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 #define FIREWIRE_EUI64_LEN      8
  38 struct firewire_header {
  39         nd_byte     firewire_dhost[FIREWIRE_EUI64_LEN];
  40         nd_byte     firewire_shost[FIREWIRE_EUI64_LEN];
  41         nd_uint16_t 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 const char *
  52 fwaddr_string(netdissect_options *ndo, const u_char *addr)
  53 {
  54         return GET_LINKADDR_STRING(addr, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN);
  55 }
  56
  57 static void
  58 ap1394_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
  59 {
  60         const struct firewire_header *fp;
  61         uint16_t firewire_type;
  62
  63         fp = (const struct firewire_header *)bp;
  64
  65         ND_PRINT("%s > %s",
  66                      fwaddr_string(ndo, fp->firewire_shost),
  67                      fwaddr_string(ndo, fp->firewire_dhost));
  68
  69         firewire_type = GET_BE_U_2(fp->firewire_type);
  70         if (!ndo->ndo_qflag) {
  71                 ND_PRINT(", ethertype %s (0x%04x)",
  72                                tok2str(ethertype_values,"Unknown", firewire_type),
  73                                firewire_type);
  74         } else {
  75                 ND_PRINT(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type));
  76         }
  77
  78         ND_PRINT(", length %u: ", length);
  79 }
  80
  81 /*
  82  * This is the top level routine of the printer.  'p' points
  83  * to the ether header of the packet, 'h->ts' is the timestamp,
  84  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  85  * is the number of bytes actually captured.
  86  */
  87 void
  88 ap1394_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
  89 {
  90         u_int length = h->len;
  91         u_int caplen = h->caplen;
  92         const struct firewire_header *fp;
  93         u_short ether_type;
  94         struct lladdr_info src, dst;
  95
  96         ndo->ndo_protocol = "ap1394";
  97         ND_TCHECK_LEN(p, FIREWIRE_HDRLEN);
  98         ndo->ndo_ll_hdr_len += FIREWIRE_HDRLEN;
  99
 100         if (ndo->ndo_eflag)
 101                 ap1394_hdr_print(ndo, p, length);
 102
 103         length -= FIREWIRE_HDRLEN;
 104         caplen -= FIREWIRE_HDRLEN;
 105         fp = (const struct firewire_header *)p;
 106         p += FIREWIRE_HDRLEN;
 107
 108         ether_type = GET_BE_U_2(fp->firewire_type);
 109         src.addr = fp->firewire_shost;
 110         src.addr_string = fwaddr_string;
 111         dst.addr = fp->firewire_dhost;
 112         dst.addr_string = fwaddr_string;
 113         if (ethertype_print(ndo, ether_type, p, length, caplen, &src, &dst) == 0) {
 114                 /* ether_type not known, print raw packet */
 115                 if (!ndo->ndo_eflag)
 116                         ap1394_hdr_print(ndo, (const u_char *)fp, length + FIREWIRE_HDRLEN);
 117
 118                 if (!ndo->ndo_suppress_default_print)
 119                         ND_DEFAULTPRINT(p, caplen);
 120         }
 121 }