/*
* 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
*/
/*
* 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.
*/
static int is_UCX(netdissect_options *, const unsigned char *, u_int);
void
Parse_fh(netdissect_options *ndo, 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;
#endif
#if defined(__osf__)
fhtype = FHT_DECOSF;
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__)
fhtype = FHT_BSD44;
#endif
#if defined(__NetBSD__)
fhtype = FHT_NETBSD;
#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;
}
/*
* This is basically a big decision tree
*/
else if ((GET_U_1(fhp) == 0) && (GET_U_1(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 ((GET_U_1(fhp + 2) == 0) && (GET_U_1(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 ((GET_U_1(fhp + 4) != 0) && (GET_U_1(fhp + 5) == 0) &&
(GET_U_1(fhp + 8) == 12) && (GET_U_1(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 ((GET_U_1(fhp + 4) == 0) && (GET_U_1(fhp + 5) == 8) && (GET_U_1(fhp + 6) == 0) &&
(GET_U_1(fhp + 7) == 0)) {
/* looks like a length, not a file system typecode */
fhtype = FHT_IRIX4;
} else {
/* by elimination */
fhtype = FHT_SUNOS4;
}
}
}
} else {
/*
* bytes[2,3] != (0,0); rules out Ultrix, could be
* DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
*/
if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(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 ((GET_U_1(fhp + 6) == 0) && (GET_U_1(fhp + 7) == 0)) {
fhtype = FHT_BSD44;
}
/*XXX we probably only need to test of these two bytes */
else if ((len >= 24/4) && (GET_U_1(fhp + 21) == 0) && (GET_U_1(fhp + 23) == 0)) {
fhtype = FHT_ULTRIX;
} else {
/* Could be SUNOS5/IRIX5, maybe AIX */
/* XXX no obvious difference between SUNOS5 and IRIX5 */
if (GET_U_1(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 ((GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
fhtype = FHT_DECOSF;
} else if ((GET_U_1(fhp + 8) == 0) && (GET_U_1(fhp + 9) == 10)) {
/* could be SUNOS5/IRIX5, AIX, HP-UX */
if ((GET_U_1(fhp + 7) == 0) && (GET_U_1(fhp + 6) == 0) &&
(GET_U_1(fhp + 5) == 0) && (GET_U_1(fhp + 4) == 0)) {
/* XXX is this always true of HP-UX? */
fhtype = FHT_HPUX9;
} else if (GET_U_1(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(ndo, fhp, len)) {
fhtype = FHT_VMSUCX;
} else {
fhtype = FHT_UNKNOWN;
}
}
}
}
}
}
case FHT_BSD44:
case FHT_NETBSD:
fsidp->Fsid_dev.Minor = GET_U_1(fhp);
fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
fsidp->fsid_code = 0;
/*
* NetBSD puts the generation number before the inode; inode
* is 64 bits, but only 32 are typically used; XXX endian issues?
*/
if (fhtype == FHT_NETBSD)
*inop = GET_LE_U_4(fhp + 16);
else
*inop = GET_LE_U_4(fhp + 12);
if (osnamep)
*osnamep = "BSD 4.4";
break;
case FHT_DECOSF:
fsidp->fsid_code = GET_LE_U_4(fhp + 4);
/* XXX could ignore 3 high-order bytes */
#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_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, (const char *)fh, 14);
} else {
uint32_t tempa[4]; /* at least 16 bytes, maybe more */
case FHT_UNKNOWN:
#ifdef DEBUG
/* XXX debugging */
for (i = 0; i < len*4; i++)
(void)fprintf(stderr, "%x.", GET_U_1(fhp + i));
(void)fprintf(stderr, "\n");
#endif
/* Save the actual handle, so it can be display with -u */
/* XXX really ? When -u is used this function is not called */
for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
(void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X",
GET_U_1(fhp + i));
fsidp->Opaque_Handle[i*2] = '\0';
/* XXX for now, give "bogus" values to aid debugging */
fsidp->fsid_code = 0;
fsidp->Fsid_dev.Minor = UINT_MAX;
fsidp->Fsid_dev.Major = UINT_MAX;
*inop = 1;
/* display will show this string instead of (UINT_MAX,UINT_MAX) */
/* XXX really ? */
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(netdissect_options *ndo, const unsigned char *fhp, u_int len)
{
u_int i;
int seen_null = 0;
/*
* Require at least 28 bytes of file handle; it's variable-length
* in NFSv3. "len" is in units of 32-bit words, not bytes.
*/
if (len < 28/4)
return(0);
for (i = 1; i < 14; i++) {
if (ND_ASCII_ISPRINT(GET_U_1(fhp + i))) {
if (seen_null)
return(0);
else
continue;
} else if (GET_U_1(fhp + i) == 0) {
seen_null = 1;
continue;
} else
return(0);
}
