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 u_char firewire_dhost[FIREWIRE_EUI64_LEN];
41 u_char firewire_shost[FIREWIRE_EUI64_LEN];
42 u_short 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 *
fwaddr_string(netdissect_options * ndo,const u_char * addr)53 fwaddr_string(netdissect_options *ndo, const u_char *addr)
54 {
55 return (linkaddr_string(ndo, addr, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN));
56 }
57
58 static inline void
ap1394_hdr_print(netdissect_options * ndo,register const u_char * bp,u_int length)59 ap1394_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
60 {
61 register const struct firewire_header *fp;
62 uint16_t firewire_type;
63
64 fp = (const struct firewire_header *)bp;
65
66 ND_PRINT((ndo, "%s > %s",
67 fwaddr_string(ndo, fp->firewire_shost),
68 fwaddr_string(ndo, fp->firewire_dhost)));
69
70 firewire_type = EXTRACT_16BITS(&fp->firewire_type);
71 if (!ndo->ndo_qflag) {
72 ND_PRINT((ndo, ", ethertype %s (0x%04x)",
73 tok2str(ethertype_values,"Unknown", firewire_type),
74 firewire_type));
75 } else {
76 ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type)));
77 }
78
79 ND_PRINT((ndo, ", 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 u_int
ap1394_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)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 if (caplen < FIREWIRE_HDRLEN) {
98 ND_PRINT((ndo, "[|ap1394]"));
99 return FIREWIRE_HDRLEN;
100 }
101
102 if (ndo->ndo_eflag)
103 ap1394_hdr_print(ndo, p, length);
104
105 length -= FIREWIRE_HDRLEN;
106 caplen -= FIREWIRE_HDRLEN;
107 fp = (const struct firewire_header *)p;
108 p += FIREWIRE_HDRLEN;
109
110 ether_type = EXTRACT_16BITS(&fp->firewire_type);
111 src.addr = fp->firewire_shost;
112 src.addr_string = fwaddr_string;
113 dst.addr = fp->firewire_dhost;
114 dst.addr_string = fwaddr_string;
115 if (ethertype_print(ndo, ether_type, p, length, caplen, &src, &dst) == 0) {
116 /* ether_type not known, print raw packet */
117 if (!ndo->ndo_eflag)
118 ap1394_hdr_print(ndo, (const u_char *)fp, length + FIREWIRE_HDRLEN);
119
120 if (!ndo->ndo_suppress_default_print)
121 ND_DEFAULTPRINT(p, caplen);
122 }
123
124 return FIREWIRE_HDRLEN;
125 }
126