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Systemd/src/resolve/resolved-dns-query.c
Lennart Poettering ad44b56b0f resolved: teach resolved the difference between "routing" and "search" domains 
Following the changes to expose the "routing" and "search" domain concepts in networkd, actually make resolved use
them. It will now use routing domains exclusively for making DNS routing decisions, and use search domains additionally
for extending single-label names.
2016-01-26 14:42:04 +01:00

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "alloc-util.h"
#include "dns-domain.h"
#include "hostname-util.h"
#include "local-addresses.h"
#include "resolved-dns-query.h"
#include "resolved-dns-synthesize.h"
#include "resolved-etc-hosts.h"
#include "string-util.h"
/* How long to wait for the query in total */
#define QUERY_TIMEOUT_USEC (30 * USEC_PER_SEC)
#define CNAME_MAX 8
#define QUERIES_MAX 2048
#define AUXILIARY_QUERIES_MAX 64
static int dns_query_candidate_new(DnsQueryCandidate **ret, DnsQuery *q, DnsScope *s) {
DnsQueryCandidate *c;
assert(ret);
assert(q);
assert(s);
c = new0(DnsQueryCandidate, 1);
if (!c)
return -ENOMEM;
c->query = q;
c->scope = s;
LIST_PREPEND(candidates_by_query, q->candidates, c);
LIST_PREPEND(candidates_by_scope, s->query_candidates, c);
*ret = c;
return 0;
}
static void dns_query_candidate_stop(DnsQueryCandidate *c) {
DnsTransaction *t;
assert(c);
while ((t = set_steal_first(c->transactions))) {
set_remove(t->notify_query_candidates, c);
dns_transaction_gc(t);
}
}
DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c) {
if (!c)
return NULL;
dns_query_candidate_stop(c);
set_free(c->transactions);
dns_search_domain_unref(c->search_domain);
if (c->query)
LIST_REMOVE(candidates_by_query, c->query->candidates, c);
if (c->scope)
LIST_REMOVE(candidates_by_scope, c->scope->query_candidates, c);
free(c);
return NULL;
}
static int dns_query_candidate_next_search_domain(DnsQueryCandidate *c) {
DnsSearchDomain *next = NULL;
assert(c);
if (c->search_domain && c->search_domain->linked)
next = c->search_domain->domains_next;
else
next = dns_scope_get_search_domains(c->scope);
for (;;) {
if (!next) /* We hit the end of the list */
return 0;
if (!next->route_only)
break;
/* Skip over route-only domains */
next = next->domains_next;
}
dns_search_domain_unref(c->search_domain);
c->search_domain = dns_search_domain_ref(next);
return 1;
}
static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResourceKey *key) {
DnsTransaction *t;
int r;
assert(c);
assert(key);
t = dns_scope_find_transaction(c->scope, key, true);
if (!t) {
r = dns_transaction_new(&t, c->scope, key);
if (r < 0)
return r;
} else {
if (set_contains(c->transactions, t))
return 0;
}
r = set_ensure_allocated(&c->transactions, NULL);
if (r < 0)
goto gc;
r = set_ensure_allocated(&t->notify_query_candidates, NULL);
if (r < 0)
goto gc;
r = set_put(t->notify_query_candidates, c);
if (r < 0)
goto gc;
r = set_put(c->transactions, t);
if (r < 0) {
(void) set_remove(t->notify_query_candidates, c);
goto gc;
}
return 1;
gc:
dns_transaction_gc(t);
return r;
}
static int dns_query_candidate_go(DnsQueryCandidate *c) {
DnsTransaction *t;
Iterator i;
int r;
assert(c);
/* Start the transactions that are not started yet */
SET_FOREACH(t, c->transactions, i) {
if (t->state != DNS_TRANSACTION_NULL)
continue;
r = dns_transaction_go(t);
if (r < 0)
return r;
}
return 0;
}
static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) {
DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
DnsTransaction *t;
Iterator i;
assert(c);
if (c->error_code != 0)
return DNS_TRANSACTION_ERRNO;
SET_FOREACH(t, c->transactions, i) {
switch (t->state) {
case DNS_TRANSACTION_NULL:
/* If there's a NULL transaction pending, then
* this means not all transactions where
* started yet, and we were called from within
* the stackframe that is supposed to start
* remaining transactions. In this case,
* simply claim the candidate is pending. */
case DNS_TRANSACTION_PENDING:
case DNS_TRANSACTION_VALIDATING:
/* If there's one transaction currently in
* VALIDATING state, then this means there's
* also one in PENDING state, hence we can
* return PENDING immediately. */
return DNS_TRANSACTION_PENDING;
case DNS_TRANSACTION_SUCCESS:
state = t->state;
break;
default:
if (state != DNS_TRANSACTION_SUCCESS)
state = t->state;
break;
}
}
return state;
}
static int dns_query_candidate_setup_transactions(DnsQueryCandidate *c) {
DnsQuestion *question;
DnsResourceKey *key;
int n = 0, r;
assert(c);
dns_query_candidate_stop(c);
question = dns_query_question_for_protocol(c->query, c->scope->protocol);
/* Create one transaction per question key */
DNS_QUESTION_FOREACH(key, question) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *new_key = NULL;
if (c->search_domain) {
r = dns_resource_key_new_append_suffix(&new_key, key, c->search_domain->name);
if (r < 0)
goto fail;
}
r = dns_query_candidate_add_transaction(c, new_key ?: key);
if (r < 0)
goto fail;
n++;
}
return n;
fail:
dns_query_candidate_stop(c);
return r;
}
void dns_query_candidate_notify(DnsQueryCandidate *c) {
DnsTransactionState state;
int r;
assert(c);
state = dns_query_candidate_state(c);
if (DNS_TRANSACTION_IS_LIVE(state))
return;
if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) {
r = dns_query_candidate_next_search_domain(c);
if (r < 0)
goto fail;
if (r > 0) {
/* OK, there's another search domain to try, let's do so. */
r = dns_query_candidate_setup_transactions(c);
if (r < 0)
goto fail;
if (r > 0) {
/* New transactions where queued. Start them and wait */
r = dns_query_candidate_go(c);
if (r < 0)
goto fail;
return;
}
}
}
dns_query_ready(c->query);
return;
fail:
log_warning_errno(r, "Failed to follow search domains: %m");
c->error_code = r;
dns_query_ready(c->query);
}
static void dns_query_stop(DnsQuery *q) {
DnsQueryCandidate *c;
assert(q);
q->timeout_event_source = sd_event_source_unref(q->timeout_event_source);
LIST_FOREACH(candidates_by_query, c, q->candidates)
dns_query_candidate_stop(c);
}
static void dns_query_free_candidates(DnsQuery *q) {
assert(q);
while (q->candidates)
dns_query_candidate_free(q->candidates);
}
static void dns_query_reset_answer(DnsQuery *q) {
assert(q);
q->answer = dns_answer_unref(q->answer);
q->answer_rcode = 0;
q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
q->answer_errno = 0;
q->answer_authenticated = false;
q->answer_protocol = _DNS_PROTOCOL_INVALID;
q->answer_family = AF_UNSPEC;
q->answer_search_domain = dns_search_domain_unref(q->answer_search_domain);
}
DnsQuery *dns_query_free(DnsQuery *q) {
if (!q)
return NULL;
while (q->auxiliary_queries)
dns_query_free(q->auxiliary_queries);
if (q->auxiliary_for) {
assert(q->auxiliary_for->n_auxiliary_queries > 0);
q->auxiliary_for->n_auxiliary_queries--;
LIST_REMOVE(auxiliary_queries, q->auxiliary_for->auxiliary_queries, q);
}
dns_query_free_candidates(q);
dns_question_unref(q->question_idna);
dns_question_unref(q->question_utf8);
dns_query_reset_answer(q);
sd_bus_message_unref(q->request);
sd_bus_track_unref(q->bus_track);
free(q->request_address_string);
if (q->manager) {
LIST_REMOVE(queries, q->manager->dns_queries, q);
q->manager->n_dns_queries--;
}
free(q);
return NULL;
}
int dns_query_new(
Manager *m,
DnsQuery **ret,
DnsQuestion *question_utf8,
DnsQuestion *question_idna,
int ifindex, uint64_t flags) {
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
DnsResourceKey *key;
bool good = false;
int r;
assert(m);
if (dns_question_size(question_utf8) > 0) {
r = dns_question_is_valid_for_query(question_utf8);
if (r < 0)
return r;
if (r == 0)
return -EINVAL;
good = true;
}
/* If the IDNA and UTF8 questions are the same, merge their references */
r = dns_question_is_equal(question_idna, question_utf8);
if (r < 0)
return r;
if (r > 0)
question_idna = question_utf8;
else {
if (dns_question_size(question_idna) > 0) {
r = dns_question_is_valid_for_query(question_idna);
if (r < 0)
return r;
if (r == 0)
return -EINVAL;
good = true;
}
}
if (!good) /* don't allow empty queries */
return -EINVAL;
if (m->n_dns_queries >= QUERIES_MAX)
return -EBUSY;
q = new0(DnsQuery, 1);
if (!q)
return -ENOMEM;
q->question_utf8 = dns_question_ref(question_utf8);
q->question_idna = dns_question_ref(question_idna);
q->ifindex = ifindex;
q->flags = flags;
q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
q->answer_protocol = _DNS_PROTOCOL_INVALID;
q->answer_family = AF_UNSPEC;
/* First dump UTF8 question */
DNS_QUESTION_FOREACH(key, question_utf8) {
_cleanup_free_ char *p = NULL;
r = dns_resource_key_to_string(key, &p);
if (r < 0)
return r;
log_debug("Looking up RR for %s.", strstrip(p));
}
/* And then dump the IDNA question, but only what hasn't been dumped already through the UTF8 question. */
DNS_QUESTION_FOREACH(key, question_idna) {
_cleanup_free_ char *p = NULL;
r = dns_question_contains(question_utf8, key);
if (r < 0)
return r;
if (r > 0)
continue;
r = dns_resource_key_to_string(key, &p);
if (r < 0)
return r;
log_debug("Looking up IDNA RR for %s.", strstrip(p));
}
LIST_PREPEND(queries, m->dns_queries, q);
m->n_dns_queries++;
q->manager = m;
if (ret)
*ret = q;
q = NULL;
return 0;
}
int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) {
assert(q);
assert(auxiliary_for);
/* Ensure that that the query is not auxiliary yet, and
* nothing else is auxiliary to it either */
assert(!q->auxiliary_for);
assert(!q->auxiliary_queries);
/* Ensure that the unit we shall be made auxiliary for isn't
* auxiliary itself */
assert(!auxiliary_for->auxiliary_for);
if (auxiliary_for->n_auxiliary_queries >= AUXILIARY_QUERIES_MAX)
return -EAGAIN;
LIST_PREPEND(auxiliary_queries, auxiliary_for->auxiliary_queries, q);
q->auxiliary_for = auxiliary_for;
auxiliary_for->n_auxiliary_queries++;
return 0;
}
static void dns_query_complete(DnsQuery *q, DnsTransactionState state) {
assert(q);
assert(!DNS_TRANSACTION_IS_LIVE(state));
assert(DNS_TRANSACTION_IS_LIVE(q->state));
/* Note that this call might invalidate the query. Callers
* should hence not attempt to access the query or transaction
* after calling this function. */
q->state = state;
dns_query_stop(q);
if (q->complete)
q->complete(q);
}
static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) {
DnsQuery *q = userdata;
assert(s);
assert(q);
dns_query_complete(q, DNS_TRANSACTION_TIMEOUT);
return 0;
}
static int dns_query_add_candidate(DnsQuery *q, DnsScope *s) {
DnsQueryCandidate *c;
int r;
assert(q);
assert(s);
r = dns_query_candidate_new(&c, q, s);
if (r < 0)
return r;
/* If this a single-label domain on DNS, we might append a suitable search domain first. */
if ((q->flags & SD_RESOLVED_NO_SEARCH) == 0) {
r = dns_scope_name_needs_search_domain(s, dns_question_first_name(q->question_idna));
if (r < 0)
goto fail;
if (r > 0) {
/* OK, we need a search domain now. Let's find one for this scope */
r = dns_query_candidate_next_search_domain(c);
if (r <= 0) /* if there's no search domain, then we won't add any transaction. */
goto fail;
}
}
r = dns_query_candidate_setup_transactions(c);
if (r < 0)
goto fail;
return 0;
fail:
dns_query_candidate_free(c);
return r;
}
static int dns_query_synthesize_reply(DnsQuery *q, DnsTransactionState *state) {
_cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
int r;
assert(q);
assert(state);
/* Tries to synthesize localhost RR replies (and others) where appropriate. Note that this is done *after* the
* the normal lookup finished. The data from the network hence takes precedence over the data we
* synthesize. (But note that many scopes refuse to resolve certain domain names) */
if (!IN_SET(*state,
DNS_TRANSACTION_RCODE_FAILURE,
DNS_TRANSACTION_NO_SERVERS,
DNS_TRANSACTION_TIMEOUT,
DNS_TRANSACTION_ATTEMPTS_MAX_REACHED,
DNS_TRANSACTION_NETWORK_DOWN,
DNS_TRANSACTION_NOT_FOUND))
return 0;
r = dns_synthesize_answer(
q->manager,
q->question_utf8,
q->ifindex,
&answer);
if (r <= 0)
return r;
dns_query_reset_answer(q);
q->answer = answer;
answer = NULL;
q->answer_rcode = DNS_RCODE_SUCCESS;
q->answer_protocol = dns_synthesize_protocol(q->flags);
q->answer_family = dns_synthesize_family(q->flags);
q->answer_authenticated = true;
*state = DNS_TRANSACTION_SUCCESS;
return 1;
}
static int dns_query_try_etc_hosts(DnsQuery *q) {
_cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
int r;
assert(q);
/* Looks in /etc/hosts for matching entries. Note that this is done *before* the normal lookup is done. The
* data from /etc/hosts hence takes precedence over the network. */
r = manager_etc_hosts_lookup(
q->manager,
q->question_utf8,
&answer);
if (r <= 0)
return r;
dns_query_reset_answer(q);
q->answer = answer;
answer = NULL;
q->answer_rcode = DNS_RCODE_SUCCESS;
q->answer_protocol = dns_synthesize_protocol(q->flags);
q->answer_family = dns_synthesize_family(q->flags);
q->answer_authenticated = true;
return 1;
}
int dns_query_go(DnsQuery *q) {
DnsScopeMatch found = DNS_SCOPE_NO;
DnsScope *s, *first = NULL;
DnsQueryCandidate *c;
int r;
assert(q);
if (q->state != DNS_TRANSACTION_NULL)
return 0;
r = dns_query_try_etc_hosts(q);
if (r < 0)
return r;
if (r > 0) {
dns_query_complete(q, DNS_TRANSACTION_SUCCESS);
return 1;
}
LIST_FOREACH(scopes, s, q->manager->dns_scopes) {
DnsScopeMatch match;
const char *name;
name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol));
if (!name)
continue;
match = dns_scope_good_domain(s, q->ifindex, q->flags, name);
if (match < 0)
return match;
if (match == DNS_SCOPE_NO)
continue;
found = match;
if (match == DNS_SCOPE_YES) {
first = s;
break;
} else {
assert(match == DNS_SCOPE_MAYBE);
if (!first)
first = s;
}
}
if (found == DNS_SCOPE_NO) {
DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
r = dns_query_synthesize_reply(q, &state);
if (r < 0)
return r;
dns_query_complete(q, state);
return 1;
}
r = dns_query_add_candidate(q, first);
if (r < 0)
goto fail;
LIST_FOREACH(scopes, s, first->scopes_next) {
DnsScopeMatch match;
const char *name;
name = dns_question_first_name(dns_query_question_for_protocol(q, s->protocol));
if (!name)
continue;
match = dns_scope_good_domain(s, q->ifindex, q->flags, name);
if (match < 0)
goto fail;
if (match != found)
continue;
r = dns_query_add_candidate(q, s);
if (r < 0)
goto fail;
}
dns_query_reset_answer(q);
r = sd_event_add_time(
q->manager->event,
&q->timeout_event_source,
clock_boottime_or_monotonic(),
now(clock_boottime_or_monotonic()) + QUERY_TIMEOUT_USEC, 0,
on_query_timeout, q);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(q->timeout_event_source, "query-timeout");
q->state = DNS_TRANSACTION_PENDING;
q->block_ready++;
/* Start the transactions */
LIST_FOREACH(candidates_by_query, c, q->candidates) {
r = dns_query_candidate_go(c);
if (r < 0) {
q->block_ready--;
goto fail;
}
}
q->block_ready--;
dns_query_ready(q);
return 1;
fail:
dns_query_stop(q);
return r;
}
static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) {
DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS;
bool has_authenticated = false, has_non_authenticated = false;
DnssecResult dnssec_result_authenticated = _DNSSEC_RESULT_INVALID, dnssec_result_non_authenticated = _DNSSEC_RESULT_INVALID;
DnsTransaction *t;
Iterator i;
int r;
assert(q);
if (!c) {
r = dns_query_synthesize_reply(q, &state);
if (r < 0)
goto fail;
dns_query_complete(q, state);
return;
}
if (c->error_code != 0) {
/* If the candidate had an error condition of its own, start with that. */
state = DNS_TRANSACTION_ERRNO;
q->answer = dns_answer_unref(q->answer);
q->answer_rcode = 0;
q->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
q->answer_errno = c->error_code;
}
SET_FOREACH(t, c->transactions, i) {
switch (t->state) {
case DNS_TRANSACTION_SUCCESS: {
/* We found a successfuly reply, merge it into the answer */
r = dns_answer_extend(&q->answer, t->answer);
if (r < 0)
goto fail;
q->answer_rcode = t->answer_rcode;
q->answer_errno = 0;
if (t->answer_authenticated) {
has_authenticated = true;
dnssec_result_authenticated = t->answer_dnssec_result;
} else {
has_non_authenticated = true;
dnssec_result_non_authenticated = t->answer_dnssec_result;
}
state = DNS_TRANSACTION_SUCCESS;
break;
}
case DNS_TRANSACTION_NULL:
case DNS_TRANSACTION_PENDING:
case DNS_TRANSACTION_VALIDATING:
case DNS_TRANSACTION_ABORTED:
/* Ignore transactions that didn't complete */
continue;
default:
/* Any kind of failure? Store the data away,
* if there's nothing stored yet. */
if (state == DNS_TRANSACTION_SUCCESS)
continue;
q->answer = dns_answer_unref(q->answer);
q->answer_rcode = t->answer_rcode;
q->answer_dnssec_result = t->answer_dnssec_result;
q->answer_errno = t->answer_errno;
state = t->state;
break;
}
}
if (state == DNS_TRANSACTION_SUCCESS) {
q->answer_authenticated = has_authenticated && !has_non_authenticated;
q->answer_dnssec_result = q->answer_authenticated ? dnssec_result_authenticated : dnssec_result_non_authenticated;
}
q->answer_protocol = c->scope->protocol;
q->answer_family = c->scope->family;
dns_search_domain_unref(q->answer_search_domain);
q->answer_search_domain = dns_search_domain_ref(c->search_domain);
r = dns_query_synthesize_reply(q, &state);
if (r < 0)
goto fail;
dns_query_complete(q, state);
return;
fail:
q->answer_errno = -r;
dns_query_complete(q, DNS_TRANSACTION_ERRNO);
}
void dns_query_ready(DnsQuery *q) {
DnsQueryCandidate *bad = NULL, *c;
bool pending = false;
assert(q);
assert(DNS_TRANSACTION_IS_LIVE(q->state));
/* Note that this call might invalidate the query. Callers
* should hence not attempt to access the query or transaction
* after calling this function, unless the block_ready
* counter was explicitly bumped before doing so. */
if (q->block_ready > 0)
return;
LIST_FOREACH(candidates_by_query, c, q->candidates) {
DnsTransactionState state;
state = dns_query_candidate_state(c);
switch (state) {
case DNS_TRANSACTION_SUCCESS:
/* One of the candidates is successful,
* let's use it, and copy its data out */
dns_query_accept(q, c);
return;
case DNS_TRANSACTION_NULL:
case DNS_TRANSACTION_PENDING:
case DNS_TRANSACTION_VALIDATING:
/* One of the candidates is still going on,
* let's maybe wait for it */
pending = true;
break;
default:
/* Any kind of failure */
bad = c;
break;
}
}
if (pending)
return;
dns_query_accept(q, bad);
}
static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) {
_cleanup_(dns_question_unrefp) DnsQuestion *nq_idna = NULL, *nq_utf8 = NULL;
int r, k;
assert(q);
q->n_cname_redirects ++;
if (q->n_cname_redirects > CNAME_MAX)
return -ELOOP;
r = dns_question_cname_redirect(q->question_idna, cname, &nq_idna);
if (r < 0)
return r;
else if (r > 0)
log_debug("Following CNAME/DNAME %s → %s.", dns_question_first_name(q->question_idna), dns_question_first_name(nq_idna));
k = dns_question_is_equal(q->question_idna, q->question_utf8);
if (k < 0)
return r;
if (k > 0) {
/* Same question? Shortcut new question generation */
nq_utf8 = dns_question_ref(nq_idna);
k = r;
} else {
k = dns_question_cname_redirect(q->question_utf8, cname, &nq_utf8);
if (k < 0)
return k;
else if (k > 0)
log_debug("Following UTF8 CNAME/DNAME %s → %s.", dns_question_first_name(q->question_utf8), dns_question_first_name(nq_utf8));
}
if (r == 0 && k == 0) /* No actual cname happened? */
return -ELOOP;
dns_question_unref(q->question_idna);
q->question_idna = nq_idna;
nq_idna = NULL;
dns_question_unref(q->question_utf8);
q->question_utf8 = nq_utf8;
nq_utf8 = NULL;
dns_query_free_candidates(q);
dns_query_reset_answer(q);
q->state = DNS_TRANSACTION_NULL;
/* Turn off searching for the new name */
q->flags |= SD_RESOLVED_NO_SEARCH;
return 0;
}
int dns_query_process_cname(DnsQuery *q) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *cname = NULL;
DnsQuestion *question;
DnsResourceRecord *rr;
int r;
assert(q);
if (!IN_SET(q->state, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NULL))
return DNS_QUERY_NOMATCH;
question = dns_query_question_for_protocol(q, q->answer_protocol);
DNS_ANSWER_FOREACH(rr, q->answer) {
r = dns_question_matches_rr(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
if (r < 0)
return r;
if (r > 0)
return DNS_QUERY_MATCH; /* The answer matches directly, no need to follow cnames */
r = dns_question_matches_cname_or_dname(question, rr, DNS_SEARCH_DOMAIN_NAME(q->answer_search_domain));
if (r < 0)
return r;
if (r > 0 && !cname)
cname = dns_resource_record_ref(rr);
}
if (!cname)
return DNS_QUERY_NOMATCH; /* No match and no cname to follow */
if (q->flags & SD_RESOLVED_NO_CNAME)
return -ELOOP;
/* OK, let's actually follow the CNAME */
r = dns_query_cname_redirect(q, cname);
if (r < 0)
return r;
/* Let's see if the answer can already answer the new
* redirected question */
r = dns_query_process_cname(q);
if (r != DNS_QUERY_NOMATCH)
return r;
/* OK, it cannot, let's begin with the new query */
r = dns_query_go(q);
if (r < 0)
return r;
return DNS_QUERY_RESTARTED; /* We restarted the query for a new cname */
}
static int on_bus_track(sd_bus_track *t, void *userdata) {
DnsQuery *q = userdata;
assert(t);
assert(q);
log_debug("Client of active query vanished, aborting query.");
dns_query_complete(q, DNS_TRANSACTION_ABORTED);
return 0;
}
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, 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;
}
DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol) {
assert(q);
switch (protocol) {
case DNS_PROTOCOL_DNS:
return q->question_idna;
case DNS_PROTOCOL_MDNS:
case DNS_PROTOCOL_LLMNR:
return q->question_utf8;
default:
return NULL;
}
}
const char *dns_query_string(DnsQuery *q) {
const char *name;
int r;
/* Returns a somewhat useful human-readable lookup key string for this query */
if (q->request_address_string)
return q->request_address_string;
if (q->request_address_valid) {
r = in_addr_to_string(q->request_family, &q->request_address, &q->request_address_string);
if (r >= 0)
return q->request_address_string;
}
name = dns_question_first_name(q->question_utf8);
if (name)
return name;
return dns_question_first_name(q->question_idna);
}
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