nexmon – Blame information for rev 1

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1 office 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 }