print-ipcomp.c revision 56893 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
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: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.2.2.2 2000/01/25 18:31:10 itojun Exp $";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <string.h>
32#include <sys/param.h>
33#include <sys/time.h>
34#include <sys/types.h>
35#include <sys/socket.h>
36
37#include <net/route.h>
38#include <net/if.h>
39
40#include <netinet/in.h>
41#include <netinet/if_ether.h>
42#include <netinet/in_systm.h>
43#include <netinet/ip.h>
44#include <netinet/ip_icmp.h>
45#include <netinet/ip_var.h>
46#include <netinet/udp.h>
47#include <netinet/udp_var.h>
48#include <netinet/tcp.h>
49
50#include <stdio.h>
51
52#ifdef INET6
53#include <netinet/ip6.h>
54#endif
55
56struct ipcomp {
57	u_int8_t comp_nxt;	/* Next Header */
58	u_int8_t comp_flags;	/* Length of data, in 32bit */
59	u_int16_t comp_cpi;	/* Compression parameter index */
60};
61
62#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
63#include <zlib.h>
64#endif
65
66#include "interface.h"
67#include "addrtoname.h"
68
69int
70ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr)
71{
72	register const struct ipcomp *ipcomp;
73	register const u_char *ep;
74	u_int16_t cpi;
75#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
76	int advance;
77#endif
78
79	ipcomp = (struct ipcomp *)bp;
80	cpi = (u_int16_t)ntohs(ipcomp->comp_cpi);
81
82	/* 'ep' points to the end of avaible data. */
83	ep = snapend;
84
85	if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
86		fputs("[|IPCOMP]", stdout);
87		goto fail;
88	}
89	printf("IPComp(cpi=%u)", cpi);
90
91#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
92	if (1)
93		goto fail;
94
95	/*
96	 * We may want to decompress the packet here.  Packet buffer
97	 * management is a headache (if we decompress, packet will become
98	 * larger).
99	 */
100	if (nhdr)
101		*nhdr = ipcomp->comp_nxt;
102	advance = sizeof(struct ipcomp);
103
104	printf(": ");
105	return advance;
106
107#endif
108fail:
109	if (nhdr)
110		*nhdr = -1;
111	return 65536;
112}
113