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 <stdio.h>
  29 #include <pcap.h>
  30
  31 #include "interface.h"
  32 #include "extract.h"
  33 #include "addrtoname.h"
  34 #include "ethertype.h"
  35
  36 /*
  37  * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
  38  */
  39 #define FIREWIRE_EUI64_LEN      8
  40 struct firewire_header {
  41         u_char  firewire_dhost[FIREWIRE_EUI64_LEN];
  42         u_char  firewire_shost[FIREWIRE_EUI64_LEN];
  43         u_short firewire_type;
  44 };
  45
  46 /*
  47  * Length of that header; note that some compilers may pad
  48  * "struct firewire_header" to a multiple of 4 bytes, for example, so
  49  * "sizeof (struct firewire_header)" may not give the right answer.
  50  */
  51 #define FIREWIRE_HDRLEN         18
  52
  53 static inline void
  54 ap1394_hdr_print(register const u_char *bp, u_int length)
  55 {
  56         register const struct firewire_header *fp;
  57         u_int16_t firewire_type;
  58
  59         fp = (const struct firewire_header *)bp;
  60
  61         (void)printf("%s > %s",
  62                      linkaddr_string(fp->firewire_dhost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN),
  63                      linkaddr_string(fp->firewire_shost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN));
  64
  65         firewire_type = EXTRACT_16BITS(&fp->firewire_type);
  66         if (!qflag) {
  67                 (void)printf(", ethertype %s (0x%04x)",
  68                                tok2str(ethertype_values,"Unknown", firewire_type),
  69                                firewire_type);
  70         } else {
  71                 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type));
  72         }
  73
  74         (void)printf(", length %u: ", length);
  75 }
  76
  77 /*
  78  * This is the top level routine of the printer.  'p' points
  79  * to the ether header of the packet, 'h->ts' is the timestamp,
  80  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  81  * is the number of bytes actually captured.
  82  */
  83 u_int
  84 ap1394_if_print(const struct pcap_pkthdr *h, const u_char *p)
  85 {
  86         u_int length = h->len;
  87         u_int caplen = h->caplen;
  88         struct firewire_header *fp;
  89         u_short ether_type;
  90
  91         if (caplen < FIREWIRE_HDRLEN) {
  92                 printf("[|ap1394]");
  93                 return FIREWIRE_HDRLEN;
  94         }
  95
  96         if (eflag)
  97                 ap1394_hdr_print(p, length);
  98
  99         length -= FIREWIRE_HDRLEN;
 100         caplen -= FIREWIRE_HDRLEN;
 101         fp = (struct firewire_header *)p;
 102         p += FIREWIRE_HDRLEN;
 103
 104         ether_type = EXTRACT_16BITS(&fp->firewire_type);
 105         if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) {
 106                 /* ether_type not known, print raw packet */
 107                 if (!eflag)
 108                         ap1394_hdr_print((u_char *)fp, length + FIREWIRE_HDRLEN);
 109
 110                 if (!suppress_default_print)
 111                         default_print(p, caplen);
 112         }
 113
 114         return FIREWIRE_HDRLEN;
 115 }