Our ISP at work is a bit unreliable, so we started keeping a log of how often our service goes up and down. I wrote this script to automate the task.

It works by using LWP to download the header of a reliable site every $interval seconds. It makes a log entry every time the service goes up or down.

Many thanks to tye and arhuman, who helped me with a problem of autoflushing the log in open, sleep, & print together cause an error.

Update: ybiC has posted a muchly improved version of this same program here.

An improvement would be to tell it to check a second site if the first one fails.


=head1 NAME =head1 DESCRIPTION Keeps a log of internet up and down time =head1 AUTHOR zeno =head1 SYNOPSIS perl [name_of_logfile interval url_of_website] =head1 ARGUMENTS name_of_logfile - text file to use as log file [display (-) by default] interval - interval in seconds between checks [600 seconds by default] url_of_website - URL of website to try [ by default] =cut #!/usr/bin/perl -w use LWP::Simple; use strict; use warnings; # log file (display by default) my $log = $ARGV[0] ||= '-'; # interval between checks (600) my $interval = $ARGV[1] ||= 600; # site to try (perlmonks by default) my $site = $ARGV[2] ||= ''; my $old_state; my $state; print "Creating Internet Uptime Log at $log "; print "testing $site every $interval seconds.\n"; #changed this to the two arg version for #version < 5.6 compatibility (thanks ybiC) open (OUT, ">>$log") or die "can't open $log: $!"; #this way of setting AUTOFLUSH on the log I got #from tye and arhuman my $selected = select(OUT); $|++; select($selected); $old_state = (defined head($site)); print OUT (localtime).($old_state ? ": up\n" : ": down\n"); close OUT or die; print "".(localtime).($old_state ? ": up\n" : ": down\n"); while (1) { sleep $interval; $state = (defined head($site)); if ($state != $old_state) { # state changed open OUT,">>",$log or die "can't open $log: $!"; print OUT (localtime).($state ? ": up\n" : ": down\n"); close OUT or die; print "".(localtime).($state ? ": up\n" : ": down\n"); $old_state = $state; } }