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2023-01-30

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Ismo Vuorinen
2023-01-30 12:16:20 +02:00
parent 9ba66c7734
commit 16d455a262
6 changed files with 34 additions and 26 deletions
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228
local/bin/x-multi-ping
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#!/usr/bin/env perl
=head1 NAME
multi-ping - Multi-protocol ping wrapper
=head1 SYNOPSIS
multi-ping [--loop|--forever] [--sleep=N] hostname1 hostname2 .. hostnameN
=cut
=head1 DESCRIPTION
This wrapper script will invoke one of 'ping' or 'ping6', as appropriate,
to test the connectivity of a remote host and your route to it.
=cut
=head1 AUTHOR
Steve
--
http://www.steve.org.uk/
=cut
=head1 LICENSE
Copyright (c) 2013-2014 by Steve Kemp. All rights reserved.
This script is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
The LICENSE file contains the full text of the license.
=cut
use strict;
use warnings;
use Getopt::Long;
use Pod::Usage;
#
# Check the dependencies.
#
checkSystem();
#
# Parse the command-line.
#
my %config = parsedOptions();
#
# We could parse arguments here, for the moment we will hard-wire
# a timeout of five seconds.
#
my $timeout = 5;
#
# If we didn't get any arguments then we should complain.
#
if ( scalar @ARGV < 1 )
{
print "Usage: multi-ping hostname1 hostname2 .. hostnameN\n";
exit(1);
}
#
# Process each hostname specified upon the command-line.
#
# Looping if applicable.
#
do
{
foreach my $host (@ARGV)
{
pingHost($host);
}
sleep( $config{ 'sleep' } );
} until ( !$config{ 'loop' } );
=begin doc
Given a hostname lookup both the AAAA & A records. For each result
perform the appropriate ping request.
=end doc
=cut
sub pingHost
{
my ($hostname) = (@_);
#
# If we've been given an URI then we'll remove the leading-scheme
# and use the hostname only.
#
if ( $hostname =~ m!^([a-z]+:\/\/)([^/]+)/?!i )
{
$hostname = $2;
#
# Port might be specified too, drop that if present.
#
if ( $hostname =~ /^(.*):([0-9]+)$/ )
{
$hostname = $1;
}
}
#
# Lookup the IP for the name specified
#
my $res = Net::DNS::Resolver->new;
#
# The two types we'll lookup.
#
# NOTE: This shouldn't be required but my laptop resolver seems to
# struggle with lookups of the type "ANY". Sigh.
#
#
foreach my $type (qw! A AAAA !)
{
my $query = $res->query( $hostname, $type );
if ($query)
{
foreach my $rr ( $query->answer )
{
my $ping_binary =
$rr->type eq "A" ? "ping" :
$rr->type eq "AAAA" ? "ping6" :
"";
if ($ping_binary)
{
my $result = system(
"$ping_binary -c1 -w$timeout -W$timeout $hostname >/dev/null 2>/dev/null"
);
print "Host $hostname - " . $rr->address() .
( ( $result == 0 ) ? " - alive" : " - FAILED" ) . "\n";
}
}
}
else
{
print "WARNING: Failed to resolve $hostname [$type]\n";
}
}
}
=begin doc
Test that we have the required perl dependencies present.
=end doc
=cut
sub checkSystem
{
my $eval = "use Net::DNS;";
## no critic (Eval)
eval($eval);
## use critic
#
# If we don't have Net::DNS we're out of luck.
#
if ($@)
{
print "The required Net::DNS module is missing. Aborting.\n";
exit(1);
}
}
=begin doc
Parse the options and return suitable values.
=end doc
=cut
sub parsedOptions
{
my %vars;
#
# Defaults
#
$vars{ 'loop' } = 0;
$vars{ 'sleep' } = 1;
exit
if (
!GetOptions( "help" => \$vars{ 'help' },
"verbose" => \$vars{ 'verbose' },
"forever" => \$vars{ 'loop' },
"loop" => \$vars{ 'loop' },
"sleep=i" => \$vars{ 'sleep' },
) );
pod2usage(1) if ( $vars{ 'help' } );
return (%vars);
}