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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/core/object.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/core/object.lua | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/core/object.lua b/src/core/object.lua new file mode 100644 index 0000000..7f58829 --- /dev/null +++ b/src/core/object.lua @@ -0,0 +1,177 @@ +-- 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 +-- Base object that is passed between receiver and receivee +-- require("dnsjit.core.object") +-- print(object:type()) +-- packet = object:cast() +-- +-- This is the base object that can be casted to other objects that to +-- describe a DNS message, how it was captured or generated. +-- Objects can be chained together, for example a DNS message is created +-- ontop of a packet. +-- .SS Attributes +-- .TP +-- obj_type +-- The enum of the object type. +-- .TP +-- obj_prev +-- The previous object in the object chain. +module(...,package.seeall) + +require("dnsjit.core.object_h") +require("dnsjit.core.object.pcap_h") +require("dnsjit.core.object.ether_h") +require("dnsjit.core.object.null_h") +require("dnsjit.core.object.loop_h") +require("dnsjit.core.object.linuxsll_h") +require("dnsjit.core.object.ieee802_h") +require("dnsjit.core.object.gre_h") +require("dnsjit.core.object.ip_h") +require("dnsjit.core.object.ip6_h") +require("dnsjit.core.object.icmp_h") +require("dnsjit.core.object.icmp6_h") +require("dnsjit.core.object.udp_h") +require("dnsjit.core.object.tcp_h") +require("dnsjit.core.object.payload_h") +require("dnsjit.core.object.dns_h") +local ffi = require("ffi") +local C = ffi.C + +local t_name = "core_object_t" +local core_object_t +local Object = { + NONE = 0, + PCAP = 1, + ETHER = 10, + NULL = 11, + LOOP = 12, + LINUXSLL = 13, + IEEE802 = 14, + GRE = 15, + IP = 20, + IP6 = 21, + ICMP = 22, + ICMP6 = 23, + UDP = 30, + TCP = 31, + PAYLOAD = 40, + DNS = 50 +} + +local _type = {} +_type[Object.PCAP] = "pcap" +_type[Object.ETHER] = "ether" +_type[Object.NULL] = "null" +_type[Object.LOOP] = "loop" +_type[Object.LINUXSLL] = "linuxsll" +_type[Object.IEEE802] = "ieee802" +_type[Object.GRE] = "gre" +_type[Object.IP] = "ip" +_type[Object.IP6] = "ip6" +_type[Object.ICMP] = "icmp" +_type[Object.ICMP6] = "icmp6" +_type[Object.UDP] = "udp" +_type[Object.TCP] = "tcp" +_type[Object.PAYLOAD] = "payload" +_type[Object.DNS] = "dns" + +_type[Object.NONE] = "none" + +-- Return the textual type of the object. +function Object:type() + return _type[self.obj_type] +end + +-- Return the previous object. +function Object:prev() + return self.obj_prev +end + +local _cast = {} +_cast[Object.PCAP] = "core_object_pcap_t*" +_cast[Object.ETHER] = "core_object_ether_t*" +_cast[Object.NULL] = "core_object_null_t*" +_cast[Object.LOOP] = "core_object_loop_t*" +_cast[Object.LINUXSLL] = "core_object_linuxsll_t*" +_cast[Object.IEEE802] = "core_object_ieee802_t*" +_cast[Object.GRE] = "core_object_gre_t*" +_cast[Object.IP] = "core_object_ip_t*" +_cast[Object.IP6] = "core_object_ip6_t*" +_cast[Object.ICMP] = "core_object_icmp_t*" +_cast[Object.ICMP6] = "core_object_icmp6_t*" +_cast[Object.UDP] = "core_object_udp_t*" +_cast[Object.TCP] = "core_object_tcp_t*" +_cast[Object.PAYLOAD] = "core_object_payload_t*" +_cast[Object.DNS] = "core_object_dns_t*" + +-- Cast the object to the underlining object module and return it. +function Object:cast() + return ffi.cast(_cast[self.obj_type], self) +end + +-- Cast the object to the specified object module and return it. +-- Returns nil if the object chain doesn't contained the specified object type. +function Object:cast_to(obj_type) + if obj_type == nil then + obj_type = self.obj_type + end + + local obj = self + while obj.obj_type ~= obj_type do + obj = obj.obj_prev + if obj == nil then return nil end + end + + return ffi.cast(_cast[obj_type], obj) +end + +-- Cast the object to the generic object module and return it. +function Object:uncast() + return self +end + +-- Make a copy of the object and return it. +function Object:copy() + return C.core_object_copy(self) +end + +-- Free the object, should only be used on copies or otherwise allocated. +function Object:free() + C.core_object_free(self) +end + +core_object_t = ffi.metatype(t_name, { __index = Object }) + +-- dnsjit.core.object.pcap (3), +-- dnsjit.core.object.ether (3), +-- dnsjit.core.object.null (3), +-- dnsjit.core.object.loop (3), +-- dnsjit.core.object.linuxsll (3), +-- dnsjit.core.object.ieee802 (3), +-- dnsjit.core.object.gre (3), +-- dnsjit.core.object.ip (3), +-- dnsjit.core.object.ip6 (3), +-- dnsjit.core.object.icmp (3), +-- dnsjit.core.object.icmp6 (3), +-- dnsjit.core.object.udp (3), +-- dnsjit.core.object.tcp (3), +-- dnsjit.core.object.payload (3), +-- dnsjit.core.object.dns (3) +return Object |