324 lines
7.7 KiB
C
324 lines
7.7 KiB
C
/* $NetBSD: print-cdp.c,v 1.4 2002/05/31 09:45:45 itojun Exp $ */
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/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Code by Gert Doering, SpaceNet GmbH, gert@space.net
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*
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* Reference documentation:
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* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char rcsid[] =
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"@(#) Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.13 2002/04/26 09:51:34 guy Exp";
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#else
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__RCSID("$NetBSD: print-cdp.c,v 1.4 2002/05/31 09:45:45 itojun Exp $");
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#endif
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#endif
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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 <sys/param.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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static int cdp_print_addr(const u_char *, int);
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static int cdp_print_prefixes(const u_char *, int);
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static unsigned long cdp_get_number(const u_char *, int);
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void
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cdp_print(const u_char *p, u_int length, u_int caplen,
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const u_char *esrc, const u_char *edst)
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{
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u_int i;
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int type, len;
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/* Cisco Discovery Protocol */
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if (caplen < 4) {
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(void)printf("[|cdp]");
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return;
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}
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i = 0; /* CDP data starts at offset 0 */
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printf("CDP v%u, ttl=%us", p[i], p[i + 1]);
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i += 4; /* skip version, TTL and chksum */
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while (i < length) {
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if (i + 4 > caplen)
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goto trunc;
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type = (p[i] << 8) + p[i + 1];
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len = (p[i + 2] << 8) + p[i + 3];
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if (vflag > 1)
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printf("\n\t");
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if (vflag)
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printf(" %02x/%02x", type, len);
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if (i + len > caplen)
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goto trunc;
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switch (type) {
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case 0x00:
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printf(" Goodbye");
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break;
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case 0x01:
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printf(" DevID '%.*s'", len - 4, p + i + 4);
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break;
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case 0x02:
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printf(" Addr");
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if (cdp_print_addr(p + i + 4, len - 4) < 0)
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goto trunc;
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break;
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case 0x03:
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printf(" PortID '%.*s'", len - 4, p + i + 4);
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break;
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case 0x04:
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printf(" CAP 0x%02x", (unsigned) p[i + 7]);
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break;
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case 0x05:
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if (vflag > 1)
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printf(" Version:\n%.*s", len - 4, p + i + 4);
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else
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printf(" Version: (suppressed)");
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break;
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case 0x06:
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printf(" Platform: '%.*s'", len - 4, p + i + 4);
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break;
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case 0x07:
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if (cdp_print_prefixes(p + i + 4, len - 4) < 0)
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goto trunc;
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break;
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case 0x08: /* guess - not documented */
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printf(" Protocol-Hello option" );
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break;
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case 0x09: /* guess - not documented */
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printf(" VTP Management Domain: '%.*s'", len - 4,
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p + i + 4);
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break;
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case 0x0a: /* guess - not documented */
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printf(" Native VLAN ID: %d",
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(p[i + 4] << 8) + p[i + 4 + 1] );
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break;
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case 0x0b: /* guess - not documented */
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printf(" Duplex: %s", p[i + 4] ? "full": "half");
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break;
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/* http://www.cisco.com/univercd/cc/td/doc/product/voice/ata/atarn/186rn21m.htm
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* plus more details from other sources
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*/
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case 0x0e: /* incomplete doc. */
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printf(" ATA-186 VoIP VLAN request, app %d, vlan %d",
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p[i + 4], EXTRACT_16BITS(&p[i+4+1]));
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break;
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case 0x0f: /* incomplete doc. */
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printf(" ATA-186 VoIP VLAN assignment" );
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break;
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case 0x10: /* incomplete doc. */
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printf(" power consumption: %1.2fW",
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cdp_get_number(p+i+4, len-4)/1000.0 );
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break;
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case 0x11: /* guess - not documented */
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printf(" MTU %u bytes", EXTRACT_32BITS(&p[i+4]));
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break;
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case 0x12: /* guess - not documented */
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printf(" AVVID trust bitmap 0x%02x", p[i+4] );
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break;
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case 0x13: /* guess - not documented */
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printf(" AVVID untrusted ports CoS: 0x%02x", p[i+4]);
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break;
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case 0x14: /* guess - not documented */
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printf(" sysName='%.*s'", len - 4, p + i + 4 );
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break;
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case 0x15: /* guess - not documented */
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printf(" sysObjectID" ); /* TODO */
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break;
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case 0x16: /* guess - not documented */
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printf(" management address(es)" );
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break;
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case 0x17: /* guess - not documented */
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printf(" phys. location 0x%02x/%.*s",
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p[i+4], len - 5, p + i + 5 );
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break;
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default:
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printf(" unknown field type %02x, len %d", type, len);
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break;
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}
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/* avoid infinite loop */
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if (len == 0)
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break;
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i += len;
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}
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return;
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trunc:
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printf("[|cdp]");
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}
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/*
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* Protocol type values.
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*
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* PT_NLPID means that the protocol type field contains an OSI NLPID.
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*
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* PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2
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* LLC header that specifies that the payload is for that protocol.
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*/
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#define PT_NLPID 1 /* OSI NLPID */
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#define PT_IEEE_802_2 2 /* IEEE 802.2 LLC header */
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static int
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cdp_print_addr(const u_char * p, int l)
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{
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int pt, pl, al, num;
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const u_char *endp = p + l;
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#ifdef INET6
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static u_char prot_ipv6[] = {
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0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd
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};
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#endif
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num = EXTRACT_32BITS(p);
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p += 4;
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printf(" (%d): ", num);
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while (p < endp && num >= 0) {
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if (p + 2 > endp)
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goto trunc;
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pt = p[0]; /* type of "protocol" field */
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pl = p[1]; /* length of "protocol" field */
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p += 2;
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if (p + pl + 2 > endp)
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goto trunc;
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al = EXTRACT_16BITS(&p[pl]); /* address length */
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if (pt == PT_NLPID && pl == 1 && *p == 0xcc && al == 4) {
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/*
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* IPv4: protocol type = NLPID, protocol length = 1
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* (1-byte NLPID), protocol = 0xcc (NLPID for IPv4),
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* address length = 4
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*/
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p += 3;
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if (p + 4 > endp)
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goto trunc;
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printf("IPv4 %u.%u.%u.%u", p[0], p[1], p[2], p[3]);
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p += 4;
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}
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#ifdef INET6
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else if (pt == PT_IEEE_802_2 && pl == 8 &&
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memcmp(p, prot_ipv6, 8) == 0 && al == 16) {
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/*
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* IPv6: protocol type = IEEE 802.2 header,
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* protocol length = 8 (size of LLC+SNAP header),
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* protocol = LLC+SNAP header with the IPv6
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* Ethertype, address length = 16
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*/
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p += 10;
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if (p + al > endp)
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goto trunc;
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printf("IPv6 %s", ip6addr_string(p));
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p += al;
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}
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#endif
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else {
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/*
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* Generic case: just print raw data
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*/
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if (p + pl > endp)
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goto trunc;
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printf("pt=0x%02x, pl=%d, pb=", *(p - 2), pl);
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while (pl-- > 0)
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printf(" %02x", *p++);
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if (p + 2 > endp)
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goto trunc;
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al = (*p << 8) + *(p + 1);
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printf(", al=%d, a=", al);
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p += 2;
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if (p + al > endp)
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goto trunc;
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while (al-- > 0)
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printf(" %02x", *p++);
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}
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num--;
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if (num)
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printf(" ");
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}
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return 0;
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trunc:
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return -1;
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}
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static int
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cdp_print_prefixes(const u_char * p, int l)
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{
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if (l % 5)
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goto trunc;
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printf(" IPv4 Prefixes (%d):", l / 5);
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while (l > 0) {
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printf(" %u.%u.%u.%u/%u", p[0], p[1], p[2], p[3], p[4]);
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l -= 5;
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p += 5;
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}
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return 0;
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trunc:
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return -1;
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}
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/* read in a <n>-byte number, MSB first
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* (of course this can handle max sizeof(long))
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*/
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static unsigned long cdp_get_number(const u_char * p, int l)
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{
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unsigned long res=0;
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while( l>0 )
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{
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res = (res<<8) + *p;
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p++; l--;
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}
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return res;
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}
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