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local nmap = require "nmap"
local shortport = require "shortport"
description = [[
Retrieves or sets the ready message on printers that support the Printer
Job Language. This includes most PostScript printers that listen on port
9100. Without an argument, displays the current ready message. With the
<code>pjl_ready_message</code> script argument, displays the old ready
message and changes it to the message given.
]]
---
-- @arg pjl_ready_message Ready message to display.
-- @output
-- 9100/tcp open jetdirect
-- |_ pjl-ready-message: "READY" changed to "p0wn3d pr1nt3r"
-- @usage
-- nmap --script=pjl-ready-message.nse \
-- --script-args='pjl_ready_message="your message here"'
author = "Aaron Leininger"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"intrusive"}
portrule = shortport.port_or_service(9100, "jetdirect")
local function parse_response(response)
local msg
local line
for line in response:gmatch(".-\n") do
msg = line:match("^DISPLAY=\"(.*)\"")
if msg then
return msg
end
end
end
action = function(host, port)
local status --to be used to grab the existing status of the display screen before changing it.
local newstatus --used to repoll the printer after setting the display to check that the probe worked.
local statusmsg --stores the PJL command to get the printer's status
local response --stores the response sent over the network from the printer by the PJL status command
statusmsg="@PJL INFO STATUS\r\n"
local rdymsg="" --string containing text to send to the printer.
local rdymsgarg="" --will contain the argument from the command line if one exists
local socket = nmap.new_socket()
socket:set_timeout(15000)
local try = nmap.new_try(function() socket:close() end)
try(socket:connect(host, port))
try(socket:send(statusmsg)) --this block gets the current display status
local data
response,data=socket:receive()
if not response then --send an initial probe. If no response, send nothing further.
socket:close()
if nmap.verbosity() > 0 then
return "No response from printer: "..data
else
return nil
end
end
status = parse_response(data)
if not status then
if nmap.verbosity() > 0 then
return "Error reading printer response: "..data
else
return nil
end
end
rdymsgarg = nmap.registry.args.pjl_ready_message
if not rdymsgarg then
if status then
return "\""..status.."\""
else
return nil
end
end
rdymsg="@PJL RDYMSG DISPLAY = \""..rdymsgarg.."\"\r\n"
try(socket:send(rdymsg)) --actually set the display message here.
try(socket:send(statusmsg)) --this block gets the status again for comparison
response,data=socket:receive()
if not response then
socket:close()
return "\""..status.."\""
end
newstatus=parse_response(data)
if not newstatus then
socket:close()
return "\""..status.."\""
end
socket:close()
return "\""..status.."\" changed to \""..newstatus.."\""
end
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