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a51c1048 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2015 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include "alloc-util.h" | |
21 | #include "dns-domain.h" | |
22 | #include "resolved-dns-search-domain.h" | |
23 | ||
24 | int dns_search_domain_new( | |
25 | Manager *m, | |
26 | DnsSearchDomain **ret, | |
27 | DnsSearchDomainType type, | |
28 | Link *l, | |
29 | const char *name) { | |
30 | ||
31 | _cleanup_free_ char *normalized = NULL; | |
eed857b7 | 32 | DnsSearchDomain *d; |
a51c1048 LP |
33 | int r; |
34 | ||
35 | assert(m); | |
36 | assert((type == DNS_SEARCH_DOMAIN_LINK) == !!l); | |
37 | assert(name); | |
38 | ||
39 | r = dns_name_normalize(name, &normalized); | |
40 | if (r < 0) | |
41 | return r; | |
42 | ||
eed857b7 LP |
43 | if (l) { |
44 | if (l->n_search_domains >= LINK_SEARCH_DOMAINS_MAX) | |
45 | return -E2BIG; | |
46 | } else { | |
47 | if (m->n_search_domains >= MANAGER_SEARCH_DOMAINS_MAX) | |
48 | return -E2BIG; | |
49 | } | |
50 | ||
a51c1048 LP |
51 | d = new0(DnsSearchDomain, 1); |
52 | if (!d) | |
53 | return -ENOMEM; | |
54 | ||
55 | d->n_ref = 1; | |
56 | d->manager = m; | |
57 | d->type = type; | |
58 | d->name = normalized; | |
59 | normalized = NULL; | |
60 | ||
61 | switch (type) { | |
62 | ||
63 | case DNS_SEARCH_DOMAIN_LINK: | |
64 | d->link = l; | |
eed857b7 LP |
65 | LIST_APPEND(domains, l->search_domains, d); |
66 | l->n_search_domains++; | |
a51c1048 LP |
67 | break; |
68 | ||
69 | case DNS_SERVER_SYSTEM: | |
eed857b7 LP |
70 | LIST_APPEND(domains, m->search_domains, d); |
71 | m->n_search_domains++; | |
a51c1048 LP |
72 | break; |
73 | ||
74 | default: | |
75 | assert_not_reached("Unknown search domain type"); | |
76 | } | |
77 | ||
78 | d->linked = true; | |
79 | ||
80 | if (ret) | |
81 | *ret = d; | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | DnsSearchDomain* dns_search_domain_ref(DnsSearchDomain *d) { | |
87 | if (!d) | |
88 | return NULL; | |
89 | ||
90 | assert(d->n_ref > 0); | |
91 | d->n_ref++; | |
92 | ||
93 | return d; | |
94 | } | |
95 | ||
96 | DnsSearchDomain* dns_search_domain_unref(DnsSearchDomain *d) { | |
97 | if (!d) | |
98 | return NULL; | |
99 | ||
100 | assert(d->n_ref > 0); | |
101 | d->n_ref--; | |
102 | ||
103 | if (d->n_ref > 0) | |
104 | return NULL; | |
105 | ||
106 | free(d->name); | |
6b430fdb | 107 | return mfree(d); |
a51c1048 LP |
108 | } |
109 | ||
110 | void dns_search_domain_unlink(DnsSearchDomain *d) { | |
111 | assert(d); | |
112 | assert(d->manager); | |
113 | ||
114 | if (!d->linked) | |
115 | return; | |
116 | ||
117 | switch (d->type) { | |
118 | ||
119 | case DNS_SEARCH_DOMAIN_LINK: | |
120 | assert(d->link); | |
eed857b7 | 121 | assert(d->link->n_search_domains > 0); |
a51c1048 | 122 | LIST_REMOVE(domains, d->link->search_domains, d); |
eed857b7 | 123 | d->link->n_search_domains--; |
a51c1048 LP |
124 | break; |
125 | ||
126 | case DNS_SEARCH_DOMAIN_SYSTEM: | |
eed857b7 | 127 | assert(d->manager->n_search_domains > 0); |
a51c1048 | 128 | LIST_REMOVE(domains, d->manager->search_domains, d); |
eed857b7 | 129 | d->manager->n_search_domains--; |
a51c1048 LP |
130 | break; |
131 | } | |
132 | ||
133 | d->linked = false; | |
134 | ||
135 | dns_search_domain_unref(d); | |
136 | } | |
137 | ||
138 | void dns_search_domain_move_back_and_unmark(DnsSearchDomain *d) { | |
139 | DnsSearchDomain *tail; | |
140 | ||
141 | assert(d); | |
142 | ||
143 | if (!d->marked) | |
144 | return; | |
145 | ||
146 | d->marked = false; | |
147 | ||
148 | if (!d->linked || !d->domains_next) | |
149 | return; | |
150 | ||
151 | switch (d->type) { | |
152 | ||
153 | case DNS_SEARCH_DOMAIN_LINK: | |
154 | assert(d->link); | |
155 | LIST_FIND_TAIL(domains, d, tail); | |
156 | LIST_REMOVE(domains, d->link->search_domains, d); | |
157 | LIST_INSERT_AFTER(domains, d->link->search_domains, tail, d); | |
158 | break; | |
159 | ||
160 | case DNS_SEARCH_DOMAIN_SYSTEM: | |
161 | LIST_FIND_TAIL(domains, d, tail); | |
162 | LIST_REMOVE(domains, d->manager->search_domains, d); | |
163 | LIST_INSERT_AFTER(domains, d->manager->search_domains, tail, d); | |
164 | break; | |
165 | ||
166 | default: | |
167 | assert_not_reached("Unknown search domain type"); | |
168 | } | |
169 | } | |
170 | ||
171 | void dns_search_domain_unlink_all(DnsSearchDomain *first) { | |
172 | DnsSearchDomain *next; | |
173 | ||
174 | if (!first) | |
175 | return; | |
176 | ||
177 | next = first->domains_next; | |
178 | dns_search_domain_unlink(first); | |
179 | ||
180 | dns_search_domain_unlink_all(next); | |
181 | } | |
182 | ||
183 | void dns_search_domain_unlink_marked(DnsSearchDomain *first) { | |
184 | DnsSearchDomain *next; | |
185 | ||
186 | if (!first) | |
187 | return; | |
188 | ||
189 | next = first->domains_next; | |
190 | ||
191 | if (first->marked) | |
192 | dns_search_domain_unlink(first); | |
193 | ||
194 | dns_search_domain_unlink_marked(next); | |
195 | } | |
196 | ||
197 | void dns_search_domain_mark_all(DnsSearchDomain *first) { | |
198 | if (!first) | |
199 | return; | |
200 | ||
201 | first->marked = true; | |
202 | dns_search_domain_mark_all(first->domains_next); | |
203 | } | |
204 | ||
205 | int dns_search_domain_find(DnsSearchDomain *first, const char *name, DnsSearchDomain **ret) { | |
206 | DnsSearchDomain *d; | |
207 | int r; | |
208 | ||
209 | assert(name); | |
210 | assert(ret); | |
211 | ||
212 | LIST_FOREACH(domains, d, first) { | |
213 | ||
214 | r = dns_name_equal(name, d->name); | |
215 | if (r < 0) | |
216 | return r; | |
217 | if (r > 0) { | |
218 | *ret = d; | |
219 | return 1; | |
220 | } | |
221 | } | |
222 | ||
223 | *ret = NULL; | |
224 | return 0; | |
225 | } |