/** find nsec3 closest encloser in neg cache */
static struct val_neg_data*
neg_find_nsec3_ce(struct val_neg_zone* zone, uint8_t* qname, size_t qname_len,
int qlabs, ldns_buffer* buf, uint8_t* hashnc, size_t* nclen)
{
struct val_neg_data* data;
uint8_t hashce[SHA_DIGEST_LENGTH];
uint8_t b32[257];
size_t celen, b32len;
*nclen = 0;
while(qlabs > 0) {
/* hash */
if(!(celen=nsec3_get_hashed(buf, qname, qname_len,
zone->nsec3_hash, zone->nsec3_iter, zone->nsec3_salt,
zone->nsec3_saltlen, hashce, sizeof(hashce))))
return NULL;
if(!(b32len=nsec3_hash_to_b32(hashce, celen, zone->name,
zone->len, b32, sizeof(b32))))
return NULL;
/* lookup (exact match only) */
data = neg_find_data(zone, b32, b32len, zone->labs+1);
if(data && data->in_use) {
/* found ce match! */
return data;
}
*nclen = celen;
memmove(hashnc, hashce, celen);
dname_remove_label(&qname, &qname_len);
qlabs --;
}
return NULL;
}
/** get next closer for nsec3 proof */
static struct ub_packed_rrset_key*
neg_nsec3_getnc(struct val_neg_zone* zone, uint8_t* hashnc, size_t nclen,
struct rrset_cache* rrset_cache, struct regional* region,
uint32_t now, uint8_t* b32, size_t maxb32)
{
struct ub_packed_rrset_key* nc_rrset;
struct val_neg_data* data;
size_t b32len;
if(!(b32len=nsec3_hash_to_b32(hashnc, nclen, zone->name,
zone->len, b32, maxb32)))
return NULL;
(void)neg_closest_data(zone, b32, b32len, zone->labs+1, &data);
if(!data && zone->tree.count != 0) {
/* could be before the first entry ; return the last
* entry (possibly the rollover nsec3 at end) */
data = (struct val_neg_data*)rbtree_last(&zone->tree);
}
while(data && !data->in_use)
data = data->parent;
if(!data)
return NULL;
/* got a data element in tree, grab it */
nc_rrset = grab_nsec(rrset_cache, data->name, data->len,
LDNS_RR_TYPE_NSEC3, zone->dclass, 0, region, 0, 0, now);
if(!nc_rrset)
return NULL;
if(!neg_params_ok(zone, nc_rrset))
return NULL;
return nc_rrset;
}
size_t nsec3_get_nextowner_b32(struct ub_packed_rrset_key* rrset, int r,
uint8_t* buf, size_t max)
{
uint8_t* nm, *zone;
size_t nmlen, zonelen;
if(!nsec3_get_nextowner(rrset, r, &nm, &nmlen))
return 0;
/* append zone name; the owner name must be <b32>.zone */
zone = rrset->rk.dname;
zonelen = rrset->rk.dname_len;
dname_remove_label(&zone, &zonelen);
return nsec3_hash_to_b32(nm, nmlen, zone, zonelen, buf, max);
}
