tcpdump.tproj/print-arp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that: (1) source code distributions
  30  * retain the above copyright notice and this paragraph in its entirety, (2)
  31  * distributions including binary code include the above copyright notice and
  32  * this paragraph in its entirety in the documentation or other materials
  33  * provided with the distribution, and (3) all advertising materials mentioning
  34  * features or use of this software display the following acknowledgement:
  35  * ``This product includes software developed by the University of California,
  36  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  37  * the University nor the names of its contributors may be used to endorse
  38  * or promote products derived from this software without specific prior
  39  * written permission.
  40  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  41  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  42  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  43  */
  44
  45 #ifndef lint
  46 static const char rcsid[] =
  47     "@(#) $Header: /cvs/Darwin/Commands/NeXT/network_cmds/tcpdump.tproj/print-arp.c,v 1.1.1.1 1999/05/02 03:58:32 wsanchez Exp $ (LBL)";
  48 #endif
  49
  50 #include <sys/param.h>
  51 #include <sys/time.h>
  52 #include <sys/socket.h>
  53
  54 #if __STDC__
  55 struct mbuf;
  56 struct rtentry;
  57 #endif
  58 #include <net/if.h>
  59
  60 #include <netinet/in.h>
  61 #include <netinet/if_ether.h>
  62
  63 #include <stdio.h>
  64 #include <string.h>
  65
  66 #include "interface.h"
  67 #include "addrtoname.h"
  68 #include "ethertype.h"
  69 #include "extract.h"                    /* must come after interface.h */
  70
  71 /* Compatibility */
  72 #ifndef REVARP_REQUEST
  73 #define REVARP_REQUEST          3
  74 #endif
  75 #ifndef REVARP_REPLY
  76 #define REVARP_REPLY            4
  77 #endif
  78
  79 static u_char ezero[6];
  80
  81 void
  82 arp_print(register const u_char *bp, u_int length, u_int caplen)
  83 {
  84         register const struct ether_arp *ap;
  85         register const struct ether_header *eh;
  86         register u_short pro, hrd, op;
  87
  88         ap = (struct ether_arp *)bp;
  89         if ((u_char *)(ap + 1) > snapend) {
  90                 printf("[|arp]");
  91                 return;
  92         }
  93         if (length < sizeof(struct ether_arp)) {
  94                 (void)printf("truncated-arp");
  95                 default_print((u_char *)ap, length);
  96                 return;
  97         }
  98
  99         pro = EXTRACT_16BITS(&ap->arp_pro);
 100         hrd = EXTRACT_16BITS(&ap->arp_hrd);
 101         op = EXTRACT_16BITS(&ap->arp_op);
 102
 103         if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
 104             || ap->arp_hln != sizeof(SHA(ap))
 105             || ap->arp_pln != sizeof(SPA(ap))) {
 106                 (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
 107                                 op, pro, ap->arp_pln,
 108                                 hrd, ap->arp_hln);
 109                 return;
 110         }
 111         if (pro == ETHERTYPE_TRAIL)
 112                 (void)printf("trailer-");
 113         eh = (struct ether_header *)packetp;
 114         switch (op) {
 115
 116         case ARPOP_REQUEST:
 117                 (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
 118                 if (memcmp((char *)ezero, (char *)THA(ap), 6) != 0)
 119                         (void)printf(" (%s)", etheraddr_string(THA(ap)));
 120                 (void)printf(" tell %s", ipaddr_string(SPA(ap)));
 121                 if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
 122                         (void)printf(" (%s)", etheraddr_string(SHA(ap)));
 123                 break;
 124
 125         case ARPOP_REPLY:
 126                 (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
 127                 if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
 128                         (void)printf(" (%s)", etheraddr_string(SHA(ap)));
 129                 (void)printf(" is-at %s", etheraddr_string(SHA(ap)));
 130                 if (memcmp((char *)EDST(eh), (char *)THA(ap), 6) != 0)
 131                         (void)printf(" (%s)", etheraddr_string(THA(ap)));
 132                 break;
 133
 134         case REVARP_REQUEST:
 135                 (void)printf("rarp who-is %s tell %s",
 136                         etheraddr_string(THA(ap)),
 137                         etheraddr_string(SHA(ap)));
 138                 break;
 139
 140         case REVARP_REPLY:
 141                 (void)printf("rarp reply %s at %s",
 142                         etheraddr_string(THA(ap)),
 143                         ipaddr_string(TPA(ap)));
 144                 break;
 145
 146         default:
 147                 (void)printf("arp-#%d", op);
 148                 default_print((u_char *)ap, caplen);
 149                 return;
 150         }
 151         if (hrd != ARPHRD_ETHER)
 152                 printf(" hardware #%d", hrd);
 153 }