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

   1 #!/usr/bin/lua
   2
   3 require("luci.util")
   4 require("luci.model.uci")
   5 require("luci.sys")
   6 require("luci.sys.iptparser")
   7
   8 -- Init state session
   9 local uci = luci.model.uci.cursor_state()
  10 local ipt = luci.sys.iptparser.IptParser()
  11 local net = luci.sys.net
  12
  13 local limit_up = 0
  14 local limit_down = 0
  15
  16 function lock()
  17         os.execute("lock -w /var/run/luci_splash.lock && lock /var/run/luci_splash.lock")
  18 end
  19
  20 function unlock()
  21         os.execute("lock -u /var/run/luci_splash.lock")
  22 end
  23
  24 function main(argv)
  25         local cmd = table.remove(argv, 1)
  26         local arg = argv[1]
  27
  28         limit_up = tonumber(uci:get("luci_splash", "general", "limit_up")) or 0
  29         limit_down = tonumber(uci:get("luci_splash", "general", "limit_down")) or 0
  30
  31         if ( cmd == "lease" or cmd == "add-rules" or cmd == "remove" or
  32              cmd == "whitelist" or cmd == "blacklist" ) and #argv > 0
  33         then
  34                 lock()
  35
  36                 local arp_cache      = net.arptable()
  37                 local leased_macs    = get_known_macs("lease")
  38                 local blacklist_macs = get_known_macs("blacklist")
  39                 local whitelist_macs = get_known_macs("whitelist")
  40
  41                 for i, adr in ipairs(argv) do
  42                         local mac = nil
  43                         if adr:find(":") then
  44                                 mac = adr:lower()
  45                         else
  46                                 for _, e in ipairs(arp_cache) do
  47                                         if e["IP address"] == adr then
  48                                                 mac = e["HW address"]
  49                                                 break
  50                                         end
  51                                 end
  52                         end
  53
  54                         if mac and cmd == "add-rules" then
  55                                 if leased_macs[mac] then
  56                                         add_lease(mac, arp_cache, true)
  57                                 elseif blacklist_macs[mac] then
  58                                         add_blacklist_rule(mac)
  59                                 elseif whitelist_macs[mac] then
  60                                         add_whitelist_rule(mac)
  61                                 end
  62                         elseif mac and ( cmd == "whitelist" or cmd == "blacklist" or cmd == "lease" ) then
  63                                 if cmd ~= "lease" and leased_macs[mac] then
  64                                         print("Removing %s from leases" % mac)
  65                                         remove_lease(mac)
  66                                         leased_macs[mac] = nil
  67                                 end
  68
  69                                 if cmd ~= "whitelist" and whitelist_macs[mac] then
  70                                         print("Removing %s from whitelist" % mac)
  71                                         remove_whitelist(mac)
  72                                         whitelist_macs[mac] = nil
  73                                 end
  74
  75                                 if cmd ~= "blacklist" and blacklist_macs[mac] then
  76                                         print("Removing %s from blacklist" % mac)
  77                                         remove_blacklist(mac)
  78                                         blacklist_macs[mac] = nil
  79                                 end
  80
  81                                 if cmd == "lease" and not leased_macs[mac] then
  82                                         print("Adding %s to leases" % mac)
  83                                         add_lease(mac)
  84                                         leased_macs[mac] = true
  85                                 elseif cmd == "whitelist" and not whitelist_macs[mac] then
  86                                         print("Adding %s to whitelist" % mac)
  87                                         add_whitelist(mac)
  88                                         whitelist_macs[mac] = true
  89                                 elseif cmd == "blacklist" and not blacklist_macs[mac] then
  90                                         print("Adding %s to blacklist" % mac)
  91                                         add_blacklist(mac)
  92                                         blacklist_macs[mac] = true
  93                                 else
  94                                         print("The mac %s is already %sed" %{ mac, cmd })
  95                                 end
  96                         elseif mac and cmd == "remove" then
  97                                 if leased_macs[mac] then
  98                                         print("Removing %s from leases" % mac)
  99                                         remove_lease(mac)
 100                                         leased_macs[mac] = nil
 101                                 elseif whitelist_macs[mac] then
 102                                         print("Removing %s from whitelist" % mac)
 103                                         remove_whitelist(mac)
 104                                         whitelist_macs[mac] = nil
 105                                 elseif blacklist_macs[mac] then
 106                                         print("Removing %s from blacklist" % mac)
 107                                         remove_blacklist(mac)
 108                                         blacklist_macs[mac] = nil
 109                                 else
 110                                         print("The mac %s is not known" % mac)
 111                                 end
 112                         else
 113                                 print("Can not find mac for ip %s" % argv[i])
 114                         end
 115                 end
 116
 117                 unlock()
 118                 os.exit(0)
 119         elseif cmd == "sync" then
 120                 sync()
 121                 os.exit(0)
 122         elseif cmd == "list" then
 123                 list()
 124                 os.exit(0)
 125         else
 126                 print("Usage:")
 127                 print("\n  luci-splash list\n    List connected, black- and whitelisted clients")
 128                 print("\n  luci-splash sync\n    Synchronize firewall rules and clear expired leases")
 129                 print("\n  luci-splash lease <MAC-or-IP>\n    Create a lease for the given address")
 130                 print("\n  luci-splash blacklist <MAC-or-IP>\n    Add given address to blacklist")
 131                 print("\n  luci-splash whitelist <MAC-or-IP>\n    Add given address to whitelist")
 132                 print("\n  luci-splash remove <MAC-or-IP>\n    Remove given address from the lease-, black- or whitelist")
 133                 print("")
 134
 135                 os.exit(1)
 136         end
 137 end
 138
 139 -- Get a list of known mac addresses
 140 function get_known_macs(list)
 141         local leased_macs = { }
 142
 143         if not list or list == "lease" then
 144                 uci:foreach("luci_splash", "lease",
 145                         function(s) leased_macs[s.mac:lower()] = true end)
 146         end
 147
 148         if not list or list == "whitelist" then
 149                 uci:foreach("luci_splash", "whitelist",
 150                         function(s) leased_macs[s.mac:lower()] = true end)
 151         end
 152
 153         if not list or list == "blacklist" then
 154                 uci:foreach("luci_splash", "blacklist",
 155                         function(s) leased_macs[s.mac:lower()] = true end)
 156         end
 157
 158         return leased_macs
 159 end
 160
 161
 162 -- Get a list of known ip addresses
 163 function get_known_ips(macs, arp)
 164         local leased_ips = { }
 165         if not macs then macs = get_known_macs() end
 166         for _, e in ipairs(arp or net.arptable()) do
 167                 if macs[e["HW address"]] then leased_ips[e["IP address"]] = true end
 168         end
 169         return leased_ips
 170 end
 171
 172
 173 -- Helper to delete iptables rules
 174 function ipt_delete_all(args, comp, off)
 175         off = off or { }
 176         for i, r in ipairs(ipt:find(args)) do
 177                 if comp == nil or comp(r) then
 178                         off[r.table] = off[r.table] or { }
 179                         off[r.table][r.chain] = off[r.table][r.chain] or 0
 180
 181                         os.execute("iptables -t %q -D %q %d 2>/dev/null"
 182                                 %{ r.table, r.chain, r.index - off[r.table][r.chain] })
 183
 184                         off[r.table][r.chain] = off[r.table][r.chain] + 1
 185                 end
 186         end
 187 end
 188
 189
 190 -- Add a lease to state and invoke add_rule
 191 function add_lease(mac, arp, no_uci)
 192         mac = mac:lower()
 193
 194         -- Get current ip address
 195         local ipaddr
 196         for _, entry in ipairs(arp or net.arptable()) do
 197                 if entry["HW address"] == mac then
 198                         ipaddr = entry["IP address"]
 199                         break
 200                 end
 201         end
 202
 203         -- Add lease if there is an ip addr
 204         if ipaddr then
 205                 if not no_uci then
 206                         uci:section("luci_splash", "lease", nil, {
 207                                 mac    = mac,
 208                                 ipaddr = ipaddr,
 209                                 start  = os.time()
 210                         })
 211                         uci:save("luci_splash")
 212                 end
 213                 add_lease_rule(mac, ipaddr)
 214         else
 215                 print("Found no active IP for %s, lease not added" % mac)
 216         end
 217 end
 218
 219
 220 -- Remove a lease from state and invoke remove_rule
 221 function remove_lease(mac)
 222         mac = mac:lower()
 223
 224         uci:delete_all("luci_splash", "lease",
 225                 function(s)
 226                         if s.mac:lower() == mac then
 227                                 remove_lease_rule(mac, s.ipaddr)
 228                                 return true
 229                         end
 230                         return false
 231                 end)
 232
 233         uci:save("luci_splash")
 234 end
 235
 236
 237 -- Add a whitelist entry
 238 function add_whitelist(mac)
 239         uci:section("luci_splash", "whitelist", nil, { mac = mac })
 240         uci:save("luci_splash")
 241         uci:commit("luci_splash")
 242         add_whitelist_rule(mac)
 243 end
 244
 245
 246 -- Add a blacklist entry
 247 function add_blacklist(mac)
 248         uci:section("luci_splash", "blacklist", nil, { mac = mac })
 249         uci:save("luci_splash")
 250         uci:commit("luci_splash")
 251         add_blacklist_rule(mac)
 252 end
 253
 254
 255 -- Remove a whitelist entry
 256 function remove_whitelist(mac)
 257         mac = mac:lower()
 258         uci:delete_all("luci_splash", "whitelist",
 259                 function(s) return not s.mac or s.mac:lower() == mac end)
 260         uci:save("luci_splash")
 261         uci:commit("luci_splash")
 262         remove_lease_rule(mac)
 263 end
 264
 265
 266 -- Remove a blacklist entry
 267 function remove_blacklist(mac)
 268         mac = mac:lower()
 269         uci:delete_all("luci_splash", "blacklist",
 270                 function(s) return not s.mac or s.mac:lower() == mac end)
 271         uci:save("luci_splash")
 272         uci:commit("luci_splash")
 273         remove_lease_rule(mac)
 274 end
 275
 276
 277 -- Add an iptables rule
 278 function add_lease_rule(mac, ipaddr)
 279         if limit_up > 0 and limit_down > 0 then
 280                 os.execute("iptables -t mangle -I luci_splash_mark_out -m mac --mac-source %q -j MARK --set-mark 79" % mac)
 281                 os.execute("iptables -t mangle -I luci_splash_mark_in -d %q -j MARK --set-mark 80" % ipaddr)
 282         end
 283
 284         os.execute("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
 285         os.execute("iptables -t nat    -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
 286 end
 287
 288
 289 -- Remove lease, black- or whitelist rules
 290 function remove_lease_rule(mac, ipaddr)
 291         ipt:resync()
 292
 293         if ipaddr then
 294                 ipt_delete_all({table="mangle", chain="luci_splash_mark_in",  destination=ipaddr})
 295                 ipt_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", mac:upper()}})
 296         end
 297
 298         ipt_delete_all({table="filter", chain="luci_splash_filter",   options={"MAC", mac:upper()}})
 299         ipt_delete_all({table="nat",    chain="luci_splash_leases",   options={"MAC", mac:upper()}})
 300 end
 301
 302
 303 -- Add whitelist rules
 304 function add_whitelist_rule(mac)
 305         os.execute("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j RETURN" % mac)
 306         os.execute("iptables -t nat    -I luci_splash_leases -m mac --mac-source %q -j RETURN" % mac)
 307 end
 308
 309
 310 -- Add blacklist rules
 311 function add_blacklist_rule(mac)
 312         os.execute("iptables -t filter -I luci_splash_filter -m mac --mac-source %q -j DROP" % mac)
 313         os.execute("iptables -t nat    -I luci_splash_leases -m mac --mac-source %q -j DROP" % mac)
 314 end
 315
 316
 317 -- Synchronise leases, remove abandoned rules
 318 function sync()
 319         lock()
 320
 321         local time = os.time()
 322
 323         -- Current leases in state files
 324         local leases = uci:get_all("luci_splash")
 325
 326         -- Convert leasetime to seconds
 327         local leasetime = tonumber(uci:get("luci_splash", "general", "leasetime")) * 3600
 328
 329         -- Clean state file
 330         uci:load("luci_splash")
 331         uci:revert("luci_splash")
 332
 333         -- For all leases
 334         for k, v in pairs(leases) do
 335                 if v[".type"] == "lease" then
 336                         if os.difftime(time, tonumber(v.start)) > leasetime then
 337                                 -- Remove expired
 338                                 remove_lease_rule(v.mac, v.ipaddr)
 339                         else
 340                                 -- Rewrite state
 341                                 uci:section("luci_splash", "lease", nil, {
 342                                         mac    = v.mac,
 343                                         ipaddr = v.ipaddr,
 344                                         start  = v.start
 345                                 })
 346                         end
 347                 end
 348         end
 349
 350         uci:save("luci_splash")
 351
 352         -- Get current IPs and MAC addresses
 353         local macs = get_known_macs()
 354         local ips  = get_known_ips(macs)
 355
 356         ipt:resync()
 357
 358         ipt_delete_all({table="filter", chain="luci_splash_filter", options={"MAC"}},
 359                 function(r) return not macs[r.options[2]:lower()] end)
 360
 361         ipt_delete_all({table="nat", chain="luci_splash_leases", options={"MAC"}},
 362                 function(r) return not macs[r.options[2]:lower()] end)
 363
 364         ipt_delete_all({table="mangle", chain="luci_splash_mark_out", options={"MAC", "MARK", "set"}},
 365                 function(r) return not macs[r.options[2]:lower()] end)
 366
 367         ipt_delete_all({table="mangle", chain="luci_splash_mark_in", options={"MARK", "set"}},
 368                 function(r) return not ips[r.destination] end)
 369
 370         unlock()
 371 end
 372
 373 -- Show client info
 374 function list()
 375         -- Get current arp cache
 376         local arpcache = { }
 377         for _, entry in ipairs(net.arptable()) do
 378                 arpcache[entry["HW address"]] = { entry["Device"], entry["IP address"] }
 379         end
 380
 381         -- Find traffic usage
 382         local function traffic(lease)
 383                 local traffic_in  = 0
 384                 local traffic_out = 0
 385
 386                 local rin  = ipt:find({table="mangle", chain="luci_splash_mark_in", destination=lease.ipaddr})
 387                 local rout = ipt:find({table="mangle", chain="luci_splash_mark_out", options={"MAC", lease.mac:upper()}})
 388
 389                 if rin  and #rin  > 0 then traffic_in  = math.floor( rin[1].bytes / 1024) end
 390                 if rout and #rout > 0 then traffic_out = math.floor(rout[1].bytes / 1024) end
 391
 392                 return traffic_in, traffic_out
 393         end
 394
 395         -- Print listings
 396         local leases = uci:get_all("luci_splash")
 397
 398         print(string.format(
 399                 "%-17s  %-15s  %-9s  %-4s  %-7s  %20s",
 400                 "MAC", "IP", "State", "Dur.", "Intf.", "Traffic down/up"
 401         ))
 402
 403         -- Leases
 404         for _, s in pairs(leases) do
 405                 if s[".type"] == "lease" and s.mac then
 406                         local ti, to = traffic(s)
 407                         local mac = s.mac:lower()
 408                         local arp = arpcache[mac]
 409                         print(string.format(
 410                                 "%-17s  %-15s  %-9s  %3dm  %-7s  %7dKB  %7dKB",
 411                                 mac, s.ipaddr, "leased",
 412                                 math.floor(( os.time() - tonumber(s.start) ) / 60),
 413                                 arp and arp[1] or "?", ti, to
 414                         ))
 415                 end
 416         end
 417
 418         -- Whitelist, Blacklist
 419         for _, s in luci.util.spairs(leases,
 420                 function(a,b) return leases[a][".type"] > leases[b][".type"] end
 421         ) do
 422                 if (s[".type"] == "whitelist" or s[".type"] == "blacklist") and s.mac then
 423                         local mac = s.mac:lower()
 424                         local arp = arpcache[mac]
 425                         print(string.format(
 426                                 "%-17s  %-15s  %-9s  %4s  %-7s  %9s  %9s",
 427                                 mac, arp and arp[2] or "?", s[".type"], "- ",
 428                                 arp and arp[1] or "?", "-", "-"
 429                         ))
 430                 end
 431         end
 432 end
 433
 434 main(arg)