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 *
fwaddr_string(netdissect_options * ndo,const u_char * addr)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
ap1394_hdr_print(netdissect_options * ndo,const u_char * bp,u_int length)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
ap1394_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)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 }
122