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 /* \summary: Apple IP-over-IEEE 1394 printer */
  23
  24 #include <config.h>
  25
  26 #include "netdissect-stdinc.h"
  27
  28 #define ND_LONGJMP_FROM_TCHECK
  29 #include "netdissect.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 struct firewire_header {
  38         nd_eui64    firewire_dhost;
  39         nd_eui64    firewire_shost;
  40         nd_uint16_t 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  * (That could be true even though we're using nd_ types, none of
  48  * which should require anything more than byte alignment.)
  49  */
  50 #define FIREWIRE_HDRLEN         18
  51
  52 static void
  53 ap1394_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  54 {
  55         const struct firewire_header *fp;
  56         uint16_t firewire_type;
  57
  58         fp = (const struct firewire_header *)bp;
  59
  60         ND_PRINT("%s > %s",
  61                      eui64_string(ndo, fp->firewire_shost),
  62                      eui64_string(ndo, fp->firewire_dhost));
  63
  64         firewire_type = GET_BE_U_2(fp->firewire_type);
  65         if (!ndo->ndo_qflag) {
  66                 ND_PRINT(", ethertype %s (0x%04x)",
  67                                tok2str(ethertype_values,"Unknown", firewire_type),
  68                                firewire_type);
  69         } else {
  70                 ND_PRINT(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type));
  71         }
  72
  73         ND_PRINT(", length %u: ", length);
  74 }
  75
  76 /*
  77  * This is the top level routine of the printer.  'p' points
  78  * to the ether header of the packet, 'h->ts' is the timestamp,
  79  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  80  * is the number of bytes actually captured.
  81  */
  82 void
  83 ap1394_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
  84 {
  85         u_int length = h->len;
  86         u_int caplen = h->caplen;
  87         const struct firewire_header *fp;
  88         u_short ether_type;
  89         struct lladdr_info src, dst;
  90
  91         ndo->ndo_protocol = "ap1394";
  92         ND_TCHECK_LEN(p, FIREWIRE_HDRLEN);
  93         ndo->ndo_ll_hdr_len += FIREWIRE_HDRLEN;
  94
  95         if (ndo->ndo_eflag)
  96                 ap1394_hdr_print(ndo, p, length);
  97
  98         length -= FIREWIRE_HDRLEN;
  99         caplen -= FIREWIRE_HDRLEN;
 100         fp = (const struct firewire_header *)p;
 101         p += FIREWIRE_HDRLEN;
 102
 103         ether_type = GET_BE_U_2(fp->firewire_type);
 104         src.addr = fp->firewire_shost;
 105         src.addr_string = eui64_string;
 106         dst.addr = fp->firewire_dhost;
 107         dst.addr_string = eui64_string;
 108         if (ethertype_print(ndo, ether_type, p, length, caplen, &src, &dst) == 0) {
 109                 /* ether_type not known, print raw packet */
 110                 if (!ndo->ndo_eflag)
 111                         ap1394_hdr_print(ndo, (const u_char *)fp, length + FIREWIRE_HDRLEN);
 112
 113                 if (!ndo->ndo_suppress_default_print)
 114                         ND_DEFAULTPRINT(p, caplen);
 115         }
 116 }