Home | History | Annotate | Line # | Download | only in dist
print-enc.c revision 1.7 
      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 1.7 2017/02/05 04:05:05 spz Exp $");
     27 #endif
     28 
     29 /* \summary: OpenBSD IPsec encapsulation BPF layer printer */
     30 
     31 #ifdef HAVE_CONFIG_H
     32 #include "config.h"
     33 #endif
     34 
     35 #include <netdissect-stdinc.h>
     36 
     37 #include "netdissect.h"
     38 #include "extract.h"
     39 
     40 /* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */
     41 /*
     42  * The authors of this code are John Ioannidis (ji (at) tla.org),
     43  * Angelos D. Keromytis (kermit (at) csd.uch.gr) and
     44  * Niels Provos (provos (at) physnet.uni-hamburg.de).
     45  *
     46  * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
     47  * in November 1995.
     48  *
     49  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
     50  * by Angelos D. Keromytis.
     51  *
     52  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
     53  * and Niels Provos.
     54  *
     55  * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
     56  * and Niels Provos.
     57  * Copyright (c) 2001, Angelos D. Keromytis.
     58  *
     59  * Permission to use, copy, and modify this software with or without fee
     60  * is hereby granted, provided that this entire notice is included in
     61  * all copies of any software which is or includes a copy or
     62  * modification of this software.
     63  * You may use this code under the GNU public license if you so wish. Please
     64  * contribute changes back to the authors under this freer than GPL license
     65  * so that we may further the use of strong encryption without limitations to
     66  * all.
     67  *
     68  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
     69  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
     70  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
     71  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
     72  * PURPOSE.
     73  */
     74 
     75 #define ENC_HDRLEN	12
     76 
     77 /* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $	*/
     78 #define M_CONF		0x0400  /* packet was encrypted (ESP-transport) */
     79 #define M_AUTH		0x0800  /* packet was authenticated (AH) */
     80 
     81 struct enchdr {
     82 	uint32_t af;
     83 	uint32_t spi;
     84 	uint32_t flags;
     85 };
     86 
     87 #define ENC_PRINT_TYPE(wh, xf, nam) \
     88 	if ((wh) & (xf)) { \
     89 		ND_PRINT((ndo, "%s%s", nam, (wh) == (xf) ? "): " : ",")); \
     90 		(wh) &= ~(xf); \
     91 	}
     92 
     93 u_int
     94 enc_if_print(netdissect_options *ndo,
     95              const struct pcap_pkthdr *h, register const u_char *p)
     96 {
     97 	register u_int length = h->len;
     98 	register u_int caplen = h->caplen;
     99 	int flags;
    100 	const struct enchdr *hdr;
    101 
    102 	if (caplen < ENC_HDRLEN) {
    103 		ND_PRINT((ndo, "[|enc]"));
    104 		goto out;
    105 	}
    106 
    107 	hdr = (const struct enchdr *)p;
    108 	flags = hdr->flags;
    109 	if (flags == 0)
    110 		ND_PRINT((ndo, "(unprotected): "));
    111 	else
    112 		ND_PRINT((ndo, "("));
    113 	ENC_PRINT_TYPE(flags, M_AUTH, "authentic");
    114 	ENC_PRINT_TYPE(flags, M_CONF, "confidential");
    115 	/* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */
    116 	ND_PRINT((ndo, "SPI 0x%08x: ", EXTRACT_32BITS(&hdr->spi)));
    117 
    118 	length -= ENC_HDRLEN;
    119 	caplen -= ENC_HDRLEN;
    120 	p += ENC_HDRLEN;
    121 
    122 	switch (hdr->af) {
    123 	case AF_INET:
    124 		ip_print(ndo, p, length);
    125 		break;
    126 #ifdef AF_INET6
    127 	case AF_INET6:
    128 		ip6_print(ndo, p, length);
    129 		break;
    130 #endif
    131 	}
    132 
    133 out:
    134 	return (ENC_HDRLEN);
    135 }
    136 
    137 
    138 /*
    139  * Local Variables:
    140  * c-style: whitesmith
    141  * c-basic-offset: 8
    142  * End:
    143  */
    144