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: a_1.c,v 1.13 2020/09/14 08:40:43 florian Exp $ */
18
19 /* by Bjorn.Victor@it.uu.se, 2005-05-07 */
20 /* Based on generic/soa_6.c and generic/mx_15.c */
21
22 #ifndef RDATA_CH_3_A_1_C
23 #define RDATA_CH_3_A_1_C
24
25 static inline isc_result_t
totext_ch_a(ARGS_TOTEXT)26 totext_ch_a(ARGS_TOTEXT) {
27 isc_region_t region;
28 dns_name_t name;
29 dns_name_t prefix;
30 int sub;
31 char buf[sizeof("0177777")];
32 uint16_t addr;
33
34 REQUIRE(rdata->type == dns_rdatatype_a);
35 REQUIRE(rdata->rdclass == dns_rdataclass_ch); /* 3 */
36 REQUIRE(rdata->length != 0);
37
38 dns_name_init(&name, NULL);
39 dns_name_init(&prefix, NULL);
40
41 dns_rdata_toregion(rdata, ®ion);
42 dns_name_fromregion(&name, ®ion);
43 isc_region_consume(®ion, name_length(&name));
44 addr = uint16_fromregion(®ion);
45
46 sub = name_prefix(&name, tctx->origin, &prefix);
47 RETERR(dns_name_totext(&prefix, sub, target));
48
49 snprintf(buf, sizeof(buf), "%o", addr); /* note octal */
50 RETERR(isc_str_tobuffer(" ", target));
51 return (isc_str_tobuffer(buf, target));
52 }
53
54 static inline isc_result_t
fromwire_ch_a(ARGS_FROMWIRE)55 fromwire_ch_a(ARGS_FROMWIRE) {
56 isc_region_t sregion;
57 isc_region_t tregion;
58 dns_name_t name;
59
60 REQUIRE(type == dns_rdatatype_a);
61 REQUIRE(rdclass == dns_rdataclass_ch);
62
63 UNUSED(type);
64 UNUSED(rdclass);
65
66 dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
67
68 dns_name_init(&name, NULL);
69
70 RETERR(dns_name_fromwire(&name, source, dctx, options, target));
71
72 isc_buffer_activeregion(source, &sregion);
73 isc_buffer_availableregion(target, &tregion);
74 if (sregion.length < 2)
75 return (ISC_R_UNEXPECTEDEND);
76 if (tregion.length < 2)
77 return (ISC_R_NOSPACE);
78
79 memmove(tregion.base, sregion.base, 2);
80 isc_buffer_forward(source, 2);
81 isc_buffer_add(target, 2);
82
83 return (ISC_R_SUCCESS);
84 }
85
86 static inline isc_result_t
towire_ch_a(ARGS_TOWIRE)87 towire_ch_a(ARGS_TOWIRE) {
88 dns_name_t name;
89 dns_offsets_t offsets;
90 isc_region_t sregion;
91 isc_region_t tregion;
92
93 REQUIRE(rdata->type == dns_rdatatype_a);
94 REQUIRE(rdata->rdclass == dns_rdataclass_ch);
95 REQUIRE(rdata->length != 0);
96
97 dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
98
99 dns_name_init(&name, offsets);
100
101 dns_rdata_toregion(rdata, &sregion);
102
103 dns_name_fromregion(&name, &sregion);
104 isc_region_consume(&sregion, name_length(&name));
105 RETERR(dns_name_towire(&name, cctx, target));
106
107 isc_buffer_availableregion(target, &tregion);
108 if (tregion.length < 2)
109 return (ISC_R_NOSPACE);
110
111 memmove(tregion.base, sregion.base, 2);
112 isc_buffer_add(target, 2);
113 return (ISC_R_SUCCESS);
114 }
115
116 #endif /* RDATA_CH_3_A_1_C */
117