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 __RCSID("$NetBSD: print-ipcomp.c,v 1.4 2014/11/20 03:05:03 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 struct ipcomp { 35 uint8_t comp_nxt; /* Next Header */ 36 uint8_t comp_flags; /* Length of data, in 32bit */ 37 uint16_t comp_cpi; /* Compression parameter index */ 38 }; 39 40 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 41 #include <zlib.h> 42 #endif 43 44 #include "interface.h" 45 #include "extract.h" 46 47 int 48 ipcomp_print(netdissect_options *ndo, register const u_char *bp, int *nhdr _U_) 49 { 50 register const struct ipcomp *ipcomp; 51 register const u_char *ep; 52 uint16_t cpi; 53 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 54 int advance; 55 #endif 56 57 ipcomp = (struct ipcomp *)bp; 58 cpi = EXTRACT_16BITS(&ipcomp->comp_cpi); 59 60 /* 'ep' points to the end of available data. */ 61 ep = ndo->ndo_snapend; 62 63 if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) { 64 ND_PRINT((ndo, "[|IPCOMP]")); 65 goto fail; 66 } 67 ND_PRINT((ndo, "IPComp(cpi=0x%04x)", cpi)); 68 69 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 70 if (1) 71 goto fail; 72 73 /* 74 * We may want to decompress the packet here. Packet buffer 75 * management is a headache (if we decompress, packet will become 76 * larger). 77 */ 78 if (nhdr) 79 *nhdr = ipcomp->comp_nxt; 80 advance = sizeof(struct ipcomp); 81 82 ND_PRINT((ndo, ": ")); 83 return advance; 84 85 #endif 86 fail: 87 return -1; 88 } 89