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local comm = require "comm"
local nmap = require "nmap"
local shortport = require "shortport"
local string = require "string"
description = [[
Detects the UDP IAX2 service.
The script sends an Inter-Asterisk eXchange (IAX) Revision 2 Control Frame POKE
request and checks for a proper response. This protocol is used to enable VoIP
connections between servers as well as client-server communication.
]]
---
-- @usage
-- nmap -sU -sV -p 4569 <target>
-- @output
-- PORT STATE SERVICE VERSION
-- 4569/udp closed iax2
author = "Ferdy Riphagen"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"version"}
portrule = shortport.version_port_or_service(4569, nil, "udp")
action = function(host, port)
-- see http://www.cornfed.com/iax.pdf for all options.
local poke = "\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x1e"
local status, recv = comm.exchange(host, port, poke, {timeout=10000})
if not status then
return
end
if (#recv) == 12 then
local byte11 = string.byte(recv, 11)
local byte12 = string.byte(recv, 12)
-- byte11 must be \x06 IAX Control Frame
-- and byte12 must be \x03 or \x04
if ((byte11 == 6) and
(byte12 == 3 or byte12 == 4))
then
nmap.set_port_state(host, port, "open")
port.version.name = "iax2"
nmap.set_port_version(host, port)
end
end
end
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