata);
278         UNUSED(add);
279         UNUSED(arg);
280
281         return (ISC_R_SUCCESS);
282 }
283
284 static inline isc_result_t
285 digest_opt(ARGS_DIGEST) {
286
287         /*
288          * OPT records are not digested.
289          */
290
291         REQUIRE(rdata->type == 41);
292
293         UNUSED(rdata);
294         UNUSED(digest);
295         UNUSED(arg);
296
297         return (ISC_R_NOTIMPLEMENTED);
298 }
299
300 static inline isc_boolean_t
301 checkowner_opt(ARGS_CHECKOWNER) {
302
303         REQUIRE(type == 41);
304
305         UNUSED(type);
306         UNUSED(rdclass);
307         UNUSED(wildcard);
308
309         return (dns_name_equal(name, dns_rootname));
310 }
311
312 static inline isc_boolean_t
313 checknames_opt(ARGS_CHECKNAMES) {
314
315         REQUIRE(rdata->type == 41);
316
317         UNUSED(rdata);
318         UNUSED(owner);
319         UNUSED(bad);
320
321         return (ISC_TRUE);
322 }
323
324 static inline int
325 casecompare_opt(ARGS_COMPARE) {
326         return (compare_opt(rdata1, rdata2));
327 }
328
329 #endif  /* RDATA_GENERIC_OPT_41_C */