Why nslookup.exe can resolved with a specified DNS server, but there isn't corresponding API in dnsapi.dll?

Question

nslookup.exe www.google.com 127.0.0.1

This command can resolve using DNS server 127.0.0.1, it's impossible to implement a full stack DNS protocol resolver in a 75.0 KB nslookup.exe, so it must have been using dnsapi.dll.

So which dll export C function can provide similar gethostbyname() with a specified DNS server in dnsapi.dll?

Answer 1

You can use the pExtra parameter to the DNSQuery function.

Apparently the MSDN documentation is incomplete, since it says this parameter must be null.

See http://support.microsoft.com/kb/831226 for an example of its use.