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wireshark/epan/dissectors/packet-fcp.c

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/* packet-fcp.c
* Routines for Fibre Channel Protocol for SCSI (FCP)
* Copyright 2001, Dinesh G Dutt <ddutt@cisco.com>
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#include <epan/prefs.h>
#include <epan/emem.h>
#include <epan/packet.h>
#include <epan/conversation.h>
#include "etypes.h"
#include "packet-fc.h"
#include "packet-fcp.h"
#include "packet-scsi.h"
/* Initialize the protocol and registered fields */
static int proto_fcp = -1;
static int hf_fcp_multilun = -1;
static int hf_fcp_singlelun = -1;
static int hf_fcp_crn = -1;
static int hf_fcp_taskattr = -1;
static int hf_fcp_taskmgmt = -1;
static int hf_fcp_addlcdblen = -1;
static int hf_fcp_rddata = -1;
static int hf_fcp_wrdata = -1;
static int hf_fcp_dl = -1;
static int hf_fcp_data_ro = -1;
static int hf_fcp_burstlen = -1;
static int hf_fcp_rspflags = -1;
static int hf_fcp_resid = -1;
static int hf_fcp_snslen = -1;
static int hf_fcp_rsplen = -1;
static int hf_fcp_rspcode = -1;
static int hf_fcp_scsistatus = -1;
static int hf_fcp_type = -1;
/* Initialize the subtree pointers */
static gint ett_fcp = -1;
static dissector_table_t fcp_dissector;
static dissector_handle_t data_handle;
typedef struct _fcp_conv_key {
guint32 conv_idx;
} fcp_conv_key_t;
typedef struct _fcp_conv_data {
guint32 fcp_dl;
gint32 fcp_lun;
nstime_t abs_ts;
} fcp_conv_data_t;
GHashTable *fcp_req_hash = NULL;
/*
* Hash Functions
*/
static gint
fcp_equal(gconstpointer v, gconstpointer w)
{
const fcp_conv_key_t *v1 = v;
const fcp_conv_key_t *v2 = w;
return (v1->conv_idx == v2->conv_idx);
}
static guint
fcp_hash (gconstpointer v)
{
const fcp_conv_key_t *key = v;
guint val;
val = key->conv_idx;
return val;
}
/*
* Protocol initialization
*/
static void
fcp_init_protocol(void)
{
if (fcp_req_hash)
g_hash_table_destroy(fcp_req_hash);
fcp_req_hash = g_hash_table_new(fcp_hash, fcp_equal);
}
static gchar *
task_mgmt_flags_to_str (guint8 flags, gchar *str)
{
int stroff = 0;
if (str == NULL)
return str;
*str = '\0';
if (flags & 0x80) {
strcpy (str, "Obsolete, ");
stroff += 10;
}
if (flags & 0x40) {
strcpy (&str[stroff], "Clear ACA, ");
stroff += 11;
}
if (flags & 0x20) {
strcpy (&str[stroff], "Target Reset, ");
stroff += 14;
}
if (flags & 0x10) {
strcpy (&str[stroff], "LU Reset, ");
stroff += 10;
}
if (flags & 0x08) {
strcpy (&str[stroff], "Rsvd, ");
stroff += 6;
}
if (flags & 0x04) {
strcpy (&str[stroff], "Clear Task Set, ");
stroff += 16;
}
if (flags & 0x02) {
strcpy (&str[stroff], "Abort Task Set");
stroff += 14;
}
return (str);
}
static gchar *
rspflags_to_str (guint8 flags, gchar *str)
{
int stroff = 0;
if (str == NULL)
return (str);
*str = '\0';
if (flags & 0x10) {
strcpy (str, "FCP_CONF_REQ | ");
stroff += 15;
}
if (flags & 0x08) {
strcpy (&str[stroff], "FCP_RESID_UNDER | ");
stroff += 18;
}
if (flags & 0x04) {
strcpy (&str[stroff], "FCP_RESID_OVER | ");
stroff += 17;
}
if (flags & 0x02) {
strcpy (&str[stroff], "FCP_SNS_LEN_VLD | ");
stroff += 18;
}
if (flags & 0x01) {
strcpy (&str[stroff], "FCP_RSP_LEN_VLD | ");
}
return (str);
}
/* Code to actually dissect the packets */
static void
dissect_fcp_cmnd (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
int len,
add_len = 0;
gchar str[128];
guint8 flags, lun0;
proto_item *ti;
proto_tree *fcp_tree = NULL;
conversation_t *conversation;
fcp_conv_data_t *cdata;
fcp_conv_key_t ckey, *req_key;
scsi_task_id_t task_key;
guint16 lun=0xffff;
tvbuff_t *cdb_tvb;
int tvb_len, tvb_rlen;
/* Determine the length of the FCP part of the packet */
flags = tvb_get_guint8 (tvb, offset+10);
if (flags) {
add_len = tvb_get_guint8 (tvb, offset+11) & 0x7C;
add_len = add_len >> 2;
len = FCP_DEF_CMND_LEN + add_len;
}
else {
len = FCP_DEF_CMND_LEN;
}
/* We track the conversation to determine how many bytes is required */
/* by the data that is sent back or sent next by the initiator as part */
/* of this command. The state is destroyed in the response dissector */
conversation = find_conversation (pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->oxid,
pinfo->rxid, NO_PORT2);
if (!conversation) {
/* NO_PORT2: Dont check RXID, iFCP traces i have all have
* RXID==0xffff in the command PDU. ronnie */
conversation = conversation_new (pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->oxid,
pinfo->rxid, NO_PORT2);
}
ckey.conv_idx = conversation->index;
task_key.conv_id = conversation->index;
task_key.task_id = conversation->index;
pinfo->private_data = (void *)&task_key;
cdata = (fcp_conv_data_t *)g_hash_table_lookup (fcp_req_hash,
&ckey);
/*
* XXX - the fetch of the fcp_dl value will throw an exception on
* a short frame before we get a chance to dissect the stuff before
* it.
*
* XXX - this doesn't appear to store the data length with the
* FCP packet with the data, so this might not work correctly
* if you select a command packet, select the corresponding data
* packet, and then select another data packet with a different
* length.
*/
if (cdata) {
/* Since we never free the memory used by an exchange, this maybe a
* case of another request using the same exchange as a previous
* req.
*/
cdata->fcp_dl = tvb_get_ntohl (tvb, offset+12+16+add_len);
cdata->abs_ts = pinfo->fd->abs_ts;
}
else {
req_key = se_alloc (sizeof(fcp_conv_key_t));
req_key->conv_idx = conversation->index;
cdata = se_alloc (sizeof(fcp_conv_data_t));
cdata->fcp_dl = tvb_get_ntohl (tvb, offset+12+16+add_len);
cdata->abs_ts = pinfo->fd->abs_ts;
g_hash_table_insert (fcp_req_hash, req_key, cdata);
}
/* XXX this one is redundant right? ronnie
dissect_scsi_cdb (tvb, pinfo, fcp_tree, offset+12, 16+add_len,
SCSI_DEV_UNKNOWN, lun);
*/
if (tree) {
ti = proto_tree_add_protocol_format (tree, proto_fcp, tvb, 0, len,
"FCP_CMND");
fcp_tree = proto_item_add_subtree (ti, ett_fcp);
}
proto_tree_add_uint_hidden (fcp_tree, hf_fcp_type, tvb, offset, 0, 0);
lun0 = tvb_get_guint8 (tvb, offset);
/* Display single-level LUNs in decimal for clarity */
/* I'm taking a shortcut here by assuming that if the first byte of the
* LUN field is 0, it is a single-level LUN. This is not true. For a
* real single-level LUN, all 8 bytes except byte 1 must be 0.
*/
if (lun0) {
cdata->fcp_lun = -1;
proto_tree_add_item (fcp_tree, hf_fcp_multilun, tvb, offset, 8, 0);
lun=tvb_get_guint8(tvb, offset)&0x3f;
lun<<=8;
lun|=tvb_get_guint8(tvb, offset+1);
}
else {
cdata->fcp_lun = tvb_get_guint8 (tvb, offset+1);
proto_tree_add_item (fcp_tree, hf_fcp_singlelun, tvb, offset+1,
1, 0);
lun=tvb_get_guint8(tvb, offset+1);
}
proto_tree_add_item (fcp_tree, hf_fcp_crn, tvb, offset+8, 1, 0);
proto_tree_add_item (fcp_tree, hf_fcp_taskattr, tvb, offset+9, 1, 0);
proto_tree_add_uint_format (fcp_tree, hf_fcp_taskmgmt, tvb, offset+10,
1, flags,
"Task Management Flags: 0x%x (%s)",
flags,
task_mgmt_flags_to_str (flags, str));
proto_tree_add_item (fcp_tree, hf_fcp_addlcdblen, tvb, offset+11, 1, 0);
proto_tree_add_item (fcp_tree, hf_fcp_rddata, tvb, offset+11, 1, 0);
proto_tree_add_item (fcp_tree, hf_fcp_wrdata, tvb, offset+11, 1, 0);
tvb_len=tvb_length_remaining(tvb, offset+12);
if(tvb_len>(16+add_len))
tvb_len=16+add_len;
tvb_rlen=tvb_reported_length_remaining(tvb, offset+12);
if(tvb_rlen>(16+add_len))
tvb_rlen=16+add_len;
cdb_tvb=tvb_new_subset(tvb, offset+12, tvb_len, tvb_rlen);
dissect_scsi_cdb (cdb_tvb, pinfo, tree, SCSI_DEV_UNKNOWN, lun);
proto_tree_add_item (fcp_tree, hf_fcp_dl, tvb, offset+12+16+add_len,
4, 0);
}
static void
dissect_fcp_data (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
conversation_t *conversation;
fcp_conv_data_t *cdata = NULL;
fcp_conv_key_t ckey;
proto_item *ti;
proto_tree *fcp_tree;
scsi_task_id_t task_key;
/* Retrieve conversation state to determine expected payload */
conversation = find_conversation (pinfo->fd->num, &pinfo->dst, &pinfo->src,
pinfo->ptype, pinfo->oxid,
pinfo->rxid, NO_PORT2);
if (conversation) {
ckey.conv_idx = conversation->index;
cdata = (fcp_conv_data_t *)g_hash_table_lookup (fcp_req_hash,
&ckey);
task_key.conv_id = conversation->index;
task_key.task_id = conversation->index;
pinfo->private_data = (void *)&task_key;
}
else {
pinfo->private_data = NULL;
}
if (cdata) {
ti = proto_tree_add_protocol_format (tree, proto_fcp, tvb, 0, 0,
"FCP_DATA");
fcp_tree = proto_item_add_subtree (ti, ett_fcp);
if (cdata->fcp_lun >= 0)
proto_tree_add_uint_hidden (fcp_tree, hf_fcp_singlelun, tvb,
0, 0, cdata->fcp_lun);
dissect_scsi_payload (tvb, pinfo, tree, FALSE, (guint16) cdata->fcp_lun);
}
else {
dissect_scsi_payload (tvb, pinfo, tree, FALSE, 0xffff);
}
}
static void
dissect_fcp_rsp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint32 offset = 0,
del_usecs = 0;
guint32 snslen = 0,
rsplen = 0;
gchar str[128];
guint8 flags;
proto_item *ti;
proto_tree *fcp_tree;
guint8 status;
conversation_t *conversation;
fcp_conv_data_t *cdata = NULL;
fcp_conv_key_t ckey;
scsi_task_id_t task_key;
status = tvb_get_guint8 (tvb, offset+11);
if (check_col (pinfo->cinfo, COL_INFO)) {
col_append_fstr (pinfo->cinfo, COL_INFO, " , %s",
val_to_str (status, scsi_status_val, "0x%x"));
}
/* Response marks the end of the conversation. So destroy state */
conversation = find_conversation (pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->oxid,
pinfo->rxid, NO_PORT2);
if (conversation) {
ckey.conv_idx = conversation->index;
cdata = (fcp_conv_data_t *)g_hash_table_lookup (fcp_req_hash,
&ckey);
task_key.conv_id = task_key.task_id = conversation->index;
pinfo->private_data = (void *)&task_key;
}
if (tree) {
ti = proto_tree_add_protocol_format (tree, proto_fcp, tvb, 0, -1,
"FCP_RSP");
fcp_tree = proto_item_add_subtree (ti, ett_fcp);
proto_tree_add_uint_hidden (fcp_tree, hf_fcp_type, tvb, offset, 0, 0);
if (cdata) {
/* XXX - this is ugly and should be replaced by a "standard way" */
del_usecs = (pinfo->fd->abs_ts.secs - cdata->abs_ts.secs)* 1000000 +
(pinfo->fd->abs_ts.nsecs - cdata->abs_ts.nsecs) / 1000;
if (del_usecs > 1000)
proto_tree_add_text (fcp_tree, tvb, offset, 0,
"Cmd Response Time: %d msecs",
del_usecs/1000);
else
proto_tree_add_text (fcp_tree, tvb, offset, 0,
"Cmd Response Time: %d usecs",
del_usecs);
if (cdata->fcp_lun >= 0)
proto_tree_add_uint_hidden (fcp_tree, hf_fcp_singlelun, tvb,
offset, 0, cdata->fcp_lun);
}
flags = tvb_get_guint8 (tvb, offset+10);
proto_tree_add_uint_format (fcp_tree, hf_fcp_rspflags, tvb, offset+10,
1, flags, "Flags: 0x%02x (%s)", flags,
rspflags_to_str (flags, str));
proto_tree_add_item (fcp_tree, hf_fcp_scsistatus, tvb, offset+11, 1, 0);
if (flags & 0xC)
proto_tree_add_item (fcp_tree, hf_fcp_resid, tvb, offset+12, 4, 0);
if (flags & 0x2) {
snslen = tvb_get_ntohl (tvb, offset+16);
proto_tree_add_uint (fcp_tree, hf_fcp_snslen, tvb, offset+16, 4,
snslen);
}
if (flags & 0x1) {
rsplen = tvb_get_ntohl (tvb, offset+20);
proto_tree_add_uint (fcp_tree, hf_fcp_rsplen, tvb, offset+20, 4,
rsplen);
/* XXX - must rsplen be >= 4? What other than the code is there? */
proto_tree_add_item (fcp_tree, hf_fcp_rspcode, tvb, offset+27, 1,
0);
}
/* This handles too-large rsplen values (including ones > 2^31-1) */
if (flags & 0x2) {
tvb_ensure_bytes_exist (tvb, offset+24, rsplen);
offset += 24+rsplen;
dissect_scsi_snsinfo (tvb, pinfo, tree, offset,
snslen,
(guint16) (cdata?cdata->fcp_lun:0xffff) );
}
/* This handles too-large snslen values (including ones > 2^31-1) */
tvb_ensure_bytes_exist (tvb, offset, snslen);
offset += snslen;
proto_item_set_end (ti, tvb, offset);
if (cdata) {
/*
* XXX - this isn't done if an exception is thrown.
*/
g_hash_table_remove (fcp_req_hash, &ckey);
}
}
}
static void
dissect_fcp_xfer_rdy (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
proto_item *ti;
proto_tree *fcp_tree;
guint del_usecs;
conversation_t *conversation;
fcp_conv_data_t *cdata = NULL;
fcp_conv_key_t ckey, *req_key;
/* Retrieve conversation state to determine expected payload */
conversation = find_conversation (pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->oxid,
pinfo->rxid, NO_PORT2);
if (!conversation) {
conversation = conversation_new (pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->oxid,
pinfo->rxid, NO_PORT2);
}
if (conversation) {
ckey.conv_idx = conversation->index;
cdata = (fcp_conv_data_t *)g_hash_table_lookup (fcp_req_hash,
&ckey);
if (cdata != NULL) {
cdata->fcp_dl = tvb_get_ntohl (tvb, offset+4);
}
else {
req_key = se_alloc (sizeof(fcp_conv_key_t));
req_key->conv_idx = conversation->index;
cdata = se_alloc (sizeof(fcp_conv_data_t));
cdata->fcp_dl = tvb_get_ntohl (tvb, offset+4);
cdata->fcp_lun = -1;
g_hash_table_insert (fcp_req_hash, req_key, cdata);
}
}
if (tree) {
ti = proto_tree_add_protocol_format (tree, proto_fcp, tvb, 0, 12,
"FCP_XFER_RDY");
fcp_tree = proto_item_add_subtree (ti, ett_fcp);
proto_tree_add_uint_hidden (fcp_tree, hf_fcp_type, tvb, offset, 0, 0);
if (cdata) {
/* XXX - this is ugly and should be replaced by a "standard way" */
del_usecs = (pinfo->fd->abs_ts.secs - cdata->abs_ts.secs)* 1000000 +
(pinfo->fd->abs_ts.nsecs - cdata->abs_ts.nsecs) / 1000;
if (del_usecs > 1000)
proto_tree_add_text (fcp_tree, tvb, offset, 0,
"Cmd Response Time: %d msecs",
del_usecs/1000);
else
proto_tree_add_text (fcp_tree, tvb, offset, 0,
"Cmd Response Time: %d usecs",
del_usecs);
if (cdata->fcp_lun >= 0)
proto_tree_add_uint_hidden (fcp_tree, hf_fcp_singlelun, tvb,
offset, 0, cdata->fcp_lun);
}
proto_tree_add_item (fcp_tree, hf_fcp_data_ro, tvb, offset, 4, 0);
proto_tree_add_item (fcp_tree, hf_fcp_burstlen, tvb, offset+4, 4, 0);
}
}
static void
dissect_fcp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Set up structures needed to add the protocol subtree and manage it */
guint8 r_ctl;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCP");
r_ctl = pinfo->r_ctl;
r_ctl &= 0xF;
if (check_col (pinfo->cinfo, COL_INFO)) {
col_set_str (pinfo->cinfo, COL_INFO, val_to_str (r_ctl, fcp_iu_val,
"0x%x"));
}
switch (r_ctl) {
case FCP_IU_DATA:
dissect_fcp_data (tvb, pinfo, tree);
break;
case FCP_IU_CONFIRM:
/* Nothing to be done here */
break;
case FCP_IU_XFER_RDY:
dissect_fcp_xfer_rdy (tvb, pinfo, tree);
break;
case FCP_IU_CMD:
dissect_fcp_cmnd (tvb, pinfo, tree);
break;
case FCP_IU_RSP:
dissect_fcp_rsp (tvb, pinfo, tree);
break;
default:
call_dissector (data_handle, tvb, pinfo, tree);
break;
}
}
/* Register the protocol with Ethereal */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_fcp (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_fcp_type,
{"Field to branch off to SCSI", "fcp.type", FT_UINT8, BASE_HEX, NULL,
0x0, "", HFILL}},
{&hf_fcp_multilun,
{"Multi-Level LUN", "fcp.multilun", FT_BYTES, BASE_HEX, NULL, 0x0,
"", HFILL}},
{ &hf_fcp_singlelun,
{"LUN", "fcp.lun", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}},
{ &hf_fcp_crn,
{"Command Ref Num", "fcp.crn", FT_UINT8, BASE_DEC, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_taskattr,
{"Task Attribute", "fcp.taskattr", FT_UINT8, BASE_HEX,
VALS (fcp_task_attr_val), 0x7, "", HFILL}},
{ &hf_fcp_taskmgmt,
{"Task Management Flags", "fcp.taskmgmt", FT_UINT8, BASE_HEX, NULL,
0x0, "", HFILL}},
{ &hf_fcp_addlcdblen,
{"Additional CDB Length", "fcp.addlcdblen", FT_UINT8, BASE_DEC, NULL,
0xFC, "", HFILL}},
{ &hf_fcp_rddata,
{"RDDATA", "fcp.rddata", FT_BOOLEAN, 8, NULL, 0x02, "", HFILL}},
{ &hf_fcp_wrdata,
{"WRDATA", "fcp.wrdata", FT_BOOLEAN, 8, NULL, 0x01, "", HFILL}},
{ &hf_fcp_dl,
{"FCP_DL", "fcp.dl", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL}},
{ &hf_fcp_data_ro,
{"FCP_DATA_RO", "fcp.data_ro", FT_UINT32, BASE_DEC, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_burstlen,
{"Burst Length", "fcp.burstlen", FT_UINT32, BASE_DEC, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_rspflags,
{"FCP_RSP Flags", "fcp.rspflags", FT_UINT8, BASE_HEX, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_resid,
{"FCP_RESID", "fcp.resid", FT_UINT32, BASE_DEC, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_snslen,
{"FCP_SNS_LEN", "fcp.snslen", FT_UINT32, BASE_DEC, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_rsplen,
{"FCP_RSP_LEN", "fcp.rsplen", FT_UINT32, BASE_DEC, NULL, 0x0, "",
HFILL}},
{ &hf_fcp_rspcode,
{"RSP_CODE", "fcp.rspcode", FT_UINT8, BASE_HEX,
VALS (fcp_rsp_code_val), 0x0, "", HFILL}},
{ &hf_fcp_scsistatus,
{"SCSI Status", "fcp.status", FT_UINT8, BASE_HEX,
VALS (scsi_status_val), 0x0, "", HFILL}},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_fcp,
};
/* Register the protocol name and description */
proto_fcp = proto_register_protocol("Fibre Channel Protocol for SCSI",
"FCP", "fcp");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_fcp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
fcp_dissector = register_dissector_table ("fcp.type", "FCP Type", FT_UINT8,
BASE_HEX);
register_init_routine (&fcp_init_protocol);
}
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_fcp (void)
{
dissector_handle_t fcp_handle;
fcp_handle = create_dissector_handle (dissect_fcp, proto_fcp);
dissector_add("fc.ftype", FC_FTYPE_SCSI, fcp_handle);
data_handle = find_dissector ("data");
}
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