kernel - TMPFS - Stabilization pass, fix lockf()

[dragonfly.git] / contrib / tcpdump / parsenfsfh.c

/*
 * 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
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.29 2006-06-13 22:21:38 guy Exp $ (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
#define FHT_BSD44       12

#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
#if     defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
     || defined(__OpenBSD__)
            fhtype = FHT_BSD44;
#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)
                 */
                if ((fhp[6] == 0) && (fhp[7] == 0)) {
                    fhtype = FHT_BSD44;
                }
                /*XXX we probably only need to test of these two bytes */
                else 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_BSD44:
            fsidp->Fsid_dev.Minor = fhp[0];
            fsidp->Fsid_dev.Major = fhp[1];
            fsidp->fsid_code = 0;

            temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
            *inop = temp;

            if (osnamep)
                *osnamep = "BSD 4.4";
            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;

#ifdef notdef
        case FHT_SUNOS3:
            /*
             * XXX - none of the heuristics above return this.
             * Are there any SunOS 3.x systems around to care about?
             */
            if (osnamep)
                *osnamep = "SUNOS3";
            break;
#endif

        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);
}