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/* packet-dccack.c
* Routines for DCC Acknowledge Message dissection
* Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.com>
*
* $Id$
*
* 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 "moduleinfo.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gmodule.h>
#include <epan/packet.h>
#define DCCACK_KEY_SEQ_NUM 31
#define DCCACK_HMAC_DIGEST 27
/* Initialize the protocol and registered fields */
static int proto_docsis_dccack = -1;
static int hf_docsis_dccack_tran_id = -1;
static int hf_docsis_dccack_key_seq_num = -1;
static int hf_docsis_dccack_hmac_digest = -1;
/* Initialize the subtree pointers */
static gint ett_docsis_dccack = -1;
/* Code to actually dissect the packets */
static void
dissect_dccack (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
guint16 pos;
guint8 type, length;
proto_tree *dcc_tree;
proto_item *dcc_item;
guint16 len;
len = tvb_length_remaining (tvb, 0);
if (check_col (pinfo->cinfo, COL_INFO))
{
col_clear (pinfo->cinfo, COL_INFO);
col_add_fstr (pinfo->cinfo, COL_INFO,"DCC-ACK Message: ");
}
if (tree)
{
dcc_item =
proto_tree_add_protocol_format (tree, proto_docsis_dccack, tvb, 0,
tvb_length_remaining (tvb, 0),
"DCC-ACK Message");
dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccack);
proto_tree_add_item (dcc_tree, hf_docsis_dccack_tran_id, tvb, 0, 2, FALSE);
pos = 2;
while (pos < len)
{
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_guint8 (tvb, pos++);
switch (type)
{
case DCCACK_KEY_SEQ_NUM:
if (length == 1)
{
proto_tree_add_item (dcc_tree, hf_docsis_dccack_key_seq_num, tvb,
pos, length, FALSE);
}
else
{
THROW (ReportedBoundsError);
}
break;
case DCCACK_HMAC_DIGEST:
if (length == 20)
{
proto_tree_add_item (dcc_tree, hf_docsis_dccack_hmac_digest, tvb,
pos, length, FALSE);
}
else
{
THROW (ReportedBoundsError);
}
break;
} /* switch(type) */
pos = pos + length;
} /* while (pos < len) */
} /* if (tree) */
}
/* 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_docsis_dccack (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{&hf_docsis_dccack_tran_id ,
{
"Transaction ID ",
"docsis.dccack.tran_id",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Transaction ID ",
HFILL
}
},
{&hf_docsis_dccack_key_seq_num ,
{
"Auth Key Sequence Number ",
"docsis.dccack.key_seq_num",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Auth Key Sequence Number ",
HFILL
}
},
{&hf_docsis_dccack_hmac_digest ,
{
"HMAC-DigestNumber ",
"docsis.dccack.hmac_digest",
FT_BYTES, BASE_DEC, NULL, 0x0,
"HMAC-DigestNumber ",
HFILL
}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_docsis_dccack,
};
/* Register the protocol name and description */
proto_docsis_dccack =
proto_register_protocol ("DOCSIS Downstream Channel Change Acknowledge ",
"DOCSIS DCC-ACK", "docsis_dccack");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array (proto_docsis_dccack, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_dissector ("docsis_dccack", dissect_dccack, proto_docsis_dccack);
}
/* 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_docsis_dccack (void)
{
dissector_handle_t docsis_dccack_handle;
docsis_dccack_handle = find_dissector ("docsis_dccack");
dissector_add ("docsis_mgmt", 0x19, docsis_dccack_handle);
}
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