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 #include <sys/cdefs.h> 23 #ifndef lint 24 #if 0 25 static const char rcsid[] _U_ = 26 "@(#) Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.20 2003-11-19 00:36:08 guy Exp"; 27 #else 28 __RCSID("$NetBSD: print-ipcomp.c,v 1.2 2010/12/05 05:11:30 christos Exp $"); 29 #endif 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <string.h> 37 #include <tcpdump-stdinc.h> 38 39 #include <stdio.h> 40 41 struct ipcomp { 42 u_int8_t comp_nxt; /* Next Header */ 43 u_int8_t comp_flags; /* Length of data, in 32bit */ 44 u_int16_t comp_cpi; /* Compression parameter index */ 45 }; 46 47 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 48 #include <zlib.h> 49 #endif 50 51 #include "interface.h" 52 #include "addrtoname.h" 53 #include "extract.h" 54 55 int 56 ipcomp_print(register const u_char *bp, int *nhdr _U_) 57 { 58 register const struct ipcomp *ipcomp; 59 register const u_char *ep; 60 u_int16_t cpi; 61 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 62 int advance; 63 #endif 64 65 ipcomp = (struct ipcomp *)bp; 66 cpi = EXTRACT_16BITS(&ipcomp->comp_cpi); 67 68 /* 'ep' points to the end of available data. */ 69 ep = snapend; 70 71 if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) { 72 fputs("[|IPCOMP]", stdout); 73 goto fail; 74 } 75 printf("IPComp(cpi=0x%04x)", cpi); 76 77 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 78 if (1) 79 goto fail; 80 81 /* 82 * We may want to decompress the packet here. Packet buffer 83 * management is a headache (if we decompress, packet will become 84 * larger). 85 */ 86 if (nhdr) 87 *nhdr = ipcomp->comp_nxt; 88 advance = sizeof(struct ipcomp); 89 90 printf(": "); 91 return advance; 92 93 #endif 94 fail: 95 return -1; 96 } 97