--
--  anylike
--
--  anylike is an IKEv2 Implementation written in Lua and C. It's main 
--  design goal is to provide anytun and uanytun or any other SATP 
--  implementation with a key exchange mechanism but it should also be 
--  possible to use anylike as key exchange daemon for IPSec security 
--  associations. The use of Lua guarantees that anylike is easily 
--  portable to many platforms including very small ones like wireless 
--  routers.
--  
--
--  Copyright (C) 2007-2008 Markus Grueneis <gimpf@anylike.org>
--                          Christian Pointner <equinox@anylike.org>
--
--  This file is part of anylike.
--
--  anylike is free software: you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation, either version 3 of the License, or
--  any later version.
--
--  anylike is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with anylike. If not, see <http://www.gnu.org/licenses/>.
--

socket = require("socket")

function main_loop(opt) 
   log.printf(log.NOTICE, "main_loop started")
   local sig = signal.init()

   if(opt.debug) then
      local ret = debug_shell.init("localhost", 9000)
      if(ret == nil) then return -1 end
   end

   local return_value = 0
   while return_value == 0 do
      local readable, _, err = socket.select({ sig , unpack(debug_shell.socks) } , nil)
      if(err) then
         log.printf(log.ERROR, "select returned with error: %s", err)
         return_value = -1
      else
         for _, input in ipairs(readable) do
            if(input == sig) then
               return_value = signal.handle()
               if(return_value == 1) then break end
            elseif(input == debug_shell.socks[1] or input == debug_shell.socks[2]) then
               return_value = debug_shell.handle(input)
               if(return_value == 2) then break end
            else
               log.printf(log.ERROR, "select returned unknown file descriptor!?")
            end
         end
      end
   end

   if(return_value == 2) then return_value = 0 end

   if(opt.debug) then
      debug_shell.close();
   end
   signal.stop()
   return return_value
end