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/* packet-cdp.c
* Routines for the disassembly of the "Cisco Discovery Protocol"
* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
*
* $Id: packet-cdp.c,v 1.9 1999/07/07 22:51:41 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "packet.h"
/* Offsets in TLV structure. */
#define TLV_TYPE 0
#define TLV_LENGTH 2
static void
add_multi_line_string_to_tree(proto_tree *tree, gint start, gint len,
const gchar *prefix, const gchar *string);
void
dissect_cdp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *cdp_tree = NULL;
proto_item *ti;
typedef struct _e_cdp_hdr{
char version;
char flags;
gint16 ttl;
} e_cdp_hdr;
e_cdp_hdr *cdp_hdr;
char *stringmem;
gint16 type;
gint16 length;
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "CDP");
if (check_col(fd, COL_INFO))
col_add_str(fd, COL_INFO, "Cisco Discovery Protocol");
if(tree){
ti = proto_tree_add_text(tree, offset, (fd->cap_len - offset),
"Cisco Discovery Protocol");
cdp_tree = proto_item_add_subtree(ti, ETT_CDP);
/* CDP header */
cdp_hdr = (e_cdp_hdr *) &pd[offset];
proto_tree_add_text(cdp_tree, offset, 1, "Version: %d", cdp_hdr->version);
proto_tree_add_text(cdp_tree, offset+1, 1, "Flags (unknown)");
proto_tree_add_text(cdp_tree, offset+2, 2, "TTL (unknown)");
offset+=4;
/* CVS -> exit here
dissect_data(pd, offset, fd, cdp_tree);
return;
*/
while( offset <= fd->cap_len ){
type = pntohs(&pd[offset + TLV_TYPE]);
length = pntohs(&pd[offset + TLV_LENGTH]);
switch( type ){
case 0: /* ??? Mgmt Addr */
offset+=length + 4;
break;
case 1: /* ??? Chassis ID */
proto_tree_add_text(cdp_tree, offset + 4,
length - 4, "Chassis ID: %s", &pd[offset+4] );
offset+=length;
break;
case 2:
/* this is quite strange: this tlv contains no data itself but two tlvs which
* calculate the length without the 2 byte type and 2 byte length field
*/
offset+=4;
break;
case 3: /* ??? Port */
proto_tree_add_text(cdp_tree, offset + 4,
length - 4, "Sent through Interface: %s", &pd[offset+4] );
offset+=length;
break;
case 5: /* ??? IOS Version */
add_multi_line_string_to_tree(cdp_tree,
offset + 4, length - 4, "Software Version: ",
&pd[offset+4] );
offset+=length;
break;
case 6: /* ??? platform */
stringmem = malloc(length);
memset(stringmem, '\0', length);
memcpy(stringmem, &pd[offset+4], length - 4 );
proto_tree_add_text(cdp_tree, offset + 4, length - 4,
"Platform: %s", stringmem );
free(stringmem);
offset+=length;
break;
case 0x01cc: /* ??? Mgmt Addr */
proto_tree_add_text(cdp_tree, offset + 4, length,
"Mgmt IP: %s",
ip_to_str(&pd[offset+4]) );
offset+=length + 4;
break;
default:
/*
if( type > 512){
dissect_data(pd, offset, fd, cdp_tree);
return;
}
*/
/*
proto_tree_add_text(cdp_tree, offset + TLV_TYPE,
2, "Type: %d", type);
proto_tree_add_text(cdp_tree, offset + TLV_LENGTH,
2, "Length: %d", length);
proto_tree_add_text(cdp_tree, offset + 4,
length - 4, "Data");
*/
offset+=length;
}
}
dissect_data(pd, offset, fd, cdp_tree);
}
}
static void
add_multi_line_string_to_tree(proto_tree *tree, gint start, gint len,
const gchar *prefix, const gchar *string)
{
int prefix_len;
int i;
char blanks[64+1];
const gchar *p, *q;
int line_len;
int data_len;
prefix_len = strlen(prefix);
if (prefix_len > 64)
prefix_len = 64;
for (i = 0; i < prefix_len; i++)
blanks[i] = ' ';
blanks[i] = '\0';
p = string;
for (;;) {
q = strchr(p, '\n');
if (q != NULL) {
line_len = q - p;
data_len = line_len + 1;
} else {
line_len = strlen(p);
data_len = line_len;
}
proto_tree_add_text(tree, start, data_len, "%s%.*s", prefix,
line_len, p);
if (q == NULL)
break;
p += data_len;
start += data_len;
prefix = blanks;
}
}
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