text: /*
   * 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
   *
   * $FreeBSD: src/contrib/tcpdump/parsenfsfh.c,v 1.9 2005/05/29 19:09:27 sam Exp $
   */
  
  #ifndef lint
  static const char rcsid[] _U_ =
      "@(#) $Header$ (LBL)";
  #endif
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <tcpdump-stdinc.h>
  
  #include <stdio.h>
  #include <string.h>
  
  #include "interface.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
  
  #ifdef	ultrix
  /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  #define	XFF(x)	((u_int32_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))
  
  #ifdef	__alpha
  	/* or other 64-bit systems */
  #define	make_uint48(msb,b,c,d,e,lsb)\
  	((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
  #else
  	/* on 32-bit systems ignore high-order bits */
  #define	make_uint48(msb,b,c,d,e,lsb)\
  	((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
  #endif
  
  static int is_UCX(const unsigned char *);
  
  void
  Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
  register const unsigned char *fh;
  int len _U_;
  my_fsid *fsidp;
  ino_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 */
  {
  	register const unsigned char *fhp = fh;
  	u_int32_t temp;
  	int fhtype = FHT_UNKNOWN;
  	int i;
  
  	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;
  #endif
  #if	defined(__osf__)
  	    fhtype = FHT_DECOSF;
  #endif
  	}
  	/*
  	 * This is basically a big decision tree
  	 */
  	else if ((fhp[0] == 0) && (fhp[1] == 0)) {
  	    /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
  	    /* probably rules out HP-UX, AIX unless they allow major=0 */
  	    if ((fhp[2] == 0) && (fhp[3] == 0)) {
  		/* bytes[2,3] == (0,0); must be Auspex */
  		/* XXX or could be Ultrix+MASSBUS "hp" disk? */
  		fhtype = FHT_AUSPEX;
  	    }
  	    else {
  		/*
  		 * bytes[2,3] != (0,0); rules out Auspex, could be
  		 * DECOSF, SUNOS4, or IRIX4
  		 */
  		if ((fhp[4] != 0) && (fhp[5] == 0) &&
  			(fhp[8] == 12) && (fhp[9] == 0)) {
  		    /* seems to be DECOSF, with minor == 0 */
  		    fhtype = FHT_DECOSF;
  		}
  		else {
  		    /* could be SUNOS4 or IRIX4 */
  		    /* XXX the test of fhp[5] == 8 could be wrong */
  		    if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
  			(fhp[7] == 0)) {
  			/* looks like a length, not a file system typecode */
  			fhtype = FHT_IRIX4;
  		    }
  		    else {
  			/* by elimination */
  			fhtype = FHT_SUNOS4;
  		    }
  		}
  	    }
  	}
  	else {
  	    /*
  	     * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
  	     * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
  	     * could be AIX, HP-UX
  	     */
  	    if ((fhp[2] == 0) && (fhp[3] == 0)) {
  		/*
  		 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
  		 * (unless the exported device name is just one letter!),
  		 * could be Ultrix, IRIX5, AIX, or SUNOS5
  		 * might be HP-UX (depends on their values for minor devs)
  		 */
  		/*XXX we probably only need to test of these two bytes */
  		if ((fhp[21] == 0) && (fhp[23] == 0)) {
  		    fhtype = FHT_ULTRIX;
  		}
  		else {
  		    /* Could be SUNOS5/IRIX5, maybe AIX */
  		    /* XXX no obvious difference between SUNOS5 and IRIX5 */
  		    if (fhp[9] == 10)
  			fhtype = FHT_SUNOS5;
  		    /* XXX what about AIX? */
  		}
  	    }
  	    else {
  		/*
  		 * bytes[2,3] != (0,0); rules out Ultrix, could be
  		 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
  		 */
  		if ((fhp[8] == 12) && (fhp[9] == 0)) {
  		    fhtype = FHT_DECOSF;
  		}
  		else if ((fhp[8] == 0) && (fhp[9] == 10)) {
  		    /* could be SUNOS5/IRIX5, AIX, HP-UX */
  		    if ((fhp[7] == 0) && (fhp[6] == 0) &&
  			(fhp[5] == 0) && (fhp[4] == 0)) {
  			/* XXX is this always true of HP-UX? */
  			fhtype = FHT_HPUX9;
  		    }
  		    else if (fhp[7] == 2) {
  			/* This would be MNT_NFS on AIX, which is impossible */
  			fhtype = FHT_SUNOS5;	/* or maybe IRIX5 */
  		    }
  		    else {
  			/*
  			 * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
  			 * XXX see any way to disambiguate these, so
  			 * XXX I'm going with the more likely guess.
  			 * XXX Sorry, Big Blue.
  			 */
  			fhtype = FHT_SUNOS5;	/* or maybe IRIX5 */
  		    }
  	        }
  		else {
  		    if (is_UCX(fhp)) {
  			fhtype = FHT_VMSUCX;
  		    }
  		    else {
  			fhtype = FHT_UNKNOWN;
  		    }
  		}
  	    }
  	}
  
  	/* XXX still needs to handle SUNOS3 */
  
  	switch (fhtype) {
  	case FHT_AUSPEX:
  	    fsidp->Fsid_dev.Minor = fhp[7];
  	    fsidp->Fsid_dev.Major = fhp[6];
  	    fsidp->fsid_code = 0;
  
  	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "Auspex";
  	    break;
  
  	case FHT_DECOSF:
  	    fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
  			/* XXX could ignore 3 high-order bytes */
  
  	    temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
  	    fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
  	    fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
  
  	    temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
  	    *inop = temp;
  	    if (osnamep)
  		*osnamep = "OSF";
  	    break;
  
  	case FHT_IRIX4:
  	    fsidp->Fsid_dev.Minor = fhp[3];
  	    fsidp->Fsid_dev.Major = fhp[2];
  	    fsidp->fsid_code = 0;
  
  	    temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "IRIX4";
  	    break;
  
  	case FHT_IRIX5:
  	    fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
  	    fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
  	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
  
  	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "IRIX5";
  	    break;
  
  	case FHT_SUNOS3:
  	    if (osnamep)
  		*osnamep = "SUNOS3";
  	    break;
  
  	case FHT_SUNOS4:
  	    fsidp->Fsid_dev.Minor = fhp[3];
  	    fsidp->Fsid_dev.Major = fhp[2];
  	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
  
  	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "SUNOS4";
  	    break;
  
  	case FHT_SUNOS5:
  	    temp = make_uint16(fhp[0], fhp[1]);
  	    fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
  	    temp = make_uint24(fhp[1], fhp[2], fhp[3]);
  	    fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
  	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
  
  	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "SUNOS5";
  	    break;
  
  	case FHT_ULTRIX:
  	    fsidp->fsid_code = 0;
  	    fsidp->Fsid_dev.Minor = fhp[0];
  	    fsidp->Fsid_dev.Major = fhp[1];
  
  	    temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
  	    *inop = temp;
  	    if (osnamep)
  		*osnamep = "Ultrix";
  	    break;
  
  	case FHT_VMSUCX:
  	    /* No numeric file system ID, so hash on the device-name */
  	    if (sizeof(*fsidp) >= 14) {
  		if (sizeof(*fsidp) > 14)
  		    memset((char *)fsidp, 0, sizeof(*fsidp));
  		/* just use the whole thing */
  		memcpy((char *)fsidp, (char *)fh, 14);
  	    }
  	    else {
  		u_int32_t tempa[4];	/* at least 16 bytes, maybe more */
  
  		memset((char *)tempa, 0, sizeof(tempa));
  		memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
  		fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
  		fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
  		fsidp->fsid_code = 0;
  	    }
  
  	    /* VMS file ID is: (RVN, FidHi, FidLo) */
  	    *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
  
  	    /* Caller must save (and null-terminate?) this value */
  	    if (fsnamep)
  		*fsnamep = (char *)&(fhp[1]);
  
  	    if (osnamep)
  		*osnamep = "VMS";
  	    break;
  
  	case FHT_AIX32:
  	    fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
  	    fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
  	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
  
  	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "AIX32";
  	    break;
  
  	case FHT_HPUX9:
  	    fsidp->Fsid_dev.Major = fhp[0];
  	    temp = make_uint24(fhp[1], fhp[2], fhp[3]);
  	    fsidp->Fsid_dev.Minor = temp;
  	    fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
  
  	    temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
  	    *inop = temp;
  
  	    if (osnamep)
  		*osnamep = "HPUX9";
  	    break;
  
  	case FHT_UNKNOWN:
  #ifdef DEBUG
  	    /* XXX debugging */
  	    for (i = 0; i < 32; i++)
  		(void)fprintf(stderr, "%x.", fhp[i]);
  	    (void)fprintf(stderr, "\n");
  #endif
  	    /* Save the actual handle, so it can be display with -u */
  	    for (i = 0; i < 32; i++)
  	    	(void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
  
  	    /* XXX for now, give "bogus" values to aid debugging */
  	    fsidp->fsid_code = 0;
  	    fsidp->Fsid_dev.Minor = 257;
  	    fsidp->Fsid_dev.Major = 257;
  	    *inop = 1;
  
  	    /* display will show this string instead of (257,257) */
  	    if (fsnamep)
  		*fsnamep = "Unknown";
  
  	    if (osnamep)
  		*osnamep = "Unknown";
  	    break;
  
  	}
  }
  
  /*
   * Is this a VMS UCX file handle?
   *	Check for:
   *	(1) leading code byte	[XXX not yet]
   *	(2) followed by string of printing chars & spaces
   *	(3) followed by string of nulls
   */
  static int
  is_UCX(fhp)
  const unsigned char *fhp;
  {
  	register int i;
  	int seen_null = 0;
  
  	for (i = 1; i < 14; i++) {
  	    if (isprint(fhp[i])) {
  		if (seen_null)
  		   return(0);
  		else
  		   continue;
  	    }
  	    else if (fhp[i] == 0) {
  		seen_null = 1;
  		continue;
  	    }
  	    else
  		return(0);
  	}
  
  	return(1);
  }
  