/*** This file is part of systemd. Copyright 2014 Tom Gundersen 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 . ***/ #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; }