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Diffstat (limited to 'src/resolve/resolved-dns-query.c')
-rw-r--r--src/resolve/resolved-dns-query.c389
1 files changed, 173 insertions, 216 deletions
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index ace768b824..80526bbc28 100644
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -31,26 +31,32 @@
static int dns_query_transaction_go(DnsQueryTransaction *t);
DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t) {
+ DnsQuery *q;
+
if (!t)
return NULL;
sd_event_source_unref(t->timeout_event_source);
+ dns_question_unref(t->question);
dns_packet_unref(t->sent);
dns_packet_unref(t->received);
-
- dns_resource_record_freev(t->cached_rrs, t->n_cached_rrs);
+ dns_answer_unref(t->cached);
sd_event_source_unref(t->tcp_event_source);
safe_close(t->tcp_fd);
- if (t->query) {
- LIST_REMOVE(transactions_by_query, t->query->transactions, t);
- hashmap_remove(t->query->manager->dns_query_transactions, UINT_TO_PTR(t->id));
+ if (t->scope) {
+ LIST_REMOVE(transactions_by_scope, t->scope->transactions, t);
+
+ if (t->id != 0)
+ hashmap_remove(t->scope->manager->dns_query_transactions, UINT_TO_PTR(t->id));
}
- if (t->scope)
- LIST_REMOVE(transactions_by_scope, t->scope->transactions, t);
+ while ((q = set_steal_first(t->queries)))
+ set_remove(q->transactions, t);
+
+ set_free(t->queries);
free(t);
return NULL;
@@ -58,14 +64,25 @@ DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t) {
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQueryTransaction*, dns_query_transaction_free);
-static int dns_query_transaction_new(DnsQuery *q, DnsQueryTransaction **ret, DnsScope *s) {
+static void dns_query_transaction_gc(DnsQueryTransaction *t) {
+ assert(t);
+
+ if (t->block_gc > 0)
+ return;
+
+ if (set_isempty(t->queries))
+ dns_query_transaction_free(t);
+}
+
+static int dns_query_transaction_new(DnsQueryTransaction **ret, DnsScope *s, DnsQuestion *q) {
_cleanup_(dns_query_transaction_freep) DnsQueryTransaction *t = NULL;
int r;
- assert(q);
+ assert(ret);
assert(s);
+ assert(q);
- r = hashmap_ensure_allocated(&q->manager->dns_query_transactions, NULL, NULL);
+ r = hashmap_ensure_allocated(&s->manager->dns_query_transactions, NULL, NULL);
if (r < 0)
return r;
@@ -74,21 +91,19 @@ static int dns_query_transaction_new(DnsQuery *q, DnsQueryTransaction **ret, Dns
return -ENOMEM;
t->tcp_fd = -1;
+ t->question = dns_question_ref(q);
do
random_bytes(&t->id, sizeof(t->id));
while (t->id == 0 ||
- hashmap_get(q->manager->dns_query_transactions, UINT_TO_PTR(t->id)));
+ hashmap_get(s->manager->dns_query_transactions, UINT_TO_PTR(t->id)));
- r = hashmap_put(q->manager->dns_query_transactions, UINT_TO_PTR(t->id), t);
+ r = hashmap_put(s->manager->dns_query_transactions, UINT_TO_PTR(t->id), t);
if (r < 0) {
t->id = 0;
return r;
}
- LIST_PREPEND(transactions_by_query, q->transactions, t);
- t->query = q;
-
LIST_PREPEND(transactions_by_scope, s->transactions, t);
t->scope = s;
@@ -108,7 +123,10 @@ static void dns_query_transaction_stop(DnsQueryTransaction *t) {
t->tcp_fd = safe_close(t->tcp_fd);
}
-static void dns_query_transaction_complete(DnsQueryTransaction *t, DnsQueryState state) {
+void dns_query_transaction_complete(DnsQueryTransaction *t, DnsQueryState state) {
+ DnsQuery *q;
+ Iterator i;
+
assert(t);
assert(!IN_SET(state, DNS_QUERY_NULL, DNS_QUERY_PENDING));
assert(IN_SET(t->state, DNS_QUERY_NULL, DNS_QUERY_PENDING));
@@ -120,7 +138,15 @@ static void dns_query_transaction_complete(DnsQueryTransaction *t, DnsQueryState
t->state = state;
dns_query_transaction_stop(t);
- dns_query_finish(t->query);
+
+ /* Notify all queries that are interested, but make sure the
+ * transaction isn't freed while we are still looking at it */
+ t->block_gc++;
+ SET_FOREACH(q, t->queries, i)
+ dns_query_ready(q);
+ t->block_gc--;
+
+ dns_query_transaction_gc(t);
}
static int on_tcp_ready(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
@@ -215,7 +241,7 @@ static int on_tcp_ready(sd_event_source *s, int fd, uint32_t revents, void *user
if (t->tcp_read >= sizeof(t->tcp_read_size) + be16toh(t->tcp_read_size)) {
t->received->size = be16toh(t->tcp_read_size);
- dns_query_transaction_reply(t, t->received);
+ dns_query_transaction_process_reply(t, t->received);
return 0;
}
}
@@ -243,7 +269,7 @@ static int dns_query_transaction_open_tcp(DnsQueryTransaction *t) {
if (t->tcp_fd < 0)
return t->tcp_fd;
- r = sd_event_add_io(t->query->manager->event, &t->tcp_event_source, t->tcp_fd, EPOLLIN|EPOLLOUT, on_tcp_ready, t);
+ r = sd_event_add_io(t->scope->manager->event, &t->tcp_event_source, t->tcp_fd, EPOLLIN|EPOLLOUT, on_tcp_ready, t);
if (r < 0) {
t->tcp_fd = safe_close(t->tcp_fd);
return r;
@@ -252,7 +278,7 @@ static int dns_query_transaction_open_tcp(DnsQueryTransaction *t) {
return 0;
}
-void dns_query_transaction_reply(DnsQueryTransaction *t, DnsPacket *p) {
+void dns_query_transaction_process_reply(DnsQueryTransaction *t, DnsPacket *p) {
int r;
assert(t);
@@ -305,12 +331,12 @@ void dns_query_transaction_reply(DnsQueryTransaction *t, DnsPacket *p) {
}
/* Parse and update the cache */
- r = dns_packet_extract_rrs(p);
+ r = dns_packet_extract(p);
if (r < 0) {
dns_query_transaction_complete(t, DNS_QUERY_INVALID_REPLY);
return;
} else if (r > 0)
- dns_cache_put_rrs(&t->scope->cache, p->rrs, r, 0);
+ dns_cache_put_answer(&t->scope->cache, p->answer, 0);
if (DNS_PACKET_RCODE(p) == DNS_RCODE_SUCCESS)
dns_query_transaction_complete(t, DNS_QUERY_SUCCESS);
@@ -349,14 +375,14 @@ static int dns_query_make_packet(DnsQueryTransaction *t) {
if (r < 0)
return r;
- for (n = 0; n < t->query->n_keys; n++) {
- r = dns_scope_good_key(t->scope, &t->query->keys[n]);
+ for (n = 0; n < t->question->n_keys; n++) {
+ r = dns_scope_good_key(t->scope, t->question->keys[n]);
if (r < 0)
return r;
if (r == 0)
continue;
- r = dns_packet_append_key(p, &t->query->keys[n], NULL);
+ r = dns_packet_append_key(p, t->question->keys[n], NULL);
if (r < 0)
return r;
@@ -389,16 +415,14 @@ static int dns_query_transaction_go(DnsQueryTransaction *t) {
t->n_attempts++;
t->received = dns_packet_unref(t->received);
- t->cached_rrs = dns_resource_record_freev(t->cached_rrs, t->n_cached_rrs);
- t->n_cached_rrs = 0;
+ t->cached = dns_answer_unref(t->cached);
/* First, let's try the cache */
dns_cache_prune(&t->scope->cache);
- r = dns_cache_lookup_many(&t->scope->cache, t->query->keys, t->query->n_keys, &t->cached_rrs);
+ r = dns_cache_lookup(&t->scope->cache, t->question, &t->cached);
if (r < 0)
return r;
if (r > 0) {
- t->n_cached_rrs = r;
dns_query_transaction_complete(t, DNS_QUERY_SUCCESS);
return 0;
}
@@ -431,7 +455,7 @@ static int dns_query_transaction_go(DnsQueryTransaction *t) {
return dns_query_transaction_go(t);
}
- r = sd_event_add_time(t->query->manager->event, &t->timeout_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + TRANSACTION_TIMEOUT_USEC, 0, on_transaction_timeout, t);
+ r = sd_event_add_time(t->scope->manager->event, &t->timeout_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + TRANSACTION_TIMEOUT_USEC, 0, on_transaction_timeout, t);
if (r < 0)
return r;
@@ -440,72 +464,61 @@ static int dns_query_transaction_go(DnsQueryTransaction *t) {
}
DnsQuery *dns_query_free(DnsQuery *q) {
- unsigned n;
+ DnsQueryTransaction *t;
if (!q)
return NULL;
sd_bus_message_unref(q->request);
- dns_packet_unref(q->received);
- dns_resource_record_freev(q->cached_rrs, q->n_cached_rrs);
+ dns_question_unref(q->question);
+ dns_answer_unref(q->answer);
sd_event_source_unref(q->timeout_event_source);
- while (q->transactions)
- dns_query_transaction_free(q->transactions);
+ while ((t = set_steal_first(q->transactions))) {
+ set_remove(t->queries, q);
+ dns_query_transaction_gc(t);
+ }
+
+ set_free(q->transactions);
if (q->manager) {
LIST_REMOVE(queries, q->manager->dns_queries, q);
q->manager->n_dns_queries--;
}
- for (n = 0; n < q->n_keys; n++)
- free(q->keys[n].name);
- free(q->keys);
free(q);
return NULL;
}
-int dns_query_new(Manager *m, DnsQuery **ret, DnsResourceKey *keys, unsigned n_keys) {
+int dns_query_new(Manager *m, DnsQuery **ret, DnsQuestion *question) {
_cleanup_(dns_query_freep) DnsQuery *q = NULL;
- const char *name = NULL;
+ unsigned i;
+ int r;
assert(m);
+ assert(question);
- if (n_keys <= 0 || n_keys >= 65535)
- return -EINVAL;
+ r = dns_question_is_valid(question);
+ if (r < 0)
+ return r;
if (m->n_dns_queries >= QUERIES_MAX)
return -EBUSY;
- assert(keys);
-
q = new0(DnsQuery, 1);
if (!q)
return -ENOMEM;
- q->keys = new(DnsResourceKey, n_keys);
- if (!q->keys)
- return -ENOMEM;
-
- for (q->n_keys = 0; q->n_keys < n_keys; q->n_keys++) {
- q->keys[q->n_keys].class = keys[q->n_keys].class;
- q->keys[q->n_keys].type = keys[q->n_keys].type;
- q->keys[q->n_keys].name = strdup(keys[q->n_keys].name);
- if (!q->keys[q->n_keys].name)
- return -ENOMEM;
-
- if (!name)
- name = q->keys[q->n_keys].name;
- else if (!dns_name_equal(name, q->keys[q->n_keys].name))
- return -EINVAL;
+ q->question = dns_question_ref(question);
+ for (i = 0; i < question->n_keys; i++) {
log_debug("Looking up RR for %s %s %s",
- strna(dns_class_to_string(keys[q->n_keys].class)),
- strna(dns_type_to_string(keys[q->n_keys].type)),
- keys[q->n_keys].name);
+ strna(dns_class_to_string(question->keys[i]->class)),
+ strna(dns_type_to_string(question->keys[i]->type)),
+ DNS_RESOURCE_KEY_NAME(question->keys[i]));
}
LIST_PREPEND(queries, m->dns_queries, q);
@@ -520,12 +533,16 @@ int dns_query_new(Manager *m, DnsQuery **ret, DnsResourceKey *keys, unsigned n_k
}
static void dns_query_stop(DnsQuery *q) {
+ DnsQueryTransaction *t;
+
assert(q);
q->timeout_event_source = sd_event_source_unref(q->timeout_event_source);
- while (q->transactions)
- dns_query_transaction_free(q->transactions);
+ while ((t = set_steal_first(q->transactions))) {
+ set_remove(t->queries, q);
+ dns_query_transaction_gc(t);
+ }
}
static void dns_query_complete(DnsQuery *q, DnsQueryState state) {
@@ -554,10 +571,53 @@ static int on_query_timeout(sd_event_source *s, usec_t usec, void *userdata) {
return 0;
}
+static int dns_query_add_transaction(DnsQuery *q, DnsScope *s) {
+ DnsQueryTransaction *t;
+ int r;
+
+ assert(q);
+
+ r = set_ensure_allocated(&q->transactions, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ LIST_FOREACH(transactions_by_scope, t, s->transactions)
+ if (dns_question_is_superset(t->question, q->question))
+ break;
+
+ if (!t) {
+ r = dns_query_transaction_new(&t, s, q->question);
+ if (r < 0)
+ return r;
+ }
+
+ r = set_ensure_allocated(&t->queries, NULL, NULL);
+ if (r < 0)
+ goto fail;
+
+ r = set_put(t->queries, q);
+ if (r < 0)
+ goto fail;
+
+ r = set_put(q->transactions, t);
+ if (r < 0) {
+ set_remove(t->queries, q);
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ dns_query_transaction_gc(t);
+ return r;
+}
+
int dns_query_go(DnsQuery *q) {
DnsScopeMatch found = DNS_SCOPE_NO;
DnsScope *s, *first = NULL;
DnsQueryTransaction *t;
+ const char *name;
+ Iterator i;
int r;
assert(q);
@@ -565,12 +625,15 @@ int dns_query_go(DnsQuery *q) {
if (q->state != DNS_QUERY_NULL)
return 0;
- assert(q->n_keys > 0);
+ assert(q->question);
+ assert(q->question->n_keys > 0);
+
+ name = DNS_RESOURCE_KEY_NAME(q->question->keys[0]);
LIST_FOREACH(scopes, s, q->manager->dns_scopes) {
DnsScopeMatch match;
- match = dns_scope_good_domain(s, q->keys[0].name);
+ match = dns_scope_good_domain(s, name);
if (match < 0)
return match;
@@ -593,42 +656,46 @@ int dns_query_go(DnsQuery *q) {
if (found == DNS_SCOPE_NO)
return -ESRCH;
- r = dns_query_transaction_new(q, NULL, first);
+ r = dns_query_add_transaction(q, first);
if (r < 0)
return r;
LIST_FOREACH(scopes, s, first->scopes_next) {
DnsScopeMatch match;
- match = dns_scope_good_domain(s, q->keys[0].name);
+ match = dns_scope_good_domain(s, name);
if (match < 0)
return match;
if (match != found)
continue;
- r = dns_query_transaction_new(q, NULL, s);
+ r = dns_query_add_transaction(q, s);
if (r < 0)
return r;
}
- q->received = dns_packet_unref(q->received);
+ q->answer = dns_answer_unref(q->answer);
+ q->answer_ifindex = 0;
+ q->answer_rcode = 0;
r = sd_event_add_time(q->manager->event, &q->timeout_event_source, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + QUERY_TIMEOUT_USEC, 0, on_query_timeout, q);
if (r < 0)
goto fail;
q->state = DNS_QUERY_PENDING;
- q->block_finish++;
+ q->block_ready++;
- LIST_FOREACH(transactions_by_query, t, q->transactions) {
- r = dns_query_transaction_go(t);
- if (r < 0)
- goto fail;
+ SET_FOREACH(t, q->transactions, i) {
+ if (t->state == DNS_QUERY_NULL) {
+ r = dns_query_transaction_go(t);
+ if (r < 0)
+ goto fail;
+ }
}
- q->block_finish--;
- dns_query_finish(q);
+ q->block_ready--;
+ dns_query_ready(q);
return 1;
@@ -637,23 +704,24 @@ fail:
return r;
}
-void dns_query_finish(DnsQuery *q) {
+void dns_query_ready(DnsQuery *q) {
DnsQueryTransaction *t;
DnsQueryState state = DNS_QUERY_NO_SERVERS;
DnsPacket *received = NULL;
+ Iterator i;
assert(q);
assert(IN_SET(q->state, DNS_QUERY_NULL, DNS_QUERY_PENDING));
/* 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_finish
+ * after calling this function, unless the block_ready
* counter was explicitly bumped before doing so. */
- if (q->block_finish > 0)
+ if (q->block_ready > 0)
return;
- LIST_FOREACH(transactions_by_query, t, q->transactions) {
+ SET_FOREACH(t, q->transactions, i) {
/* One of the transactions is still going on, let's wait for it */
if (t->state == DNS_QUERY_PENDING || t->state == DNS_QUERY_NULL)
@@ -662,13 +730,15 @@ void dns_query_finish(DnsQuery *q) {
/* One of the transactions is successful, let's use
* it, and copy its data out */
if (t->state == DNS_QUERY_SUCCESS) {
- q->received = dns_packet_ref(t->received);
-
- /* We simply steal the cached RRs array */
- q->cached_rrs = t->cached_rrs;
- q->n_cached_rrs = t->n_cached_rrs;
- t->cached_rrs = NULL;
- t->n_cached_rrs = 0;
+ if (t->received) {
+ q->answer = dns_answer_ref(t->received->answer);
+ q->answer_ifindex = t->received->ifindex;
+ q->answer_rcode = DNS_PACKET_RCODE(t->received);
+ } else {
+ q->answer = dns_answer_ref(t->cached);
+ q->answer_ifindex = t->scope->link ? t->scope->link->ifindex : 0;
+ q->answer_rcode = 0;
+ }
dns_query_complete(q, DNS_QUERY_SUCCESS);
return;
@@ -687,149 +757,36 @@ void dns_query_finish(DnsQuery *q) {
state = t->state;
}
- if (state == DNS_QUERY_FAILURE)
- q->received = dns_packet_ref(received);
+ if (state == DNS_QUERY_FAILURE) {
+ q->answer = dns_answer_ref(received->answer);
+ q->answer_ifindex = received->ifindex;
+ q->answer_rcode = DNS_PACKET_RCODE(received);
+ }
dns_query_complete(q, state);
}
int dns_query_cname_redirect(DnsQuery *q, const char *name) {
- DnsResourceKey *keys;
- unsigned i;
+ _cleanup_(dns_question_unrefp) DnsQuestion *nq = NULL;
+ int r;
assert(q);
- if (q->n_cname > CNAME_MAX)
+ if (q->n_cname_redirects > CNAME_MAX)
return -ELOOP;
- keys = new(DnsResourceKey, q->n_keys);
- if (!keys)
- return -ENOMEM;
-
- for (i = 0; i < q->n_keys; i++) {
- keys[i].class = q->keys[i].class;
- keys[i].type = q->keys[i].type;
- keys[i].name = strdup(name);
- if (!keys[i].name) {
-
- for (; i > 0; i--)
- free(keys[i-1].name);
- free(keys);
- return -ENOMEM;
- }
- }
-
- for (i = 0; i < q->n_keys; i++)
- free(q->keys[i].name);
- free(q->keys);
+ r = dns_question_cname_redirect(q->question, name, &nq);
+ if (r < 0)
+ return r;
- q->keys = keys;
+ dns_question_unref(q->question);
+ q->question = nq;
+ nq = NULL;
- q->n_cname++;
+ q->n_cname_redirects++;
dns_query_stop(q);
q->state = DNS_QUERY_NULL;
return 0;
}
-
-int dns_query_matches_rr(DnsQuery *q, DnsResourceRecord *rr) {
- unsigned i;
- int r;
-
- assert(q);
- assert(rr);
-
- for (i = 0; i < q->n_keys; i++) {
-
- if (rr->key.class != q->keys[i].class)
- continue;
-
- if (rr->key.type != q->keys[i].type &&
- q->keys[i].type != DNS_TYPE_ANY)
- continue;
-
- r = dns_name_equal(rr->key.name, q->keys[i].name);
- if (r != 0)
- return r;
- }
-
- return 0;
-}
-
-int dns_query_matches_cname(DnsQuery *q, DnsResourceRecord *rr) {
- unsigned i;
- int r;
-
- assert(q);
- assert(rr);
-
- for (i = 0; i < q->n_keys; i++) {
-
- if (rr->key.class != q->keys[i].class)
- continue;
-
- if (rr->key.type != DNS_TYPE_CNAME)
- continue;
-
- r = dns_name_equal(rr->key.name, q->keys[i].name);
- if (r != 0)
- return r;
- }
-
- return 0;
-}
-
-int dns_query_get_rrs(DnsQuery *q, DnsResourceRecord ***rrs) {
- int r;
-
- assert(q);
- assert(rrs);
-
- if (IN_SET(q->state, DNS_QUERY_NULL, DNS_QUERY_PENDING))
- return -EBUSY;
-
- if (q->received) {
- r = dns_packet_extract_rrs(q->received);
- if (r < 0)
- return r;
- if (r == 0) {
- *rrs = NULL;
- return r;
- }
-
- *rrs = q->received->rrs;
- return r;
- }
-
- if (q->cached_rrs) {
- *rrs = q->cached_rrs;
- return q->n_cached_rrs;
- }
-
- return -ESRCH;
-}
-
-int dns_query_get_rcode(DnsQuery *q) {
- assert(q);
-
- if (IN_SET(q->state, DNS_QUERY_NULL, DNS_QUERY_PENDING))
- return -EBUSY;
-
- if (!q->received)
- return -ESRCH;
-
- return DNS_PACKET_RCODE(q->received);
-}
-
-int dns_query_get_ifindex(DnsQuery *q) {
- assert(q);
-
- if (IN_SET(q->state, DNS_QUERY_NULL, DNS_QUERY_PENDING))
- return -EBUSY;
-
- if (!q->received)
- return -ESRCH;
-
- return q->received->ifindex;
-}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-23 18:24:25 +0000