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 1.53.2.3 2005/07/07 01:24:38 guy Exp $ (LBL)";
33 #include <tcpdump-stdinc.h>
39 #include "interface.h"
40 #include "addrtoname.h"
48 * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
49 * 32-bit integer that specifies the family, e.g. AF_INET.
51 * Note here that "host" refers to the host on which the packets were
52 * captured; that isn't necessarily *this* host.
54 * The OpenBSD DLT_LOOP packet header is the same, except that the integer
55 * is in network byte order.
62 * Unfortunately, the BSDs don't all use the same value for AF_INET6,
63 * so, because we want to be able to read captures from all of the BSDs,
64 * we check for all of them.
67 #define BSD_AF_NS 6 /* XEROX NS protocols */
69 #define BSD_AF_APPLETALK 16
71 #define BSD_AF_INET6_BSD 24 /* OpenBSD (and probably NetBSD), BSD/OS */
72 #define BSD_AF_INET6_FREEBSD 28
73 #define BSD_AF_INET6_DARWIN 30
75 const struct tok bsd_af_values[] = {
76 { BSD_AF_INET, "IPv4" },
78 { BSD_AF_ISO, "ISO" },
79 { BSD_AF_APPLETALK, "Appletalk" },
80 { BSD_AF_IPX, "IPX" },
81 { BSD_AF_INET6_BSD, "IPv6" },
82 { BSD_AF_INET6_FREEBSD, "IPv6" },
83 { BSD_AF_INET6_DARWIN, "IPv6" },
89 * Byte-swap a 32-bit number.
90 * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
91 * big-endian platforms.)
94 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
97 null_hdr_print(u_int family, u_int length)
100 (void)printf("AF %s (%u)",
101 tok2str(bsd_af_values,"Unknown",family),family);
104 tok2str(bsd_af_values,"Unknown AF %u",family));
107 (void)printf(", length %u: ", length);
111 * This is the top level routine of the printer. 'p' points
112 * to the ether header of the packet, 'h->ts' is the timestamp,
113 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
114 * is the number of bytes actually captured.
117 null_if_print(const struct pcap_pkthdr *h, const u_char *p)
119 u_int length = h->len;
120 u_int caplen = h->caplen;
123 if (caplen < NULL_HDRLEN) {
125 return (NULL_HDRLEN);
128 memcpy((char *)&family, (char *)p, sizeof(family));
131 * This isn't necessarily in our host byte order; if this is
132 * a DLT_LOOP capture, it's in network byte order, and if
133 * this is a DLT_NULL capture from a machine with the opposite
134 * byte-order, it's in the opposite byte order from ours.
136 * If the upper 16 bits aren't all zero, assume it's byte-swapped.
138 if ((family & 0xFFFF0000) != 0)
139 family = SWAPLONG(family);
142 null_hdr_print(family, length);
144 length -= NULL_HDRLEN;
145 caplen -= NULL_HDRLEN;
151 ip_print(gndo, p, length);
155 case BSD_AF_INET6_BSD:
156 case BSD_AF_INET6_FREEBSD:
157 case BSD_AF_INET6_DARWIN:
158 ip6_print(p, length);
163 isoclns_print(p, length, caplen);
166 case BSD_AF_APPLETALK:
167 atalk_print(p, length);
171 ipx_print(p, length);
175 /* unknown AF_ value */
177 null_hdr_print(family, length + NULL_HDRLEN);
178 if (!suppress_default_print)
179 default_print(p, caplen);
182 return (NULL_HDRLEN);
187 * c-style: whitesmith