This is what I came up with. It's been tested on both 32-bit and 64-bit Linux (amd64).
If you call IfAddrs::get() and you only get a single interface name/address pair, test it via isunroutable(). If the address ISN'T unroutable, then you shouldn't be seeing anyone connecting to you with this address as the helo (i.e. it's yours and unique). On the other hand, if, like me, your local address *is* unroutable, then it means that you're behind a firewall, and need to do a gethostbyname() on your own name to figure out what your outside address is (i.e. what the address of your firewall is that proxies for you). -Philip
myips.pm
Description: Perl program
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