2ab4155794
Also some other tricks to remove unnecessary tvb_get_string_enc calls. Change-Id: I2f40d9175b6c0bb0b1364b4089bfaa287edf0914 Reviewed-on: https://code.wireshark.org/review/16158 Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net> Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
507 lines
17 KiB
C
507 lines
17 KiB
C
/* packet-tcpros.c
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* Routines for Robot Operating System TCP protocol (TCPROS)
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* Copyright 2015, Guillaume Autran (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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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/prefs.h>
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#include "packet-tcp.h"
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#define SIZE_OF_LENGTH_FIELD 4
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#define SIZE_OF_LENGTH_STAMP (4 + 4)
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void proto_register_tcpros(void);
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void proto_reg_handoff_tcpros(void);
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static int proto_tcpros = -1;
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/** desegmentation of TCPROS over TCP */
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static gboolean tcpros_desegment = TRUE;
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static int hf_tcpros_connection_header = -1;
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static int hf_tcpros_connection_header_length = -1;
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static int hf_tcpros_connection_header_content = -1;
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static int hf_tcpros_connection_header_field = -1;
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static int hf_tcpros_connection_header_field_length = -1;
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static int hf_tcpros_connection_header_field_data = -1;
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static int hf_tcpros_connection_header_field_name = -1;
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static int hf_tcpros_connection_header_field_value = -1;
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static int hf_tcpros_message = -1;
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static int hf_tcpros_message_length = -1;
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static int hf_tcpros_message_body = -1;
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static int hf_tcpros_message_header = -1;
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static int hf_tcpros_message_header_seq = -1;
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static int hf_tcpros_message_header_stamp = -1;
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static int hf_tcpros_message_header_stamp_sec = -1;
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static int hf_tcpros_message_header_stamp_nsec = -1;
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static int hf_tcpros_message_header_frame = -1;
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static int hf_tcpros_message_header_frame_length = -1;
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static int hf_tcpros_message_header_frame_value = -1;
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static int hf_tcpros_message_payload = -1;
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static gint ett_tcpros = -1;
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/**
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* This is the ROS connection header dissector. The general packet format is described
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* here: http://wiki.ros.org/ROS/TCPROS
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* In short, a connection header looks like such: '4-byte length + [4-byte field length + "field=value" ]*'
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*/
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static gint
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dissect_ros_connection_header_field(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint offset)
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{
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proto_item *ti;
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proto_tree *field_tree;
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guint32 fLen = 0;
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gint sep, ret = 0;
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/** Do we have enough for a length field? (ie: 4 bytes) */
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if( tvb_reported_length_remaining(tvb, offset) > SIZE_OF_LENGTH_FIELD ) {
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/** Get the length of the next field */
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fLen = tvb_get_letohl(tvb, offset);
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/** Display the field as a utf-8 string */
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ti = proto_tree_add_item(tree, hf_tcpros_connection_header_field, tvb, offset, SIZE_OF_LENGTH_FIELD, ENC_UTF_8|ENC_LITTLE_ENDIAN);
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field_tree = proto_item_add_subtree(ti, ett_tcpros);
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proto_tree_add_item(field_tree, hf_tcpros_connection_header_field_length, tvb, offset, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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offset += SIZE_OF_LENGTH_FIELD;
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ti = proto_tree_add_item(field_tree, hf_tcpros_connection_header_field_data, tvb, offset, fLen, ENC_UTF_8|ENC_NA);
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/** Look for the '=' separator */
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sep = (tvb_find_guint8(tvb, offset, fLen, '=') - offset);
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/** If we find a separator, then split field name and value */
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if( sep > 0 ) {
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const guint8* field;
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field_tree = proto_item_add_subtree(ti, ett_tcpros);
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proto_tree_add_item_ret_string(field_tree, hf_tcpros_connection_header_field_name, tvb, offset, sep, ENC_UTF_8|ENC_NA, wmem_packet_scope(), &field);
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proto_tree_add_item(field_tree, hf_tcpros_connection_header_field_value, tvb, offset+sep+1, fLen - sep - 1, ENC_UTF_8|ENC_NA);
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col_append_str(pinfo->cinfo, COL_INFO, field);
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}
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ret = fLen + SIZE_OF_LENGTH_FIELD;
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}
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return ret;
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}
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static gint
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dissect_ros_connection_header(tvbuff_t *tvb, proto_tree *root_tree, packet_info *pinfo, gint offset)
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{
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proto_item *ti;
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proto_tree *sub_tree;
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gint consumed_len = 0;
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guint32 header_len = tvb_get_letohl(tvb, offset);
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col_append_str(pinfo->cinfo, COL_INFO, "[ROS Conn] Metadata: [");
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/** We got a connection header */
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ti = proto_tree_add_item(root_tree, hf_tcpros_connection_header, tvb, offset, SIZE_OF_LENGTH_FIELD, ENC_NA|ENC_LITTLE_ENDIAN);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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proto_tree_add_item(sub_tree, hf_tcpros_connection_header_length, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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consumed_len += SIZE_OF_LENGTH_FIELD;
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ti = proto_tree_add_item(sub_tree, hf_tcpros_connection_header_content, tvb, offset + consumed_len, header_len, ENC_NA);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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header_len += SIZE_OF_LENGTH_FIELD;
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while( consumed_len < (gint)header_len ) {
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gint len = dissect_ros_connection_header_field(tvb, sub_tree, pinfo, offset + consumed_len);
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consumed_len += len;
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if( len == 0 ) {
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break;
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}
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if( consumed_len < (gint)header_len ) {
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col_append_str(pinfo->cinfo, COL_INFO, ",");
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}
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}
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col_append_str(pinfo->cinfo, COL_INFO, "]");
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return consumed_len;
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}
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static gint
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dissect_ros_message_header_stamp(tvbuff_t *tvb, proto_tree *root_tree, packet_info *pinfo, gint offset)
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{
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proto_item *ti;
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proto_tree *sub_tree;
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gint consumed_len = 0;
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guint32 sec, nsec;
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ti = proto_tree_add_item(root_tree, hf_tcpros_message_header_stamp, tvb, offset + consumed_len, SIZE_OF_LENGTH_STAMP, ENC_LITTLE_ENDIAN);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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/** Seconds */
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proto_tree_add_item(sub_tree, hf_tcpros_message_header_stamp_sec, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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sec = tvb_get_letohl(tvb, offset + consumed_len);
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consumed_len += SIZE_OF_LENGTH_FIELD;
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col_append_fstr(pinfo->cinfo, COL_INFO, "Sec: %d ", sec);
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/** Nano seconds */
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proto_tree_add_item(sub_tree, hf_tcpros_message_header_stamp_nsec, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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nsec = tvb_get_letohl(tvb, offset + consumed_len);
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consumed_len += SIZE_OF_LENGTH_FIELD;
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col_append_fstr(pinfo->cinfo, COL_INFO, "NSec: %d ", nsec);
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return consumed_len;
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}
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static gint
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dissect_ros_message_header(tvbuff_t *tvb, proto_tree *root_tree, packet_info *pinfo, gint offset)
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{
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proto_item *ti;
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proto_tree *sub_tree;
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gint consumed_len = 0;
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guint32 frame_id_len;
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guint32 seq;
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guint header_len;
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const guint8* frame_str;
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frame_id_len = tvb_get_letohl(tvb, offset + consumed_len + SIZE_OF_LENGTH_FIELD + SIZE_OF_LENGTH_STAMP);
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header_len = SIZE_OF_LENGTH_FIELD + SIZE_OF_LENGTH_STAMP + SIZE_OF_LENGTH_FIELD + frame_id_len;
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/** Header */
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ti = proto_tree_add_item(root_tree, hf_tcpros_message_header, tvb, offset + consumed_len, header_len, ENC_NA);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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/** Sequence number */
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proto_tree_add_item(sub_tree, hf_tcpros_message_header_seq, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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seq = tvb_get_letohl(tvb, offset + consumed_len);
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consumed_len += SIZE_OF_LENGTH_FIELD;
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col_append_fstr(pinfo->cinfo, COL_INFO, "Seq: %d ", seq);
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/** Timestamp */
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consumed_len += dissect_ros_message_header_stamp(tvb, sub_tree, pinfo, offset + consumed_len);
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/** Frame ID */
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ti = proto_tree_add_item(sub_tree, hf_tcpros_message_header_frame, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_UTF_8|ENC_LITTLE_ENDIAN);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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proto_tree_add_item(sub_tree, hf_tcpros_message_header_frame_length, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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consumed_len += SIZE_OF_LENGTH_FIELD;
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proto_tree_add_item_ret_string(sub_tree, hf_tcpros_message_header_frame_value, tvb, offset + consumed_len, frame_id_len, ENC_UTF_8|ENC_NA, wmem_packet_scope(), &frame_str);
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col_append_fstr(pinfo->cinfo, COL_INFO, "Frame: '%s' ", frame_str);
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consumed_len += frame_id_len;
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return consumed_len;
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}
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/**
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* This is the ROS message dissector. A ROS message contains two parts: a msg header; a msg payload.
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* Because the packet is all in binary format, we don't really know the payload format (we don't know the payload type either).
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* However, every packet has the same header as defined here: http://docs.ros.org/api/std_msgs/html/msg/Header.html
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* So, we can break this one down and display it.
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*/
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static gint
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dissect_ros_message(tvbuff_t *tvb, proto_tree *root_tree, packet_info *pinfo, gint offset)
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{
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proto_item *ti;
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proto_tree *sub_tree;
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gint consumed_len = 0;
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guint32 total_len = tvb_get_letohl(tvb, offset);
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guint payload_len;
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col_append_str(pinfo->cinfo, COL_INFO, "[ROS Msg] ");
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/** We got a ROS msg */
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ti = proto_tree_add_item(root_tree, hf_tcpros_message, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_NA | ENC_LITTLE_ENDIAN);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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proto_tree_add_item(sub_tree, hf_tcpros_message_length, tvb, offset + consumed_len, SIZE_OF_LENGTH_FIELD, ENC_LITTLE_ENDIAN);
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consumed_len += SIZE_OF_LENGTH_FIELD;
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/** Body */
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ti = proto_tree_add_item(sub_tree, hf_tcpros_message_body, tvb, offset + consumed_len, total_len, ENC_NA);
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sub_tree = proto_item_add_subtree(ti, ett_tcpros);
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/** Body.Header */
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consumed_len += dissect_ros_message_header(tvb, sub_tree, pinfo, offset + consumed_len);
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/** Body.Payload */
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payload_len = (total_len + SIZE_OF_LENGTH_FIELD) - consumed_len;
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proto_tree_add_item(sub_tree, hf_tcpros_message_payload, tvb, offset + consumed_len, payload_len, ENC_NA);
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consumed_len += payload_len;
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return consumed_len;
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}
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/**
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* This is the poor man's way to differentiate between a connection header packet and a message packet.
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*/
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static gboolean
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is_connection_header(tvbuff_t *tvb, packet_info *pinfo _U_ , guint offset)
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{
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gboolean is_con_header = FALSE;
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guint32 len1 = tvb_get_letohl(tvb, offset);
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guint32 len2 = tvb_get_letohl(tvb, offset + SIZE_OF_LENGTH_FIELD);
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if( len1 > len2 ) {
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is_con_header = TRUE;
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}
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return is_con_header;
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}
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static void
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dissect_ros_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean is_tcp _U_ )
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{
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proto_item *ti;
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proto_tree *root_tree;
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guint offset;
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/** Clear out stuff in the info column */
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_tcpros, tvb, 0, -1, ENC_NA);
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root_tree = proto_item_add_subtree(ti, ett_tcpros);
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offset = 0;
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while(offset < tvb_reported_length(tvb)) {
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gint available = tvb_reported_length_remaining(tvb, offset);
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if( (available < SIZE_OF_LENGTH_FIELD) || ((guint)available < tvb_get_letohl(tvb, offset)) ) {
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/** we ran out of data: ask for more */
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
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return;
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}
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/** There are two types of packet: Connection Headers and ROS Message. Which one is it? */
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if( is_connection_header(tvb, pinfo, offset) ) {
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/** We have a ROS connection header. */
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offset += dissect_ros_connection_header(tvb, root_tree, pinfo, offset);
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} else {
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/** We have a ROS message. */
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offset += dissect_ros_message(tvb, root_tree, pinfo, offset);
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}
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}
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}
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static guint
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get_tcpros_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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{
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guint32 plen;
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/*
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* Get the length of the TCPROS packet.
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*/
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plen = tvb_get_letohl(tvb, offset);
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/*
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* That length doesn't include the length field itself; add that in.
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*/
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return plen + SIZE_OF_LENGTH_FIELD;
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}
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static int
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dissect_tcpros_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TCPROS");
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dissect_ros_common(tvb, pinfo, tree, TRUE);
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return tvb_reported_length(tvb);
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}
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static int
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dissect_tcpros(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, tcpros_desegment, SIZE_OF_LENGTH_FIELD, get_tcpros_pdu_len,
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dissect_tcpros_pdu, data);
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return tvb_reported_length(tvb);
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}
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void
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proto_register_tcpros(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tcpros_connection_header, { "ROS Connection", "tcpros.header",
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FT_UINT_BYTES, BASE_NONE, NULL, 0,
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"Message Header", HFILL } },
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{ &hf_tcpros_connection_header_length, { "Header Length", "tcpros.header_length",
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FT_UINT32, BASE_DEC, NULL, 0,
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"Message Header Length", HFILL } },
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{ &hf_tcpros_connection_header_content, { "Header Content", "tcpros.header_content",
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FT_BYTES, BASE_NONE, NULL, 0,
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"Message Header Content", HFILL } },
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{ &hf_tcpros_connection_header_field, { "Field", "tcpros.header_field",
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FT_UINT_STRING, BASE_NONE, NULL, 0,
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"Message Header Field", HFILL } },
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{ &hf_tcpros_connection_header_field_length, { "Field Length", "tcpros.header_field_length",
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FT_UINT32, BASE_DEC, NULL, 0,
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"Message Header Field Length", HFILL } },
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{ &hf_tcpros_connection_header_field_data, { "Field Content", "tcpros.header_field_data",
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FT_STRING, BASE_NONE, NULL, 0,
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"Message Header Field Content", HFILL } },
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{ &hf_tcpros_connection_header_field_name, { "Name", "tcpros.header_field_name",
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FT_STRING, BASE_NONE, NULL, 0,
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"Message Header Field Name", HFILL } },
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{ &hf_tcpros_connection_header_field_value, { "Value", "tcpros.header_field_value",
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FT_STRING, BASE_NONE, NULL, 0,
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"Message Header Field Value", HFILL } },
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{ &hf_tcpros_message, { "ROS Message", "tcpros.message",
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FT_UINT_BYTES, BASE_NONE, NULL, 0,
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"ROS Message Packet", HFILL } },
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{ &hf_tcpros_message_length, { "Message Length", "tcpros.message.length",
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FT_UINT32, BASE_DEC, NULL, 0,
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"ROS Message Packet length", HFILL } },
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{ &hf_tcpros_message_body, { "Message Content", "tcpros.message.body",
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FT_BYTES, BASE_NONE, NULL, 0,
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"ROS Message Packet Body", HFILL } },
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{ &hf_tcpros_message_header, { "Header", "tcpros.message.header",
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FT_BYTES, BASE_NONE, NULL, 0,
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"ROS Message Header", HFILL } },
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{ &hf_tcpros_message_header_seq, { "Sequence ID", "tcpros.message.header.seq",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
"ROS Message Header Sequence", HFILL } },
|
|
{ &hf_tcpros_message_header_stamp, { "Timestamp", "tcpros.message.header.stamp",
|
|
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0,
|
|
"ROS Message Header Stamp", HFILL } },
|
|
|
|
{ &hf_tcpros_message_header_stamp_sec, { "Seconds", "tcpros.message.header.stamp.sec",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
"ROS Message Header Stamp Sec", HFILL } },
|
|
|
|
{ &hf_tcpros_message_header_stamp_nsec, { "Nanoseconds", "tcpros.message.header.stamp.nsec",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
"ROS Message Header Stamp NSec", HFILL } },
|
|
|
|
|
|
{ &hf_tcpros_message_header_frame, { "Frame ID", "tcpros.message.header.frame",
|
|
FT_UINT_STRING, BASE_NONE, NULL, 0,
|
|
"ROS Message Header Frame ID", HFILL } },
|
|
|
|
{ &hf_tcpros_message_header_frame_length, { "Length", "tcpros.message.header.frame.len",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
"ROS Message Header Frame ID Length", HFILL } },
|
|
|
|
{ &hf_tcpros_message_header_frame_value, { "Value", "tcpros.message.header.frame.value",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
"ROS Message Header Frame ID Value", HFILL } },
|
|
|
|
|
|
{ &hf_tcpros_message_payload, { "Payload", "tcpros.message.payload",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
"ROS Message Packet Payload", HFILL } },
|
|
|
|
|
|
|
|
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_tcpros,
|
|
};
|
|
|
|
module_t *tcpros_module;
|
|
|
|
proto_tcpros = proto_register_protocol("TCP based Robot Operating System protocol (TCPROS)", "TCPROS", "tcpros");
|
|
|
|
proto_register_field_array(proto_tcpros, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
tcpros_module = prefs_register_protocol(proto_tcpros, proto_reg_handoff_tcpros);
|
|
|
|
prefs_register_bool_preference(tcpros_module, "desegment_tcpros_messages",
|
|
"Reassemble TCPROS messages spanning multiple TCP segments",
|
|
"Whether the TCPROS dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&tcpros_desegment);
|
|
|
|
|
|
}
|
|
|
|
|
|
void
|
|
proto_reg_handoff_tcpros(void)
|
|
{
|
|
static dissector_handle_t tcpros_handle;
|
|
static gboolean Initialized = FALSE;
|
|
|
|
if (!Initialized) {
|
|
tcpros_handle = create_dissector_handle(dissect_tcpros, proto_tcpros);
|
|
dissector_add_for_decode_as("tcp.port", tcpros_handle); /* for "decode-as" */
|
|
Initialized = TRUE;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|