1 /*
2 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /* $Id: nxt_30.c,v 1.13 2020/09/14 08:40:43 florian Exp $ */
18
19 /* reviewed: Wed Mar 15 18:21:15 PST 2000 by brister */
20
21 /* RFC2535 */
22
23 #ifndef RDATA_GENERIC_NXT_30_C
24 #define RDATA_GENERIC_NXT_30_C
25
26 /*
27 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
28 * because we must be able to handle a parent/child NXT pair.
29 */
30
31 static inline isc_result_t
totext_nxt(ARGS_TOTEXT)32 totext_nxt(ARGS_TOTEXT) {
33 isc_region_t sr;
34 unsigned int i, j;
35 dns_name_t name;
36 dns_name_t prefix;
37 int sub;
38
39 REQUIRE(rdata->type == dns_rdatatype_nxt);
40 REQUIRE(rdata->length != 0);
41
42 dns_name_init(&name, NULL);
43 dns_name_init(&prefix, NULL);
44 dns_rdata_toregion(rdata, &sr);
45 dns_name_fromregion(&name, &sr);
46 isc_region_consume(&sr, name_length(&name));
47 sub = name_prefix(&name, tctx->origin, &prefix);
48 RETERR(dns_name_totext(&prefix, sub, target));
49
50 for (i = 0; i < sr.length; i++) {
51 if (sr.base[i] != 0)
52 for (j = 0; j < 8; j++)
53 if ((sr.base[i] & (0x80 >> j)) != 0) {
54 dns_rdatatype_t t = i * 8 + j;
55 RETERR(isc_str_tobuffer(" ", target));
56 RETERR(dns_rdatatype_totext(t, target));
57 }
58 }
59 return (ISC_R_SUCCESS);
60 }
61
62 static inline isc_result_t
fromwire_nxt(ARGS_FROMWIRE)63 fromwire_nxt(ARGS_FROMWIRE) {
64 isc_region_t sr;
65 dns_name_t name;
66
67 REQUIRE(type == dns_rdatatype_nxt);
68
69 UNUSED(type);
70 UNUSED(rdclass);
71
72 dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
73
74 dns_name_init(&name, NULL);
75 RETERR(dns_name_fromwire(&name, source, dctx, options, target));
76
77 isc_buffer_activeregion(source, &sr);
78 if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&
79 ((sr.length > 16) || sr.base[sr.length - 1] == 0))
80 return (DNS_R_BADBITMAP);
81 RETERR(isc_mem_tobuffer(target, sr.base, sr.length));
82 isc_buffer_forward(source, sr.length);
83 return (ISC_R_SUCCESS);
84 }
85
86 static inline isc_result_t
towire_nxt(ARGS_TOWIRE)87 towire_nxt(ARGS_TOWIRE) {
88 isc_region_t sr;
89 dns_name_t name;
90 dns_offsets_t offsets;
91
92 REQUIRE(rdata->type == dns_rdatatype_nxt);
93 REQUIRE(rdata->length != 0);
94
95 dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
96 dns_name_init(&name, offsets);
97 dns_rdata_toregion(rdata, &sr);
98 dns_name_fromregion(&name, &sr);
99 isc_region_consume(&sr, name_length(&name));
100 RETERR(dns_name_towire(&name, cctx, target));
101
102 return (isc_mem_tobuffer(target, sr.base, sr.length));
103 }
104
105 #endif /* RDATA_GENERIC_NXT_30_C */
106