local bin = require "bin"
local ipp = require "ipp"
local shortport = require "shortport"
local stdnse = require "stdnse"
local table = require "table"

description = [[
Lists printers managed by the CUPS printing service.
]]

---
-- @usage
-- nmap -p 631 <ip> --script cups-info
--
-- @output
-- PORT    STATE SERVICE
-- 631/tcp open  ipp
-- | cups-info: 
-- |   Generic-PostScript-Printer
-- |     DNS-SD Name: Lexmark S300-S400 Series @ ubu1110
-- |     Location: 
-- |     Model: Local Raw Printer
-- |     State: Processing
-- |     Queue: 0 print jobs
-- |   Lexmark-S300-S400-Series
-- |     DNS-SD Name: Lexmark S300-S400 Series @ ubu1110
-- |     Location: 
-- |     Model: Local Raw Printer
-- |     State: Stopped
-- |     Queue: 0 print jobs
-- |   PDF
-- |     DNS-SD Name: PDF @ ubu1110
-- |     Location: 
-- |     Model: Generic CUPS-PDF Printer
-- |     State: Idle
-- |_    Queue: 0 print jobs
--

author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"safe", "discovery"}


portrule = shortport.port_or_service(631, "ipp", "tcp", "open")

local function fail(err) return ("\n  ERROR: %s"):format(err or "") end

action = function(host, port)

	local helper = ipp.Helper:new(host, port)
	if ( not(helper:connect()) ) then
		return fail("Failed to connect to server")
	end
	
	local status, printers = helper:getPrinters()
	if ( not(status) ) then
		return
	end
	
	local output = {}
	for _, printer in ipairs(printers) do
		local states = {
			[ipp.IPP.PrinterState.IPP_PRINTER_IDLE] = "Idle",
			[ipp.IPP.PrinterState.IPP_PRINTER_PROCESSING] = "Processing",
			[ipp.IPP.PrinterState.IPP_PRINTER_STOPPED] = "Stopped",
		}
		local pos, state = bin.unpack(">I", printer.state)
		table.insert(output, { 
			name = printer.name,
			("DNS-SD Name: %s"):format(printer.dns_sd_name or ""),
			("Location: %s"):format(printer.location or ""),
			("Model: %s"):format(printer.model or ""),
			("State: %s"):format(states[state] or ""),
			("Queue: %s print jobs"):format(tonumber(printer.queue_count) or 0),
		} )
	end
	
	if ( 0 ~= #output ) then
		return stdnse.format_output(true, output)
	end
end
