Re: Getting multiple IP addresses using luasocket

[Oliver Kroth <oliver.kroth@...>]

Hi Paul,

socket.dns.toip() calls internally something like gethostbyname, which 
returns a pointer to a struct hostent.

This may (depending on OS) inlcude a list of other IP addresses for the 
same name.
From this structure, the socket library's function inet_pushresolved() 
creates a Lua table like
{
    name="hostname";
    alias={"hostname"; "othename"}
    ip={"192.168.0.1"; "172.0.16.1"};
}

If you don't get this, you may have to change something in the socket 
library's sources, or in your OS :-)

Oliver




Am 12.01.2014 23:47, schrieb Paul K:
> Hi All,
>
> I've been using socket.dns.toip(socket.dns.gethostname()) to get the
> IP address of the computer my application is running on, but came
> across several situations when the hostname doesn't resolve. It's
> possible to configure it manually, but I'd prefer to have a way to
> enumerate all known IP addresses and pick those that match some
> conditions I'm interested in (for example, first ip4 non-loopback
> address).
>
> Is something like this possible with luasocket? I've seen other socket
> libraries using getifaddrs (not sure about Windows, but there is
> sockets.addressfamily with similar functionality [1]), but don't see
> any of these methods being used in luasocket.
>
> Paul.
>
> [1] http://msdn.microsoft.com/en-us/library/system.net.sockets.addressfamily(v=vs.110).aspx