static void
attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) {
sampledb_t *sampledb = (sampledb_t *) db;
REQUIRE(VALID_SAMPLEDB(sampledb));
dns_db_attachnode(sampledb->rbtdb, source, targetp);
}
static void
attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp)
{
ldapdb_t *ldapdb = (ldapdb_t *) db;
REQUIRE(VALID_LDAPDB(ldapdb));
dns_db_attachnode(ldapdb->rbtdb, source, targetp);
}
static void
lookup_find(dns_lookup_t *lookup, dns_fetchevent_t *event) {
isc_result_t result;
isc_boolean_t want_restart;
isc_boolean_t send_event;
dns_name_t *name, *fname, *prefix;
dns_fixedname_t foundname, fixed;
dns_rdata_t rdata = DNS_RDATA_INIT;
unsigned int nlabels;
int order;
dns_namereln_t namereln;
dns_rdata_cname_t cname;
dns_rdata_dname_t dname;
REQUIRE(VALID_LOOKUP(lookup));
LOCK(&lookup->lock);
result = ISC_R_SUCCESS;
name = dns_fixedname_name(&lookup->name);
do {
lookup->restarts++;
want_restart = ISC_FALSE;
send_event = ISC_TRUE;
if (event == NULL && !lookup->canceled) {
dns_fixedname_init(&foundname);
fname = dns_fixedname_name(&foundname);
INSIST(!dns_rdataset_isassociated(&lookup->rdataset));
INSIST(!dns_rdataset_isassociated
(&lookup->sigrdataset));
/*
* If we have restarted then clear the old node. */
if (lookup->event->node != NULL) {
INSIST(lookup->event->db != NULL);
dns_db_detachnode(lookup->event->db,
&lookup->event->node);
}
if (lookup->event->db != NULL)
dns_db_detach(&lookup->event->db);
result = view_find(lookup, fname);
if (result == ISC_R_NOTFOUND) {
/*
* We don't know anything about the name.
* Launch a fetch.
*/
if (lookup->event->node != NULL) {
INSIST(lookup->event->db != NULL);
dns_db_detachnode(lookup->event->db,
&lookup->event->node);
}
if (lookup->event->db != NULL)
dns_db_detach(&lookup->event->db);
result = start_fetch(lookup);
if (result == ISC_R_SUCCESS)
send_event = ISC_FALSE;
goto done;
}
} else if (event != NULL) {
result = event->result;
fname = dns_fixedname_name(&event->foundname);
dns_resolver_destroyfetch(&lookup->fetch);
INSIST(event->rdataset == &lookup->rdataset);
INSIST(event->sigrdataset == &lookup->sigrdataset);
} else
fname = NULL; /* Silence compiler warning. */
/*
* If we've been canceled, forget about the result.
*/
if (lookup->canceled)
result = ISC_R_CANCELED;
switch (result) {
case ISC_R_SUCCESS:
result = build_event(lookup);
if (event == NULL)
break;
if (event->db != NULL)
dns_db_attach(event->db, &lookup->event->db);
if (event->node != NULL)
dns_db_attachnode(lookup->event->db,
event->node,
&lookup->event->node);
break;
case DNS_R_CNAME:
/*
* Copy the CNAME's target into the lookup's
* query name and start over.
*/
result = dns_rdataset_first(&lookup->rdataset);
if (result != ISC_R_SUCCESS)
break;
dns_rdataset_current(&lookup->rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS)
break;
result = dns_name_copy(&cname.cname, name, NULL);
dns_rdata_freestruct(&cname);
if (result == ISC_R_SUCCESS) {
want_restart = ISC_TRUE;
send_event = ISC_FALSE;
}
break;
case DNS_R_DNAME:
namereln = dns_name_fullcompare(name, fname, &order,
&nlabels);
INSIST(namereln == dns_namereln_subdomain);
/*
* Get the target name of the DNAME.
*/
result = dns_rdataset_first(&lookup->rdataset);
if (result != ISC_R_SUCCESS)
break;
dns_rdataset_current(&lookup->rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &dname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS)
break;
/*
* Construct the new query name and start over.
*/
dns_fixedname_init(&fixed);
prefix = dns_fixedname_name(&fixed);
dns_name_split(name, nlabels, prefix, NULL);
result = dns_name_concatenate(prefix, &dname.dname,
name, NULL);
dns_rdata_freestruct(&dname);
if (result == ISC_R_SUCCESS) {
want_restart = ISC_TRUE;
send_event = ISC_FALSE;
}
break;
default:
send_event = ISC_TRUE;
}
if (dns_rdataset_isassociated(&lookup->rdataset))
dns_rdataset_disassociate(&lookup->rdataset);
if (dns_rdataset_isassociated(&lookup->sigrdataset))
dns_rdataset_disassociate(&lookup->sigrdataset);
done:
if (event != NULL) {
if (event->node != NULL)
dns_db_detachnode(event->db, &event->node);
if (event->db != NULL)
dns_db_detach(&event->db);
isc_event_free(ISC_EVENT_PTR(&event));
}
/*
* Limit the number of restarts.
*/
if (want_restart && lookup->restarts == MAX_RESTARTS) {
want_restart = ISC_FALSE;
result = ISC_R_QUOTA;
send_event = ISC_TRUE;
}
} while (want_restart);
if (send_event) {
lookup->event->result = result;
lookup->event->ev_sender = lookup;
isc_task_sendanddetach(&lookup->task,
(isc_event_t **)(void *)&lookup->event);
dns_view_detach(&lookup->view);
}
UNLOCK(&lookup->lock);
}
