2015-01-05 19:41:45 +00:00
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/* packet-dji-uav.c
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* Routines for the disassembly of the command protocol for the
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* DJI Phantom 2 Vision+ UAV
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* http://www.dji.com/product/phantom-2-vision-plus
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* and possibly others.
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*
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* Copyright 2014,2015 Joerg Mayer (see AUTHORS file)
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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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/*
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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/* TCP desegmentation */
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#include "packet-tcp.h"
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/* Request Response tracking */
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#include <epan/conversation.h>
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#include <epan/prefs.h>
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void proto_register_djiuav(void);
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void proto_reg_handoff_djiuav(void);
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/* Enable desegmentation of djiuav over TCP */
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static gboolean djiuav_desegment = TRUE;
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/* Command/Response tracking */
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typedef struct _djiuav_conv_info_t {
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wmem_map_t *pdus;
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} djiuav_conv_info_t;
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typedef struct _djiuav_transaction_t {
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guint16 seqno;
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guint8 command;
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guint32 request_frame;
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guint32 reply_frame;
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nstime_t request_time;
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} djiuav_transaction_t;
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/* Finally: Protocol specific stuff */
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/* protocol handles */
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static int proto_djiuav = -1;
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/* ett handles */
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static int ett_djiuav = -1;
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/* hf elements */
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static int hf_djiuav_magic = -1;
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static int hf_djiuav_length = -1;
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static int hf_djiuav_flags = -1;
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static int hf_djiuav_seqno = -1;
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static int hf_djiuav_cmd = -1;
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static int hf_djiuav_checksum = -1;
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2015-01-06 20:28:56 +00:00
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#if 0
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2015-01-05 19:41:45 +00:00
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static int hf_djiuav_cmd04_unknown = -1;
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static int hf_djiuav_resp04_unknown = -1;
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2015-01-06 20:28:56 +00:00
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#endif
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2015-01-05 19:41:45 +00:00
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static int hf_djiuav_cmd20_unknown = -1;
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2015-01-06 20:28:56 +00:00
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#if 0
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2015-01-05 19:41:45 +00:00
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static int hf_djiuav_resp20_unknown = -1;
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2015-01-06 20:28:56 +00:00
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#endif
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2015-01-05 19:41:45 +00:00
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static int hf_djiuav_cmdunk = -1;
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static int hf_djiuav_respunk = -1;
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static int hf_djiuav_extradata = -1;
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/* hf request/response tracking */
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static int hf_djiuav_response_in = -1;
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static int hf_djiuav_response_to = -1;
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static int hf_djiuav_response_time = -1;
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#define PROTO_SHORT_NAME "DJIUAV"
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#define PROTO_LONG_NAME "DJI UAV Drone Control Protocol"
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#define PORT_DJIUAV 2001
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static const value_string djiuav_pdu_type[] = {
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{ 0x20, "Set Time" },
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{ 0, NULL }
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};
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static void
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request_response_handling(tvbuff_t *tvb, packet_info *pinfo, proto_tree *djiuav_tree,
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guint32 offset)
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{
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conversation_t *conversation;
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djiuav_conv_info_t *djiuav_info;
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djiuav_transaction_t *djiuav_trans;
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guint16 seq_no;
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gboolean is_cmd;
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guint8 packet_type;
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is_cmd = (pinfo->match_uint == pinfo->destport);
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seq_no = tvb_get_letohs(tvb, offset + 4);
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packet_type = tvb_get_guint8(tvb, offset + 6);
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conversation = find_or_create_conversation(pinfo);
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djiuav_info = (djiuav_conv_info_t *)conversation_get_proto_data(conversation, proto_djiuav);
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if (!djiuav_info) {
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djiuav_info = wmem_new(wmem_file_scope(), djiuav_conv_info_t);
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djiuav_info->pdus=wmem_map_new(wmem_file_scope(), g_direct_hash, g_direct_equal);
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conversation_add_proto_data(conversation, proto_djiuav, djiuav_info);
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}
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if (!pinfo->fd->flags.visited) {
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if (is_cmd) {
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djiuav_trans=wmem_new(wmem_file_scope(), djiuav_transaction_t);
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2016-01-24 03:40:51 +00:00
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djiuav_trans->request_frame=pinfo->num;
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2015-01-05 19:41:45 +00:00
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djiuav_trans->reply_frame=0;
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2016-01-23 03:50:21 +00:00
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djiuav_trans->request_time=pinfo->abs_ts;
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2015-01-05 19:41:45 +00:00
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djiuav_trans->seqno=seq_no;
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djiuav_trans->command=packet_type;
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2015-01-05 21:18:26 +00:00
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wmem_map_insert(djiuav_info->pdus, GUINT_TO_POINTER((guint)seq_no), (void *)djiuav_trans);
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2015-01-05 19:41:45 +00:00
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} else {
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2015-01-05 21:18:26 +00:00
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djiuav_trans=(djiuav_transaction_t *)wmem_map_lookup(djiuav_info->pdus, GUINT_TO_POINTER((guint)seq_no));
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2015-01-05 19:41:45 +00:00
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if (djiuav_trans) {
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/* Special case: djiuav seems to send 0x24 replies with seqno 0 and without a request */
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if (djiuav_trans->reply_frame == 0)
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2016-01-24 03:40:51 +00:00
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djiuav_trans->reply_frame=pinfo->num;
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2015-01-05 19:41:45 +00:00
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}
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}
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} else {
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2015-01-05 21:18:26 +00:00
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djiuav_trans=(djiuav_transaction_t *)wmem_map_lookup(djiuav_info->pdus, GUINT_TO_POINTER((guint)seq_no));
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2015-01-05 19:41:45 +00:00
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}
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/* djiuav_trans may be 0 in case it's a reply without a matching request */
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if (djiuav_tree && djiuav_trans) {
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if (is_cmd) {
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if (djiuav_trans->reply_frame) {
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proto_item *it;
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it = proto_tree_add_uint(djiuav_tree, hf_djiuav_response_in,
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tvb, 0, 0, djiuav_trans->reply_frame);
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PROTO_ITEM_SET_GENERATED(it);
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}
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} else {
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if (djiuav_trans->request_frame) {
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proto_item *it;
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nstime_t ns;
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it = proto_tree_add_uint(djiuav_tree, hf_djiuav_response_to,
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tvb, 0, 0, djiuav_trans->request_frame);
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PROTO_ITEM_SET_GENERATED(it);
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2016-01-23 03:50:21 +00:00
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nstime_delta(&ns, &pinfo->abs_ts, &djiuav_trans->request_time);
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2015-01-05 19:41:45 +00:00
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it = proto_tree_add_time(djiuav_tree, hf_djiuav_response_time, tvb, 0, 0, &ns);
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PROTO_ITEM_SET_GENERATED(it);
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}
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}
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}
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}
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static int
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dissect_djiuav_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *ti;
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proto_tree *djiuav_tree = NULL;
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guint32 offset = 0;
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guint32 pdu_length;
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guint8 packet_type;
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gboolean is_cmd;
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is_cmd = (pinfo->match_uint == pinfo->destport);
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packet_type = tvb_get_guint8(tvb, 6);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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col_add_str(pinfo->cinfo, COL_INFO, is_cmd?"C: ":"R: ");
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col_append_str(pinfo->cinfo, COL_INFO, val_to_str(packet_type,
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djiuav_pdu_type, "Type 0x%02x"));
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ti = proto_tree_add_item(tree, proto_djiuav, tvb, offset, -1, ENC_NA);
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djiuav_tree = proto_item_add_subtree(ti, ett_djiuav);
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request_response_handling(tvb, pinfo, djiuav_tree, offset);
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if (tree) {
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proto_tree_add_item(djiuav_tree, hf_djiuav_magic, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 2;
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pdu_length = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(djiuav_tree, hf_djiuav_length, tvb, offset, 1,
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ENC_NA);
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offset += 1;
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proto_tree_add_item(djiuav_tree, hf_djiuav_flags, tvb, offset, 1,
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ENC_NA);
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offset += 1;
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proto_tree_add_item(djiuav_tree, hf_djiuav_seqno, tvb, offset, 2,
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ENC_LITTLE_ENDIAN);
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offset += 2;
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proto_tree_add_item(djiuav_tree, hf_djiuav_cmd, tvb, offset, 1,
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ENC_NA);
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offset += 1;
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if (is_cmd) { /* Command */
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switch (packet_type) {
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case 0x20: /* Set time */
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/* FIXME: Properly decode this: year(lo) year(hi) month date hour minute second */
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proto_tree_add_item(djiuav_tree, hf_djiuav_cmd20_unknown, tvb, offset, 7,
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ENC_NA);
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offset += 7;
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break;
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default:
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proto_tree_add_item(djiuav_tree, hf_djiuav_cmdunk, tvb, offset, pdu_length - 8,
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ENC_NA);
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offset += (pdu_length - 8);
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break;
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}
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} else { /* Response */
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switch (packet_type) {
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default:
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proto_tree_add_item(djiuav_tree, hf_djiuav_respunk, tvb,
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offset, pdu_length - 8, ENC_NA);
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offset += (pdu_length - 8);
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break;
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}
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}
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if (offset < pdu_length - 1) { /* We guessed wrong about the cmd len */
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proto_tree_add_item(djiuav_tree, hf_djiuav_extradata, tvb, offset,
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pdu_length - 1 - offset, ENC_NA);
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offset += pdu_length - 1 - offset;
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}
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2016-01-06 00:58:42 +00:00
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/* FIXME: calculate XOR and validate transmitted value */
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2015-01-05 19:41:45 +00:00
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proto_tree_add_item(djiuav_tree, hf_djiuav_checksum, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset += 1;
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}
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return offset;
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}
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static gboolean
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test_djiuav(tvbuff_t *tvb)
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{
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/* Minimum of 8 bytes, beginning with magic bytes 0x55BB */
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2015-01-06 20:28:56 +00:00
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if ( tvb_captured_length(tvb) < 8 /* Size of a command with empty data is at least 8 */
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2015-01-05 19:41:45 +00:00
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|| tvb_get_ntohs(tvb, 0) != 0x55BB
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) {
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return FALSE;
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}
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return TRUE;
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}
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/* Get the length of the full pdu */
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static guint
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2015-01-25 19:30:13 +00:00
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get_djiuav_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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2015-01-05 19:41:45 +00:00
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{
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return tvb_get_guint8(tvb, offset + 2);
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}
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static int
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2016-04-15 17:45:28 +00:00
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dissect_djiuav_static(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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2015-01-05 19:41:45 +00:00
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{
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if ( !test_djiuav(tvb) ) {
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return 0;
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}
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tcp_dissect_pdus(tvb, pinfo, tree, djiuav_desegment, 8,
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get_djiuav_pdu_len, dissect_djiuav_pdu, data);
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2015-01-06 20:28:56 +00:00
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return tvb_captured_length(tvb);
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2015-01-05 19:41:45 +00:00
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}
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void
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proto_register_djiuav(void)
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{
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static hf_register_info hf[] = {
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/* DJIUAV header */
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{ &hf_djiuav_magic,
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{ "Protocol Magic", "djiuav.magic", FT_UINT16, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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{ &hf_djiuav_length,
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{ "PDU Length", "djiuav.length", FT_UINT8, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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{ &hf_djiuav_flags,
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{ "Flags", "djiuav.flags", FT_UINT8, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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{ &hf_djiuav_seqno,
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{ "Sequence No", "djiuav.seqno", FT_UINT16, BASE_DEC, NULL,
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0x0, NULL, HFILL }},
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{ &hf_djiuav_cmd,
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{ "PDU Type", "djiuav.pdutype", FT_UINT8, BASE_HEX, VALS(djiuav_pdu_type),
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0x0, NULL, HFILL }},
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{ &hf_djiuav_checksum,
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{ "Checksum", "djiuav.checksum", FT_UINT8, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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/* 0x04 */
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2015-01-06 20:28:56 +00:00
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#if 0
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2015-01-05 19:41:45 +00:00
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{ &hf_djiuav_cmd04_unknown,
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{ "C04 Unknown", "djiuav.cmd04.unknown", FT_UINT8, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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{ &hf_djiuav_resp04_unknown,
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{ "R04 Unknown", "djiuav.resp04.unknown", FT_UINT8, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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2015-01-06 20:28:56 +00:00
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#endif
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2015-01-05 19:41:45 +00:00
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/* Set time */
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{ &hf_djiuav_cmd20_unknown,
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{ "Time in BCD", "djiuav.cmd04.bcdtime", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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2015-01-06 20:28:56 +00:00
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#if 0
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2015-01-05 19:41:45 +00:00
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{ &hf_djiuav_resp20_unknown,
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{ "R20 Unknown", "djiuav.resp04.unknown", FT_UINT8, BASE_HEX, NULL,
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0x0, NULL, HFILL }},
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2015-01-06 20:28:56 +00:00
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#endif
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2015-01-05 19:41:45 +00:00
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/* CMD Unknown */
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{ &hf_djiuav_cmdunk,
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{ "C Unknown", "djiuav.cmd.unknown", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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/* RESP Unknown */
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{ &hf_djiuav_respunk,
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{ "R Unknown", "djiuav.resp.unknown", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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/* Extra Data (unexpected) */
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{ &hf_djiuav_extradata,
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{ "Unexpected", "djiuav.unexpected", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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/* Request - Response tracking */
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{ &hf_djiuav_response_in,
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{ "Response In", "djiuav.response_in", FT_FRAMENUM, BASE_NONE, NULL,
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0x0, "Matching response in frame", HFILL }},
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{ &hf_djiuav_response_to,
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{ "Request In", "djiuav.response_to",
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FT_FRAMENUM, BASE_NONE, NULL,
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0x0, "Matching command in frame", HFILL }},
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{ &hf_djiuav_response_time,
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{ "Response Time", "djiuav.response_time",
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FT_RELATIVE_TIME, BASE_NONE, NULL,
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0x0, "Time between Command and matching Response", HFILL }},
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};
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static gint *ett[] = {
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&ett_djiuav,
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};
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module_t *djiuav_module;
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proto_djiuav = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "djiuav");
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proto_register_field_array(proto_djiuav, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Preferences */
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djiuav_module = prefs_register_protocol(proto_djiuav, NULL);
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2015-01-06 20:28:56 +00:00
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prefs_register_bool_preference(djiuav_module, "desegment",
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2015-01-05 19:41:45 +00:00
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"Reassemble DJIUAV messages",
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2015-01-06 20:28:56 +00:00
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"Whether DJIUAV should reassemble messages spanning multiple"
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2015-01-05 19:41:45 +00:00
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" TCP segments (required to get useful results)",
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&djiuav_desegment);
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}
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void
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proto_reg_handoff_djiuav(void)
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{
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dissector_handle_t djiuav_handle;
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|
2015-12-09 03:49:44 +00:00
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djiuav_handle = create_dissector_handle(dissect_djiuav_static, proto_djiuav);
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2015-01-05 19:41:45 +00:00
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dissector_add_uint("tcp.port", PORT_DJIUAV, djiuav_handle);
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}
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2015-01-06 09:36:37 +00:00
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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