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 1.12 2002-12-18 09:41:14 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 static 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 u_char *orig_p;
 115         u_int orig_caplen;
 116         const struct arc_header *ap;
 117
 118         int phds, flag = 0, archdrlen = 0;
 119         u_int seqid = 0;
 120         u_char arc_type;
 121
 122         ++infodelay;
 123         ts_print(&h->ts);
 124
 125         if (caplen < ARC_HDRLEN) {
 126                 printf("[|arcnet]");
 127                 goto out;
 128         }
 129
 130         ap = (const struct arc_header *)p;
 131         arc_type = ap->arc_type;
 132
 133         switch (arc_type) {
 134         default:
 135                 phds = 1;
 136                 break;
 137         case ARCTYPE_IP_OLD:
 138         case ARCTYPE_ARP_OLD:
 139         case ARCTYPE_DIAGNOSE:
 140                 phds = 0;
 141                 archdrlen = ARC_HDRLEN;
 142                 break;
 143         }
 144
 145         if (phds) {
 146                 if (caplen < ARC_HDRNEWLEN) {
 147                         arcnet_print(p, length, 0, 0, 0);
 148                         printf("[|phds]");
 149                         goto out;
 150                 }
 151
 152                 if (ap->arc_flag == 0xff) {
 153                         if (caplen < ARC_HDRNEWLEN_EXC) {
 154                                 arcnet_print(p, length, 0, 0, 0);
 155                                 printf("[|phds extended]");
 156                                 goto out;
 157                         }
 158                         flag = ap->arc_flag2;
 159                         seqid = ap->arc_seqid2;
 160                         archdrlen = ARC_HDRNEWLEN_EXC;
 161                 } else {
 162                         flag = ap->arc_flag;
 163                         seqid = ap->arc_seqid;
 164                         archdrlen = ARC_HDRNEWLEN;
 165                 }
 166         }
 167
 168
 169         if (eflag)
 170                 arcnet_print(p, length, phds, flag, seqid);
 171
 172         /*
 173          * Some printers want to check that they're not walking off the
 174          * end of the packet.
 175          * Rather than pass it all the way down, we set this global.
 176          */
 177         snapend = p + caplen;
 178
 179         /*
 180          * Save the information for the full packet, so we can print
 181          * everything if "-e" and "-x" are both specified.
 182          */
 183         orig_p = p;
 184         orig_caplen = caplen;
 185
 186         /*
 187          * Go past the ARCNET header.
 188          */
 189         length -= archdrlen;
 190         caplen -= archdrlen;
 191         p += archdrlen;
 192
 193         if (phds && flag && (flag & 1) == 0)
 194                 goto out2;
 195
 196         if (!arcnet_encap_print(arc_type, p, length, caplen)) {
 197                 default_print(p, caplen);
 198                 goto out;
 199         }
 200
 201  out2:
 202         if (xflag)
 203                 default_print_packet(orig_p, orig_caplen, archdrlen);
 204
 205  out:
 206         putchar('\n');
 207         --infodelay;
 208         if (infoprint)
 209                 info(0);
 210 }
 211
 212 /*
 213  * Prints the packet encapsulated in an ARCnet data field,
 214  * given the ARCnet system code.
 215  *
 216  * Returns non-zero if it can do so, zero if the system code is unknown.
 217  */
 218
 219
 220 static int
 221 arcnet_encap_print(u_char arctype, const u_char *p,
 222     u_int length, u_int caplen)
 223 {
 224         switch (arctype) {
 225
 226         case ARCTYPE_IP_OLD:
 227         case ARCTYPE_IP:
 228                 ip_print(p, length);
 229                 return (1);
 230
 231 #ifdef INET6
 232         case ARCTYPE_INET6:
 233                 ip6_print(p, length);
 234                 return (1);
 235 #endif /*INET6*/
 236
 237         case ARCTYPE_ARP_OLD:
 238         case ARCTYPE_ARP:
 239         case ARCTYPE_REVARP:
 240                 arp_print(p, length, caplen);
 241                 return (1);
 242
 243         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 244                 if (vflag)
 245                         fputs("et1 ", stdout);
 246                 atalk_print(p, length);
 247                 return (1);
 248
 249         default:
 250                 return (0);
 251         }
 252 }