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CNAME support in positive answers.

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This commit is contained in:
Bob Halley 1999-10-17 19:21:43 +00:00
parent c144a41078
commit fcddaadc8e
1 changed files with 67 additions and 17 deletions
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84
lib/dns/resolver.c
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@ -1023,6 +1023,7 @@ clone_results(fetchctx_t *fctx) {
#define ANSWER(r) (((r)->attributes & DNS_RDATASETATTR_ANSWER) != 0)
#define ANSWERSIG(r) (((r)->attributes & DNS_RDATASETATTR_ANSWERSIG) != 0)
#define EXTERNAL(r) (((r)->attributes & DNS_RDATASETATTR_EXTERNAL) != 0)
#define CHAINING(r) (((r)->attributes & DNS_RDATASETATTR_CHAINING) != 0)
static inline isc_result_t
cache_name(fetchctx_t *fctx, dns_name_t *name, isc_stdtime_t now) {
@ -1118,6 +1119,15 @@ cache_name(fetchctx_t *fctx, dns_name_t *name, isc_stdtime_t now) {
addedrdataset = ardataset;
else
addedrdataset = NULL;
if (CHAINING(rdataset)) {
if (rdataset->type == dns_rdatatype_cname)
eresult = DNS_R_CNAME;
else {
INSIST(rdataset->type ==
dns_rdatatype_dname);
eresult = DNS_R_DNAME;
}
}
result = dns_db_addrdataset(res->view->cachedb,
node, NULL, now,
rdataset,
@ -1135,6 +1145,7 @@ cache_name(fetchctx_t *fctx, dns_name_t *name, isc_stdtime_t now) {
*/
INSIST(0);
}
result = ISC_R_SUCCESS;
} else if (result != ISC_R_SUCCESS)
break;
}
@ -1362,14 +1373,31 @@ check_related(void *arg, dns_name_t *addname, dns_rdatatype_t type) {
return (ISC_R_SUCCESS);
}
static inline isc_result_t
cname_target(dns_rdataset_t *rdataset, dns_name_t *tname) {
isc_result_t result;
dns_rdata_t rdata;
isc_region_t r;
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_current(rdataset, &rdata);
dns_rdata_toregion(&rdata, &r);
dns_name_fromregion(tname, &r);
return (ISC_R_SUCCESS);
}
static inline isc_result_t
answer_response(fetchctx_t *fctx) {
isc_result_t result;
dns_message_t *message;
dns_name_t *name, *qname;
dns_name_t *name, *qname, tname;
dns_rdataset_t *rdataset;
isc_boolean_t done, external, chaining, aa, found;
isc_boolean_t done, external, chaining, aa, found, cname;
unsigned int aflag;
dns_rdatatype_t type;
message = fctx->rmessage;
@ -1385,30 +1413,21 @@ answer_response(fetchctx_t *fctx) {
else
aa = ISC_FALSE;
qname = &fctx->name;
type = fctx->type;
result = dns_message_firstname(message, DNS_SECTION_ANSWER);
while (!done && result == ISC_R_SUCCESS) {
name = NULL;
dns_message_currentname(message, DNS_SECTION_ANSWER, &name);
external = !dns_name_issubdomain(name, &fctx->domain);
if (dns_name_equal(name, qname)) {
/*
* XXXRTH CNAME check.
*/
#if 0
if (cname) {
qname = name;
chaining = ISC_TRUE;
}
#endif
aflag = 0;
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
found = ISC_FALSE;
if (rdataset->type == fctx->type ||
fctx->type == dns_rdatatype_any) {
cname = ISC_FALSE;
aflag = 0;
if (rdataset->type == type ||
type == dns_rdatatype_any) {
/*
* We've found an ordinary answer.
*/
@ -1416,13 +1435,34 @@ answer_response(fetchctx_t *fctx) {
done = ISC_TRUE;
aflag = DNS_RDATASETATTR_ANSWER;
} else if (rdataset->type == dns_rdatatype_sig
&& rdataset->covers == fctx->type) {
&& rdataset->covers == type) {
/*
* We've found a signature that
* covers the type we're looking for.
*/
found = ISC_TRUE;
aflag = DNS_RDATASETATTR_ANSWERSIG;
} else if (rdataset->type ==
dns_rdatatype_cname) {
/*
* We're looking for something else,
* but we found a CNAME.
*
* Getting a CNAME response for some
* query types is an error.
*/
if (type == dns_rdatatype_sig ||
type == dns_rdatatype_key ||
type == dns_rdatatype_nxt)
return (DNS_R_FORMERR);
found = ISC_TRUE;
cname = ISC_TRUE;
aflag = DNS_RDATASETATTR_ANSWER;
dns_name_init(&tname, NULL);
result = cname_target(rdataset,
&tname);
if (result != ISC_R_SUCCESS)
return (result);
}
if (found) {
@ -1480,6 +1520,16 @@ answer_response(fetchctx_t *fctx) {
check_related(fctx, name,
dns_rdatatype_aaaa);
}
/*
* CNAME chaining.
*/
if (cname) {
chaining = ISC_TRUE;
rdataset->attributes |=
DNS_RDATASETATTR_CHAINING;
qname = &tname;
}
}
/*
* We could add an "else" clause here and