contrib/tcpdump/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[] _U_ =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-arcnet.c,v 1.20 2005-04-06 21:32:38 mcr 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 "extract.h"
  39 #include "arcnet.h"
  40
  41 static int arcnet_encap_print(u_char arctype, const u_char *p,
  42     u_int length, u_int caplen);
  43
  44 struct tok arctypemap[] = {
  45         { ARCTYPE_IP_OLD,       "oldip" },
  46         { ARCTYPE_ARP_OLD,      "oldarp" },
  47         { ARCTYPE_IP,           "ip" },
  48         { ARCTYPE_ARP,          "arp" },
  49         { ARCTYPE_REVARP,       "rarp" },
  50         { ARCTYPE_ATALK,        "atalk" },
  51         { ARCTYPE_BANIAN,       "banyan" },
  52         { ARCTYPE_IPX,          "ipx" },
  53         { ARCTYPE_INET6,        "ipv6" },
  54         { ARCTYPE_DIAGNOSE,     "diag" },
  55         { 0, 0 }
  56 };
  57
  58 static inline void
  59 arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
  60 {
  61         const struct arc_header *ap;
  62         const char *arctypename;
  63
  64
  65         ap = (const struct arc_header *)bp;
  66
  67
  68         if (qflag) {
  69                 (void)printf("%02x %02x %d: ",
  70                              ap->arc_shost,
  71                              ap->arc_dhost,
  72                              length);
  73                 return;
  74         }
  75
  76         arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
  77
  78         if (!phds) {
  79                 (void)printf("%02x %02x %s %d: ",
  80                              ap->arc_shost, ap->arc_dhost, arctypename,
  81                              length);
  82                              return;
  83         }
  84
  85         if (flag == 0) {
  86                 (void)printf("%02x %02x %s seqid %04x %d: ",
  87                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  88                         length);
  89                         return;
  90         }
  91
  92         if (flag & 1)
  93                 (void)printf("%02x %02x %s seqid %04x "
  94                         "(first of %d fragments) %d: ",
  95                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  96                         (flag + 3) / 2, length);
  97         else
  98                 (void)printf("%02x %02x %s seqid %04x "
  99                         "(fragment %d) %d: ",
 100                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 101                         flag/2 + 1, length);
 102 }
 103
 104 /*
 105  * This is the top level routine of the printer.  'p' points
 106  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 107  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 108  * is the number of bytes actually captured.
 109  */
 110 u_int
 111 arcnet_if_print(const struct pcap_pkthdr *h, const u_char *p)
 112 {
 113         u_int caplen = h->caplen;
 114         u_int length = h->len;
 115         const struct arc_header *ap;
 116
 117         int phds, flag = 0, archdrlen = 0;
 118         u_int seqid = 0;
 119         u_char arc_type;
 120
 121         if (caplen < ARC_HDRLEN) {
 122                 printf("[|arcnet]");
 123                 return (caplen);
 124         }
 125
 126         ap = (const struct arc_header *)p;
 127         arc_type = ap->arc_type;
 128
 129         switch (arc_type) {
 130         default:
 131                 phds = 1;
 132                 break;
 133         case ARCTYPE_IP_OLD:
 134         case ARCTYPE_ARP_OLD:
 135         case ARCTYPE_DIAGNOSE:
 136                 phds = 0;
 137                 archdrlen = ARC_HDRLEN;
 138                 break;
 139         }
 140
 141         if (phds) {
 142                 if (caplen < ARC_HDRNEWLEN) {
 143                         arcnet_print(p, length, 0, 0, 0);
 144                         printf("[|phds]");
 145                         return (caplen);
 146                 }
 147
 148                 if (ap->arc_flag == 0xff) {
 149                         if (caplen < ARC_HDRNEWLEN_EXC) {
 150                                 arcnet_print(p, length, 0, 0, 0);
 151                                 printf("[|phds extended]");
 152                                 return (caplen);
 153                         }
 154                         flag = ap->arc_flag2;
 155                         seqid = EXTRACT_16BITS(&ap->arc_seqid2);
 156                         archdrlen = ARC_HDRNEWLEN_EXC;
 157                 } else {
 158                         flag = ap->arc_flag;
 159                         seqid = EXTRACT_16BITS(&ap->arc_seqid);
 160                         archdrlen = ARC_HDRNEWLEN;
 161                 }
 162         }
 163
 164
 165         if (eflag)
 166                 arcnet_print(p, length, phds, flag, seqid);
 167
 168         /*
 169          * Go past the ARCNET header.
 170          */
 171         length -= archdrlen;
 172         caplen -= archdrlen;
 173         p += archdrlen;
 174
 175         if (phds && flag && (flag & 1) == 0) {
 176                 /*
 177                  * This is a middle fragment.
 178                  */
 179                 return (archdrlen);
 180         }
 181
 182         if (!arcnet_encap_print(arc_type, p, length, caplen))
 183                 default_print(p, caplen);
 184
 185         return (archdrlen);
 186 }
 187
 188 /*
 189  * This is the top level routine of the printer.  'p' points
 190  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 191  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 192  * is the number of bytes actually captured.  It is quite similar
 193  * to the non-Linux style printer except that Linux doesn't ever
 194  * supply packets that look like exception frames, it always supplies
 195  * reassembled packets rather than raw frames, and headers have an
 196  * extra "offset" field between the src/dest and packet type.
 197  */
 198 u_int
 199 arcnet_linux_if_print(const struct pcap_pkthdr *h, const u_char *p)
 200 {
 201         u_int caplen = h->caplen;
 202         u_int length = h->len;
 203         const struct arc_linux_header *ap;
 204
 205         int archdrlen = 0;
 206         u_char arc_type;
 207
 208         if (caplen < ARC_LINUX_HDRLEN) {
 209                 printf("[|arcnet]");
 210                 return (caplen);
 211         }
 212
 213         ap = (const struct arc_linux_header *)p;
 214         arc_type = ap->arc_type;
 215
 216         switch (arc_type) {
 217         default:
 218                 archdrlen = ARC_LINUX_HDRNEWLEN;
 219                 if (caplen < ARC_LINUX_HDRNEWLEN) {
 220                         printf("[|arcnet]");
 221                         return (caplen);
 222                 }
 223                 break;
 224         case ARCTYPE_IP_OLD:
 225         case ARCTYPE_ARP_OLD:
 226         case ARCTYPE_DIAGNOSE:
 227                 archdrlen = ARC_LINUX_HDRLEN;
 228                 break;
 229         }
 230
 231         if (eflag)
 232                 arcnet_print(p, length, 0, 0, 0);
 233
 234         /*
 235          * Go past the ARCNET header.
 236          */
 237         length -= archdrlen;
 238         caplen -= archdrlen;
 239         p += archdrlen;
 240
 241         if (!arcnet_encap_print(arc_type, p, length, caplen))
 242                 default_print(p, caplen);
 243
 244         return (archdrlen);
 245 }
 246
 247 /*
 248  * Prints the packet encapsulated in an ARCnet data field,
 249  * given the ARCnet system code.
 250  *
 251  * Returns non-zero if it can do so, zero if the system code is unknown.
 252  */
 253
 254
 255 static int
 256 arcnet_encap_print(u_char arctype, const u_char *p,
 257     u_int length, u_int caplen)
 258 {
 259         switch (arctype) {
 260
 261         case ARCTYPE_IP_OLD:
 262         case ARCTYPE_IP:
 263                 ip_print(gndo, p, length);
 264                 return (1);
 265
 266 #ifdef INET6
 267         case ARCTYPE_INET6:
 268                 ip6_print(gndo, p, length);
 269                 return (1);
 270 #endif /*INET6*/
 271
 272         case ARCTYPE_ARP_OLD:
 273         case ARCTYPE_ARP:
 274         case ARCTYPE_REVARP:
 275                 arp_print(gndo, p, length, caplen);
 276                 return (1);
 277
 278         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 279                 if (vflag)
 280                         fputs("et1 ", stdout);
 281                 atalk_print(p, length);
 282                 return (1);
 283
 284         case ARCTYPE_IPX:
 285                 ipx_print(p, length);
 286                 return (1);
 287
 288         default:
 289                 return (0);
 290         }
 291 }
 292
 293 /*
 294  * Local Variables:
 295  * c-style: bsd
 296  * End:
 297  */
 298