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I must write a C/C++ program which works a little bit like dig and nslookup: it must know IP addresses of any site. It should do things like the dig http://www.example.com MX +short command does. I can’t imagine how can this be done. Any ideas?
Use any resolver library you like. Popular libraries include UDNS and adns. You could also just modify the source code to
dig(which is part of the bind distribution).