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[dragonfly.git] / contrib / tcpdump / print-null.c
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1/*
2 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
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#ifndef lint
23static const char rcsid[] _U_ =
ea7b4bf5 24 "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.57 2006-03-23 14:58:44 hannes Exp $ (LBL)";
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25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <tcpdump-stdinc.h>
32
33#include <pcap.h>
34#include <stdio.h>
35#include <string.h>
36
37#include "interface.h"
38#include "addrtoname.h"
39
40#include "ip.h"
41#ifdef INET6
42#include "ip6.h"
43#endif
ea7b4bf5 44#include "af.h"
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45
46/*
47 * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
48 * 32-bit integer that specifies the family, e.g. AF_INET.
49 *
50 * Note here that "host" refers to the host on which the packets were
51 * captured; that isn't necessarily *this* host.
52 *
53 * The OpenBSD DLT_LOOP packet header is the same, except that the integer
54 * is in network byte order.
55 */
56#define NULL_HDRLEN 4
57
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58/*
59 * Byte-swap a 32-bit number.
60 * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
61 * big-endian platforms.)
62 */
63#define SWAPLONG(y) \
64((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
65
66static inline void
67null_hdr_print(u_int family, u_int length)
68{
69 if (!qflag) {
70 (void)printf("AF %s (%u)",
71 tok2str(bsd_af_values,"Unknown",family),family);
72 } else {
73 (void)printf("%s",
74 tok2str(bsd_af_values,"Unknown AF %u",family));
75 }
76
77 (void)printf(", length %u: ", length);
78}
79
80/*
81 * This is the top level routine of the printer. 'p' points
82 * to the ether header of the packet, 'h->ts' is the timestamp,
83 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
84 * is the number of bytes actually captured.
85 */
86u_int
87null_if_print(const struct pcap_pkthdr *h, const u_char *p)
88{
89 u_int length = h->len;
90 u_int caplen = h->caplen;
91 u_int family;
92
93 if (caplen < NULL_HDRLEN) {
94 printf("[|null]");
95 return (NULL_HDRLEN);
96 }
97
98 memcpy((char *)&family, (char *)p, sizeof(family));
99
100 /*
101 * This isn't necessarily in our host byte order; if this is
102 * a DLT_LOOP capture, it's in network byte order, and if
103 * this is a DLT_NULL capture from a machine with the opposite
104 * byte-order, it's in the opposite byte order from ours.
105 *
106 * If the upper 16 bits aren't all zero, assume it's byte-swapped.
107 */
108 if ((family & 0xFFFF0000) != 0)
109 family = SWAPLONG(family);
110
111 if (eflag)
112 null_hdr_print(family, length);
113
114 length -= NULL_HDRLEN;
115 caplen -= NULL_HDRLEN;
116 p += NULL_HDRLEN;
117
118 switch (family) {
119
66170f0a 120 case BSD_AFNUM_INET:
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121 ip_print(gndo, p, length);
122 break;
123
124#ifdef INET6
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125 case BSD_AFNUM_INET6_BSD:
126 case BSD_AFNUM_INET6_FREEBSD:
127 case BSD_AFNUM_INET6_DARWIN:
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128 ip6_print(p, length);
129 break;
130#endif
131
66170f0a 132 case BSD_AFNUM_ISO:
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133 isoclns_print(p, length, caplen);
134 break;
135
66170f0a 136 case BSD_AFNUM_APPLETALK:
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137 atalk_print(p, length);
138 break;
139
66170f0a 140 case BSD_AFNUM_IPX:
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141 ipx_print(p, length);
142 break;
143
144 default:
145 /* unknown AF_ value */
146 if (!eflag)
147 null_hdr_print(family, length + NULL_HDRLEN);
148 if (!suppress_default_print)
149 default_print(p, caplen);
150 }
151
152 return (NULL_HDRLEN);
153}
154
155/*
156 * Local Variables:
157 * c-style: whitesmith
158 * c-basic-offset: 8
159 * End:
160 */