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print-arcnet.c

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 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.
 *
 * From: NetBSD: print-arcnet.c,v 1.2 2000/04/24 13:02:28 itojun Exp
 */
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-arcnet.c,v 1.15.2.2 2003/11/16 08:51:09 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <pcap.h>

#include "interface.h"
#include "arcnet.h"

static int arcnet_encap_print(u_char arctype, const u_char *p,
    u_int length, u_int caplen);

struct tok arctypemap[] = {
      { ARCTYPE_IP_OLD, "oldip" },
      { ARCTYPE_ARP_OLD,      "oldarp" },
      { ARCTYPE_IP,           "ip" },
      { ARCTYPE_ARP,          "arp" },
      { ARCTYPE_REVARP, "rarp" },
      { ARCTYPE_ATALK,  "atalk" },
      { ARCTYPE_BANIAN, "banyan" },
      { ARCTYPE_IPX,          "ipx" },
      { ARCTYPE_INET6,  "ipv6" },
      { ARCTYPE_DIAGNOSE,     "diag" },
      { 0, 0 }
};

static inline void
arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
{
      const struct arc_header *ap;
      const char *arctypename;


      ap = (const struct arc_header *)bp;


      if (qflag) {
            (void)printf("%02x %02x %d: ",
                       ap->arc_shost,
                       ap->arc_dhost,
                       length);
            return;
      }

      arctypename = tok2str(arctypemap, "%02x", ap->arc_type);

      if (!phds) {
            (void)printf("%02x %02x %s %d: ",
                       ap->arc_shost, ap->arc_dhost, arctypename,
                       length);
                       return;
      }

      if (flag == 0) {
            (void)printf("%02x %02x %s seqid %04x %d: ",
                  ap->arc_shost, ap->arc_dhost, arctypename, seqid,
                  length);
                  return;
      }

      if (flag & 1)
            (void)printf("%02x %02x %s seqid %04x "
                  "(first of %d fragments) %d: ",
                  ap->arc_shost, ap->arc_dhost, arctypename, seqid,
                  (flag + 3) / 2, length);
      else
            (void)printf("%02x %02x %s seqid %04x "
                  "(fragment %d) %d: ",
                  ap->arc_shost, ap->arc_dhost, arctypename, seqid,
                  flag/2 + 1, length);
}

/*
 * This is the top level routine of the printer.  'p' points
 * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
 * is the number of bytes actually captured.
 */
u_int
arcnet_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
      u_int caplen = h->caplen;
      u_int length = h->len;
      const struct arc_header *ap;

      int phds, flag = 0, archdrlen = 0;
      u_int seqid = 0;
      u_char arc_type;

      if (caplen < ARC_HDRLEN) {
            printf("[|arcnet]");
            return (caplen);
      }

      ap = (const struct arc_header *)p;
      arc_type = ap->arc_type;

      switch (arc_type) {
      default:
            phds = 1;
            break;
      case ARCTYPE_IP_OLD:
      case ARCTYPE_ARP_OLD:
      case ARCTYPE_DIAGNOSE:
            phds = 0;
            archdrlen = ARC_HDRLEN;
            break;
      }

      if (phds) {
            if (caplen < ARC_HDRNEWLEN) {
                  arcnet_print(p, length, 0, 0, 0);
                  printf("[|phds]");
                  return (caplen);
            }

            if (ap->arc_flag == 0xff) {
                  if (caplen < ARC_HDRNEWLEN_EXC) {
                        arcnet_print(p, length, 0, 0, 0);
                        printf("[|phds extended]");
                        return (caplen);
                  }
                  flag = ap->arc_flag2;
                  seqid = ntohs(ap->arc_seqid2);
                  archdrlen = ARC_HDRNEWLEN_EXC;
            } else {
                  flag = ap->arc_flag;
                  seqid = ntohs(ap->arc_seqid);
                  archdrlen = ARC_HDRNEWLEN;
            }
      }


      if (eflag)
            arcnet_print(p, length, phds, flag, seqid);

      /*
       * Go past the ARCNET header.
       */
      length -= archdrlen;
      caplen -= archdrlen;
      p += archdrlen;

      if (phds && flag && (flag & 1) == 0) {
            /*
             * This is a middle fragment.
             */
            return (archdrlen);
      }

      if (!arcnet_encap_print(arc_type, p, length, caplen))
            default_print(p, caplen);

      return (archdrlen);
}

/*
 * This is the top level routine of the printer.  'p' points
 * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 * 'h->length' is the length of the packet off the wire, and 'h->caplen'
 * is the number of bytes actually captured.  It is quite similar
 * to the non-Linux style printer except that Linux doesn't ever
 * supply packets that look like exception frames, it always supplies
 * reassembled packets rather than raw frames, and headers have an
 * extra "offset" field between the src/dest and packet type.
 */
u_int
arcnet_linux_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
      u_int caplen = h->caplen;
      u_int length = h->len;
      const struct arc_linux_header *ap;

      int archdrlen = 0;
      u_char arc_type;

      if (caplen < ARC_LINUX_HDRLEN) {
            printf("[|arcnet]");
            return (caplen);
      }

      ap = (const struct arc_linux_header *)p;
      arc_type = ap->arc_type;

      switch (arc_type) {
      default:
            archdrlen = ARC_LINUX_HDRNEWLEN;
            if (caplen < ARC_LINUX_HDRNEWLEN) {
                  printf("[|arcnet]");
                  return (caplen);
            }
            break;
      case ARCTYPE_IP_OLD:
      case ARCTYPE_ARP_OLD:
      case ARCTYPE_DIAGNOSE:
            archdrlen = ARC_LINUX_HDRLEN;
            break;
      }

      if (eflag)
            arcnet_print(p, length, 0, 0, 0);

      /*
       * Go past the ARCNET header.
       */
      length -= archdrlen;
      caplen -= archdrlen;
      p += archdrlen;

      if (!arcnet_encap_print(arc_type, p, length, caplen))
            default_print(p, caplen);

      return (archdrlen);
}

/*
 * Prints the packet encapsulated in an ARCnet data field,
 * given the ARCnet system code.
 *
 * Returns non-zero if it can do so, zero if the system code is unknown.
 */


static int
arcnet_encap_print(u_char arctype, const u_char *p,
    u_int length, u_int caplen)
{
      switch (arctype) {

      case ARCTYPE_IP_OLD:
      case ARCTYPE_IP:
            ip_print(p, length);
            return (1);

#ifdef INET6
      case ARCTYPE_INET6:
            ip6_print(p, length);
            return (1);
#endif /*INET6*/

      case ARCTYPE_ARP_OLD:
      case ARCTYPE_ARP:
      case ARCTYPE_REVARP:
            arp_print(p, length, caplen);
            return (1);

      case ARCTYPE_ATALK:     /* XXX was this ever used? */
            if (vflag)
                  fputs("et1 ", stdout);
            atalk_print(p, length);
            return (1);

      case ARCTYPE_IPX:
            ipx_print(p, length);
            return (1);

      default:
            return (0);
      }
}

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