networkd: merge DNS and NTP entries when exporting

[thirdparty/systemd.git] / src / resolve / resolved-dns-server.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2014 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include "resolved-dns-server.h"

int dns_server_new(
                Manager *m,
                DnsServer **ret,
                DnsServerSource source,
                Link *l,
                int family,
                const union in_addr_union *in_addr) {

        DnsServer *s, *tail;

        assert(m);
        assert(in_addr);
        assert(source < _DNS_SERVER_SOURCE_MAX);

        s = new0(DnsServer, 1);
        if (!s)
                return -ENOMEM;

        s->source = source;
        s->family = family;
        s->address = *in_addr;

        if (source == DNS_SERVER_LINK) {
                assert(l);
                LIST_FIND_TAIL(servers, l->link_dns_servers, tail);
                LIST_INSERT_AFTER(servers, l->link_dns_servers, tail, s);
                s->link = l;
        } else if (source == DNS_SERVER_DHCP) {
                assert(l);
                LIST_FIND_TAIL(servers, l->dhcp_dns_servers, tail);
                LIST_INSERT_AFTER(servers, l->dhcp_dns_servers, tail, s);
                s->link = l;
        } else {
                assert(!l);
                LIST_FIND_TAIL(servers, m->dns_servers, tail);
                LIST_INSERT_AFTER(servers, m->dns_servers, tail, s);
        }

        s->manager = m;

        if (ret)
                *ret = s;

        return 0;
}

DnsServer* dns_server_free(DnsServer *s)  {
        if (!s)
                return NULL;

        if (s->source == DNS_SERVER_LINK) {

                if (s->link)
                        LIST_REMOVE(servers, s->link->link_dns_servers, s);
        } else if (s->source == DNS_SERVER_DHCP) {

                if (s->link)
                        LIST_REMOVE(servers, s->link->dhcp_dns_servers, s);

        } else if (s->source == DNS_SERVER_SYSTEM) {

                if (s->manager)
                        LIST_REMOVE(servers, s->manager->dns_servers, s);
        }

        if (s->link && s->link->current_dns_server == s)
                s->link->current_dns_server = NULL;

        if (s->manager && s->manager->current_dns_server == s)
                s->manager->current_dns_server = NULL;

        free(s);

        return NULL;
}