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-- Copyright (c) 2018-2024 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 <http://www.gnu.org/licenses/>.
-- dnsjit.output.pcap
-- Output to a PCAP using libpcap
-- local output = require("dnsjit.output.pcap").new()
-- output:open("file.pcap")
-- ...
-- output:close()
--
-- Output module for writing
-- .I dnsjit.core.object.pcap
-- objects to a PCAP,
module(...,package.seeall)
require("dnsjit.output.pcap_h")
local ffi = require("ffi")
local C = ffi.C
local t_name = "output_pcap_t"
local output_pcap_t = ffi.typeof(t_name)
local Pcap = {}
-- Create a new Pcap output.
function Pcap.new()
local self = {
obj = output_pcap_t(),
}
C.output_pcap_init(self.obj)
ffi.gc(self.obj, C.output_pcap_destroy)
return setmetatable(self, { __index = Pcap })
end
-- Return the Log object to control logging of this instance or module.
function Pcap:log()
if self == nil then
return C.output_pcap_log()
end
return self.obj._log
end
-- Open the PCAP
-- .I file
-- to write to using the
-- .I linktype
-- and
-- .IR snaplen .
-- Uses
-- .B pcap_dump_open()
-- so you can pass "-" to it to open stdout, see it's man-page for more
-- information.
-- Returns 0 on success.
function Pcap:open(file, linktype, snaplen)
return C.output_pcap_open(self.obj, file, linktype, snaplen)
end
-- Close the PCAP.
function Pcap:close()
C.output_pcap_close(self.obj)
end
-- Return true if the underlying
-- .I FILE*
-- indicates that there's been an error.
function Pcap:have_errors()
if C.output_pcap_have_errors(self.obj) == 0 then
return false
end
return true
end
-- Return the C functions and context for receiving objects.
function Pcap:receive()
return C.output_pcap_receiver(self.obj), self.obj
end
-- dnsjit.input.pcap (3)
return Pcap
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