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 1.5 2017/01/24 23:29:14 christos Exp $"); 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <netdissect-stdinc.h> 32 33 struct ipcomp { 34 uint8_t comp_nxt; /* Next Header */ 35 uint8_t comp_flags; /* Length of data, in 32bit */ 36 uint16_t comp_cpi; /* Compression parameter index */ 37 }; 38 39 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 40 #include <zlib.h> 41 #endif 42 43 #include "netdissect.h" 44 #include "extract.h" 45 46 int 47 ipcomp_print(netdissect_options *ndo, register const u_char *bp, int *nhdr _U_) 48 { 49 register const struct ipcomp *ipcomp; 50 register const u_char *ep; 51 uint16_t cpi; 52 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 53 int advance; 54 #endif 55 56 ipcomp = (const struct ipcomp *)bp; 57 cpi = EXTRACT_16BITS(&ipcomp->comp_cpi); 58 59 /* 'ep' points to the end of available data. */ 60 ep = ndo->ndo_snapend; 61 62 if ((const u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) { 63 ND_PRINT((ndo, "[|IPCOMP]")); 64 goto fail; 65 } 66 ND_PRINT((ndo, "IPComp(cpi=0x%04x)", cpi)); 67 68 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 69 if (1) 70 goto fail; 71 72 /* 73 * We may want to decompress the packet here. Packet buffer 74 * management is a headache (if we decompress, packet will become 75 * larger). 76 */ 77 if (nhdr) 78 *nhdr = ipcomp->comp_nxt; 79 advance = sizeof(struct ipcomp); 80 81 ND_PRINT((ndo, ": ")); 82 return advance; 83 84 #endif 85 fail: 86 return -1; 87 } 88