external/bsd/tcpdump/dist/print-enc.c

   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
  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  */