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: zonemd_63.c,v 1.2 2022/12/26 19:24:11 jmc Exp $ */
18
19 /* RFC8976 */
20
21 #ifndef RDATA_GENERIC_ZONEMD_63_C
22 #define RDATA_GENERIC_ZONEMD_63_C
23
24 #define DNS_ZONEMD_DIGEST_SHA384 (1)
25
26 static inline isc_result_t
totext_zonemd(ARGS_TOTEXT)27 totext_zonemd(ARGS_TOTEXT) {
28 isc_region_t sr;
29 char buf[sizeof("4294967295 ")];
30 uint32_t n;
31
32 REQUIRE(rdata->type == dns_rdatatype_zonemd);
33 REQUIRE(rdata->length > 6);
34
35 dns_rdata_toregion(rdata, &sr);
36
37 /* serial */
38 n = uint32_fromregion(&sr);
39 isc_region_consume(&sr, 4);
40 snprintf(buf, sizeof(buf), "%u ", n);
41 RETERR(isc_str_tobuffer(buf, target));
42
43 /* scheme */
44 n = uint8_fromregion(&sr);
45 isc_region_consume(&sr, 1);
46 snprintf(buf, sizeof(buf), "%u ", n);
47 RETERR(isc_str_tobuffer(buf, target));
48
49 /* hash algo */
50 n = uint8_fromregion(&sr);
51 isc_region_consume(&sr, 1);
52 snprintf(buf, sizeof(buf), "%u", n);
53 RETERR(isc_str_tobuffer(buf, target));
54
55 /* Digest */
56 if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
57 RETERR(isc_str_tobuffer(" (", target));
58 RETERR(isc_str_tobuffer(tctx->linebreak, target));
59 if ((tctx->flags & DNS_STYLEFLAG_NOCRYPTO) == 0) {
60 if (tctx->width == 0) /* No splitting */
61 RETERR(isc_hex_totext(&sr, 0, "", target));
62 else
63 RETERR(isc_hex_totext(&sr, tctx->width - 2,
64 tctx->linebreak, target));
65 } else
66 RETERR(isc_str_tobuffer("[omitted]", target));
67 if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
68 RETERR(isc_str_tobuffer(" )", target));
69 return (ISC_R_SUCCESS);
70 }
71
72 static inline isc_result_t
fromwire_zonemd(ARGS_FROMWIRE)73 fromwire_zonemd(ARGS_FROMWIRE) {
74 isc_region_t sr;
75
76 REQUIRE(type == dns_rdatatype_zonemd);
77
78 UNUSED(type);
79 UNUSED(rdclass);
80 UNUSED(dctx);
81 UNUSED(options);
82
83 isc_buffer_activeregion(source, &sr);
84 /*
85 * serial: 4
86 * scheme: 1
87 * hash algorithm: 1
88 * digest: at least 1
89 */
90 if (sr.length < 7)
91 return (ISC_R_UNEXPECTEDEND);
92
93 if (sr.base[5] == DNS_ZONEMD_DIGEST_SHA384) {
94 if (sr.length < 6 + ISC_SHA384_DIGESTLENGTH)
95 return (ISC_R_UNEXPECTEDEND);
96 else
97 /* truncate in case there is additional junk */
98 sr.length = 6 + ISC_SHA384_DIGESTLENGTH;
99 }
100
101 isc_buffer_forward(source, sr.length);
102 return (isc_mem_tobuffer(target, sr.base, sr.length));
103 }
104
105 static inline isc_result_t
towire_zonemd(ARGS_TOWIRE)106 towire_zonemd(ARGS_TOWIRE) {
107 isc_region_t sr;
108
109 REQUIRE(rdata->type == dns_rdatatype_zonemd);
110 REQUIRE(rdata->length != 0);
111
112 UNUSED(cctx);
113
114 dns_rdata_toregion(rdata, &sr);
115 return (isc_mem_tobuffer(target, sr.base, sr.length));
116 }
117
118 #endif /* RDATA_GENERIC_ZONEMD_63_C */
119