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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; | |
34 | DnsSearchDomain *d, *tail; | |
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 | ||
45 | r = dns_name_root(normalized); | |
46 | if (r < 0) | |
47 | return r; | |
48 | if (r > 0) | |
49 | return -EINVAL; | |
50 | ||
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; | |
65 | LIST_FIND_TAIL(domains, l->search_domains, tail); | |
66 | LIST_INSERT_AFTER(domains, l->search_domains, tail, d); | |
67 | break; | |
68 | ||
69 | case DNS_SERVER_SYSTEM: | |
70 | LIST_FIND_TAIL(domains, m->search_domains, tail); | |
71 | LIST_INSERT_AFTER(domains, m->search_domains, tail, d); | |
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); | |
107 | free(d); | |
108 | ||
109 | return NULL; | |
110 | } | |
111 | ||
112 | void dns_search_domain_unlink(DnsSearchDomain *d) { | |
113 | assert(d); | |
114 | assert(d->manager); | |
115 | ||
116 | if (!d->linked) | |
117 | return; | |
118 | ||
119 | switch (d->type) { | |
120 | ||
121 | case DNS_SEARCH_DOMAIN_LINK: | |
122 | assert(d->link); | |
123 | LIST_REMOVE(domains, d->link->search_domains, d); | |
124 | break; | |
125 | ||
126 | case DNS_SEARCH_DOMAIN_SYSTEM: | |
127 | LIST_REMOVE(domains, d->manager->search_domains, d); | |
128 | break; | |
129 | } | |
130 | ||
131 | d->linked = false; | |
132 | ||
133 | dns_search_domain_unref(d); | |
134 | } | |
135 | ||
136 | void dns_search_domain_move_back_and_unmark(DnsSearchDomain *d) { | |
137 | DnsSearchDomain *tail; | |
138 | ||
139 | assert(d); | |
140 | ||
141 | if (!d->marked) | |
142 | return; | |
143 | ||
144 | d->marked = false; | |
145 | ||
146 | if (!d->linked || !d->domains_next) | |
147 | return; | |
148 | ||
149 | switch (d->type) { | |
150 | ||
151 | case DNS_SEARCH_DOMAIN_LINK: | |
152 | assert(d->link); | |
153 | LIST_FIND_TAIL(domains, d, tail); | |
154 | LIST_REMOVE(domains, d->link->search_domains, d); | |
155 | LIST_INSERT_AFTER(domains, d->link->search_domains, tail, d); | |
156 | break; | |
157 | ||
158 | case DNS_SEARCH_DOMAIN_SYSTEM: | |
159 | LIST_FIND_TAIL(domains, d, tail); | |
160 | LIST_REMOVE(domains, d->manager->search_domains, d); | |
161 | LIST_INSERT_AFTER(domains, d->manager->search_domains, tail, d); | |
162 | break; | |
163 | ||
164 | default: | |
165 | assert_not_reached("Unknown search domain type"); | |
166 | } | |
167 | } | |
168 | ||
169 | void dns_search_domain_unlink_all(DnsSearchDomain *first) { | |
170 | DnsSearchDomain *next; | |
171 | ||
172 | if (!first) | |
173 | return; | |
174 | ||
175 | next = first->domains_next; | |
176 | dns_search_domain_unlink(first); | |
177 | ||
178 | dns_search_domain_unlink_all(next); | |
179 | } | |
180 | ||
181 | void dns_search_domain_unlink_marked(DnsSearchDomain *first) { | |
182 | DnsSearchDomain *next; | |
183 | ||
184 | if (!first) | |
185 | return; | |
186 | ||
187 | next = first->domains_next; | |
188 | ||
189 | if (first->marked) | |
190 | dns_search_domain_unlink(first); | |
191 | ||
192 | dns_search_domain_unlink_marked(next); | |
193 | } | |
194 | ||
195 | void dns_search_domain_mark_all(DnsSearchDomain *first) { | |
196 | if (!first) | |
197 | return; | |
198 | ||
199 | first->marked = true; | |
200 | dns_search_domain_mark_all(first->domains_next); | |
201 | } | |
202 | ||
203 | int dns_search_domain_find(DnsSearchDomain *first, const char *name, DnsSearchDomain **ret) { | |
204 | DnsSearchDomain *d; | |
205 | int r; | |
206 | ||
207 | assert(name); | |
208 | assert(ret); | |
209 | ||
210 | LIST_FOREACH(domains, d, first) { | |
211 | ||
212 | r = dns_name_equal(name, d->name); | |
213 | if (r < 0) | |
214 | return r; | |
215 | if (r > 0) { | |
216 | *ret = d; | |
217 | return 1; | |
218 | } | |
219 | } | |
220 | ||
221 | *ret = NULL; | |
222 | return 0; | |
223 | } |