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/* packet-dccack.c
* Routines for DCC Acknowledge Message dissection
* Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.com>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/exceptions.h>
void proto_register_docsis_dccack(void);
void proto_reg_handoff_docsis_dccack(void);
#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;
static dissector_handle_t docsis_dccack_handle;
/* Dissection */
static int
dissect_dccack (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
{
guint16 pos;
guint8 type, length;
proto_tree *dcc_tree;
proto_item *dcc_item;
guint16 len;
len = tvb_reported_length(tvb);
col_set_str(pinfo->cinfo, COL_INFO, "DCC-ACK Message: ");
if (tree)
{
dcc_item =
proto_tree_add_protocol_format (tree, proto_docsis_dccack, tvb, 0,
-1, "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, ENC_BIG_ENDIAN);
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, ENC_BIG_ENDIAN);
}
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, ENC_NA);
}
else
{
THROW (ReportedBoundsError);
}
break;
} /* switch(type) */
pos = pos + length;
} /* while (pos < len) */
} /* if (tree) */
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_docsis_dccack (void)
{
static hf_register_info hf[] = {
{&hf_docsis_dccack_tran_id ,
{
"Transaction ID",
"docsis_dccack.tran_id",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccack_key_seq_num ,
{
"Auth Key Sequence Number",
"docsis_dccack.key_seq_num",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccack_hmac_digest ,
{
"HMAC-DigestNumber",
"docsis_dccack.hmac_digest",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL,
HFILL
}
},
};
static gint *ett[] = {
&ett_docsis_dccack,
};
proto_docsis_dccack =
proto_register_protocol ("DOCSIS Downstream Channel Change Acknowledge",
"DOCSIS DCC-ACK", "docsis_dccack");
proto_register_field_array (proto_docsis_dccack, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
docsis_dccack_handle = register_dissector ("docsis_dccack", dissect_dccack, proto_docsis_dccack);
}
void
proto_reg_handoff_docsis_dccack (void)
{
dissector_add_uint ("docsis_mgmt", 0x19, docsis_dccack_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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