* multi-threading - use pthread.h?
* can't handle wildcarded domains that return more than one IP address on
non-existing subdomains
test domain: proboards.com
* allow using a customized list of DNS server to share network load
* allow using DNS server supplied on the command line
* for openDNS users: document how to permanently change DNS server
settings so they are not overwritten by DHCP settings
* convert hostent structs to addrinfo ?
* replace inet_ntoa(*((struct in_addr *)host->h_addr_list[j])) with ipstr
* obtain aliases for each domain (CNAME records)?
* clever numerical domain bruteforce for clusters. i.e.: www2, www3
* pickup new subdomains via reverse lookups (PTR records)
* better input validation
improve function that validates target domain
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