-- hostname model methods
module (..., package.seeall)

require ("posix")
require ("fs")

-- no initializer in model - use controller.init for that


-- ################################################################################
-- UNKNOWN

--local function read_file_as_array ( path )
--	local file, error = io.open(path)
--	if ( file == nil ) then
--		return nil, error
--	end
--	local f = {}
--	for line in file:lines() do 
--		table.insert ( f , line )
--	end
--	file:close()
--	return f
--end

local function has_init_script ( f )
	local initprefix = "/etc/init.d/openvpn"
	local file = initprefix .. "." .. f
	if f ~= "openvpn" then
		if ( fs.is_file(file)) then
			init = "yes"
		else
			init = nil
		end
	else
		if ( fs.is_file(initprefix)) then
			init = "yes"
		else
			init = nil
		end
	end
	return init
end

-- ################################################################################
-- LOCAL FUNCTIONS

local function config_content( f )
	local config = {}
	config.name = "/etc/openvpn/" .. f
	local conf_file = fs.read_file_as_array ( config.name )
	for i=1,table.maxn(conf_file) do
		local l = conf_file[i]
		-- Filter out commented lines
		if not string.find ( l, "^[;#].*" ) then
			local a,b = string.match ( l, "^%s*(%S*)%s+(%S*).*$" )	-- Working exept on 'remote xxxxx xxxx'
--			local a,b = string.match ( l, "^%s*(%S*)%s+(.*)%s+$" )	-- This brakes client/server check
			if (a) then
				config[a]=b
			end
		end
	end
	if not ( config.log ) then
		config.log = config["log-append"]
	end
	if not ( config["max-clients"] ) then
		config["max-clients"] = "Unlimited"
	end
	if not ( config["local"] ) then
		config["local"] = "0.0.0.0"
	end
	return config
end


local is_running = function( process, parameters )
	local strsplit = require("split")
	local retval = ""
	local tst = ""
	local pidofsx, error = io.popen("pidof " .. process ,r)
	local pidofs = string.gsub(pidofsx:read("*a"), "\n", "")
	pidofsx:close()
--	if ( pidofs ~= nil ) then
		for v in string.gmatch(pidofs, "%S+") do
			local path = string.gsub("/proc/".. v .. "/cmdline", "%s", "")
			local f,err = io.open(path,r)
			local file_resultx = f:read("*a")
			local file_result = string.match(file_resultx, parameters)
			f:close()
			if ( file_result ) then
				retval = "Running"
			end
		end
--	end
	return retval
end

local function check_valid_config ( f )
	config.err = ""
	if not (config.client) or not (config.ca) or not (config.cert) or not (config.key) or not (config.dev) or not (config.proto) or not (config.remote) then
		config.type = nil
		config.err = ""
		if not (config.ca) then
			config.err = config.err .. "Check CA; "
		end
		if not (config.cert) then
			config.err = config.err .. "Check CERT; "
		end
		if not (config.key) then
			config.err = config.err .. "Check KEY; "
		end
		if not (config.dev) then
			config.err = config.err .. "Check DEV; "
		end
		if not (config.proto) then
			config.err = config.err .. "Check PROTO; "
		end
		if (config.client) or not (config.ca) or not (config.cert) or not (config.key) or not (config.dev) or not (config.proto) or not (config.port) then
			config.type = nil
		else
			config.type = "server"
			config.err = ""
		end
	else
		config.type = "client"
		config.err = ""
	end
	if not (config.type) then config.type = "unknown" end
	return config.type, config.err
end

local function list_conffiles()
	local configfiles = {}
	local config = {}
	local files , errstr, errno = posix.dir ( "/etc/openvpn/" )
	if files then
	  	for k,v in ipairs(files) do
			if string.match (v, "^.*conf$") then
				table.insert ( configfiles, cfe{ name = v } )
			end
		end
	return configfiles
	end
end

-- FIXME: This should probably go in the time/date library
-- This function gives diff (in seconds) between 'date' and current time.

local function monthabbr_to_num ( month )
	local nummonth = ""
	if (string.lower(month) == "jan") then nummonth = "1" end
	if (string.lower(month) == "feb") then nummonth = "2" end
	if (string.lower(month) == "mar") then nummonth = "3" end
	if (string.lower(month) == "apr") then nummonth = "4" end
	if (string.lower(month) == "may") then nummonth = "5" end
	if (string.lower(month) == "jun") then nummonth = "6" end
	if (string.lower(month) == "jul") then nummonth = "7" end
	if (string.lower(month) == "aug") then nummonth = "8" end
	if (string.lower(month) == "sep") then nummonth = "9" end
	if (string.lower(month) == "oct") then nummonth = "10" end
	if (string.lower(month) == "nov") then nummonth = "11" end
	if (string.lower(month) == "dec") then nummonth = "12" end
	return nummonth
end

local function month_to_num ( dt )
	local strsplit = require("split")
	-- date is something like "Fri 11 23 10:34:07 2007"
	local olddate = strsplit(" ",dt)
	local hour,min,sec = string.match ( rawget(olddate,4), "(%d%d):(%d%d):(%d%d)" )
	local olddatetable = { year = rawget(olddate,5), month = rawget(olddate,2), day = rawget(olddate,3), hour = hour, min = min, sec = sec }

	-- fetch current time
	local f,err = io.popen("date")
	currdate = f:read("*l")
	f:close()
	local newdate = strsplit(" ",currdate)
	local hour,min,sec = string.match ( rawget(newdate,4), "(%d%d):(%d%d):(%d%d)" )
	local month = monthabbr_to_num(rawget(newdate,2))
	local newdatetable = { year = rawget(newdate,6), month = nummonth, day = rawget(newdate,3), hour = hour, min = min, sec = sec }

--	return os.difftime(os.time(newdatetable),os.time(olddatetable))
	-- Return currdate, olddate, datediff
	return os.time(newdatetable), os.time(olddatetable), os.difftime(os.time(newdatetable),os.time(olddatetable))
end
local function minmax_date ( userdate )
	local maxdate = 0
	local mindate = 0
	local f,err = io.popen("date +%Y ")
	currdate = f:read("*l")
	f:close()
	local year,month,date,hour,min,sec = string.gmatch ( currdate, "(%d%d%d%d)%s+(%w+)%s+(%d%d)" )
--	local month = rawget(systemdate,2)
--	local newdatetable = { year = rawget(systemdate,6), month = nummonth, day = rawget(systemdate,3), hour = hour, min = min, sec = sec }

--	return os.difftime(os.time(newdatetable),os.time(olddatetable))
	-- Return currdate, olddate, datediff
	return os.time(userdate[2])
end

-- ################################################################################
-- PUBLIC FUNCTIONS

function clientlist( self, path )
	local clientlist = {}
	local routinglist = {}
	local datechange = {}
	local list = {}
	local f = ""
	local clientlst = nil
	local routinglst = nil
	local strsplit = require("split")
	if ( path ) then
		config = config_content ( path )
	end
	if (config.status) then
		local f = fs.read_file_as_array( config.status )
		if ( f ) then
			for k,v in ipairs(f) do
				local col = strsplit(",", v)
				if ( col[1] == "ROUTING TABLE" ) then
					clientlst = nil
				end

				if ( clientlst ) then
					table.insert(clientlist, { CN=col[1],
						REALADDR=col[2],
						BYTESRCV=col[3],
						BYTESSND=col[4],
						CONN=col[5] } )
				end
				if ( routinglst ) then
					table.insert(routinglist, { VIRTADDR=col[1],
						CN=col[2],
						REALADDR=col[3],
						LAST=col[4] } )
					table.insert(datechange, { year="2007",
						month=monthabbr_to_num("may"),
						day="10",
						hour="15",
						min="12",
						sec="13" } )
				end

				if ( col[1] == "Common Name" ) then
					clientlst = "YES"
				end
				if ( col[1] == "ROUTING TABLE" ) then
					routinglst = "YES"
				end
				if ( col[1] == "GLOBAL STATS" ) then
					routinglst = nil
				end
			end
		end
	end
	-- JOIN 'CLIENT_LIST' and 'ROUTING_LIST' TABLES INTO ONE TABLE
	for k,v in ipairs(clientlist) do
		for kk,vv in ipairs(routinglist) do
			if ( v.CN == vv.CN ) then
				local maxdatesec, mindatesec = minmax_date(datechange)
				table.insert(list, { CN=v.CN, REALADDR=v.REALADDR, BYTESRCV=v.BYTESRCV, BYTESSND=v.BYTESSND, VIRTADDR=vv.VIRTADDR, CONN=v.CONN, LAST = LAST } )
			end
		end
	end
	local connclients = table.maxn(list)
	local difftime = maxdatesec
	-- FIXME: This should probably be modifiead and go into a library!!!
	return list, connclients, difftime
end


function clientlistWORKING( self, path )
	-- DEBUG
--	local path = "openvpn.conf"
	local clientlist = {}
	local f = ""
	local f2 = ""
	if ( path ) then
--		config = config_content ( config.name )
--		config = {}		
		config = config_content ( path )
	end
	if (config.status) then
		local f = fs.read_file_as_array( config.status )
		if ( f ) then
			for k,v in ipairs(f) do
				-- The reason for this compex regexp is that I want to filter away the first 2-3 rows
				-- that doesn't mach this regexp.
		 		local clientname,clientip,clientport,bytesreceived,bytessent = string.match ( v, "([^,]*)[,]+([%w]+[.*][%w]+[.*][%w]+[.*][%w]+)[:]([%w]+)[,](%w*)[,](%w*)" )
				-- Routing table is now intresting at this moment. So stop reading file.
				if ( v == "ROUTING TABLE" ) then 
					break
				end
				if ( clientname ~= nil ) then
					table.insert ( clientlist, cfe{ name = clientname, ip = clientip , virtualip = "xXx.xXx.xXx.xXx", port = clientport, received = bytesreceived, sent = bytessent } )
				end
			end
		end
	end
	local connclients = table.maxn(clientlist)
	return clientlist, connclients
end

function openvpn_version()
	local f,error = io.popen("/usr/sbin/openvpn --version")
	openvpnversion = f:read("*l")
	f:close()
	if not (openvpnversion) then
		openvpnversion = "Not installed!"
	end
	return openvpnversion
end

function get_serverconfig ( self, f )
	local serverconfig = {}
	config = config_content ( f )
	-- FIXME: change nex row to clientlist(config.name)
	local clientlist, connclients, lastupdate = clientlist ()
	local isrunning = is_running ("openvpn", f)
--	local isrunning = f
	-- FIXME: Get status for autostart_status = 'rc_status | grep this process'
	local autostart_status = ""
	serverconfig = cfe{ name = f, device = config.dev, log = config.log, verb = config.verb, maxclients = config["max-clients"], clients = connclients, status = isrunning, autostart = autostart_status, dh = config.dh, ca = config.ca, cert = config.cert, key = config.key, tls = config["tls-auth"] , crl = config["crl-verify"], port = config.port, proto = config.proto, loca = config["local"], longname = config.name, lastupdate = lastupdate, remote = config.remote }
	return serverconfig
end

function get_logfile( self, path)
	local logcontent = {}
	config = config_content ( path )
	local logfilecontent = fs.read_file ( config.log )
	if not (logfilecontent) then
		logfilecontent = "File is empty or missing!"
	end
	return ( { name = config.log, value = logfilecontent } )
end

function get_config( self, path)
	local logcontent = {}
	config = config_content ( path )
	local logfilecontent = fs.read_file ( config.name )
	if not (logfilecontent) then
		logfilecontent = "File is empty or missing!"
	end
	return ( { name = config.name, shortname = path, value = logfilecontent } )
end


function get_conflist ()
	local configlist = {}
	for k,v in pairs(list_conffiles()) do
		config = config_content ( v.name )
		local conf_type, err = check_valid_config ( v.name )
		local isrunning = is_running ("openvpn", v.name)
		local clientlist, connclients = clientlist ()
		table.insert ( configlist, cfe{ name = v.name, type = conf_type, test = config.ca, err = err, status = isrunning, clients = connclients } )
	end
	local countconfigs = table.maxn(configlist)
	return configlist, countconfigs
end
get = function (self)
	return list_conffiles()
end