Re: Retrieve public IP

[Philipp Janda <siffiejoe@...>]

Hi!

Am 25.05.2015 um 08:18 schröbte Claudio Mussoni:
> Hello to everyone,I need to get the public address from my router with LUA.
> This is a PHP example:  $my_public_ip = $_SERVER['REMOTE_ADDR'];
> I searched around but I' ve not found examples.Someone can help me out?Thank's a lot.ByeClaudio

If you have a connected TCP socket (like PHP probably does), that's easy:

    local address, port = s:getsockname()   -- LuaSocket[1] or NixIO[2]

If you don't have a connected socket you can query interface information 
using NixIO's `getifaddrs()`[3] function. If you are on an OpenWRT 
Router you probably have NixIO installed already, but LUnix[4] also has 
a binding to that function. You may get multiple results though, and 
you'll have to decide which one is the real external interface.

Or you query an external server like Thijs suggested (which will also 
work if you have some form of masquerading/NAT between your router and 
the internet).

Philipp


  [1]: http://w3.impa.br/~diego/software/luasocket/tcp.html#getsockname
  [2]: 
http://luci.subsignal.org/api/nixio/modules/nixio.Socket.html#Socket.getsockname
  [3]: 
http://luci.subsignal.org/api/nixio/modules/nixio.html#nixio.getifaddrs
  [4]: http://www.25thandclement.com/~william/projects/lunix.html