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wireshark/epan/dissectors/packet-catapult-dct2000.c

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/* packet-catapult-dct2000.c
* Routines for Catapult DCT2000 packet stub header disassembly
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <epan/packet.h>
#include <epan/emem.h>
#include <epan/proto.h>
#include <epan/prefs.h>
#include "../wiretap/catapult_dct2000.h"
/* Protocol and registered fields. */
static int proto_catapult_dct2000 = -1;
static int hf_catapult_dct2000_context = -1;
static int hf_catapult_dct2000_port_number = -1;
static int hf_catapult_dct2000_timestamp = -1;
static int hf_catapult_dct2000_protocol = -1;
static int hf_catapult_dct2000_direction = -1;
static int hf_catapult_dct2000_encap = -1;
static int hf_catapult_dct2000_unparsed_data = -1;
gboolean catapult_dct2000_board_ports_only;
/* Protocol subtree. */
static int ett_catapult_dct2000 = -1;
static const value_string direction_vals[] = {
{ 0, "Sent" },
{ 1, "Received" },
{ 0, NULL },
};
static const value_string encap_vals[] = {
{ WTAP_ENCAP_RAW_IP, "Raw IP" },
{ WTAP_ENCAP_ETHERNET, "Ethernet" },
{ WTAP_ENCAP_ISDN, "LAPD" },
{ WTAP_ENCAP_ATM_PDUS_UNTRUNCATED, "ATM (PDUs untruncated)" },
{ WTAP_ENCAP_PPP, "PPP" },
{ DCT2000_ENCAP_SSCOP, "SSCOP" },
{ WTAP_ENCAP_FRELAY, "Frame Relay" },
{ WTAP_ENCAP_MTP2, "MTP2" },
{ DCT2000_ENCAP_UNHANDLED, "Unhandled Protocol" },
{ 0, NULL },
};
/*****************************************/
/* Main dissection function. */
/*****************************************/
static void
dissect_catapult_dct2000(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *dct2000_tree;
proto_item *ti;
gint offset = 0;
gint context_length;
guint8 port_number;
gint protocol_start;
gint protocol_length;
gint timestamp_start;
gint timestamp_length;
guint8 direction;
tvbuff_t *next_tvb;
int encap;
dissector_handle_t protocol_handle = 0;
int sub_dissector_result = 0;
/* Protocol name */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
{
col_add_str(pinfo->cinfo, COL_PROTOCOL, "DCT2000");
}
/* Info column */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_clear(pinfo->cinfo, COL_INFO);
}
/* Create protocol tree. */
ti = proto_tree_add_item(tree, proto_catapult_dct2000, tvb, offset, -1, FALSE);
dct2000_tree = proto_item_add_subtree(ti, ett_catapult_dct2000);
/* Context Name */
context_length = tvb_strsize(tvb, offset);
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_context, tvb,
offset, context_length, FALSE);
offset += context_length;
/* Context port number */
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_port_number, tvb,
offset, 1, FALSE);
port_number = tvb_get_guint8(tvb, offset);
offset++;
/* Timestamp in file */
timestamp_start = offset;
timestamp_length = tvb_strsize(tvb, offset);
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_timestamp, tvb,
offset, timestamp_length, FALSE);
offset += timestamp_length;
/* Original protocol name */
protocol_start = offset;
protocol_length = tvb_strsize(tvb, offset);
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_protocol, tvb,
offset, protocol_length, FALSE);
offset += protocol_length;
/* Direction */
direction = tvb_get_guint8(tvb, offset);
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_direction, tvb,
offset, 1, FALSE);
offset++;
/* Read file encap */
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_encap, tvb, offset, 1, FALSE);
encap = tvb_get_guint8(tvb, offset);
offset++;
/* Set selection length of dct2000 tree */
proto_item_set_len(dct2000_tree, offset);
/* Add useful details to protocol tree label */
proto_item_append_text(ti, " context=%s.%u t=%s %c prot=%s",
tvb_get_ephemeral_string(tvb, 0, context_length),
port_number,
tvb_get_ephemeral_string(tvb, timestamp_start, timestamp_length),
(direction == 0) ? 'S' : 'R',
tvb_get_ephemeral_string(tvb, protocol_start, protocol_length));
/* Note that the first item of pinfo->pseudo_header->dct2000 will contain
the pseudo-header needed (in some cases) by the wireshark dissector */
/***********************************************************************/
/* Now hand off to the dissector of intended packet encapsulation type */
/* Get protocol handle, and set p2p_dir where necessary.
(packet-frame.c won't copy it from pseudo-header because it doesn't
know about Catapult DCT2000 encap type...)
*/
switch (encap)
{
case WTAP_ENCAP_RAW_IP:
protocol_handle = find_dissector("ip");
break;
case WTAP_ENCAP_ETHERNET:
protocol_handle = find_dissector("eth_withoutfcs");
break;
case WTAP_ENCAP_ISDN:
protocol_handle = find_dissector("lapd");
pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton;
break;
case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
protocol_handle = find_dissector("atm_untruncated");
break;
case WTAP_ENCAP_PPP:
protocol_handle = find_dissector("ppp_hdlc");
pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent;
break;
case DCT2000_ENCAP_SSCOP:
protocol_handle = find_dissector("sscop");
break;
case WTAP_ENCAP_FRELAY:
protocol_handle = find_dissector("fr");
break;
case DCT2000_ENCAP_MTP2:
protocol_handle = find_dissector("mtp2");
break;
case DCT2000_ENCAP_UNHANDLED:
protocol_handle = 0;
break;
default:
/* !! If get here, there is a mismatch between
this dissector and the wiretap module catapult_dct2000.c !!
*/
DISSECTOR_ASSERT_NOT_REACHED();
return;
}
/* Try appropriate dissector, if selected */
if (protocol_handle != 0)
{
/* Dissect the remainder of the frame using chosen protocol handle */
next_tvb = tvb_new_subset(tvb, offset, -1, tvb_reported_length(tvb)-offset);
sub_dissector_result = call_dissector_only(protocol_handle, next_tvb, pinfo, tree);
}
if (protocol_handle == 0 || sub_dissector_result == 0)
{
/* Could get here because:
- encap is DCT2000_ENCAP_UNHANDLED, OR
- desired protocol is unavailable (probably disabled), OR
- protocol rejected our data
Show remaining bytes as unparsed data */
proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_unparsed_data,
tvb, offset, -1, FALSE);
if (check_col(pinfo->cinfo, COL_INFO))
{
col_add_fstr(pinfo->cinfo, COL_INFO,
"Unparsed protocol data (context=%s.%u t=%s %c prot=%s)",
tvb_get_ephemeral_string(tvb, 0, context_length),
port_number,
tvb_get_ephemeral_string(tvb, timestamp_start, timestamp_length),
(direction == 0) ? 'S' : 'R',
tvb_get_ephemeral_string(tvb, protocol_start, protocol_length));
}
}
}
/******************************************************************************/
/* Associate this protocol with the Catapult DCT2000 file encapsulation type. */
/******************************************************************************/
void proto_reg_handoff_catapult_dct2000(void)
{
dissector_handle_t catapult_dct2000_handle = find_dissector("dct2000");
dissector_add("wtap_encap", WTAP_ENCAP_CATAPULT_DCT2000,
catapult_dct2000_handle);
}
/****************************************/
/* Register the protocol */
/****************************************/
void proto_register_catapult_dct2000(void)
{
static hf_register_info hf[] =
{
{ &hf_catapult_dct2000_context,
{ "Context",
"dct2000.context", FT_STRING, BASE_NONE, NULL, 0x0,
"Context name", HFILL
}
},
{ &hf_catapult_dct2000_port_number,
{ "Context Port number",
"dct2000.context_port", FT_UINT8, BASE_DEC, NULL, 0x0,
"Context port number", HFILL
}
},
{ &hf_catapult_dct2000_timestamp,
{ "Timestamp",
"dct2000.timestamp", FT_STRING, BASE_NONE, NULL, 0x0,
"File timestamp", HFILL
}
},
{ &hf_catapult_dct2000_protocol,
{ "DCT2000 protocol",
"dct2000.protocol", FT_STRING, BASE_NONE, NULL, 0x0,
"Original (DCT2000) protocol name", HFILL
}
},
{ &hf_catapult_dct2000_direction,
{ "Direction",
"dct2000.direction", FT_UINT8, BASE_DEC, VALS(direction_vals), 0x0,
"Frame direction (Sent or Received)", HFILL
}
},
{ &hf_catapult_dct2000_encap,
{ "Wireshark encapsulation",
"dct2000.encapsulation", FT_UINT8, BASE_DEC, VALS(encap_vals), 0x0,
"Wireshark encapsulation used", HFILL
}
},
{ &hf_catapult_dct2000_unparsed_data,
{ "Unparsed protocol data",
"dct2000.unparsed_data", FT_BYTES, BASE_NONE, NULL, 0x0,
"Unparsed DCT2000 protocol data", HFILL
}
},
};
static gint *ett[] =
{
&ett_catapult_dct2000
};
module_t *catapult_dct2000_module;
/* Register protocol. */
proto_catapult_dct2000 = proto_register_protocol("DCT2000", "DCT2000", "dct2000");
proto_register_field_array(proto_catapult_dct2000, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Allow dissector to find be found by name. */
register_dissector("dct2000", dissect_catapult_dct2000, proto_catapult_dct2000);
/* Preferences */
catapult_dct2000_module = prefs_register_protocol(proto_catapult_dct2000,
proto_reg_handoff_catapult_dct2000);
/* Determines whether non-supported protocols should be shown anyway */
prefs_register_bool_preference(catapult_dct2000_module, "board_ports_only",
"Only show known 'board-port' protocols",
"Don't show other protocols, i.e. unknown board-port "
"protocols and non-standard primitives between "
"contexts on the same card. The capture file "
"needs to be (re)-loaded before effect will be seen",
&catapult_dct2000_board_ports_only);
}
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