/*
 * Copyright (c) 1993, 1994 Jeffrey C. Mogul, Digital Equipment Corporation,
 * Western Research Laboratory. All rights reserved.
 * Copyright (c) 2001 Compaq Computer Corporation. All rights reserved.
 *
 *  Permission to use, copy, and modify this software and its
 *  documentation is hereby granted only under the following terms and
 *  conditions.  Both the above copyright notice and this permission
 *  notice must appear in all copies of the software, derivative works
 *  or modified versions, and any portions thereof, and both notices
 *  must appear in supporting documentation.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *    1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
 *  DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 *  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.   IN NO
 *  EVENT SHALL COMPAQ COMPUTER CORPORATION BE LIABLE FOR ANY
 *  SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 *  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 *  OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 *  SOFTWARE.
 */

/*
 * parsenfsfh.c - portable parser for NFS file handles
 *			uses all sorts of heuristics
 *
 * Jeffrey C. Mogul
 * Digital Equipment Corporation
 * Western Research Laboratory
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "netdissect-stdinc.h"

#include <stdio.h>
#include <string.h>

#include "netdissect.h"
#include "nfsfh.h"

/*
 * This routine attempts to parse a file handle (in network byte order),
 * using heuristics to guess what kind of format it is in.  See the
 * file "fhandle_layouts" for a detailed description of the various
 * patterns we know about.
 *
 * The file handle is parsed into our internal representation of a
 * file-system id, and an internal representation of an inode-number.
 */

#define	FHT_UNKNOWN	0
#define	FHT_AUSPEX	1
#define	FHT_DECOSF	2
#define	FHT_IRIX4	3
#define	FHT_IRIX5	4
#define	FHT_SUNOS3	5
#define	FHT_SUNOS4	6
#define	FHT_ULTRIX	7
#define	FHT_VMSUCX	8
#define	FHT_SUNOS5	9
#define	FHT_AIX32	10
#define	FHT_HPUX9	11
#define	FHT_BSD44	12

#ifdef	ultrix
/* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
#define	XFF(x)	((uint32_t)(x))
#else
#define	XFF(x)	(x)
#endif

#define	make_uint32(msb,b,c,lsb)\
	(XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))

#define	make_uint24(msb,b, lsb)\
	(XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))

#define	make_uint16(msb,lsb)\
	(XFF(lsb) + (XFF(msb)<<8))

static int is_UCX(const unsigned char *, u_int);

void
Parse_fh(const unsigned char *fh, u_int len, my_fsid *fsidp,
	 uint32_t *inop,
	 const char **osnamep, /* if non-NULL, return OS name here */
	 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
	 int ourself)	/* true if file handle was generated on this host */
{
	const unsigned char *fhp = fh;
	uint32_t temp;
	int fhtype = FHT_UNKNOWN;
	u_int i;

	/*
	 * Require at least 16 bytes of file handle; it's variable-length
	 * in NFSv3.  "len" is in units of 32-bit words, not bytes.
	 */
	if (len < 16/4)
		fhtype = FHT_UNKNOWN;
	else {
		if (ourself) {
		    /* File handle generated on this host, no need for guessing */
#if	defined(IRIX40)
		    fhtype = FHT_IRIX4;
#endif
#if	defined(IRIX50)
		    fhtype = FHT_IRIX5;
#endif
#if	defined(IRIX51)
		    fhtype = FHT_IRIX5;
#endif
#if	defined(SUNOS4)
		    fhtype = FHT_SUNOS4;
#endif
#if	defined(SUNOS5)
		    fhtype = FHT_SUNOS5;
#endif
#if	defined(ultrix)
		    fhtype = FHT_ULTRIX