/* * 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. */#ifndef lintstatic const char rcsid[] _U_ =    "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.57 2006-03-23 14:58:44 hannes 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#include "af.h"/* * 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/* * 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 voidnull_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_intnull_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_AFNUM_INET:		ip_print(gndo, p, length);		break;#ifdef INET6	case BSD_AFNUM_INET6_BSD:	case BSD_AFNUM_INET6_FREEBSD:	case BSD_AFNUM_INET6_DARWIN:		ip6_print(p, length);		break;#endif	case BSD_AFNUM_ISO:		isoclns_print(p, length, caplen);		break;	case BSD_AFNUM_APPLETALK:		atalk_print(p, length);		break;	case BSD_AFNUM_IPX:		ipx_print(p, length);		break;	default:		/* unknown AF_ value */		if (!eflag)			null_hdr_print(family, length + NULL_HDRLEN);		if (!suppress_default_print)			default_print(p, caplen);	}	return (NULL_HDRLEN);}/* * Local Variables: * c-style: whitesmith * c-basic-offset: 8 * End: */