epan/dissectors/packet-vicp.c

   1 /* packet-vicp.c
   2  * LeCroy VICP (GPIB-over-Ethernet-but-lets-not-do-LXI) dissector
   3  *
   4  * Written by Frank Kingswood <frank.kingswood@artimi.com>
   5  * Copyright 2008, Artimi Ltd.
   6  *
   7  * $Id$
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  26  */
  27
  28 #include "config.h"
  29
  30 #include <epan/packet.h>
  31 #include <epan/ptvcursor.h>
  32
  33 /* registration object IDs */
  34 static int proto_vicp = -1;
  35 static int hf_vicp_operation = -1;
  36 static int hf_vicp_version = -1;
  37 static int hf_vicp_sequence = -1;
  38 static int hf_vicp_unused = -1;
  39 static int hf_vicp_length = -1;
  40 static int hf_vicp_data = -1;
  41 static gint ett_vicp = -1;
  42
  43 #define VICP_PORT 1861
  44
  45 static void dissect_vicp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  46 {
  47    proto_item *ti;
  48    proto_tree *vicp_tree;
  49    ptvcursor_t* cursor;
  50
  51    guint len;
  52
  53    if (tvb_reported_length_remaining(tvb, 0) < 8)
  54    {
  55       /* Payload too small for VICP */
  56       return;
  57    }
  58
  59    col_set_str(pinfo->cinfo, COL_PROTOCOL, "VICP");
  60
  61    col_clear(pinfo->cinfo, COL_INFO);
  62
  63    ti = proto_tree_add_item(tree, proto_vicp, tvb, 0, -1, ENC_NA);
  64    vicp_tree = proto_item_add_subtree(ti, ett_vicp);
  65    cursor = ptvcursor_new(vicp_tree, tvb, 0);
  66
  67    ptvcursor_add(cursor, hf_vicp_operation, 1, ENC_BIG_ENDIAN);
  68    ptvcursor_add(cursor, hf_vicp_version,   1, ENC_BIG_ENDIAN);
  69    ptvcursor_add(cursor, hf_vicp_sequence,  1, ENC_BIG_ENDIAN);
  70    ptvcursor_add(cursor, hf_vicp_unused,    1, ENC_BIG_ENDIAN);
  71
  72    len=tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
  73    ptvcursor_add(cursor, hf_vicp_length, 4, ENC_BIG_ENDIAN);
  74
  75    if(len==0)
  76       proto_tree_add_text(vicp_tree, tvb, 0, 0, "No data");
  77    else
  78       ptvcursor_add(cursor, hf_vicp_data, len, ENC_NA);
  79
  80    ptvcursor_free(cursor);
  81 }
  82
  83 void proto_register_vicp(void)
  84 {
  85    static hf_register_info hf[] =
  86    {
  87       {  &hf_vicp_operation,
  88          { "Operation","vicp.operation",FT_UINT8,BASE_HEX,NULL,0x0,NULL,HFILL }
  89       },
  90       {  &hf_vicp_version,
  91          { "Protocol version","vicp.version",FT_UINT8,BASE_DEC,NULL,0x0,NULL,HFILL }
  92       },
  93       {  &hf_vicp_sequence,
  94          { "Sequence number","vicp.sequence",FT_UINT8,BASE_DEC,NULL,0x0,NULL,HFILL }
  95       },
  96       {  &hf_vicp_unused,
  97          { "Unused","vicp.unused",FT_UINT8,BASE_HEX,NULL,0x0,NULL,HFILL }
  98       },
  99       {  &hf_vicp_length,
 100          { "Data length","vicp.length",FT_UINT32,BASE_DEC,NULL,0x0,NULL,HFILL }
 101       },
 102       {  &hf_vicp_data,
 103          { "Data","vicp.data",FT_BYTES,BASE_NONE,NULL,0x0,NULL,HFILL }
 104       }
 105    };
 106
 107    static gint *ett[] =
 108    {  &ett_vicp
 109    };
 110
 111    proto_vicp = proto_register_protocol("LeCroy VICP", "VICP", "vicp");
 112    proto_register_field_array(proto_vicp, hf, array_length(hf));
 113    proto_register_subtree_array(ett, array_length(ett));
 114 }
 115
 116 void proto_reg_handoff_vicp(void)
 117 {  dissector_handle_t vicp_handle;
 118
 119    vicp_handle = create_dissector_handle(dissect_vicp, proto_vicp);
 120    dissector_add_uint("tcp.port", VICP_PORT, vicp_handle);
 121 }