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Diffstat (limited to '')
-rw-r--r-- | src/core/object/tcp.lua | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/core/object/tcp.lua b/src/core/object/tcp.lua new file mode 100644 index 0000000..e1d6dc2 --- /dev/null +++ b/src/core/object/tcp.lua @@ -0,0 +1,110 @@ +-- 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.core.object.tcp +-- A TCP segment header +-- +-- A TCP segment header. +-- The data itself is in the +-- .I dnsjit.core.object.payload +-- object, which is the next object in the chain after parsing with, +-- for example, +-- .IR dnsjit.filter.layer . +-- .SS Attributes +-- .TP +-- sport +-- Source port. +-- .TP +-- dport +-- Destination port. +-- .TP +-- seq +-- Sequence number. +-- .TP +-- ack +-- Acknowledgement number. +-- .TP +-- off +-- Data offset. +-- .TP +-- x2 +-- Unused. +-- .TP +-- flags +-- TCP flags. +-- .TP +-- win +-- Window. +-- .TP +-- sum +-- Checksum. +-- .TP +-- urp +-- Urgent pointer. +-- .TP +-- opts +-- Array of bytes with the TCP options found. +-- .TP +-- opts_len +-- Length of the TCP options. +module(...,package.seeall) + +require("dnsjit.core.object.tcp_h") +local ffi = require("ffi") +local C = ffi.C + +local t_name = "core_object_tcp_t" +local core_object_tcp_t +local Tcp = {} + +-- Return the textual type of the object. +function Tcp:type() + return "tcp" +end + +-- Return the previous object. +function Tcp:prev() + return self.obj_prev +end + +-- Cast the object to the underlining object module and return it. +function Tcp:cast() + return self +end + +-- Cast the object to the generic object module and return it. +function Tcp:uncast() + return ffi.cast("core_object_t*", self) +end + +-- Make a copy of the object and return it. +function Tcp:copy() + return C.core_object_tcp_copy(self) +end + +-- Free the object, should only be used on copies or otherwise allocated. +function Tcp:free() + C.core_object_tcp_free(self) +end + +core_object_tcp_t = ffi.metatype(t_name, { __index = Tcp }) + +-- dnsjit.core.object (3), +-- dnsjit.core.object.payload (3), +-- dnsjit.filter.layer (3) +return Tcp |