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 23 static 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 36 struct 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 50 int 51 ipcomp_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 89 fail: 90 return -1; 91 } 92