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76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: IPSEC Authentication Header printer */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#include "netdissect.h"
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#include "extract.h"
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#include "ah.h"
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int
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ah_print(netdissect_options *ndo, const u_char *bp)
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{
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const struct ah *ah;
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uint8_t ah_len;
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u_int ah_hdr_len;
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uint16_t reserved;
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const u_char *p;
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ndo->ndo_protocol = "ah";
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ah = (const struct ah *)bp;
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nd_print_protocol_caps(ndo);
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/*
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* RFC4302
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*
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* 2.2. Payload Length
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*
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* This 8-bit field specifies the length of AH in 32-bit words (4-byte
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* units), minus "2".
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*/
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ah_len = GET_U_1(ah->ah_len);
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ah_hdr_len = (ah_len + 2) * 4;
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ND_PRINT("(");
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if (ndo->ndo_vflag)
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ND_PRINT("length=%u(%u-bytes),", ah_len, ah_hdr_len);
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reserved = GET_BE_U_2(ah->ah_reserved);
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if (reserved)
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ND_PRINT("reserved=0x%x[MustBeZero],", reserved);
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ND_PRINT("spi=0x%08x,", GET_BE_U_4(ah->ah_spi));
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ND_PRINT("seq=0x%x,", GET_BE_U_4(ah->ah_seq));
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ND_PRINT("icv=0x");
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for (p = (const u_char *)(ah + 1); p < bp + ah_hdr_len; p++)
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ND_PRINT("%02x", GET_U_1(p));
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ND_PRINT("): ");
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return ah_hdr_len;
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}
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