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 -- @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