/* SPDX-License-Identifier: LGPL-2.1+ */ #include "alloc-util.h" #include "conf-parser.h" #include "def.h" #include "extract-word.h" #include "hexdecoct.h" #include "parse-util.h" #include "resolved-conf.h" #include "resolved-dnssd.h" #include "specifier.h" #include "string-table.h" #include "string-util.h" #include "utf8.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 config_parse_dnssd_service_name(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) { static const Specifier specifier_table[] = { { 'b', specifier_boot_id, NULL }, { 'H', specifier_host_name, NULL }, { 'm', specifier_machine_id, NULL }, { 'v', specifier_kernel_release, NULL }, {} }; DnssdService *s = userdata; _cleanup_free_ char *name = NULL; int r; assert(filename); assert(lvalue); assert(rvalue); assert(s); if (isempty(rvalue)) { log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name can't be empty. Ignoring."); return -EINVAL; } r = free_and_strdup(&s->name_template, rvalue); if (r < 0) return log_oom(); r = specifier_printf(s->name_template, specifier_table, NULL, &name); if (r < 0) return log_debug_errno(r, "Failed to replace specifiers: %m"); if (!dns_service_name_is_valid(name)) { log_syntax(unit, LOG_ERR, filename, line, 0, "Service instance name template renders to invalid name '%s'. Ignoring.", name); return -EINVAL; } return 0; } int config_parse_dnssd_service_type(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) { DnssdService *s = userdata; int r; assert(filename); assert(lvalue); assert(rvalue); assert(s); if (isempty(rvalue)) { log_syntax(unit, LOG_ERR, filename, line, 0, "Service type can't be empty. Ignoring."); return -EINVAL; } if (!dnssd_srv_type_is_valid(rvalue)) { log_syntax(unit, LOG_ERR, filename, line, 0, "Service type is invalid. Ignoring."); return -EINVAL; } r = free_and_strdup(&s->type, rvalue); if (r < 0) return log_oom(); return 0; } int config_parse_dnssd_txt(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) { _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; DnssdService *s = userdata; DnsTxtItem *last = NULL; assert(filename); assert(lvalue); assert(rvalue); assert(s); if (isempty(rvalue)) { /* Flush out collected items */ s->txt_data_items = dnssd_txtdata_free_all(s->txt_data_items); return 0; } txt_data = new0(DnssdTxtData, 1); if (!txt_data) return log_oom(); for (;;) { _cleanup_free_ char *word = NULL; _cleanup_free_ char *key = NULL; _cleanup_free_ char *value = NULL; _cleanup_free_ void *decoded = NULL; size_t length = 0; DnsTxtItem *i; int r; r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE|EXTRACT_CUNESCAPE_RELAX); if (r == 0) break; if (r == -ENOMEM) return log_oom(); if (r < 0) return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue); r = split_pair(word, "=", &key, &value); if (r == -ENOMEM) return log_oom(); if (r == -EINVAL) key = TAKE_PTR(word); if (!ascii_is_valid(key)) { log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid syntax, ignoring: %s", key); return -EINVAL; } switch (ltype) { case DNS_TXT_ITEM_DATA: if (value) { r = unbase64mem(value, strlen(value), &decoded, &length); if (r == -ENOMEM) return log_oom(); if (r < 0) return log_syntax(unit, LOG_ERR, filename, line, r, "Invalid base64 encoding, ignoring: %s", value); } r = dnssd_txt_item_new_from_data(key, decoded, length, &i); if (r < 0) return log_oom(); break; case DNS_TXT_ITEM_TEXT: r = dnssd_txt_item_new_from_string(key, value, &i); if (r < 0) return log_oom(); break; default: assert_not_reached("Unknown type of Txt config"); } LIST_INSERT_AFTER(items, txt_data->txt, last, i); last = i; } if (!LIST_IS_EMPTY(txt_data->txt)) { LIST_PREPEND(items, s->txt_data_items, txt_data); txt_data = NULL; } 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, CONFIG_PARSE_WARN, 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; } #if ! HAVE_GCRYPT if (m->dnssec_mode != DNSSEC_NO) { log_warning("DNSSEC option cannot be enabled or set to allow-downgrade when systemd-resolved is built without gcrypt support. Turning off DNSSEC support."); m->dnssec_mode = DNSSEC_NO; } #endif #if ! ENABLE_DNS_OVER_TLS if (m->dns_over_tls_mode != DNS_OVER_TLS_NO) { log_warning("DNS-over-TLS option cannot be set to opportunistic when systemd-resolved is built without DNS-over-TLS support. Turning off DNS-over-TLS support."); m->dns_over_tls_mode = DNS_OVER_TLS_NO; } #endif return 0; }