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Store CNAMEs and their SIGs (if any) in their own name structure on the

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name list.  I.e. do not mix CNAMEs with non-CNAME data.  Do the same thing
for DNAMEs.
This commit is contained in:
Bob Halley 1999-10-17 19:20:20 +00:00
parent 238c9f5aaa
commit 2f6040ed67
1 changed files with 61 additions and 37 deletions
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98
lib/dns/message.c
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@ -587,14 +587,16 @@ dns_message_destroy(dns_message_t **msgp)
}
static dns_result_t
findname(dns_name_t **foundname, dns_name_t *target, dns_namelist_t *section)
findname(dns_name_t **foundname, dns_name_t *target, unsigned int attributes,
dns_namelist_t *section)
{
dns_name_t *curr;
for (curr = ISC_LIST_TAIL(*section) ;
curr != NULL ;
curr = ISC_LIST_PREV(curr, link)) {
if (dns_name_equal(curr, target)) {
if (dns_name_equal(curr, target) &&
(curr->attributes & attributes) == attributes) {
if (foundname != NULL)
*foundname = curr;
return (DNS_R_SUCCESS);
@ -777,7 +779,7 @@ getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx)
* name since we no longer need it, and set our name pointer
* to point to the name we found.
*/
result = findname(&name2, name, section);
result = findname(&name2, name, 0, section);
/*
* If it is the first name in the section, accept it.
@ -890,8 +892,7 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
dns_section_t sectionid, isc_boolean_t preserve_order)
{
isc_region_t r;
unsigned int count;
unsigned int rdatalen;
unsigned int count, rdatalen, attributes;
dns_name_t *name;
dns_name_t *name2;
dns_rdataset_t *rdataset;
@ -905,10 +906,11 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
for (count = 0 ; count < msg->counts[sectionid] ; count++) {
int recstart = source->current;
isc_boolean_t skip_search;
isc_boolean_t skip_name_search, skip_type_search;
section = &msg->sections[sectionid];
skip_search = ISC_FALSE;
skip_name_search = ISC_FALSE;
skip_type_search = ISC_FALSE;
name = isc_mempool_get(msg->namepool);
if (name == NULL)
return (DNS_R_NOMEMORY);
@ -969,7 +971,8 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
return (DNS_R_FORMERR);
section = &msg->sections[DNS_SECTION_TSIG];
msg->tsigstart = recstart;
skip_search = ISC_TRUE;
skip_name_search = ISC_TRUE;
skip_type_search = ISC_TRUE;
} else if (rdtype == dns_rdatatype_opt) {
/*
* The name of an OPT record must be ".", it
@ -980,7 +983,8 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
sectionid != DNS_SECTION_ADDITIONAL ||
msg->opt != NULL)
return (DNS_R_FORMERR);
skip_search = ISC_TRUE;
skip_name_search = ISC_TRUE;
skip_type_search = ISC_TRUE;
}
/*
@ -992,12 +996,50 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
if (r.length < rdatalen)
return (DNS_R_UNEXPECTEDEND);
/*
* Read the rdata from the wire format. Interpret the
* rdata according to its actual class, even if it had a
* DynDNS meta-class in the packet (unless this is a TSIG).
* Then put the meta-class back into the finished rdata.
*/
rdata = newrdata(msg);
if (rdata == NULL)
return (DNS_R_NOMEMORY);
attributes = 0;
if (rdtype != dns_rdatatype_tsig) {
if (rdtype == dns_rdatatype_cname) {
name->attributes |= DNS_NAMEATTR_CNAME;
attributes = DNS_NAMEATTR_CNAME;
skip_name_search = ISC_TRUE;
} else if (rdtype == dns_rdatatype_dname) {
name->attributes |= DNS_NAMEATTR_DNAME;
attributes = DNS_NAMEATTR_DNAME;
skip_name_search = ISC_TRUE;
}
result = getrdata(name, source, msg, dctx,
msg->rdclass, rdtype,
rdatalen, rdata);
} else
result = getrdata(name, source, msg, dctx,
rdclass, rdtype, rdatalen, rdata);
if (result != DNS_R_SUCCESS)
return (result);
rdata->rdclass = rdclass;
if (rdtype == dns_rdatatype_sig && rdata->length > 0) {
covers = dns_rdata_covers(rdata);
if (covers == dns_rdatatype_cname)
attributes = DNS_NAMEATTR_CNAME;
else if (covers == dns_rdatatype_dname)
attributes = DNS_NAMEATTR_DNAME;
} else
covers = 0;
/*
* If we are doing a dynamic update don't bother searching
* for a name, just append this one to the end of the message.
*/
if (preserve_order || msg->opcode == dns_opcode_update ||
skip_search) {
skip_name_search) {
if (rdtype != dns_rdatatype_opt)
ISC_LIST_APPEND(*section, name, link);
} else {
@ -1007,7 +1049,7 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
* allocated name since we no longer need it, and set
* our name pointer to point to the name we found.
*/
result = findname(&name2, name, section);
result = findname(&name2, name, attributes, section);
/*
* If it is a new name, append to the section.
@ -1020,36 +1062,12 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
}
}
/*
* Read the rdata from the wire format. Interpret the
* rdata according to its actual class, even if it had a
* DynDNS meta-class in the packet (unless this is a TSIG).
* Then put the meta-class back into the finished rdata.
*/
rdata = newrdata(msg);
if (rdata == NULL)
return (DNS_R_NOMEMORY);
if (rdtype != dns_rdatatype_tsig)
result = getrdata(name, source, msg, dctx,
msg->rdclass, rdtype,
rdatalen, rdata);
else
result = getrdata(name, source, msg, dctx,
rdclass, rdtype, rdatalen, rdata);
if (result != DNS_R_SUCCESS)
return (result);
rdata->rdclass = rdclass;
if (rdtype == dns_rdatatype_sig && rdata->length > 0)
covers = dns_rdata_covers(rdata);
else
covers = 0;
/*
* Search name for the particular type and class.
* Skip this stage if in update mode, or this is a TSIG.
*/
if (preserve_order || msg->opcode == dns_opcode_update ||
skip_search)
skip_type_search)
result = DNS_R_NOTFOUND;
else {
rdataset = NULL;
@ -1063,6 +1081,9 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
* to create a new rdatalist, store the important bits there,
* convert it to an rdataset, and link the latter to the name.
* Yuck.
*
* XXXRTH Check for attempts to create multi-record RRsets
* for singleton RR types.
*/
if (result == DNS_R_NOTFOUND) {
rdataset = isc_mempool_get(msg->rdspool);
@ -1555,8 +1576,11 @@ dns_message_findname(dns_message_t *msg, dns_section_t section,
/*
* Search through, looking for the name.
*
* XXXRTH We should probably allow the 'attributes' parameter
* to be set in the public API.
*/
result = findname(&foundname, target, &msg->sections[section]);
result = findname(&foundname, target, 0, &msg->sections[section]);
if (result == DNS_R_NOTFOUND)
return (DNS_R_NXDOMAIN);
else if (result != DNS_R_SUCCESS)