DHCPCD

lintadsl · 10-22-2002, 11:16 AM

Hi there,
First of all, I have no problem with DHCPCD on my box.
Any one knows that from Client, how to get a new IP whenever DHCP server release new IP and send ifconfig to yahoo email account?
I used pppoe for ADSL and any time re-connected, it send email to my yahoo account with new IP address. Now I moved to Cable modem which requires DHCPCD. I looked some conf files related DHCP but could not fine a right spot to put my email address to get new IP.

Thanks in advance
Regards,
Lint

jeremy · 11-02-2002, 02:14 PM

I didn't test this and it's a little ugly but it *should* work:

Code:

#!/usr/bin/perl 

# This script will get the current IP and mail it to me if it has changed.


my $ip = `/sbin/ifconfig | grep -A1 eth1 | tail -1 | cut -d : -f 2 | cut -d ' ' -f 1`;
open(FILE,"/var/ip/ip") || die "couldn't open file $!";
my $oldip = <FILE>;
chomp $oldip;
chomp $ip;

if ($ip ne $oldip) {
        $message = "Your new IP is $ip.  It's " . scalar(localtime) . ".";
        `echo "$message" | mail -s IP email\@domain.com`;
        `echo "$ip" > /var/ip/ip`; 
}

Note that eth1 needs to be changed to the interface connected to the cable modem.

--jeremy

lintadsl · 11-04-2002, 08:30 AM

So, only thing I need to change is my email address in your script? I am using eth1 to Cable modem. Please correct me if i am wrong. I am thinking I need to defind FILE from "my $oldip = <FILE>;" line. Don't I?
Better let you know I am network guy not programmer. ^_^.

Thanks again. It is exciting to hear since I have not get any respond from others.

Lint.

acid_kewpie · 11-04-2002, 08:51 AM

The FILE thing is fine, but you'll need to create the ip file yourself before you run jeremy's script, as it will always fail otherwise, so "mkdir /var/ip; touch /var/ip/ip"

lintadsl · 11-04-2002, 10:16 AM

Thanks, Chris. I will try that and let you gus know how it goes.
So, this script should be running all the time in background?
If this works, then it would be pretty handy to know everyone who uses cable modem with dinamic IP.

Lintadsl

jeremy · 11-04-2002, 11:54 AM

You would have to run it via cron.

--jeremy