luci/applications/luci-splash/root/usr/sbin/luci-splash

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#!/usr/bin/lua
require("luci.util")
require("luci.model.uci")
require("luci.sys.iptparser")
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-- Init state session
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local uci = luci.model.uci.cursor_state()
local ipt = luci.sys.iptparser.IptParser()
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function main(argv)
local cmd = argv[1]
local arg = argv[2]
if cmd == "status" and arg then
if islisted("whitelist", arg) then
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print("whitelisted")
elseif islisted("blacklist", arg) then
print("blacklisted")
else
local lease = haslease(arg)
if lease and lease.kicked then
print("kicked")
elseif lease then
print("lease")
else
print("unknown")
end
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end
os.exit(0)
elseif cmd == "add" and arg then
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if not haslease(arg) then
add_lease(arg)
else
print("already leased!")
os.exit(2)
end
os.exit(0)
elseif cmd == "remove" and arg then
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remove_lease(arg)
os.exit(0)
elseif cmd == "sync" then
sync()
os.exit(0)
else
print("Usage: " .. argv[0] .. " <status|add|remove|sync> [MAC]")
os.exit(1)
end
end
-- Add a lease to state and invoke add_rule
function add_lease(mac)
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uci:section("luci_splash", "lease", nil, {
mac = mac,
start = os.time()
})
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add_rule(mac)
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uci:save("luci_splash")
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end
-- Remove a lease from state and invoke remove_rule
function remove_lease(mac)
mac = mac:lower()
remove_rule(mac)
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uci:delete_all("luci_splash", "lease",
function(s) return ( s.mac:lower() == mac ) end)
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uci:save("luci_splash")
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end
-- Add an iptables rule
function add_rule(mac)
os.execute("iptables -I luci_splash_counter -m mac --mac-source '"..mac.."' -j RETURN")
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return os.execute("iptables -t nat -I luci_splash_leases -m mac --mac-source '"..mac.."' -j RETURN")
end
-- Remove an iptables rule
function remove_rule(mac)
for _, r in ipairs(ipt:find({table="filter", chain="luci_splash_counter"})) do
if r.options and #r.options >= 2 and r.options[1] == "MAC" and
r.options[2]:lower() == mac:lower()
then
os.execute("iptables -D luci_splash_counter -m mac --mac-source %q -j %s"
%{ mac, r.target })
end
end
for _, r in ipairs(ipt:find({table="nat", chain="luci_splash_leases"})) do
if r.options and #r.options >= 2 and r.options[1] == "MAC" and
r.options[2]:lower() == mac:lower()
then
os.execute("iptables -t nat -D luci_splash_leases -m mac --mac-source %q -j %s"
%{ mac, r.target })
end
end
ipt:resync()
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end
-- Check whether a MAC-Address is listed in the lease state list
function haslease(mac)
mac = mac:lower()
local lease = nil
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uci:foreach("luci_splash", "lease",
function (section)
if section.mac:lower() == mac then
lease = section
end
end)
return lease
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end
-- Check whether a MAC-Address is in given list
function islisted(what, mac)
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mac = mac:lower()
uci:foreach("luci_splash", what,
function (section)
if section.mac:lower() == mac then
stat = true
return
end
end)
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return false
end
-- Returns a list of MAC-Addresses for which a rule is existing
function listrules()
local macs = { }
for i, r in ipairs(ipt:find({table="nat", chain="luci_splash_leases"})) do
if r.options and #r.options >= 2 and r.options[1] == "MAC" then
macs[r.options[2]:lower()] = true
end
end
return luci.util.keys(macs)
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end
-- Synchronise leases, remove abandoned rules
function sync()
local written = {}
local time = os.time()
-- Current leases in state files
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local leases = uci:get_all("luci_splash")
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-- Convert leasetime to seconds
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local leasetime = tonumber(uci:get("luci_splash", "general", "leasetime")) * 3600
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-- Clean state file
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uci:load("luci_splash")
uci:revert("luci_splash")
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-- For all leases
for k, v in pairs(leases) do
if v[".type"] == "lease" then
if os.difftime(time, tonumber(v.start)) > leasetime then
-- Remove expired
remove_rule(v.mac)
else
-- Rewrite state
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uci:section("luci_splash", "lease", nil, {
mac = v.mac,
start = v.start,
kicked = v.kicked
})
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written[v.mac:lower()] = 1
end
elseif v[".type"] == "whitelist" or v[".type"] == "blacklist" then
written[v.mac:lower()] = 1
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end
end
-- Delete rules without state
for i, r in ipairs(listrules()) do
if #r > 0 and not written[r:lower()] then
remove_rule(r)
end
end
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uci:save("luci_splash")
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end
main(arg)