print-enc.c revision 1.4 
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 1.4 2014/11/20 03:05:03 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
80struct 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
92u_int
93enc_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 INET6
126	case AF_INET6:
127		ip6_print(ndo, p, length);
128		break;
129#endif /*INET6*/
130	}
131
132out:
133	return (ENC_HDRLEN);
134}
135
136
137/*
138 * Local Variables:
139 * c-style: whitesmith
140 * c-basic-offset: 8
141 * End:
142 */
143