uint8_t* dname_get_shared_topdomain(uint8_t* d1, uint8_t* d2)
{
int labs1, labs2, m;
size_t len = LDNS_MAX_DOMAINLEN;
labs1 = dname_count_labels(d1);
labs2 = dname_count_labels(d2);
(void)dname_lab_cmp(d1, labs1, d2, labs2, &m);
dname_remove_labels(&d1, &len, labs1-m);
return d1;
}
/**
* Given a qname and its proven closest encloser, calculate the "next
* closest" name. Basically, this is the name that is one label longer than
* the closest encloser that is still a subdomain of qname.
*
* @param qname: query name.
* @param qnamelen: length of qname.
* @param ce: closest encloser
* @param nm: result name.
* @param nmlen: length of nm.
*/
static void
next_closer(uint8_t* qname, size_t qnamelen, uint8_t* ce,
uint8_t** nm, size_t* nmlen)
{
int strip = dname_count_labels(qname) - dname_count_labels(ce) -1;
*nm = qname;
*nmlen = qnamelen;
if(strip>0)
dname_remove_labels(nm, nmlen, strip);
}
int
val_rrset_wildcard(struct ub_packed_rrset_key* rrset, uint8_t** wc)
{
struct packed_rrset_data* d = (struct packed_rrset_data*)rrset->
entry.data;
uint8_t labcount;
int labdiff;
uint8_t* wn;
size_t i, wl;
if(d->rrsig_count == 0) {
return 1;
}
labcount = rrsig_get_labcount(d, d->count + 0);
/* check rest of signatures identical */
for(i=1; i<d->rrsig_count; i++) {
if(labcount != rrsig_get_labcount(d, d->count + i)) {
return 0;
}
}
/* OK the rrsigs check out */
/* if the RRSIG label count is shorter than the number of actual
* labels, then this rrset was synthesized from a wildcard.
* Note that the RRSIG label count doesn't count the root label. */
wn = rrset->rk.dname;
wl = rrset->rk.dname_len;
/* skip a leading wildcard label in the dname (RFC4035 2.2) */
if(dname_is_wild(wn)) {
wn += 2;
wl -= 2;
}
labdiff = (dname_count_labels(wn) - 1) - (int)labcount;
if(labdiff > 0) {
*wc = wn;
dname_remove_labels(wc, &wl, labdiff);
return 1;
}
return 1;
}
/** enter implicit transparent zone for local-data: without local-zone: */
static int
lz_setup_implicit(struct local_zones* zones, struct config_file* cfg)
{
/* walk over all items that have no parent zone and find
* the name that covers them all (could be the root) and
* add that as a transparent zone */
struct config_strlist* p;
int have_name = 0;
int have_other_classes = 0;
uint16_t dclass = 0;
uint8_t* nm = 0;
size_t nmlen = 0;
int nmlabs = 0;
int match = 0; /* number of labels match count */
init_parents(zones); /* to enable local_zones_lookup() */
for(p = cfg->local_data; p; p = p->next) {
uint8_t* rr_name;
uint16_t rr_class;
size_t len;
int labs;
if(!get_rr_nameclass(p->str, &rr_name, &rr_class)) {
log_err("Bad local-data RR %s", p->str);
return 0;
}
labs = dname_count_size_labels(rr_name, &len);
lock_rw_rdlock(&zones->lock);
if(!local_zones_lookup(zones, rr_name, len, labs, rr_class)) {
if(!have_name) {
dclass = rr_class;
nm = rr_name;
nmlen = len;
nmlabs = labs;
match = labs;
have_name = 1;
} else {
int m;
if(rr_class != dclass) {
/* process other classes later */
free(rr_name);
have_other_classes = 1;
lock_rw_unlock(&zones->lock);
continue;
}
/* find smallest shared topdomain */
(void)dname_lab_cmp(nm, nmlabs,
rr_name, labs, &m);
free(rr_name);
if(m < match)
match = m;
}
} else free(rr_name);
lock_rw_unlock(&zones->lock);
}
if(have_name) {
uint8_t* n2;
struct local_zone* z;
/* allocate zone of smallest shared topdomain to contain em */
n2 = nm;
dname_remove_labels(&n2, &nmlen, nmlabs - match);
n2 = memdup(n2, nmlen);
free(nm);
if(!n2) {
log_err("out of memory");
return 0;
}
log_nametypeclass(VERB_ALGO, "implicit transparent local-zone",
n2, 0, dclass);
if(!(z=lz_enter_zone_dname(zones, n2, nmlen, match,
local_zone_transparent, dclass))) {
return 0;
}
lock_rw_unlock(&z->lock);
}
if(have_other_classes) {
/* restart to setup other class */
return lz_setup_implicit(zones, cfg);
}
return 1;
}
