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