Rework LuCI build system
[project/luci.git] / applications / luci-app-splash / root / usr / sbin / luci-splash
diff --git a/applications/luci-app-splash/root/usr/sbin/luci-splash b/applications/luci-app-splash/root/usr/sbin/luci-splash
new file mode 100755 (executable)
index 0000000..6b1e41e
--- /dev/null
@@ -0,0 +1,751 @@
+#!/usr/bin/lua
+
+utl = require "luci.util"
+sys = require "luci.sys"
+
+require("luci.model.uci")
+require("luci.sys.iptparser")
+
+-- Init state session
+local uci = luci.model.uci.cursor_state()
+local ipt = luci.sys.iptparser.IptParser()
+local net = sys.net
+local fs = require "luci.fs"
+local ip = require "luci.ip"
+
+local debug = false
+
+local has_ipv6 = fs.access("/proc/net/ipv6_route") and fs.access("/usr/sbin/ip6tables")
+
+function exec(cmd)
+       -- executes a cmd and gets its output
+       if debug then
+               local ret = sys.exec(cmd)
+               print('+ ' .. cmd)
+               if ret and ret ~= "" then
+                       print(ret)
+               end
+       else
+               local ret = sys.exec(cmd .. " &> /dev/null")
+       end
+end
+
+function call(cmd)
+       -- just calls a command
+       if debug then
+               print('+ ' .. cmd)
+       end
+       os.execute(cmd)
+end
+
+
+function lock()
+       call("lock /var/run/luci_splash.lock")
+end
+
+function unlock()
+       call("lock -u /var/run/luci_splash.lock")
+end
+
+function get_id(ip)
+       local o3, o4 = ip:match("[0-9]+%.[0-9]+%.([0-9]+)%.([0-9]+)")
+       if o3 and 04 then
+               return string.format("%02X%s", tonumber(o3), "") .. string.format("%02X%s", tonumber(o4), "")
+       else
+               return false
+       end
+end
+
+function update_stats(leased, whitelisted, whitelisttotal, blacklisted, blacklisttotal)
+       local leases = uci:get_all("luci_splash_leases", "stats")
+       uci:delete("luci_splash_leases", "stats")
+       uci:section("luci_splash_leases", "stats", "stats", {
+               leases    = leased or (leases and leases.leases) or 0,
+               whitelisttotal = whitelisttotal or (leased and leases.whitelisttotal) or 0,
+               whitelistonline = whitelisted or (leases and leases.whitelistonline) or 0,
+               blacklisttotal = blacklisttotal or (leases and leases.blacklisttotal) or 0,
+               blacklistonline = blacklisted or (leases and leases.blacklistonline) or 0,
+       })
+       uci:save("luci_splash_leases")
+end
+
+
+function get_device_for_ip(ipaddr)
+       local dev
+       uci:foreach("network", "interface", function(s)
+               if s.ipaddr and s.netmask then
+                       local network = ip.IPv4(s.ipaddr, s.netmask)
+                       if network:contains(ip.IPv4(ipaddr)) then
+                               -- this should be rewritten to luci functions if possible
+                               dev = utl.trim(sys.exec(". /lib/functions/network.sh; network_get_device IFNAME '" ..  s['.name'] .. "'; echo $IFNAME"))
+                       end
+               end
+       end)
+       return dev
+end
+
+function get_physdev(interface)
+       local dev
+       dev = utl.trim(sys.exec(". /lib/functions/network.sh; network_get_device IFNAME '" ..  interface .. "'; echo $IFNAME"))
+       return dev
+end
+
+
+
+function get_filter_handle(parent, direction, device, mac)
+       local input = utl.split(sys.exec('/usr/sbin/tc filter show dev ' .. device .. ' parent ' .. parent) or {})
+       local tbl = {}
+       local handle
+       for k, v in pairs(input) do
+               handle = v:match('filter protocol ip pref %d+ u32 fh (%d*:%d*:%d*) order') or v:match('filter protocol all pref %d+ u32 fh (%d*:%d*:%d*) order')
+               if handle then
+                       local mac, mac1, mac2, mac3, mac4, mac5, mac6
+                       if direction == 'src' then
+                               mac1, mac2, mac3, mac4 = input[k+1]:match('match ([%a%d][%a%d])([%a%d][%a%d])([%a%d][%a%d])([%a%d][%a%d])/ffffffff')
+                               mac5, mac6 = input[k+2]:match('match ([%a%d][%a%d])([%a%d][%a%d])0000/ffff0000')
+                       else
+                               mac1, mac2 = input[k+1]:match('match 0000([%a%d][%a%d])([%a%d][%a%d])/0000ffff')
+                               mac3, mac4, mac5, mac6 = input[k+2]:match('match ([%a%d][%a%d])([%a%d][%a%d])([%a%d][%a%d])([%a%d][%a%d])/ffffffff')
+                       end
+                       if mac1 and mac2 and mac3 and mac4 and mac5 and mac6 then
+                               mac = "%s:%s:%s:%s:%s:%s" % { mac1, mac2, mac3, mac4, mac5, mac6 }
+                               tbl[mac] = handle
+                       end
+               end
+       end
+       if tbl[mac] then
+               handle = tbl[mac]
+       end
+       return handle
+end
+
+function macvalid(mac)
+       if mac and mac:match(
+               "^[a-fA-F0-9][a-fA-F0-9]:[a-fA-F0-9][a-fA-F0-9]:" ..
+               "[a-fA-F0-9][a-fA-F0-9]:[a-fA-F0-9][a-fA-F0-9]:" ..
+               "[a-fA-F0-9][a-fA-F0-9]:[a-fA-F0-9][a-fA-F0-9]$"
+       ) then
+               return true
+       end
+
+       return false
+end
+
+function ipvalid(ipaddr)
+       if ipaddr then
+               return ip.IPv4(ipaddr) and true or false
+       end
+
+       return false
+end
+
+function main(argv)
+       local cmd = table.remove(argv, 1)
+       local arg = argv[1]
+
+       limit_up = (tonumber(uci:get("luci_splash", "general", "limit_up")) or 0) * 8
+       limit_down = (tonumber(uci:get("luci_splash", "general", "limit_down")) or 0) * 8
+
+       if ( cmd == "lease" or cmd == "add-rules" or cmd == "remove" or
+            cmd == "whitelist" or cmd == "blacklist" or cmd == "status" ) and #argv > 0
+       then
+               if not (macvalid(arg) or ipvalid(arg)) then
+                       print("Invalid argument. The second argument must " ..
+                               "be a valid IPv4 or Mac Address.")
+                       os.exit(1)
+               end
+
+               lock()
+
+               local arp_cache      = net.arptable()
+               local leased_macs    = get_known_macs("lease")
+               local blacklist_macs = get_known_macs("blacklist")
+               local whitelist_macs = get_known_macs("whitelist")
+
+               for i, adr in ipairs(argv) do
+                       local mac = nil
+                       if adr:find(":") then
+                               mac = adr:lower()
+                       else
+                               for _, e in ipairs(arp_cache) do
+                                       if e["IP address"] == adr then
+                                               mac = e["HW address"]:lower()
+                                               break
+                                       end
+                               end
+                       end
+
+                       if mac and cmd == "add-rules" then
+                               if leased_macs[mac] then
+                                       add_lease(mac, arp_cache, true)
+                               elseif blacklist_macs[mac] then
+                                       add_blacklist_rule(mac)
+                               elseif whitelist_macs[mac] then
+                                       add_whitelist_rule(mac)
+                               end
+                       elseif mac and cmd == "status" then
+                               print(leased_macs[mac] and "lease"
+                                       or whitelist_macs[mac] and "whitelist"
+                                       or blacklist_macs[mac] and "blacklist"
+                                       or "new")
+                       elseif mac and ( cmd == "whitelist" or cmd == "blacklist" or cmd == "lease" ) then
+                               if cmd ~= "lease" and leased_macs[mac] then
+                                       print("Removing %s from leases" % mac)
+                                       remove_lease(mac)
+                                       leased_macs[mac] = nil
+                               end
+
+                               if cmd ~= "whitelist" and whitelist_macs[mac] then
+                                       if cmd == "lease" then
+                                               print('%s is whitelisted. Remove it before you can lease it.' % mac)
+                                       else
+                                               print("Removing %s from whitelist" % mac)
+                                               remove_whitelist(mac)
+                                               whitelist_macs[mac] = nil
+                                       end
+                               end
+
+                               if cmd == "whitelist" and leased_macs[mac] then
+                                       print("Removing %s from leases" % mac)
+                                       remove_lease(mac)
+                                       leased_macs[mac] = nil
+                               end
+
+                               if cmd ~= "blacklist" and blacklist_macs[mac] then
+                                       print("Removing %s from blacklist" % mac)
+                                       remove_blacklist(mac)
+                                       blacklist_macs[mac] = nil
+                               end
+
+                               if cmd == "lease" and not leased_macs[mac] then
+                                       if not whitelist_macs[mac] then
+                                               print("Adding %s to leases" % mac)
+                                               add_lease(mac)
+                                               leased_macs[mac] = true
+                                       end
+                               elseif cmd == "whitelist" and not whitelist_macs[mac] then
+                                       print("Adding %s to whitelist" % mac)
+                                       add_whitelist(mac)
+                                       whitelist_macs[mac] = true
+                               elseif cmd == "blacklist" and not blacklist_macs[mac] then
+                                       print("Adding %s to blacklist" % mac)
+                                       add_blacklist(mac)
+                                       blacklist_macs[mac] = true
+                               else
+                                       print("The mac %s is already %sed" %{ mac, cmd })
+                               end
+                       elseif mac and cmd == "remove" then
+                               if leased_macs[mac] then
+                                       print("Removing %s from leases" % mac)
+                                       remove_lease(mac)
+                                       leased_macs[mac] = nil
+                               elseif whitelist_macs[mac] then
+                                       print("Removing %s from whitelist" % mac)
+                                       remove_whitelist(mac)
+                                       whitelist_macs[mac] = nil                                       
+                               elseif blacklist_macs[mac] then
+                                       print("Removing %s from blacklist" % mac)
+                                       remove_blacklist(mac)
+                                       blacklist_macs[mac] = nil
+                               else
+                                       print("The mac %s is not known" % mac)
+                               end
+
+                       else
+                               print("Can not find mac for ip %s" % argv[i])
+                       end
+               end
+               unlock()
+               os.exit(0)
+       elseif cmd == "sync" then
+               sync()
+               os.exit(0)
+       elseif cmd == "list" then
+               list()
+               os.exit(0)
+       else
+               print("Usage:")
+               print("\n  luci-splash list\n    List connected, black- and whitelisted clients")
+               print("\n  luci-splash sync\n    Synchronize firewall rules and clear expired leases")
+               print("\n  luci-splash lease <MAC-or-IP>\n    Create a lease for the given address")
+               print("\n  luci-splash blacklist <MAC-or-IP>\n    Add given address to blacklist")
+               print("\n  luci-splash whitelist <MAC-or-IP>\n    Add given address to whitelist")
+               print("\n  luci-splash remove <MAC-or-IP>\n    Remove given address from the lease-, black- or whitelist")
+               print("")
+
+               os.exit(1)      
+       end
+end
+
+-- Get current arp cache
+function get_arpcache()
+       local arpcache = { }
+       for _, entry in ipairs(net.arptable()) do
+               arpcache[entry["HW address"]:lower()] = { entry["Device"]:lower(), entry["IP address"]:lower() }
+       end
+       return arpcache
+end
+
+-- Get a list of known mac addresses
+function get_known_macs(list)
+       local leased_macs = { }
+
+       if not list or list == "lease" then
+               uci:foreach("luci_splash_leases", "lease", function(s)
+                       if s.mac then
+                               leased_macs[s.mac:lower()] = true
+                       end
+               end)
+       end
+
+       if not list or list == "whitelist" then
+               uci:foreach("luci_splash", "whitelist", function(s)
+                       if s.mac then
+                               leased_macs[s.mac:lower()] = true
+                       end
+               end)
+       end
+
+       if not list or list == "blacklist" then
+               uci:foreach("luci_splash", "blacklist", function(s)
+                       if s.mac then
+                               leased_macs[s.mac:lower()] = true
+                       end
+               end)
+       end
+       return leased_macs
+end
+
+
+-- Helper to delete iptables rules
+function ipt_delete_all(args, comp, off)
+       off = off or { }
+       for i, r in ipairs(ipt:find(args)) do
+               if comp == nil or comp(r) then
+                       off[r.table] = off[r.table] or { }
+                       off[r.table][r.chain] = off[r.table][r.chain] or 0
+
+                       exec("iptables -t %q -D %q %d 2>/dev/null"
+                               %{ r.table, r.chain, r.index - off[r.table][r.chain] })
+
+                       off[r.table][r.chain] = off[r.table][r.chain] + 1
+               end
+       end
+end
+
+function ipt6_delete_all(args, comp, off)
+       off = off or { }
+       for i, r in ipairs(ipt:find(args)) do
+               if comp == nil or comp(r) then
+                       off[r.table] = off[r.table] or { }
+                       off[r.table][r.chain] = off[r.table][r.chain] or 0
+
+                       exec("ip6tables -t %q -D %q %d 2>/dev/null"
+                               %{ r.table, r.chain, r.index - off[r.table][r.chain] })
+
+                       off[r.table][r.chain] = off[r.table][r.chain] + 1
+               end
+       end
+end
+
+
+-- Convert mac to uci-compatible section name
+function convert_mac_to_secname(mac)
+       return string.gsub(mac, ":", "")
+end
+
+-- Add a lease to state and invoke add_rule
+function add_lease(mac, arp, no_uci)
+       mac = mac:lower()
+
+       -- Get current ip address
+       local ipaddr
+       for _, entry in ipairs(arp or net.arptable()) do
+               if entry["HW address"]:lower() == mac then
+                       ipaddr = entry["IP address"]
+                       break
+               end
+       end
+
+       -- Add lease if there is an ip addr
+       if ipaddr then
+               local device = get_device_for_ip(ipaddr)
+               if not no_uci then
+                       local leased = uci:get("luci_splash_leases", "stats", "leases")
+                       if type(tonumber(leased)) == "number" then
+                               update_stats(leased + 1, nil, nil, nil, nil)
+                       end
+
+                       uci:section("luci_splash_leases", "lease", convert_mac_to_secname(mac), {
+                               mac    = mac,
+                               ipaddr = ipaddr,
+                               device = device,
+                               limit_up = limit_up,
+                               limit_down = limit_down,
+                               start  = os.time()
+                       })
+                       uci:save("luci_splash_leases")
+               end
+               add_lease_rule(mac, ipaddr, device)
+       else
+               print("Found no active IP for %s, lease not added" % mac)
+       end
+end
+
+
+-- Remove a lease from state and invoke remove_rule
+function remove_lease(mac)
+       mac = mac:lower()
+
+       uci:delete_all("luci_splash_leases", "lease",
+               function(s)
+                       if s.mac:lower() == mac then
+
+                               local leased = uci:get("luci_splash_leases", "stats", "leases")
+                               if type(tonumber(leased)) == "number" and tonumber(leased) > 0 then
+                                       update_stats(leased - 1, nil, nil, nil, nil)
+                               end
+                               remove_lease_rule(mac, s.ipaddr, s.device, tonumber(s.limit_up), tonumber(s.limit_down))
+                               return true
+                       end
+                       return false
+               end)
+
+       uci:save("luci_splash_leases")
+end
+
+
+-- Add a whitelist entry
+function add_whitelist(mac)
+       uci:section("luci_splash", "whitelist", convert_mac_to_secname(mac), { mac = mac })
+       uci:save("luci_splash")
+       uci:commit("luci_splash")
+       add_whitelist_rule(mac)
+end
+
+
+-- Add a blacklist entry
+function add_blacklist(mac)
+       uci:section("luci_splash", "blacklist", convert_mac_to_secname(mac), { mac = mac })
+       uci:save("luci_splash")
+       uci:commit("luci_splash")
+       add_blacklist_rule(mac)
+end
+
+
+-- Remove a whitelist entry
+function remove_whitelist(mac)
+       mac = mac:lower()
+       uci:delete_all("luci_splash", "whitelist",
+               function(s) return not s.mac or s.mac:lower() == mac end)
+       uci:save("luci_splash")
+       uci:commit("luci_splash")
+       remove_lease_rule(mac)
+       remove_whitelist_tc(mac)
+end
+
+function remove_whitelist_tc(mac)
+        uci:foreach("luci_splash", "iface", function(s)
+               local device = get_physdev(s['.name'])
+               if device and device ~= "" then
+                       if debug then
+                               print("Removing whitelist filters for %s interface %s." % {mac, device})
+                       end
+                       local handle = get_filter_handle('ffff:', 'src', device, mac)
+                       if handle then
+                               exec('tc filter del dev "%s" parent ffff: protocol ip prio 1 handle %s u32' % { device, handle })
+                       else
+                               print('Warning! Could not get a handle for %s parent :ffff on interface %s' % { mac, device })
+                       end
+                       local handle = get_filter_handle('1:', 'dest', device, mac)
+                       if handle then
+                               exec('tc filter del dev "%s" parent 1:0 protocol ip prio 1 handle %s u32' % { device, handle })
+                       else
+                               print('Warning! Could not get a handle for %s parent 1:0 on interface %s' % { mac, device })
+                       end
+               end
+        end)
+end
+
+-- Remove a blacklist entry
+function remove_blacklist(mac)
+       mac = mac:lower()
+       uci:delete_all("luci_splash", "blacklist",
+               function(s) return not s.mac or s.mac:lower() == mac end)
+       uci:save("luci_splash")
+       uci:commit("luci_splash")
+       remove_lease_rule(mac)
+end
+
+
+-- Add an iptables rule
+function add_lease_rule(mac, ipaddr, device)
+       local id
+       if ipaddr then
+               id = get_id(ipaddr)
+       end
+
+       exec("iptables -t mangle -I luci_splash_mark_out -m mac --mac-source %q -j RETURN" % mac)
+
+       -- Mark incoming packets to a splashed host
+       -- for ipv4 - by iptables and destination
+       if id and device then
+               exec("iptables -t mangle -I luci_splash_mark_in -d %q -j MARK --set-mark 0x1%s -m comment --comment %s" % {ipaddr, id, mac:upper()})
+       end
+
+       --for ipv6: need to use the mac here
+
+       if has_ipv6 then
+               exec("ip6tables -t mangle -I luci_splash_mark_out -m mac --mac-source %q -j MARK --set-mark 79" % mac)
+               if id and device and tonumber(limit_down) then
+                       exec("tc filter add dev %s parent 1:0 protocol ipv6 prio 1 u32 match ether dst %s classid 1:%s" % {device, mac:lower(), id})
+               end
+       end
+
+
+       if device and tonumber(limit_up) > 0 then
+               exec('tc filter add dev "%s" parent ffff: protocol all prio 2 u32 match ether src %s police rate %skbit mtu 6k burst 6k drop' % {device, mac, limit_up})
+       end
+
+       if id and device and tonumber(limit_down) > 0 then
+               exec("tc class add dev %s parent 1: classid 1:0x%s htb rate %skbit" % { device, id, limit_down })
+               exec("tc qdisc add dev %s parent 1:%s sfq perturb 10" % { device, id })
+       end
+
+       exec("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
+       exec("iptables -t nat    -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
+       if has_ipv6 then
+               exec("ip6tables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
+       end
+end
+
+
+-- Remove lease, black- or whitelist rules
+function remove_lease_rule(mac, ipaddr, device, limit_up, limit_down)
+
+       local id
+       if ipaddr then
+               id = get_id(ipaddr)
+       end
+
+       ipt:resync()
+       ipt_delete_all({table="mangle", chain="luci_splash_mark_in", options={"/*", mac:upper()}})
+       ipt_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", mac:upper()}})
+       ipt_delete_all({table="filter", chain="luci_splash_filter",   options={"MAC", mac:upper()}})
+       ipt_delete_all({table="nat",    chain="luci_splash_leases",   options={"MAC", mac:upper()}})
+       if has_ipv6 then
+               ipt6_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", mac:upper()}})
+               ipt6_delete_all({table="filter", chain="luci_splash_filter",   options={"MAC", mac:upper()}})
+       end
+
+       if device and tonumber(limit_up) > 0 then
+               local handle = get_filter_handle('ffff:', 'src', device, mac)
+               if handle then
+                       exec('tc filter del dev "%s" parent ffff: protocol all prio 2 handle %s u32 police rate %skbit mtu 6k burst 6k drop' % {device, handle, limit_up})
+               else
+                       print('Warning! Could not get a handle for %s parent :ffff on interface %s' % { mac, device })
+               end
+       end
+       -- remove clients class
+       if device and id then
+               exec('tc class del dev "%s" classid 1:%s' % {device, id})
+               exec('tc filter del dev "%s" parent 1:0 prio 1' % device) -- ipv6 rule
+               --exec('tc qdisc del dev "%s" parent 1:%s sfq perturb 10' % { device, id })
+       end
+end
+
+
+-- Add whitelist rules
+function add_whitelist_rule(mac)
+       exec("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
+       exec("iptables -t nat    -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
+       if has_ipv6 then
+               exec("ip6tables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
+       end
+        uci:foreach("luci_splash", "iface", function(s)
+               local device = get_physdev(s['.name'])
+               if device and device ~= "" then
+                       exec('tc filter add dev "%s" parent ffff: protocol ip prio 1 u32 match ether src %s police pass' % { device, mac })
+                       exec('tc filter add dev "%s" parent 1:0 protocol ip prio 1 u32 match ether dst %s classid 1:1' % { device, mac })
+               end
+        end)
+end
+
+
+-- Add blacklist rules
+function add_blacklist_rule(mac)
+       exec("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j DROP" % mac)
+       if has_ipv6 then
+               exec("ip6tables -t filter -I luci_splash_filter -m mac --mac-source %q -j DROP" % mac)
+       end
+end
+
+
+-- Synchronise leases, remove abandoned rules
+function sync()
+       lock()
+
+       local time = os.time()
+
+       -- Current leases in state files
+       local leases = uci:get_all("luci_splash_leases")
+       
+       -- Convert leasetime to seconds
+       local leasetime = tonumber(uci:get("luci_splash", "general", "leasetime")) * 3600
+       
+       -- Clean state file
+       uci:load("luci_splash_leases")
+       uci:revert("luci_splash_leases")
+
+        
+       local arpcache = get_arpcache()
+
+       local blackwhitelist = uci:get_all("luci_splash")
+       local whitelist_total = 0
+       local whitelist_online = 0
+       local blacklist_total = 0
+       local blacklist_online = 0
+       local leasecount = 0
+       local leases_online = 0
+
+       -- 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_lease_rule(v.mac, v.ipaddr, v.device, tonumber(v.limit_up), tonumber(v.limit_down))
+                       else
+                               leasecount = leasecount + 1
+
+                                -- only count leases_online for connected clients
+                                if arpcache[v.mac] then
+                                       leases_online = leases_online + 1
+                                end
+
+                               -- Rewrite state
+                               uci:section("luci_splash_leases", "lease", convert_mac_to_secname(v.mac), {             
+                                       mac    = v.mac,
+                                       ipaddr = v.ipaddr,
+                                       device = v.device,
+                                       limit_up = limit_up,
+                                       limit_down = limit_down,
+                                       start  = v.start
+                               })
+                       end
+               end
+       end
+       
+       -- Whitelist, Blacklist
+       for _, s in utl.spairs(blackwhitelist,
+               function(a,b) return blackwhitelist[a][".type"] > blackwhitelist[b][".type"] end
+       ) do
+               if (s[".type"] == "whitelist") then
+                       whitelist_total = whitelist_total + 1
+                       if s.mac then
+                               local mac = s.mac:lower()
+                               if arpcache[mac] then
+                                       whitelist_online = whitelist_online + 1
+                               end
+                       end
+               end
+               if (s[".type"] == "blacklist") then
+                       blacklist_total = blacklist_total + 1
+                       if s.mac then
+                               local mac = s.mac:lower()
+                               if arpcache[mac] then
+                                       blacklist_online = blacklist_online + 1
+                               end
+                       end
+               end
+       end
+
+       -- ToDo:
+        -- include a new field "leases_online" in stats to differ between active clients and leases:
+        -- update_stats(leasecount, leases_online, whitelist_online, whitelist_total, blacklist_online, blacklist_total) later: 
+        update_stats(leases_online, whitelist_online, whitelist_total, blacklist_online, blacklist_total)
+
+       uci:save("luci_splash_leases")
+
+        -- Get the mac addresses of current leases
+       local macs = get_known_macs()
+
+       ipt:resync()
+
+       ipt_delete_all({table="filter", chain="luci_splash_filter", options={"MAC"}},
+               function(r) return not macs[r.options[2]:lower()] end)
+       ipt_delete_all({table="nat", chain="luci_splash_leases", options={"MAC"}},
+               function(r) return not macs[r.options[2]:lower()] end)
+       ipt_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", "MARK", "set"}},
+               function(r) return not macs[r.options[2]:lower()] end)
+       ipt_delete_all({table="mangle", chain="luci_splash_mark_in", options={"/*", "MARK", "set"}},
+               function(r) return not macs[r.options[2]:lower()] end)
+
+
+       if has_ipv6 then
+               ipt6_delete_all({table="filter", chain="luci_splash_filter", options={"MAC"}},
+                       function(r) return not macs[r.options[2]:lower()] end)
+               ipt6_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", "MARK", "set"}},
+                       function(r) return not macs[r.options[2]:lower()] end)
+       end
+
+       unlock()
+end
+
+-- Show client info
+function list()
+       local arpcache = get_arpcache()
+       -- Find traffic usage
+       local function traffic(lease)
+               local traffic_in  = 0
+               local traffic_out = 0
+
+               local rin  = ipt:find({table="mangle", chain="luci_splash_mark_in", destination=lease.ipaddr})
+               local rout = ipt:find({table="mangle", chain="luci_splash_mark_out", options={"MAC", lease.mac:upper()}})
+
+               if rin  and #rin  > 0 then traffic_in  = math.floor( rin[1].bytes / 1024) end
+               if rout and #rout > 0 then traffic_out = math.floor(rout[1].bytes / 1024) end
+
+               return traffic_in, traffic_out
+       end
+
+       -- Print listings
+       local leases = uci:get_all("luci_splash_leases")
+       local blackwhitelist = uci:get_all("luci_splash")
+
+       print(string.format(
+               "%-17s  %-15s  %-9s  %-4s  %-7s  %20s",
+               "MAC", "IP", "State", "Dur.", "Intf.", "Traffic down/up"
+       ))
+
+       -- Leases
+       for _, s in pairs(leases) do
+               if s[".type"] == "lease" and s.mac then
+                       local ti, to = traffic(s)
+                       local mac = s.mac:lower()
+                       local arp = arpcache[mac]
+                       print(string.format(
+                               "%-17s  %-15s  %-9s  %3dm  %-7s  %7dKB  %7dKB",
+                               mac, s.ipaddr, "leased",
+                               math.floor(( os.time() - tonumber(s.start) ) / 60),
+                               arp and arp[1] or "?", ti, to
+                       ))
+               end
+       end
+
+       -- Whitelist, Blacklist
+       for _, s in utl.spairs(blackwhitelist,
+               function(a,b) return blackwhitelist[a][".type"] > blackwhitelist[b][".type"] end
+       ) do
+               if (s[".type"] == "whitelist" or s[".type"] == "blacklist") and s.mac then
+                       local mac = s.mac:lower()
+                       local arp = arpcache[mac]
+                       print(string.format(
+                               "%-17s  %-15s  %-9s  %4s  %-7s  %9s  %9s",
+                               mac, arp and arp[2] or "?", s[".type"],
+                               "- ", arp and arp[1] or "?", "-", "-"
+                       ))
+               end
+       end
+end
+
+main(arg)