2 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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
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.
25 static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.57 2006-03-23 14:58:44 hannes Exp $ (LBL)";
33 #include <tcpdump-stdinc.h>
39 #include "interface.h"
40 #include "addrtoname.h"
49 * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
50 * 32-bit integer that specifies the family, e.g. AF_INET.
52 * Note here that "host" refers to the host on which the packets were
53 * captured; that isn't necessarily *this* host.
55 * The OpenBSD DLT_LOOP packet header is the same, except that the integer
56 * is in network byte order.
61 * Byte-swap a 32-bit number.
62 * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
63 * big-endian platforms.)
66 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
69 null_hdr_print(u_int family, u_int length)
72 (void)printf("AF %s (%u)",
73 tok2str(bsd_af_values,"Unknown",family),family);
76 tok2str(bsd_af_values,"Unknown AF %u",family));
79 (void)printf(", length %u: ", length);
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.
89 null_if_print(const struct pcap_pkthdr *h, const u_char *p)
91 u_int length = h->len;
92 u_int caplen = h->caplen;
95 if (caplen < NULL_HDRLEN) {
100 memcpy((char *)&family, (char *)p, sizeof(family));
103 * This isn't necessarily in our host byte order; if this is
104 * a DLT_LOOP capture, it's in network byte order, and if
105 * this is a DLT_NULL capture from a machine with the opposite
106 * byte-order, it's in the opposite byte order from ours.
108 * If the upper 16 bits aren't all zero, assume it's byte-swapped.
110 if ((family & 0xFFFF0000) != 0)
111 family = SWAPLONG(family);
114 null_hdr_print(family, length);
116 length -= NULL_HDRLEN;
117 caplen -= NULL_HDRLEN;
123 ip_print(gndo, p, length);
127 case BSD_AFNUM_INET6_BSD:
128 case BSD_AFNUM_INET6_FREEBSD:
129 case BSD_AFNUM_INET6_DARWIN:
130 ip6_print(p, length);
135 isoclns_print(p, length, caplen);
138 case BSD_AFNUM_APPLETALK:
139 atalk_print(p, length);
143 ipx_print(p, length);
147 /* unknown AF_ value */
149 null_hdr_print(family, length + NULL_HDRLEN);
150 if (!suppress_default_print)
151 default_print(p, caplen);
154 return (NULL_HDRLEN);
159 * c-style: whitesmith