1996-08-19 20:34:12 +00:00
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/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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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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1997-05-27 02:11:31 +00:00
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*
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1996-08-19 20:34:12 +00:00
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* Original code by Matt Thomas, Digital Equipment Corporation
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*/
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#ifndef lint
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1997-05-27 02:11:31 +00:00
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static const char rcsid[] =
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2000-01-30 00:45:58 +00:00
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"@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.16 1999/11/21 09:36:55 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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1996-08-19 20:34:12 +00:00
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#endif
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <stdio.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#define CLNS 129
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#define ESIS 130
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#define ISIS 131
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#define NULLNS 0
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static int osi_cksum(const u_char *, u_int, const u_char *, u_char *, u_char *);
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static void esis_print(const u_char *, u_int);
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void
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isoclns_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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if (caplen < 1) {
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printf("[|iso-clns] ");
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if (!eflag)
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printf("%s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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return;
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}
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switch (*p) {
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case CLNS:
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/* esis_print(&p, &length); */
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printf("iso-clns");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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break;
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case ESIS:
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printf("iso-esis");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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esis_print(p, length);
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return;
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case ISIS:
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printf("iso-isis");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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/* isis_print(&p, &length); */
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(void)printf(" len=%d ", length);
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if (caplen > 1)
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default_print_unaligned(p, caplen);
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break;
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case NULLNS:
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printf("iso-nullns");
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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break;
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default:
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printf("iso-clns %02x", p[0]);
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if (!eflag)
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(void)printf(" %s > %s",
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etheraddr_string(esrc),
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etheraddr_string(edst));
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(void)printf(" len=%d ", length);
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if (caplen > 1)
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default_print_unaligned(p, caplen);
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break;
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}
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}
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#define ESIS_REDIRECT 6
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#define ESIS_ESH 2
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#define ESIS_ISH 4
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struct esis_hdr {
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u_char version;
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u_char reserved;
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u_char type;
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u_char tmo[2];
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u_char cksum[2];
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};
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static void
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esis_print(const u_char *p, u_int length)
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{
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const u_char *ep;
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int li = p[1];
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const struct esis_hdr *eh = (const struct esis_hdr *) &p[2];
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u_char cksum[2];
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u_char off[2];
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if (length == 2) {
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if (qflag)
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printf(" bad pkt!");
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else
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printf(" no header at all!");
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return;
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}
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ep = p + li;
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if (li > length) {
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if (qflag)
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printf(" bad pkt!");
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else
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printf(" LI(%d) > PDU size (%d)!", li, length);
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return;
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}
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if (li < sizeof(struct esis_hdr) + 2) {
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if (qflag)
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printf(" bad pkt!");
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else {
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printf(" too short for esis header %d:", li);
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1998-09-15 19:36:32 +00:00
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while (--length != 0)
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1996-08-19 20:34:12 +00:00
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printf("%02X", *p++);
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}
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return;
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}
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switch (eh->type & 0x1f) {
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case ESIS_REDIRECT:
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printf(" redirect");
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break;
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case ESIS_ESH:
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printf(" esh");
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break;
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case ESIS_ISH:
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printf(" ish");
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break;
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default:
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printf(" type %d", eh->type & 0x1f);
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break;
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}
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off[0] = eh->cksum[0];
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off[1] = eh->cksum[1];
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if (vflag && osi_cksum(p, li, eh->cksum, cksum, off)) {
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printf(" bad cksum (got %02x%02x want %02x%02x)",
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eh->cksum[1], eh->cksum[0], cksum[1], cksum[0]);
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return;
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}
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if (eh->version != 1) {
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printf(" unsupported version %d", eh->version);
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return;
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}
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p += sizeof(*eh) + 2;
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li -= sizeof(*eh) + 2; /* protoid * li */
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switch (eh->type & 0x1f) {
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case ESIS_REDIRECT: {
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const u_char *dst, *snpa, *is;
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dst = p; p += *p + 1;
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if (p > snapend)
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return;
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printf(" %s", isonsap_string(dst));
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snpa = p; p += *p + 1;
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is = p; p += *p + 1;
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if (p > snapend)
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return;
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if (p > ep) {
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printf(" [bad li]");
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return;
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}
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if (is[0] == 0)
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printf(" > %s", etheraddr_string(&snpa[1]));
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else
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printf(" > %s", isonsap_string(is));
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li = ep - p;
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break;
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}
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#if 0
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case ESIS_ESH:
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printf(" esh");
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break;
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#endif
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case ESIS_ISH: {
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const u_char *is;
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is = p; p += *p + 1;
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if (p > ep) {
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printf(" [bad li]");
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return;
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}
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if (p > snapend)
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return;
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printf(" %s", isonsap_string(is));
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li = ep - p;
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break;
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}
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default:
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(void)printf(" len=%d", length);
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if (length && p < snapend) {
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length = snapend - p;
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default_print(p, length);
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}
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return;
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}
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if (vflag)
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while (p < ep && li) {
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int op, opli;
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const u_char *q;
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if (snapend - p < 2)
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return;
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if (li < 2) {
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printf(" bad opts/li");
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return;
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}
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op = *p++;
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opli = *p++;
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li -= 2;
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if (opli > li) {
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printf(" opt (%d) too long", op);
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return;
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}
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li -= opli;
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q = p;
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p += opli;
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if (snapend < p)
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return;
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if (op == 198 && opli == 2) {
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printf(" tmo=%d", q[0] * 256 + q[1]);
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continue;
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}
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printf (" %d:<", op);
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while (--opli >= 0)
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printf("%02x", *q++);
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printf (">");
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}
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}
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static int
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osi_cksum(register const u_char *p, register u_int len,
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const u_char *toff, u_char *cksum, u_char *off)
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{
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int x, y, f = (len - ((toff - p) + 1));
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int32_t c0 = 0, c1 = 0;
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if ((cksum[0] = off[0]) == 0 && (cksum[1] = off[1]) == 0)
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return 0;
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off[0] = off[1] = 0;
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1998-09-15 19:36:32 +00:00
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while ((int)--len >= 0) {
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1996-08-19 20:34:12 +00:00
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c0 += *p++;
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c1 += c0;
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c0 %= 255;
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c1 %= 255;
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}
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x = (c0 * f - c1);
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if (x < 0)
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x = 255 - (-x % 255);
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else
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x %= 255;
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y = -1 * (x + c0);
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if (y < 0)
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y = 255 - (-y % 255);
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else
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y %= 255;
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off[0] = x;
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off[1] = y;
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return (off[0] != cksum[0] || off[1] != cksum[1]);
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}
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