unban.rb

if __FILE__ == $0

	ip = ARGV[0]

	if not ip =~ /^\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}$/
		$stderr.puts "'#{ip}' is not a valid IP"
		exit
	end

	`/etc/init.d/denyhosts stop`

	DenyHostsDir = '/var/lib/denyhosts/'

	Files = ['hosts', 'hosts-restricted', 'hosts-root', 'hosts-valid', 'user-hosts'].map{ |fn|
		"#{DenyHostsDir}#{fn}"
	}.APPEND('/etc/hosts.deny')

	Files.each{|fn|
		data = File.open(fn,'r'){|f| f.read }.lines.select{|l| not l =~ /#{ip}/ }.join("\n")
		File.open(fn,'w'){|f| f.write data }
	}

	`/etc/init.d/denyhosts start`
end