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Use a binary search to find the NSEC3 closest encloser

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maxlabels is the suffix length that corresponds to the latest
NXDOMAIN response.  minlabels is the suffix length that corresponds
to longest found existing name.

(cherry picked from commit 67f31c5046)
This commit is contained in:
Mark Andrews 2024-10-10 16:39:10 +11:00 committed by Matthijs Mekking
parent 2c7594709c
commit ae718fab53
1 changed files with 18 additions and 9 deletions
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27
lib/ns/query.c
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@ -11342,24 +11342,33 @@ again:
* No NSEC proof available, return NSEC3 proofs instead.
*/
cname = dns_fixedname_initname(&cfixed);
/*
* Find the closest encloser.
* Find the closest encloser using a binary search.
* maxlabels: suffix length of NXDOMAIN result
* minlabels: suffix length of non NXDOMAIN result
*/
unsigned int maxlabels = dns_name_countlabels(name);
unsigned int minlabels = dns_name_countlabels(fname);
bool search = result == DNS_R_NXDOMAIN;
dns_name_copy(name, cname);
while (result == DNS_R_NXDOMAIN) {
labels = dns_name_countlabels(cname) - 1;
/*
* Sanity check.
*/
if (labels == 0U) {
goto cleanup;
while (search) {
labels = (maxlabels + minlabels) / 2;
dns_name_split(name, labels, NULL, cname);
if (labels == minlabels) {
break;
}
dns_name_split(cname, labels, NULL, cname);
result = dns_db_findext(qctx->db, cname, qctx->version,
dns_rdatatype_nsec, options, 0,
NULL, fname, &cm, &ci, NULL,
NULL);
if (result == DNS_R_NXDOMAIN) {
maxlabels = labels;
} else {
minlabels = labels;
}
}
/*
* Add closest (provable) encloser NSEC3.
*/