trapd.lua

   1 local socket = require "socket"
   2 local arg = {select(1, ...)}
   3 local port = tonumber(arg[1] or os.getenv("LUASNMP_TRAPDPORT")) or 6000
   4 local log
   5 if _VERSION > "5.1" then
   6    local logger = require "logging.file"
   7    log = logger(arg[2])
   8 else
   9    require "logging.file"
  10    log = logging.file(arg[2])
  11 end
  12 log:setLevel(arg[3] or "INFO")
  13 log:info("TRAPD capture start")
  14
  15 --
  16 -- Collect input from snmptrapd and optionally write into logfile
  17 -- We do not care about contents!
  18 --
  19 local str = ""
  20 for s in io.lines() do
  21    str = str .. " " .. s
  22    log:debug("captured: '".. s .."'")
  23 end
  24
  25 --
  26 -- Send the string to luasnmp
  27 --
  28 sk = socket:udp()
  29 local ip = socket.dns.toip("localhost")
  30 if sk then
  31    log:debug("sending input to "..ip..":"..port)
  32    sk:sendto(str, ip, port)
  33    sk:close()
  34 else
  35    log:error("cannot open udp socket")
  36    os.exit(1)
  37 end
  38
  39 --
  40 -- Close the optional logfile.
  41 --
  42 log:info("TRAPD capture finished.")