421 lines
10 KiB
C
421 lines
10 KiB
C
#ifndef lint
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static char *RCSid = "$Header: parsenfsfh.c,v 1.9 95/10/19 20:27:44 leres Exp $";
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#endif
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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 <memory.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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#ifdef ultrix
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/* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
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#define XFF(x) ((u_int32_t)(x))
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#else
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#define XFF(x) (x)
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#endif
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#define make_uint32(msb,b,c,lsb)\
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(XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
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#define make_uint24(msb,b, lsb)\
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(XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
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#define make_uint16(msb,lsb)\
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(XFF(lsb) + (XFF(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, len, fsidp, inop, osnamep, fsnamep, ourself)
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register caddr_t *fh;
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int len;
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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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int ourself; /* true if file handle was generated on this host */
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{
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register 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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if (ourself) {
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/* File handle generated on this host, no need for guessing */
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#if defined(IRIX40)
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fhtype = FHT_IRIX4;
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#endif
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#if defined(IRIX50)
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fhtype = FHT_IRIX5;
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#endif
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#if defined(IRIX51)
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fhtype = FHT_IRIX5;
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#endif
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#if defined(SUNOS4)
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fhtype = FHT_SUNOS4;
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#endif
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#if defined(SUNOS5)
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fhtype = FHT_SUNOS5;
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#endif
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#if defined(ultrix)
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fhtype = FHT_ULTRIX;
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#endif
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#if defined(__osf__)
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fhtype = FHT_DECOSF;
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#endif
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}
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/*
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* This is basically a big decision tree
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*/
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else 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;
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}
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else {
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/* 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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}
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}
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}
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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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*/
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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]);
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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 = "SUNOS5";
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break;
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case FHT_ULTRIX:
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fsidp->fsid_code = 0;
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fsidp->fsid_dev.Minor = fhp[0];
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fsidp->fsid_dev.Major = fhp[1];
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temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
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*inop = temp;
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if (osnamep)
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*osnamep = "Ultrix";
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break;
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case FHT_VMSUCX:
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/* No numeric file system ID, so hash on the device-name */
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if (sizeof(*fsidp) >= 14) {
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if (sizeof(*fsidp) > 14)
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memset((char *)fsidp, 0, sizeof(*fsidp));
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memcpy((char *)fsidp, fh, 14); /* just use the whole thing */
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}
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else {
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u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
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memset((char *)tempa, 0, sizeof(tempa));
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memcpy((char *)tempa, fh, 14); /* ensure alignment */
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fsidp->fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
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fsidp->fsid_dev.Major = tempa[2] + (tempa[3]<<1);
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fsidp->fsid_code = 0;
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}
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/* VMS file ID is: (RVN, FidHi, FidLo) */
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*inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
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/* Caller must save (and null-terminate?) this value */
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if (fsnamep)
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*fsnamep = (char *)&(fhp[1]);
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if (osnamep)
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*osnamep = "VMS";
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break;
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case FHT_AIX32:
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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 = "AIX32";
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break;
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case FHT_HPUX9:
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fsidp->fsid_dev.Major = fhp[0];
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temp = make_uint24(fhp[1], fhp[2], fhp[3]);
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fsidp->fsid_dev.Minor = temp;
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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 = "HPUX9";
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break;
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case FHT_UNKNOWN:
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#ifdef DEBUG
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{
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/* XXX debugging */
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int i;
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for (i = 0; i < 32; i++)
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(void)fprintf(stderr, "%x.", fhp[i]);
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(void)fprintf(stderr, "\n");
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}
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#endif
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/* XXX for now, give "bogus" values to aid debugging */
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fsidp->fsid_code = 0;
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fsidp->fsid_dev.Minor = 257;
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fsidp->fsid_dev.Major = 257;
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*inop = 1;
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/* display will show this string instead of (257,257) */
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if (fsnamep)
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*fsnamep = "Unknown";
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if (osnamep)
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*osnamep = "Unknown";
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break;
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}
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}
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/*
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* Is this a VMS UCX file handle?
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* Check for:
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* (1) leading code byte [XXX not yet]
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* (2) followed by string of printing chars & spaces
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* (3) followed by string of nulls
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*/
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static int
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is_UCX(fhp)
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unsigned char *fhp;
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{
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register int i;
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int seen_null = 0;
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for (i = 1; i < 14; i++) {
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if (isprint(fhp[i])) {
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if (seen_null)
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return(0);
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else
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continue;
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}
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else if (fhp[i] == 0) {
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seen_null = 1;
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continue;
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}
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else
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return(0);
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}
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return(1);
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}
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