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 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #include "netdissect.h"
  31 #include "extract.h"
  32 #include "addrtoname.h"
  33 #include "ethertype.h"
  34
  35 /*
  36  * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
  37  */
  38 #define FIREWIRE_EUI64_LEN      8
  39 struct firewire_header {
  40         nd_byte     firewire_dhost[FIREWIRE_EUI64_LEN];
  41         nd_byte     firewire_shost[FIREWIRE_EUI64_LEN];
  42         nd_uint16_t firewire_type;
  43 };
  44
  45 /*
  46  * Length of that header; note that some compilers may pad
  47  * "struct firewire_header" to a multiple of 4 bytes, for example, so
  48  * "sizeof (struct firewire_header)" may not give the right answer.
  49  */
  50 #define FIREWIRE_HDRLEN         18
  51
  52 static const char *
  53 fwaddr_string(netdissect_options *ndo, const u_char *addr)
  54 {
  55         return GET_LINKADDR_STRING(addr, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN);
  56 }
  57
  58 static void
  59 ap1394_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  60 {
  61         const struct firewire_header *fp;
  62         uint16_t firewire_type;
  63
  64         fp = (const struct firewire_header *)bp;
  65
  66         ND_PRINT("%s > %s",
  67                      fwaddr_string(ndo, fp->firewire_shost),
  68                      fwaddr_string(ndo, fp->firewire_dhost));
  69
  70         firewire_type = GET_BE_U_2(fp->firewire_type);
  71         if (!ndo->ndo_qflag) {
  72                 ND_PRINT(", ethertype %s (0x%04x)",
  73                                tok2str(ethertype_values,"Unknown", firewire_type),
  74                                firewire_type);
  75         } else {
  76                 ND_PRINT(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type));
  77         }
  78
  79         ND_PRINT(", length %u: ", length);
  80 }
  81
  82 /*
  83  * This is the top level routine of the printer.  'p' points
  84  * to the ether header of the packet, 'h->ts' is the timestamp,
  85  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  86  * is the number of bytes actually captured.
  87  */
  88 void
  89 ap1394_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
  90 {
  91         u_int length = h->len;
  92         u_int caplen = h->caplen;
  93         const struct firewire_header *fp;
  94         u_short ether_type;
  95         struct lladdr_info src, dst;
  96
  97         ndo->ndo_protocol = "ap1394";
  98         if (caplen < FIREWIRE_HDRLEN) {
  99                 ndo->ndo_ll_hdr_len += caplen;
 100                 nd_print_trunc(ndo);
 101                 return;
 102         }
 103         ndo->ndo_ll_hdr_len += FIREWIRE_HDRLEN;
 104
 105         if (ndo->ndo_eflag)
 106                 ap1394_hdr_print(ndo, p, length);
 107
 108         length -= FIREWIRE_HDRLEN;
 109         caplen -= FIREWIRE_HDRLEN;
 110         fp = (const struct firewire_header *)p;
 111         p += FIREWIRE_HDRLEN;
 112
 113         ether_type = GET_BE_U_2(fp->firewire_type);
 114         src.addr = fp->firewire_shost;
 115         src.addr_string = fwaddr_string;
 116         dst.addr = fp->firewire_dhost;
 117         dst.addr_string = fwaddr_string;
 118         if (ethertype_print(ndo, ether_type, p, length, caplen, &src, &dst) == 0) {
 119                 /* ether_type not known, print raw packet */
 120                 if (!ndo->ndo_eflag)
 121                         ap1394_hdr_print(ndo, (const u_char *)fp, length + FIREWIRE_HDRLEN);
 122
 123                 if (!ndo->ndo_suppress_default_print)
 124                         ND_DEFAULTPRINT(p, caplen);
 125         }
 126 }