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 #ifndef GENERIC_CAA_257_C
18 #define GENERIC_CAA_257_C 1
19
20 static unsigned char const alphanumeric[256] = {
21 /* 0x00-0x0f */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
22 /* 0x10-0x1f */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
23 /* 0x20-0x2f */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
24 /* 0x30-0x3f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
25 /* 0x40-0x4f */ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
26 /* 0x50-0x5f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
27 /* 0x60-0x6f */ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
28 /* 0x70-0x7f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
29 /* 0x80-0x8f */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
30 /* 0x90-0x9f */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
31 /* 0xa0-0xaf */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
32 /* 0xb0-0xbf */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33 /* 0xc0-0xcf */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
34 /* 0xd0-0xdf */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
35 /* 0xe0-0xef */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
36 /* 0xf0-0xff */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
37 };
38
39 static inline isc_result_t
totext_caa(ARGS_TOTEXT)40 totext_caa(ARGS_TOTEXT) {
41 isc_region_t region;
42 uint8_t flags;
43 char buf[256];
44
45 UNUSED(tctx);
46
47 REQUIRE(rdata->type == dns_rdatatype_caa);
48 REQUIRE(rdata->length >= 3U);
49 REQUIRE(rdata->data != NULL);
50
51 dns_rdata_toregion(rdata, ®ion);
52
53 /*
54 * Flags
55 */
56 flags = uint8_consume_fromregion(®ion);
57 snprintf(buf, sizeof(buf), "%u ", flags);
58 RETERR(isc_str_tobuffer(buf, target));
59
60 /*
61 * Tag
62 */
63 RETERR(txt_totext(®ion, 0, target));
64 RETERR(isc_str_tobuffer(" ", target));
65
66 /*
67 * Value
68 */
69 RETERR(multitxt_totext(®ion, target));
70 return (ISC_R_SUCCESS);
71 }
72
73 static inline isc_result_t
fromwire_caa(ARGS_FROMWIRE)74 fromwire_caa(ARGS_FROMWIRE) {
75 isc_region_t sr;
76 unsigned int len, i;
77
78 REQUIRE(type == dns_rdatatype_caa);
79
80 UNUSED(type);
81 UNUSED(rdclass);
82 UNUSED(dctx);
83 UNUSED(options);
84
85 /*
86 * Flags
87 */
88 isc_buffer_activeregion(source, &sr);
89 if (sr.length < 2)
90 return (ISC_R_UNEXPECTEDEND);
91
92 /*
93 * Flags, tag length
94 */
95 RETERR(isc_mem_tobuffer(target, sr.base, 2));
96 len = sr.base[1];
97 isc_region_consume(&sr, 2);
98 isc_buffer_forward(source, 2);
99
100 /*
101 * Zero length tag fields are illegal.
102 */
103 if (sr.length < len || len == 0)
104 return (DNS_R_FORMERR);
105
106 /* Check the Tag's value */
107 for (i = 0; i < len; i++)
108 if (!alphanumeric[sr.base[i]])
109 return (DNS_R_FORMERR);
110 /*
111 * Tag + Value
112 */
113 isc_buffer_forward(source, sr.length);
114 return (isc_mem_tobuffer(target, sr.base, sr.length));
115 }
116
117 static inline isc_result_t
towire_caa(ARGS_TOWIRE)118 towire_caa(ARGS_TOWIRE) {
119 isc_region_t region;
120
121 REQUIRE(rdata->type == dns_rdatatype_caa);
122 REQUIRE(rdata->length >= 3U);
123 REQUIRE(rdata->data != NULL);
124
125 UNUSED(cctx);
126
127 dns_rdata_toregion(rdata, ®ion);
128 return (isc_mem_tobuffer(target, region.base, region.length));
129 }
130
131 #endif /* GENERIC_CAA_257_C */
132