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
  24 /* \summary: Attached Resource Computer NETwork (ARCNET) printer */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include "netdissect-stdinc.h"
  31
  32 #include "netdissect.h"
  33 #include "extract.h"
  34
  35 /*
  36  * from: NetBSD: if_arc.h,v 1.13 1999/11/19 20:41:19 thorpej Exp
  37  */
  38
  39 /*
  40  * Structure of a 2.5MB/s Arcnet header on the BSDs,
  41  * as given to interface code.
  42  */
  43 struct  arc_header {
  44         nd_uint8_t  arc_shost;
  45         nd_uint8_t  arc_dhost;
  46         nd_uint8_t  arc_type;
  47         /*
  48          * only present for newstyle encoding with LL fragmentation.
  49          * Don't use sizeof(anything), use ARC_HDR{,NEW}LEN instead.
  50          */
  51         nd_uint8_t  arc_flag;
  52         nd_uint16_t arc_seqid;
  53
  54         /*
  55          * only present in exception packets (arc_flag == 0xff)
  56          */
  57         nd_uint8_t  arc_type2;  /* same as arc_type */
  58         nd_uint8_t  arc_flag2;  /* real flag value */
  59         nd_uint16_t arc_seqid2; /* real seqid value */
  60 };
  61
  62 #define ARC_HDRLEN              3
  63 #define ARC_HDRNEWLEN           6
  64 #define ARC_HDRNEWLEN_EXC       10
  65
  66 /* RFC 1051 */
  67 #define ARCTYPE_IP_OLD          240     /* IP protocol */
  68 #define ARCTYPE_ARP_OLD         241     /* address resolution protocol */
  69
  70 /* RFC 1201 */
  71 #define ARCTYPE_IP              212     /* IP protocol */
  72 #define ARCTYPE_ARP             213     /* address resolution protocol */
  73 #define ARCTYPE_REVARP          214     /* reverse addr resolution protocol */
  74
  75 #define ARCTYPE_ATALK           221     /* Appletalk */
  76 #define ARCTYPE_BANIAN          247     /* Banyan Vines */
  77 #define ARCTYPE_IPX             250     /* Novell IPX */
  78
  79 #define ARCTYPE_INET6           0xc4    /* IPng */
  80 #define ARCTYPE_DIAGNOSE        0x80    /* as per ANSI/ATA 878.1 */
  81
  82 /*
  83  * Structure of a 2.5MB/s Arcnet header on Linux.  Linux has
  84  * an extra "offset" field when given to interface code, and
  85  * never presents packets that look like exception frames.
  86  */
  87 struct  arc_linux_header {
  88         nd_uint8_t  arc_shost;
  89         nd_uint8_t  arc_dhost;
  90         nd_uint16_t arc_offset;
  91         nd_uint8_t  arc_type;
  92         /*
  93          * only present for newstyle encoding with LL fragmentation.
  94          * Don't use sizeof(anything), use ARC_LINUX_HDR{,NEW}LEN
  95          * instead.
  96          */
  97         nd_uint8_t  arc_flag;
  98         nd_uint16_t arc_seqid;
  99 };
 100
 101 #define ARC_LINUX_HDRLEN        5
 102 #define ARC_LINUX_HDRNEWLEN     8
 103
 104 static int arcnet_encap_print(netdissect_options *, u_char arctype, const u_char *p,
 105     u_int length, u_int caplen);
 106
 107 static const struct tok arctypemap[] = {
 108         { ARCTYPE_IP_OLD,       "oldip" },
 109         { ARCTYPE_ARP_OLD,      "oldarp" },
 110         { ARCTYPE_IP,           "ip" },
 111         { ARCTYPE_ARP,          "arp" },
 112         { ARCTYPE_REVARP,       "rarp" },
 113         { ARCTYPE_ATALK,        "atalk" },
 114         { ARCTYPE_BANIAN,       "banyan" },
 115         { ARCTYPE_IPX,          "ipx" },
 116         { ARCTYPE_INET6,        "ipv6" },
 117         { ARCTYPE_DIAGNOSE,     "diag" },
 118         { 0, 0 }
 119 };
 120
 121 static void
 122 arcnet_print(netdissect_options *ndo, const u_char *bp, u_int length, int phds,
 123              u_int flag, u_int seqid)
 124 {
 125         const struct arc_header *ap;
 126         const char *arctypename;
 127
 128         ndo->ndo_protocol = "arcnet";
 129         ap = (const struct arc_header *)bp;
 130
 131         if (ndo->ndo_qflag) {
 132                 ND_PRINT("%02x %02x %u: ",
 133                              EXTRACT_U_1(ap->arc_shost),
 134                              EXTRACT_U_1(ap->arc_dhost),
 135                              length);
 136                 return;
 137         }
 138
 139         arctypename = tok2str(arctypemap, "%02x", EXTRACT_U_1(ap->arc_type));
 140
 141         if (!phds) {
 142                 ND_PRINT("%02x %02x %s %u: ",
 143                              EXTRACT_U_1(ap->arc_shost),
 144                              EXTRACT_U_1(ap->arc_dhost),
 145                              arctypename,
 146                              length);
 147                 return;
 148         }
 149
 150         if (flag == 0) {
 151                 ND_PRINT("%02x %02x %s seqid %04x %u: ",
 152                         EXTRACT_U_1(ap->arc_shost),
 153                         EXTRACT_U_1(ap->arc_dhost),
 154                         arctypename, seqid,
 155                         length);
 156                 return;
 157         }
 158
 159         if (flag & 1)
 160                 ND_PRINT("%02x %02x %s seqid %04x "
 161                         "(first of %u fragments) %u: ",
 162                         EXTRACT_U_1(ap->arc_shost),
 163                         EXTRACT_U_1(ap->arc_dhost),
 164                         arctypename, seqid,
 165                         (flag + 3) / 2, length);
 166         else
 167                 ND_PRINT("%02x %02x %s seqid %04x "
 168                         "(fragment %u) %u: ",
 169                         EXTRACT_U_1(ap->arc_shost),
 170                         EXTRACT_U_1(ap->arc_dhost),
 171                         arctypename, seqid,
 172                         flag/2 + 1, length);
 173 }
 174
 175 /*
 176  * This is the top level routine of the printer.  'p' points
 177  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 178  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 179  * is the number of bytes actually captured.
 180  */
 181 u_int
 182 arcnet_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 183 {
 184         u_int caplen = h->caplen;
 185         u_int length = h->len;
 186         const struct arc_header *ap;
 187
 188         int phds;
 189         u_int flag = 0, archdrlen = 0;
 190         u_int seqid = 0;
 191         u_char arc_type;
 192
 193         ndo->ndo_protocol = "arcnet_if";
 194         if (caplen < ARC_HDRLEN || length < ARC_HDRLEN) {
 195                 ND_PRINT("[|arcnet]");
 196                 return (caplen);
 197         }
 198
 199         ap = (const struct arc_header *)p;
 200         arc_type = EXTRACT_U_1(ap->arc_type);
 201
 202         switch (arc_type) {
 203         default:
 204                 phds = 1;
 205                 break;
 206         case ARCTYPE_IP_OLD:
 207         case ARCTYPE_ARP_OLD:
 208         case ARCTYPE_DIAGNOSE:
 209                 phds = 0;
 210                 archdrlen = ARC_HDRLEN;
 211                 break;
 212         }
 213
 214         if (phds) {
 215                 if (caplen < ARC_HDRNEWLEN || length < ARC_HDRNEWLEN) {
 216                         arcnet_print(ndo, p, length, 0, 0, 0);
 217                         ND_PRINT("[|phds]");
 218                         return (caplen);
 219                 }
 220
 221                 flag = EXTRACT_U_1(ap->arc_flag);
 222                 if (flag == 0xff) {
 223                         if (caplen < ARC_HDRNEWLEN_EXC || length < ARC_HDRNEWLEN_EXC) {
 224                                 arcnet_print(ndo, p, length, 0, 0, 0);
 225                                 ND_PRINT("[|phds extended]");
 226                                 return (caplen);
 227                         }
 228                         flag = EXTRACT_U_1(ap->arc_flag2);
 229                         seqid = EXTRACT_BE_U_2(ap->arc_seqid2);
 230                         archdrlen = ARC_HDRNEWLEN_EXC;
 231                 } else {
 232                         seqid = EXTRACT_BE_U_2(ap->arc_seqid);
 233                         archdrlen = ARC_HDRNEWLEN;
 234                 }
 235         }
 236
 237
 238         if (ndo->ndo_eflag)
 239                 arcnet_print(ndo, p, length, phds, flag, seqid);
 240
 241         /*
 242          * Go past the ARCNET header.
 243          */
 244         length -= archdrlen;
 245         caplen -= archdrlen;
 246         p += archdrlen;
 247
 248         if (phds && flag && (flag & 1) == 0) {
 249                 /*
 250                  * This is a middle fragment.
 251                  */
 252                 return (archdrlen);
 253         }
 254
 255         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 256                 ND_DEFAULTPRINT(p, caplen);
 257
 258         return (archdrlen);
 259 }
 260
 261 /*
 262  * This is the top level routine of the printer.  'p' points
 263  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 264  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 265  * is the number of bytes actually captured.  It is quite similar
 266  * to the non-Linux style printer except that Linux doesn't ever
 267  * supply packets that look like exception frames, it always supplies
 268  * reassembled packets rather than raw frames, and headers have an
 269  * extra "offset" field between the src/dest and packet type.
 270  */
 271 u_int
 272 arcnet_linux_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 273 {
 274         u_int caplen = h->caplen;
 275         u_int length = h->len;
 276         const struct arc_linux_header *ap;
 277
 278         int archdrlen = 0;
 279         u_char arc_type;
 280
 281         ndo->ndo_protocol = "arcnet_linux_if";
 282         if (caplen < ARC_LINUX_HDRLEN || length < ARC_LINUX_HDRLEN) {
 283                 ND_PRINT("[|arcnet]");
 284                 return (caplen);
 285         }
 286
 287         ap = (const struct arc_linux_header *)p;
 288         arc_type = EXTRACT_U_1(ap->arc_type);
 289
 290         switch (arc_type) {
 291         default:
 292                 archdrlen = ARC_LINUX_HDRNEWLEN;
 293                 if (caplen < ARC_LINUX_HDRNEWLEN || length < ARC_LINUX_HDRNEWLEN) {
 294                         ND_PRINT("[|arcnet]");
 295                         return (caplen);
 296                 }
 297                 break;
 298         case ARCTYPE_IP_OLD:
 299         case ARCTYPE_ARP_OLD:
 300         case ARCTYPE_DIAGNOSE:
 301                 archdrlen = ARC_LINUX_HDRLEN;
 302                 break;
 303         }
 304
 305         if (ndo->ndo_eflag)
 306                 arcnet_print(ndo, p, length, 0, 0, 0);
 307
 308         /*
 309          * Go past the ARCNET header.
 310          */
 311         length -= archdrlen;
 312         caplen -= archdrlen;
 313         p += archdrlen;
 314
 315         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 316                 ND_DEFAULTPRINT(p, caplen);
 317
 318         return (archdrlen);
 319 }
 320
 321 /*
 322  * Prints the packet encapsulated in an ARCnet data field,
 323  * given the ARCnet system code.
 324  *
 325  * Returns non-zero if it can do so, zero if the system code is unknown.
 326  */
 327
 328
 329 static int
 330 arcnet_encap_print(netdissect_options *ndo, u_char arctype, const u_char *p,
 331     u_int length, u_int caplen)
 332 {
 333         switch (arctype) {
 334
 335         case ARCTYPE_IP_OLD:
 336         case ARCTYPE_IP:
 337                 ip_print(ndo, p, length);
 338                 return (1);
 339
 340         case ARCTYPE_INET6:
 341                 ip6_print(ndo, p, length);
 342                 return (1);
 343
 344         case ARCTYPE_ARP_OLD:
 345         case ARCTYPE_ARP:
 346         case ARCTYPE_REVARP:
 347                 arp_print(ndo, p, length, caplen);
 348                 return (1);
 349
 350         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 351                 if (ndo->ndo_vflag)
 352                         ND_PRINT("et1 ");
 353                 atalk_print(ndo, p, length);
 354                 return (1);
 355
 356         case ARCTYPE_IPX:
 357                 ipx_print(ndo, p, length);
 358                 return (1);
 359
 360         default:
 361                 return (0);
 362         }
 363 }
 364
 365 /*
 366  * Local Variables:
 367  * c-style: bsd
 368  * End:
 369  */
 370