Zone node now keeps track of other nodes that hold some referrence
  to it (e.g. through CNAME or additional records).
Added function zn_add_referrer() to set referrer for given type.
Removed function zn_add_ref_cname() and its functionality merged to
  zn_add_ref().

GLUEs found in authoritative data are extracted, those found in
  other delegations are ignored (out-of-bailiwick).
Adjusting of zone node ends after it finds CNAME or delegation.

Zone adjustments now add A/AAAA references for SRV records.
Nameserver adds these records to Additional section.
Modified zone node flags (now 16 bit).

If EDNS is enabled and the sender supports it, maximum packet size
  is set to minimum of the sender's and nameserver's EDNS UDP
  payload.

Fixed typo in zn_add_ref_cname().

Counting truncation while adding RRSets into the packet.
Some RRSets are added/omitted as a whole, some per RR (should
  change later maybe).
Using the edns_udp_payload field of the packet to hold maximum
  allowed size for the packet. Overriding before converting to wire
  format.
RRSets' size is counted by iterating over RRs - this is redundant,
  we may also copy the RRs in the same time (which would however
  result in having incomplete RRSets in the response).
Setting TC bit when omitting referral NS, glue or anything from
  Answer section.

Skip list (skip_destroy_list())  was not freeing the head.
Dispatcher (dpt_destroy()) was not freeing routine_obj.
Nameserver (ns_destroy()) was not freeing error response.
Zone node (zn_destroy()) was not destroying the skip list of
  additional records.
Zone node (zn_add_ref()) was not deleting the created
  zn_ar_rrsets structure if the value was merged in skip_insert().

Zone database destroying changed to delete zone nodes (because
  not all zone nodes are in the zone data structure).
zds_destroy() modified to have the zone node destructor as param.

The key of hash table item was deallocated twice - once as the key
  and once in the zone node (the value). Fixed by adding parameters
  to ck_destroy_table() and ck_remove_item() which tells if the
  key and value should be deallocated (in case of value a pointer
  to destructor is passed).

Changes to other files to acommodate this change.

Needs to watch socket state before closing or different threading model.

Workers are switched on round-robin basis, eliminates data transfer
overhead, as backing store is implicitly shared.

Threading model for TCP needs to be altered to prevent memory errors.

Fixed sm_create_socket() for TCP.

Refactored UDP handler and created stub TCP handler.

ns_put_glues() now copies the glues one by one and if a wildcard
  is encountered, the RR is copied and owner is replaced by name
  found by searching through the NS RRs in Authority section.
  (This approach should be faster than using the zn_get_glue()
   method for each name and type as in that case we would need to
   always iterate through the Authority section and in each
   iteration iterate over the glue records.)

zn_get_glue() now processes wildcard glue records. (The function
  however is not used right now.)

Fix in zdb_process_nonauth() (should not free the list of names).
Changed zdb_dname_list_contains() to zdb_dname_list_find() which
  returns the found name. Not utilized now. (May change back later)

Function ns_follow_cname() generalized to put RRs to given section.

Once again putting RRSets to packet separated into generic function
  ns_put_rrset(), now with wildcard processing.

ns_put_additional() now puts all additional RRSets into the packet,
  not only for given type (either way was iterating through the
  whole Answer section).
ns_put_additional() now processes CNAMEs.

zdb_adjust_additional() now saves also pointer to node with CNAME
  record, to be used in answering.

Structure zn_ar_rrsets modified to be able to hold pointer to CNAME
  node. TODO: consider using union to save space.

Added zn_add_ref_cname() to add CNAME additional reference.
  TODO: is copy-pasted from zn_add_ref(), consider refactoring.

Fix: CNAME following was processing even the last (canonical name)
     node.
Fix: ns_put_answer() was completely omitting answers when they're
     not wildcards.

zdb_find_name_in_list() edited to accept also wildcard nodes.

Was not marking the node as CNAME if the canonical name node was
  not present.
Was not copying the last CNAME record in chain if the next
  canonical name was not present.

Not freeing the * domain name when creating wildcard name.
Not freeing the packet wire format data returned by
  ldns_pkt2wire() in ns_response_to_wire().
Not freeing the ldns_pkt structure when creating error packet in
  ns_create().

The copied question section in ns_create_empty_response() was
  never deallocated. Now the question section is not copied.

ns_create_empty_response() was copying the question RR list, but
  this was never deallocated.
ns_follow_cname() saved the RR to the list of copied RRs even if it
  was not copied.
Freeing of the created wildcard name in ns_answer().

BUG: still major memory leaks present!!!

Query processing changed to accomodate proper wildcard processing
  (see the new flowchart). Used one ugly goto, but cannot think
  about any workaround right now.

If a wildcard is encountered when getting answers (or resolving
  CNAME chain), the corresponding RRs are now copied into the
  response packet and saved to a list of copied RRs for further
  deallocation.

Removed ns_put_rrset(), as in case of answers we needed to perform
  the wildcard checks.

Fix: Freeing of the copied qname in ns_answer().

Now adding additional A/AAAA records for NS and MX records in
  answer section.
Rewritten ns_put_additional() - now puts only the desired records.
Zone node API for saving and getting node references cleaned up:
 - zn_add_ref_*() and zn_get_ref_*() replaced by generic functions
   zn_add_ref() and zn_get_refs().
 - redundant union members ns and mx replaced by generic member
   additional.

zdb_adjust_mx() converted to generic zdb_adjust_additional().
Fixed typo in zn_add_ref_ns().

Added zdb_adjust_mx() for searching and saving A/AAAA RRSets
  corresponding to MX records in a node.
Added ns_put_additional() for adding additional RRSets into the
  response. Currently supports only MX.
Bugfix in skip_first() - was returning head instead of the first
  real item.

Zone node get_ref_* functions now return NULL if there is no such
  reference in the node.