#include "alloc-util.h"

#include "bus-common-errors.h"

#include "bus-get-properties.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 = userdata;

assert(t);

assert(q);

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(

...) {

_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(

...) {

_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

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", "'%s' not found", dns_query_string(q));

else {

const char *rc, *n;

char p[DECIMAL_STR_MAX(q->answer_rcode)];

rc = dns_rcode_to_string(q->answer_rcode);

if (!rc) {

xsprintf(p, "%i", q->answer_rcode);

rc = p;

}

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

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(

sd_bus_error *error) {

assert(flags);

/* Checks that the client supplied interface index and flags parameter actually are valid and make

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|

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,

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

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 = userdata;

const char *hostname;

int family, ifindex;

uint64_t flags;

int r;

assert(message);

assert(m);

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) {

_cleanup_free_ char *ip = NULL;

(void) in_addr_to_string(q->request_family, &q->request_address, &ip);

r = reply_method_errorf(q, BUS_ERROR_NO_SUCH_RR,

"Address '%s' does not have any RR of requested type", strnull(ip));

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 = userdata;

union in_addr_union a;

int family, ifindex;

uint64_t flags;

int r;

assert(message);

assert(m);

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 = userdata;

uint16_t class, type;

const char *name;

int r, ifindex;

uint64_t flags;

assert(message);

assert(m);

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,

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

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

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);