diff options
Diffstat (limited to 'src/resolve/resolved-bus.c')
| -rw-r--r-- | src/resolve/resolved-bus.c | 2285 |
1 files changed, 2285 insertions, 0 deletions
diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c new file mode 100644 index 0000000..1ef25ac --- /dev/null +++ b/src/resolve/resolved-bus.c @@ -0,0 +1,2285 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#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-polkit.h" +#include "dns-domain.h" +#include "format-util.h" +#include "memory-util.h" +#include "missing_capability.h" +#include "resolved-bus.h" +#include "resolved-def.h" +#include "resolved-dns-synthesize.h" +#include "resolved-dnssd-bus.h" +#include "resolved-dnssd.h" +#include "resolved-link-bus.h" +#include "resolved-resolv-conf.h" +#include "socket-netlink.h" +#include "stdio-util.h" +#include "strv.h" +#include "syslog-util.h" +#include "user-util.h" +#include "utf8.h" + +BUS_DEFINE_PROPERTY_GET_ENUM(bus_property_get_resolve_support, resolve_support, ResolveSupport); + +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", + dnssec_result_to_string(q->answer_dnssec_result)); + + 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", dns_query_string(q), rc); + } + + 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 validate_and_mangle_flags( + const char *name, + uint64_t *flags, + uint64_t ok, + sd_bus_error *error) { + + assert(flags); + + /* Checks that the client supplied interface index and flags parameter actually are valid and make + * sense in our method call context. Specifically: + * + * 1. Checks that the interface index is either 0 (meaning *all* interfaces) or positive + * + * 2. Only the protocols flags and a bunch of NO_XYZ flags are set, at most. Plus additional flags + * specific to our method, passed in the "ok" parameter. + * + * 3. If zero protocol flags are specified it is automatically turned into *all* protocols. This way + * clients can simply pass 0 as flags and all will work as it should. They can also use this so + * that clients don't have to know all the protocols resolved implements, but can just specify 0 + * to mean "all supported protocols". + */ + + if (*flags & ~(SD_RESOLVED_PROTOCOLS_ALL| + SD_RESOLVED_NO_CNAME| + SD_RESOLVED_NO_VALIDATE| + SD_RESOLVED_NO_SYNTHESIZE| + SD_RESOLVED_NO_CACHE| + SD_RESOLVED_NO_ZONE| + SD_RESOLVED_NO_TRUST_ANCHOR| + SD_RESOLVED_NO_NETWORK| + SD_RESOLVED_NO_STALE| + ok)) + return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid flags parameter"); + + if ((*flags & SD_RESOLVED_PROTOCOLS_ALL) == 0) /* If no protocol is enabled, enable all */ + *flags |= SD_RESOLVED_PROTOCOLS_ALL; + + /* Imply SD_RESOLVED_NO_SEARCH if permitted and name is dot suffixed. */ + if (name && FLAGS_SET(ok, SD_RESOLVED_NO_SEARCH) && dns_name_dot_suffixed(name) > 0) + *flags |= SD_RESOLVED_NO_SEARCH; + + return 0; +} + +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); + + r = validate_and_mangle_flags(hostname, &flags, SD_RESOLVED_NO_SEARCH, error); + if (r < 0) + return r; + + 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(m, &q, question_utf8, question_idna ?: question_utf8, NULL, ifindex, flags); + 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"); + + r = validate_and_mangle_flags(NULL, &flags, 0, error); + if (r < 0) + return r; + + r = dns_question_new_reverse(&question, family, &a); + if (r < 0) + return r; + + bus_client_log(message, "address resolution"); + + r = dns_query_new(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH); + 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_transer(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); + + r = validate_and_mangle_flags(name, &flags, 0, error); + if (r < 0) + return r; + + 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(m, &q, question, question, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH|SD_RESOLVED_CLAMP_TTL); + 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->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) { + + 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; + break; + } + } + + 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; + + 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 < 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."); + + r = validate_and_mangle_flags(name, &flags, SD_RESOLVED_NO_TXT|SD_RESOLVED_NO_ADDRESS, error); + if (r < 0) + return r; + + 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(m, &q, question_utf8, question_idna, NULL, ifindex, flags|SD_RESOLVED_NO_SEARCH); + 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; + + 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; + + 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"); + + manager_reset_server_features(m); + + return sd_bus_reply_method_return(message, NULL); +} + +static int dnssd_service_on_bus_track(sd_bus_track *t, void *userdata) { + DnssdService *s = ASSERT_PTR(userdata); + + assert(t); + + log_debug("Client of active request vanished, destroying DNS-SD service."); + dnssd_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_service_freep) DnssdService *service = NULL; + _cleanup_(sd_bus_track_unrefp) sd_bus_track *bus_track = NULL; + const char *name, *name_template, *type; + _cleanup_free_ char *path = NULL; + DnssdService *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(DnssdService, 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; + + r = sd_bus_message_read(message, "sssqqq", &name, &name_template, &type, + &service->port, &service->priority, + &service->weight); + if (r < 0) + return r; + + s = hashmap_get(m->dnssd_services, name); + if (s) + return sd_bus_error_setf(error, BUS_ERROR_DNSSD_SERVICE_EXISTS, "DNS-SD service '%s' exists already", name); + + 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); + + service->name = strdup(name); + if (!service->name) + 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->name, &path); + if (r < 0) + return r; + + r = bus_verify_polkit_async(message, CAP_SYS_ADMIN, + "org.freedesktop.resolve1.register-service", + NULL, false, UID_INVALID, + &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_services, &string_hash_ops, service->name, service); + if (r < 0) + return r; + + r = sd_bus_track_new(sd_bus_message_get_bus(message), &bus_track, dnssd_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; + DnssdService *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_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 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", name, + "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_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), +}; + +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, 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(Manager *manager, const char *property, ...) { + assert(manager); + + if (sd_bus_is_ready(manager->bus) <= 0) + return 0; + + char **l = strv_from_stdarg_alloca(property); + + int r = sd_bus_emit_properties_changed_strv( + manager->bus, + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + l); + if (r < 0) + log_notice_errno(r, "Failed to emit notification about changed property %s: %m", property); + return r; +} |