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Synthesize an appropriate CNAME when following DNAME.

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This commit is contained in:
Bob Halley 1999-10-20 23:22:04 +00:00
parent ae51af4776
commit 9ab8a7477d
1 changed files with 71 additions and 2 deletions
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73
bin/named/query.c
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@ -35,6 +35,7 @@
#include <dns/message.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/resolver.h>
@ -1234,6 +1235,63 @@ query_addns(ns_client_t *client, dns_db_t *db) {
return (eresult);
}
static inline isc_result_t
query_addcname(ns_client_t *client, dns_name_t *qname, dns_name_t *tname,
dns_ttl_t ttl, dns_name_t **anamep)
{
dns_rdataset_t *rdataset;
dns_rdatalist_t *rdatalist;
dns_rdata_t *rdata;
isc_result_t result;
isc_region_t r;
/*
* We assume the name data referred to by qname and tname won't
* go away.
*/
REQUIRE(anamep != NULL);
rdatalist = NULL;
result = dns_message_gettemprdatalist(client->message, &rdatalist);
if (result != ISC_R_SUCCESS)
return (result);
rdata = NULL;
result = dns_message_gettemprdata(client->message, &rdata);
if (result != ISC_R_SUCCESS)
return (result);
rdataset = NULL;
result = dns_message_gettemprdataset(client->message, &rdataset);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_init(rdataset);
dns_name_clone(qname, *anamep);
rdatalist->type = dns_rdatatype_cname;
rdatalist->covers = 0;
rdatalist->rdclass = client->message->rdclass;
rdatalist->ttl = ttl;
dns_name_toregion(tname, &r);
rdata->data = r.base;
rdata->length = r.length;
ISC_LIST_INIT(rdatalist->rdata);
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
dns_rdatalist_tordataset(rdatalist, rdataset);
query_addrrset(client, anamep, &rdataset, NULL, NULL,
DNS_SECTION_ANSWER);
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, &rdataset);
}
return (ISC_R_SUCCESS);
}
static inline isc_result_t
query_checktype(dns_rdatatype_t type) {
@ -1902,7 +1960,7 @@ query_find(ns_client_t *client, dns_fetchevent_t *event) {
dns_name_init(tname, NULL);
dns_name_fromregion(tname, &r);
/*
* Construct the new qname and restart the query.
* Construct the new qname.
*/
dns_fixedname_init(&fixed);
prefix = dns_fixedname_name(&fixed);
@ -1919,8 +1977,8 @@ query_find(ns_client_t *client, dns_fetchevent_t *event) {
if (fname == NULL)
goto cleanup;
result = dns_name_concatenate(prefix, tname, fname, NULL);
dns_message_puttempname(client->message, &tname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
if (result == ISC_R_NOSPACE) {
/*
* RFC 2672, section 4.1, subsection 3c says
@ -1932,6 +1990,17 @@ query_find(ns_client_t *client, dns_fetchevent_t *event) {
goto cleanup;
}
query_keepname(client, fname, dbuf);
/*
* Synthesize a CNAME for this DNAME.
*/
dns_name_init(tname, NULL);
query_addcname(client, client->query.qname, fname,
trdataset->ttl, &tname);
if (tname != NULL)
dns_message_puttempname(client->message, &tname);
/*
* Switch to the new qname and restart.
*/
query_maybeputqname(client);
client->query.qname = fname;
fname = NULL;