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 #include <sys/cdefs.h>
25 #ifndef lint
26 __RCSID("$NetBSD: print-enc.c,v 1.5 2015/03/31 21:59:35 christos Exp $");
27 #endif
28
29 #define NETDISSECT_REWORKED
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include <tcpdump-stdinc.h>
35
36 #include "interface.h"
37 #include "extract.h"
38
39 /* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */
40 /*
41 * The authors of this code are John Ioannidis (ji@tla.org),
42 * Angelos D. Keromytis (kermit@csd.uch.gr) and
43 * Niels Provos (provos@physnet.uni-hamburg.de).
44 *
45 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
46 * in November 1995.
47 *
48 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
49 * by Angelos D. Keromytis.
50 *
51 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
52 * and Niels Provos.
53 *
54 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
55 * and Niels Provos.
56 * Copyright (c) 2001, Angelos D. Keromytis.
57 *
58 * Permission to use, copy, and modify this software with or without fee
59 * is hereby granted, provided that this entire notice is included in
60 * all copies of any software which is or includes a copy or
61 * modification of this software.
62 * You may use this code under the GNU public license if you so wish. Please
63 * contribute changes back to the authors under this freer than GPL license
64 * so that we may further the use of strong encryption without limitations to
65 * all.
66 *
67 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
68 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
69 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
70 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
71 * PURPOSE.
72 */
73
74 #define ENC_HDRLEN 12
75
76 /* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $ */
77 #define M_CONF 0x0400 /* packet was encrypted (ESP-transport) */
78 #define M_AUTH 0x0800 /* packet was authenticated (AH) */
79
80 struct enchdr {
81 uint32_t af;
82 uint32_t spi;
83 uint32_t flags;
84 };
85
86 #define ENC_PRINT_TYPE(wh, xf, nam) \
87 if ((wh) & (xf)) { \
88 ND_PRINT((ndo, "%s%s", nam, (wh) == (xf) ? "): " : ",")); \
89 (wh) &= ~(xf); \
90 }
91
92 u_int
enc_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,register const u_char * p)93 enc_if_print(netdissect_options *ndo,
94 const struct pcap_pkthdr *h, register const u_char *p)
95 {
96 register u_int length = h->len;
97 register u_int caplen = h->caplen;
98 int flags;
99 const struct enchdr *hdr;
100
101 if (caplen < ENC_HDRLEN) {
102 ND_PRINT((ndo, "[|enc]"));
103 goto out;
104 }
105
106 hdr = (struct enchdr *)p;
107 flags = hdr->flags;
108 if (flags == 0)
109 ND_PRINT((ndo, "(unprotected): "));
110 else
111 ND_PRINT((ndo, "("));
112 ENC_PRINT_TYPE(flags, M_AUTH, "authentic");
113 ENC_PRINT_TYPE(flags, M_CONF, "confidential");
114 /* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */
115 ND_PRINT((ndo, "SPI 0x%08x: ", EXTRACT_32BITS(&hdr->spi)));
116
117 length -= ENC_HDRLEN;
118 caplen -= ENC_HDRLEN;
119 p += ENC_HDRLEN;
120
121 switch (hdr->af) {
122 case AF_INET:
123 ip_print(ndo, p, length);
124 break;
125 #ifdef AF_INET6
126 case AF_INET6:
127 ip6_print(ndo, p, length);
128 break;
129 #endif
130 }
131
132 out:
133 return (ENC_HDRLEN);
134 }
135
136
137 /*
138 * Local Variables:
139 * c-style: whitesmith
140 * c-basic-offset: 8
141 * End:
142 */
143