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 1.13 2002-12-19 09:39:10 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 u_int
 110 arcnet_if_print(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         if (caplen < ARC_HDRLEN) {
 121                 printf("[|arcnet]");
 122                 return (caplen);
 123         }
 124
 125         ap = (const struct arc_header *)p;
 126         arc_type = ap->arc_type;
 127
 128         switch (arc_type) {
 129         default:
 130                 phds = 1;
 131                 break;
 132         case ARCTYPE_IP_OLD:
 133         case ARCTYPE_ARP_OLD:
 134         case ARCTYPE_DIAGNOSE:
 135                 phds = 0;
 136                 archdrlen = ARC_HDRLEN;
 137                 break;
 138         }
 139
 140         if (phds) {
 141                 if (caplen < ARC_HDRNEWLEN) {
 142                         arcnet_print(p, length, 0, 0, 0);
 143                         printf("[|phds]");
 144                         return (caplen);
 145                 }
 146
 147                 if (ap->arc_flag == 0xff) {
 148                         if (caplen < ARC_HDRNEWLEN_EXC) {
 149                                 arcnet_print(p, length, 0, 0, 0);
 150                                 printf("[|phds extended]");
 151                                 return (caplen);
 152                         }
 153                         flag = ap->arc_flag2;
 154                         seqid = ap->arc_seqid2;
 155                         archdrlen = ARC_HDRNEWLEN_EXC;
 156                 } else {
 157                         flag = ap->arc_flag;
 158                         seqid = ap->arc_seqid;
 159                         archdrlen = ARC_HDRNEWLEN;
 160                 }
 161         }
 162
 163
 164         if (eflag)
 165                 arcnet_print(p, length, phds, flag, seqid);
 166
 167         /*
 168          * Go past the ARCNET header.
 169          */
 170         length -= archdrlen;
 171         caplen -= archdrlen;
 172         p += archdrlen;
 173
 174         if (phds && flag && (flag & 1) == 0)
 175                 return (archdrlen);
 176
 177         if (!arcnet_encap_print(arc_type, p, length, caplen))
 178                 default_print(p, caplen);
 179
 180         return (archdrlen);
 181 }
 182
 183 /*
 184  * Prints the packet encapsulated in an ARCnet data field,
 185  * given the ARCnet system code.
 186  *
 187  * Returns non-zero if it can do so, zero if the system code is unknown.
 188  */
 189
 190
 191 static int
 192 arcnet_encap_print(u_char arctype, const u_char *p,
 193     u_int length, u_int caplen)
 194 {
 195         switch (arctype) {
 196
 197         case ARCTYPE_IP_OLD:
 198         case ARCTYPE_IP:
 199                 ip_print(p, length);
 200                 return (1);
 201
 202 #ifdef INET6
 203         case ARCTYPE_INET6:
 204                 ip6_print(p, length);
 205                 return (1);
 206 #endif /*INET6*/
 207
 208         case ARCTYPE_ARP_OLD:
 209         case ARCTYPE_ARP:
 210         case ARCTYPE_REVARP:
 211                 arp_print(p, length, caplen);
 212                 return (1);
 213
 214         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 215                 if (vflag)
 216                         fputs("et1 ", stdout);
 217                 atalk_print(p, length);
 218                 return (1);
 219
 220         default:
 221                 return (0);
 222         }
 223 }