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/* packet-dscack.c
* Routines for Dynamic Service Change Acknowledge dissection
* Copyright 2002, Anand V. Narwani <anarwani@cisco.com>
*
* 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 "plugins/plugin_api.h"
#include "plugins/plugin_api_defs.h"
#include "moduleinfo.h"
#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 <gmodule.h>
#include <epan/packet.h>
/* Initialize the protocol and registered fields */
static int proto_docsis_dscack = -1;
static int hf_docsis_dscack = -1;
static int hf_docsis_dscack_tranid = -1;
static int hf_docsis_dscack_response = -1;
static dissector_handle_t docsis_tlv_handle;
/* Initialize the subtree pointers */
static gint ett_docsis_dscack = -1;
extern value_string docsis_conf_code[];
/* Code to actually dissect the packets */
static void
dissect_dscack (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
proto_item *it;
proto_tree *dscack_tree;
guint16 transid;
guint16 tlv_data_len;
guint8 response;
tvbuff_t *next_tvb;
transid = tvb_get_ntohs (tvb, 0);
response = tvb_get_guint8 (tvb, 2);
tlv_data_len = tvb_length_remaining (tvb, 3);
if (check_col (pinfo->cinfo, COL_INFO))
{
col_clear (pinfo->cinfo, COL_INFO);
col_add_fstr (pinfo->cinfo, COL_INFO,
"Dynamic Service Change Ack ID = %u (%s)", transid,
val_to_str (response, docsis_conf_code, "%s"));
}
if (tree)
{
it =
proto_tree_add_protocol_format (tree, proto_docsis_dscack, tvb, 0,
tvb_length_remaining (tvb, 0),
"DSC Acknowledge");
dscack_tree = proto_item_add_subtree (it, ett_docsis_dscack);
proto_tree_add_item (dscack_tree, hf_docsis_dscack_tranid, tvb, 0, 2,
FALSE);
proto_tree_add_item (dscack_tree, hf_docsis_dscack_response, tvb, 2, 1,
FALSE);
/* Call Dissector for Appendix C TLV's */
next_tvb = tvb_new_subset (tvb, 3, tlv_data_len, tlv_data_len);
call_dissector (docsis_tlv_handle, next_tvb, pinfo, dscack_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_dscack (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{&hf_docsis_dscack,
{"Dynamic Service Change Ack", "docsis.dscack",
FT_BYTES, BASE_HEX, NULL, 0x0,
"Dynamic Service Add Request", HFILL}
},
{&hf_docsis_dscack_tranid,
{"Transaction Id", "docsis.dscack.tranid",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Service Identifier", HFILL}
},
{&hf_docsis_dscack_response,
{"Confirmation Code", "docsis.dscack.confcode",
FT_UINT8, BASE_DEC, VALS (docsis_conf_code), 0x0,
"Confirmation Code", HFILL}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_docsis_dscack,
};
/* Register the protocol name and description */
proto_docsis_dscack =
proto_register_protocol ("DOCSIS Dynamic Service Change Acknowledgement",
"DOCSIS DSC-ACK", "docsis_dscack");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array (proto_docsis_dscack, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
register_dissector ("docsis_dscack", dissect_dscack, proto_docsis_dscack);
}
/* 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_dscack (void)
{
dissector_handle_t docsis_dscack_handle;
docsis_dscack_handle = find_dissector ("docsis_dscack");
docsis_tlv_handle = find_dissector ("docsis_tlv");
dissector_add ("docsis_mgmt", 0x14, docsis_dscack_handle);
}
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