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#!/usr/bin/perl -w
use POSIX;
use IO::Handle;
@targets = ("4.2.2.2", "8.8.8.8", "10.132.128.1");
open $_, "-|", "ping", $_ for @targets;
-d or mkdir for "$ENV{HOME}/tmp";
open LOG, ">>", "$ENV{HOME}/tmp/ping_log.txt";
LOG->autoflush;
while (1) {
$to_print = "";
for (@targets) {
$rin = "";
vec($rin, fileno $_, 1) = 1;
next unless select $rin, undef, undef, 1;
$line = readline $_;
if ($line =~ /bytes from/ and not $status{$_}) {
$status{$_}++;
$to_print .= "$_ up, ";
} elsif ($line =~ /Unreachable/ and $status{$_}) {
$status{$_}--;
$to_print .= "$_ down, ";
}
}
next unless length $to_print;
$to_print = strftime("%c", localtime) . " " . substr $to_print, 0, -2;
print "$to_print\n";
print LOG "$to_print\n";
}
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