external/bsd/tcpdump/dist/print-ap1394.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   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 #include <sys/cdefs.h>
  22 #ifndef lint
  23 __RCSID("$NetBSD: print-ap1394.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  24 #endif
  25
  26 #define NETDISSECT_REWORKED
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include "interface.h"
  34 #include "extract.h"
  35 #include "addrtoname.h"
  36 #include "ethertype.h"
  37
  38 /*
  39  * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
  40  */
  41 #define FIREWIRE_EUI64_LEN      8
  42 struct firewire_header {
  43         u_char  firewire_dhost[FIREWIRE_EUI64_LEN];
  44         u_char  firewire_shost[FIREWIRE_EUI64_LEN];
  45         u_short firewire_type;
  46 };
  47
  48 /*
  49  * Length of that header; note that some compilers may pad
  50  * "struct firewire_header" to a multiple of 4 bytes, for example, so
  51  * "sizeof (struct firewire_header)" may not give the right answer.
  52  */
  53 #define FIREWIRE_HDRLEN         18
  54
  55 static inline void
  56 ap1394_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
  57 {
  58         register const struct firewire_header *fp;
  59         uint16_t firewire_type;
  60
  61         fp = (const struct firewire_header *)bp;
  62
  63         ND_PRINT((ndo, "%s > %s",
  64                      linkaddr_string(ndo, fp->firewire_dhost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN),
  65                      linkaddr_string(ndo, fp->firewire_shost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN)));
  66
  67         firewire_type = EXTRACT_16BITS(&fp->firewire_type);
  68         if (!ndo->ndo_qflag) {
  69                 ND_PRINT((ndo, ", ethertype %s (0x%04x)",
  70                                tok2str(ethertype_values,"Unknown", firewire_type),
  71                                firewire_type));
  72         } else {
  73                 ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type)));
  74         }
  75
  76         ND_PRINT((ndo, ", length %u: ", length));
  77 }
  78
  79 /*
  80  * This is the top level routine of the printer.  'p' points
  81  * to the ether header of the packet, 'h->ts' is the timestamp,
  82  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  83  * is the number of bytes actually captured.
  84  */
  85 u_int
  86 ap1394_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
  87 {
  88         u_int length = h->len;
  89         u_int caplen = h->caplen;
  90         struct firewire_header *fp;
  91         u_short ether_type;
  92
  93         if (caplen < FIREWIRE_HDRLEN) {
  94                 ND_PRINT((ndo, "[|ap1394]"));
  95                 return FIREWIRE_HDRLEN;
  96         }
  97
  98         if (ndo->ndo_eflag)
  99                 ap1394_hdr_print(ndo, p, length);
 100
 101         length -= FIREWIRE_HDRLEN;
 102         caplen -= FIREWIRE_HDRLEN;
 103         fp = (struct firewire_header *)p;
 104         p += FIREWIRE_HDRLEN;
 105
 106         ether_type = EXTRACT_16BITS(&fp->firewire_type);
 107         if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 108                 /* ether_type not known, print raw packet */
 109                 if (!ndo->ndo_eflag)
 110                         ap1394_hdr_print(ndo, (u_char *)fp, length + FIREWIRE_HDRLEN);
 111
 112                 if (!ndo->ndo_suppress_default_print)
 113                         ND_DEFAULTPRINT(p, caplen);
 114         }
 115
 116         return FIREWIRE_HDRLEN;
 117 }