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local nmap = require "nmap"
local stdnse = require "stdnse"
local string = require "string"
local os = require "os"
local table = require "table"
local rand = require "rand"
description = [[
Discovers Jenkins servers on a LAN by sending a discovery broadcast probe.
For more information about Jenkins auto discovery, see:
* https://wiki.jenkins.io/display/JENKINS/Auto-discovering+Jenkins+on+the+network
]]
---
-- @usage nmap --script broadcast-jenkins-discover
-- @usage nmap --script broadcast-jenkins-discover --script-args timeout=15s
--
-- @output
-- Pre-scan script results:
-- | broadcast-jenkins:
-- | Version: 2.60.2; Server ID: d5e31b7a9d69cf3c89cc799c23199760; Slave Port: 35928
-- |_ Version: 2.60.2; Server ID: b98e8e1b862c3eecb14e8be0028cf4ee; Slave Port: 45435
--
-- @args broadcast-jenkins.address
-- address to which the probe packet is sent. (default: 255.255.255.255)
-- @args broadcast-jenkins.timeout
-- socket timeout (default: 5s)
---
author = "Brendan Coles"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"discovery", "broadcast", "safe"}
prerule = function() return ( nmap.address_family() == "inet") end
local arg_address = stdnse.get_script_args(SCRIPT_NAME .. ".address")
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME .. ".timeout"))
action = function()
local host = { ip = arg_address or "255.255.255.255" } -- broadcast
-- local host = { ip = arg_address or "239.77.124.213" } -- multicast
local port = { number = 33848, protocol = "udp" }
local socket = nmap.new_socket("udp")
socket:set_timeout(500)
-- send two packets, just in case
local probe = rand.random_string(10)
for i=1,2 do
local status = socket:sendto(host, port, probe)
if ( not(status) ) then
return stdnse.format_output(false, "Failed to send broadcast probe")
end
end
local timeout = tonumber(arg_timeout) or ( 20 / ( nmap.timing_level() + 1 ) )
local results = {}
local stime = os.time()
-- listen until timeout
repeat
local status, data = socket:receive()
if ( status ) then
local jenkins_pkt = data:match("^<hudson>(.+)</hudson>")
if ( jenkins_pkt ) then
local status, _, _, rhost, _ = socket:get_info()
local version = jenkins_pkt:match("<version>(.*)</version>")
local server_id = jenkins_pkt:match("<server%-id>(.*)</server%-id>")
local slave_port = jenkins_pkt:match("<slave%-port>(.*)</slave%-port>")
if version and server_id and slave_port then
stdnse.print_debug(2, "Received Jenkins discovery response from %s (%s bytes)", rhost, string.len(jenkins_pkt))
local str = ("Version: %s; Server ID: %s; Slave Port: %s"):format(version, server_id, slave_port)
table.insert( results, str )
end
end
end
until( os.time() - stime > timeout )
socket:close()
local response = stdnse.output_table()
if #results > 0 then
-- remove duplicates
local hash = {}
for _,v in ipairs(results) do
if (not hash[v]) then
table.insert( response, v )
hash[v] = true
end
end
return response
end
end
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