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 1.8 2002-06-11 17:08:41 itojun 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 #include <netinet/in.h>
  37
  38 #include <stdio.h>
  39 #include <pcap.h>
  40
  41 #include "interface.h"
  42 #include "arcnet.h"
  43
  44 int arcnet_encap_print(u_char arctype, const u_char *p,
  45     u_int length, u_int caplen);
  46
  47 struct tok arctypemap[] = {
  48         { ARCTYPE_IP_OLD,       "oldip" },
  49         { ARCTYPE_ARP_OLD,      "oldarp" },
  50         { ARCTYPE_IP,           "ip" },
  51         { ARCTYPE_ARP,          "arp" },
  52         { ARCTYPE_REVARP,       "rarp" },
  53         { ARCTYPE_ATALK,        "atalk" },
  54         { ARCTYPE_BANIAN,       "banyan" },
  55         { ARCTYPE_IPX,          "ipx" },
  56         { ARCTYPE_INET6,        "ipv6" },
  57         { ARCTYPE_DIAGNOSE,     "diag" },
  58         { 0, 0 }
  59 };
  60
  61 static inline void
  62 arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
  63 {
  64         const struct arc_header *ap;
  65         const char *arctypename;
  66
  67
  68         ap = (const struct arc_header *)bp;
  69
  70
  71         if (qflag) {
  72                 (void)printf("%02x %02x %d: ",
  73                              ap->arc_shost,
  74                              ap->arc_dhost,
  75                              length);
  76                 return;
  77         }
  78
  79         arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
  80
  81         if (!phds) {
  82                 (void)printf("%02x %02x %s %d: ",
  83                              ap->arc_shost, ap->arc_dhost, arctypename,
  84                              length);
  85                              return;
  86         }
  87
  88         if (flag == 0) {
  89                 (void)printf("%02x %02x %s seqid %04x %d: ",
  90                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  91                         length);
  92                         return;
  93         }
  94
  95         if (flag & 1)
  96                 (void)printf("%02x %02x %s seqid %04x "
  97                         "(first of %d fragments) %d: ",
  98                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
  99                         (flag + 3) / 2, length);
 100         else
 101                 (void)printf("%02x %02x %s seqid %04x "
 102                         "(fragment %d) %d: ",
 103                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 104                         flag/2 + 1, length);
 105 }
 106
 107 /*
 108  * This is the top level routine of the printer.  'p' is the points
 109  * to the ether header of the packet, 'tvp' is the timestamp,
 110  * 'length' is the length of the packet off the wire, and 'caplen'
 111  * is the number of bytes actually captured.
 112  */
 113 void
 114 arcnet_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 115 {
 116         u_int caplen = h->caplen;
 117         u_int length = h->len;
 118         const struct arc_header *ap;
 119
 120         int phds, flag = 0, archdrlen = 0;
 121         u_int seqid = 0;
 122         u_char arc_type;
 123
 124         ++infodelay;
 125         ts_print(&h->ts);
 126
 127         if (caplen < ARC_HDRLEN) {
 128                 printf("[|arcnet]");
 129                 goto out;
 130         }
 131
 132         ap = (const struct arc_header *)p;
 133         arc_type = ap->arc_type;
 134
 135         switch (arc_type) {
 136         default:
 137                 phds = 1;
 138                 break;
 139         case ARCTYPE_IP_OLD:
 140         case ARCTYPE_ARP_OLD:
 141         case ARCTYPE_DIAGNOSE:
 142                 phds = 0;
 143                 archdrlen = ARC_HDRLEN;
 144                 break;
 145         }
 146
 147         if (phds) {
 148                 if (caplen < ARC_HDRNEWLEN) {
 149                         arcnet_print(p, length, 0, 0, 0);
 150                         printf("[|phds]");
 151                         goto out;
 152                 }
 153
 154                 if (ap->arc_flag == 0xff) {
 155                         if (caplen < ARC_HDRNEWLEN_EXC) {
 156                                 arcnet_print(p, length, 0, 0, 0);
 157                                 printf("[|phds extended]");
 158                                 goto out;
 159                         }
 160                         flag = ap->arc_flag2;
 161                         seqid = ap->arc_seqid2;
 162                         archdrlen = ARC_HDRNEWLEN_EXC;
 163                 } else {
 164                         flag = ap->arc_flag;
 165                         seqid = ap->arc_seqid;
 166                         archdrlen = ARC_HDRNEWLEN;
 167                 }
 168         }
 169
 170
 171         if (eflag)
 172                 arcnet_print(p, length, phds, flag, seqid);
 173
 174         /*
 175          * Some printers want to get back at the ethernet addresses,
 176          * and/or check that they're not walking off the end of the packet.
 177          * Rather than pass them all the way down, we set these globals.
 178          */
 179         packetp = p;
 180         snapend = p + caplen;
 181
 182         length -= archdrlen;
 183         caplen -= archdrlen;
 184         p += archdrlen;
 185
 186         if (phds && flag && (flag & 1) == 0)
 187                 goto out2;
 188
 189         if (!arcnet_encap_print(arc_type, p, length, caplen)) {
 190                 default_print(p, caplen);
 191                 goto out;
 192         }
 193
 194  out2:
 195         if (xflag)
 196                 default_print(p, caplen);
 197
 198  out:
 199         putchar('\n');
 200         --infodelay;
 201         if (infoprint)
 202                 info(0);
 203 }
 204
 205 /*
 206  * Prints the packet encapsulated in an ARCnet data field,
 207  * given the ARCnet system code.
 208  *
 209  * Returns non-zero if it can do so, zero if the system code is unknown.
 210  */
 211
 212
 213 int
 214 arcnet_encap_print(u_char arctype, const u_char *p,
 215     u_int length, u_int caplen)
 216 {
 217         switch (arctype) {
 218
 219         case ARCTYPE_IP_OLD:
 220         case ARCTYPE_IP:
 221                 ip_print(p, length);
 222                 return (1);
 223
 224 #ifdef INET6
 225         case ARCTYPE_INET6:
 226                 ip6_print(p, length);
 227                 return (1);
 228 #endif /*INET6*/
 229
 230         case ARCTYPE_ARP_OLD:
 231         case ARCTYPE_ARP:
 232         case ARCTYPE_REVARP:
 233                 arp_print(p, length, caplen);
 234                 return (1);
 235
 236         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 237                 if (vflag)
 238                         fputs("et1 ", stdout);
 239                 atalk_print(p, length);
 240                 return (1);
 241
 242         default:
 243                 return (0);
 244         }
 245 }