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 1.7 2023/08/17 20:19:40 christos Exp $"); 25 #endif 26 27 /* \summary: Symantec Enterprise Firewall printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include <config.h> 31 #endif 32 33 #include "netdissect-stdinc.h" 34 35 #define ND_LONGJMP_FROM_TCHECK 36 #include "netdissect.h" 37 #include "extract.h" 38 #include "ethertype.h" 39 40 struct symantec_header { 41 nd_byte stuff1[6]; 42 nd_uint16_t ether_type; 43 nd_byte stuff2[36]; 44 }; 45 46 static void 47 symantec_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length) 48 { 49 const struct symantec_header *sp; 50 uint16_t etype; 51 52 sp = (const struct symantec_header *)bp; 53 54 etype = GET_BE_U_2(sp->ether_type); 55 if (!ndo->ndo_qflag) { 56 if (etype <= MAX_ETHERNET_LENGTH_VAL) 57 ND_PRINT("invalid ethertype %u", etype); 58 else 59 ND_PRINT("ethertype %s (0x%04x)", 60 tok2str(ethertype_values,"Unknown", etype), 61 etype); 62 } else { 63 if (etype <= MAX_ETHERNET_LENGTH_VAL) 64 ND_PRINT("invalid ethertype %u", etype); 65 else 66 ND_PRINT("%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)); 67 } 68 69 ND_PRINT(", 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 void 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 const struct symantec_header *sp; 84 u_short ether_type; 85 86 ndo->ndo_protocol = "symantec"; 87 ND_TCHECK_LEN(p, sizeof(struct symantec_header)); 88 89 ndo->ndo_ll_hdr_len += sizeof (struct symantec_header); 90 if (ndo->ndo_eflag) 91 symantec_hdr_print(ndo, p, length); 92 93 length -= sizeof (struct symantec_header); 94 caplen -= sizeof (struct symantec_header); 95 sp = (const struct symantec_header *)p; 96 p += sizeof (struct symantec_header); 97 98 ether_type = GET_BE_U_2(sp->ether_type); 99 100 if (ether_type <= MAX_ETHERNET_LENGTH_VAL) { 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 } else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) { 108 /* ether_type not known, print raw packet */ 109 if (!ndo->ndo_eflag) 110 symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header)); 111 112 if (!ndo->ndo_suppress_default_print) 113 ND_DEFAULTPRINT(p, caplen); 114 } 115 } 116