GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tcpdump/parsenfsfh.c Lines: 0 111 0.0 %
Date: 2017-11-13 Branches: 0 101 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: parsenfsfh.c,v 1.14 2016/01/15 18:02:18 mmcc Exp $	*/
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/*
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 * Copyright (c) 1993, 1994 Jeffrey C. Mogul, Digital Equipment Corporation,
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 * Western Research Laboratory. All rights reserved.
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 * Copyright (c) 2001 Compaq Computer Corporation. All rights reserved.
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 *
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 *  Permission to use, copy, and modify this software and its
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 *  documentation is hereby granted only under the following terms and
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 *  conditions.  Both the above copyright notice and this permission
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 *  notice must appear in all copies of the software, derivative works
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 *  or modified versions, and any portions thereof, and both notices
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 *  must appear in supporting documentation.
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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 the following conditions
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 *  are met:
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 *    1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *    2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 *  THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
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 *  DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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 *  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.   IN NO
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 *  EVENT SHALL COMPAQ COMPUTER CORPORATION BE LIABLE FOR ANY
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 *  SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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 *  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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 *  OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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 *  SOFTWARE.
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 */
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/*
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 * parsenfsfh.c - portable parser for NFS file handles
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 *			uses all sorts of heuristics
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 *
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 * Jeffrey C. Mogul
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 * Digital Equipment Corporation
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 * Western Research Laboratory
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 */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "nfsfh.h"
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/*
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 * This routine attempts to parse a file handle (in network byte order),
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 * using heuristics to guess what kind of format it is in.  See the
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 * file "fhandle_layouts" for a detailed description of the various
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 * patterns we know about.
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 *
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 * The file handle is parsed into our internal representation of a
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 * file-system id, and an internal representation of an inode-number.
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 */
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#define	FHT_UNKNOWN	0
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#define	FHT_AUSPEX	1
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#define	FHT_DECOSF	2
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#define	FHT_IRIX4	3
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#define	FHT_IRIX5	4
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#define	FHT_SUNOS3	5
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#define	FHT_SUNOS4	6
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#define	FHT_ULTRIX	7
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#define	FHT_VMSUCX	8
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#define	FHT_SUNOS5	9
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#define	FHT_AIX32	10
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#define	FHT_HPUX9	11
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#define	make_uint32(msb,b,c,lsb)\
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	((lsb) + ((c)<<8) + ((b)<<16) + ((msb)<<24))
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#define	make_uint24(msb,b, lsb)\
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	((lsb) + ((b)<<8) + ((msb)<<16))
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#define	make_uint16(msb,lsb)\
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	((lsb) + ((msb)<<8))
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#ifdef	__alpha
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	/* or other 64-bit systems */
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#define	make_uint48(msb,b,c,d,e,lsb)\
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	((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
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#else
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	/* on 32-bit systems ignore high-order bits */
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#define	make_uint48(msb,b,c,d,e,lsb)\
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	((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
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#endif
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static int is_UCX(unsigned char *);
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void
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Parse_fh(fh, fsidp, inop, osnamep, fsnamep)
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caddr_t *fh;
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my_fsid *fsidp;
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ino_t *inop;
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char **osnamep;		/* if non-NULL, return OS name here */
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char **fsnamep;		/* if non-NULL, return server fs name here (for VMS) */
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{
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	unsigned char *fhp = (unsigned char *)fh;
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	u_int32_t temp;
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	int fhtype = FHT_UNKNOWN;
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	/*
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	 * This is basically a big decision tree
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	 */
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	if ((fhp[0] == 0) && (fhp[1] == 0)) {
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	    /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
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	    /* probably rules out HP-UX, AIX unless they allow major=0 */
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	    if ((fhp[2] == 0) && (fhp[3] == 0)) {
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		/* bytes[2,3] == (0,0); must be Auspex */
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		/* XXX or could be Ultrix+MASSBUS "hp" disk? */
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		fhtype = FHT_AUSPEX;
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	    }
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	    else {
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		/*
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		 * bytes[2,3] != (0,0); rules out Auspex, could be
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		 * DECOSF, SUNOS4, or IRIX4
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		 */
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		if ((fhp[4] != 0) && (fhp[5] == 0) &&
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			(fhp[8] == 12) && (fhp[9] == 0)) {
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		    /* seems to be DECOSF, with minor == 0 */
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		    fhtype = FHT_DECOSF;
131
		}
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		else {
133
		    /* could be SUNOS4 or IRIX4 */
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		    /* XXX the test of fhp[5] == 8 could be wrong */
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		    if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
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			(fhp[7] == 0)) {
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			/* looks like a length, not a file system typecode */
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			fhtype = FHT_IRIX4;
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		    }
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		    else {
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			/* by elimination */
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			fhtype = FHT_SUNOS4;
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		    }
144
		}
145
	    }
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	}
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	else {
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	    /*
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	     * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
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	     * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
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	     * could be AIX, HP-UX
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	     */
153
	    if ((fhp[2] == 0) && (fhp[3] == 0)) {
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		/*
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		 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
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		 * (unless the exported device name is just one letter!),
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		 * could be Ultrix, IRIX5, AIX, or SUNOS5
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		 * might be HP-UX (depends on their values for minor devs)
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		 */
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		/*XXX we probably only need to test of these two bytes */
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		if ((fhp[21] == 0) && (fhp[23] == 0)) {
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		    fhtype = FHT_ULTRIX;
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		}
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		else {
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		    /* Could be SUNOS5/IRIX5, maybe AIX */
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		    /* XXX no obvious difference between SUNOS5 and IRIX5 */
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		    if (fhp[9] == 10)
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			fhtype = FHT_SUNOS5;
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		    /* XXX what about AIX? */
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		}
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	    }
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	    else {
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		/*
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		 * bytes[2,3] != (0,0); rules out Ultrix, could be
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		 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
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		 */
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		if ((fhp[8] == 12) && (fhp[9] == 0)) {
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		    fhtype = FHT_DECOSF;
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		}
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		else if ((fhp[8] == 0) && (fhp[9] == 10)) {
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		    /* could be SUNOS5/IRIX5, AIX, HP-UX */
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		    if ((fhp[7] == 0) && (fhp[6] == 0) &&
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			(fhp[5] == 0) && (fhp[4] == 0)) {
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			/* XXX is this always true of HP-UX? */
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			fhtype = FHT_HPUX9;
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		    }
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		    else if (fhp[7] == 2) {
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			/* This would be MNT_NFS on AIX, which is impossible */
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			fhtype = FHT_SUNOS5;	/* or maybe IRIX5 */
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		    }
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		    else {
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			/*
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			 * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
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			 * XXX see any way to disambiguate these, so
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			 * XXX I'm going with the more likely guess.
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			 * XXX Sorry, Big Blue.
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			 */
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			fhtype = FHT_SUNOS5;	/* or maybe IRIX5 */
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		    }
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	        }
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		else {
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		    if (is_UCX(fhp)) {
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			fhtype = FHT_VMSUCX;
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		    }
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		    else {
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			fhtype = FHT_UNKNOWN;
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		    }
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		}
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	    }
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	}
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	/* XXX still needs to handle SUNOS3 */
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	switch (fhtype) {
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	case FHT_AUSPEX:
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	    fsidp->Fsid_dev.Minor = fhp[7];
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	    fsidp->Fsid_dev.Major = fhp[6];
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	    fsidp->fsid_code = 0;
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	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
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	    *inop = temp;
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	    if (osnamep)
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		*osnamep = "Auspex";
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	    break;
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	case FHT_DECOSF:
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	    fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
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			/* XXX could ignore 3 high-order bytes */
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	    temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
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	    fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
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	    fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
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	    temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
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	    *inop = temp;
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	    if (osnamep)
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		*osnamep = "OSF";
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	    break;
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	case FHT_IRIX4:
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	    fsidp->Fsid_dev.Minor = fhp[3];
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	    fsidp->Fsid_dev.Major = fhp[2];
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	    fsidp->fsid_code = 0;
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	    temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
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	    *inop = temp;
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	    if (osnamep)
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		*osnamep = "IRIX4";
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	    break;
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	case FHT_IRIX5:
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	    fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
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	    fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
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	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
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	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
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	    *inop = temp;
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	    if (osnamep)
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		*osnamep = "IRIX5";
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	    break;
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	case FHT_SUNOS3:
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	    if (osnamep)
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		*osnamep = "SUNOS3";
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	    break;
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	case FHT_SUNOS4:
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	    fsidp->Fsid_dev.Minor = fhp[3];
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	    fsidp->Fsid_dev.Major = fhp[2];
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	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
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	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
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	    *inop = temp;
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	    if (osnamep)
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		*osnamep = "SUNOS4";
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	    break;
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	case FHT_SUNOS5:
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	    temp = make_uint16(fhp[0], fhp[1]);
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	    fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
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	    temp = make_uint24(fhp[1], fhp[2], fhp[3]);
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	    fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
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	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
288
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	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
290
	    *inop = temp;
291
292
	    if (osnamep)
293
		*osnamep = "SUNOS5";
294
	    break;
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	case FHT_ULTRIX:
297
	    fsidp->fsid_code = 0;
298
	    fsidp->Fsid_dev.Minor = fhp[0];
299
	    fsidp->Fsid_dev.Major = fhp[1];
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	    temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
302
	    *inop = temp;
303
	    if (osnamep)
304
		*osnamep = "Ultrix";
305
	    break;
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307
	case FHT_VMSUCX:
308
	    /* No numeric file system ID, so hash on the device-name */
309
	    if (sizeof(*fsidp) >= 14) {
310
		if (sizeof(*fsidp) > 14)
311
		    memset((char *)fsidp, 0, sizeof(*fsidp));
312
		/* just use the whole thing */
313
		memcpy((char *)fsidp, (char *)fh, 14);
314
	    }
315
	    else {
316
		u_int32_t tempa[4];	/* at least 16 bytes, maybe more */
317
318
		memset((char *)tempa, 0, sizeof(tempa));
319
		memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
320
		fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
321
		fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
322
		fsidp->fsid_code = 0;
323
	    }
324
325
	    /* VMS file ID is: (RVN, FidHi, FidLo) */
326
	    *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
327
328
	    /* Caller must save (and null-terminate?) this value */
329
	    if (fsnamep)
330
		*fsnamep = (char *)&(fhp[1]);
331
332
	    if (osnamep)
333
		*osnamep = "VMS";
334
	    break;
335
336
	case FHT_AIX32:
337
	    fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
338
	    fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
339
	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
340
341
	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
342
	    *inop = temp;
343
344
	    if (osnamep)
345
		*osnamep = "AIX32";
346
	    break;
347
348
	case FHT_HPUX9:
349
	    fsidp->Fsid_dev.Major = fhp[0];
350
	    temp = make_uint24(fhp[1], fhp[2], fhp[3]);
351
	    fsidp->Fsid_dev.Minor = temp;
352
	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
353
354
	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
355
	    *inop = temp;
356
357
	    if (osnamep)
358
		*osnamep = "HPUX9";
359
	    break;
360
361
	case FHT_UNKNOWN:
362
#ifdef DEBUG
363
	    {
364
		int i;
365
		for (i = 0; i < 32; i++)
366
			(void)fprintf(stderr, "%x.", fhp[i]);
367
		(void)fprintf(stderr, "\n");
368
	    }
369
#endif
370
	    /* XXX for now, give "bogus" values to aid debugging */
371
	    fsidp->fsid_code = 0;
372
	    fsidp->Fsid_dev.Minor = 257;
373
	    fsidp->Fsid_dev.Major = 257;
374
	    *inop = 1;
375
376
	    /* display will show this string instead of (257,257) */
377
	    if (fsnamep)
378
		*fsnamep = "Unknown";
379
380
	    if (osnamep)
381
		*osnamep = "Unknown";
382
	    break;
383
384
	}
385
}
386
387
/*
388
 * Is this a VMS UCX file handle?
389
 *	Check for:
390
 *	(1) leading code byte	[XXX not yet]
391
 *	(2) followed by string of printing chars & spaces
392
 *	(3) followed by string of nulls
393
 */
394
static int
395
is_UCX(fhp)
396
unsigned char *fhp;
397
{
398
	int i;
399
	int seen_null = 0;
400
401
	for (i = 1; i < 14; i++) {
402
	    if (isprint(fhp[i])) {
403
		if (seen_null)
404
		   return(0);
405
		else
406
		   continue;
407
	    }
408
	    else if (fhp[i] == 0) {
409
		seen_null = 1;
410
		continue;
411
	    }
412
	    else
413
		return(0);
414
	}
415
416
	return(1);
417
}