74b2466e14
Let's turn resolved into a something truly useful: a fully asynchronous DNS stub resolver that subscribes to network changes. (More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module)
99 lines
2.9 KiB
C
99 lines
2.9 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 "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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DnsServerSource source,
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Link *l,
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unsigned char family,
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union in_addr_union *in_addr) {
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DnsServer *s, *tail;
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assert(m);
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assert(in_addr);
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assert(source < _DNS_SERVER_SOURCE_MAX);
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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->source = source;
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s->family = family;
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s->address = *in_addr;
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if (source == DNS_SERVER_LINK) {
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assert(l);
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LIST_FIND_TAIL(servers, l->link_dns_servers, tail);
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LIST_INSERT_AFTER(servers, l->link_dns_servers, tail, s);
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s->link = l;
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} else if (source == DNS_SERVER_DHCP) {
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assert(l);
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LIST_FIND_TAIL(servers, l->dhcp_dns_servers, tail);
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LIST_INSERT_AFTER(servers, l->dhcp_dns_servers, tail, s);
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s->link = l;
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} else {
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assert(!l);
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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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}
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s->manager = m;
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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->source == DNS_SERVER_LINK) {
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if (s->link)
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LIST_REMOVE(servers, s->link->link_dns_servers, s);
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} else if (s->source == DNS_SERVER_DHCP) {
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if (s->link)
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LIST_REMOVE(servers, s->link->dhcp_dns_servers, s);
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} else if (s->source == DNS_SERVER_SYSTEM) {
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if (s->manager)
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LIST_REMOVE(servers, s->manager->dns_servers, s);
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}
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if (s->link && s->link->current_dns_server == s)
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s->link->current_dns_server = NULL;
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if (s->manager && s->manager->current_dns_server == s)
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s->manager->current_dns_server = NULL;
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free(s);
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return NULL;
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}
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