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1 office 1 /* $OpenBSD: print-enc.c,v 1.7 2002/02/19 19:39:40 millert Exp $ */
2  
3 /*
4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
18 * written permission.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 */
23  
24 #define NETDISSECT_REWORKED
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28  
29 #include <tcpdump-stdinc.h>
30  
31 #include "interface.h"
32 #include "extract.h"
33  
34 /* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */
35 /*
36 * The authors of this code are John Ioannidis (ji@tla.org),
37 * Angelos D. Keromytis (kermit@csd.uch.gr) and
38 * Niels Provos (provos@physnet.uni-hamburg.de).
39 *
40 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
41 * in November 1995.
42 *
43 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
44 * by Angelos D. Keromytis.
45 *
46 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
47 * and Niels Provos.
48 *
49 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
50 * and Niels Provos.
51 * Copyright (c) 2001, Angelos D. Keromytis.
52 *
53 * Permission to use, copy, and modify this software with or without fee
54 * is hereby granted, provided that this entire notice is included in
55 * all copies of any software which is or includes a copy or
56 * modification of this software.
57 * You may use this code under the GNU public license if you so wish. Please
58 * contribute changes back to the authors under this freer than GPL license
59 * so that we may further the use of strong encryption without limitations to
60 * all.
61 *
62 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
63 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
64 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
65 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
66 * PURPOSE.
67 */
68  
69 #define ENC_HDRLEN 12
70  
71 /* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $ */
72 #define M_CONF 0x0400 /* packet was encrypted (ESP-transport) */
73 #define M_AUTH 0x0800 /* packet was authenticated (AH) */
74  
75 struct enchdr {
76 uint32_t af;
77 uint32_t spi;
78 uint32_t flags;
79 };
80  
81 #define ENC_PRINT_TYPE(wh, xf, nam) \
82 if ((wh) & (xf)) { \
83 ND_PRINT((ndo, "%s%s", nam, (wh) == (xf) ? "): " : ",")); \
84 (wh) &= ~(xf); \
85 }
86  
87 u_int
88 enc_if_print(netdissect_options *ndo,
89 const struct pcap_pkthdr *h, register const u_char *p)
90 {
91 register u_int length = h->len;
92 register u_int caplen = h->caplen;
93 int flags;
94 const struct enchdr *hdr;
95  
96 if (caplen < ENC_HDRLEN) {
97 ND_PRINT((ndo, "[|enc]"));
98 goto out;
99 }
100  
101 hdr = (struct enchdr *)p;
102 flags = hdr->flags;
103 if (flags == 0)
104 ND_PRINT((ndo, "(unprotected): "));
105 else
106 ND_PRINT((ndo, "("));
107 ENC_PRINT_TYPE(flags, M_AUTH, "authentic");
108 ENC_PRINT_TYPE(flags, M_CONF, "confidential");
109 /* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */
110 ND_PRINT((ndo, "SPI 0x%08x: ", EXTRACT_32BITS(&hdr->spi)));
111  
112 length -= ENC_HDRLEN;
113 caplen -= ENC_HDRLEN;
114 p += ENC_HDRLEN;
115  
116 switch (hdr->af) {
117 case AF_INET:
118 ip_print(ndo, p, length);
119 break;
120 #ifdef AF_INET6
121 case AF_INET6:
122 ip6_print(ndo, p, length);
123 break;
124 #endif
125 }
126  
127 out:
128 return (ENC_HDRLEN);
129 }
130  
131  
132 /*
133 * Local Variables:
134 * c-style: whitesmith
135 * c-basic-offset: 8
136 * End:
137 */