xref: /minix3/external/bsd/tcpdump/dist/print-ipcomp.c (revision b636d99d91c3d54204248f643c14627405d4afd1)
1*b636d99dSDavid van Moolenbroek /*
2*b636d99dSDavid van Moolenbroek  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3*b636d99dSDavid van Moolenbroek  *	The Regents of the University of California.  All rights reserved.
4*b636d99dSDavid van Moolenbroek  *
5*b636d99dSDavid van Moolenbroek  * Redistribution and use in source and binary forms, with or without
6*b636d99dSDavid van Moolenbroek  * modification, are permitted provided that: (1) source code distributions
7*b636d99dSDavid van Moolenbroek  * retain the above copyright notice and this paragraph in its entirety, (2)
8*b636d99dSDavid van Moolenbroek  * distributions including binary code include the above copyright notice and
9*b636d99dSDavid van Moolenbroek  * this paragraph in its entirety in the documentation or other materials
10*b636d99dSDavid van Moolenbroek  * provided with the distribution, and (3) all advertising materials mentioning
11*b636d99dSDavid van Moolenbroek  * features or use of this software display the following acknowledgement:
12*b636d99dSDavid van Moolenbroek  * ``This product includes software developed by the University of California,
13*b636d99dSDavid van Moolenbroek  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14*b636d99dSDavid van Moolenbroek  * the University nor the names of its contributors may be used to endorse
15*b636d99dSDavid van Moolenbroek  * or promote products derived from this software without specific prior
16*b636d99dSDavid van Moolenbroek  * written permission.
17*b636d99dSDavid van Moolenbroek  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18*b636d99dSDavid van Moolenbroek  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19*b636d99dSDavid van Moolenbroek  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20*b636d99dSDavid van Moolenbroek  */
21*b636d99dSDavid van Moolenbroek 
22*b636d99dSDavid van Moolenbroek #include <sys/cdefs.h>
23*b636d99dSDavid van Moolenbroek #ifndef lint
24*b636d99dSDavid van Moolenbroek __RCSID("$NetBSD: print-ipcomp.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
25*b636d99dSDavid van Moolenbroek #endif
26*b636d99dSDavid van Moolenbroek 
27*b636d99dSDavid van Moolenbroek #define NETDISSECT_REWORKED
28*b636d99dSDavid van Moolenbroek #ifdef HAVE_CONFIG_H
29*b636d99dSDavid van Moolenbroek #include "config.h"
30*b636d99dSDavid van Moolenbroek #endif
31*b636d99dSDavid van Moolenbroek 
32*b636d99dSDavid van Moolenbroek #include <tcpdump-stdinc.h>
33*b636d99dSDavid van Moolenbroek 
34*b636d99dSDavid van Moolenbroek struct ipcomp {
35*b636d99dSDavid van Moolenbroek 	uint8_t comp_nxt;	/* Next Header */
36*b636d99dSDavid van Moolenbroek 	uint8_t comp_flags;	/* Length of data, in 32bit */
37*b636d99dSDavid van Moolenbroek 	uint16_t comp_cpi;	/* Compression parameter index */
38*b636d99dSDavid van Moolenbroek };
39*b636d99dSDavid van Moolenbroek 
40*b636d99dSDavid van Moolenbroek #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
41*b636d99dSDavid van Moolenbroek #include <zlib.h>
42*b636d99dSDavid van Moolenbroek #endif
43*b636d99dSDavid van Moolenbroek 
44*b636d99dSDavid van Moolenbroek #include "interface.h"
45*b636d99dSDavid van Moolenbroek #include "extract.h"
46*b636d99dSDavid van Moolenbroek 
47*b636d99dSDavid van Moolenbroek int
ipcomp_print(netdissect_options * ndo,register const u_char * bp,int * nhdr _U_)48*b636d99dSDavid van Moolenbroek ipcomp_print(netdissect_options *ndo, register const u_char *bp, int *nhdr _U_)
49*b636d99dSDavid van Moolenbroek {
50*b636d99dSDavid van Moolenbroek 	register const struct ipcomp *ipcomp;
51*b636d99dSDavid van Moolenbroek 	register const u_char *ep;
52*b636d99dSDavid van Moolenbroek 	uint16_t cpi;
53*b636d99dSDavid van Moolenbroek #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
54*b636d99dSDavid van Moolenbroek 	int advance;
55*b636d99dSDavid van Moolenbroek #endif
56*b636d99dSDavid van Moolenbroek 
57*b636d99dSDavid van Moolenbroek 	ipcomp = (struct ipcomp *)bp;
58*b636d99dSDavid van Moolenbroek 	cpi = EXTRACT_16BITS(&ipcomp->comp_cpi);
59*b636d99dSDavid van Moolenbroek 
60*b636d99dSDavid van Moolenbroek 	/* 'ep' points to the end of available data. */
61*b636d99dSDavid van Moolenbroek 	ep = ndo->ndo_snapend;
62*b636d99dSDavid van Moolenbroek 
63*b636d99dSDavid van Moolenbroek 	if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
64*b636d99dSDavid van Moolenbroek 		ND_PRINT((ndo, "[|IPCOMP]"));
65*b636d99dSDavid van Moolenbroek 		goto fail;
66*b636d99dSDavid van Moolenbroek 	}
67*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, "IPComp(cpi=0x%04x)", cpi));
68*b636d99dSDavid van Moolenbroek 
69*b636d99dSDavid van Moolenbroek #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
70*b636d99dSDavid van Moolenbroek 	if (1)
71*b636d99dSDavid van Moolenbroek 		goto fail;
72*b636d99dSDavid van Moolenbroek 
73*b636d99dSDavid van Moolenbroek 	/*
74*b636d99dSDavid van Moolenbroek 	 * We may want to decompress the packet here.  Packet buffer
75*b636d99dSDavid van Moolenbroek 	 * management is a headache (if we decompress, packet will become
76*b636d99dSDavid van Moolenbroek 	 * larger).
77*b636d99dSDavid van Moolenbroek 	 */
78*b636d99dSDavid van Moolenbroek 	if (nhdr)
79*b636d99dSDavid van Moolenbroek 		*nhdr = ipcomp->comp_nxt;
80*b636d99dSDavid van Moolenbroek 	advance = sizeof(struct ipcomp);
81*b636d99dSDavid van Moolenbroek 
82*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, ": "));
83*b636d99dSDavid van Moolenbroek 	return advance;
84*b636d99dSDavid van Moolenbroek 
85*b636d99dSDavid van Moolenbroek #endif
86*b636d99dSDavid van Moolenbroek fail:
87*b636d99dSDavid van Moolenbroek 	return -1;
88*b636d99dSDavid van Moolenbroek }
89