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