1 /*
2  * Copyright (C) 2004, 2005, 2007, 2009, 2015  Internet Systems Consortium, Inc. ("ISC")
3  * Copyright (C) 1999-2003  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: nxt_30.c,v 1.65 2009/12/04 22:06:37 tbox Exp $ */
19 
20 /* reviewed: Wed Mar 15 18:21:15 PST 2000 by brister */
21 
22 /* RFC2535 */
23 
24 #ifndef RDATA_GENERIC_NXT_30_C
25 #define RDATA_GENERIC_NXT_30_C
26 
27 /*
28  * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
29  * because we must be able to handle a parent/child NXT pair.
30  */
31 #define RRTYPE_NXT_ATTRIBUTES (0)
32 
33 static inline isc_result_t
fromtext_nxt(ARGS_FROMTEXT)34 fromtext_nxt(ARGS_FROMTEXT) {
35 	isc_token_t token;
36 	dns_name_t name;
37 	isc_buffer_t buffer;
38 	char *e;
39 	unsigned char bm[8*1024]; /* 64k bits */
40 	dns_rdatatype_t covered;
41 	dns_rdatatype_t maxcovered = 0;
42 	isc_boolean_t first = ISC_TRUE;
43 	long n;
44 
45 	REQUIRE(type == dns_rdatatype_nxt);
46 
47 	UNUSED(type);
48 	UNUSED(rdclass);
49 	UNUSED(callbacks);
50 
51 	/*
52 	 * Next domain.
53 	 */
54 	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
55 				      ISC_FALSE));
56 	dns_name_init(&name, NULL);
57 	buffer_fromregion(&buffer, &token.value.as_region);
58 	if (origin == NULL)
59 		origin = dns_rootname;
60 	RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
61 
62 	memset(bm, 0, sizeof(bm));
63 	do {
64 		RETERR(isc_lex_getmastertoken(lexer, &token,
65 					      isc_tokentype_string, ISC_TRUE));
66 		if (token.type != isc_tokentype_string)
67 			break;
68 		n = strtol(DNS_AS_STR(token), &e, 10);
69 		if (e != DNS_AS_STR(token) && *e == '\0') {
70 			covered = (dns_rdatatype_t)n;
71 		} else if (dns_rdatatype_fromtext(&covered,
72 				&token.value.as_textregion) == DNS_R_UNKNOWN)
73 			RETTOK(DNS_R_UNKNOWN);
74 		/*
75 		 * NXT is only specified for types 1..127.
76 		 */
77 		if (covered < 1 || covered > 127)
78 			return (ISC_R_RANGE);
79 		if (first || covered > maxcovered)
80 			maxcovered = covered;
81 		first = ISC_FALSE;
82 		bm[covered/8] |= (0x80>>(covered%8));
83 	} while (1);
84 	isc_lex_ungettoken(lexer, &token);
85 	if (first)
86 		return (ISC_R_SUCCESS);
87 	n = (maxcovered + 8) / 8;
88 	return (mem_tobuffer(target, bm, n));
89 }
90 
91 static inline isc_result_t
totext_nxt(ARGS_TOTEXT)92 totext_nxt(ARGS_TOTEXT) {
93 	isc_region_t sr;
94 	unsigned int i, j;
95 	dns_name_t name;
96 	dns_name_t prefix;
97 	isc_boolean_t sub;
98 
99 	REQUIRE(rdata->type == dns_rdatatype_nxt);
100 	REQUIRE(rdata->length != 0);
101 
102 	dns_name_init(&name, NULL);
103 	dns_name_init(&prefix, NULL);
104 	dns_rdata_toregion(rdata, &sr);
105 	dns_name_fromregion(&name, &sr);
106 	isc_region_consume(&sr, name_length(&name));
107 	sub = name_prefix(&name, tctx->origin, &prefix);
108 	RETERR(dns_name_totext(&prefix, sub, target));
109 
110 	for (i = 0; i < sr.length; i++) {
111 		if (sr.base[i] != 0)
112 			for (j = 0; j < 8; j++)
113 				if ((sr.base[i] & (0x80 >> j)) != 0) {
114 					dns_rdatatype_t t = i * 8 + j;
115 					RETERR(str_totext(" ", target));
116 					if (dns_rdatatype_isknown(t)) {
117 						RETERR(dns_rdatatype_totext(t,
118 								      target));
119 					} else {
120 						char buf[sizeof("65535")];
121 						sprintf(buf, "%u", t);
122 						RETERR(str_totext(buf,
123 								  target));
124 					}
125 				}
126 	}
127 	return (ISC_R_SUCCESS);
128 }
129 
130 static inline isc_result_t
fromwire_nxt(ARGS_FROMWIRE)131 fromwire_nxt(ARGS_FROMWIRE) {
132 	isc_region_t sr;
133 	dns_name_t name;
134 
135 	REQUIRE(type == dns_rdatatype_nxt);
136 
137 	UNUSED(type);
138 	UNUSED(rdclass);
139 
140 	dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
141 
142 	dns_name_init(&name, NULL);
143 	RETERR(dns_name_fromwire(&name, source, dctx, options, target));
144 
145 	isc_buffer_activeregion(source, &sr);
146 	if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&
147 	    ((sr.length > 16) || sr.base[sr.length - 1] == 0))
148 		return (DNS_R_BADBITMAP);
149 	RETERR(mem_tobuffer(target, sr.base, sr.length));
150 	isc_buffer_forward(source, sr.length);
151 	return (ISC_R_SUCCESS);
152 }
153 
154 static inline isc_result_t
towire_nxt(ARGS_TOWIRE)155 towire_nxt(ARGS_TOWIRE) {
156 	isc_region_t sr;
157 	dns_name_t name;
158 	dns_offsets_t offsets;
159 
160 	REQUIRE(rdata->type == dns_rdatatype_nxt);
161 	REQUIRE(rdata->length != 0);
162 
163 	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
164 	dns_name_init(&name, offsets);
165 	dns_rdata_toregion(rdata, &sr);
166 	dns_name_fromregion(&name, &sr);
167 	isc_region_consume(&sr, name_length(&name));
168 	RETERR(dns_name_towire(&name, cctx, target));
169 
170 	return (mem_tobuffer(target, sr.base, sr.length));
171 }
172 
173 static inline int
compare_nxt(ARGS_COMPARE)174 compare_nxt(ARGS_COMPARE) {
175 	isc_region_t r1;
176 	isc_region_t r2;
177 	dns_name_t name1;
178 	dns_name_t name2;
179 	int order;
180 
181 	REQUIRE(rdata1->type == rdata2->type);
182 	REQUIRE(rdata1->rdclass == rdata2->rdclass);
183 	REQUIRE(rdata1->type == dns_rdatatype_nxt);
184 	REQUIRE(rdata1->length != 0);
185 	REQUIRE(rdata2->length != 0);
186 
187 	dns_name_init(&name1, NULL);
188 	dns_name_init(&name2, NULL);
189 	dns_rdata_toregion(rdata1, &r1);
190 	dns_rdata_toregion(rdata2, &r2);
191 	dns_name_fromregion(&name1, &r1);
192 	dns_name_fromregion(&name2, &r2);
193 	order = dns_name_rdatacompare(&name1, &name2);
194 	if (order != 0)
195 		return (order);
196 
197 	return (isc_region_compare(&r1, &r2));
198 }
199 
200 static inline isc_result_t
fromstruct_nxt(ARGS_FROMSTRUCT)201 fromstruct_nxt(ARGS_FROMSTRUCT) {
202 	dns_rdata_nxt_t *nxt = source;
203 	isc_region_t region;
204 
205 	REQUIRE(type == dns_rdatatype_nxt);
206 	REQUIRE(source != NULL);
207 	REQUIRE(nxt->common.rdtype == type);
208 	REQUIRE(nxt->common.rdclass == rdclass);
209 	REQUIRE(nxt->typebits != NULL || nxt->len == 0);
210 	if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) {
211 		REQUIRE(nxt->len <= 16);
212 		REQUIRE(nxt->typebits[nxt->len - 1] != 0);
213 	}
214 
215 	UNUSED(type);
216 	UNUSED(rdclass);
217 
218 	dns_name_toregion(&nxt->next, &region);
219 	RETERR(isc_buffer_copyregion(target, &region));
220 
221 	return (mem_tobuffer(target, nxt->typebits, nxt->len));
222 }
223 
224 static inline isc_result_t
tostruct_nxt(ARGS_TOSTRUCT)225 tostruct_nxt(ARGS_TOSTRUCT) {
226 	isc_region_t region;
227 	dns_rdata_nxt_t *nxt = target;
228 	dns_name_t name;
229 
230 	REQUIRE(rdata->type == dns_rdatatype_nxt);
231 	REQUIRE(target != NULL);
232 	REQUIRE(rdata->length != 0);
233 
234 	nxt->common.rdclass = rdata->rdclass;
235 	nxt->common.rdtype = rdata->type;
236 	ISC_LINK_INIT(&nxt->common, link);
237 
238 	dns_name_init(&name, NULL);
239 	dns_rdata_toregion(rdata, &region);
240 	dns_name_fromregion(&name, &region);
241 	isc_region_consume(&region, name_length(&name));
242 	dns_name_init(&nxt->next, NULL);
243 	RETERR(name_duporclone(&name, mctx, &nxt->next));
244 
245 	nxt->len = region.length;
246 	nxt->typebits = mem_maybedup(mctx, region.base, region.length);
247 	if (nxt->typebits == NULL)
248 		goto cleanup;
249 
250 	nxt->mctx = mctx;
251 	return (ISC_R_SUCCESS);
252 
253  cleanup:
254 	if (mctx != NULL)
255 		dns_name_free(&nxt->next, mctx);
256 	return (ISC_R_NOMEMORY);
257 }
258 
259 static inline void
freestruct_nxt(ARGS_FREESTRUCT)260 freestruct_nxt(ARGS_FREESTRUCT) {
261 	dns_rdata_nxt_t *nxt = source;
262 
263 	REQUIRE(source != NULL);
264 	REQUIRE(nxt->common.rdtype == dns_rdatatype_nxt);
265 
266 	if (nxt->mctx == NULL)
267 		return;
268 
269 	dns_name_free(&nxt->next, nxt->mctx);
270 	if (nxt->typebits != NULL)
271 		isc_mem_free(nxt->mctx, nxt->typebits);
272 	nxt->mctx = NULL;
273 }
274 
275 static inline isc_result_t
additionaldata_nxt(ARGS_ADDLDATA)276 additionaldata_nxt(ARGS_ADDLDATA) {
277 	REQUIRE(rdata->type == dns_rdatatype_nxt);
278 
279 	UNUSED(rdata);
280 	UNUSED(add);
281 	UNUSED(arg);
282 
283 	return (ISC_R_SUCCESS);
284 }
285 
286 static inline isc_result_t
digest_nxt(ARGS_DIGEST)287 digest_nxt(ARGS_DIGEST) {
288 	isc_region_t r;
289 	dns_name_t name;
290 	isc_result_t result;
291 
292 	REQUIRE(rdata->type == dns_rdatatype_nxt);
293 
294 	dns_rdata_toregion(rdata, &r);
295 	dns_name_init(&name, NULL);
296 	dns_name_fromregion(&name, &r);
297 	result = dns_name_digest(&name, digest, arg);
298 	if (result != ISC_R_SUCCESS)
299 		return (result);
300 	isc_region_consume(&r, name_length(&name));
301 
302 	return ((digest)(arg, &r));
303 }
304 
305 static inline isc_boolean_t
checkowner_nxt(ARGS_CHECKOWNER)306 checkowner_nxt(ARGS_CHECKOWNER) {
307 
308 	REQUIRE(type == dns_rdatatype_nxt);
309 
310 	UNUSED(name);
311 	UNUSED(type);
312 	UNUSED(rdclass);
313 	UNUSED(wildcard);
314 
315 	return (ISC_TRUE);
316 }
317 
318 static inline isc_boolean_t
checknames_nxt(ARGS_CHECKNAMES)319 checknames_nxt(ARGS_CHECKNAMES) {
320 
321 	REQUIRE(rdata->type == dns_rdatatype_nxt);
322 
323 	UNUSED(rdata);
324 	UNUSED(owner);
325 	UNUSED(bad);
326 
327 	return (ISC_TRUE);
328 }
329 
330 static inline int
casecompare_nxt(ARGS_COMPARE)331 casecompare_nxt(ARGS_COMPARE) {
332 	return (compare_nxt(rdata1, rdata2));
333 }
334 #endif	/* RDATA_GENERIC_NXT_30_C */
335