forked from osmocom/wireshark
319 lines
9.3 KiB
C
319 lines
9.3 KiB
C
/* packet-cdp.c
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* Routines for the disassembly of the "Cisco Discovery Protocol"
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* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
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*
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* $Id: packet-cdp.c,v 1.17 1999/11/16 11:42:28 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#include "config.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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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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/* Offsets in TLV structure. */
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#define TLV_TYPE 0
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#define TLV_LENGTH 2
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static int proto_cdp = -1;
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static int hf_cdp_version = -1;
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static int hf_cdp_flags = -1;
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static int hf_cdp_ttl = -1;
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static int hf_cdp_tlvtype = -1;
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static int hf_cdp_tlvlength = -1;
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static gint ett_cdp = -1;
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static gint ett_cdp_tlv = -1;
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static void
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add_multi_line_string_to_tree(proto_tree *tree, gint start, gint len,
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const gchar *prefix, const gchar *string);
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#define TYPE_MGMT_ADDR 0
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#define TYPE_CHASSIS_ID 1
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#define TYPE_2 2
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#define TYPE_PORT 3
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#define TYPE_IOS_VERSION 5
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#define TYPE_PLATFORM 6
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#define TYPE_MGMT_IP_ADDR 0x01cc
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static const value_string type_vals[] = {
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{ TYPE_MGMT_ADDR, "Mgmt addr?" },
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{ TYPE_CHASSIS_ID, "Chassis ID" },
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{ TYPE_2, "Unknown" },
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{ TYPE_PORT, "Port" },
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{ TYPE_IOS_VERSION, "Software version" },
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{ TYPE_PLATFORM, "Platform" },
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{ TYPE_MGMT_IP_ADDR, "Mgmt IP" },
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{ 0, NULL },
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};
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void
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dissect_cdp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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proto_item *ti;
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proto_tree *cdp_tree = NULL;
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guint16 type;
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guint16 length;
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char *type_str;
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char *stringmem;
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proto_item *tlvi;
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proto_tree *tlv_tree;
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "CDP");
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if (check_col(fd, COL_INFO))
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col_add_str(fd, COL_INFO, "Cisco Discovery Protocol");
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if(tree){
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ti = proto_tree_add_item(tree, proto_cdp, offset, END_OF_FRAME, NULL);
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cdp_tree = proto_item_add_subtree(ti, ett_cdp);
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/* CDP header */
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proto_tree_add_item(cdp_tree, hf_cdp_version, offset, 1, pd[offset]);
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offset += 1;
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proto_tree_add_item_format(cdp_tree, hf_cdp_flags, offset, 1,
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pd[offset],
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"Flags: %x (unknown)", pd[offset]);
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offset += 1;
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proto_tree_add_item_format(cdp_tree, hf_cdp_ttl, offset, 2,
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pntohs(&pd[offset]),
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"TTL: %u (unknown)", pntohs(&pd[offset]));
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offset += 2;
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while( IS_DATA_IN_FRAME(offset) ){
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type = pntohs(&pd[offset + TLV_TYPE]);
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length = pntohs(&pd[offset + TLV_LENGTH]);
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type_str = val_to_str(type, type_vals,
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"Unknown (0x%04x)");
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switch( type ){
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case TYPE_MGMT_ADDR:
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/* ??? Mgmt Addr; in this one, the "length"
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field doesn't include the length of the
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type and length fields. */
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tlvi = proto_tree_add_text(cdp_tree, offset,
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length + 4, "Type: %s, length: %u",
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type_str, length);
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvlength,
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offset + TLV_LENGTH, 2, length);
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if (length > 0) {
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proto_tree_add_text(tlv_tree,
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offset + 4, length, "Data");
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}
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offset+=length + 4;
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break;
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case TYPE_CHASSIS_ID:
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/* ??? Chassis ID */
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tlvi = proto_tree_add_text(cdp_tree, offset,
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length, "Chassis ID: %s",
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&pd[offset+4]);
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvlength,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, offset + 4,
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length - 4, "Chassis ID: %s",
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&pd[offset+4]);
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offset+=length;
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break;
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case TYPE_2:
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/* this is quite strange: this tlv contains
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no data itself but two tlvs which
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calculate the length without the 2 byte
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type and 2 byte length field */
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tlvi = proto_tree_add_text(cdp_tree, offset,
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4, "Type: %u (unknown), second field: %u",
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type, length);
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_text(tlv_tree,
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offset + TLV_LENGTH, 2, "Second field: %u",
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length);
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offset+=4;
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break;
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case TYPE_PORT:
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/* ??? Port */
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tlvi = proto_tree_add_text(cdp_tree, offset,
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length, "Sent through Interface: %s",
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&pd[offset+4]);
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvlength,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, offset + 4,
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length - 4, "Sent through Interface: %s",
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&pd[offset+4]);
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offset+=length;
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break;
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case TYPE_IOS_VERSION:
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/* ??? IOS Version */
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add_multi_line_string_to_tree(cdp_tree,
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offset + 4, length - 4, "Software Version: ",
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&pd[offset+4] );
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offset+=length;
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break;
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case TYPE_PLATFORM:
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/* ??? platform */
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stringmem = malloc(length);
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memset(stringmem, '\0', length);
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memcpy(stringmem, &pd[offset+4], length - 4 );
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tlvi = proto_tree_add_text(cdp_tree,
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offset, length, "Platform: %s",
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stringmem);
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvlength,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, offset + 4,
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length - 4, "Platform: %s", stringmem);
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free(stringmem);
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offset+=length;
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break;
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case TYPE_MGMT_IP_ADDR:
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/* ??? Mgmt IP Addr; in this one, the "length"
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field doesn't include the length of the
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type and length fields. */
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tlvi = proto_tree_add_text(cdp_tree,
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offset, length + 4, "Mgmt IP: %s",
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ip_to_str(&pd[offset+4]));
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvlength,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, offset + 4,
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length, "IP address: %s",
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ip_to_str(&pd[offset+4]));
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offset+=length + 4;
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break;
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default:
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tlvi = proto_tree_add_text(cdp_tree, offset,
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length, "Type: %s, length: %u",
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type_str, length);
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tlv_tree = proto_item_add_subtree(tlvi,
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ett_cdp_tlv);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvtype,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_item(tlv_tree, hf_cdp_tlvlength,
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offset + TLV_LENGTH, 2, length);
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if (length > 4) {
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proto_tree_add_text(tlv_tree,
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offset + 4, length - 4, "Data");
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} else
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return;
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offset+=length;
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}
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}
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dissect_data(pd, offset, fd, cdp_tree);
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}
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}
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static void
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add_multi_line_string_to_tree(proto_tree *tree, gint start, gint len,
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const gchar *prefix, const gchar *string)
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{
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int prefix_len;
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int i;
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char blanks[64+1];
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const gchar *p, *q;
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int line_len;
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int data_len;
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prefix_len = strlen(prefix);
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if (prefix_len > 64)
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prefix_len = 64;
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for (i = 0; i < prefix_len; i++)
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blanks[i] = ' ';
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blanks[i] = '\0';
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p = string;
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for (;;) {
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q = strchr(p, '\n');
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if (q != NULL) {
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line_len = q - p;
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data_len = line_len + 1;
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} else {
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line_len = strlen(p);
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data_len = line_len;
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}
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proto_tree_add_text(tree, start, data_len, "%s%.*s", prefix,
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line_len, p);
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if (q == NULL)
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break;
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p += data_len;
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start += data_len;
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prefix = blanks;
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}
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}
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void
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proto_register_cdp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_cdp_version,
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{ "Version", "cdp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_cdp_flags,
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{ "Flags", "cdp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
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"" }},
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{ &hf_cdp_ttl,
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{ "TTL", "cdp.ttl", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_cdp_tlvtype,
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{ "Type", "cdp.tlv.type", FT_UINT16, BASE_HEX, VALS(type_vals), 0x0,
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"" }},
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{ &hf_cdp_tlvlength,
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{ "Length", "cdp.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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};
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static gint *ett[] = {
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&ett_cdp,
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&ett_cdp_tlv,
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};
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proto_cdp = proto_register_protocol("Cisco Discovery Protocol", "cdp");
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proto_register_field_array(proto_cdp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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