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[] = 24 "@(#) $Header: /tcpdump/master/tcpdump/print-ipcomp.c,v 1.13 2000/12/12 09:58:41 itojun Exp $"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <string.h> 32 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 37 #include <netinet/in.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 54 int 55 ipcomp_print(register const u_char *bp, register const u_char *bp2, int *nhdr) 56 { 57 register const struct ipcomp *ipcomp; 58 register const u_char *ep; 59 u_int16_t cpi; 60 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 61 int advance; 62 #endif 63 64 ipcomp = (struct ipcomp *)bp; 65 cpi = (u_int16_t)ntohs(ipcomp->comp_cpi); 66 67 /* 'ep' points to the end of available data. */ 68 ep = snapend; 69 70 if ((u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) { 71 fputs("[|IPCOMP]", stdout); 72 goto fail; 73 } 74 printf("IPComp(cpi=0x%04x)", cpi); 75 76 #if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H) 77 if (1) 78 goto fail; 79 80 /* 81 * We may want to decompress the packet here. Packet buffer 82 * management is a headache (if we decompress, packet will become 83 * larger). 84 */ 85 if (nhdr) 86 *nhdr = ipcomp->comp_nxt; 87 advance = sizeof(struct ipcomp); 88 89 printf(": "); 90 return advance; 91 92 #endif 93 fail: 94 if (nhdr) 95 *nhdr = -1; 96 return 65536; 97 } 98