Move tcpdump-3.9/ to tcpdump/. No need for a versioned dir.
[dragonfly.git] / contrib / tcpdump / print-ipcomp.c
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c8cf0f94
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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[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.20 2003/11/19 00:36:08 guy Exp $";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <string.h>
32#include <tcpdump-stdinc.h>
33
34#include <stdio.h>
35
36struct ipcomp {
37 u_int8_t comp_nxt; /* Next Header */
38 u_int8_t comp_flags; /* Length of data, in 32bit */
39 u_int16_t comp_cpi; /* Compression parameter index */
40};
41
42#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
43#include <zlib.h>
44#endif
45
46#include "interface.h"
47#include "addrtoname.h"
48#include "extract.h"
49
50int
51ipcomp_print(register const u_char *bp, int *nhdr _U_)
52{
53 register const struct ipcomp *ipcomp;
54 register const u_char *ep;
55 u_int16_t cpi;
56#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
57 int advance;
58#endif
59
60 ipcomp = (struct ipcomp *)bp;
61 cpi = EXTRACT_16BITS(&ipcomp->comp_cpi);
62
63 /* 'ep' points to the end of available data. */
64 ep = snapend;
65
66 if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
67 fputs("[|IPCOMP]", stdout);
68 goto fail;
69 }
70 printf("IPComp(cpi=0x%04x)", cpi);
71
72#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
73 if (1)
74 goto fail;
75
76 /*
77 * We may want to decompress the packet here. Packet buffer
78 * management is a headache (if we decompress, packet will become
79 * larger).
80 */
81 if (nhdr)
82 *nhdr = ipcomp->comp_nxt;
83 advance = sizeof(struct ipcomp);
84
85 printf(": ");
86 return advance;
87
88#endif
89fail:
90 return -1;
91}