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 #ifndef lint 22 static const char rcsid[] _U_ = 23 "@(#) $Header: /tcpdump/master/tcpdump/print-symantec.c,v 1.4.2.1 2005/07/07 01:24:39 guy Exp $ (LBL)"; 24 #endif 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <tcpdump-stdinc.h> 31 32 #include <stdio.h> 33 #include <pcap.h> 34 35 #include "interface.h" 36 #include "addrtoname.h" 37 #include "ethertype.h" 38 39 #include "ether.h" 40 41 struct symantec_header { 42 u_int8_t stuff1[6]; 43 u_int16_t ether_type; 44 u_int8_t stuff2[36]; 45 }; 46 47 static inline void 48 symantec_hdr_print(register const u_char *bp, u_int length) 49 { 50 register const struct symantec_header *sp; 51 u_int16_t etype; 52 53 sp = (const struct symantec_header *)bp; 54 55 etype = ntohs(sp->ether_type); 56 if (!qflag) { 57 if (etype <= ETHERMTU) 58 (void)printf("invalid ethertype %u", etype); 59 else 60 (void)printf("ethertype %s (0x%04x)", 61 tok2str(ethertype_values,"Unknown", etype), 62 etype); 63 } else { 64 if (etype <= ETHERMTU) 65 (void)printf("invalid ethertype %u", etype); 66 else 67 (void)printf("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)); 68 } 69 70 (void)printf(", length %u: ", length); 71 } 72 73 /* 74 * This is the top level routine of the printer. 'p' points 75 * to the ether header of the packet, 'h->ts' is the timestamp, 76 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 77 * is the number of bytes actually captured. 78 */ 79 u_int 80 symantec_if_print(const struct pcap_pkthdr *h, const u_char *p) 81 { 82 u_int length = h->len; 83 u_int caplen = h->caplen; 84 struct symantec_header *sp; 85 u_short ether_type; 86 u_short extracted_ether_type; 87 88 if (caplen < sizeof (struct symantec_header)) { 89 printf("[|symantec]"); 90 return caplen; 91 } 92 93 if (eflag) 94 symantec_hdr_print(p, length); 95 96 length -= sizeof (struct symantec_header); 97 caplen -= sizeof (struct symantec_header); 98 sp = (struct symantec_header *)p; 99 p += sizeof (struct symantec_header); 100 101 ether_type = ntohs(sp->ether_type); 102 103 if (ether_type <= ETHERMTU) { 104 /* ether_type not known, print raw packet */ 105 if (!eflag) 106 symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header)); 107 108 if (!suppress_default_print) 109 default_print(p, caplen); 110 } else if (ether_encap_print(ether_type, p, length, caplen, 111 &extracted_ether_type) == 0) { 112 /* ether_type not known, print raw packet */ 113 if (!eflag) 114 symantec_hdr_print((u_char *)sp, length + sizeof (struct symantec_header)); 115 116 if (!suppress_default_print) 117 default_print(p, caplen); 118 } 119 120 return (sizeof (struct symantec_header)); 121 } 122