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 /* \summary: Symantec Enterprise Firewall printer */ 23 24 #include <config.h> 25 26 #include "netdissect-stdinc.h" 27 28 #define ND_LONGJMP_FROM_TCHECK 29 #include "netdissect.h" 30 #include "extract.h" 31 #include "ethertype.h" 32 33 struct symantec_header { 34 nd_byte stuff1[6]; 35 nd_uint16_t ether_type; 36 nd_byte stuff2[36]; 37 }; 38 39 static void 40 symantec_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length) 41 { 42 const struct symantec_header *sp; 43 uint16_t etype; 44 45 sp = (const struct symantec_header *)bp; 46 47 etype = GET_BE_U_2(sp->ether_type); 48 if (!ndo->ndo_qflag) { 49 if (etype <= MAX_ETHERNET_LENGTH_VAL) 50 ND_PRINT("invalid ethertype %u", etype); 51 else 52 ND_PRINT("ethertype %s (0x%04x)", 53 tok2str(ethertype_values,"Unknown", etype), 54 etype); 55 } else { 56 if (etype <= MAX_ETHERNET_LENGTH_VAL) 57 ND_PRINT("invalid ethertype %u", etype); 58 else 59 ND_PRINT("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)); 60 } 61 62 ND_PRINT(", length %u: ", length); 63 } 64 65 /* 66 * This is the top level routine of the printer. 'p' points 67 * to the ether header of the packet, 'h->ts' is the timestamp, 68 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 69 * is the number of bytes actually captured. 70 */ 71 void 72 symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 73 { 74 u_int length = h->len; 75 u_int caplen = h->caplen; 76 const struct symantec_header *sp; 77 u_short ether_type; 78 79 ndo->ndo_protocol = "symantec"; 80 ND_TCHECK_LEN(p, sizeof(struct symantec_header)); 81 82 ndo->ndo_ll_hdr_len += sizeof (struct symantec_header); 83 if (ndo->ndo_eflag) 84 symantec_hdr_print(ndo, p, length); 85 86 length -= sizeof (struct symantec_header); 87 caplen -= sizeof (struct symantec_header); 88 sp = (const struct symantec_header *)p; 89 p += sizeof (struct symantec_header); 90 91 ether_type = GET_BE_U_2(sp->ether_type); 92 93 if (ether_type <= MAX_ETHERNET_LENGTH_VAL) { 94 /* ether_type not known, print raw packet */ 95 if (!ndo->ndo_eflag) 96 symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header)); 97 98 if (!ndo->ndo_suppress_default_print) 99 ND_DEFAULTPRINT(p, caplen); 100 } else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) { 101 /* ether_type not known, print raw packet */ 102 if (!ndo->ndo_eflag) 103 symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header)); 104 105 if (!ndo->ndo_suppress_default_print) 106 ND_DEFAULTPRINT(p, caplen); 107 } 108 } 109