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 #define NETDISSECT_REWORKED 23 #ifdef HAVE_CONFIG_H 24 #include "config.h" 25 #endif 26 27 #include <tcpdump-stdinc.h> 28 29 #include "interface.h" 30 #include "extract.h" 31 #include "ethertype.h" 32 33 #include "ether.h" 34 35 struct symantec_header { 36 uint8_t stuff1[6]; 37 uint16_t ether_type; 38 uint8_t stuff2[36]; 39 }; 40 41 static inline void 42 symantec_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length) 43 { 44 register const struct symantec_header *sp; 45 uint16_t etype; 46 47 sp = (const struct symantec_header *)bp; 48 49 etype = EXTRACT_16BITS(&sp->ether_type); 50 if (!ndo->ndo_qflag) { 51 if (etype <= ETHERMTU) 52 ND_PRINT((ndo, "invalid ethertype %u", etype)); 53 else 54 ND_PRINT((ndo, "ethertype %s (0x%04x)", 55 tok2str(ethertype_values,"Unknown", etype), 56 etype)); 57 } else { 58 if (etype <= ETHERMTU) 59 ND_PRINT((ndo, "invalid ethertype %u", etype)); 60 else 61 ND_PRINT((ndo, "%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype))); 62 } 63 64 ND_PRINT((ndo, ", length %u: ", length)); 65 } 66 67 /* 68 * This is the top level routine of the printer. 'p' points 69 * to the ether header of the packet, 'h->ts' is the timestamp, 70 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 71 * is the number of bytes actually captured. 72 */ 73 u_int 74 symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 75 { 76 u_int length = h->len; 77 u_int caplen = h->caplen; 78 struct symantec_header *sp; 79 u_short ether_type; 80 81 if (caplen < sizeof (struct symantec_header)) { 82 ND_PRINT((ndo, "[|symantec]")); 83 return caplen; 84 } 85 86 if (ndo->ndo_eflag) 87 symantec_hdr_print(ndo, p, length); 88 89 length -= sizeof (struct symantec_header); 90 caplen -= sizeof (struct symantec_header); 91 sp = (struct symantec_header *)p; 92 p += sizeof (struct symantec_header); 93 94 ether_type = EXTRACT_16BITS(&sp->ether_type); 95 96 if (ether_type <= ETHERMTU) { 97 /* ether_type not known, print raw packet */ 98 if (!ndo->ndo_eflag) 99 symantec_hdr_print(ndo, (u_char *)sp, length + sizeof (struct symantec_header)); 100 101 if (!ndo->ndo_suppress_default_print) 102 ND_DEFAULTPRINT(p, caplen); 103 } else if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) { 104 /* ether_type not known, print raw packet */ 105 if (!ndo->ndo_eflag) 106 symantec_hdr_print(ndo, (u_char *)sp, length + sizeof (struct symantec_header)); 107 108 if (!ndo->ndo_suppress_default_print) 109 ND_DEFAULTPRINT(p, caplen); 110 } 111 112 return (sizeof (struct symantec_header)); 113 } 114
