191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/*
|
|
* Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
* distributions including binary code include the above copyright notice and
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
* features or use of this software display the following acknowledgement:
|
|
* ``This product includes software developed by the University of California,
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
* the University nor the names of its contributors may be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] _U_ =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.53.2.2 2005/05/19 07:26:18 guy Exp $ (LBL)";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include <pcap.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
|
|
#include "ip.h"
|
|
#ifdef INET6
|
|
#include "ip6.h"
|
|
#endif
|
|
|
|
/*
|
|
* The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
|
|
* 32-bit integer that specifies the family, e.g. AF_INET.
|
|
*
|
|
* Note here that "host" refers to the host on which the packets were
|
|
* captured; that isn't necessarily *this* host.
|
|
*
|
|
* The OpenBSD DLT_LOOP packet header is the same, except that the integer
|
|
* is in network byte order.
|
|
*/
|
|
#define NULL_HDRLEN 4
|
|
|
|
/*
|
|
* BSD AF_ values.
|
|
*
|
|
* Unfortunately, the BSDs don't all use the same value for AF_INET6,
|
|
* so, because we want to be able to read captures from all of the BSDs,
|
|
* we check for all of them.
|
|
*/
|
|
#define BSD_AF_INET 2
|
|
#define BSD_AF_NS 6 /* XEROX NS protocols */
|
|
#define BSD_AF_ISO 7
|
|
#define BSD_AF_APPLETALK 16
|
|
#define BSD_AF_IPX 23
|
|
#define BSD_AF_INET6_BSD 24 /* OpenBSD (and probably NetBSD), BSD/OS */
|
|
#define BSD_AF_INET6_FREEBSD 28
|
|
#define BSD_AF_INET6_DARWIN 30
|
|
|
|
const struct tok bsd_af_values[] = {
|
|
{ BSD_AF_INET, "IPv4" },
|
|
{ BSD_AF_NS, "NS" },
|
|
{ BSD_AF_ISO, "ISO" },
|
|
{ BSD_AF_APPLETALK, "Appletalk" },
|
|
{ BSD_AF_IPX, "IPX" },
|
|
{ BSD_AF_INET6_BSD, "IPv6" },
|
|
{ BSD_AF_INET6_FREEBSD, "IPv6" },
|
|
{ BSD_AF_INET6_DARWIN, "IPv6" },
|
|
{ 0, NULL}
|
|
};
|
|
|
|
|
|
/*
|
|
* Byte-swap a 32-bit number.
|
|
* ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
|
|
* big-endian platforms.)
|
|
*/
|
|
#define SWAPLONG(y) \
|
|
((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
|
|
|
|
static inline void
|
|
null_hdr_print(u_int family, u_int length)
|
|
{
|
|
if (!qflag) {
|
|
(void)printf("AF %s (%u)",
|
|
tok2str(bsd_af_values,"Unknown",family),family);
|
|
} else {
|
|
(void)printf("%s",
|
|
tok2str(bsd_af_values,"Unknown AF %u",family));
|
|
}
|
|
|
|
(void)printf(", length %u: ", length);
|
|
}
|
|
|
|
/*
|
|
* This is the top level routine of the printer. 'p' points
|
|
* to the ether header of the packet, 'h->ts' is the timestamp,
|
|
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
|
|
* is the number of bytes actually captured.
|
|
*/
|
|
u_int
|
|
null_if_print(const struct pcap_pkthdr *h, const u_char *p)
|
|
{
|
|
u_int length = h->len;
|
|
u_int caplen = h->caplen;
|
|
u_int family;
|
|
|
|
if (caplen < NULL_HDRLEN) {
|
|
printf("[|null]");
|
|
return (NULL_HDRLEN);
|
|
}
|
|
|
|
memcpy((char *)&family, (char *)p, sizeof(family));
|
|
|
|
/*
|
|
* This isn't necessarily in our host byte order; if this is
|
|
* a DLT_LOOP capture, it's in network byte order, and if
|
|
* this is a DLT_NULL capture from a machine with the opposite
|
|
* byte-order, it's in the opposite byte order from ours.
|
|
*
|
|
* If the upper 16 bits aren't all zero, assume it's byte-swapped.
|
|
*/
|
|
if ((family & 0xFFFF0000) != 0)
|
|
family = SWAPLONG(family);
|
|
|
|
if (eflag)
|
|
null_hdr_print(family, length);
|
|
|
|
length -= NULL_HDRLEN;
|
|
caplen -= NULL_HDRLEN;
|
|
p += NULL_HDRLEN;
|
|
|
|
switch (family) {
|
|
|
|
case BSD_AF_INET:
|
|
ip_print(gndo, p, length);
|
|
break;
|
|
|
|
#ifdef INET6
|
|
case BSD_AF_INET6_BSD:
|
|
case BSD_AF_INET6_FREEBSD:
|
|
case BSD_AF_INET6_DARWIN:
|
|
ip6_print(p, length);
|
|
break;
|
|
#endif
|
|
|
|
case BSD_AF_ISO:
|
|
isoclns_print(p, length, caplen);
|
|
break;
|
|
|
|
case BSD_AF_APPLETALK:
|
|
atalk_print(p, length);
|
|
break;
|
|
|
|
case BSD_AF_IPX:
|
|
ipx_print(p, length);
|
|
break;
|
|
|
|
default:
|
|
/* unknown AF_ value */
|
|
if (!eflag)
|
|
null_hdr_print(family, length + NULL_HDRLEN);
|
|
if (!xflag && !qflag)
|
|
default_print(p, caplen);
|
|
}
|
|
|
|
return (NULL_HDRLEN);
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|