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/***
This file is part of systemd.
Copyright 2014 Tom Gundersen <teg@jklm.no>
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 "systemd-basic/alloc-util.h"
#include "systemd-basic/def.h"
#include "systemd-basic/extract-word.h"
#include "systemd-basic/parse-util.h"
#include "systemd-basic/string-table.h"
#include "systemd-basic/string-util.h"
#include "systemd-shared/conf-parser.h"
#include "resolved-conf.h"
DEFINE_CONFIG_PARSE_ENUM(config_parse_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode, "Failed to parse DNS stub listener mode setting");
static const char* const dns_stub_listener_mode_table[_DNS_STUB_LISTENER_MODE_MAX] = {
[DNS_STUB_LISTENER_NO] = "no",
[DNS_STUB_LISTENER_UDP] = "udp",
[DNS_STUB_LISTENER_TCP] = "tcp",
[DNS_STUB_LISTENER_YES] = "yes",
};
DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(dns_stub_listener_mode, DnsStubListenerMode, DNS_STUB_LISTENER_YES);
int manager_add_dns_server_by_string(Manager *m, DnsServerType type, const char *word) {
union in_addr_union address;
int family, r, ifindex = 0;
DnsServer *s;
assert(m);
assert(word);
r = in_addr_ifindex_from_string_auto(word, &family, &address, &ifindex);
if (r < 0)
return r;
/* Silently filter out 0.0.0.0 and 127.0.0.53 (our own stub DNS listener) */
if (!dns_server_address_valid(family, &address))
return 0;
/* Filter out duplicates */
s = dns_server_find(manager_get_first_dns_server(m, type), family, &address, ifindex);
if (s) {
/*
* Drop the marker. This is used to find the servers
* that ceased to exist, see
* manager_mark_dns_servers() and
* manager_flush_marked_dns_servers().
*/
dns_server_move_back_and_unmark(s);
return 0;
}
return dns_server_new(m, NULL, type, NULL, family, &address, ifindex);
}
int manager_parse_dns_server_string_and_warn(Manager *m, DnsServerType type, const char *string) {
int r;
assert(m);
assert(string);
for (;;) {
_cleanup_free_ char *word = NULL;
r = extract_first_word(&string, &word, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
r = manager_add_dns_server_by_string(m, type, word);
if (r < 0)
log_warning_errno(r, "Failed to add DNS server address '%s', ignoring: %m", word);
}
return 0;
}
int manager_add_search_domain_by_string(Manager *m, const char *domain) {
DnsSearchDomain *d;
bool route_only;
int r;
assert(m);
assert(domain);
route_only = *domain == '~';
if (route_only)
domain++;
if (dns_name_is_root(domain) || streq(domain, "*")) {
route_only = true;
domain = ".";
}
r = dns_search_domain_find(m->search_domains, domain, &d);
if (r < 0)
return r;
if (r > 0)
dns_search_domain_move_back_and_unmark(d);
else {
r = dns_search_domain_new(m, &d, DNS_SEARCH_DOMAIN_SYSTEM, NULL, domain);
if (r < 0)
return r;
}
d->route_only = route_only;
return 0;
}
int manager_parse_search_domains_and_warn(Manager *m, const char *string) {
int r;
assert(m);
assert(string);
for (;;) {
_cleanup_free_ char *word = NULL;
r = extract_first_word(&string, &word, NULL, EXTRACT_QUOTES);
if (r < 0)
return r;
if (r == 0)
break;
r = manager_add_search_domain_by_string(m, word);
if (r < 0)
log_warning_errno(r, "Failed to add search domain '%s', ignoring: %m", word);
}
return 0;
}
int config_parse_dns_servers(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Manager *m = userdata;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(m);
if (isempty(rvalue))
/* Empty assignment means clear the list */
dns_server_unlink_all(manager_get_first_dns_server(m, ltype));
else {
/* Otherwise, add to the list */
r = manager_parse_dns_server_string_and_warn(m, ltype, rvalue);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse DNS server string '%s'. Ignoring.", rvalue);
return 0;
}
}
/* If we have a manual setting, then we stop reading
* /etc/resolv.conf */
if (ltype == DNS_SERVER_SYSTEM)
m->read_resolv_conf = false;
if (ltype == DNS_SERVER_FALLBACK)
m->need_builtin_fallbacks = false;
return 0;
}
int config_parse_search_domains(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Manager *m = userdata;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(m);
if (isempty(rvalue))
/* Empty assignment means clear the list */
dns_search_domain_unlink_all(m->search_domains);
else {
/* Otherwise, add to the list */
r = manager_parse_search_domains_and_warn(m, rvalue);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse search domains string '%s'. Ignoring.", rvalue);
return 0;
}
}
/* If we have a manual setting, then we stop reading
* /etc/resolv.conf */
m->read_resolv_conf = false;
return 0;
}
int manager_parse_config_file(Manager *m) {
int r;
assert(m);
r = config_parse_many_nulstr(PKGSYSCONFDIR "/resolved.conf",
CONF_PATHS_NULSTR("systemd/resolved.conf.d"),
"Resolve\0",
config_item_perf_lookup, resolved_gperf_lookup,
false, m);
if (r < 0)
return r;
if (m->need_builtin_fallbacks) {
r = manager_parse_dns_server_string_and_warn(m, DNS_SERVER_FALLBACK, DNS_SERVERS);
if (r < 0)
return r;
}
return 0;
}
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