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faa133f3 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "resolved-dns-answer.h" | |
7e8e0422 | 23 | #include "resolved-dns-domain.h" |
faa133f3 LP |
24 | |
25 | DnsAnswer *dns_answer_new(unsigned n) { | |
26 | DnsAnswer *a; | |
27 | ||
28 | assert(n > 0); | |
29 | ||
30 | a = malloc0(offsetof(DnsAnswer, rrs) + sizeof(DnsResourceRecord*) * n); | |
31 | if (!a) | |
32 | return NULL; | |
33 | ||
34 | a->n_ref = 1; | |
35 | a->n_allocated = n; | |
36 | ||
37 | return a; | |
38 | } | |
39 | ||
40 | DnsAnswer *dns_answer_ref(DnsAnswer *a) { | |
41 | if (!a) | |
42 | return NULL; | |
43 | ||
44 | assert(a->n_ref > 0); | |
45 | a->n_ref++; | |
46 | return a; | |
47 | } | |
48 | ||
49 | DnsAnswer *dns_answer_unref(DnsAnswer *a) { | |
50 | if (!a) | |
51 | return NULL; | |
52 | ||
53 | assert(a->n_ref > 0); | |
54 | ||
55 | if (a->n_ref == 1) { | |
56 | unsigned i; | |
57 | ||
58 | for (i = 0; i < a->n_rrs; i++) | |
59 | dns_resource_record_unref(a->rrs[i]); | |
60 | ||
61 | free(a); | |
62 | } else | |
63 | a->n_ref--; | |
64 | ||
65 | return NULL; | |
66 | } | |
67 | ||
68 | int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr) { | |
7e8e0422 LP |
69 | unsigned i; |
70 | int r; | |
71 | ||
faa133f3 LP |
72 | assert(a); |
73 | assert(rr); | |
74 | ||
7e8e0422 LP |
75 | for (i = 0; i < a->n_rrs; i++) { |
76 | r = dns_resource_record_equal(a->rrs[i], rr); | |
77 | if (r < 0) | |
78 | return r; | |
79 | if (r > 0) { | |
80 | /* Entry already exists, keep the entry with | |
81 | * the higher RR, or the one with TTL 0 */ | |
82 | ||
83 | if (rr->ttl == 0 || (rr->ttl > a->rrs[i]->ttl && a->rrs[i]->ttl != 0)) { | |
84 | dns_resource_record_ref(rr); | |
85 | dns_resource_record_unref(a->rrs[i]); | |
86 | a->rrs[i] = rr; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | } | |
92 | ||
faa133f3 LP |
93 | if (a->n_rrs >= a->n_allocated) |
94 | return -ENOSPC; | |
95 | ||
96 | a->rrs[a->n_rrs++] = dns_resource_record_ref(rr); | |
7e8e0422 LP |
97 | return 1; |
98 | } | |
99 | ||
100 | int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) { | |
101 | unsigned i; | |
102 | int r; | |
103 | ||
104 | assert(a); | |
105 | assert(key); | |
106 | ||
107 | for (i = 0; i < a->n_rrs; i++) { | |
108 | r = dns_resource_key_match_rr(key, a->rrs[i]); | |
109 | if (r < 0) | |
110 | return r; | |
111 | if (r > 0) | |
112 | return 1; | |
113 | } | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret) { | |
119 | unsigned i; | |
120 | ||
121 | assert(a); | |
122 | assert(key); | |
123 | assert(ret); | |
124 | ||
125 | for (i = 0; i < a->n_rrs; i++) { | |
126 | ||
127 | if (a->rrs[i]->key->class != DNS_CLASS_IN) | |
128 | continue; | |
129 | ||
130 | if (a->rrs[i]->key->type != DNS_TYPE_SOA) | |
131 | continue; | |
132 | ||
133 | if (dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(a->rrs[i]->key))) { | |
134 | *ret = a->rrs[i]; | |
135 | return 1; | |
136 | } | |
137 | } | |
138 | ||
faa133f3 LP |
139 | return 0; |
140 | } |