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