1 files changed, 55 insertions, 0 deletions
diff --git a/scripts/iax2-version.nse b/scripts/iax2-version.nse
new file mode 100644
index 0000000..14a64a5
--- /dev/null
+++ b/scripts/iax2-version.nse
@@ -0,0 +1,55 @@
+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