#include "alloc-util.h"

#include "bus-common-errors.h"

#include "bus-util.h"

#include "dns-domain.h"

#include "resolved-bus.h"

#include "resolved-def.h"

static int reply_query_state(DnsQuery *q) {

_cleanup_free_ char *ip = NULL;

const char *name;

int r;

if (q->request_address_valid) {

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

if (r < 0)

return r;

name = ip;

} else

name = dns_question_first_name(q->question);

switch (q->state) {

case DNS_TRANSACTION_NO_SERVERS:

return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_NAME_SERVERS, "No appropriate name servers or networks for name found");

case DNS_TRANSACTION_TIMEOUT:

return sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "Query timed out");

case DNS_TRANSACTION_ATTEMPTS_MAX_REACHED:

return sd_bus_reply_method_errorf(q->request, SD_BUS_ERROR_TIMEOUT, "All attempts to contact name servers or networks failed");

case DNS_TRANSACTION_INVALID_REPLY:

return sd_bus_reply_method_errorf(q->request, BUS_ERROR_INVALID_REPLY, "Received invalid reply");

case DNS_TRANSACTION_RESOURCES:

return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_RESOURCES, "Not enough resources");

case DNS_TRANSACTION_ABORTED:

return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "Query aborted");

case DNS_TRANSACTION_DNSSEC_FAILED:

return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "DNSSEC validation failed");

case DNS_TRANSACTION_RCODE_FAILURE: {

_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;

if (q->answer_rcode == DNS_RCODE_NXDOMAIN)

sd_bus_error_setf(&error, _BUS_ERROR_DNS "NXDOMAIN", "'%s' not found", name);

else {

const char *rc, *n;

char p[3]; /* the rcode is 4 bits long */

rc = dns_rcode_to_string(q->answer_rcode);

if (!rc) {

sprintf(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", name, rc);

}

return sd_bus_reply_method_error(q->request, &error);

}

case DNS_TRANSACTION_NULL:

case DNS_TRANSACTION_PENDING:

case DNS_TRANSACTION_SUCCESS:

default:

assert_not_reached("Impossible state");

}

}

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 *q) {

_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;

_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;

unsigned added = 0;

int r;

assert(q);

if (q->state != DNS_TRANSACTION_SUCCESS) {

r = reply_query_state(q);

goto finish;

}

r = dns_query_process_cname(q);

if (r == -ELOOP) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));

goto finish;

}

if (r < 0)

goto finish;

if (r > 0) /* This was a cname, and the query was restarted. */

return;

r = sd_bus_message_new_method_return(q->request, &reply);

if (r < 0)

goto finish;

r = sd_bus_message_open_container(reply, 'a', "(iiay)");

if (r < 0)

goto finish;

if (q->answer) {

DnsResourceRecord *rr;

int ifindex;

DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {

r = dns_question_matches_rr(q->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 = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));

goto finish;

}

r = sd_bus_message_close_container(reply);

if (r < 0)

goto finish;

/* Return the precise spelling and uppercasing and CNAME target reported by the server */

assert(canonical);

r = sd_bus_message_append(

reply, "st",

DNS_RESOURCE_KEY_NAME(canonical->key),

SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));

if (r < 0)

goto finish;

r = sd_bus_send(q->manager->bus, reply, NULL);

finish:

if (r < 0) {

log_error_errno(r, "Failed to send hostname reply: %m");

sd_bus_reply_method_errno(q->request, r, NULL);

}

dns_query_free(q);

}

static int check_ifindex_flags(int ifindex, uint64_t *flags, uint64_t ok, sd_bus_error *error) {

assert(flags);

if (ifindex < 0)

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid interface index");

if (*flags & ~(SD_RESOLVED_PROTOCOLS_ALL|SD_RESOLVED_NO_CNAME|ok))

return sd_bus_error_setf(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;

return 0;

}

static int bus_method_resolve_hostname(sd_bus_message *message, void *userdata, sd_bus_error *error) {

_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;

Manager *m = userdata;

const char *hostname;

int family, ifindex;

uint64_t flags;

DnsQuery *q;

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 (!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 = 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 = check_ifindex_flags(ifindex, &flags, SD_RESOLVED_NO_SEARCH, error);

if (r < 0)

return r;

r = dns_question_new_address(&question, family, hostname);

if (r < 0)

return r;

r = dns_query_new(m, &q, question, ifindex, flags);

if (r < 0)

return r;

q->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)

goto fail;

r = dns_query_go(q);

if (r < 0)

goto fail;

return 1;

fail:

dns_query_free(q);

return r;

}

static void bus_method_resolve_address_complete(DnsQuery *q) {

_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;

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(q);

if (r == -ELOOP) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));

goto finish;

}

if (r < 0)

goto finish;

if (r > 0) /* This was a cname, and the query was restarted. */

return;

r = sd_bus_message_new_method_return(q->request, &reply);

if (r < 0)

goto finish;

r = sd_bus_message_open_container(reply, 'a', "(is)");

if (r < 0)

goto finish;

if (q->answer) {

DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {

r = dns_question_matches_rr(q->question, rr, NULL);

if (r < 0)

goto finish;

if (r == 0)

continue;

r = sd_bus_message_append(reply, "(is)", ifindex, rr->ptr.name);

if (r < 0)

goto finish;

added ++;

}

}

if (added <= 0) {

_cleanup_free_ char *ip = NULL;

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

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Address '%s' does not have any RR of requested type", strna(ip));

goto finish;

}

r = sd_bus_message_close_container(reply);

if (r < 0)

goto finish;

r = sd_bus_message_append(reply, "t", SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));

if (r < 0)

goto finish;

r = sd_bus_send(q->manager->bus, reply, NULL);

finish:

if (r < 0) {

log_error_errno(r, "Failed to send address reply: %m");

sd_bus_reply_method_errno(q->request, r, NULL);

}

dns_query_free(q);

}

static int bus_method_resolve_address(sd_bus_message *message, void *userdata, sd_bus_error *error) {

_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;

Manager *m = userdata;

int family, ifindex;

uint64_t flags;

const void *d;

DnsQuery *q;

size_t sz;

int r;

assert(message);

assert(m);

assert_cc(sizeof(int) == sizeof(int32_t));

r = sd_bus_message_read(message, "ii", &ifindex, &family);

if (r < 0)

return r;

if (!IN_SET(family, AF_INET, AF_INET6))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown address family %i", family);

r = sd_bus_message_read_array(message, 'y', &d, &sz);

if (r < 0)

return r;

if (sz != FAMILY_ADDRESS_SIZE(family))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid address size");

r = sd_bus_message_read(message, "t", &flags);

if (r < 0)

return r;

r = check_ifindex_flags(ifindex, &flags, 0, error);

if (r < 0)

return r;

r = dns_question_new_reverse(&question, family, d);

if (r < 0)

return r;

r = dns_query_new(m, &q, question, ifindex, flags|SD_RESOLVED_NO_SEARCH);

if (r < 0)

return r;

q->request = sd_bus_message_ref(message);

q->request_family = family;

memcpy(&q->request_address, d, sz);

q->complete = bus_method_resolve_address_complete;

r = dns_query_bus_track(q, message);

if (r < 0)

goto fail;

r = dns_query_go(q);

if (r < 0)

goto fail;

return 1;

fail:

dns_query_free(q);

return r;

}

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 *q) {

_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;

unsigned added = 0;

int r;

assert(q);

if (q->state != DNS_TRANSACTION_SUCCESS) {

r = reply_query_state(q);

goto finish;

}

r = dns_query_process_cname(q);

if (r == -ELOOP) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));

goto finish;

}

if (r < 0)

goto finish;

if (r > 0) /* Following a CNAME */

return;

r = sd_bus_message_new_method_return(q->request, &reply);

if (r < 0)

goto finish;

r = sd_bus_message_open_container(reply, 'a', "(iqqay)");

if (r < 0)

goto finish;

if (q->answer) {

DnsResourceRecord *rr;

int ifindex;

DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {

r = dns_question_matches_rr(q->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 = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "Name '%s' does not have any RR of the requested type", dns_question_first_name(q->question));

goto finish;

}

r = sd_bus_message_close_container(reply);

if (r < 0)

goto finish;

r = sd_bus_message_append(reply, "t", SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));

if (r < 0)

goto finish;

r = sd_bus_send(q->manager->bus, reply, NULL);

finish:

if (r < 0) {

log_error_errno(r, "Failed to send record reply: %m");

sd_bus_reply_method_errno(q->request, r, NULL);

}

dns_query_free(q);

}

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;

Manager *m = userdata;

uint16_t class, type;

const char *name;

int r, ifindex;

uint64_t flags;

DnsQuery *q;

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;

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, "Invalid RR type for query %" PRIu16, type);

r = check_ifindex_flags(ifindex, &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);

if (r < 0)

return r;

r = dns_query_new(m, &q, question, ifindex, flags|SD_RESOLVED_NO_SEARCH);

if (r < 0)

return r;

q->request = sd_bus_message_ref(message);

q->complete = bus_method_resolve_record_complete;

r = dns_query_bus_track(q, message);

if (r < 0)

goto fail;

r = dns_query_go(q);

if (r < 0)

goto fail;

return 1;

fail:

dns_query_free(q);

return r;

}

static int append_srv(DnsQuery *q, sd_bus_message *reply, DnsResourceRecord *rr) {

_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *canonical = NULL;

DnsQuery *aux;

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;

if (aux->state != DNS_TRANSACTION_SUCCESS)

continue;

if (aux->auxiliary_result != 0)

continue;

r = dns_name_equal(dns_question_first_name(aux->question), rr->srv.name);

if (r < 0)

return r;

if (r == 0)

continue;

DNS_ANSWER_FOREACH(zz, aux->answer) {

r = dns_question_matches_rr(aux->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 = sd_bus_message_append(

reply,

"qqqs",

rr->srv.priority, rr->srv.weight, rr->srv.port, rr->srv.name);

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;

int ifindex;

if (aux->state != DNS_TRANSACTION_SUCCESS)

continue;

if (aux->auxiliary_result != 0)

continue;

r = dns_name_equal(dns_question_first_name(aux->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(aux->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;

/* Note that above we appended the hostname as encoded in the

r = sd_bus_message_append(reply, "s", canonical ? DNS_RESOURCE_KEY_NAME(canonical->key) : rr->srv.name);

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) {

DnsTxtItem *i;

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 *q) {

_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;

DnsQuery *aux;

unsigned added = false;

int r;

assert(q);

if (q->block_all_complete > 0)

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 */

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 = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(bad->question));

goto finish;

}

r = bad->auxiliary_result;

goto finish;

}

r = reply_query_state(bad);

goto finish;

}

}

r = sd_bus_message_new_method_return(q->request, &reply);

if (r < 0)

goto finish;

r = sd_bus_message_open_container(reply, 'a', "(qqqsa(iiay)s)");

if (r < 0)

goto finish;

if (q->answer) {

DnsResourceRecord *rr;

DNS_ANSWER_FOREACH(rr, q->answer) {

r = dns_question_matches_rr(q->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 = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));

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;

if (q->answer) {

DnsResourceRecord *rr;

DNS_ANSWER_FOREACH(rr, q->answer) {

r = dns_question_matches_rr(q->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,

SD_RESOLVED_FLAGS_MAKE(q->answer_protocol, q->answer_family, q->answer_authenticated));

if (r < 0)

goto finish;

r = sd_bus_send(q->manager->bus, reply, NULL);

finish:

if (r < 0) {

log_error_errno(r, "Failed to send service reply: %m");

sd_bus_reply_method_errno(q->request, r, NULL);

}

dns_query_free(q);

}

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(q);

if (r > 0) /* 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;

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;

DnsQuery *aux;

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

r = dns_question_new_address(&question, q->request_family, rr->srv.name);

if (r < 0)

return r;

r = dns_query_new(q->manager, &aux, question, 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,

dns_query_free(aux);

return 0;

}

if (r < 0)

goto fail;

/* Note that auxiliary queries do not track the original bus

r = dns_query_go(aux);

if (r < 0)

goto fail;

return 1;

fail:

dns_query_free(aux);

return r;

}

static void bus_method_resolve_service_complete(DnsQuery *q) {

unsigned found = 0;

int r;

assert(q);

if (q->state != DNS_TRANSACTION_SUCCESS) {

r = reply_query_state(q);

goto finish;

}

r = dns_query_process_cname(q);

if (r == -ELOOP) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_CNAME_LOOP, "CNAME loop detected, or CNAME resolving disabled on '%s'", dns_question_first_name(q->question));

goto finish;

}

if (r < 0)

goto finish;

if (r > 0) /* This was a cname, and the query was restarted. */

return;

if (q->answer) {

DnsResourceRecord *rr;

int ifindex;

DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, q->answer) {

r = dns_question_matches_rr(q->question, rr, NULL);

if (r < 0)

goto finish;

if (r == 0)

continue;

if (rr->key->type != DNS_TYPE_SRV)

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 (found <= 0) {

r = sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_SUCH_RR, "'%s' does not have any RR of the requested type", dns_question_first_name(q->question));

goto finish;

}

/* Maybe we are already finished? check now... */

resolve_service_all_complete(q);

return;

finish:

if (r < 0) {

log_error_errno(r, "Failed to send service reply: %m");

sd_bus_reply_method_errno(q->request, r, NULL);

}

dns_query_free(q);

}

static int bus_method_resolve_service(sd_bus_message *message, void *userdata, sd_bus_error *error) {

_cleanup_(dns_question_unrefp) DnsQuestion *question = NULL;

const char *name, *type, *domain, *joined;

_cleanup_free_ char *n = NULL;

Manager *m = userdata;

int family, ifindex;

uint64_t flags;

DnsQuery *q;

int r;

assert(message);

assert(m);

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 (!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_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Service name cannot be specified without service type.");

r = check_ifindex_flags(ifindex, &flags, SD_RESOLVED_NO_TXT|SD_RESOLVED_NO_ADDRESS, error);

if (r < 0)

return r;

if (type) {

/* If the type is specified, we generate the full domain name to look up ourselves */

r = dns_service_join(name, type, domain, &n);

if (r < 0)

return r;

joined = n;

} else

/* If no type is specified, we assume the domain

joined = domain;

r = dns_question_new_service(&question, joined, !(flags & SD_RESOLVED_NO_TXT));

if (r < 0)

return r;

r = dns_query_new(m, &q, question, ifindex, flags|SD_RESOLVED_NO_SEARCH);

if (r < 0)

return r;

q->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)

goto fail;

r = dns_query_go(q);

if (r < 0)

goto fail;

return 1;

fail:

dns_query_free(q);

return r;

}

static int append_dns_server(sd_bus_message *reply, DnsServer *s) {

int r;

assert(reply);

assert(s);

r = sd_bus_message_open_container(reply, 'r', "iiay");

if (r < 0)

return r;

r = sd_bus_message_append(reply, "ii", s->link ? s->link->ifindex : 0, 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;

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) {

Manager *m = userdata;

unsigned c = 0;

DnsServer *s;

Iterator i;

Link *l;

int r;

assert(reply);

assert(m);

r = sd_bus_message_open_container(reply, 'a', "(iiay)");

if (r < 0)

return r;

LIST_FOREACH(servers, s, m->dns_servers) {

r = append_dns_server(reply, s);

if (r < 0)

return r;

c++;

}

HASHMAP_FOREACH(l, m->links, i) {

LIST_FOREACH(servers, s, l->dns_servers) {

r = append_dns_server(reply, s);

if (r < 0)

return r;

c++;

}

}

if (c == 0) {

LIST_FOREACH(servers, s, m->fallback_dns_servers) {

r = append_dns_server(reply, s);

if (r < 0)

return r;

}

}

return sd_bus_message_close_container(reply);

}

static int bus_property_get_search_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 = userdata;

DnsSearchDomain *d;

Iterator i;

Link *l;

int r;

assert(reply);

assert(m);

r = sd_bus_message_open_container(reply, 'a', "(is)");

if (r < 0)

return r;

LIST_FOREACH(domains, d, m->search_domains) {

r = sd_bus_message_append(reply, "(is)", 0, d->name);

if (r < 0)

return r;

}

HASHMAP_FOREACH(l, m->links, i) {

LIST_FOREACH(domains, d, l->search_domains) {

r = sd_bus_message_append(reply, "is", l->ifindex, d->name);

if (r < 0)

return r;

}

}

return sd_bus_message_close_container(reply);

}

static const sd_bus_vtable resolve_vtable[] = {

SD_BUS_VTABLE_START(0),

SD_BUS_PROPERTY("LLMNRHostname", "s", NULL, offsetof(Manager, llmnr_hostname), 0),

SD_BUS_PROPERTY("DNSServers", "a(iiay)", bus_property_get_dns_servers, 0, 0),

SD_BUS_PROPERTY("SearchDomains", "a(is)", bus_property_get_search_domains, 0, 0),

SD_BUS_METHOD("ResolveHostname", "isit", "a(iiay)st", bus_method_resolve_hostname, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("ResolveAddress", "iiayt", "a(is)t", bus_method_resolve_address, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("ResolveRecord", "isqqt", "a(iqqay)t", bus_method_resolve_record, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("ResolveService", "isssit", "a(qqqsa(iiay)s)aayssst", bus_method_resolve_service, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_VTABLE_END,

};

static int on_bus_retry(sd_event_source *s, usec_t usec, void *userdata) {

Manager *m = userdata;

assert(s);

assert(m);

m->bus_retry_event_source = sd_event_source_unref(m->bus_retry_event_source);

manager_connect_bus(m);

return 0;

}

static int match_prepare_for_sleep(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {

Manager *m = userdata;

int b, r;

assert(message);

assert(m);

r = sd_bus_message_read(message, "b", &b);

if (r < 0) {

log_debug_errno(r, "Failed to parse PrepareForSleep signal: %m");

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 = sd_bus_default_system(&m->bus);

if (r < 0) {

/* We failed to connect? Yuck, we must be in early

log_debug_errno(r, "Failed to connect to bus, trying again in 5s: %m");

r = sd_event_add_time(m->event, &m->bus_retry_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + 5*USEC_PER_SEC, 0, on_bus_retry, m);

if (r < 0)

return log_error_errno(r, "Failed to install bus reconnect time event: %m");

return 0;

}

r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);

if (r < 0)

return log_error_errno(r, "Failed to register object: %m");

r = sd_bus_request_name(m->bus, "org.freedesktop.resolve1", 0);

if (r < 0)

return log_error_errno(r, "Failed to register 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 = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,

"type='signal',"

"sender='org.freedesktop.login1',"

"interface='org.freedesktop.login1.Manager',"

"member='PrepareForSleep',"

"path='/org/freedesktop/login1'",

match_prepare_for_sleep,

m);

if (r < 0)

log_error_errno(r, "Failed to add match for PrepareForSleep: %m");

return 0;

}