New docker-version script

http://seclists.org/nmap-dev/2014/q3/265

scripts/docker-version.nse

@@ -0,0 +1,36 @@
+local shortport =  require "shortport"
+local json = require "json"
+local http = require "http"
+local nmap = require "nmap"
+
+description = [[Detects the Docker service version.]]
+
+---
+-- @output
+-- PORT     STATE SERVICE VERSION
+-- 2375/tcp open  docker  Docker 1.1.2
+
+author = "Claudio Criscione"
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+categories = {"version"}
+
+portrule = shortport.version_port_or_service({2375, 2376}, {"docker", "docker-s"}, "tcp")
+
+action = function(host, port)
+
+  local http_response = http.get(host, port, "/version")
+  if not http_response or not http_response.status or
+    http_response.status ~= 200 or not http_response.body then
+    return
+  end
+
+  local ok_json, response = json.parse(http_response.body)
+  if ok_json and response["Version"] and response["GitCommit"] then
+    ---Detected
+    port.version.name = response["Version"]
+    port.version.product = "Docker"
+    nmap.set_port_version(host, port)
+    return
+  end
+  return
+end