The Tcpdump Group git mirrors - tcpdump/blob - print-arcnet.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * From: NetBSD: print-arcnet.c,v 1.2 2000/04/24 13:02:28 itojun Exp
  22  */
  23 #ifndef lint
  24 static const char rcsid[] =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-arcnet.c,v 1.11 2002-12-18 08:53:19 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <stdio.h>
  35 #include <pcap.h>
  36
  37 #include "interface.h"
  38 #include "arcnet.h"
  39
  40 int arcnet_encap_print(u_char arctype, const u_char *p,
  41     u_int length, u_int caplen);
  42
  43 struct tok arctypemap[] = {
  44         { ARCTYPE_IP_OLD,       "oldip" },
  45         { ARCTYPE_ARP_OLD,      "oldarp" },
  46         { ARCTYPE_IP,           "ip" },
  47         { ARCTYPE_ARP,          "arp" },
  48         { ARCTYPE_REVARP,       "rarp" },
  49         { ARCTYPE_ATALK,        "atalk" },
  50         { ARCTYPE_BANIAN,       "banyan" },
  51         { ARCTYPE_IPX,          "ipx" },
  52         { ARCTYPE_INET6,        "ipv6" },
  53         { ARCTYPE_DIAGNOSE,     "diag" },
  54         { 0, 0 }
  55 };
  56
  57 static inline void
  58 arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
  59 {
  60         const struct arc_header *ap;
  61         const char *arctypename;
  62
  63
  64         ap = (const struct arc_header *)bp;
  65
  66
  67         if (qflag) {
  68                 (void)printf("%02x %02x %d: ",
  69                              ap->arc_shost,
  70                              ap->arc_dhost,
  71                              length);
  72                 return;
  73         }
  74
  75         arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
  76
  77         if (!phds) {
  78                 (void)printf("%02x %02x %s %d: ",
  79                              ap->arc_shost, ap->arc_dhost, arctypename,
  80                              length);
  81                              return;
  82         }
  83
  84         if (flag == 0) {
  85                 (void)printf("%02x %02x %s seqid %04x %d: ",
  86                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  87                         length);
  88                         return;
  89         }
  90
  91         if (flag & 1)
  92                 (void)printf("%02x %02x %s seqid %04x "
  93                         "(first of %d fragments) %d: ",
  94                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  95                         (flag + 3) / 2, length);
  96         else
  97                 (void)printf("%02x %02x %s seqid %04x "
  98                         "(fragment %d) %d: ",
  99                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 100                         flag/2 + 1, length);
 101 }
 102
 103 /*
 104  * This is the top level routine of the printer.  'p' points
 105  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 106  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
 107  * is the number of bytes actually captured.
 108  */
 109 void
 110 arcnet_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
 111 {
 112         u_int caplen = h->caplen;
 113         u_int length = h->len;
 114         const struct arc_header *ap;
 115
 116         int phds, flag = 0, archdrlen = 0;
 117         u_int seqid = 0;
 118         u_char arc_type;
 119
 120         ++infodelay;
 121         ts_print(&h->ts);
 122
 123         if (caplen < ARC_HDRLEN) {
 124                 printf("[|arcnet]");
 125                 goto out;
 126         }
 127
 128         ap = (const struct arc_header *)p;
 129         arc_type = ap->arc_type;
 130
 131         switch (arc_type) {
 132         default:
 133                 phds = 1;
 134                 break;
 135         case ARCTYPE_IP_OLD:
 136         case ARCTYPE_ARP_OLD:
 137         case ARCTYPE_DIAGNOSE:
 138                 phds = 0;
 139                 archdrlen = ARC_HDRLEN;
 140                 break;
 141         }
 142
 143         if (phds) {
 144                 if (caplen < ARC_HDRNEWLEN) {
 145                         arcnet_print(p, length, 0, 0, 0);
 146                         printf("[|phds]");
 147                         goto out;
 148                 }
 149
 150                 if (ap->arc_flag == 0xff) {
 151                         if (caplen < ARC_HDRNEWLEN_EXC) {
 152                                 arcnet_print(p, length, 0, 0, 0);
 153                                 printf("[|phds extended]");
 154                                 goto out;
 155                         }
 156                         flag = ap->arc_flag2;
 157                         seqid = ap->arc_seqid2;
 158                         archdrlen = ARC_HDRNEWLEN_EXC;
 159                 } else {
 160                         flag = ap->arc_flag;
 161                         seqid = ap->arc_seqid;
 162                         archdrlen = ARC_HDRNEWLEN;
 163                 }
 164         }
 165
 166
 167         if (eflag)
 168                 arcnet_print(p, length, phds, flag, seqid);
 169
 170         /*
 171          * Some printers want to check that they're not walking off the
 172          * end of the packet.
 173          * Rather than pass it all the way down, we set this global.
 174          */
 175         snapend = p + caplen;
 176
 177         length -= archdrlen;
 178         caplen -= archdrlen;
 179         p += archdrlen;
 180
 181         if (phds && flag && (flag & 1) == 0)
 182                 goto out2;
 183
 184         if (!arcnet_encap_print(arc_type, p, length, caplen)) {
 185                 default_print(p, caplen);
 186                 goto out;
 187         }
 188
 189  out2:
 190         if (xflag)
 191                 default_print(p, caplen);
 192
 193  out:
 194         putchar('\n');
 195         --infodelay;
 196         if (infoprint)
 197                 info(0);
 198 }
 199
 200 /*
 201  * Prints the packet encapsulated in an ARCnet data field,
 202  * given the ARCnet system code.
 203  *
 204  * Returns non-zero if it can do so, zero if the system code is unknown.
 205  */
 206
 207
 208 int
 209 arcnet_encap_print(u_char arctype, const u_char *p,
 210     u_int length, u_int caplen)
 211 {
 212         switch (arctype) {
 213
 214         case ARCTYPE_IP_OLD:
 215         case ARCTYPE_IP:
 216                 ip_print(p, length);
 217                 return (1);
 218
 219 #ifdef INET6
 220         case ARCTYPE_INET6:
 221                 ip6_print(p, length);
 222                 return (1);
 223 #endif /*INET6*/
 224
 225         case ARCTYPE_ARP_OLD:
 226         case ARCTYPE_ARP:
 227         case ARCTYPE_REVARP:
 228                 arp_print(p, length, caplen);
 229                 return (1);
 230
 231         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 232                 if (vflag)
 233                         fputs("et1 ", stdout);
 234                 atalk_print(p, length);
 235                 return (1);
 236
 237         default:
 238                 return (0);
 239         }
 240 }