--- -- Utility functions to add new discovered targets to Nmap scan queue. -- -- The library lets scripts to add new discovered targets to Nmap scan -- queue. Only scripts that run in the script pre-scanning phase -- (prerule) and the script scanning phase (hostrule and portrule) are -- able to add new targets. Post-scanning scripts (postrule) are not -- allowed to add new targets. -- -- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html -- -- @args newtargets If specified, lets NSE scripts add new targets. -- @args max-newtargets Sets the number of the maximum allowed -- new targets. If set to 0 or less then there -- is no limit. The default value is 0. local type = type local select = select local unpack = unpack local tonumber = tonumber local stdnse = require "stdnse" local nmap = require "nmap" module ("target") -- This is a special variable and it is a global one, so -- scripts can check it to see if adding targets is allowed, -- before calling target.add() function. -- This variable will be set to true if the script argument -- 'newtargets' was specified. ALLOW_NEW_TARGETS = false local newtargets, max_newtargets = stdnse.get_script_args("newtargets", "max-newtargets") if newtargets then ALLOW_NEW_TARGETS = true end if max_newtargets then max_newtargets = tonumber(max_newtargets) else max_newtargets = 0 end --- Local function to calculate max allowed new targets local calc_max_targets = function(targets) if max_newtargets > 0 then local pushed_targets = nmap.new_targets_num() if pushed_targets >= max_newtargets then return 0 elseif (targets + pushed_targets) > max_newtargets then return (max_newtargets - pushed_targets) end end return targets end --- Adds the passed arguments to the Nmap scan queue. -- -- Only prerule, portrule and hostrule scripts can add new targets. -- -- @param targets A variable number of targets. Target is a -- string that represents an IP or a Hostname. If this function -- is called without target arguments then it will return true -- and the number of pending targets (waiting to be scanned). -- @usage -- local status, err = target.add("192.168.1.1") -- local status, err = target.add("192.168.1.1","192.168.1.2",...) -- local status, err = target.add("scanme.nmap.org","192.168.1.1",...) -- local status, err = target.add(unpack(array_of_targets)) -- local status, pending_targets = target.add() -- @return True if it has been able to add a minimum one target, or -- False on failures and if no targets were added. If this -- function is called without target arguments then it will -- return true. -- @return Number of added targets on success, or a string error -- message in case of failures. If this function is called -- without target arguments then it will return the number -- of targets that are in the queue (waiting to be scanned). add = function (...) -- Force the check here, but it would be better if scripts -- check ALLOW_NEW_TARGETS before calling target.add() if not ALLOW_NEW_TARGETS then stdnse.print_debug(1, "ERROR: to add targets run with --script-args 'newtargets'") return false, "to add targets run with --script-args 'newtargets'" end local new_targets = {count = select("#", ...), ...} -- function called without arguments if new_targets.count == 0 then return true, nmap.add_targets() end new_targets.count = calc_max_targets(new_targets.count) if new_targets.count == 0 then stdnse.print_debug(3, "Warning: Maximum new targets reached, no more new targets.") return false, "Maximum new targets reached, no more new targets." end local hosts, err = nmap.add_targets(unpack(new_targets,1,new_targets.count)) if hosts == 0 then stdnse.print_debug(3, "%s", err) return false, err end return true, hosts end