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