forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This will make it easier to determine protocol dependencies. Some LLC OUI dissector tables didn't have an associated protocol, so they were left without one (-1 used) Change-Id: I6339f16476510ef3f393d6fb5d8946419bfb4b7d Reviewed-on: https://code.wireshark.org/review/14446 Reviewed-by: Michael Mann <mmann78@netscape.net>
682 lines
19 KiB
C
682 lines
19 KiB
C
/*
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* packet-raknet.c
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*
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* Routines for RakNet protocol packet disassembly.
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*
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* Ref: https://github.com/OculusVR/RakNet
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*
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* Nick Carter <ncarter100@gmail.com>
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* Copyright 2014 Nick Carter
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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/*
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* RAKNET Protocol Constants.
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*/
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#define RAKNET_MAGIC 0x00ffff00fefefefefdfdfdfd12345678
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#define RAKNET_SECURITY_AND_COOKIE 0x043f57fefd
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static int proto_raknet = -1;
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static gint ett_raknet = -1; /* Should this node be expanded */
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/*
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* Dissectors
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*/
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static dissector_table_t raknet_dissector_table;
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static expert_field ei_raknet_uknown_id = EI_INIT;
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/*
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* First byte gives us the packet id
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*/
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static int hf_raknet_packet_id = -1;
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/*
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* General fields (fields that are in >1 packet types.
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*/
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static int hf_raknet_general_client_id = -1;
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static int hf_raknet_general_elapsed_time = -1;
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static int hf_raknet_general_magic = -1;
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static int hf_raknet_general_mtu_size = -1;
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static int hf_raknet_general_raknet_proto_ver = -1;
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static int hf_raknet_general_security = -1;
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static int hf_raknet_general_server_id = -1;
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static int hf_raknet_general_udp_port = -1;
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/*
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* Fields specific to a packet id type
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*/
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static int hf_raknet_0x05_null_padding = -1;
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static int hf_raknet_0x06_server_security = -1;
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static int hf_raknet_0x07_cookie = -1;
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static int hf_raknet_0x1C_server_id_str_len = -1;
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static int hf_raknet_0x1C_server_id_str = -1;
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/*
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* Forward declaration.
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*/
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void proto_register_raknet(void);
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void proto_reg_handoff_raknet(void);
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static proto_tree *init_raknet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint *offset);
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struct raknet_handler_entry {
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value_string vs;
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dissector_t dissector_fp;
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};
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static int
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raknet_dissect_0x00(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_elapsed_time, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x01(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_elapsed_time, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x02(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_elapsed_time, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x05(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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offset += item_size;
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item_size = 1;
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proto_tree_add_item(sub_tree, hf_raknet_general_raknet_proto_ver, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = -1; /* -1 read to end of tvb buffer */
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proto_tree_add_item(sub_tree, hf_raknet_0x05_null_padding, tvb, offset,
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item_size, ENC_NA);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x06(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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offset += item_size;
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_server_id, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 1;
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proto_tree_add_item(sub_tree, hf_raknet_0x06_server_security, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 2;
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proto_tree_add_item(sub_tree, hf_raknet_general_mtu_size, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x07(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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offset += item_size;
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item_size = 1;
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proto_tree_add_item(sub_tree, hf_raknet_general_security, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 4;
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proto_tree_add_item(sub_tree, hf_raknet_0x07_cookie, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 2;
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proto_tree_add_item(sub_tree, hf_raknet_general_udp_port, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 2;
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proto_tree_add_item(sub_tree, hf_raknet_general_mtu_size, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_client_id, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x08(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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offset += item_size;
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_server_id, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 1;
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proto_tree_add_item(sub_tree, hf_raknet_general_security, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 4;
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proto_tree_add_item(sub_tree, hf_raknet_0x07_cookie, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 2;
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proto_tree_add_item(sub_tree, hf_raknet_general_udp_port, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 2;
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proto_tree_add_item(sub_tree, hf_raknet_general_mtu_size, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 1;
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proto_tree_add_item(sub_tree, hf_raknet_general_security, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x19(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 1;
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proto_tree_add_item(sub_tree, hf_raknet_general_raknet_proto_ver, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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offset += item_size;
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_server_id, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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}
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return tvb_reported_length(tvb);
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}
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static int
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raknet_dissect_0x1C(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_tree *sub_tree;
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gint item_size;
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gint str_size;
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gint offset;
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sub_tree = init_raknet(tvb, pinfo, tree, &offset);
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if (sub_tree != NULL) {
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_elapsed_time, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 8;
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proto_tree_add_item(sub_tree, hf_raknet_general_server_id, tvb, offset,
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item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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item_size = 16;
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proto_tree_add_item(sub_tree, hf_raknet_general_magic, tvb, offset,
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item_size, ENC_NA);
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offset += item_size;
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/* raknet precedes strings with a short (2 bytes) holding string length. */
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str_size = tvb_get_ntohs(tvb, offset);
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item_size = 2;
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proto_tree_add_item(sub_tree, hf_raknet_0x1C_server_id_str_len, tvb,
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offset, item_size, ENC_BIG_ENDIAN);
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offset += item_size;
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proto_tree_add_item(sub_tree, hf_raknet_0x1C_server_id_str, tvb, offset,
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str_size, ENC_NA|ENC_ASCII);
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}
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return tvb_reported_length(tvb);
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}
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/*
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* Protocol definition and handlers.
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*/
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static const struct raknet_handler_entry raknet_handler[] = {
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/*
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* Ref: ..RakNet/Source/MessageIdentifiers.h
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*/
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{ { 0x0, "ID_CONNECTED_PING" },
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raknet_dissect_0x00 },
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{ { 0x1, "ID_UNCONNECTED_PING" },
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raknet_dissect_0x01 },
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{ { 0x2, "ID_UNCONNECTED_PING_OPEN_CONNECTIONS" },
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raknet_dissect_0x02 },
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{ { 0x5, "ID_OPEN_CONNECTION_REQUEST_1" },
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raknet_dissect_0x05 },
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{ { 0x6, "ID_OPEN_CONNECTION_REPLY_1" },
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raknet_dissect_0x06 },
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{ { 0x7, "ID_OPEN_CONNECTION_REQUEST_2" },
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raknet_dissect_0x07 },
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{ { 0x8, "ID_OPEN_CONNECTION_REPLY_2" },
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raknet_dissect_0x08 },
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{ { 0x19, "ID_INCOMPATIBLE_PROTOCOL_VERSION" },
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raknet_dissect_0x19 },
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{ { 0x1C, "ID_UNCONNECTED_PONG" },
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raknet_dissect_0x1C },
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};
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#define RAKNET_PACKET_ID_COUNT \
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(sizeof(raknet_handler) / sizeof(raknet_handler[0]))
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/*
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* Look up packet id to packet name, value_string is wireshark type.
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*/
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static value_string packet_names[RAKNET_PACKET_ID_COUNT+1];
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static void
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raknet_init_packet_names(void)
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{
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unsigned int i;
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for (i = 0; i < RAKNET_PACKET_ID_COUNT; i++) {
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packet_names[i].value = raknet_handler[i].vs.value;
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packet_names[i].strptr = raknet_handler[i].vs.strptr;
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}
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packet_names[RAKNET_PACKET_ID_COUNT].value = 0;
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packet_names[RAKNET_PACKET_ID_COUNT].strptr = NULL;
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}
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/*
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* Fill out the Info column and protocol subtree.
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*
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* Offset is updated for the caller.
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*/
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static proto_tree *
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init_raknet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint *offset)
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{
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proto_tree *sub_tree;
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proto_item *ti;
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guint8 packet_id;
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*offset = 0;
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/*
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* Take buffer start 0 to end -1 as single raknet item.
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*/
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ti = proto_tree_add_item(tree, proto_raknet, tvb, 0, -1, ENC_NA);
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sub_tree = proto_item_add_subtree(ti, ett_raknet);
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packet_id = tvb_get_guint8(tvb, *offset);
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proto_tree_add_item(sub_tree, hf_raknet_packet_id, tvb, *offset,
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1, ENC_BIG_ENDIAN);
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*offset += 1;
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
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val_to_str(packet_id, packet_names, "Unknown (%#x)"));
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/*
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* Append description to the raknet item.
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*/
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proto_item_append_text(ti, ", Packet id %#x", packet_id);
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return sub_tree;
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}
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/*
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* Decode the tvb buffer.
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*
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* RakNet is just a dissector. It is invoked by protocols whose applications
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* are built using the RakNet libs.
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*/
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static int
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dissect_raknet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint8 packet_id;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RAKNET");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
packet_id = tvb_get_guint8(tvb, 0);
|
|
|
|
if (!dissector_try_uint_new(raknet_dissector_table, packet_id, tvb,
|
|
pinfo, tree, TRUE, NULL)) {
|
|
proto_tree_add_expert(tree, pinfo, &ei_raknet_uknown_id, tvb,
|
|
0, 1);
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
void
|
|
proto_register_raknet(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
/*
|
|
* Packet ID field.
|
|
*/
|
|
{ &hf_raknet_packet_id,
|
|
{ "RAKNET Packet ID", "raknet.id",
|
|
FT_UINT8, BASE_HEX,
|
|
VALS(packet_names), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
/*
|
|
* General fields (fields in >1 packet).
|
|
*/
|
|
{ &hf_raknet_general_client_id,
|
|
{ "RAKNET Client ID", "raknet.client_id",
|
|
FT_UINT64, BASE_HEX,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_elapsed_time,
|
|
{ "RAKNET time since start (ms)", "raknet.elapsed_time",
|
|
FT_UINT64, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_magic,
|
|
{ "RAKNET magic", "raknet.con_pingopen_magic",
|
|
FT_BYTES, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_mtu_size,
|
|
{ "RAKNET MTU size", "raknet.MTU_size",
|
|
FT_UINT16, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_raknet_proto_ver,
|
|
{ "RAKNET RakNet protocol version", "raknet.proto_ver",
|
|
FT_UINT8, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_server_id,
|
|
{ "RAKNET Server ID", "raknet.server_id",
|
|
FT_UINT64, BASE_HEX,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_security,
|
|
{ "RAKNET security", "raknet.security",
|
|
FT_UINT8, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_general_udp_port,
|
|
{ "RAKNET UDP port", "raknet.UDP_port",
|
|
FT_UINT16, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
/*
|
|
* Packet ID 0x05
|
|
*/
|
|
{ &hf_raknet_0x05_null_padding,
|
|
{ "RAKNET Null padding", "raknet.null_padding",
|
|
FT_BYTES, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
/*
|
|
* Packet ID 0x06
|
|
*/
|
|
{ &hf_raknet_0x06_server_security,
|
|
{ "RAKNET Server security", "raknet.server_security",
|
|
FT_UINT8, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
/*
|
|
* Packet ID 0x07
|
|
*/
|
|
{ &hf_raknet_0x07_cookie,
|
|
{ "RAKNET cookie", "raknet.cookie",
|
|
FT_UINT32, BASE_HEX,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
/*
|
|
* Packet ID 0x1C
|
|
*/
|
|
{ &hf_raknet_0x1C_server_id_str_len,
|
|
{ "RAKNET Server ID string len", "raknet.server_id_str_len",
|
|
FT_UINT16, BASE_DEC,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_raknet_0x1C_server_id_str,
|
|
{ "RAKNET Server ID string", "raknet.server_id_str",
|
|
FT_STRING, BASE_NONE,
|
|
NULL, 0x0,
|
|
NULL, HFILL }
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Setup protocol subtree array
|
|
*/
|
|
static gint *ett[] = {
|
|
&ett_raknet,
|
|
};
|
|
|
|
/*
|
|
* Set up expert info.
|
|
*/
|
|
static ei_register_info ei[] = {
|
|
{ &ei_raknet_uknown_id, { "raknet.unknown.id", PI_UNDECODED, PI_ERROR,
|
|
"RakNet unknown or not implemented packet id",
|
|
EXPFILL }
|
|
}
|
|
};
|
|
expert_module_t *expert_raknet;
|
|
|
|
/*
|
|
* Init data structs.
|
|
*/
|
|
raknet_init_packet_names();
|
|
|
|
/*
|
|
* Register expert support.
|
|
*/
|
|
expert_raknet = expert_register_protocol(proto_raknet);
|
|
expert_register_field_array(expert_raknet, ei, array_length(ei));
|
|
|
|
/*
|
|
* Register the protocol with wireshark.
|
|
*/
|
|
proto_raknet = proto_register_protocol (
|
|
"RAKNET game libs", /* name */
|
|
"RAKNET", /* short name */
|
|
"raknet" /* abbrev */
|
|
);
|
|
|
|
/*
|
|
* Register detailed dissection arrays.
|
|
*/
|
|
proto_register_field_array(proto_raknet, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
raknet_dissector_table =
|
|
register_dissector_table("raknet.packet_id", "RakNet libs packet ids",
|
|
proto_raknet, FT_UINT8, BASE_HEX, DISSECTOR_TABLE_ALLOW_DUPLICATE);
|
|
/*
|
|
* Raknet subdissector for use by external protocols.
|
|
*/
|
|
register_dissector("raknet", dissect_raknet, proto_raknet);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_raknet(void)
|
|
{
|
|
dissector_handle_t raknet_handle_tmp;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < RAKNET_PACKET_ID_COUNT; i++) {
|
|
raknet_handle_tmp =
|
|
create_dissector_handle(raknet_handler[i].dissector_fp,
|
|
proto_raknet);
|
|
dissector_add_uint("raknet.packet_id", raknet_handler[i].vs.value,
|
|
raknet_handle_tmp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|