--[[
LuCI - Lua Configuration Interface

Copyright 2008 Steven Barth <steven@midlink.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

$Id$
]]--

local nw = require "luci.model.network"
local fw = require "luci.model.firewall"
local utl = require "luci.util"
local dsp = require "luci.dispatcher"

local has_v2 = nixio.fs.access("/lib/firewall/fw.sh")
local out, inp

require("luci.tools.webadmin")
m = Map("firewall", translate("Firewall - Zone Settings"))
m.redirect = luci.dispatcher.build_url("admin/network/firewall")

fw.init(m.uci)
nw.init(m.uci)


local zone = fw:get_zone(arg[1])
if not zone then
	luci.http.redirect(dsp.build_url("admin", "network", "firewall"))
	return
end


s = m:section(NamedSection, zone.sid, "zone",
	translatef("Zone %q", zone:name()),
	translatef("This section defines common properties of %q. " ..
		"The <em>input</em> and <em>output</em> options set the default "..
		"policies for traffic entering and leaving this zone while the " ..
		"<em>forward</em> option describes the policy for forwarded traffic " ..
		"between different networks within the zone. " ..
		"<em>Covered networks</em> specifies which available networks are " ..
		"member of this zone.", zone:name()))

s.anonymous = true
s.addremove = false

m.on_commit = function(map)
	local zone = fw:get_zone(arg[1])
	if zone then
		s.section  = zone.sid
		s2.section = zone.sid
	end
end


s:tab("general", translate("General Settings"))
s:tab("advanced", translate("Advanced Settings"))


name = s:taboption("general", Value, "name", translate("Name"))
name.optional = false
name.forcewrite = true
name.datatype = "uciname"

function name.write(self, section, value)
	if zone:name() ~= value then
		fw:rename_zone(zone:name(), value)
		out.exclude = value
		inp.exclude = value
	end

	m.redirect = luci.dispatcher.build_url(
		"admin", "network", "firewall", "zones", value
	)
end

p = {}
p[1] = s:taboption("general", ListValue, "input", translate("Input"))
p[2] = s:taboption("general", ListValue, "output", translate("Output"))
p[3] = s:taboption("general", ListValue, "forward", translate("Forward"))

for i, v in ipairs(p) do
	v:value("REJECT", translate("reject"))
	v:value("DROP", translate("drop"))
	v:value("ACCEPT", translate("accept"))
end

s:taboption("general", Flag, "masq", translate("Masquerading"))
s:taboption("general", Flag, "mtu_fix", translate("MSS clamping"))

net = s:taboption("general", Value, "network", translate("Covered networks"))
net.template = "cbi/network_netlist"
net.widget = "checkbox"
net.cast = "string"

function net.formvalue(self, section)
	return Value.formvalue(self, section) or "-"
end

function net.cfgvalue(self, section)
	return Value.cfgvalue(self, section) or name:cfgvalue(section)
end

function net.write(self, section, value)
	zone:clear_networks()

	local n
	for n in utl.imatch(value) do
		zone:add_network(n)
	end
end


if has_v2 then
	family = s:taboption("advanced", ListValue, "family",
		translate("Restrict to address family"))

	family.rmempty = true
	family:value("", translate("IPv4 and IPv6"))
	family:value("ipv4", translate("IPv4 only"))
	family:value("ipv6", translate("IPv6 only"))
end

msrc = s:taboption("advanced", DynamicList, "masq_src",
	translate("Restrict Masquerading to given source subnets"))

msrc.optional = true
msrc.datatype = "ip4addr"
msrc.placeholder = "0.0.0.0/0"
msrc:depends("family", "")
msrc:depends("family", "ipv4")

mdest = s:taboption("advanced", DynamicList, "masq_dest",
	translate("Restrict Masquerading to given destination subnets"))

mdest.optional = true
mdest.datatype = "ip4addr"
mdest.placeholder = "0.0.0.0/0"
mdest:depends("family", "")
mdest:depends("family", "ipv4")

s:taboption("advanced", Flag, "conntrack",
	translate("Force connection tracking"))

if has_v2 then
	log = s:taboption("advanced", Flag, "log",
		translate("Enable logging on this zone"))

	log.rmempty = true
	log.enabled = "1"

	lim = s:taboption("advanced", Value, "log_limit",
		translate("Limit log messages"))

	lim.placeholder = "10/minute"
	lim:depends("log", "1")
end


s2 = m:section(NamedSection, zone.sid, "fwd_out",
	translate("Inter-Zone Forwarding"),
	translatef("The options below control the forwarding policies between " ..
		"this zone (%s) and other zones. <em>Destination zones</em> cover " ..
		"forwarded traffic <strong>originating from %q</strong>. " ..
		"<em>Source zones</em> match forwarded traffic from other zones " ..
		"<strong>targeted at %q</strong>. The forwarding rule is " ..
		"<em>unidirectional</em>, e.g. a forward from lan to wan does " ..
		"<em>not</em> imply a permission to forward from wan to lan as well.",
		zone:name(), zone:name(), zone:name()

	))

out = s2:option(Value, "out",
	translate("Allow forward to <em>destination zones</em>:"))

out.nocreate = true
out.widget = "checkbox"
out.exclude = zone:name()
out.template = "cbi/firewall_zonelist"

inp = s2:option(Value, "in",
	translate("Allow forward from <em>source zones</em>:"))

inp.nocreate = true
inp.widget = "checkbox"
inp.exclude = zone:name()
inp.template = "cbi/firewall_zonelist"

function out.cfgvalue(self, section)
	local v = { }
	local f
	for _, f in ipairs(zone:get_forwardings_by("src")) do
		v[#v+1] = f:dest()
	end
	return table.concat(v, " ")
end

function inp.cfgvalue(self, section)
	local v = { }
	local f
	for _, f in ipairs(zone:get_forwardings_by("dest")) do
		v[#v+1] = f:src()
	end
	return v
end

function out.formvalue(self, section)
	return Value.formvalue(self, section) or "-"
end

function inp.formvalue(self, section)
	return Value.formvalue(self, section) or "-"
end

function out.write(self, section, value)
	zone:del_forwardings_by("src")

	local f
	for f in utl.imatch(value) do
		zone:add_forwarding_to(f)
	end
end

function inp.write(self, section, value)
	zone:del_forwardings_by("dest")

	local f
	for f in utl.imatch(value) do
		zone:add_forwarding_from(f)
	end
end

return m