/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Code by Gert Doering, SpaceNet GmbH, gert@space.net
*
* Reference documentation:
* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.25 2004/10/07 14:53:11 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
#include "nlpid.h"
#define CDP_HEADER_LEN 4
static struct tok cdp_tlv_values[] = {
{ 0x01, "Device-ID"},
{ 0x02, "Address"},
{ 0x03, "Port-ID"},
{ 0x04, "Capability"},
{ 0x05, "Version String"},
{ 0x06, "Platform"},
{ 0x07, "Prefixes"},
{ 0x08, "Protocol-Hello option"},
{ 0x09, "VTP Management Domain"},
{ 0x0a, "Native VLAN ID"},
{ 0x0b, "Duplex"},
{ 0x0e, "ATA-186 VoIP VLAN request"},
{ 0x0f, "ATA-186 VoIP VLAN assignment"},
{ 0x10, "power consumption"},
{ 0x11, "MTU"},
{ 0x12, "AVVID trust bitmap"},
{ 0x13, "AVVID untrusted ports CoS"},
{ 0x14, "System Name"},
{ 0x15, "System Object ID (not decoded)"},
{ 0x16, "Management Addresses"},
{ 0x17, "Physical Location"},
{ 0, NULL}
};
static struct tok cdp_capability_values[] = {
{ 0x01, "Router" },
{ 0x02, "Transparent Bridge" },
{ 0x04, "Source Route Bridge" },
{ 0x08, "L2 Switch" },
{ 0x10, "L3 capable" },
{ 0x20, "IGMP snooping" },
{ 0x40, "L1 capable" },
{ 0, NULL }
};
static int cdp_print_addr(const u_char *, int);
static int cdp_print_prefixes(const u_char *, int);
static unsigned long cdp_get_number(const u_char *, int);
void
cdp_print(const u_char *pptr, u_int length, u_int caplen)
{
int type, len, i, j;
const u_char *tptr;
if (caplen < CDP_HEADER_LEN) {
(void)printf("[|cdp]");
return;
}
tptr = pptr; /* temporary pointer */
if (!TTEST2(*tptr, CDP_HEADER_LEN))
goto trunc;
printf("CDPv%u, ttl: %us", *tptr, *(tptr+1));
if (vflag)
printf(", checksum: %u (unverified), length %u", EXTRACT_16BITS(tptr), length);
tptr += CDP_HEADER_LEN;
while (tptr < (pptr+length)) {
if (!TTEST2(*tptr, 4)) /* read out Type and Length */
goto trunc;
type = EXTRACT_16BITS(tptr);
len = EXTRACT_16BITS(tptr+2); /* object length includes the 4 bytes header length */
tptr += 4;
len -= 4;
if (!TTEST2(*tptr, len))
goto trunc;
if (vflag || type == 1) { /* in non-verbose mode just print Device-ID */
if (vflag)
printf("\n\t%s (0x%02x), length: %u byte%s: ",
tok2str(cdp_tlv_values,"unknown field type", type),
type,
len,
len>1 ? "s" : ""); /* plural */
switch (type) {
case 0x01: /* Device-ID */
if (!vflag)
printf(", Device-ID '%.*s'", len, tptr);
else
printf("'%.*s'", len, tptr);
break;
case 0x02: /* Address */
if (cdp_print_addr(tptr, len) < 0)
goto trunc;
break;
case 0x03: /* Port-ID */
printf("'%.*s'", len, tptr);
break;
case 0x04: /* Capabilities */
printf("(0x%08x): %s",
EXTRACT_32BITS(tptr),
bittok2str(cdp_capability_values, "none",EXTRACT_32BITS(tptr)));
break;
case 0x05: /* Version */
printf("\n\t ");
for (i=0;i<len;i++) {
j = *(tptr+i);
putchar(j);
if (j == 0x0a) /* lets rework the version string to get a nice identation */
printf("\t ");
}
break;
case 0x06: /* Platform */
printf("'%.*s'", len, tptr);
break;
case 0x07: /* Prefixes */
if (cdp_print_prefixes(tptr, len) < 0)
goto trunc;
break;
case 0x08: /* Protocol Hello Option - not documented */
break;
case 0x09: /* VTP Mgmt Domain - not documented */
printf("'%.*s'", len,tptr);
break;
case 0x0a: /* Native VLAN ID - not documented */
printf("%d",EXTRACT_16BITS(tptr));
break;
case 0x0b: /* Duplex - not documented */
printf("%s", *(tptr) ? "full": "half");
break;
/* http://www.cisco.com/univercd/cc/td/doc/product/voice/ata/atarn/186rn21m.htm
* plus more details from other sources
*/
case 0x0e: /* ATA-186 VoIP VLAN request - incomplete doc. */
printf("app %d, vlan %d",
*(tptr), EXTRACT_16BITS(tptr+1));
break;
case 0x10: /* ATA-186 VoIP VLAN assignment - incomplete doc. */
printf("%1.2fW",
cdp_get_number(tptr, len)/1000.0 );
break;
case 0x11: /* MTU - not documented */
printf("%u bytes", EXTRACT_32BITS(tptr));
break;
case 0x12: /* AVVID trust bitmap - not documented */
printf("0x%02x", *(tptr) );
break;
case 0x13: /* AVVID untrusted port CoS - not documented */
printf("0x%02x", *(tptr));
break;
case 0x14: /* System Name - not documented */
printf("'%.*s'", len, tptr);
break;
case 0x16: /* System Object ID - not documented */
if (cdp_print_addr(tptr, len) < 0)
goto trunc;
break;
case 0x17: /* Physical Location - not documented */
printf("0x%02x/%.*s", *(tptr), len - 1, tptr + 1 );
break;
default:
print_unknown_data(tptr,"\n\t ",len);
break;
}
}
/* avoid infinite loop */
if (len == 0)
break;
tptr = tptr+len;
}
if (vflag < 1)
printf(", length %u",caplen);
return;
trunc:
printf("[|cdp]");
}
/*
* Protocol type values.
*
* PT_NLPID means that the protocol type field contains an OSI NLPID.
*
* PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2
* LLC header that specifies that the payload is for that protocol.
*/
#define PT_NLPID 1 /* OSI NLPID */
#define PT_IEEE_802_2 2 /* IEEE 802.2 LLC header */
static int
cdp_print_addr(const u_char * p, int l)
{
int pt, pl, al, num;
const u_char *endp = p + l;
#ifdef INET6
static u_char prot_ipv6[] = {
0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd
};
#endif
TCHECK2(*p, 2);
num = EXTRACT_32BITS(p);
p += 4;
while (p < endp && num >= 0) {
TCHECK2(*p, 2);
if (p + 2 > endp)
goto trunc;
pt = p[0]; /* type of "protocol" field */
pl = p[1]; /* length of "protocol" field */
p += 2;
TCHECK2(p[pl], 2);
if (p + pl + 2 > endp)
goto trunc;
al = EXTRACT_16BITS(&p[pl]); /* address length */
if (pt == PT_NLPID && pl == 1 && *p == NLPID_IP && al == 4) {
/*
* IPv4: protocol type = NLPID, protocol length = 1
* (1-byte NLPID), protocol = 0xcc (NLPID for IPv4),
* address length = 4
*/
p += 3;
TCHECK2(*p, 4);
if (p + 4 > endp)
goto trunc;
printf("IPv4 (%u) %s",
num,
ipaddr_string(p));
p += 4;
}
#ifdef INET6
else if (pt == PT_IEEE_802_2 && pl == 8 &&
memcmp(p, prot_ipv6, 8) == 0 && al == 16) {
/*
* IPv6: protocol type = IEEE 802.2 header,
* protocol length = 8 (size of LLC+SNAP header),
* protocol = LLC+SNAP header with the IPv6
* Ethertype, address length = 16
*/
p += 10;
TCHECK2(*p, al);
if (p + al > endp)
goto trunc;
printf("IPv6 (%u) %s",
num,
ip6addr_string(p));
p += al;
}
#endif
else {
/*
* Generic case: just print raw data
*/
TCHECK2(*p, pl);
if (p + pl > endp)
goto trunc;
printf("pt=0x%02x, pl=%d, pb=", *(p - 2), pl);
while (pl-- > 0)
printf(" %02x", *p++);
TCHECK2(*p, 2);
if (p + 2 > endp)
goto trunc;
al = (*p << 8) + *(p + 1);
printf(", al=%d, a=", al);
p += 2;
TCHECK2(*p, al);
if (p + al > endp)
goto trunc;
while (al-- > 0)
printf(" %02x", *p++);
}
num--;
if (num)
printf(" ");
}
return 0;
trunc:
return -1;
}
static int
cdp_print_prefixes(const u_char * p, int l)
{
if (l % 5)
goto trunc;
printf(" IPv4 Prefixes (%d):", l / 5);
while (l > 0) {
printf(" %u.%u.%u.%u/%u", p[0], p[1], p[2], p[3], p[4]);
l -= 5;
p += 5;
}
return 0;
trunc:
return -1;
}
/* read in a <n>-byte number, MSB first
* (of course this can handle max sizeof(long))
*/
static unsigned long cdp_get_number(const u_char * p, int l)
{
unsigned long res=0;
while( l>0 )
{
res = (res<<8) + *p;
p++; l--;
}
return res;
}