117680Spst/* 239300Sfenner * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997 317680Spst * The Regents of the University of California. All rights reserved. 417680Spst * 517680Spst * Redistribution and use in source and binary forms, with or without 617680Spst * modification, are permitted provided that: (1) source code distributions 717680Spst * retain the above copyright notice and this paragraph in its entirety, (2) 817680Spst * distributions including binary code include the above copyright notice and 917680Spst * this paragraph in its entirety in the documentation or other materials 1017680Spst * provided with the distribution, and (3) all advertising materials mentioning 1117680Spst * features or use of this software display the following acknowledgement: 1217680Spst * ``This product includes software developed by the University of California, 1317680Spst * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 1417680Spst * the University nor the names of its contributors may be used to endorse 1517680Spst * or promote products derived from this software without specific prior 1617680Spst * written permission. 1717680Spst * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 1817680Spst * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 1917680Spst * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 2056896Sfenner * 2156896Sfenner * $FreeBSD$ 2217680Spst */ 2317680Spst 2417680Spst#ifndef lint 25127675Sbmsstatic const char rcsid[] _U_ = 26190207Srpaulo "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.57 2006-03-23 14:58:44 hannes Exp $ (LBL)"; 2717680Spst#endif 2817680Spst 2956896Sfenner#ifdef HAVE_CONFIG_H 3056896Sfenner#include "config.h" 3156896Sfenner#endif 3256896Sfenner 33127675Sbms#include <tcpdump-stdinc.h> 3417680Spst 3526183Sfenner#include <pcap.h> 3617680Spst#include <stdio.h> 3717680Spst#include <string.h> 3817680Spst 3975118Sfenner#include "interface.h" 4075118Sfenner#include "addrtoname.h" 4175118Sfenner 4275118Sfenner#include "ip.h" 4356896Sfenner#ifdef INET6 4475118Sfenner#include "ip6.h" 4556896Sfenner#endif 46190207Srpaulo#include "af.h" 4756896Sfenner 4839300Sfenner/* 4975118Sfenner * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order 5075118Sfenner * 32-bit integer that specifies the family, e.g. AF_INET. 5175118Sfenner * 5275118Sfenner * Note here that "host" refers to the host on which the packets were 5375118Sfenner * captured; that isn't necessarily *this* host. 5475118Sfenner * 5575118Sfenner * The OpenBSD DLT_LOOP packet header is the same, except that the integer 5675118Sfenner * is in network byte order. 5739300Sfenner */ 5839300Sfenner#define NULL_HDRLEN 4 5939300Sfenner 6075118Sfenner/* 6175118Sfenner * Byte-swap a 32-bit number. 6275118Sfenner * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on 6375118Sfenner * big-endian platforms.) 6475118Sfenner */ 6575118Sfenner#define SWAPLONG(y) \ 6675118Sfenner((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) 6775118Sfenner 68147904Ssamstatic inline void 69147904Ssamnull_hdr_print(u_int family, u_int length) 70147904Ssam{ 71147904Ssam if (!qflag) { 72147904Ssam (void)printf("AF %s (%u)", 73147904Ssam tok2str(bsd_af_values,"Unknown",family),family); 74147904Ssam } else { 75147904Ssam (void)printf("%s", 76147904Ssam tok2str(bsd_af_values,"Unknown AF %u",family)); 77147904Ssam } 78147904Ssam 79147904Ssam (void)printf(", length %u: ", length); 80147904Ssam} 81147904Ssam 82127675Sbms/* 83127675Sbms * This is the top level routine of the printer. 'p' points 84127675Sbms * to the ether header of the packet, 'h->ts' is the timestamp, 85146778Ssam * 'h->len' is the length of the packet off the wire, and 'h->caplen' 86127675Sbms * is the number of bytes actually captured. 87127675Sbms */ 88127675Sbmsu_int 89127675Sbmsnull_if_print(const struct pcap_pkthdr *h, const u_char *p) 9017680Spst{ 9117680Spst u_int length = h->len; 9217680Spst u_int caplen = h->caplen; 9375118Sfenner u_int family; 9417680Spst 95127675Sbms if (caplen < NULL_HDRLEN) { 96127675Sbms printf("[|null]"); 97127675Sbms return (NULL_HDRLEN); 98127675Sbms } 9917680Spst 10075118Sfenner memcpy((char *)&family, (char *)p, sizeof(family)); 10175118Sfenner 10217680Spst /* 10375118Sfenner * This isn't necessarily in our host byte order; if this is 10475118Sfenner * a DLT_LOOP capture, it's in network byte order, and if 10575118Sfenner * this is a DLT_NULL capture from a machine with the opposite 10675118Sfenner * byte-order, it's in the opposite byte order from ours. 10775118Sfenner * 10875118Sfenner * If the upper 16 bits aren't all zero, assume it's byte-swapped. 10975118Sfenner */ 11075118Sfenner if ((family & 0xFFFF0000) != 0) 11175118Sfenner family = SWAPLONG(family); 11275118Sfenner 113147904Ssam if (eflag) 114147904Ssam null_hdr_print(family, length); 115147904Ssam 11617680Spst length -= NULL_HDRLEN; 117127675Sbms caplen -= NULL_HDRLEN; 118127675Sbms p += NULL_HDRLEN; 11917680Spst 120127675Sbms switch (family) { 121127675Sbms 122172686Smlaier case BSD_AFNUM_INET: 123147904Ssam ip_print(gndo, p, length); 12456896Sfenner break; 125127675Sbms 12656896Sfenner#ifdef INET6 127172686Smlaier case BSD_AFNUM_INET6_BSD: 128172686Smlaier case BSD_AFNUM_INET6_FREEBSD: 129172686Smlaier case BSD_AFNUM_INET6_DARWIN: 130235530Sdelphij ip6_print(gndo, p, length); 13156896Sfenner break; 132127675Sbms#endif 133127675Sbms 134172686Smlaier case BSD_AFNUM_ISO: 135127675Sbms isoclns_print(p, length, caplen); 136127675Sbms break; 137127675Sbms 138172686Smlaier case BSD_AFNUM_APPLETALK: 139127675Sbms atalk_print(p, length); 140127675Sbms break; 141127675Sbms 142172686Smlaier case BSD_AFNUM_IPX: 143127675Sbms ipx_print(p, length); 144127675Sbms break; 145127675Sbms 14656896Sfenner default: 147127675Sbms /* unknown AF_ value */ 148127675Sbms if (!eflag) 149147904Ssam null_hdr_print(family, length + NULL_HDRLEN); 150162021Ssam if (!suppress_default_print) 151127675Sbms default_print(p, caplen); 15256896Sfenner } 15317680Spst 154127675Sbms return (NULL_HDRLEN); 15517680Spst} 15617680Spst 157146778Ssam/* 158146778Ssam * Local Variables: 159146778Ssam * c-style: whitesmith 160146778Ssam * c-basic-offset: 8 161146778Ssam * End: 162146778Ssam */ 163