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 1.2 2001-04-24 02:26:14 guy 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 const u_char *packetp;
  48 const u_char *snapend;
  49
  50 int arcnet_encap_print(u_char arctype, const u_char *p,
  51     u_int length, u_int caplen);
  52
  53 struct arctype_map {
  54         const int arctype;
  55         char * const name;
  56 } arctypemap[] = {
  57         { ARCTYPE_IP_OLD,       "oldip" },
  58         { ARCTYPE_ARP_OLD,      "oldarp" },
  59         { ARCTYPE_IP,           "ip" },
  60         { ARCTYPE_ARP,          "arp" },
  61         { ARCTYPE_REVARP,       "rarp" },
  62         { ARCTYPE_ATALK,        "atalk" },
  63         { ARCTYPE_BANIAN,       "banyan" },
  64         { ARCTYPE_IPX,          "ipx" },
  65         { ARCTYPE_INET6,        "ipv6" },
  66         { ARCTYPE_DIAGNOSE,     "diag" },
  67         { 0, 0 }
  68 };
  69
  70 static inline void
  71 arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
  72 {
  73         const struct arc_header *ap;
  74         struct arctype_map *atmp;
  75         char *arctypename;
  76         char typebuf[3];
  77
  78
  79         ap = (const struct arc_header *)bp;
  80
  81
  82         if (qflag) {
  83                 (void)printf("%02x %02x %d: ",
  84                              ap->arc_shost,
  85                              ap->arc_dhost,
  86                              length);
  87                 return;
  88         }
  89
  90         for (arctypename = NULL, atmp = arctypemap; atmp->arctype; atmp++) {
  91                 if (atmp->arctype == ap->arc_type) {
  92                         arctypename = atmp->name;
  93                         break;
  94                 }
  95         }
  96         if (!arctypename) {
  97                 arctypename = typebuf;
  98                 (void)snprintf(typebuf, sizeof(typebuf), "%02x", ap->arc_type);
  99         }
 100
 101         if (!phds) {
 102                 (void)printf("%02x %02x %s %d: ",
 103                              ap->arc_shost, ap->arc_dhost, arctypename,
 104                              length);
 105                              return;
 106         }
 107
 108         if (flag == 0) {
 109                 (void)printf("%02x %02x %s seqid %04x %d: ",
 110                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 111                         length);
 112                         return;
 113         }
 114
 115         if (flag & 1)
 116                 (void)printf("%02x %02x %s seqid %04x "
 117                         "(first of %d fragments) %d: ",
 118                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 119                         (flag + 3) / 2, length);
 120         else
 121                 (void)printf("%02x %02x %s seqid %04x "
 122                         "(fragment %d) %d: ",
 123                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 124                         flag/2 + 1, length);
 125 }
 126
 127 /*
 128  * This is the top level routine of the printer.  'p' is the points
 129  * to the ether header of the packet, 'tvp' is the timestamp,
 130  * 'length' is the length of the packet off the wire, and 'caplen'
 131  * is the number of bytes actually captured.
 132  */
 133 void
 134 arcnet_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
 135 {
 136         u_int caplen = h->caplen;
 137         u_int length = h->len;
 138         struct arc_header *ap;
 139
 140         int phds, flag = 0, archdrlen;
 141         u_int seqid = 0;
 142         u_char arc_type;
 143
 144         ts_print(&h->ts);
 145
 146         if (caplen < ARC_HDRLEN) {
 147                 printf("[|arcnet]");
 148                 goto out;
 149         }
 150
 151         ap = (struct arc_header *)p;
 152         arc_type = ap->arc_type;
 153
 154         switch (arc_type) {
 155         default:
 156                 phds = 1;
 157                 break;
 158         case ARCTYPE_IP_OLD:
 159         case ARCTYPE_ARP_OLD:
 160         case ARCTYPE_DIAGNOSE:
 161                 phds = 0;
 162                 archdrlen = ARC_HDRLEN;
 163                 break;
 164         }
 165
 166         if (phds) {
 167                 if (caplen < ARC_HDRNEWLEN) {
 168                         arcnet_print(p, length, 0, 0, 0);
 169                         printf("[|phds]");
 170                         goto out;
 171                 }
 172
 173                 if (ap->arc_flag == 0xff) {
 174                         if (caplen < ARC_HDRNEWLEN_EXC) {
 175                                 arcnet_print(p, length, 0, 0, 0);
 176                                 printf("[|phds extended]");
 177                                 goto out;
 178                         }
 179                         flag = ap->arc_flag2;
 180                         seqid = ap->arc_seqid2;
 181                         archdrlen = ARC_HDRNEWLEN_EXC;
 182                 } else {
 183                         flag = ap->arc_flag;
 184                         seqid = ap->arc_seqid;
 185                         archdrlen = ARC_HDRNEWLEN;
 186                 }
 187         }
 188
 189
 190         if (eflag)
 191                 arcnet_print(p, length, phds, flag, seqid);
 192
 193         /*
 194          * Some printers want to get back at the ethernet addresses,
 195          * and/or check that they're not walking off the end of the packet.
 196          * Rather than pass them all the way down, we set these globals.
 197          */
 198         packetp = p;
 199         snapend = p + caplen;
 200
 201         length -= archdrlen;
 202         caplen -= archdrlen;
 203         p += archdrlen;
 204
 205         if (phds && flag && (flag & 1) == 0)
 206                 goto out2;
 207
 208         if (!arcnet_encap_print(arc_type, p, length, caplen)) {
 209                 default_print(p, caplen);
 210                 goto out;
 211         }
 212
 213  out2:
 214         if (xflag)
 215                 default_print(p, caplen);
 216
 217  out:
 218         putchar('\n');
 219 }
 220
 221 /*
 222  * Prints the packet encapsulated in an ARCnet data field,
 223  * given the ARCnet system code.
 224  *
 225  * Returns non-zero if it can do so, zero if the system code is unknown.
 226  */
 227
 228
 229 int
 230 arcnet_encap_print(u_char arctype, const u_char *p,
 231     u_int length, u_int caplen)
 232 {
 233         switch (arctype) {
 234
 235         case ARCTYPE_IP_OLD:
 236         case ARCTYPE_IP:
 237                 ip_print(p, length);
 238                 return (1);
 239
 240 #ifdef INET6
 241         case ARCTYPE_INET6:
 242                 ip6_print(p, length);
 243                 return (1);
 244 #endif /*INET6*/
 245
 246         case ARCTYPE_ARP_OLD:
 247         case ARCTYPE_ARP:
 248         case ARCTYPE_REVARP:
 249                 arp_print(p, length, caplen);
 250                 return (1);
 251
 252         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 253                 if (vflag)
 254                         fputs("et1 ", stdout);
 255                 atalk_print(p, length);
 256                 return (1);
 257
 258         default:
 259                 return (0);
 260         }
 261 }