-- Copyright (c) 2018-2021, OARC, Inc. -- All rights reserved. -- -- This file is part of dnsjit. -- -- dnsjit 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 -- (at your option) any later version. -- -- dnsjit 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 dnsjit. If not, see . -- dnsjit.output.udpcli -- Simple and dumb UDP DNS client -- local output = require("dnsjit.output.udpcli").new("127.0.0.1", "53") -- -- Simple and rather dumb DNS client that takes any payload you give it and -- sends the full payload over UDP. -- .SS Attributes -- .TP -- timeout -- A -- .I core.timespec -- that is used when producing objects. module(...,package.seeall) require("dnsjit.output.udpcli_h") local ffi = require("ffi") local C = ffi.C local t_name = "output_udpcli_t" local output_udpcli_t = ffi.typeof(t_name) local Udpcli = {} -- Create a new Udpcli output. function Udpcli.new() local self = { obj = output_udpcli_t(), } C.output_udpcli_init(self.obj) ffi.gc(self.obj, C.output_udpcli_destroy) return setmetatable(self, { __index = Udpcli }) end -- Set the timeout when producing objects. function Udpcli:timeout(seconds, nanoseconds) self.obj.timeout.sec = seconds self.obj.timeout.nsec = nanoseconds end -- Connect to the -- .I host -- and -- .I port -- and return 0 if successful. function Udpcli:connect(host, port) return C.output_udpcli_connect(self.obj, host, port) end -- Enable (true) or disable (false) nonblocking mode and -- return 0 if successful, if -- .I bool -- is not specified then return if nonblocking mode is on (true) or off (false). function Udpcli:nonblocking(bool) if bool == nil then if C.output_udpcli_nonblocking(self.obj) == 1 then return true end return false elseif bool == true then return C.output_udpcli_set_nonblocking(self.obj, 1) else return C.output_udpcli_set_nonblocking(self.obj, 0) end end -- Return the C functions and context for receiving objects, these objects -- will be sent. function Udpcli:receive() return C.output_udpcli_receiver(self.obj), self.obj end -- Return the C functions and context for producing objects, these objects -- are received. -- If nonblocking mode is enabled the producer will return a payload object -- with length zero if there was nothing to receive. -- If nonblocking mode is disabled the producer will wait for data and if -- timed out (see -- .IR timeout ) -- it will return a payload object with length zero. -- The producer returns nil on error. function Udpcli:produce() return C.output_udpcli_producer(self.obj), self.obj end -- Return the number of "packets" sent, actually the number of completely sent -- payloads. function Udpcli:packets() return tonumber(self.obj.pkts) end -- Return the number of "packets" received, actually the number of successful -- calls to -- .IR recvfrom (2) -- that returned data. function Udpcli:received() return tonumber(self.obj.pkts_recv) end -- Return the number of errors when sending or receiving. function Udpcli:errors() return tonumber(self.obj.errs) end return Udpcli