o [NSE] Added the script memcached-info that lists version and statistics

information from the distributed memory object caching service memcached
  [Patrik]

scripts/memcached-info.nse

@@ -0,0 +1,125 @@
+description = [[
+Retrieves information from distributed memory object caching system memcached
+]]
+
+---
+-- @usage
+-- nmap -p 11211 --script memcached-info
+--
+-- @output
+-- 11211/tcp open  unknown
+-- | memcached-info: 
+-- |   Process ID           18568
+-- |   Uptime               6950 seconds
+-- |   Server time          Sat Dec 31 14:16:10 2011
+-- |   Architecture         64 bit
+-- |   Used CPU (user)      0.172010
+-- |   Used CPU (system)    0.200012
+-- |   Current connections  10
+-- |   Total connections    78
+-- |   Maximum connections  1024
+-- |   TCP Port             11211
+-- |   UDP Port             11211
+-- |_  Authentication       no
+--
+
+author = "Patrik Karlsson"
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+categories = {"discovery", "safe"}
+
+require 'shortport'
+require 'tab'
+
+-- currently, we only support the TCP, text based protocol
+portrule = shortport.port_or_service(11211, "memcached", "tcp")
+
+local filter = {
+	
+	["pid"] = { name = "Process ID" },
+	["uptime"] = { name = "Uptime", func = function(v) return ("%d seconds"):format(v) end },
+	["time"] = { name = "Server time", func = function(v) return os.date("%c", v) end },
+	["pointer_size"] = { name = "Architecture", func = function(v) return v .. " bit" end },
+	["rusage_user"] = { name = "Used CPU (user)" },
+	["rusage_system"] = { name = "Used CPU (system)"},
+	["curr_connections"] = { name = "Current connections"},
+	["total_connections"] = { name = "Total connections"},
+	["maxconns"] = { name = "Maximum connections" },
+	["tcpport"] = { name = "TCP Port" },
+	["udpport"] = { name = "UDP Port" },
+	["auth_enabled_sasl"] = { name = "Authentication" }
+	
+}
+
+local order = {
+	"pid", "uptime", "time", "pointer_size", "rusage_user", "rusage_system",
+	"curr_connections", "total_connections", "maxconns", "tcpport", "udpport",
+	"auth_enabled_sasl"
+}
+
+local function fail(err) return ("\n  ERROR: %s"):format(err) end
+
+local function mergetab(tab1, tab2)
+	for k, v in pairs(tab2) do
+		tab1[k] = v
+	end
+	return tab1
+end
+
+local function recvResponse(socket)	
+	local kvs = {}
+	repeat
+		local status, response = socket:receive_buf("\r\n")
+		if ( not(status) ) then
+			return false, "Failed to receive response from server"
+		end
+		local k,v = response:match("^STAT ([^%s]*) (.*)$")
+		if ( k and v ) then
+			kvs[k] = v
+		end
+	until ( "END" == response or "ERROR" == response )
+	
+	return true, kvs
+end
+
+action = function(host, port)
+
+	local socket = nmap.new_socket()
+	socket:set_timeout(10000)
+	local status = socket:connect(host, port)
+	if ( not(status) ) then
+		return fail("Failed to connect to server")
+	end
+
+	status = socket:send("stats\r\n")
+	if ( not(status) ) then
+		return fail("Failed to send request to server")
+	end
+	
+	local status, kvs = recvResponse(socket)
+	if( not(status) ) then
+		return fail(kvs)
+	end
+	
+	status = socket:send("stats settings\r\n")
+	if ( not(status) ) then
+		return fail("Failed to send request to server")
+	end
+	
+	local status, kvs2 = recvResponse(socket)
+	if( not(status) ) then
+		return fail(kvs2)
+	end
+	
+	kvs = mergetab(kvs, kvs2)
+	
+	local result = tab.new(2)
+	for _, item in ipairs(order) do
+		if ( kvs[item] ) then
+			local name = filter[item].name
+			local val = ( filter[item].func and filter[item].func(kvs[item]) or kvs[item] )
+			tab.addrow(result, name, val)
+		end
+	end
+	return stdnse.format_output(true, tab.dump(result))
+
+end