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 1.6 2001-09-17 21:57:54 fenner Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <sys/param.h>
  33 #include <sys/time.h>
  34 #include <sys/socket.h>
  35
  36 struct mbuf;
  37 struct rtentry;
  38
  39 #include <netinet/in.h>
  40
  41 #include <stdio.h>
  42 #include <pcap.h>
  43
  44 #include "interface.h"
  45 #include "arcnet.h"
  46
  47 int arcnet_encap_print(u_char arctype, const u_char *p,
  48     u_int length, u_int caplen);
  49
  50 struct tok arctypemap[] = {
  51         { ARCTYPE_IP_OLD,       "oldip" },
  52         { ARCTYPE_ARP_OLD,      "oldarp" },
  53         { ARCTYPE_IP,           "ip" },
  54         { ARCTYPE_ARP,          "arp" },
  55         { ARCTYPE_REVARP,       "rarp" },
  56         { ARCTYPE_ATALK,        "atalk" },
  57         { ARCTYPE_BANIAN,       "banyan" },
  58         { ARCTYPE_IPX,          "ipx" },
  59         { ARCTYPE_INET6,        "ipv6" },
  60         { ARCTYPE_DIAGNOSE,     "diag" },
  61         { 0, 0 }
  62 };
  63
  64 static inline void
  65 arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
  66 {
  67         const struct arc_header *ap;
  68         const char *arctypename;
  69
  70
  71         ap = (const struct arc_header *)bp;
  72
  73
  74         if (qflag) {
  75                 (void)printf("%02x %02x %d: ",
  76                              ap->arc_shost,
  77                              ap->arc_dhost,
  78                              length);
  79                 return;
  80         }
  81
  82         arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
  83
  84         if (!phds) {
  85                 (void)printf("%02x %02x %s %d: ",
  86                              ap->arc_shost, ap->arc_dhost, arctypename,
  87                              length);
  88                              return;
  89         }
  90
  91         if (flag == 0) {
  92                 (void)printf("%02x %02x %s seqid %04x %d: ",
  93                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  94                         length);
  95                         return;
  96         }
  97
  98         if (flag & 1)
  99                 (void)printf("%02x %02x %s seqid %04x "
 100                         "(first of %d fragments) %d: ",
 101                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 102                         (flag + 3) / 2, length);
 103         else
 104                 (void)printf("%02x %02x %s seqid %04x "
 105                         "(fragment %d) %d: ",
 106                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 107                         flag/2 + 1, length);
 108 }
 109
 110 /*
 111  * This is the top level routine of the printer.  'p' is the points
 112  * to the ether header of the packet, 'tvp' is the timestamp,
 113  * 'length' is the length of the packet off the wire, and 'caplen'
 114  * is the number of bytes actually captured.
 115  */
 116 void
 117 arcnet_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 118 {
 119         u_int caplen = h->caplen;
 120         u_int length = h->len;
 121         const struct arc_header *ap;
 122
 123         int phds, flag = 0, archdrlen = 0;
 124         u_int seqid = 0;
 125         u_char arc_type;
 126
 127         ++infodelay;
 128         ts_print(&h->ts);
 129
 130         if (caplen < ARC_HDRLEN) {
 131                 printf("[|arcnet]");
 132                 goto out;
 133         }
 134
 135         ap = (const struct arc_header *)p;
 136         arc_type = ap->arc_type;
 137
 138         switch (arc_type) {
 139         default:
 140                 phds = 1;
 141                 break;
 142         case ARCTYPE_IP_OLD:
 143         case ARCTYPE_ARP_OLD:
 144         case ARCTYPE_DIAGNOSE:
 145                 phds = 0;
 146                 archdrlen = ARC_HDRLEN;
 147                 break;
 148         }
 149
 150         if (phds) {
 151                 if (caplen < ARC_HDRNEWLEN) {
 152                         arcnet_print(p, length, 0, 0, 0);
 153                         printf("[|phds]");
 154                         goto out;
 155                 }
 156
 157                 if (ap->arc_flag == 0xff) {
 158                         if (caplen < ARC_HDRNEWLEN_EXC) {
 159                                 arcnet_print(p, length, 0, 0, 0);
 160                                 printf("[|phds extended]");
 161                                 goto out;
 162                         }
 163                         flag = ap->arc_flag2;
 164                         seqid = ap->arc_seqid2;
 165                         archdrlen = ARC_HDRNEWLEN_EXC;
 166                 } else {
 167                         flag = ap->arc_flag;
 168                         seqid = ap->arc_seqid;
 169                         archdrlen = ARC_HDRNEWLEN;
 170                 }
 171         }
 172
 173
 174         if (eflag)
 175                 arcnet_print(p, length, phds, flag, seqid);
 176
 177         /*
 178          * Some printers want to get back at the ethernet addresses,
 179          * and/or check that they're not walking off the end of the packet.
 180          * Rather than pass them all the way down, we set these globals.
 181          */
 182         packetp = p;
 183         snapend = p + caplen;
 184
 185         length -= archdrlen;
 186         caplen -= archdrlen;
 187         p += archdrlen;
 188
 189         if (phds && flag && (flag & 1) == 0)
 190                 goto out2;
 191
 192         if (!arcnet_encap_print(arc_type, p, length, caplen)) {
 193                 default_print(p, caplen);
 194                 goto out;
 195         }
 196
 197  out2:
 198         if (xflag)
 199                 default_print(p, caplen);
 200
 201  out:
 202         putchar('\n');
 203         --infodelay;
 204         if (infoprint)
 205                 info(0);
 206 }
 207
 208 /*
 209  * Prints the packet encapsulated in an ARCnet data field,
 210  * given the ARCnet system code.
 211  *
 212  * Returns non-zero if it can do so, zero if the system code is unknown.
 213  */
 214
 215
 216 int
 217 arcnet_encap_print(u_char arctype, const u_char *p,
 218     u_int length, u_int caplen)
 219 {
 220         switch (arctype) {
 221
 222         case ARCTYPE_IP_OLD:
 223         case ARCTYPE_IP:
 224                 ip_print(p, length);
 225                 return (1);
 226
 227 #ifdef INET6
 228         case ARCTYPE_INET6:
 229                 ip6_print(p, length);
 230                 return (1);
 231 #endif /*INET6*/
 232
 233         case ARCTYPE_ARP_OLD:
 234         case ARCTYPE_ARP:
 235         case ARCTYPE_REVARP:
 236                 arp_print(p, length, caplen);
 237                 return (1);
 238
 239         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 240                 if (vflag)
 241                         fputs("et1 ", stdout);
 242                 atalk_print(p, length);
 243                 return (1);
 244
 245         default:
 246                 return (0);
 247         }
 248 }