![Guy Harris](/assets/img/avatar_default.png)
than32 bits risks overflow problems). Use "gint" for tvbuff lengths. Use -1 for uses of "tvb_length_remaining()" that mean "the rest of the tvbuff"; use "tvb_reported_length_remaining()" for "the rest of the packet. Clean up the handling of the DOCSIS payload. svn path=/trunk/; revision=9267
321 lines
8.8 KiB
C
321 lines
8.8 KiB
C
/* packet-vendor.c
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* Routines for Vendor Specific Encodings dissection
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* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
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*
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* $Id: packet-vendor.c,v 1.6 2003/12/13 03:18:38 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Notes to Adding dissectors for Vendor specific TLV's:
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* 1. Create a dissect_<vendorname> function with the following prototype:
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* dissect_foovendor(tvbuff_t *tvb, proto_tree *tree, gint vsif_len)
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* 2. vsif_len will be the *entire* length of the vsif TLV (including the
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* Vendor Id TLV, which is 5 bytes long).
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* 3. Create a new 'case' statement in dissect_vsif, for your specific Vendor
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* id.
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* 4. In that 'case' statement you will make the following calls:
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* (assume for this example that your vendor id is 0x000054)
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* #define VENDOR_FOOVENDOR 0x00054
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* case VENDOR_FOOVENDOR:
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* proto_item_append_text (it, " (foo vendor)");
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* dissect_foovendor (tvb, vsif_tree, vsif_len);
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* break;
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* 5. Please see dissect_cisco for an example of how to do this.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "plugins/plugin_api.h"
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#include "plugins/plugin_api_defs.h"
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#include "moduleinfo.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <gmodule.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include <epan/packet.h>
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/* Define Vendor ID's here */
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#define VENDOR_CISCO 0x00000C
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/* Initialize the protocol and registered fields */
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static int proto_docsis_vsif = -1;
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static int hf_docsis_vsif = -1;
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static int hf_docsis_vsif_vendorid = -1;
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static int hf_docsis_vsif_vendor_unknown = -1;
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static int hf_docsis_vsif_cisco_numphones = -1;
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static int hf_docsis_vsif_cisco_ipprec = -1;
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static int hf_docsis_vsif_cisco_ipprec_val = -1;
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static int hf_docsis_vsif_cisco_ipprec_bw = -1;
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static int hf_docsis_vsif_cisco_config_file = -1;
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/* Initialize the subtree pointers */
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static gint ett_docsis_vsif = -1;
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static gint ett_docsis_vsif_ipprec = -1;
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static const value_string vendorid_vals[] = {
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{VENDOR_CISCO, "Cisco Systems, Inc."},
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{0, NULL},
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};
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/* Forward Declarations for vendor specific dissectors */
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static void dissect_cisco (tvbuff_t * tvb, proto_tree * tree,
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gint vsif_len);
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/* Code to actually dissect the packets */
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static void
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dissect_vsif (tvbuff_t * tvb, packet_info * pinfo _U_, proto_tree * tree)
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{
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proto_item *it;
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proto_tree *vsif_tree;
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guint8 type;
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guint8 length;
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guint32 value;
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gint vsif_len;
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/* get the reported length of the VSIF TLV */
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vsif_len = tvb_reported_length_remaining (tvb, 0);
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/* The first TLV in the VSIF encodings must be type 0x08 (Vendor ID) and
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* length 3.
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*/
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type = tvb_get_guint8 (tvb, 0);
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if (type != 0x08)
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{
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THROW (ReportedBoundsError);
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}
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length = tvb_get_guint8 (tvb, 1);
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if (length != 3)
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{
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THROW (ReportedBoundsError);
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}
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/* Extract the Value of the Vendor ID */
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value = tvb_get_ntoh24 (tvb, 2);
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if (tree)
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{
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it =
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proto_tree_add_protocol_format (tree, proto_docsis_vsif, tvb, 0, -1,
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"VSIF Encodings");
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vsif_tree = proto_item_add_subtree (it, ett_docsis_vsif);
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proto_tree_add_item (vsif_tree, hf_docsis_vsif_vendorid, tvb, 2, 3, FALSE);
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/* switch on the Vendor ID */
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switch (value)
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{
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case VENDOR_CISCO:
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proto_item_append_text (it, " (Cisco)");
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dissect_cisco (tvb, vsif_tree, vsif_len);
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break;
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default:
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proto_item_append_text (it, " (Unknown)");
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proto_tree_add_item (vsif_tree, hf_docsis_vsif_vendor_unknown, tvb,
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0, -1, FALSE);
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break;
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}
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} /* if(tree) */
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}
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/* Dissector for Cisco Vendor Specific TLV's */
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#define NUM_PHONES 0x0a
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#define IOS_CONFIG_FILE 0x80
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#define IP_PREC 0x0b
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#define IP_PREC_VAL 0x01
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#define IP_PREC_BW 0x02
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static void
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dissect_cisco (tvbuff_t * tvb, proto_tree * tree, gint vsif_len)
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{
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/* Start at pos = 5, since tvb includes the Vendor ID field */
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int pos = 5;
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guint8 type, length;
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proto_item *ipprec_it;
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proto_tree *ipprec_tree;
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int templen;
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while (pos < vsif_len)
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{
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/* Extract the type and length Fields from the TLV */
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case NUM_PHONES:
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proto_tree_add_item (tree, hf_docsis_vsif_cisco_numphones, tvb,
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pos, length, FALSE);
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break;
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case IP_PREC:
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ipprec_it =
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proto_tree_add_text (tree, tvb, pos, length, "IP Precedence");
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ipprec_tree =
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proto_item_add_subtree (ipprec_it, ett_docsis_vsif_ipprec);
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/* Handle Sub-TLVs in IP Precedence */
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templen = pos + length;
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while (pos < templen)
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_guint8 (tvb, pos++);
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switch (type)
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{
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case IP_PREC_VAL:
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if (length != 1)
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THROW (ReportedBoundsError);
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proto_tree_add_item (ipprec_tree,
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hf_docsis_vsif_cisco_ipprec_val, tvb,
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pos, length, FALSE);
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break;
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case IP_PREC_BW:
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if (length != 4)
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THROW (ReportedBoundsError);
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proto_tree_add_item (ipprec_tree,
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hf_docsis_vsif_cisco_ipprec_bw, tvb,
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pos, length, FALSE);
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break;
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default:
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THROW (ReportedBoundsError);
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}
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pos += length;
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}
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break;
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case IOS_CONFIG_FILE:
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proto_tree_add_item (tree, hf_docsis_vsif_cisco_config_file, tvb,
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pos, length, FALSE);
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}
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pos += length;
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}
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}
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/* Register the protocol with Ethereal */
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_docsis_vsif (void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{&hf_docsis_vsif,
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{"VSIF Encodings", "docsis.vsif",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"Vendor Specific Encodings", HFILL}
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},
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{&hf_docsis_vsif_vendorid,
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{"Vendor Id", "docsis.vsif.vendorid",
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FT_UINT24, BASE_HEX, VALS(vendorid_vals), 0x0,
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"Vendor Identifier", HFILL}
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},
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{&hf_docsis_vsif_vendor_unknown,
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{"VSIF Encodings", "docsis.vsif.unknown",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"Unknown Vendor", HFILL}
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},
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{&hf_docsis_vsif_cisco_numphones,
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{"Number of phone lines", "docsis.vsif.cisco.numphones",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"Number of phone lines", HFILL}
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},
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{&hf_docsis_vsif_cisco_ipprec,
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{"IP Precedence Encodings", "docsis.vsif.cisco.ipprec",
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FT_BYTES, BASE_HEX, NULL, 0x0,
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"IP Precedence Encodings", HFILL}
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},
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{&hf_docsis_vsif_cisco_ipprec_val,
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{"IP Precedence Value", "docsis.vsif.cisco.ipprec.value",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"IP Precedence Value", HFILL}
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},
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{&hf_docsis_vsif_cisco_ipprec_bw,
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{"IP Precedence Bandwidth", "docsis.vsif.cisco.ipprec.bw",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"IP Precedence Bandwidth", HFILL}
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},
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{&hf_docsis_vsif_cisco_config_file,
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{"IOS Config File", "docsis.vsif.cisco.iosfile",
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FT_STRING, BASE_DEC, NULL, 0x0,
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"IOS Config File", HFILL}
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_docsis_vsif,
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&ett_docsis_vsif_ipprec,
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};
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/* Register the protocol name and description */
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proto_docsis_vsif =
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proto_register_protocol ("DOCSIS Vendor Specific Endodings",
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"DOCSIS VSIF", "docsis_vsif");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array (proto_docsis_vsif, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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register_dissector ("docsis_vsif", dissect_vsif, proto_docsis_vsif);
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_docsis_vsif (void)
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{
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dissector_handle_t docsis_vsif_handle;
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docsis_vsif_handle = find_dissector ("docsis_vsif");
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dissector_add ("docsis", 0xFD, docsis_vsif_handle);
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}
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