1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 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-symantec.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 #include "interface.h" 35 #include "extract.h" 36 #include "ethertype.h" 37 38 #include "ether.h" 39 40 struct symantec_header { 41 uint8_t stuff1[6]; 42 uint16_t ether_type; 43 uint8_t stuff2[36]; 44 }; 45 46 static inline void 47 symantec_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length) 48 { 49 register const struct symantec_header *sp; 50 uint16_t etype; 51 52 sp = (const struct symantec_header *)bp; 53 54 etype = EXTRACT_16BITS(&sp->ether_type); 55 if (!ndo->ndo_qflag) { 56 if (etype <= ETHERMTU) 57 ND_PRINT((ndo, "invalid ethertype %u", etype)); 58 else 59 ND_PRINT((ndo, "ethertype %s (0x%04x)", 60 tok2str(ethertype_values,"Unknown", etype), 61 etype)); 62 } else { 63 if (etype <= ETHERMTU) 64 ND_PRINT((ndo, "invalid ethertype %u", etype)); 65 else 66 ND_PRINT((ndo, "%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype))); 67 } 68 69 ND_PRINT((ndo, ", length %u: ", length)); 70 } 71 72 /* 73 * This is the top level routine of the printer. 'p' points 74 * to the ether header of the packet, 'h->ts' is the timestamp, 75 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 76 * is the number of bytes actually captured. 77 */ 78 u_int 79 symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 80 { 81 u_int length = h->len; 82 u_int caplen = h->caplen; 83 struct symantec_header *sp; 84 u_short ether_type; 85 86 if (caplen < sizeof (struct symantec_header)) { 87 ND_PRINT((ndo, "[|symantec]")); 88 return caplen; 89 } 90 91 if (ndo->ndo_eflag) 92 symantec_hdr_print(ndo, p, length); 93 94 length -= sizeof (struct symantec_header); 95 caplen -= sizeof (struct symantec_header); 96 sp = (struct symantec_header *)p; 97 p += sizeof (struct symantec_header); 98 99 ether_type = EXTRACT_16BITS(&sp->ether_type); 100 101 if (ether_type <= ETHERMTU) { 102 /* ether_type not known, print raw packet */ 103 if (!ndo->ndo_eflag) 104 symantec_hdr_print(ndo, (u_char *)sp, length + sizeof (struct symantec_header)); 105 106 if (!ndo->ndo_suppress_default_print) 107 ND_DEFAULTPRINT(p, caplen); 108 } else if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) { 109 /* ether_type not known, print raw packet */ 110 if (!ndo->ndo_eflag) 111 symantec_hdr_print(ndo, (u_char *)sp, length + sizeof (struct symantec_header)); 112 113 if (!ndo->ndo_suppress_default_print) 114 ND_DEFAULTPRINT(p, caplen); 115 } 116 117 return (sizeof (struct symantec_header)); 118 } 119