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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2021-03-13 07:54:12 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2021-03-13 07:54:12 +0000 |
commit | 4754ed45b607e82450a5e31fea1da3ba61433b04 (patch) | |
tree | 3554490bdc003e6004f605abe41929cdf98b0651 /src/input/fpcap.lua | |
parent | Initial commit. (diff) | |
download | dnsjit-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 '')
-rw-r--r-- | src/input/fpcap.lua | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/input/fpcap.lua b/src/input/fpcap.lua new file mode 100644 index 0000000..2fc2906 --- /dev/null +++ b/src/input/fpcap.lua @@ -0,0 +1,131 @@ +-- 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.fpcap +-- Read input from a PCAP file using fopen() +-- local input = require("dnsjit.input.fpcap").new() +-- input:open("file.pcap") +-- input:receiver(filter_or_output) +-- input:run() +-- +-- Read input from a PCAP file using standard library function +-- .B fopen() +-- 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.fpcap_h") +local ffi = require("ffi") +local C = ffi.C + +local t_name = "input_fpcap_t" +local input_fpcap_t = ffi.typeof(t_name) +local Fpcap = {} + +-- Create a new Fpcap input. +function Fpcap.new() + local self = { + _receiver = nil, + obj = input_fpcap_t(), + } + C.input_fpcap_init(self.obj) + ffi.gc(self.obj, C.input_fpcap_destroy) + return setmetatable(self, { __index = Fpcap }) +end + +-- Return the Log object to control logging of this instance or module. +function Fpcap:log() + if self == nil then + return C.input_fpcap_log() + end + return self.obj._log +end + +-- Set the receiver to pass objects to. +function Fpcap:receiver(o) + self.obj.recv, self.obj.ctx = o:receive() + self._receiver = o +end + +-- Return the C functions and context for producing objects. +function Fpcap:produce() + return C.input_fpcap_producer(self.obj), self.obj +end + +-- Open a PCAP file for processing and read the PCAP header. +-- Returns 0 on success. +function Fpcap:open(file) + return C.input_fpcap_open(self.obj, file) +end + +-- Open a PCAP file for processing and read the PCAP header using a +-- file descriptor, for example +-- .B io.stdin +-- or with +-- .BR io.open() . +-- Will not take ownership of the file descriptor. +-- Returns 0 on success. +function Fpcap:openfp(fp) + return C.input_fpcap_openfp(self.obj, fp) +end + +-- Start processing packets and send each packet read to the receiver. +-- Returns 0 if all packets was read successfully. +function Fpcap:run() + return C.input_fpcap_run(self.obj) +end + +-- Return the number of packets seen. +function Fpcap:packets() + return tonumber(self.obj.pkts) +end + +return Fpcap |