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|
#!/usr/bin/ruby1.8
#
# NAME
# multi-ping - IPv4 and IPv6 ping tool
#
# SYNOPSIS
# multi-ping [ -h | --help ] [-m | --manual] hostname1
#
# OPTIONS
#
# -h, --help Show a help message, and exit.
#
# -m, --manual Show this manual, and exit.
#
# -v, --verbose Show verbose errors
#
# ABOUT
#
# The multi-ping tool is designed to be IPv4/IPv6-agnostic ping tool,
# which removes the need to know if you're pinging an IPv4 host or an
# IPv6 host.
#
# The tool works by resolving the hostname specified upon the command line,
# and invoking "ping" or "ping6" upon the result - using the correct one for
# the address family which has been returned.
#
# AUTHOR
#
# Steve Kemp <steve@bytemark.co.uk>
#
require 'getoptlong'
require 'socket'
#
# Options set by the command-line. These are all global.
#
$help = false
$manual = false
opts = GetoptLong.new(
[ '--help', '-h', GetoptLong::NO_ARGUMENT ],
[ '--manual', '-m', GetoptLong::NO_ARGUMENT ] )
begin
opts.each do |opt,arg|
case opt
when '--help'
$help = true
when '--manual'
$manual = true
end
end
rescue => err
# any errors, show the help
warn err.to_s
$help = true
end
#
# CAUTION! Here be quality kode.
#
if $manual or $help
# Open the file, stripping the shebang line
lines = File.open(__FILE__){|fh| fh.readlines}[1..-1]
found_synopsis = false
lines.each do |line|
line.chomp!
break if line.empty?
if $help and !found_synopsis
found_synopsis = (line =~ /^#\s+SYNOPSIS\s*$/)
next
end
puts line[2..-1].to_s
break if $help and found_synopsis and line =~ /^#\s*$/
end
exit 0
end
#
# Get the address to ping.
#
hostname = ARGV.shift
#
# If we have no host then abort
#
if ( hostname.nil? )
puts "Usage: #{$0} hostname"
exit 1
end
#
# The IP we'll deal with
#
ip = nil
#
# Lookup the IP, catching any exception
#
begin
Socket.getaddrinfo(hostname, 'echo').each do |a|
ip = a[3]
end
rescue SocketError
puts "Failed to resolve: #{hostname}"
exit 1
end
#
# Was the result an IPv4 address?
#
if ( ip =~ /^([0-9]+).([0-9]+).([0-9]+).([0-9]+)$/ )
#
# If so invoke "ping"
#
if ( system( "ping -c 1 #{ip} 2>/dev/null >/dev/null" ) == true )
puts "#{hostname} alive."
exit 0
else
puts "ping4 failed - #{hostname} [#{ip}]"
exit 1
end
elsif ( ip =~ /2001/ )
#
# Was the result an IPv6 address?
#
if ( system( "ping6 -c 1 -w1 #{ip} 2>/dev/null >/dev/null" ) == true )
puts "#{hostname} alive."
exit 0
else
puts "ping6 failed - #{hostname} [#{ip}]"
exit 1
end
end
#
# All done.
#
|
