// Sort A1 and A2 according to the values in A1
static void sort(StringArray& a1, StringArray& a2)
{
assert(a1.size() == a2.size());
// Shell sort -- simple and fast
int h = 1;
do {
h = h * 3 + 1;
} while (h <= a1.size());
do {
h /= 3;
for (int i = h; i < a1.size(); i++)
{
string v1 = a1[i];
string v2 = a2[i];
int j;
for (j = i; j >= h && smart_compare(a1[j - h], v1) > 0; j -= h)
{
a1[j] = a1[j - h];
a2[j] = a2[j - h];
}
if (i != j)
{
a1[j] = v1;
a2[j] = v2;
}
}
} while (h != 1);
}
/** Find rrset. If equal to previous it is fast. hash if not so.
* @param msg: the message with hash table.
* @param pkt: the packet in wireformat (needed for compression ptrs).
* @param dname: pointer to start of dname (compressed) in packet.
* @param dnamelen: uncompressed wirefmt length of dname.
* @param type: type of current rr.
* @param dclass: class of current rr.
* @param hash: hash value is returned if the rrset could not be found.
* @param rrset_flags: is returned if the rrset could not be found.
* @param prev_dname_first: dname of last seen RR. First seen dname.
* @param prev_dname_last: dname of last seen RR. Last seen dname.
* @param prev_dnamelen: dname len of last seen RR.
* @param prev_type: type of last seen RR.
* @param prev_dclass: class of last seen RR.
* @param rrset_prev: last seen RRset.
* @param section: the current section in the packet.
* @param region: used to allocate temporary parsing data.
* @return 0 on out of memory.
*/
static int
find_rrset(struct msg_parse* msg, sldns_buffer* pkt, uint8_t* dname,
size_t dnamelen, uint16_t type, uint16_t dclass, hashvalue_t* hash,
uint32_t* rrset_flags,
uint8_t** prev_dname_first, uint8_t** prev_dname_last,
size_t* prev_dnamelen, uint16_t* prev_type,
uint16_t* prev_dclass, struct rrset_parse** rrset_prev,
sldns_pkt_section section, struct regional* region)
{
hashvalue_t dname_h = pkt_hash_rrset_first(pkt, dname);
uint16_t covtype;
if(*rrset_prev) {
/* check if equal to previous item */
if(type == *prev_type && dclass == *prev_dclass &&
dnamelen == *prev_dnamelen &&
smart_compare(pkt, dname, *prev_dname_first,
*prev_dname_last) == 0 &&
type != LDNS_RR_TYPE_RRSIG) {
/* same as previous */
*prev_dname_last = dname;
return 1;
}
/* check if rrsig over previous item */
if(type == LDNS_RR_TYPE_RRSIG && dclass == *prev_dclass &&
pkt_rrsig_covered_equals(pkt, sldns_buffer_current(pkt),
*prev_type) &&
smart_compare(pkt, dname, *prev_dname_first,
*prev_dname_last) == 0) {
/* covers previous */
*prev_dname_last = dname;
return 1;
}
}
/* find by hashing and lookup in hashtable */
*rrset_flags = pkt_rrset_flags(pkt, type, section);
/* if rrsig - try to lookup matching data set first */
if(type == LDNS_RR_TYPE_RRSIG && pkt_rrsig_covered(pkt,
sldns_buffer_current(pkt), &covtype)) {
*hash = pkt_hash_rrset_rest(dname_h, covtype, dclass,
*rrset_flags);
*rrset_prev = msgparse_hashtable_lookup(msg, pkt, *hash,
*rrset_flags, dname, dnamelen, covtype, dclass);
if(!*rrset_prev && covtype == LDNS_RR_TYPE_NSEC) {
/* if NSEC try with NSEC apex bit twiddled */
*rrset_flags ^= PACKED_RRSET_NSEC_AT_APEX;
*hash = pkt_hash_rrset_rest(dname_h, covtype, dclass,
*rrset_flags);
*rrset_prev = msgparse_hashtable_lookup(msg, pkt,
*hash, *rrset_flags, dname, dnamelen, covtype,
dclass);
if(!*rrset_prev) /* untwiddle if not found */
*rrset_flags ^= PACKED_RRSET_NSEC_AT_APEX;
}
if(!*rrset_prev && covtype == LDNS_RR_TYPE_SOA) {
/* if SOA try with SOA neg flag twiddled */
*rrset_flags ^= PACKED_RRSET_SOA_NEG;
*hash = pkt_hash_rrset_rest(dname_h, covtype, dclass,
*rrset_flags);
*rrset_prev = msgparse_hashtable_lookup(msg, pkt,
*hash, *rrset_flags, dname, dnamelen, covtype,
dclass);
if(!*rrset_prev) /* untwiddle if not found */
*rrset_flags ^= PACKED_RRSET_SOA_NEG;
}
if(*rrset_prev) {
*prev_dname_first = (*rrset_prev)->dname;
*prev_dname_last = dname;
*prev_dnamelen = dnamelen;
*prev_type = covtype;
*prev_dclass = dclass;
return 1;
}
}
if(type != LDNS_RR_TYPE_RRSIG) {
int hasother = 0;
/* find matching rrsig */
*hash = pkt_hash_rrset_rest(dname_h, LDNS_RR_TYPE_RRSIG,
dclass, 0);
*rrset_prev = msgparse_hashtable_lookup(msg, pkt, *hash,
0, dname, dnamelen, LDNS_RR_TYPE_RRSIG,
dclass);
if(*rrset_prev && rrset_has_sigover(pkt, *rrset_prev, type,
&hasother)) {
/* yes! */
*prev_dname_first = (*rrset_prev)->dname;
*prev_dname_last = dname;
*prev_dnamelen = dnamelen;
*prev_type = type;
*prev_dclass = dclass;
*rrset_prev = change_rrsig_rrset(*rrset_prev, msg,
pkt, type, *rrset_flags, hasother, section,
region);
if(!*rrset_prev) return 0;
return 1;
}
}
*hash = pkt_hash_rrset_rest(dname_h, type, dclass, *rrset_flags);
*rrset_prev = msgparse_hashtable_lookup(msg, pkt, *hash, *rrset_flags,
dname, dnamelen, type, dclass);
if(*rrset_prev)
*prev_dname_first = (*rrset_prev)->dname;
else *prev_dname_first = dname;
*prev_dname_last = dname;
*prev_dnamelen = dnamelen;
*prev_type = type;
*prev_dclass = dclass;
return 1;
}