166 lines
4.0 KiB
C
166 lines
4.0 KiB
C
/*
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* Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.41.4.1 2002/06/01 23:51:15 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <pcap.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ip.h"
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#ifdef INET6
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#include "ip6.h"
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#endif
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#ifndef AF_NS
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#define AF_NS 6 /* XEROX NS protocols */
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#endif
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/*
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* The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
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* 32-bit integer that specifies the family, e.g. AF_INET.
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*
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* Note here that "host" refers to the host on which the packets were
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* captured; that isn't necessarily *this* host.
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*
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* The OpenBSD DLT_LOOP packet header is the same, except that the integer
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* is in network byte order.
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*/
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#define NULL_HDRLEN 4
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static void
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null_print(u_int family, u_int length)
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{
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if (nflag)
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printf("AF %u ", family);
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else {
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switch (family) {
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case AF_INET:
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printf("ip ");
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break;
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#ifdef INET6
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case AF_INET6:
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printf("ip6 ");
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break;
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#endif
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case AF_NS:
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printf("ns ");
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break;
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default:
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printf("AF %u ", family);
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break;
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}
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}
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printf("%d: ", length);
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}
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/*
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* Byte-swap a 32-bit number.
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* ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
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* big-endian platforms.)
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*/
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#define SWAPLONG(y) \
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((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
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void
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null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
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{
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u_int length = h->len;
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u_int caplen = h->caplen;
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const struct ip *ip;
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u_int family;
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++infodelay;
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ts_print(&h->ts);
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memcpy((char *)&family, (char *)p, sizeof(family));
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/*
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* This isn't necessarily in our host byte order; if this is
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* a DLT_LOOP capture, it's in network byte order, and if
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* this is a DLT_NULL capture from a machine with the opposite
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* byte-order, it's in the opposite byte order from ours.
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*
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* If the upper 16 bits aren't all zero, assume it's byte-swapped.
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*/
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if ((family & 0xFFFF0000) != 0)
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family = SWAPLONG(family);
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/*
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* Some printers want to get back at the link level addresses,
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* and/or check that they're not walking off the end of the packet.
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* Rather than pass them all the way down, we set these globals.
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*/
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packetp = p;
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snapend = p + caplen;
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length -= NULL_HDRLEN;
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ip = (struct ip *)(p + NULL_HDRLEN);
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if (eflag)
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null_print(family, length);
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switch (IP_V(ip)) {
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case 4:
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ip_print((const u_char *)ip, length);
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break;
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#ifdef INET6
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case 6:
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ip6_print((const u_char *)ip, length);
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break;
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#endif /* INET6 */
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default:
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printf("ip v%d", IP_V(ip));
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break;
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}
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if (xflag)
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default_print((const u_char *)ip, caplen - NULL_HDRLEN);
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putchar('\n');
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--infodelay;
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if (infoprint)
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info(0);
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}
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