id = "Stealth SSH version"

description = "Connects to an SSH server, queries the version string and echos it back. This tends to result\
in the scanning attempt not being logged by the ssh daemon on the target."

author = "Diman Todorov <diman.todorov@gmail.com>"

license = "See nmaps COPYING for licence"

categories = {"demo"}

require "shortport"

portrule = shortport.service("ssh")

action = function(host, port)
	local result, socket

	local catch = function()
		socket:close()
	end

	local try = nmap.new_try(catch)

	result = ""
	socket = nmap.new_socket()

	try(socket:connect(host.ip, port.number))

	result = try(socket:receive_lines(1));
	try(socket:send(result))
	try(socket:close())

	return "" .. string.gsub(result, "\n", "") 
end