2014-07-16 00:26:02 +02:00
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/*-*- 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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2014-07-16 20:15:47 +02:00
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#include <netinet/tcp.h>
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2014-07-16 00:26:02 +02:00
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#include "strv.h"
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2014-07-16 20:15:47 +02:00
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#include "socket-util.h"
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2014-07-16 00:26:02 +02:00
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#include "resolved-dns-domain.h"
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#include "resolved-dns-scope.h"
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#define SEND_TIMEOUT_USEC (2*USEC_PER_SEC)
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int dns_scope_new(Manager *m, DnsScope **ret, DnsScopeType t) {
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DnsScope *s;
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assert(m);
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assert(ret);
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s = new0(DnsScope, 1);
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if (!s)
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return -ENOMEM;
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s->manager = m;
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s->type = t;
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LIST_PREPEND(scopes, m->dns_scopes, s);
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*ret = s;
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return 0;
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}
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DnsScope* dns_scope_free(DnsScope *s) {
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if (!s)
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return NULL;
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while (s->transactions) {
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DnsQuery *q;
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q = s->transactions->query;
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dns_query_transaction_free(s->transactions);
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dns_query_finish(q);
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}
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2014-07-17 19:38:37 +02:00
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dns_cache_flush(&s->cache);
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2014-07-16 00:26:02 +02:00
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LIST_REMOVE(scopes, s->manager->dns_scopes, s);
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strv_free(s->domains);
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free(s);
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return NULL;
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}
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DnsServer *dns_scope_get_server(DnsScope *s) {
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assert(s);
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if (s->link)
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return link_get_dns_server(s->link);
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else
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return manager_get_dns_server(s->manager);
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}
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void dns_scope_next_dns_server(DnsScope *s) {
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assert(s);
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if (s->link)
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link_next_dns_server(s->link);
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else
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manager_next_dns_server(s->manager);
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}
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int dns_scope_send(DnsScope *s, DnsPacket *p) {
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int ifindex = 0;
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DnsServer *srv;
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int r;
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assert(s);
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assert(p);
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srv = dns_scope_get_server(s);
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if (!srv)
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2014-07-16 20:15:47 +02:00
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return -ESRCH;
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if (s->link) {
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if (p->size > s->link->mtu)
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return -EMSGSIZE;
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2014-07-16 00:26:02 +02:00
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ifindex = s->link->ifindex;
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2014-07-17 01:13:22 +02:00
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} else {
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uint32_t mtu;
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mtu = manager_find_mtu(s->manager);
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if (mtu > 0) {
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if (p->size > mtu)
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return -EMSGSIZE;
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}
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2014-07-16 20:15:47 +02:00
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}
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2014-07-16 00:26:02 +02:00
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2014-07-17 01:13:22 +02:00
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if (p->size > DNS_PACKET_UNICAST_SIZE_MAX)
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return -EMSGSIZE;
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2014-07-16 00:26:02 +02:00
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if (srv->family == AF_INET)
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r = manager_dns_ipv4_send(s->manager, srv, ifindex, p);
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else if (srv->family == AF_INET6)
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r = manager_dns_ipv6_send(s->manager, srv, ifindex, p);
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else
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return -EAFNOSUPPORT;
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if (r < 0)
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return r;
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return 1;
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}
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2014-07-16 20:15:47 +02:00
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int dns_scope_tcp_socket(DnsScope *s) {
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_cleanup_close_ int fd = -1;
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union sockaddr_union sa = {};
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socklen_t salen;
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int one, ifindex, ret;
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DnsServer *srv;
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int r;
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assert(s);
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srv = dns_scope_get_server(s);
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if (!srv)
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return -ESRCH;
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if (s->link)
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ifindex = s->link->ifindex;
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sa.sa.sa_family = srv->family;
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if (srv->family == AF_INET) {
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sa.in.sin_port = htobe16(53);
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sa.in.sin_addr = srv->address.in;
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salen = sizeof(sa.in);
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} else if (srv->family == AF_INET6) {
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sa.in6.sin6_port = htobe16(53);
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sa.in6.sin6_addr = srv->address.in6;
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sa.in6.sin6_scope_id = ifindex;
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salen = sizeof(sa.in6);
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} else
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return -EAFNOSUPPORT;
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fd = socket(srv->family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (fd < 0)
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return -errno;
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one = 1;
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setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
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r = connect(fd, &sa.sa, salen);
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if (r < 0 && errno != EINPROGRESS)
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return -errno;
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ret = fd;
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fd = -1;
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return ret;
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}
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2014-07-16 00:26:02 +02:00
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DnsScopeMatch dns_scope_test(DnsScope *s, const char *domain) {
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char **i;
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assert(s);
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assert(domain);
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STRV_FOREACH(i, s->domains)
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if (dns_name_endswith(domain, *i))
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return DNS_SCOPE_YES;
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if (dns_name_root(domain))
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return DNS_SCOPE_NO;
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2014-07-17 01:14:07 +02:00
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if (is_localhost(domain))
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return DNS_SCOPE_NO;
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2014-07-16 00:26:02 +02:00
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if (s->type == DNS_SCOPE_MDNS) {
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if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
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dns_name_endswith(domain, "0.8.e.f.ip6.arpa"))
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return DNS_SCOPE_YES;
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2014-07-17 01:14:19 +02:00
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else if (dns_name_endswith(domain, "local") &&
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2014-07-16 00:26:02 +02:00
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!dns_name_single_label(domain))
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return DNS_SCOPE_MAYBE;
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return DNS_SCOPE_NO;
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}
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if (s->type == DNS_SCOPE_DNS) {
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if (dns_name_endswith(domain, "254.169.in-addr.arpa") ||
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dns_name_endswith(domain, "0.8.e.f.ip6.arpa") ||
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dns_name_single_label(domain))
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return DNS_SCOPE_NO;
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return DNS_SCOPE_MAYBE;
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}
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assert_not_reached("Unknown scope type");
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}
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