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authorDaniel Baumann <daniel.baumann@progress-linux.org>2021-03-13 07:54:12 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2021-03-13 07:54:12 +0000
commit4754ed45b607e82450a5e31fea1da3ba61433b04 (patch)
tree3554490bdc003e6004f605abe41929cdf98b0651 /src/input/mmpcap.lua
parentInitial commit. (diff)
downloaddnsjit-4754ed45b607e82450a5e31fea1da3ba61433b04.tar.xz
dnsjit-4754ed45b607e82450a5e31fea1da3ba61433b04.zip
Adding upstream version 1.1.0+debian.upstream/1.1.0+debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/input/mmpcap.lua')
-rw-r--r--src/input/mmpcap.lua120
1 files changed, 120 insertions, 0 deletions
diff --git a/src/input/mmpcap.lua b/src/input/mmpcap.lua
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+-- 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 <http://www.gnu.org/licenses/>.
+
+-- dnsjit.input.mmpcap
+-- Read input from a PCAP file using mmap()
+-- local input = require("dnsjit.input.fpcap").new()
+-- input:open("file.pcap")
+-- input:receiver(filter_or_output)
+-- input:run()
+--
+-- Read input from a PCAP file by mapping the whole file to memory using
+-- .B mmap()
+-- and parse the PCAP without libpcap.
+-- After opening a file and reading the PCAP header, the attributes are
+-- populated.
+-- .SS Attributes
+-- .TP
+-- is_swapped
+-- Indicate if the byte order in the PCAP is in reverse order of the host.
+-- .TP
+-- is_nanosec
+-- Indicate if the time stamps are in nanoseconds or not.
+-- .TP
+-- magic_number
+-- Magic number.
+-- .TP
+-- version_major
+-- Major version number.
+-- .TP
+-- version_minor
+-- Minor version number.
+-- .TP
+-- thiszone
+-- GMT to local correction.
+-- .TP
+-- sigfigs
+-- Accuracy of timestamps.
+-- .TP
+-- snaplen
+-- Max length of captured packets, in octets.
+-- .TP
+-- network
+-- The link type found in the PCAP header, see https://www.tcpdump.org/linktypes.html .
+-- .TP
+-- linktype
+-- The data link type, mapped from
+-- .IR network .
+module(...,package.seeall)
+
+require("dnsjit.input.mmpcap_h")
+local ffi = require("ffi")
+local C = ffi.C
+
+local t_name = "input_mmpcap_t"
+local input_mmpcap_t = ffi.typeof(t_name)
+local Mmpcap = {}
+
+-- Create a new Mmpcap input.
+function Mmpcap.new()
+ local self = {
+ _receiver = nil,
+ obj = input_mmpcap_t(),
+ }
+ C.input_mmpcap_init(self.obj)
+ ffi.gc(self.obj, C.input_mmpcap_destroy)
+ return setmetatable(self, { __index = Mmpcap })
+end
+
+-- Return the Log object to control logging of this instance or module.
+function Mmpcap:log()
+ if self == nil then
+ return C.input_mmpcap_log()
+ end
+ return self.obj._log
+end
+
+-- Set the receiver to pass objects to.
+function Mmpcap:receiver(o)
+ self.obj.recv, self.obj.ctx = o:receive()
+ self._receiver = o
+end
+
+-- Return the C functions and context for producing objects.
+function Mmpcap:produce()
+ return C.input_mmpcap_producer(self.obj), self.obj
+end
+
+-- Open a PCAP file for processing and read the PCAP header.
+-- Returns 0 on success.
+function Mmpcap:open(file)
+ return C.input_mmpcap_open(self.obj, file)
+end
+
+-- Start processing packets and send each packet read to the receiver.
+-- Returns 0 if all packets was read successfully.
+function Mmpcap:run()
+ return C.input_mmpcap_run(self.obj)
+end
+
+-- Return the number of packets seen.
+function Mmpcap:packets()
+ return tonumber(self.obj.pkts)
+end
+
+return Mmpcap