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