module (..., package.seeall)

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

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

-- ################################################################################
-- 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*).*$" )	-- Working exept on 'remote xxxxx xxxx'
			-- FIXME: Problem with clients 'remote' values (the port num to the remote)
--			local a,b = string.match ( l, "^%s*(%S*)%s+(.*)%s+$" )	-- 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()
	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
	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

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

function clientlist( self, path )
	local libdate = require("date")
	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" ) or ( col[1] == "GLOBAL STATS" ) then
					clientlst = nil
					routinglst = 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] } )
					if (col[4]) then
						local month,day,hour,min,sec,year = string.match(col[4],"^%S+%s+(%S+)%s+(%S+)%s+(%d%d):(%d%d):(%d%d)%s+(%S+)")
						table.insert(datechange, { year=year,
							month=libdate.abr_month_num(month),
							day=day,
							hour=hour,
							min=min,
							sec=sec } )
					end
				end
				if ( col[1] == "Virtual Address" ) then
					routinglst = "YES"
				end
				if ( col[1] == "Common Name" ) then
					clientlst = "YES"
				end

			end
		end
	end
	-- JOIN 'CLIENT_LIST' and 'ROUTING_LIST' TABLES INTO ONE TABLE AND LATER ON PRESENT THIS TABLE
	for k,v in ipairs(clientlist) do
		for kk,vv in ipairs(routinglist) do
			if ( v.CN == vv.CN ) then
				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
	connclients = table.maxn(list)
	if ( connclients > 0 ) then
		-- FIXME: If possible, use lib/date.lua instead of the following code.
		local lastdatechange = libdate.date_to_seconds(datechange)
		lastdatechangetxt = os.date("%c", lastdatechange[#lastdatechange])
		lastdatechangediff = os.time() - os.date(lastdatechange[table.maxn(lastdatechange)])
		if (lastdatechangediff > 60) then
			lastdatechangediff = math.modf(lastdatechangediff / 60) .. " min"
		else
			lastdatechangediff = lastdatechangediff  .. " sec"
		end
	end
	return list, connclients, lastdatechangetxt, lastdatechangediff
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 )
	local clientlist, connclients, lastupdate, lastdatechangediff = clientlist ()
	local isrunning = is_running ("openvpn", f)
	serverconfig = cfe{ name = f, device = config.dev, log = config.log, verb = config.verb, maxclients = config["max-clients"], clients = connclients, status = isrunning, 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, lastdatechangetxt = lastdatechangetxt, lastdatechangediff = lastdatechangediff, 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