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Add separate prefetch nmhandle to ns_client_t

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As the query_prefetch() or query_rpzfetch() could be called during
"regular" fetch, we need to introduce separate storage for attaching
the nmhandle during prefetching the records.  The query_prefetch()
and query_rpzfetch() are guarded for re-entrance by .query.prefetch
member of ns_client_t, so we can reuse the same .prefetchhandle for
both.
This commit is contained in:
Ondřej Surý
2020-09-15 12:55:03 +02:00
parent e60370bacd
commit d4976e0ebe
2 changed files with 12 additions and 11 deletions
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13
lib/ns/include/ns/client.h
View File

@@ -183,12 +183,13 @@ struct ns_client {
isc_task_t * task;
dns_view_t * view;
dns_dispatch_t * dispatch;
isc_nmhandle_t * handle; /* Permanent pointer to handle */
isc_nmhandle_t * sendhandle; /* Waiting for send callback */
isc_nmhandle_t * reqhandle; /* Waiting for request callback
(query, update, notify) */
isc_nmhandle_t *fetchhandle; /* Waiting for recursive fetch */
isc_nmhandle_t *updatehandle; /* Waiting for update callback */
isc_nmhandle_t * handle; /* Permanent pointer to handle */
isc_nmhandle_t * sendhandle; /* Waiting for send callback */
isc_nmhandle_t * reqhandle; /* Waiting for request callback
(query, update, notify) */
isc_nmhandle_t *fetchhandle; /* Waiting for recursive fetch */
isc_nmhandle_t *prefetchhandle; /* Waiting for prefetch / rpzfetch */
isc_nmhandle_t *updatehandle; /* Waiting for update callback */
unsigned char * tcpbuf;
dns_message_t * message;
unsigned char * sendbuf;

10
lib/ns/query.c
View File

@@ -2475,7 +2475,7 @@ prefetch_done(isc_task_t *task, isc_event_t *event) {
}
free_devent(client, &event, &devent);
isc_nmhandle_detach(&client->fetchhandle);
isc_nmhandle_detach(&client->prefetchhandle);
}
static void
@@ -2518,7 +2518,7 @@ query_prefetch(ns_client_t *client, dns_name_t *qname,
peeraddr = NULL;
}
isc_nmhandle_attach(client->handle, &client->fetchhandle);
isc_nmhandle_attach(client->handle, &client->prefetchhandle);
options = client->query.fetchoptions | DNS_FETCHOPT_PREFETCH;
result = dns_resolver_createfetch(
client->view->resolver, qname, rdataset->type, NULL, NULL, NULL,
@@ -2527,7 +2527,7 @@ query_prefetch(ns_client_t *client, dns_name_t *qname,
&client->query.prefetch);
if (result != ISC_R_SUCCESS) {
ns_client_putrdataset(client, &tmprdataset);
isc_nmhandle_detach(&client->fetchhandle);
isc_nmhandle_detach(&client->prefetchhandle);
}
dns_rdataset_clearprefetch(rdataset);
@@ -2732,7 +2732,7 @@ query_rpzfetch(ns_client_t *client, dns_name_t *qname, dns_rdatatype_t type) {
}
options = client->query.fetchoptions;
isc_nmhandle_attach(client->handle, &client->fetchhandle);
isc_nmhandle_attach(client->handle, &client->prefetchhandle);
result = dns_resolver_createfetch(
client->view->resolver, qname, type, NULL, NULL, NULL, peeraddr,
client->message->id, options, 0, NULL, client->task,
@@ -2740,7 +2740,7 @@ query_rpzfetch(ns_client_t *client, dns_name_t *qname, dns_rdatatype_t type) {
&client->query.prefetch);
if (result != ISC_R_SUCCESS) {
ns_client_putrdataset(client, &tmprdataset);
isc_nmhandle_detach(&client->fetchhandle);
isc_nmhandle_detach(&client->prefetchhandle);
}
}