Tips&Tricks A third tip from Toby!

[aru]

 

tobyink

Frequent user

Joined: 08 May 2002

Posts: 185

Location: London, England

 

Post Posted: Sun Aug 04, 2002 7:44 pm Post subject: A third tip from Toby!

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Following on from my uptime2png script and my freaky dial-up settings, here's another useful/useless tip.

 

I am connected to the Internet via a measely dial-up. Boo hoo. I used to be on broadband, and I will be again some day, but until then I have to cope with a connection that cuts itself off every 2 hours and when it reconnects has a totally different IP address!

 

This of course makes it hard for remote users. What I needed was a way for remote users to be able to easily find my IP address.

 

First of all, we create a Perl script that looks at ppp0 and determines your IP address:

 

Code:

#!/usr/bin/perl



$IFCFG   = '/sbin/ifconfig';

$GREP   = '/bin/grep';



$line = `$IFCFG -v ppp0 | $GREP "inet addr"`;

$line = substr($line, 20);

($line, @rest) = split(/ /, $line);

print "$line";

 

Pretty easy eh? Now, as root, save this as /root/get_ppp0_ip.pl. And then chmod 700 ~/get_ppp0_ip.pl.

 

Now open up /etc/ppp/ip-up.local. If it's empty, add this line at the top:

 

Code:

#!/bin/bash

 

Now, at the end of the file, add these lines:

 

Code:

sleep 2

/root/get_ppp0_ip.pl -d > /YOUR_MACHINE_NAME.txt

echo "" >> /YOUR_MACHINE_NAME.txt

echo "Last Updated:"

date >> /YOUR_MACHINE_NAME.txt

sleep 2

 

Obviously, replacing the file name with the name of your computer. Below this, you'll need to add a command to upload /YOUR_MACHINE_NAME.txt to your remote web server (which we assume has a fixed IP!!!)

As in my last tip, ncftpput is your friend here. I am lucky enough to have a server with SSH access which means that I can use scp instead:

 

/bin/su tai -c "scp /ophelia.txt coach:public_html/" (Ophelia is the name of my machine, coach is my web server.)

 

Make sure that you use keys/saved passwords etc so that the script can upload the file!!!

 

 

arusabal

Moderator

Joined: 17 Apr 2002

Posts: 836

Location: Spain

Post Posted: Sun Aug 04, 2002 10:50 pm Post subject: Re: A third tip from Toby!

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For those who doesn't know perl or have personal affairs against it, I suggest:

 

Code:

$ /sbin/ifconfig | grep P-t-P | awk '{print $2}' | awk -F ":" '{print $2}'

 

Or better:

Code:

$ /sbin/ifconfig | awk '/P-t-P/ {print substr($2,6)}'

 

 

 

DOlson

Moderator

Joined: 16 Apr 2002

Posts: 2393

Location: Canada

Post Posted: Sun Aug 04, 2002 11:49 pm Post subject:

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I did this already using PHP. I thought that I posted it before... I guess not.

 

Anyhow, here's the URL:

 

http://mdkxp.by-a.com/rpm/ipupdate.tar.gz

 

It works great, and it even allows you to upload it to an FTP server so someone can just view an html page to find your current IP.

 

 

 

Editor's note: This thread was originally posted at the old MUB (Mandrake User Board at club-nihil). This post is the result of a 99% automatic backup, so due to its nature some text may be lost (improbable but possible).