print-null.c revision 39300 
1/*
2 * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
3 *	The Regents of the University of California.  All rights reserved.
4 *
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
16 * written permission.
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.
20 */
21
22#ifndef lint
23static const char rcsid[] =
24    "@(#) $Header: print-null.c,v 1.24 97/05/28 12:52:47 leres Exp $ (LBL)";
25#endif
26
27#include <sys/param.h>
28#include <sys/time.h>
29#include <sys/socket.h>
30#include <sys/file.h>
31#include <sys/ioctl.h>
32
33#if __STDC__
34struct mbuf;
35struct rtentry;
36#endif
37#include <net/if.h>
38
39#include <netinet/in.h>
40#include <netinet/in_systm.h>
41#include <netinet/ip.h>
42#include <net/ethernet.h>
43#include <netinet/ip_var.h>
44#include <netinet/udp.h>
45#include <netinet/udp_var.h>
46#include <netinet/tcp.h>
47#include <netinet/tcpip.h>
48
49#include <pcap.h>
50#include <stdio.h>
51#include <string.h>
52
53#include "interface.h"
54#include "addrtoname.h"
55
56#ifndef AF_NS
57#define AF_NS		6		/* XEROX NS protocols */
58#endif
59
60/*
61 * The DLT_NULL packet header is 4 bytes long. It contains a network
62 * order 32 bit integer that specifies the family, e.g. AF_INET
63 */
64#define	NULL_HDRLEN 4
65
66static void
67null_print(const u_char *p, const struct ip *ip, u_int length)
68{
69	u_int family;
70
71	memcpy((char *)&family, (char *)p, sizeof(family));
72
73	if (nflag) {
74		/* XXX just dump the header */
75		return;
76	}
77	switch (family) {
78
79	case AF_INET:
80		printf("ip: ");
81		break;
82
83	case AF_NS:
84		printf("ns: ");
85		break;
86
87	default:
88		printf("AF %d: ", family);
89		break;
90	}
91}
92
93void
94null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
95{
96	u_int length = h->len;
97	u_int caplen = h->caplen;
98	const struct ip *ip;
99
100	ts_print(&h->ts);
101
102	/*
103	 * Some printers want to get back at the link level addresses,
104	 * and/or check that they're not walking off the end of the packet.
105	 * Rather than pass them all the way down, we set these globals.
106	 */
107	packetp = p;
108	snapend = p + caplen;
109
110	length -= NULL_HDRLEN;
111
112	ip = (struct ip *)(p + NULL_HDRLEN);
113
114	if (eflag)
115		null_print(p, ip, length);
116
117	ip_print((const u_char *)ip, length);
118
119	if (xflag)
120		default_print((const u_char *)ip, caplen - NULL_HDRLEN);
121	putchar('\n');
122}
123
124