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wireshark/plugins/docsis/packet-dccrsp.c

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/* packet-dccrsp.c
* Routines for DCC Response 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_dccrsp(void);
void proto_reg_handoff_docsis_dccrsp(void);
#define DCCRSP_CM_JUMP_TIME 1
#define DCCRSP_KEY_SEQ_NUM 31
#define DCCRSP_HMAC_DIGEST 27
/* Define DCC-RSP CM Jump Time subtypes
* These are subtype of DCCRSP_CM_JUMP_TIME (1)
*/
#define DCCRSP_CM_JUMP_TIME_LENGTH 1
#define DCCRSP_CM_JUMP_TIME_START 2
/* Initialize the protocol and registered fields */
static int proto_docsis_dccrsp = -1;
static int hf_docsis_dccrsp_tran_id = -1;
static int hf_docsis_dccrsp_conf_code = -1;
static int hf_docsis_dccrsp_cm_jump_time_length = -1;
static int hf_docsis_dccrsp_cm_jump_time_start = -1;
static int hf_docsis_dccrsp_key_seq_num = -1;
static int hf_docsis_dccrsp_hmac_digest = -1;
/* Initialize the subtree pointers */
static gint ett_docsis_dccrsp = -1;
static gint ett_docsis_dccrsp_cm_jump_time = -1;
/* Dissection */
static void
dissect_dccrsp_cm_jump_time (tvbuff_t * tvb, proto_tree * tree, int start, guint16 len)
{
guint8 type, length;
proto_tree *dcc_tree;
int pos;
pos = start;
dcc_tree = proto_tree_add_subtree_format( tree, tvb, start, len, ett_docsis_dccrsp_cm_jump_time, NULL,
"2 DCC-RSP CM Time Jump Encodings (Length = %u)", len);
while ( pos < ( start + len) )
{
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_guint8 (tvb, pos++);
switch (type)
{
case DCCRSP_CM_JUMP_TIME_LENGTH:
if (length == 4)
{
proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_length, tvb,
pos, length, ENC_BIG_ENDIAN);
}
else
{
THROW (ReportedBoundsError);
}
break;
case DCCRSP_CM_JUMP_TIME_START:
if (length == 8)
{
proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_start, tvb,
pos, length, ENC_BIG_ENDIAN);
}
else
{
THROW (ReportedBoundsError);
}
break;
}
pos = pos + length;
}
}
static void
dissect_dccrsp (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);
col_set_str(pinfo->cinfo, COL_INFO, "DCC-RSP Message: ");
if (tree)
{
dcc_item =
proto_tree_add_protocol_format (tree, proto_docsis_dccrsp, tvb, 0,
-1, "DCC-RSP Message");
dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccrsp);
proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_tran_id, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_conf_code, tvb, 2, 1, ENC_BIG_ENDIAN);
pos = 3;
while (pos < len)
{
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_guint8 (tvb, pos++);
switch (type)
{
case DCCRSP_CM_JUMP_TIME:
dissect_dccrsp_cm_jump_time (tvb , dcc_tree , pos , length );
break;
case DCCRSP_KEY_SEQ_NUM:
if (length == 1)
{
proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_key_seq_num, tvb,
pos, length, ENC_BIG_ENDIAN);
}
else
{
THROW (ReportedBoundsError);
}
break;
case DCCRSP_HMAC_DIGEST:
if (length == 20)
{
proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_hmac_digest, tvb,
pos, length, ENC_NA);
}
else
{
THROW (ReportedBoundsError);
}
break;
} /* switch(type) */
pos = pos + length;
} /* while (pos < len) */
} /* if (tree) */
}
/* Register the protocol with Wireshark */
void
proto_register_docsis_dccrsp (void)
{
static hf_register_info hf[] = {
{&hf_docsis_dccrsp_tran_id ,
{
"Transaction ID",
"docsis_dccrsp.tran_id",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccrsp_conf_code ,
{
"Confirmation Code",
"docsis_dccrsp.conf_code",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccrsp_cm_jump_time_length ,
{
"Jump Time Length",
"docsis_dccrsp.cm_jump_time_length",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccrsp_cm_jump_time_start ,
{
"Jump Time Start",
"docsis_dccrsp.cm_jump_time_start",
FT_UINT64, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccrsp_key_seq_num ,
{
"Auth Key Sequence Number",
"docsis_dccrsp.key_seq_num",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{&hf_docsis_dccrsp_hmac_digest ,
{
"HMAC-DigestNumber",
"docsis_dccrsp.hmac_digest",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL,
HFILL
}
},
};
static gint *ett[] = {
&ett_docsis_dccrsp,
&ett_docsis_dccrsp_cm_jump_time,
};
proto_docsis_dccrsp =
proto_register_protocol ("DOCSIS Downstream Channel Change Response",
"DOCSIS DCC-RSP", "docsis_dccrsp");
proto_register_field_array (proto_docsis_dccrsp, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_dissector ("docsis_dccrsp", dissect_dccrsp, proto_docsis_dccrsp);
}
void
proto_reg_handoff_docsis_dccrsp (void)
{
dissector_handle_t docsis_dccrsp_handle;
docsis_dccrsp_handle = find_dissector ("docsis_dccrsp");
dissector_add_uint ("docsis_mgmt", 0x18, docsis_dccrsp_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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