https://tools.ietf.org/html/draft-ietf-dnsop-edns-client-subnet-04
Using the above spec, an intermediate resolver may forward a chunk of
the client's IP address to the authoritative resolver.
Setting edns_client_subnet_private to a getdns_context in stub mode
will indicate to the next-hop recursive resolver that the client
wishes to keep their address information private.
This reverts commit d0ff5d8fea.
It does need to be exposed and is used inderectly through GETDNS_MALLOC which uses MF_PLAIN which is an alias for plain_mem_funcs_user_arg.
- set and get functions are added.
- Existing transport functions retained for backwards compatibility.
- Basic combinations work as before, but underlying functional changes and cleanup are not complete yet...
- Context level options for timeouts and max_transactions_per_tcp_connection coming soon...