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wireshark/plugins/docsis/packet-vendor.c

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/* packet-vendor.c
* Routines for Vendor Specific Encodings dissection
* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
*
* 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.
*/
/* Notes to Adding dissectors for Vendor specific TLV's:
* 1. Create a dissect_<vendorname> function with the following prototype:
* dissect_foovendor(tvbuff_t *tvb, proto_tree *tree, gint vsif_len)
* 2. vsif_len will be the *entire* length of the vsif TLV (including the
* Vendor Id TLV, which is 5 bytes long).
* 3. Create a new 'case' statement in dissect_vsif, for your specific Vendor
* id.
* 4. In that 'case' statement you will make the following calls:
* (assume for this example that your vendor id is 0x000054)
* #define VENDOR_FOOVENDOR 0x00054
* case VENDOR_FOOVENDOR:
* proto_item_append_text (it, " (foo vendor)");
* dissect_foovendor (tvb, vsif_tree, vsif_len);
* break;
* 5. Please see dissect_cisco for an example of how to do this.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/exceptions.h>
/* Define Vendor ID's here */
#define VENDOR_CISCO 0x00000C
void proto_register_docsis_vsif(void);
void proto_reg_handoff_docsis_vsif(void);
/* Initialize the protocol and registered fields */
static int proto_docsis_vsif = -1;
static int hf_docsis_vsif_vendorid = -1;
static int hf_docsis_vsif_vendor_unknown = -1;
static int hf_docsis_vsif_cisco_numphones = -1;
/* static int hf_docsis_vsif_cisco_ipprec = -1; */
static int hf_docsis_vsif_cisco_ipprec_val = -1;
static int hf_docsis_vsif_cisco_ipprec_bw = -1;
static int hf_docsis_vsif_cisco_config_file = -1;
/* Initialize the subtree pointers */
static gint ett_docsis_vsif = -1;
static gint ett_docsis_vsif_ipprec = -1;
static const value_string vendorid_vals[] = {
{VENDOR_CISCO, "Cisco Systems, Inc."},
{0, NULL},
};
/* Forward Declarations for vendor specific dissectors */
static void dissect_cisco (tvbuff_t * tvb, proto_tree * tree,
gint vsif_len);
/* Dissection */
static int
dissect_vsif (tvbuff_t * tvb, packet_info * pinfo _U_, proto_tree * tree, void* data _U_)
{
proto_item *it;
proto_tree *vsif_tree;
guint8 type;
guint8 length;
guint32 value;
gint vsif_len;
/* get the reported length of the VSIF TLV */
vsif_len = tvb_reported_length_remaining (tvb, 0);
/* The first TLV in the VSIF encodings must be type 0x08 (Vendor ID) and
* length 3.
*/
type = tvb_get_guint8 (tvb, 0);
if (type != 0x08)
{
THROW (ReportedBoundsError);
}
length = tvb_get_guint8 (tvb, 1);
if (length != 3)
{
THROW (ReportedBoundsError);
}
/* Extract the Value of the Vendor ID */
value = tvb_get_ntoh24 (tvb, 2);
if (tree)
{
it =
proto_tree_add_protocol_format (tree, proto_docsis_vsif, tvb, 0, -1,
"VSIF Encodings");
vsif_tree = proto_item_add_subtree (it, ett_docsis_vsif);
proto_tree_add_item (vsif_tree, hf_docsis_vsif_vendorid, tvb, 2, 3, ENC_BIG_ENDIAN);
/* switch on the Vendor ID */
switch (value)
{
case VENDOR_CISCO:
proto_item_append_text (it, " (Cisco)");
dissect_cisco (tvb, vsif_tree, vsif_len);
break;
default:
proto_item_append_text (it, " (Unknown)");
proto_tree_add_item (vsif_tree, hf_docsis_vsif_vendor_unknown, tvb,
0, -1, ENC_NA);
break;
}
} /* if(tree) */
return tvb_captured_length(tvb);
}
/* Dissector for Cisco Vendor Specific TLV's */
#define NUM_PHONES 0x0a
#define IOS_CONFIG_FILE 0x80
#define IP_PREC 0x0b
#define IP_PREC_VAL 0x01
#define IP_PREC_BW 0x02
static void
dissect_cisco (tvbuff_t * tvb, proto_tree * tree, gint vsif_len)
{
/* Start at pos = 5, since tvb includes the Vendor ID field */
int pos = 5;
guint8 type, length;
proto_tree *ipprec_tree;
int templen;
while (pos < vsif_len)
{
/* Extract the type and length Fields from the TLV */
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_guint8 (tvb, pos++);
switch (type)
{
case NUM_PHONES:
proto_tree_add_item (tree, hf_docsis_vsif_cisco_numphones, tvb,
pos, length, ENC_BIG_ENDIAN);
break;
case IP_PREC:
ipprec_tree =
proto_tree_add_subtree(tree, tvb, pos, length, ett_docsis_vsif_ipprec, NULL, "IP Precedence");
/* Handle Sub-TLVs in IP Precedence */
templen = pos + length;
while (pos < templen)
{
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_guint8 (tvb, pos++);
switch (type)
{
case IP_PREC_VAL:
if (length != 1)
THROW (ReportedBoundsError);
proto_tree_add_item (ipprec_tree,
hf_docsis_vsif_cisco_ipprec_val, tvb,
pos, length, ENC_BIG_ENDIAN);
break;
case IP_PREC_BW:
if (length != 4)
THROW (ReportedBoundsError);
proto_tree_add_item (ipprec_tree,
hf_docsis_vsif_cisco_ipprec_bw, tvb,
pos, length, ENC_BIG_ENDIAN);
break;
default:
THROW (ReportedBoundsError);
}
pos += length;
}
break;
case IOS_CONFIG_FILE:
proto_tree_add_item (tree, hf_docsis_vsif_cisco_config_file, tvb,
pos, length, ENC_ASCII|ENC_NA);
}
pos += length;
}
}
/* Register the protocol with Wireshark */
void
proto_register_docsis_vsif (void)
{
static hf_register_info hf[] = {
{&hf_docsis_vsif_vendorid,
{"Vendor Id", "docsis_vsif.vendorid",
FT_UINT24, BASE_HEX, VALS(vendorid_vals), 0x0,
"Vendor Identifier", HFILL}
},
{&hf_docsis_vsif_vendor_unknown,
{"VSIF Encodings", "docsis_vsif.unknown",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Unknown Vendor", HFILL}
},
{&hf_docsis_vsif_cisco_numphones,
{"Number of phone lines", "docsis_vsif.cisco.numphones",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
#if 0
{&hf_docsis_vsif_cisco_ipprec,
{"IP Precedence Encodings", "docsis_vsif.cisco.ipprec",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL}
},
#endif
{&hf_docsis_vsif_cisco_ipprec_val,
{"IP Precedence Value", "docsis_vsif.cisco.ipprec.value",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_vsif_cisco_ipprec_bw,
{"IP Precedence Bandwidth", "docsis_vsif.cisco.ipprec.bw",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_docsis_vsif_cisco_config_file,
{"IOS Config File", "docsis_vsif.cisco.iosfile",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL}
},
};
static gint *ett[] = {
&ett_docsis_vsif,
&ett_docsis_vsif_ipprec,
};
proto_docsis_vsif =
proto_register_protocol ("DOCSIS Vendor Specific Encodings",
"DOCSIS VSIF", "docsis_vsif");
proto_register_field_array (proto_docsis_vsif, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
new_register_dissector ("docsis_vsif", dissect_vsif, proto_docsis_vsif);
}
void
proto_reg_handoff_docsis_vsif (void)
{
#if 0
dissector_handle_t docsis_vsif_handle;
docsis_vsif_handle = find_dissector ("docsis_vsif");
dissector_add_uint ("docsis", 0xFD, docsis_vsif_handle);
#endif
}
/*
* 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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