From Adrian Daerr:
I have written a crude dissector of GigE-vision Control Protocol packets. The dissector was written as part of the opengigevision project: http://gitorious.org/opengigevision svn path=/trunk/; revision=32198
This commit is contained in:
Jaap Keuter
parent
b362b47f71
commit
ecb18edf04
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@ -584,6 +584,7 @@ set(DISSECTOR_SRC
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dissectors/packet-gssapi.c
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dissectors/packet-gtp.c
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dissectors/packet-gtpv2.c
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dissectors/packet-gvcp.c
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dissectors/packet-gvrp.c
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dissectors/packet-h1.c
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dissectors/packet-h221_nonstd.c
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@ -488,6 +488,7 @@ DISSECTOR_SRC = \
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packet-gssapi.c \
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packet-gtp.c \
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packet-gtpv2.c \
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packet-gvcp.c \
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packet-gvrp.c \
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packet-h1.c \
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packet-h221_nonstd.c \
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@ -0,0 +1,464 @@
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/* packet-gvcp.c
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* Routines for gvcp (GigEVision Control Protocol) dissection
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* Copyright 2010, Adrian Daerr <adrian.daerr@gmx.de>
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*
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* $Id$
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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,
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* USA.
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*/
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/*
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* Credits to Falco Hirschenberger for his description of GVCP
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* ( http://gitorious.org/opengigevision )
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*
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* GVCP is part of the GigE-Vision interface (a closed standard) to
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* so-called industrial cameras.
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*
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* see also: http://en.wikipedia.org/wiki/GigE_vision
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*
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* This dissector is based on traffic analysis alone, as the
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* description of the GVCP is accessible only to members of the
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* Automated Imaging Association. The resulting packet description is
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* therefore likely to be incomplete or inaccurate.
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*
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* TODO:
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* - fill holes (missing opcodes / field meanings / ...)
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* - conversation level:
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* . validity of anwers (is CMD packet propoerly ACK'ed by follow-up packet?)
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* . reassemble, unzip, store and parse XML file, so that addresses
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* may be translated back into register names
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <epan/packet.h>
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void proto_reg_handoff_gvcp(void);
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#define GVCP_PORT 3956
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static int proto_gvcp = -1;
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static int hf_gvcp_type = -1;
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static int hf_gvcp_opcode = -1;
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static int hf_gvcp_payloadsize = -1;
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static int hf_gvcp_sequenceno = -1;
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static int hf_gvcp_address = -1;
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static int hf_gvcp_value = -1;
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static int hf_gvcp_address2 = -1;
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static int hf_gvcp_value2 = -1;
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static int hf_gvcp_remainder = -1;
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static int hf_gvcp_nwritten = -1;
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static int hf_gvcp_nbytes = -1;
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static int hf_gvcp_unknown16 = -1;
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static int hf_gvcp_data = -1;
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static int hf_gvcp_ip = -1;
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static int hf_gvcp_ether = -1;
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static int hf_gvcp_netmask = -1;
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static gint ett_gvcp = -1;
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static const value_string opcode_names[] = {
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{ 0x02, "Discovery ping" },
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{ 0x03, "Discovery pong" },
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{ 0x04, "Assign IP" },
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{ 0x05, "Ack IP change" },
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{ 0x40, "Resend request" },
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{ 0x80, "Register read request" },
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{ 0x81, "Register read answer" },
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{ 0x82, "Register write request" },
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{ 0x83, "Register write answer" },
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{ 0x84, "MemBlock read request" },
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{ 0x85, "MemBlock read answer" },
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{ 0x86, "MemBlock write request" },
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{ 0x87, "MemBlock write answer" },
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{ 0, NULL }
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};
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static const value_string opcode_short_names[] = {
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{ 0x02, "Disc_Ping" },
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{ 0x03, "Disc_Pong" },
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{ 0x04, "Assign IP" },
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{ 0x05, "Ack IP" },
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{ 0x40, "Res_Req" },
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{ 0x80, "Reg_Rd_Req" },
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{ 0x81, "Reg_Rd_Ans" },
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{ 0x82, "Reg_Wr_Req" },
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{ 0x83, "Reg_Wr_Ans" },
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{ 0x84, "Blk_Rd_Req" },
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{ 0x85, "Blk_Rd_Ans" },
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{ 0x86, "Blk_Wr_Req" },
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{ 0x87, "Blk_Wr_Ans" },
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{ 0, NULL }
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};
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static int
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dissect_gvcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint16 packet_type, packet_opcode, packet_plsize, packet_seqn;
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emem_strbuf_t *info;
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/* Check that there's enough data */
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if (tvb_length(tvb) < 8)
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return 0;
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/* Do some tests on what seems to be PDU field to determine if we
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really have a GVCP packet here, otherwise return 0 to give
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another dissector a chance to dissect it. */
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packet_type = tvb_get_ntohs(tvb, 0);
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/* packets from the PC to the camera on GVCP_PORT seem to always
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start with 0x4201 or 0x4200 */
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if ( pinfo->destport == GVCP_PORT &&
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(packet_type != 0x4200 && packet_type != 0x4201) )
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return 0;
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/* packets from the camera GVCP_PORT to the PC seem to start
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with 0x0000, but can be different on error condition (e.g. 0x8005) */
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/* if ( pinfo->srcport == GVCP_PORT && tvb_get_ntohs(tvb, 0) != 0x0 )
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return 0; */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GVCP");
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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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/* dissect 8 byte header */
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packet_opcode = tvb_get_ntohs(tvb, 2);
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packet_plsize = tvb_get_ntohs(tvb, 4);
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packet_seqn = tvb_get_ntohs(tvb, 6);
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/* allocate growable info string */
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info = ep_strbuf_new(val_to_str(packet_opcode, opcode_names, "Unknown opcode (0x%04x)"));
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/* check that GVCP header+payload match total packet size */
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if (tvb_length(tvb) < 8+(guint32)packet_plsize) {
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ep_strbuf_append_printf(info, " (truncated? %d bytes missing)",
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packet_plsize + 8 - tvb_length(tvb));
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col_add_str(pinfo->cinfo, COL_INFO, info->str);
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return tvb_length(tvb);/* or should we assume this is not GVCP, return 0?*/
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}
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if (tvb_length(tvb) > 8+(guint32)packet_plsize) {
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ep_strbuf_append_printf(info, " (%d excess bytes)",
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-(packet_plsize + 8 - tvb_length(tvb)));
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col_add_str(pinfo->cinfo, COL_INFO, info->str);
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return tvb_length(tvb);/* or should we assume this is not GVCP, return 0?*/
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}
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if (packet_plsize & 3) {/* payload is always a multiple of 4 bytes */
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ep_strbuf_append(info, " (payload is not multiple of 4 bytes)");
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col_add_str(pinfo->cinfo, COL_INFO, info->str);
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return tvb_length(tvb);/* or should we assume this is not GVCP, return 0?*/
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}
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/* switch just concerned with building a meaningfull Info column string */
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switch (packet_opcode) {
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case 0x04: /* Assign new temporary IP */
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if (packet_plsize < 24) {/* 56 bytes seem to be normal */
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ep_strbuf_append(info, " <missing args>");
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} else { /* packet contain new network configuration */
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ep_strbuf_append_printf(info, "%d.%d.%d.%d to %s",
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tvb_get_guint8(tvb, 28), tvb_get_guint8(tvb, 29),
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tvb_get_guint8(tvb, 30), tvb_get_guint8(tvb, 31),
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tvb_bytes_to_str_punct(tvb, 10, 6, ':'));
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}
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break;
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case 0x80: /* Register Read Request */
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case 0x81: /* Register Read Answer */
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if (packet_plsize == 0) {
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ep_strbuf_append(info, " <missing arg(s)>");
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} else { /* packet contains adress(es) to read from */
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ep_strbuf_append_printf(info, " 0x%08x", tvb_get_ntohl(tvb, 8));
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if (packet_plsize >= 8) {
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ep_strbuf_append_printf(info, ", 0x%08x", tvb_get_ntohl(tvb, 12));
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if (packet_plsize >= 12)
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ep_strbuf_append(info, ", ...");
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}
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}
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break;
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case 0x82: /* Register Write Request */
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if (packet_plsize < 8) {
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ep_strbuf_append(info, " <missing arg(s)>");
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} else { /* packet contains adress/value pairs to read from */
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ep_strbuf_append_printf(info, " *0x%08x = 0x%08x", tvb_get_ntohl(tvb, 8),
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tvb_get_ntohl(tvb, 12));
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if (packet_plsize >= 16) {
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ep_strbuf_append_printf(info, ", *0x%08x = 0x%08x",
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tvb_get_ntohl(tvb, 16), tvb_get_ntohl(tvb, 20));
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if (packet_plsize >= 24)
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ep_strbuf_append(info, ", ...");
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}
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}
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break;
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case 0x83: /* Register Write Answer */
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if (packet_plsize < 4) {
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ep_strbuf_append(info, " <missing arg>");
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} else {
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ep_strbuf_append_printf(info, " %d register%s written",
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tvb_get_ntohl(tvb, 8),
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tvb_get_ntohl(tvb, 8)==1?"":"s");
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}
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break;
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case 0x84: /* Block Read Request */
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if (packet_plsize < 8) {
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ep_strbuf_append(info, " <missing args>");
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} else { /* packet contains adress/size pair to read from */
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ep_strbuf_append_printf(info, " 0x%08x (%d bytes, X=0x%04x)",
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tvb_get_ntohl(tvb, 8), tvb_get_ntohs(tvb, 14),
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tvb_get_ntohs(tvb, 12));
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if (packet_plsize > 8) {
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ep_strbuf_append(info, "; excess payload");
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}
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}
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break;
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case 0x85: /* Block Read Answer */
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if (packet_plsize < 8) {
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ep_strbuf_append(info, " <missing args>");
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} else { /* packet contains desired data */
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ep_strbuf_append_printf(info, " %d bytes from 0x%08x", packet_plsize - 4,
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tvb_get_ntohl(tvb, 8));
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}
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break;
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case 0x86: /* Block Write Request */
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if (packet_plsize < 8) {
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ep_strbuf_append(info, " <missing args>");
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} else { /* packet contains desired data */
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ep_strbuf_append_printf(info, " *0x%08x = <%d bytes>",
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tvb_get_ntohl(tvb, 8), packet_plsize - 4);
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}
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break;
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case 0x87: /* Block Write Answer */
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if (packet_plsize < 4) {
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ep_strbuf_append(info, " <missing arg>");
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} else {
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ep_strbuf_append_printf(info, " %d bytes written", tvb_get_ntohl(tvb, 8));
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}
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break;
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}
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col_add_str(pinfo->cinfo, COL_INFO, info->str);
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if (tree) { /* we are being asked for details */
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proto_item *ti = NULL;
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proto_tree *gvcp_tree = NULL;
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ti = proto_tree_add_item(tree, proto_gvcp, tvb, 0, -1, FALSE);
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gvcp_tree = proto_item_add_subtree(ti, ett_gvcp);
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proto_tree_add_item(gvcp_tree, hf_gvcp_type, tvb, 0, 2, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_opcode, tvb, 2, 2, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_payloadsize, tvb, 4, 2, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_sequenceno, tvb, 6, 2, FALSE);
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/* opcode specific fields */
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switch (packet_opcode) {
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case 0x04: /* Assign new temporary network configuration */
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if (packet_plsize >= 48) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_ether, tvb, 10, 6, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_ip, tvb, 28, 4, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_netmask, tvb, 44, 4, FALSE);
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}
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break;
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case 0x80: /* Register Read Request */
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if (packet_plsize >= 4) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_address, tvb, 8, 4, FALSE);
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if (packet_plsize >= 8) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_address2, tvb, 12, 4, FALSE);
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if (packet_plsize >= 12)
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proto_tree_add_item(gvcp_tree, hf_gvcp_remainder, tvb, 16, -1, FALSE);
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}
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}
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break;
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case 0x81: /* Register Read Answer */
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if (packet_plsize >= 4) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_value, tvb, 8, 4, FALSE);
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if (packet_plsize >= 8) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_value2, tvb, 12, 4, FALSE);
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if (packet_plsize >= 12)
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proto_tree_add_item(gvcp_tree, hf_gvcp_remainder, tvb, 16, -1, FALSE);
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}
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}
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break;
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case 0x82: /* Register Write Request */
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if (packet_plsize >= 8) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_address, tvb, 8, 4, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_value, tvb, 12, 4, FALSE);
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if (packet_plsize >= 16) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_address2, tvb, 16, 4, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_value2, tvb, 20, 4, FALSE);
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if (packet_plsize >= 24)
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proto_tree_add_item(gvcp_tree, hf_gvcp_remainder, tvb, 24, -1, FALSE);
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}
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}
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break;
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case 0x83: /* Register Write Answer */
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if (packet_plsize >= 4)
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proto_tree_add_item(gvcp_tree, hf_gvcp_nwritten, tvb, 8, 4, FALSE);
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break;
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case 0x84: /* Block Read Request */
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if (packet_plsize >= 8) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_address, tvb, 8, 4, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_unknown16, tvb, 12, 2, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_nbytes, tvb, 14, 2, FALSE);
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}
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break;
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case 0x85: /* Block Read Answer */
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case 0x86: /* Block Write Request */
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if (packet_plsize >= 8) {
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proto_tree_add_item(gvcp_tree, hf_gvcp_address, tvb, 8, 4, FALSE);
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proto_tree_add_item(gvcp_tree, hf_gvcp_data, tvb, 12, -1, FALSE);
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}
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break;
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case 0x87: /* Block Write Answer */
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if (packet_plsize >= 4)
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proto_tree_add_item(gvcp_tree, hf_gvcp_nbytes, tvb, 10, 2, FALSE);
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break;
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default:
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if (packet_plsize > 0)
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proto_tree_add_item(gvcp_tree, hf_gvcp_data, tvb, 8, -1, FALSE);
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break;
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}
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}
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return tvb_length(tvb);
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}
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void
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proto_reg_handoff_gvcp(void)
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{
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static dissector_handle_t gvcp_handle;
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gvcp_handle = new_create_dissector_handle(dissect_gvcp, proto_gvcp);
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dissector_add("udp.port", GVCP_PORT, gvcp_handle);
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}
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void
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proto_register_gvcp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_gvcp_type,
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{ "GVCP Type", "gvcp.type",
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FT_UINT16, BASE_HEX,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_gvcp_opcode,
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{ "GVCP Opcode", "gvcp.opcode",
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FT_UINT16, BASE_HEX,
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VALS(opcode_names), 0x0,
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NULL, HFILL }
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},
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{ &hf_gvcp_payloadsize,
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{ "GVCP Payload bytes", "gvcp.size",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_gvcp_sequenceno,
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{ "GVCP Sequence number", "gvcp.seqn",
|
||||
FT_UINT16, BASE_DEC,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_address,
|
||||
{ "Address", "gvcp.address",
|
||||
FT_UINT32, BASE_HEX,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_value,
|
||||
{ "Value", "gvcp.value",
|
||||
FT_UINT32, BASE_HEX,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_address2,
|
||||
{ "Address 2", "gvcp.address2",
|
||||
FT_UINT32, BASE_HEX,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_value2,
|
||||
{ "Value 2", "gvcp.value2",
|
||||
FT_UINT32, BASE_HEX,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_remainder,
|
||||
{ "Remaining arguments", "gvcp.remainder",
|
||||
FT_BYTES, BASE_NONE,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_nwritten,
|
||||
{ "Number of registers written", "gvcp.nwritten",
|
||||
FT_UINT32, BASE_DEC,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_nbytes,
|
||||
{ "Number of bytes", "gvcp.nbytes",
|
||||
FT_UINT32, BASE_DEC,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_unknown16,
|
||||
{ "2-byte unknown meaning", "gvcp.unkown16",
|
||||
FT_UINT16, BASE_HEX,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_data,
|
||||
{ "Data", "gvcp.data",
|
||||
FT_BYTES, BASE_NONE,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_ether,
|
||||
{ "Link layer address (ethernet)", "gvcp.ether",
|
||||
FT_ETHER, BASE_NONE,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_ip,
|
||||
{ "IPv4 address", "gvcp.ip",
|
||||
FT_IPv4, BASE_NONE,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_gvcp_netmask,
|
||||
{ "Netmask", "gvcp.netmask",
|
||||
FT_IPv4, BASE_NONE,
|
||||
NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
}
|
||||
};
|
||||
|
||||
/* Setup protocol subtree array */
|
||||
static gint *ett[] = {
|
||||
&ett_gvcp
|
||||
};
|
||||
|
||||
proto_gvcp = proto_register_protocol ("GigE Vision Control Protocol", /*name*/
|
||||
"GVCP", /* short name */
|
||||
"gvcp" /* abbrev */);
|
||||
|
||||
proto_register_field_array(proto_gvcp, hf, array_length(hf));
|
||||
proto_register_subtree_array(ett, array_length(ett));
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue