/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include "sd-bus.h" #include "alloc-util.h" #include "bus-common-errors.h" #include "bus-get-properties.h" #include "bus-locator.h" #include "bus-log-control-api.h" #include "bus-message-util.h" #include "bus-object.h" #include "bus-polkit.h" #include "bus-util.h" #include "dns-answer.h" #include "dns-domain.h" #include "dns-packet.h" #include "dns-question.h" #include "dns-rr.h" #include "format-util.h" #include "path-util.h" #include "resolve-util.h" #include "resolved-bus.h" #include "resolved-def.h" #include "resolved-dns-delegate-bus.h" #include "resolved-dns-delegate.h" #include "resolved-dns-dnssec.h" #include "resolved-dns-query.h" #include "resolved-dns-scope.h" #include "resolved-dns-search-domain.h" #include "resolved-dns-server.h" #include "resolved-dns-stream.h" #include "resolved-dns-stub.h" #include "resolved-dns-synthesize.h" #include "resolved-dns-transaction.h" #include "resolved-dnssd-bus.h" #include "resolved-dnssd.h" #include "resolved-link-bus.h" #include "resolved-link.h" #include "resolved-manager.h" #include "resolved-resolv-conf.h" #include "set.h" #include "socket-netlink.h" #include "string-util.h" #include "utf8.h" BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_resolve_support, resolve_support, ResolveSupport); static int dns_query_new_for_bus( Manager *m, DnsQuery **ret, DnsQuestion *question_utf8, DnsQuestion *question_idna, DnsPacket *question_bypass, int ifindex, uint64_t flags, sd_bus_error *error) { int r; r = dns_query_new(m, ret, question_utf8, question_idna, question_bypass, ifindex, flags); if (r == -ENOANO) return sd_bus_error_set(error, BUS_ERROR_DNS_REFUSED, "DNS query type refused."); return r; } static int query_on_bus_track(sd_bus_track *t, void *userdata) { DnsQuery *q = ASSERT_PTR(userdata); assert(t); if (!DNS_TRANSACTION_IS_LIVE(q->state)) return 0; log_debug("Client of active query vanished, aborting query."); dns_query_complete(q, DNS_TRANSACTION_ABORTED); return 0; } static int dns_query_bus_track(DnsQuery *q, sd_bus_message *m) { int r; assert(q); assert(m); if (!q->bus_track) { r = sd_bus_track_new(sd_bus_message_get_bus(m), &q->bus_track, query_on_bus_track, q); if (r < 0) return r; } r = sd_bus_track_add_sender(q->bus_track, m); if (r < 0) return r; return 0; } static sd_bus_message *dns_query_steal_request(DnsQuery *q) { assert(q); /* Find the main query, it's the one that owns the message */ while (q->auxiliary_for) q = q->auxiliary_for; /* Let's take the request message out of the DnsQuery object, so that we never send requests twice */ return TAKE_PTR(q->bus_request); } _sd_printf_(3, 4) static int reply_method_errorf( DnsQuery *query, const char *error_name, const char *format, ...) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL; va_list ap; int r; assert(query); assert(format); req = dns_query_steal_request(query); if (!req) /* No bus message set anymore? then we already replied already, let's not answer a second time */ return 0; va_start(ap, format); r = sd_bus_reply_method_errorfv(req, error_name, format, ap); va_end(ap); return r; } _sd_printf_(3, 4) static int reply_method_errnof( DnsQuery *query, int err, const char *format, ...) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL; int r; assert(query); req = dns_query_steal_request(query); if (!req) /* No bus message set anymore? then we already replied already, let's not answer a second time */ return 0; if (format) { va_list ap; va_start(ap, format); r = sd_bus_reply_method_errnofv(req, err, format, ap); va_end(ap); } else r = sd_bus_reply_method_errno(req, err, NULL); return r; } static int reply_query_state(DnsQuery *q) { assert(q); switch (q->state) { case DNS_TRANSACTION_NO_SERVERS: return reply_method_errorf(q, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found"); case DNS_TRANSACTION_TIMEOUT: return reply_method_errorf(q, SD_BUS_ERROR_TIMEOUT, "Query timed out"); case DNS_TRANSACTION_ATTEMPTS_MAX_REACHED: return reply_method_errorf(q, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed"); case DNS_TRANSACTION_INVALID_REPLY: return reply_method_errorf(q, BUS_ERROR_INVALID_REPLY, "Received invalid reply"); case DNS_TRANSACTION_ERRNO: return reply_method_errnof(q, q->answer_errno, "Lookup failed due to system error: %m"); case DNS_TRANSACTION_ABORTED: return reply_method_errorf(q, BUS_ERROR_ABORTED, "Query aborted"); case DNS_TRANSACTION_DNSSEC_FAILED: return reply_method_errorf(q, BUS_ERROR_DNSSEC_FAILED, "DNSSEC validation failed: %s%s%s%s%s%s", dnssec_result_to_string(q->answer_dnssec_result), q->answer_ede_rcode >= 0 ? " (" : "", q->answer_ede_rcode >= 0 ? FORMAT_DNS_EDE_RCODE(q->answer_ede_rcode) : "", (q->answer_ede_rcode >= 0 && !isempty(q->answer_ede_msg)) ? ": " : "", q->answer_ede_rcode >= 0 ? strempty(q->answer_ede_msg) : "", q->answer_ede_rcode >= 0 ? ")" : ""); case DNS_TRANSACTION_NO_TRUST_ANCHOR: return reply_method_errorf(q, BUS_ERROR_NO_TRUST_ANCHOR, "No suitable trust anchor known"); case DNS_TRANSACTION_RR_TYPE_UNSUPPORTED: return reply_method_errorf(q, BUS_ERROR_RR_TYPE_UNSUPPORTED, "Server does not support requested resource record type"); case DNS_TRANSACTION_NETWORK_DOWN: return reply_method_errorf(q, BUS_ERROR_NETWORK_DOWN, "Network is down"); case DNS_TRANSACTION_NOT_FOUND: /* We return this as NXDOMAIN. This is only generated when a host doesn't implement LLMNR/TCP, and we * thus quickly know that we cannot resolve an in-addr.arpa or ip6.arpa address. */ return reply_method_errorf(q, BUS_ERROR_DNS_NXDOMAIN, "'%s' not found", dns_query_string(q)); case DNS_TRANSACTION_NO_SOURCE: return reply_method_errorf(q, BUS_ERROR_NO_SOURCE, "All suitable resolution sources turned off"); case DNS_TRANSACTION_STUB_LOOP: return reply_method_errorf(q, BUS_ERROR_STUB_LOOP, "Configured DNS server loops back to us"); case DNS_TRANSACTION_RCODE_FAILURE: { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL; req = dns_query_steal_request(q); if (!req) /* No bus message set anymore? then we already replied already, let's not answer a second time */ return 0; if (q->answer_rcode == DNS_RCODE_NXDOMAIN) sd_bus_error_setf(&error, BUS_ERROR_DNS_NXDOMAIN, "Name '%s' not found", dns_query_string(q)); else { const char *rc, *n; rc = FORMAT_DNS_RCODE(q->answer_rcode); n = strjoina(_BUS_ERROR_DNS, rc); sd_bus_error_setf(&error, n, "Could not resolve '%s', server or network returned error: %s%s%s%s%s%s", dns_query_string(q), rc, q->answer_ede_rcode >= 0 ? " (" : "", q->answer_ede_rcode >= 0 ? FORMAT_DNS_EDE_RCODE(q->answer_ede_rcode) : "", (q->answer_ede_rcode >= 0 && !isempty(q->answer_ede_msg)) ? ": " : "", q->answer_ede_rcode >= 0 ? strempty(q->answer_ede_msg) : "", q->answer_ede_rcode >= 0 ? ")" : ""); } return sd_bus_reply_method_error(req, &error); } case DNS_TRANSACTION_NULL: case DNS_TRANSACTION_PENDING: case DNS_TRANSACTION_VALIDATING: case DNS_TRANSACTION_SUCCESS: default: assert_not_reached(); } } static int append_address(sd_bus_message *reply, DnsResourceRecord *rr, int ifindex) { int r; assert(reply); assert(rr); r = sd_bus_message_open_container(reply, 'r', "iiay"); if (r < 0) return r; r = sd_bus_message_append(reply, "i", ifindex); if (r < 0) return r; if (rr->key->type == DNS_TYPE_A) { r = sd_bus_message_append(reply, "i", AF_INET); if (r < 0) return r; r = sd_bus_message_append_array(reply, 'y', &rr->a.in_addr, sizeof(struct in_addr)); } else if (rr->key->type == DNS_TYPE_AAAA) { r = sd_bus_message_append(reply, "i", AF_INET6); if (r < 0) return r; r = sd_bus_message_append_array(reply, 'y', &rr->aaaa.in6_addr, sizeof(struct in6_addr)); } else return -EAFNOSUPPORT; if (r < 0) return r; r = sd_bus_message_close_container(reply); if (r < 0) return r; return 0; } static void bus_method_resolve_hostname_complete(DnsQuery *query) { _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL; _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_(dns_query_freep) DnsQuery *q = query; _cleanup_free_ char *normalized = NULL; DnsQuestion *question; DnsResourceRecord *rr; unsigned added = 0; int ifindex, r; assert(q); if (q->state != DNS_TRANSACTION_SUCCESS) { r = reply_query_state(q); goto finish; } r = dns_query_process_cname_many(q); if (r == -ELOOP) { r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q)); goto finish; } if (r < 0) goto finish; if (r == DNS_QUERY_CNAME) { /* This was a cname, and the query was restarted. */ TAKE_PTR(q); return; } r = sd_bus_message_new_method_return(q->bus_request, &reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "(iiay)"); if (r < 0) goto finish; question = dns_query_question_for_protocol(q, q->answer_protocol); DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) { r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain)); if (r < 0) goto finish; if (r == 0) continue; r = append_address(reply, rr, ifindex); if (r < 0) goto finish; if (!canonical) canonical = dns_resource_record_ref(rr); added++; } if (added <= 0) { r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q)); goto finish; } r = sd_bus_message_close_container(reply); if (r < 0) goto finish; /* The key names are not necessarily normalized, make sure that they are when we return them to our * bus clients. */ assert(canonical); r = dns_name_normalize(dns_resource_key_name(canonical->key), 0, &normalized); if (r < 0) goto finish; /* Return the precise spelling and uppercasing and CNAME target reported by the server */ r = sd_bus_message_append( reply, "st", normalized, dns_query_reply_flags_make(q)); if (r < 0) goto finish; q->bus_request = sd_bus_message_unref(q->bus_request); r = sd_bus_send(q->manager->bus, reply, NULL); finish: if (r < 0) { log_error_errno(r, "Failed to send hostname reply: %m"); (void) reply_method_errnof(q, r, NULL); } } static int parse_as_address(sd_bus_message *m, int ifindex, const char *hostname, int family, uint64_t flags) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_free_ char *canonical = NULL; union in_addr_union parsed; int r, ff, parsed_ifindex = 0; /* Check if the hostname is actually already an IP address formatted as string. In that case just parse it, * let's not attempt to look it up. */ r = in_addr_ifindex_from_string_auto(hostname, &ff, &parsed, &parsed_ifindex); if (r < 0) /* not an address */ return 0; if (family != AF_UNSPEC && ff != family) return sd_bus_reply_method_errorf(m, BUS_ERROR_NO_SUCH_RR, "The specified address is not of the requested family."); if (ifindex > 0 && parsed_ifindex > 0 && parsed_ifindex != ifindex) return sd_bus_reply_method_errorf(m, BUS_ERROR_NO_SUCH_RR, "The specified address interface index does not match requested interface."); if (parsed_ifindex > 0) ifindex = parsed_ifindex; r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_open_container(reply, 'a', "(iiay)"); if (r < 0) return r; r = sd_bus_message_open_container(reply, 'r', "iiay"); if (r < 0) return r; r = sd_bus_message_append(reply, "ii", ifindex, ff); if (r < 0) return r; r = sd_bus_message_append_array(reply, 'y', &parsed, FAMILY_ADDRESS_SIZE(ff)); if (r < 0) return r; r = sd_bus_message_close_container(reply); if (r < 0) return r; r = sd_bus_message_close_container(reply); if (r < 0) return r; /* When an IP address is specified we just return it as canonical name, in order to avoid a DNS * look-up. However, we reformat it to make sure it's in a truly canonical form (i.e. on IPv6 the inner * omissions are always done the same way). */ r = in_addr_ifindex_to_string(ff, &parsed, ifindex, &canonical); if (r < 0) return r; r = sd_bus_message_append(reply, "st", canonical, SD_RESOLVED_FLAGS_MAKE(dns_synthesize_protocol(flags), ff, true, true) | SD_RESOLVED_SYNTHETIC); if (r < 0) return r; return sd_bus_send(sd_bus_message_get_bus(m), reply, NULL); } void bus_client_log(sd_bus_message *m, const char *what) { _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; const char *comm = NULL; uid_t uid = UID_INVALID; pid_t pid = 0; int r; assert(m); assert(what); if (!DEBUG_LOGGING) return; r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|SD_BUS_CREDS_COMM|SD_BUS_CREDS_AUGMENT, &creds); if (r < 0) return (void) log_debug_errno(r, "Failed to query client credentials, ignoring: %m"); (void) sd_bus_creds_get_uid(creds, &uid); (void) sd_bus_creds_get_pid(creds, &pid); (void) sd_bus_creds_get_comm(creds, &comm); log_debug("D-Bus %s request from client PID " PID_FMT " (%s) with UID " UID_FMT, what, pid, strna(comm), uid); } static int bus_method_resolve_hostname(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(dns_question_unrefp) DnsQuestion *question_idna = NULL, *question_utf8 = NULL; _cleanup_(dns_query_freep) DnsQuery *q = NULL; Manager *m = ASSERT_PTR(userdata); const char *hostname; int family, ifindex; uint64_t flags; int r; assert(message); assert_cc(sizeof(int) == sizeof(int32_t)); r = sd_bus_message_read(message, "isit", &ifindex, &hostname, &family, &flags); if (r < 0) return r; if (ifindex < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index"); if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family); if (validate_and_mangle_query_flags(m, &flags, hostname, SD_RESOLVED_NO_SEARCH) < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter"); r = parse_as_address(message, ifindex, hostname, family, flags); if (r != 0) return r; r = dns_name_is_valid(hostname); if (r < 0) return r; if (r == 0) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", hostname); r = dns_question_new_address(&question_utf8, family, hostname, false); if (r < 0) return r; r = dns_question_new_address(&question_idna, family, hostname, true); if (r < 0 && r != -EALREADY) return r; bus_client_log(message, "hostname resolution"); r = dns_query_new_for_bus(m, &q, question_utf8, question_idna ?: question_utf8, NULL, ifindex, flags, error); if (r < 0) return r; q->bus_request = sd_bus_message_ref(message); q->request_family = family; q->complete = bus_method_resolve_hostname_complete; r = dns_query_bus_track(q, message); if (r < 0) return r; r = dns_query_go(q); if (r < 0) return r; TAKE_PTR(q); return 1; } static void bus_method_resolve_address_complete(DnsQuery *query) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_(dns_query_freep) DnsQuery *q = query; DnsQuestion *question; DnsResourceRecord *rr; unsigned added = 0; int ifindex, r; assert(q); if (q->state != DNS_TRANSACTION_SUCCESS) { r = reply_query_state(q); goto finish; } r = dns_query_process_cname_many(q); if (r == -ELOOP) { r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q)); goto finish; } if (r < 0) goto finish; if (r == DNS_QUERY_CNAME) { /* This was a cname, and the query was restarted. */ TAKE_PTR(q); return; } r = sd_bus_message_new_method_return(q->bus_request, &reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "(is)"); if (r < 0) goto finish; question = dns_query_question_for_protocol(q, q->answer_protocol); DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) { _cleanup_free_ char *normalized = NULL; r = dns_question_matches_rr(question, rr, NULL); if (r < 0) goto finish; if (r == 0) continue; r = dns_name_normalize(rr->ptr.name, 0, &normalized); if (r < 0) goto finish; r = sd_bus_message_append(reply, "(is)", ifindex, normalized); if (r < 0) goto finish; added++; } if (added <= 0) { r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "Address %s does not have any RR of requested type", IN_ADDR_TO_STRING(q->request_family, &q->request_address)); goto finish; } r = sd_bus_message_close_container(reply); if (r < 0) goto finish; r = sd_bus_message_append(reply, "t", dns_query_reply_flags_make(q)); if (r < 0) goto finish; q->bus_request = sd_bus_message_unref(q->bus_request); r = sd_bus_send(q->manager->bus, reply, NULL); finish: if (r < 0) { log_error_errno(r, "Failed to send address reply: %m"); (void) reply_method_errnof(q, r, NULL); } } static int bus_method_resolve_address(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; _cleanup_(dns_query_freep) DnsQuery *q = NULL; Manager *m = ASSERT_PTR(userdata); union in_addr_union a; int family, ifindex; uint64_t flags; int r; assert(message); assert_cc(sizeof(int) == sizeof(int32_t)); r = sd_bus_message_read(message, "i", &ifindex); if (r < 0) return r; r = bus_message_read_in_addr_auto(message, error, &family, &a); if (r < 0) return r; r = sd_bus_message_read(message, "t", &flags); if (r < 0) return r; if (ifindex < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index"); if (validate_and_mangle_query_flags(m, &flags, /* name= */ NULL, /* ok= */ 0) < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter"); r = dns_question_new_reverse(&question, family, &a); if (r < 0) return r; bus_client_log(message, "address resolution"); r = dns_query_new_for_bus(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH, error); if (r < 0) return r; q->bus_request = sd_bus_message_ref(message); q->request_family = family; q->request_address = a; q->complete = bus_method_resolve_address_complete; r = dns_query_bus_track(q, message); if (r < 0) return r; r = dns_query_go(q); if (r < 0) return r; TAKE_PTR(q); return 1; } static int bus_message_append_rr(sd_bus_message *m, DnsResourceRecord *rr, int ifindex) { int r; assert(m); assert(rr); r = sd_bus_message_open_container(m, 'r', "iqqay"); if (r < 0) return r; r = sd_bus_message_append(m, "iqq", ifindex, rr->key->class, rr->key->type); if (r < 0) return r; r = dns_resource_record_to_wire_format(rr, false); if (r < 0) return r; r = sd_bus_message_append_array(m, 'y', rr->wire_format, rr->wire_format_size); if (r < 0) return r; return sd_bus_message_close_container(m); } static void bus_method_resolve_record_complete(DnsQuery *query) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_(dns_query_freep) DnsQuery *q = query; DnsResourceRecord *rr; DnsQuestion *question; unsigned added = 0; int ifindex; int r; assert(q); if (q->state != DNS_TRANSACTION_SUCCESS) { r = reply_query_state(q); goto finish; } r = dns_query_process_cname_many(q); if (r == -ELOOP) { r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q)); goto finish; } if (r < 0) goto finish; if (r == DNS_QUERY_CNAME) { /* This was a cname, and the query was restarted. */ TAKE_PTR(q); return; } r = sd_bus_message_new_method_return(q->bus_request, &reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "(iqqay)"); if (r < 0) goto finish; question = dns_query_question_for_protocol(q, q->answer_protocol); DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) { r = dns_question_matches_rr(question, rr, NULL); if (r < 0) goto finish; if (r == 0) continue; r = bus_message_append_rr(reply, rr, ifindex); if (r < 0) goto finish; added++; } if (added <= 0) { r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_query_string(q)); goto finish; } r = sd_bus_message_close_container(reply); if (r < 0) goto finish; r = sd_bus_message_append(reply, "t", dns_query_reply_flags_make(q)); if (r < 0) goto finish; q->bus_request = sd_bus_message_unref(q->bus_request); r = sd_bus_send(q->manager->bus, reply, NULL); finish: if (r < 0) { log_error_errno(r, "Failed to send record reply: %m"); (void) reply_method_errnof(q, r, NULL); } } static int bus_method_resolve_record(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL; _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; _cleanup_(dns_query_freep) DnsQuery *q = NULL; Manager *m = ASSERT_PTR(userdata); uint16_t class, type; const char *name; int r, ifindex; uint64_t flags; assert(message); assert_cc(sizeof(int) == sizeof(int32_t)); r = sd_bus_message_read(message, "isqqt", &ifindex, &name, &class, &type, &flags); if (r < 0) return r; if (ifindex < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index"); r = dns_name_is_valid(name); if (r < 0) return r; if (r == 0) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid name '%s'", name); if (!dns_type_is_valid_query(type)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Specified resource record type %" PRIu16 " may not be used in a query.", type); if (dns_type_is_zone_transfer(type)) return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Zone transfers not permitted via this programming interface."); if (dns_type_is_obsolete(type)) return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Specified DNS resource record type %" PRIu16 " is obsolete.", type); if (validate_and_mangle_query_flags(m, &flags, name, SD_RESOLVED_NO_SEARCH) < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter"); question = dns_question_new(1); if (!question) return -ENOMEM; key = dns_resource_key_new(class, type, name); if (!key) return -ENOMEM; r = dns_question_add(question, key, 0); if (r < 0) return r; bus_client_log(message, "resource record resolution"); /* Setting SD_RESOLVED_CLAMP_TTL: let's request that the TTL is fixed up for locally cached entries, * after all we return it in the wire format blob. */ r = dns_query_new_for_bus(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH|SD_RESOLVED_CLAMP_TTL, error); if (r < 0) return r; q->bus_request = sd_bus_message_ref(message); q->complete = bus_method_resolve_record_complete; r = dns_query_bus_track(q, message); if (r < 0) return r; r = dns_query_go(q); if (r < 0) return r; TAKE_PTR(q); return 1; } static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr) { _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL; _cleanup_free_ char *normalized = NULL; int r; assert(q); assert(reply); assert(rr); assert(rr->key); if (rr->key->type != DNS_TYPE_SRV) return 0; if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) { /* First, let's see if we could find an appropriate A or AAAA * record for the SRV record */ LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) { DnsResourceRecord *zz; DnsQuestion *question; if (aux->state != DNS_TRANSACTION_SUCCESS) continue; if (aux->auxiliary_result != 0) continue; question = dns_query_question_for_protocol(aux, aux->answer_protocol); r = dns_name_equal(dns_question_first_name(question), rr->srv.name); if (r < 0) return r; if (r == 0) continue; DNS_ANSWER_FOREACH(zz, aux->answer) { r = dns_question_matches_rr(question, zz, NULL); if (r < 0) return r; if (r == 0) continue; canonical = dns_resource_record_ref(zz); break; } if (canonical) break; } /* Is there are successful A/AAAA lookup for this SRV RR? If not, don't add it */ if (!canonical) return 0; } r = sd_bus_message_open_container(reply, 'r', "qqqsa(iiay)s"); if (r < 0) return r; r = dns_name_normalize(rr->srv.name, 0, &normalized); if (r < 0) return r; r = sd_bus_message_append( reply, "qqqs", rr->srv.priority, rr->srv.weight, rr->srv.port, normalized); if (r < 0) return r; r = sd_bus_message_open_container(reply, 'a', "(iiay)"); if (r < 0) return r; if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) { LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) { DnsResourceRecord *zz; DnsQuestion *question; int ifindex; if (aux->state != DNS_TRANSACTION_SUCCESS) continue; if (aux->auxiliary_result != 0) continue; question = dns_query_question_for_protocol(aux, aux->answer_protocol); r = dns_name_equal(dns_question_first_name(question), rr->srv.name); if (r < 0) return r; if (r == 0) continue; DNS_ANSWER_FOREACH_IFINDEX(zz, ifindex, aux->answer) { r = dns_question_matches_rr(question, zz, NULL); if (r < 0) return r; if (r == 0) continue; r = append_address(reply, zz, ifindex); if (r < 0) return r; } } } r = sd_bus_message_close_container(reply); if (r < 0) return r; if (canonical) { normalized = mfree(normalized); r = dns_name_normalize(dns_resource_key_name(canonical->key), 0, &normalized); if (r < 0) return r; } /* Note that above we appended the hostname as encoded in the * SRV, and here the canonical hostname this maps to. */ r = sd_bus_message_append(reply, "s", normalized); if (r < 0) return r; r = sd_bus_message_close_container(reply); if (r < 0) return r; return 1; } static int append_txt(sd_bus_message *reply, DnsResourceRecord *rr) { int r; assert(reply); assert(rr); assert(rr->key); if (rr->key->type != DNS_TYPE_TXT) return 0; LIST_FOREACH(items, i, rr->txt.items) { if (i->length <= 0) continue; r = sd_bus_message_append_array(reply, 'y', i->data, i->length); if (r < 0) return r; } return 1; } static void resolve_service_all_complete(DnsQuery *query) { _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL; _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_free_ char *name = NULL, *type = NULL, *domain = NULL; _cleanup_(dns_query_freep) DnsQuery *q = query; DnsQuestion *question; DnsResourceRecord *rr; unsigned added = 0; int r; assert(q); if (q->hook_query || q->block_all_complete > 0) { TAKE_PTR(q); return; } if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) { DnsQuery *bad = NULL; bool have_success = false; LIST_FOREACH(auxiliary_queries, aux, q->auxiliary_queries) { if (aux->hook_query) { /* If an auxiliary query's hook is still pending, let's wait */ TAKE_PTR(q); return; } switch (aux->state) { case DNS_TRANSACTION_PENDING: /* If an auxiliary query is still pending, let's wait */ TAKE_PTR(q); return; case DNS_TRANSACTION_SUCCESS: if (aux->auxiliary_result == 0) have_success = true; else bad = aux; break; default: bad = aux; } } if (!have_success) { /* We can only return one error, hence pick the last error we encountered */ assert(bad); if (bad->state == DNS_TRANSACTION_SUCCESS) { assert(bad->auxiliary_result != 0); if (bad->auxiliary_result == -ELOOP) { r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(bad)); goto finish; } assert(bad->auxiliary_result < 0); r = bad->auxiliary_result; goto finish; } r = reply_query_state(bad); goto finish; } } r = sd_bus_message_new_method_return(q->bus_request, &reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "(qqqsa(iiay)s)"); if (r < 0) goto finish; question = dns_query_question_for_protocol(q, q->answer_protocol); DNS_ANSWER_FOREACH(rr, q->answer) { r = dns_question_matches_rr(question, rr, NULL); if (r < 0) goto finish; if (r == 0) continue; r = append_srv(q, reply, rr); if (r < 0) goto finish; if (r == 0) /* not an SRV record */ continue; if (!canonical) canonical = dns_resource_record_ref(rr); added++; } if (added <= 0) { r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q)); goto finish; } r = sd_bus_message_close_container(reply); if (r < 0) goto finish; r = sd_bus_message_open_container(reply, 'a', "ay"); if (r < 0) goto finish; DNS_ANSWER_FOREACH(rr, q->answer) { r = dns_question_matches_rr(question, rr, NULL); if (r < 0) goto finish; if (r == 0) continue; r = append_txt(reply, rr); if (r < 0) goto finish; } r = sd_bus_message_close_container(reply); if (r < 0) goto finish; assert(canonical); r = dns_service_split(dns_resource_key_name(canonical->key), &name, &type, &domain); if (r < 0) goto finish; if (isempty(type)) { r = reply_method_errorf(q, BUS_ERROR_INCONSISTENT_SERVICE_RECORDS, "'%s' does not provide a consistent set of service resource records", dns_query_string(q)); goto finish; } r = sd_bus_message_append( reply, "ssst", name, type, domain, dns_query_reply_flags_make(q)); if (r < 0) goto finish; q->bus_request = sd_bus_message_unref(q->bus_request); r = sd_bus_send(q->manager->bus, reply, NULL); finish: if (r < 0) { log_error_errno(r, "Failed to send service reply: %m"); (void) reply_method_errnof(q, r, NULL); } } static void resolve_service_hostname_complete(DnsQuery *q) { int r; assert(q); assert(q->auxiliary_for); if (q->state != DNS_TRANSACTION_SUCCESS) { resolve_service_all_complete(q->auxiliary_for); return; } r = dns_query_process_cname_many(q); if (r == DNS_QUERY_CNAME) /* This was a cname, and the query was restarted. */ return; /* This auxiliary lookup is finished or failed, let's see if all are finished now. */ q->auxiliary_result = r < 0 ? r : 0; resolve_service_all_complete(q->auxiliary_for); } static int resolve_service_hostname(DnsQuery *q, DnsResourceRecord *rr, int ifindex) { _cleanup_(dns_question_unrefp) DnsQuestion *question = NULL; _cleanup_(dns_query_freep) DnsQuery *aux = NULL; int r; assert(q); assert(rr); assert(rr->key); assert(rr->key->type == DNS_TYPE_SRV); /* OK, we found an SRV record for the service. Let's resolve * the hostname included in it */ r = dns_question_new_address(&question, q->request_family, rr->srv.name, false); if (r < 0) return r; r = dns_query_new(q->manager, &aux, question, question, NULL, ifindex, q->flags|SD_RESOLVED_NO_SEARCH); if (r == -ENOANO) return reply_method_errorf(q, BUS_ERROR_DNS_REFUSED, "DNS query type refused."); if (r < 0) return r; aux->request_family = q->request_family; aux->complete = resolve_service_hostname_complete; r = dns_query_make_auxiliary(aux, q); if (r == -EAGAIN) /* Too many auxiliary lookups? If so, don't complain, * let's just not add this one, we already have more * than enough */ return 0; if (r < 0) return r; /* Note that auxiliary queries do not track the original bus * client, only the primary request does that. */ r = dns_query_go(aux); if (r < 0) return r; TAKE_PTR(aux); return 1; } static void bus_method_resolve_service_complete(DnsQuery *query) { _cleanup_(dns_query_freep) DnsQuery *q = query; bool has_root_domain = false; DnsResourceRecord *rr; DnsQuestion *question; unsigned found = 0; int ifindex, r; assert(q); if (q->state != DNS_TRANSACTION_SUCCESS) { r = reply_query_state(q); goto finish; } r = dns_query_process_cname_many(q); if (r == -ELOOP) { r = reply_method_errorf(q, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_query_string(q)); goto finish; } if (r < 0) goto finish; if (r == DNS_QUERY_CNAME) { /* This was a cname, and the query was restarted. */ TAKE_PTR(q); return; } question = dns_query_question_for_protocol(q, q->answer_protocol); DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) { r = dns_question_matches_rr(question, rr, NULL); if (r < 0) goto finish; if (r == 0) continue; if (rr->key->type != DNS_TYPE_SRV) continue; if (dns_name_is_root(rr->srv.name)) { has_root_domain = true; continue; } if ((q->flags & SD_RESOLVED_NO_ADDRESS) == 0) { q->block_all_complete++; r = resolve_service_hostname(q, rr, ifindex); q->block_all_complete--; if (r < 0) goto finish; } found++; } if (has_root_domain && found <= 0) { /* If there's exactly one SRV RR and it uses the root domain as hostname, then the service is * explicitly not offered on the domain. Report this as a recognizable error. See RFC 2782, * Section "Usage Rules". */ r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_SERVICE, "'%s' does not provide the requested service", dns_query_string(q)); goto finish; } if (found <= 0) { r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_query_string(q)); goto finish; } /* Maybe we are already finished? check now... */ resolve_service_all_complete(TAKE_PTR(q)); return; finish: if (r < 0) { log_error_errno(r, "Failed to send service reply: %m"); (void) reply_method_errnof(q, r, NULL); } } static int bus_method_resolve_service(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(dns_question_unrefp) DnsQuestion *question_idna = NULL, *question_utf8 = NULL; _cleanup_(dns_query_freep) DnsQuery *q = NULL; const char *name, *type, *domain; Manager *m = ASSERT_PTR(userdata); int family, ifindex; uint64_t flags; int r; assert(message); assert_cc(sizeof(int) == sizeof(int32_t)); r = sd_bus_message_read(message, "isssit", &ifindex, &name, &type, &domain, &family, &flags); if (r < 0) return r; if (ifindex < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index"); if (!IN_SET(family, AF_INET, AF_INET6, AF_UNSPEC)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family); if (isempty(name)) name = NULL; else if (!dns_service_name_is_valid(name)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid service name '%s'", name); if (isempty(type)) type = NULL; else if (!dns_srv_type_is_valid(type)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid SRV service type '%s'", type); r = dns_name_is_valid(domain); if (r < 0) return r; if (r == 0) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid domain '%s'", domain); if (name && !type) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Service name cannot be specified without service type."); if (validate_and_mangle_query_flags(m, &flags, name, SD_RESOLVED_NO_TXT|SD_RESOLVED_NO_ADDRESS) < 0) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter"); /* Refuse the method if SRV is filtered. */ if (set_contains(m->refuse_record_types, INT_TO_PTR(DNS_TYPE_SRV))) return sd_bus_error_set(error, BUS_ERROR_DNS_REFUSED, "DNS query type refused."); r = dns_question_new_service(&question_utf8, name, type, domain, !(flags & SD_RESOLVED_NO_TXT), false); if (r < 0) return r; r = dns_question_new_service(&question_idna, name, type, domain, !(flags & SD_RESOLVED_NO_TXT), true); if (r < 0) return r; bus_client_log(message, "service resolution"); r = dns_query_new_for_bus(m, &q, question_utf8, question_idna, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH, error); if (r < 0) return r; q->bus_request = sd_bus_message_ref(message); q->request_family = family; q->complete = bus_method_resolve_service_complete; r = dns_query_bus_track(q, message); if (r < 0) return r; r = dns_query_go(q); if (r < 0) return r; TAKE_PTR(q); return 1; } int bus_dns_server_append( sd_bus_message *reply, DnsServer *s, bool with_ifindex, /* include "ifindex" field */ bool extended) { /* also include port number and server name */ int r; assert(reply); if (!s) { if (with_ifindex) { if (extended) return sd_bus_message_append(reply, "(iiayqs)", 0, AF_UNSPEC, 0, 0, NULL); else return sd_bus_message_append(reply, "(iiay)", 0, AF_UNSPEC, 0); } else { if (extended) return sd_bus_message_append(reply, "(iayqs)", AF_UNSPEC, 0, 0, NULL); else return sd_bus_message_append(reply, "(iay)", AF_UNSPEC, 0); } } r = sd_bus_message_open_container( reply, 'r', with_ifindex ? (extended ? "iiayqs" : "iiay") : (extended ? "iayqs" : "iay")); if (r < 0) return r; if (with_ifindex) { r = sd_bus_message_append(reply, "i", dns_server_ifindex(s)); if (r < 0) return r; } r = sd_bus_message_append(reply, "i", s->family); if (r < 0) return r; r = sd_bus_message_append_array(reply, 'y', &s->address, FAMILY_ADDRESS_SIZE(s->family)); if (r < 0) return r; if (extended) { r = sd_bus_message_append(reply, "q", s->port); if (r < 0) return r; r = sd_bus_message_append(reply, "s", s->server_name); if (r < 0) return r; } return sd_bus_message_close_container(reply); } static int bus_property_get_dns_servers_internal( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error, bool extended) { Manager *m = ASSERT_PTR(userdata); Link *l; int r; assert(reply); r = sd_bus_message_open_container(reply, 'a', extended ? "(iiayqs)" : "(iiay)"); if (r < 0) return r; LIST_FOREACH(servers, s, m->dns_servers) { r = bus_dns_server_append(reply, s, true, extended); if (r < 0) return r; } HASHMAP_FOREACH(l, m->links) LIST_FOREACH(servers, s, l->dns_servers) { r = bus_dns_server_append(reply, s, true, extended); if (r < 0) return r; } return sd_bus_message_close_container(reply); } static int bus_property_get_dns_servers( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { return bus_property_get_dns_servers_internal(bus, path, interface, property, reply, userdata, error, false); } static int bus_property_get_dns_servers_ex( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { return bus_property_get_dns_servers_internal(bus, path, interface, property, reply, userdata, error, true); } static int bus_property_get_fallback_dns_servers_internal( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error, bool extended) { DnsServer **f = ASSERT_PTR(userdata); int r; assert(reply); r = sd_bus_message_open_container(reply, 'a', extended ? "(iiayqs)" : "(iiay)"); if (r < 0) return r; LIST_FOREACH(servers, s, *f) { r = bus_dns_server_append(reply, s, true, extended); if (r < 0) return r; } return sd_bus_message_close_container(reply); } static int bus_property_get_fallback_dns_servers( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { return bus_property_get_fallback_dns_servers_internal(bus, path, interface, property, reply, userdata, error, false); } static int bus_property_get_fallback_dns_servers_ex( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { return bus_property_get_fallback_dns_servers_internal(bus, path, interface, property, reply, userdata, error, true); } static int bus_property_get_current_dns_server_internal( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error, bool extended) { DnsServer *s; assert(reply); assert(userdata); s = *(DnsServer **) userdata; return bus_dns_server_append(reply, s, true, extended); } static int bus_property_get_current_dns_server( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { return bus_property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, false); } static int bus_property_get_current_dns_server_ex( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { return bus_property_get_current_dns_server_internal(bus, path, interface, property, reply, userdata, error, true); } static int bus_property_get_domains( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); Link *l; int r; assert(reply); r = sd_bus_message_open_container(reply, 'a', "(isb)"); if (r < 0) return r; LIST_FOREACH(domains, d, m->search_domains) { r = sd_bus_message_append(reply, "(isb)", 0, d->name, d->route_only); if (r < 0) return r; } HASHMAP_FOREACH(l, m->links) { LIST_FOREACH(domains, d, l->search_domains) { r = sd_bus_message_append(reply, "(isb)", l->ifindex, d->name, d->route_only); if (r < 0) return r; } } return sd_bus_message_close_container(reply); } static int bus_property_get_transaction_statistics( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); assert(reply); return sd_bus_message_append(reply, "(tt)", (uint64_t) hashmap_size(m->dns_transactions), (uint64_t) m->n_transactions_total); } static int bus_property_get_cache_statistics( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { uint64_t size = 0, hit = 0, miss = 0; Manager *m = ASSERT_PTR(userdata); assert(reply); LIST_FOREACH(scopes, s, m->dns_scopes) { size += dns_cache_size(&s->cache); hit += s->cache.n_hit; miss += s->cache.n_miss; } return sd_bus_message_append(reply, "(ttt)", size, hit, miss); } static int bus_property_get_dnssec_statistics( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); assert(reply); return sd_bus_message_append(reply, "(tttt)", (uint64_t) m->n_dnssec_verdict[DNSSEC_SECURE], (uint64_t) m->n_dnssec_verdict[DNSSEC_INSECURE], (uint64_t) m->n_dnssec_verdict[DNSSEC_BOGUS], (uint64_t) m->n_dnssec_verdict[DNSSEC_INDETERMINATE]); } static BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_dns_stub_listener_mode, dns_stub_listener_mode, DnsStubListenerMode); static BUS_DEFINE_PROPERTY_GET(bus_property_get_dnssec_supported, "b", Manager, manager_dnssec_supported); static BUS_DEFINE_PROPERTY_GET2(bus_property_get_dnssec_mode, "s", Manager, manager_get_dnssec_mode, dnssec_mode_to_string); static BUS_DEFINE_PROPERTY_GET2(bus_property_get_dns_over_tls_mode, "s", Manager, manager_get_dns_over_tls_mode, dns_over_tls_mode_to_string); static int bus_property_get_resolv_conf_mode( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { int r; assert(reply); r = resolv_conf_mode(); if (r < 0) { log_warning_errno(r, "Failed to test /etc/resolv.conf mode, ignoring: %m"); return sd_bus_message_append(reply, "s", NULL); } return sd_bus_message_append(reply, "s", resolv_conf_mode_to_string(r)); } static int bus_method_reset_statistics(sd_bus_message *message, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); assert(message); bus_client_log(message, "statistics reset"); dns_manager_reset_statistics(m); return sd_bus_reply_method_return(message, NULL); } static int get_any_link(Manager *m, int ifindex, Link **ret, sd_bus_error *error) { Link *l; assert(m); assert(ret); l = hashmap_get(m->links, INT_TO_PTR(ifindex)); if (!l) return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %i not known", ifindex); *ret = l; return 0; } static int call_link_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) { int ifindex, r; Link *l = NULL; /* avoid false maybe-uninitialized warning */ assert(m); assert(message); assert(handler); r = bus_message_read_ifindex(message, error, &ifindex); if (r < 0) return r; r = get_any_link(m, ifindex, &l, error); if (r < 0) return r; return handler(message, l, error); } static int bus_method_set_link_dns_servers(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_dns_servers, error); } static int bus_method_set_link_dns_servers_ex(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_dns_servers_ex, error); } static int bus_method_set_link_domains(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_domains, error); } static int bus_method_set_link_default_route(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_default_route, error); } static int bus_method_set_link_llmnr(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_llmnr, error); } static int bus_method_set_link_mdns(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_mdns, error); } static int bus_method_set_link_dns_over_tls(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_dns_over_tls, error); } static int bus_method_set_link_dnssec(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_dnssec, error); } static int bus_method_set_link_dnssec_negative_trust_anchors(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_set_dnssec_negative_trust_anchors, error); } static int bus_method_revert_link(sd_bus_message *message, void *userdata, sd_bus_error *error) { return call_link_method(userdata, message, bus_link_method_revert, error); } static int bus_method_get_link(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_free_ char *p = NULL; Manager *m = ASSERT_PTR(userdata); int r, ifindex; Link *l = NULL; /* avoid false maybe-uninitialized warning */ assert(message); r = bus_message_read_ifindex(message, error, &ifindex); if (r < 0) return r; r = get_any_link(m, ifindex, &l, error); if (r < 0) return r; p = link_bus_path(l); if (!p) return -ENOMEM; return sd_bus_reply_method_return(message, "o", p); } static int bus_method_flush_caches(sd_bus_message *message, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); assert(message); bus_client_log(message, "cache flush"); manager_flush_caches(m, LOG_INFO); return sd_bus_reply_method_return(message, NULL); } static int bus_method_reset_server_features(sd_bus_message *message, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); assert(message); bus_client_log(message, "server feature reset"); (void) dns_stream_disconnect_all(m); manager_reset_server_features(m); return sd_bus_reply_method_return(message, NULL); } static int dnssd_registered_service_on_bus_track(sd_bus_track *t, void *userdata) { DnssdRegisteredService *s = ASSERT_PTR(userdata); assert(t); log_debug("Client of active request vanished, destroying DNS-SD service."); dnssd_registered_service_free(s); return 0; } static int bus_method_register_service(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; _cleanup_(dnssd_registered_service_freep) DnssdRegisteredService *service = NULL; _cleanup_(sd_bus_track_unrefp) sd_bus_track *bus_track = NULL; const char *id, *name_template, *type; _cleanup_free_ char *path = NULL; DnssdRegisteredService *s = NULL; Manager *m = ASSERT_PTR(userdata); uid_t euid; int r; assert(message); if (m->mdns_support != RESOLVE_SUPPORT_YES) return sd_bus_error_set(error, SD_BUS_ERROR_NOT_SUPPORTED, "Support for MulticastDNS is disabled"); service = new0(DnssdRegisteredService, 1); if (!service) return log_oom(); r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds); if (r < 0) return r; r = sd_bus_creds_get_euid(creds, &euid); if (r < 0) return r; service->originator = euid; service->config_source = RESOLVE_CONFIG_SOURCE_DBUS; r = sd_bus_message_read(message, "sssqqq", &id, &name_template, &type, &service->port, &service->priority, &service->weight); if (r < 0) return r; if (!filename_part_is_valid(id)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "DNS-SD service identifier '%s' is invalid", id); if (!dnssd_srv_type_is_valid(type)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "DNS-SD service type '%s' is invalid", type); s = hashmap_get(m->dnssd_registered_services, id); if (s) return sd_bus_error_setf(error, BUS_ERROR_DNSSD_SERVICE_EXISTS, "DNS-SD service '%s' exists already", id); service->id = strdup(id); if (!service->id) return log_oom(); service->name_template = strdup(name_template); if (!service->name_template) return log_oom(); service->type = strdup(type); if (!service->type) return log_oom(); r = dnssd_render_instance_name(m, service, NULL); if (r < 0) return r; r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "a{say}"); if (r < 0) return r; while ((r = sd_bus_message_enter_container(message, SD_BUS_TYPE_ARRAY, "{say}")) > 0) { _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; DnsTxtItem *last = NULL; txt_data = new0(DnssdTxtData, 1); if (!txt_data) return log_oom(); while ((r = sd_bus_message_enter_container(message, SD_BUS_TYPE_DICT_ENTRY, "say")) > 0) { const char *key; const void *value; size_t size; DnsTxtItem *i; r = sd_bus_message_read(message, "s", &key); if (r < 0) return r; if (isempty(key)) return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Keys in DNS-SD TXT RRs can't be empty"); if (!ascii_is_valid(key)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "TXT key '%s' contains non-ASCII symbols", key); r = sd_bus_message_read_array(message, 'y', &value, &size); if (r < 0) return r; r = dnssd_txt_item_new_from_data(key, value, size, &i); if (r < 0) return r; LIST_INSERT_AFTER(items, txt_data->txts, last, i); last = i; r = sd_bus_message_exit_container(message); if (r < 0) return r; } if (r < 0) return r; r = sd_bus_message_exit_container(message); if (r < 0) return r; if (txt_data->txts) { LIST_PREPEND(items, service->txt_data_items, txt_data); txt_data = NULL; } } if (r < 0) return r; r = sd_bus_message_exit_container(message); if (r < 0) return r; if (!service->txt_data_items) { _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; txt_data = new0(DnssdTxtData, 1); if (!txt_data) return log_oom(); r = dns_txt_item_new_empty(&txt_data->txts); if (r < 0) return r; LIST_PREPEND(items, service->txt_data_items, txt_data); txt_data = NULL; } r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", service->id, &path); if (r < 0) return r; r = bus_verify_polkit_async( message, "org.freedesktop.resolve1.register-service", /* details= */ NULL, &m->polkit_registry, error); if (r < 0) return r; if (r == 0) return 1; /* Polkit will call us back */ r = hashmap_ensure_put(&m->dnssd_registered_services, &string_hash_ops, service->id, service); if (r < 0) return r; r = sd_bus_track_new(sd_bus_message_get_bus(message), &bus_track, dnssd_registered_service_on_bus_track, service); if (r < 0) return r; r = sd_bus_track_add_sender(bus_track, message); if (r < 0) return r; service->manager = m; service = NULL; manager_refresh_rrs(m); return sd_bus_reply_method_return(message, "o", path); } static int call_dnssd_method(Manager *m, sd_bus_message *message, sd_bus_message_handler_t handler, sd_bus_error *error) { _cleanup_free_ char *name = NULL; DnssdRegisteredService *s = NULL; const char *path; int r; assert(m); assert(message); assert(handler); r = sd_bus_message_read(message, "o", &path); if (r < 0) return r; r = sd_bus_path_decode(path, "/org/freedesktop/resolve1/dnssd", &name); if (r == 0) return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DNSSD_SERVICE, "DNS-SD service with object path '%s' does not exist", path); if (r < 0) return r; s = hashmap_get(m->dnssd_registered_services, name); if (!s) return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DNSSD_SERVICE, "DNS-SD service '%s' not known", name); return handler(message, s, error); } static int bus_method_unregister_service(sd_bus_message *message, void *userdata, sd_bus_error *error) { Manager *m = ASSERT_PTR(userdata); assert(message); return call_dnssd_method(m, message, bus_dnssd_method_unregister, error); } static int bus_method_get_delegate(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_free_ char *p = NULL; Manager *m = ASSERT_PTR(userdata); int r; assert(message); const char *id; r = sd_bus_message_read(message, "s", &id); if (r < 0) return r; DnsDelegate *d = hashmap_get(m->delegates, id); if (!d) return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_DELEGATE, "Delegate '%s' not known", id); p = dns_delegate_bus_path(d); if (!p) return -ENOMEM; return sd_bus_reply_method_return(message, "o", p); } static int bus_method_list_delegates(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; Manager *m = ASSERT_PTR(userdata); int r; assert(message); r = sd_bus_message_new_method_return(message, &reply); if (r < 0) return r; r = sd_bus_message_open_container(reply, 'a', "(so)"); if (r < 0) return r; DnsDelegate *d; HASHMAP_FOREACH(d, m->delegates) { _cleanup_free_ char *p = NULL; p = dns_delegate_bus_path(d); if (!p) return -ENOMEM; r = sd_bus_message_append(reply, "(so)", d->id, p); if (r < 0) return r; } r = sd_bus_message_close_container(reply); if (r < 0) return r; return sd_bus_message_send(reply); } static const sd_bus_vtable resolve_vtable[] = { SD_BUS_VTABLE_START(0), SD_BUS_PROPERTY("LLMNRHostname", "s", NULL, offsetof(Manager, llmnr_hostname), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("LLMNR", "s", bus_property_get_resolve_support, offsetof(Manager, llmnr_support), 0), SD_BUS_PROPERTY("MulticastDNS", "s", bus_property_get_resolve_support, offsetof(Manager, mdns_support), 0), SD_BUS_PROPERTY("DNSOverTLS", "s", bus_property_get_dns_over_tls_mode, 0, 0), SD_BUS_PROPERTY("DNS", "a(iiay)", bus_property_get_dns_servers, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("DNSEx", "a(iiayqs)", bus_property_get_dns_servers_ex, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("FallbackDNS", "a(iiay)", bus_property_get_fallback_dns_servers, offsetof(Manager, fallback_dns_servers), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("FallbackDNSEx", "a(iiayqs)", bus_property_get_fallback_dns_servers_ex, offsetof(Manager, fallback_dns_servers), SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("CurrentDNSServer", "(iiay)", bus_property_get_current_dns_server, offsetof(Manager, current_dns_server), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("CurrentDNSServerEx", "(iiayqs)", bus_property_get_current_dns_server_ex, offsetof(Manager, current_dns_server), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("Domains", "a(isb)", bus_property_get_domains, 0, 0), SD_BUS_PROPERTY("TransactionStatistics", "(tt)", bus_property_get_transaction_statistics, 0, 0), SD_BUS_PROPERTY("CacheStatistics", "(ttt)", bus_property_get_cache_statistics, 0, 0), SD_BUS_PROPERTY("DNSSEC", "s", bus_property_get_dnssec_mode, 0, 0), SD_BUS_PROPERTY("DNSSECStatistics", "(tttt)", bus_property_get_dnssec_statistics, 0, 0), SD_BUS_PROPERTY("DNSSECSupported", "b", bus_property_get_dnssec_supported, 0, 0), SD_BUS_PROPERTY("DNSSECNegativeTrustAnchors", "as", bus_property_get_string_set, offsetof(Manager, trust_anchor.negative_by_name), 0), SD_BUS_PROPERTY("DNSStubListener", "s", bus_property_get_dns_stub_listener_mode, offsetof(Manager, dns_stub_listener_mode), 0), SD_BUS_PROPERTY("ResolvConfMode", "s", bus_property_get_resolv_conf_mode, 0, 0), SD_BUS_METHOD_WITH_ARGS("ResolveHostname", SD_BUS_ARGS("i", ifindex, "s", name, "i", family, "t", flags), SD_BUS_RESULT("a(iiay)", addresses, "s", canonical, "t", flags), bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("ResolveAddress", SD_BUS_ARGS("i", ifindex, "i", family, "ay", address, "t", flags), SD_BUS_RESULT("a(is)", names, "t", flags), bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("ResolveRecord", SD_BUS_ARGS("i", ifindex, "s", name, "q", class, "q", type, "t", flags), SD_BUS_RESULT("a(iqqay)", records, "t", flags), bus_method_resolve_record, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("ResolveService", SD_BUS_ARGS("i", ifindex, "s", name, "s", type, "s", domain, "i", family, "t", flags), SD_BUS_RESULT("a(qqqsa(iiay)s)", srv_data, "aay", txt_data, "s", canonical_name, "s", canonical_type, "s", canonical_domain, "t", flags), bus_method_resolve_service, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("GetLink", SD_BUS_ARGS("i", ifindex), SD_BUS_RESULT("o", path), bus_method_get_link, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDNS", SD_BUS_ARGS("i", ifindex, "a(iay)", addresses), SD_BUS_NO_RESULT, bus_method_set_link_dns_servers, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDNSEx", SD_BUS_ARGS("i", ifindex, "a(iayqs)", addresses), SD_BUS_NO_RESULT, bus_method_set_link_dns_servers_ex, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDomains", SD_BUS_ARGS("i", ifindex, "a(sb)", domains), SD_BUS_NO_RESULT, bus_method_set_link_domains, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDefaultRoute", SD_BUS_ARGS("i", ifindex, "b", enable), SD_BUS_NO_RESULT, bus_method_set_link_default_route, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkLLMNR", SD_BUS_ARGS("i", ifindex, "s", mode), SD_BUS_NO_RESULT, bus_method_set_link_llmnr, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkMulticastDNS", SD_BUS_ARGS("i", ifindex, "s", mode), SD_BUS_NO_RESULT, bus_method_set_link_mdns, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDNSOverTLS", SD_BUS_ARGS("i", ifindex, "s", mode), SD_BUS_NO_RESULT, bus_method_set_link_dns_over_tls, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSEC", SD_BUS_ARGS("i", ifindex, "s", mode), SD_BUS_NO_RESULT, bus_method_set_link_dnssec, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("SetLinkDNSSECNegativeTrustAnchors", SD_BUS_ARGS("i", ifindex, "as", names), SD_BUS_NO_RESULT, bus_method_set_link_dnssec_negative_trust_anchors, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("RevertLink", SD_BUS_ARGS("i", ifindex), SD_BUS_NO_RESULT, bus_method_revert_link, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("RegisterService", SD_BUS_ARGS("s", id, "s", name_template, "s", type, "q", service_port, "q", service_priority, "q", service_weight, "aa{say}", txt_datas), SD_BUS_RESULT("o", service_path), bus_method_register_service, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("UnregisterService", SD_BUS_ARGS("o", service_path), SD_BUS_NO_RESULT, bus_method_unregister_service, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("ResetStatistics", SD_BUS_NO_ARGS, SD_BUS_NO_RESULT, bus_method_reset_statistics, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("FlushCaches", SD_BUS_NO_ARGS, SD_BUS_NO_RESULT, bus_method_flush_caches, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("ResetServerFeatures", SD_BUS_NO_ARGS, SD_BUS_NO_RESULT, bus_method_reset_server_features, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("GetDelegate", SD_BUS_ARGS("s", id), SD_BUS_RESULT("o", path), bus_method_get_delegate, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_ARGS("ListDelegates", SD_BUS_NO_ARGS, SD_BUS_RESULT("a(so)", delegates), bus_method_list_delegates, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_VTABLE_END, }; const BusObjectImplementation manager_object = { "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", .vtables = BUS_VTABLES(resolve_vtable), .children = BUS_IMPLEMENTATIONS(&link_object, &dnssd_object, &dns_delegate_object), }; static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) { Manager *m = ASSERT_PTR(userdata); int b, r; assert(message); r = sd_bus_message_read(message, "b", &b); if (r < 0) { bus_log_parse_error(r); return 0; } if (b) return 0; log_debug("Coming back from suspend, closing all TCP connections..."); (void) dns_stream_disconnect_all(m); log_debug("Coming back from suspend, resetting all probed server features..."); manager_reset_server_features(m); log_debug("Coming back from suspend, verifying all RRs..."); manager_verify_all(m); return 0; } int manager_connect_bus(Manager *m) { int r; assert(m); if (m->bus) return 0; r = bus_open_system_watch_bind_with_description(&m->bus, "bus-api-resolve"); if (r < 0) return log_error_errno(r, "Failed to connect to system bus: %m"); r = bus_add_implementation(m->bus, &manager_object, m); if (r < 0) return r; r = bus_log_control_api_register(m->bus); if (r < 0) return r; r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.resolve1", 0, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to request name: %m"); r = sd_bus_attach_event(m->bus, m->event, 0); if (r < 0) return log_error_errno(r, "Failed to attach bus to event loop: %m"); r = bus_match_signal_async( m->bus, NULL, bus_login_mgr, "PrepareForSleep", match_prepare_for_sleep, NULL, m); if (r < 0) log_warning_errno(r, "Failed to request match for PrepareForSleep, ignoring: %m"); return 0; } int manager_send_changed_strv(Manager *manager, char **properties) { assert(manager); if (sd_bus_is_ready(manager->bus) <= 0) return 0; int r = sd_bus_emit_properties_changed_strv( manager->bus, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", properties); if (r < 0) log_notice_errno(r, "Failed to emit notification about changed properties: %m"); return r; }