440 lines
12 KiB
Lua
440 lines
12 KiB
Lua
#!/usr/bin/lua
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require("luci.util")
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require("luci.model.uci")
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require("luci.sys")
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require("luci.sys.iptparser")
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-- Init state session
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local uci = luci.model.uci.cursor_state()
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local ipt = luci.sys.iptparser.IptParser()
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local net = luci.sys.net
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local limit_up = 0
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local limit_down = 0
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function lock()
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os.execute("lock -w /var/run/luci_splash.lock && lock /var/run/luci_splash.lock")
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end
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function unlock()
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os.execute("lock -u /var/run/luci_splash.lock")
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end
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function main(argv)
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local cmd = table.remove(argv, 1)
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local arg = argv[1]
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limit_up = tonumber(uci:get("luci_splash", "general", "limit_up")) or 0
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limit_down = tonumber(uci:get("luci_splash", "general", "limit_down")) or 0
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if ( cmd == "lease" or cmd == "add-rules" or cmd == "remove" or
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cmd == "whitelist" or cmd == "blacklist" or cmd == "status" ) and #argv > 0
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then
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lock()
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local arp_cache = net.arptable()
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local leased_macs = get_known_macs("lease")
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local blacklist_macs = get_known_macs("blacklist")
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local whitelist_macs = get_known_macs("whitelist")
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for i, adr in ipairs(argv) do
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local mac = nil
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if adr:find(":") then
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mac = adr:lower()
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else
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for _, e in ipairs(arp_cache) do
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if e["IP address"] == adr then
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mac = e["HW address"]:lower()
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break
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end
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end
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end
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if mac and cmd == "add-rules" then
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if leased_macs[mac] then
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add_lease(mac, arp_cache, true)
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elseif blacklist_macs[mac] then
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add_blacklist_rule(mac)
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elseif whitelist_macs[mac] then
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add_whitelist_rule(mac)
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end
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elseif mac and cmd == "status" then
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print(leased_macs[mac] and "lease"
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or whitelist_macs[mac] and "whitelist"
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or blacklist_macs[mac] and "blacklist"
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or "new")
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elseif mac and ( cmd == "whitelist" or cmd == "blacklist" or cmd == "lease" ) then
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if cmd ~= "lease" and leased_macs[mac] then
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print("Removing %s from leases" % mac)
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remove_lease(mac)
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leased_macs[mac] = nil
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end
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if cmd ~= "whitelist" and whitelist_macs[mac] then
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print("Removing %s from whitelist" % mac)
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remove_whitelist(mac)
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whitelist_macs[mac] = nil
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end
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if cmd ~= "blacklist" and blacklist_macs[mac] then
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print("Removing %s from blacklist" % mac)
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remove_blacklist(mac)
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blacklist_macs[mac] = nil
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end
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if cmd == "lease" and not leased_macs[mac] then
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print("Adding %s to leases" % mac)
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add_lease(mac)
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leased_macs[mac] = true
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elseif cmd == "whitelist" and not whitelist_macs[mac] then
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print("Adding %s to whitelist" % mac)
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add_whitelist(mac)
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whitelist_macs[mac] = true
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elseif cmd == "blacklist" and not blacklist_macs[mac] then
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print("Adding %s to blacklist" % mac)
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add_blacklist(mac)
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blacklist_macs[mac] = true
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else
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print("The mac %s is already %sed" %{ mac, cmd })
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end
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elseif mac and cmd == "remove" then
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if leased_macs[mac] then
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print("Removing %s from leases" % mac)
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remove_lease(mac)
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leased_macs[mac] = nil
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elseif whitelist_macs[mac] then
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print("Removing %s from whitelist" % mac)
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remove_whitelist(mac)
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whitelist_macs[mac] = nil
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elseif blacklist_macs[mac] then
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print("Removing %s from blacklist" % mac)
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remove_blacklist(mac)
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blacklist_macs[mac] = nil
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else
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print("The mac %s is not known" % mac)
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end
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else
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print("Can not find mac for ip %s" % argv[i])
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end
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end
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unlock()
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os.exit(0)
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elseif cmd == "sync" then
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sync()
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os.exit(0)
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elseif cmd == "list" then
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list()
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os.exit(0)
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else
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print("Usage:")
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print("\n luci-splash list\n List connected, black- and whitelisted clients")
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print("\n luci-splash sync\n Synchronize firewall rules and clear expired leases")
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print("\n luci-splash lease <MAC-or-IP>\n Create a lease for the given address")
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print("\n luci-splash blacklist <MAC-or-IP>\n Add given address to blacklist")
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print("\n luci-splash whitelist <MAC-or-IP>\n Add given address to whitelist")
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print("\n luci-splash remove <MAC-or-IP>\n Remove given address from the lease-, black- or whitelist")
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print("")
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os.exit(1)
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end
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end
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-- Get a list of known mac addresses
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function get_known_macs(list)
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local leased_macs = { }
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if not list or list == "lease" then
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uci:foreach("luci_splash", "lease",
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function(s) leased_macs[s.mac:lower()] = true end)
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end
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if not list or list == "whitelist" then
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uci:foreach("luci_splash", "whitelist",
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function(s) leased_macs[s.mac:lower()] = true end)
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end
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if not list or list == "blacklist" then
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uci:foreach("luci_splash", "blacklist",
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function(s) leased_macs[s.mac:lower()] = true end)
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end
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return leased_macs
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end
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-- Get a list of known ip addresses
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function get_known_ips(macs, arp)
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local leased_ips = { }
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if not macs then macs = get_known_macs() end
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for _, e in ipairs(arp or net.arptable()) do
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if macs[e["HW address"]:lower()] then leased_ips[e["IP address"]] = true end
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end
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return leased_ips
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end
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-- Helper to delete iptables rules
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function ipt_delete_all(args, comp, off)
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off = off or { }
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for i, r in ipairs(ipt:find(args)) do
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if comp == nil or comp(r) then
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off[r.table] = off[r.table] or { }
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off[r.table][r.chain] = off[r.table][r.chain] or 0
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os.execute("iptables -t %q -D %q %d 2>/dev/null"
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%{ r.table, r.chain, r.index - off[r.table][r.chain] })
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off[r.table][r.chain] = off[r.table][r.chain] + 1
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end
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end
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end
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-- Add a lease to state and invoke add_rule
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function add_lease(mac, arp, no_uci)
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mac = mac:lower()
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-- Get current ip address
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local ipaddr
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for _, entry in ipairs(arp or net.arptable()) do
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if entry["HW address"]:lower() == mac then
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ipaddr = entry["IP address"]
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break
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end
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end
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-- Add lease if there is an ip addr
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if ipaddr then
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if not no_uci then
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uci:section("luci_splash", "lease", nil, {
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mac = mac,
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ipaddr = ipaddr,
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start = os.time()
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})
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uci:save("luci_splash")
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end
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add_lease_rule(mac, ipaddr)
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else
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print("Found no active IP for %s, lease not added" % mac)
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end
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end
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-- Remove a lease from state and invoke remove_rule
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function remove_lease(mac)
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mac = mac:lower()
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uci:delete_all("luci_splash", "lease",
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function(s)
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if s.mac:lower() == mac then
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remove_lease_rule(mac, s.ipaddr)
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return true
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end
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return false
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end)
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uci:save("luci_splash")
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end
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-- Add a whitelist entry
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function add_whitelist(mac)
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uci:section("luci_splash", "whitelist", nil, { mac = mac })
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uci:save("luci_splash")
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uci:commit("luci_splash")
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add_whitelist_rule(mac)
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end
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-- Add a blacklist entry
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function add_blacklist(mac)
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uci:section("luci_splash", "blacklist", nil, { mac = mac })
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uci:save("luci_splash")
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uci:commit("luci_splash")
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add_blacklist_rule(mac)
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end
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-- Remove a whitelist entry
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function remove_whitelist(mac)
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mac = mac:lower()
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uci:delete_all("luci_splash", "whitelist",
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function(s) return not s.mac or s.mac:lower() == mac end)
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uci:save("luci_splash")
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uci:commit("luci_splash")
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remove_lease_rule(mac)
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end
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-- Remove a blacklist entry
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function remove_blacklist(mac)
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mac = mac:lower()
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uci:delete_all("luci_splash", "blacklist",
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function(s) return not s.mac or s.mac:lower() == mac end)
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uci:save("luci_splash")
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uci:commit("luci_splash")
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remove_lease_rule(mac)
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end
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-- Add an iptables rule
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function add_lease_rule(mac, ipaddr)
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if limit_up > 0 and limit_down > 0 then
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os.execute("iptables -t mangle -I luci_splash_mark_out -m mac --mac-source %q -j MARK --set-mark 79" % mac)
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os.execute("iptables -t mangle -I luci_splash_mark_in -d %q -j MARK --set-mark 80" % ipaddr)
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end
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os.execute("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
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os.execute("iptables -t nat -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
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end
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-- Remove lease, black- or whitelist rules
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function remove_lease_rule(mac, ipaddr)
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ipt:resync()
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if ipaddr then
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ipt_delete_all({table="mangle", chain="luci_splash_mark_in", destination=ipaddr})
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ipt_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", mac:upper()}})
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end
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ipt_delete_all({table="filter", chain="luci_splash_filter", options={"MAC", mac:upper()}})
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ipt_delete_all({table="nat", chain="luci_splash_leases", options={"MAC", mac:upper()}})
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end
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-- Add whitelist rules
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function add_whitelist_rule(mac)
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os.execute("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
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os.execute("iptables -t nat -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
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end
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-- Add blacklist rules
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function add_blacklist_rule(mac)
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os.execute("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j DROP" % mac)
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os.execute("iptables -t nat -I luci_splash_leases -m mac --mac-source %q -j DROP" % mac)
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end
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-- Synchronise leases, remove abandoned rules
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function sync()
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lock()
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local time = os.time()
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-- 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")
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uci:revert("luci_splash")
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-- For all leases
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for k, v in pairs(leases) do
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if v[".type"] == "lease" then
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if os.difftime(time, tonumber(v.start)) > leasetime then
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-- Remove expired
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remove_lease_rule(v.mac, v.ipaddr)
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else
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-- Rewrite state
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uci:section("luci_splash", "lease", nil, {
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mac = v.mac,
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ipaddr = v.ipaddr,
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start = v.start
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})
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end
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end
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end
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uci:save("luci_splash")
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-- Get current IPs and MAC addresses
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local macs = get_known_macs()
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local ips = get_known_ips(macs)
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ipt:resync()
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ipt_delete_all({table="filter", chain="luci_splash_filter", options={"MAC"}},
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function(r) return not macs[r.options[2]:lower()] end)
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ipt_delete_all({table="nat", chain="luci_splash_leases", options={"MAC"}},
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function(r) return not macs[r.options[2]:lower()] end)
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ipt_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", "MARK", "set"}},
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function(r) return not macs[r.options[2]:lower()] end)
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ipt_delete_all({table="mangle", chain="luci_splash_mark_in", options={"MARK", "set"}},
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function(r) return not ips[r.destination] end)
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unlock()
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end
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-- Show client info
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function list()
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-- Get current arp cache
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local arpcache = { }
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for _, entry in ipairs(net.arptable()) do
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arpcache[entry["HW address"]:lower()] = { entry["Device"], entry["IP address"] }
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end
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-- Find traffic usage
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local function traffic(lease)
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local traffic_in = 0
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local traffic_out = 0
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local rin = ipt:find({table="mangle", chain="luci_splash_mark_in", destination=lease.ipaddr})
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local rout = ipt:find({table="mangle", chain="luci_splash_mark_out", options={"MAC", lease.mac:upper()}})
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if rin and #rin > 0 then traffic_in = math.floor( rin[1].bytes / 1024) end
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if rout and #rout > 0 then traffic_out = math.floor(rout[1].bytes / 1024) end
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return traffic_in, traffic_out
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end
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-- Print listings
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local leases = uci:get_all("luci_splash")
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print(string.format(
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"%-17s %-15s %-9s %-4s %-7s %20s",
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"MAC", "IP", "State", "Dur.", "Intf.", "Traffic down/up"
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))
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-- Leases
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for _, s in pairs(leases) do
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if s[".type"] == "lease" and s.mac then
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local ti, to = traffic(s)
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local mac = s.mac:lower()
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local arp = arpcache[mac]:lower()
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print(string.format(
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"%-17s %-15s %-9s %3dm %-7s %7dKB %7dKB",
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mac, s.ipaddr, "leased",
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math.floor(( os.time() - tonumber(s.start) ) / 60),
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arp and arp[1] or "?", ti, to
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))
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end
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end
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-- Whitelist, Blacklist
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for _, s in luci.util.spairs(leases,
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function(a,b) return leases[a][".type"] > leases[b][".type"] end
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) do
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if (s[".type"] == "whitelist" or s[".type"] == "blacklist") and s.mac then
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local mac = s.mac:lower()
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local arp = arpcache[mac]:lower()
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print(string.format(
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"%-17s %-15s %-9s %4s %-7s %9s %9s",
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mac, arp and arp[2] or "?", s[".type"], "- ",
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arp and arp[1] or "?", "-", "-"
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))
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end
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end
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end
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main(arg)
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