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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 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 "alloc-util.h" | |
23 | #include "dns-domain.h" | |
24 | #include "resolved-dns-search-domain.h" | |
25 | ||
26 | int dns_search_domain_new( | |
27 | Manager *m, | |
28 | DnsSearchDomain **ret, | |
29 | DnsSearchDomainType type, | |
30 | Link *l, | |
31 | const char *name) { | |
32 | ||
33 | _cleanup_free_ char *normalized = NULL; | |
eed857b7 | 34 | DnsSearchDomain *d; |
a51c1048 LP |
35 | int r; |
36 | ||
37 | assert(m); | |
38 | assert((type == DNS_SEARCH_DOMAIN_LINK) == !!l); | |
39 | assert(name); | |
40 | ||
41 | r = dns_name_normalize(name, &normalized); | |
42 | if (r < 0) | |
43 | return r; | |
44 | ||
dc477e73 | 45 | if (dns_name_is_root(normalized)) |
a51c1048 LP |
46 | return -EINVAL; |
47 | ||
eed857b7 LP |
48 | if (l) { |
49 | if (l->n_search_domains >= LINK_SEARCH_DOMAINS_MAX) | |
50 | return -E2BIG; | |
51 | } else { | |
52 | if (m->n_search_domains >= MANAGER_SEARCH_DOMAINS_MAX) | |
53 | return -E2BIG; | |
54 | } | |
55 | ||
a51c1048 LP |
56 | d = new0(DnsSearchDomain, 1); |
57 | if (!d) | |
58 | return -ENOMEM; | |
59 | ||
60 | d->n_ref = 1; | |
61 | d->manager = m; | |
62 | d->type = type; | |
63 | d->name = normalized; | |
64 | normalized = NULL; | |
65 | ||
66 | switch (type) { | |
67 | ||
68 | case DNS_SEARCH_DOMAIN_LINK: | |
69 | d->link = l; | |
eed857b7 LP |
70 | LIST_APPEND(domains, l->search_domains, d); |
71 | l->n_search_domains++; | |
a51c1048 LP |
72 | break; |
73 | ||
74 | case DNS_SERVER_SYSTEM: | |
eed857b7 LP |
75 | LIST_APPEND(domains, m->search_domains, d); |
76 | m->n_search_domains++; | |
a51c1048 LP |
77 | break; |
78 | ||
79 | default: | |
80 | assert_not_reached("Unknown search domain type"); | |
81 | } | |
82 | ||
83 | d->linked = true; | |
84 | ||
85 | if (ret) | |
86 | *ret = d; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | DnsSearchDomain* dns_search_domain_ref(DnsSearchDomain *d) { | |
92 | if (!d) | |
93 | return NULL; | |
94 | ||
95 | assert(d->n_ref > 0); | |
96 | d->n_ref++; | |
97 | ||
98 | return d; | |
99 | } | |
100 | ||
101 | DnsSearchDomain* dns_search_domain_unref(DnsSearchDomain *d) { | |
102 | if (!d) | |
103 | return NULL; | |
104 | ||
105 | assert(d->n_ref > 0); | |
106 | d->n_ref--; | |
107 | ||
108 | if (d->n_ref > 0) | |
109 | return NULL; | |
110 | ||
111 | free(d->name); | |
112 | free(d); | |
113 | ||
114 | return NULL; | |
115 | } | |
116 | ||
117 | void dns_search_domain_unlink(DnsSearchDomain *d) { | |
118 | assert(d); | |
119 | assert(d->manager); | |
120 | ||
121 | if (!d->linked) | |
122 | return; | |
123 | ||
124 | switch (d->type) { | |
125 | ||
126 | case DNS_SEARCH_DOMAIN_LINK: | |
127 | assert(d->link); | |
eed857b7 | 128 | assert(d->link->n_search_domains > 0); |
a51c1048 | 129 | LIST_REMOVE(domains, d->link->search_domains, d); |
eed857b7 | 130 | d->link->n_search_domains--; |
a51c1048 LP |
131 | break; |
132 | ||
133 | case DNS_SEARCH_DOMAIN_SYSTEM: | |
eed857b7 | 134 | assert(d->manager->n_search_domains > 0); |
a51c1048 | 135 | LIST_REMOVE(domains, d->manager->search_domains, d); |
eed857b7 | 136 | d->manager->n_search_domains--; |
a51c1048 LP |
137 | break; |
138 | } | |
139 | ||
140 | d->linked = false; | |
141 | ||
142 | dns_search_domain_unref(d); | |
143 | } | |
144 | ||
145 | void dns_search_domain_move_back_and_unmark(DnsSearchDomain *d) { | |
146 | DnsSearchDomain *tail; | |
147 | ||
148 | assert(d); | |
149 | ||
150 | if (!d->marked) | |
151 | return; | |
152 | ||
153 | d->marked = false; | |
154 | ||
155 | if (!d->linked || !d->domains_next) | |
156 | return; | |
157 | ||
158 | switch (d->type) { | |
159 | ||
160 | case DNS_SEARCH_DOMAIN_LINK: | |
161 | assert(d->link); | |
162 | LIST_FIND_TAIL(domains, d, tail); | |
163 | LIST_REMOVE(domains, d->link->search_domains, d); | |
164 | LIST_INSERT_AFTER(domains, d->link->search_domains, tail, d); | |
165 | break; | |
166 | ||
167 | case DNS_SEARCH_DOMAIN_SYSTEM: | |
168 | LIST_FIND_TAIL(domains, d, tail); | |
169 | LIST_REMOVE(domains, d->manager->search_domains, d); | |
170 | LIST_INSERT_AFTER(domains, d->manager->search_domains, tail, d); | |
171 | break; | |
172 | ||
173 | default: | |
174 | assert_not_reached("Unknown search domain type"); | |
175 | } | |
176 | } | |
177 | ||
178 | void dns_search_domain_unlink_all(DnsSearchDomain *first) { | |
179 | DnsSearchDomain *next; | |
180 | ||
181 | if (!first) | |
182 | return; | |
183 | ||
184 | next = first->domains_next; | |
185 | dns_search_domain_unlink(first); | |
186 | ||
187 | dns_search_domain_unlink_all(next); | |
188 | } | |
189 | ||
190 | void dns_search_domain_unlink_marked(DnsSearchDomain *first) { | |
191 | DnsSearchDomain *next; | |
192 | ||
193 | if (!first) | |
194 | return; | |
195 | ||
196 | next = first->domains_next; | |
197 | ||
198 | if (first->marked) | |
199 | dns_search_domain_unlink(first); | |
200 | ||
201 | dns_search_domain_unlink_marked(next); | |
202 | } | |
203 | ||
204 | void dns_search_domain_mark_all(DnsSearchDomain *first) { | |
205 | if (!first) | |
206 | return; | |
207 | ||
208 | first->marked = true; | |
209 | dns_search_domain_mark_all(first->domains_next); | |
210 | } | |
211 | ||
212 | int dns_search_domain_find(DnsSearchDomain *first, const char *name, DnsSearchDomain **ret) { | |
213 | DnsSearchDomain *d; | |
214 | int r; | |
215 | ||
216 | assert(name); | |
217 | assert(ret); | |
218 | ||
219 | LIST_FOREACH(domains, d, first) { | |
220 | ||
221 | r = dns_name_equal(name, d->name); | |
222 | if (r < 0) | |
223 | return r; | |
224 | if (r > 0) { | |
225 | *ret = d; | |
226 | return 1; | |
227 | } | |
228 | } | |
229 | ||
230 | *ret = NULL; | |
231 | return 0; | |
232 | } |