128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "siphash24.h"
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#include "resolved-dns-server.h"
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int dns_server_new(
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Manager *m,
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DnsServer **ret,
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DnsServerType type,
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Link *l,
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int family,
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const union in_addr_union *in_addr) {
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DnsServer *s, *tail;
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assert(m);
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assert((type == DNS_SERVER_LINK) == !!l);
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assert(in_addr);
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s = new0(DnsServer, 1);
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if (!s)
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return -ENOMEM;
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s->type = type;
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s->family = family;
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s->address = *in_addr;
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if (type == DNS_SERVER_LINK) {
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LIST_FIND_TAIL(servers, l->dns_servers, tail);
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LIST_INSERT_AFTER(servers, l->dns_servers, tail, s);
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s->link = l;
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} else if (type == DNS_SERVER_SYSTEM) {
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LIST_FIND_TAIL(servers, m->dns_servers, tail);
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LIST_INSERT_AFTER(servers, m->dns_servers, tail, s);
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} else if (type == DNS_SERVER_FALLBACK) {
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LIST_FIND_TAIL(servers, m->fallback_dns_servers, tail);
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LIST_INSERT_AFTER(servers, m->fallback_dns_servers, tail, s);
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} else
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assert_not_reached("Unknown server type");
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s->manager = m;
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/* A new DNS server that isn't fallback is added and the one
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* we used so far was a fallback one? Then let's try to pick
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* the new one */
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if (type != DNS_SERVER_FALLBACK &&
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m->current_dns_server &&
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m->current_dns_server->type == DNS_SERVER_FALLBACK)
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manager_set_dns_server(m, NULL);
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if (ret)
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*ret = s;
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return 0;
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}
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DnsServer* dns_server_free(DnsServer *s) {
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if (!s)
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return NULL;
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if (s->manager) {
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if (s->type == DNS_SERVER_LINK)
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LIST_REMOVE(servers, s->link->dns_servers, s);
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else if (s->type == DNS_SERVER_SYSTEM)
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LIST_REMOVE(servers, s->manager->dns_servers, s);
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else if (s->type == DNS_SERVER_FALLBACK)
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LIST_REMOVE(servers, s->manager->fallback_dns_servers, s);
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else
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assert_not_reached("Unknown server type");
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if (s->manager->current_dns_server == s)
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manager_set_dns_server(s->manager, NULL);
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}
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if (s->link && s->link->current_dns_server == s)
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link_set_dns_server(s->link, NULL);
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free(s);
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return NULL;
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}
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static unsigned long dns_server_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) {
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const DnsServer *s = p;
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uint64_t u;
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siphash24((uint8_t*) &u, &s->address, FAMILY_ADDRESS_SIZE(s->family), hash_key);
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u = u * hash_key[0] + u + s->family;
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return u;
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}
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static int dns_server_compare_func(const void *a, const void *b) {
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const DnsServer *x = a, *y = b;
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if (x->family < y->family)
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return -1;
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if (x->family > y->family)
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return 1;
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return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));
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}
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const struct hash_ops dns_server_hash_ops = {
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.hash = dns_server_hash_func,
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.compare = dns_server_compare_func
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};
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