Hi to all, this is my first script that I post here. Is a simple way to replace the DDNS free services.

Basically it stores the IP (retrieved from the italian site www.chisono.it) in a text file (that must exist) and checks it whenever the crond daemon decides to do.

The script should be executed by cron not often (for me a nice time would be 30 minutes) and requires a MTA installed on the system to work, and also the mailx app.

The logit function is stolen from http://lexington.pm.org/meetings/022001.html

Every comment is appreciated...I know that there's a lot to do to improve it (such add the file existence check and a library for smtp support) but is my quick-and-dirty interpretation of perl....

#!/usr/bin/perl
 
use strict;
use LWP::Simple;
use Sys::Syslog qw( :DEFAULT setlogsock);

my $dir = "/root/script/";
my $emailadd = "your\@email.com";
my $fromadd = "ipwatch\@yourmachine"; 

chdir $dir;

my $current_ip = get('http://www.chisono.it/ip.asp') || logit('err', "
+Cannot retrieve the IP address: $!\n"); 

my ($a1, $a2, $a3, $a4) = split /\./, $current_ip;

open FILE, "myip.txt" or logit('err', "Cannot open the file: $!\n");

my $readip = <FILE>;
my ($b1, $b2, $b3, $b4) = split /\./, $readip;
 
if ($readip eq $current_ip) {
       logit('info', "Address not changed\n");
} else {
       logit('info', "Address changed: old IP: $readip ; New IP: $curr
+ent_ip\n");
 
       getstore('http://www.chisono.it/ip.asp', 'myip.txt');
 
       system("mailx -s \"IP changed!\" -a \"From: IPWatch <$fromadd>\
+" $emailadd < myip.txt") || logit('err', "Cannot send the email!\n");
}

sub logit {
   my ($priority, $msg) = @_; 
   return 0 unless ($priority =~ /info|err|debug/);
   setlogsock('unix');
   openlog($0, 'pid,cons', 'user');
   syslog($priority, $msg);
   closelog();
   return 1;
}

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In reply to Send your IP by fixed

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