From: Eric Hodel <drbrain@...7.net>
Date: 2003-01-27T07:37:38+09:00
Subject: Re: Getting the dynamic IP address of a dialup interface (ppp0)


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Mauricio Fern?ndez (batsman.geo@yahoo.com) wrote:

>=20
> I need to get the dynamic IP address of the ppp0 interface
> (point-to-point) under Linux. I cannot do a reverse DNS
> lookup since the associated name is dynamic too (something like
> user-bla-bla-IP-.someisp.com), and I would prefer to avoid parsing
> `/sbin/ifconfig` since
>  a) I don't know how reliable it would be (and it's ugly anyway)
>  b) I cannot get sample output to work on since I have no access to the
> remote machine (I was planning on somebody installing my script that)
>=20
> [Context: I'm binding a socket to that interface and sending the IP and
> port info w/ UDP to another computer (server) behind a firewall that then
> connects to the client. This is all required because of quite draconian
> firewalling rules (my machine is behind _THREE_ different firewalls,
> ouch!)]

ifconfig should be virtually the same everywhere, so parsing should be
something like this: (works on FreeBSD)
http://segment7.net/ruby-code/snippits/get_ip.rb

--=20
Eric Hodel - drbrain@segment7.net - http://segment7.net
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