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/*
* Copyright (c) 1990, 1991, 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.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.41 2005-11-04 18:30:21 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <pcap.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "ppp.h"
#include "chdlc.h"
static void chdlc_slarp_print(const u_char *, u_int);
const struct tok chdlc_cast_values[] = {
{ CHDLC_UNICAST, "unicast" },
{ CHDLC_BCAST, "bcast" },
{ 0, NULL}
};
/* Standard CHDLC printer */
u_int
chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
if (caplen < CHDLC_HDRLEN) {
printf("[|chdlc]");
return (caplen);
}
return (chdlc_print(p,length));
}
u_int
chdlc_print(register const u_char *p, u_int length) {
u_int proto;
const struct ip *ip;
proto = EXTRACT_16BITS(&p[2]);
if (eflag) {
printf("%s, ethertype %s (0x%04x), length %u: ",
tok2str(chdlc_cast_values, "0x%02x", p[0]),
tok2str(ethertype_values, "Unknown", proto),
proto,
length);
}
length -= CHDLC_HDRLEN;
ip = (const struct ip *)(p + CHDLC_HDRLEN);
switch (proto) {
case ETHERTYPE_IP:
ip_print(gndo, (const u_char *)ip, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
ip6_print((const u_char *)ip, length);
break;
#endif
case CHDLC_TYPE_SLARP:
chdlc_slarp_print((const u_char *)ip, length);
break;
#if 0
case CHDLC_TYPE_CDP:
chdlc_cdp_print((const u_char *)ip, length);
break;
#endif
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
mpls_print((const u_char *)(ip), length);
break;
case ETHERTYPE_ISO:
/* is the fudge byte set ? lets verify by spotting ISO headers */
if (*(p+CHDLC_HDRLEN+1) == 0x81 ||
*(p+CHDLC_HDRLEN+1) == 0x82 ||
*(p+CHDLC_HDRLEN+1) == 0x83)
isoclns_print(p+CHDLC_HDRLEN+1, length-1, length-1);
else
isoclns_print(p+CHDLC_HDRLEN, length, length);
break;
default:
printf("unknown CHDLC protocol (0x%04x)", proto);
break;
}
return (CHDLC_HDRLEN);
}
/*
* The fixed-length portion of a SLARP packet.
*/
struct cisco_slarp {
u_int8_t code[4];
#define SLARP_REQUEST 0
#define SLARP_REPLY 1
#define SLARP_KEEPALIVE 2
union {
struct {
u_int8_t addr[4];
u_int8_t mask[4];
} addr;
struct {
u_int8_t myseq[4];
u_int8_t yourseq[4];
u_int8_t rel[2];
} keep;
} un;
};
#define SLARP_MIN_LEN 14
#define SLARP_MAX_LEN 18
static void
chdlc_slarp_print(const u_char *cp, u_int length)
{
const struct cisco_slarp *slarp;
u_int sec,min,hrs,days;
printf("SLARP (length: %u), ",length);
if (length < SLARP_MIN_LEN)
goto trunc;
slarp = (const struct cisco_slarp *)cp;
TCHECK2(*slarp, SLARP_MIN_LEN);
switch (EXTRACT_32BITS(&slarp->code)) {
case SLARP_REQUEST:
printf("request");
/*
* At least according to William "Chops" Westfield's
* message in
*
* http://www.nethelp.no/net/cisco-hdlc.txt
*
* the address and mask aren't used in requests -
* they're just zero.
*/
break;
case SLARP_REPLY:
printf("reply %s/%s",
ipaddr_string(&slarp->un.addr.addr),
ipaddr_string(&slarp->un.addr.mask));
break;
case SLARP_KEEPALIVE:
printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
EXTRACT_32BITS(&slarp->un.keep.myseq),
EXTRACT_32BITS(&slarp->un.keep.yourseq),
EXTRACT_16BITS(&slarp->un.keep.rel));
if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
cp += SLARP_MIN_LEN;
if (!TTEST2(*cp, 4))
goto trunc;
sec = EXTRACT_32BITS(cp) / 1000;
min = sec / 60; sec -= min * 60;
hrs = min / 60; min -= hrs * 60;
days = hrs / 24; hrs -= days * 24;
printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec);
}
break;
default:
printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code));
if (vflag <= 1)
print_unknown_data(cp+4,"\n\t",length-4);
break;
}
if (SLARP_MAX_LEN < length && vflag)
printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN);
if (vflag > 1)
print_unknown_data(cp+4,"\n\t",length-4);
return;
trunc:
printf("[|slarp]");
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 8
* End:
*/
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