1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2014 Lennart Poettering
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.
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.
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/>.
22 #include "siphash24.h"
24 #include "resolved-dns-server.h"
32 const union in_addr_union *in_addr) {
37 assert((type == DNS_SERVER_LINK) == !!l);
40 s = new0(DnsServer, 1);
46 s->address = *in_addr;
48 if (type == DNS_SERVER_LINK) {
49 LIST_FIND_TAIL(servers, l->dns_servers, tail);
50 LIST_INSERT_AFTER(servers, l->dns_servers, tail, s);
52 } else if (type == DNS_SERVER_SYSTEM) {
53 LIST_FIND_TAIL(servers, m->dns_servers, tail);
54 LIST_INSERT_AFTER(servers, m->dns_servers, tail, s);
55 } else if (type == DNS_SERVER_FALLBACK) {
56 LIST_FIND_TAIL(servers, m->fallback_dns_servers, tail);
57 LIST_INSERT_AFTER(servers, m->fallback_dns_servers, tail, s);
59 assert_not_reached("Unknown server type");
63 /* A new DNS server that isn't fallback is added and the one
64 * we used so far was a fallback one? Then let's try to pick
66 if (type != DNS_SERVER_FALLBACK &&
67 m->current_dns_server &&
68 m->current_dns_server->type == DNS_SERVER_FALLBACK)
69 manager_set_dns_server(m, NULL);
77 DnsServer* dns_server_free(DnsServer *s) {
82 if (s->type == DNS_SERVER_LINK)
83 LIST_REMOVE(servers, s->link->dns_servers, s);
84 else if (s->type == DNS_SERVER_SYSTEM)
85 LIST_REMOVE(servers, s->manager->dns_servers, s);
86 else if (s->type == DNS_SERVER_FALLBACK)
87 LIST_REMOVE(servers, s->manager->fallback_dns_servers, s);
89 assert_not_reached("Unknown server type");
91 if (s->manager->current_dns_server == s)
92 manager_set_dns_server(s->manager, NULL);
95 if (s->link && s->link->current_dns_server == s)
96 link_set_dns_server(s->link, NULL);
103 unsigned long dns_server_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) {
104 const DnsServer *s = p;
107 siphash24((uint8_t*) &u, &s->address, FAMILY_ADDRESS_SIZE(s->family), hash_key);
108 u = u * hash_key[0] + u + s->family;
113 int dns_server_compare_func(const void *a, const void *b) {
114 const DnsServer *x = a, *y = b;
116 if (x->family < y->family)
118 if (x->family > y->family)
121 return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));