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tcpdump/parsenfsfh.c
Guy Harris c499612a7f Add nd_{v}snprintf() routines/wrappers. 
Some versions of the MSVC runtime library have a non-C99-compliant
vsnprintf(), which we want to avoid.  On Windows, use snprintf() and
vsnprintf() for VS 2015 and later, where they both exist in
C99-compliant forms, and wrap _{v}snprintf_s() otherwise (they're
guaranteed to do the null termination that we want).
2018-01-29 15:48:55 -08:00

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/*
* 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
#include "netdissect.h"
#include "extract.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) ((uint32_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))
static int is_UCX(const unsigned char *, u_int);
void
Parse_fh(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(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
|| defined(__OpenBSD__)
fhtype = FHT_BSD44;
#endif
}
/*
* This is basically a big decision tree
*/
else if ((EXTRACT_U_1(fhp) == 0) && (EXTRACT_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 ((EXTRACT_U_1(fhp + 2) == 0) && (EXTRACT_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 ((EXTRACT_U_1(fhp + 4) != 0) && (EXTRACT_U_1(fhp + 5) == 0) &&
(EXTRACT_U_1(fhp + 8) == 12) && (EXTRACT_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 ((EXTRACT_U_1(fhp + 4) == 0) && (EXTRACT_U_1(fhp + 5) == 8) && (EXTRACT_U_1(fhp + 6) == 0) &&
(EXTRACT_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[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
* could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
* could be AIX, HP-UX
*/
if ((EXTRACT_U_1(fhp + 2) == 0) && (EXTRACT_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 ((EXTRACT_U_1(fhp + 6) == 0) && (EXTRACT_U_1(fhp + 7) == 0)) {
fhtype = FHT_BSD44;
}
/*XXX we probably only need to test of these two bytes */
else if ((len >= 24/4) && (EXTRACT_U_1(fhp + 21) == 0) && (EXTRACT_U_1(fhp + 23) == 0)) {
fhtype = FHT_ULTRIX;
}
else {
/* Could be SUNOS5/IRIX5, maybe AIX */
/* XXX no obvious difference between SUNOS5 and IRIX5 */
if (EXTRACT_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 ((EXTRACT_U_1(fhp + 8) == 12) && (EXTRACT_U_1(fhp + 9) == 0)) {
fhtype = FHT_DECOSF;
}
else if ((EXTRACT_U_1(fhp + 8) == 0) && (EXTRACT_U_1(fhp + 9) == 10)) {
/* could be SUNOS5/IRIX5, AIX, HP-UX */
if ((EXTRACT_U_1(fhp + 7) == 0) && (EXTRACT_U_1(fhp + 6) == 0) &&
(EXTRACT_U_1(fhp + 5) == 0) && (EXTRACT_U_1(fhp + 4) == 0)) {
/* XXX is this always true of HP-UX? */
fhtype = FHT_HPUX9;
}
else if (EXTRACT_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(fhp, len)) {
fhtype = FHT_VMSUCX;
}
else {
fhtype = FHT_UNKNOWN;
}
}
}
}
}
/* XXX still needs to handle SUNOS3 */
switch (fhtype) {
case FHT_AUSPEX:
fsidp->Fsid_dev.Minor = EXTRACT_U_1(fhp + 7);
fsidp->Fsid_dev.Major = EXTRACT_U_1(fhp + 6);
fsidp->fsid_code = 0;
*inop = make_uint32(EXTRACT_U_1(fhp + 12), EXTRACT_U_1(fhp + 13),
EXTRACT_U_1(fhp + 14), EXTRACT_U_1(fhp + 15));
if (osnamep)
*osnamep = "Auspex";
break;
case FHT_BSD44:
fsidp->Fsid_dev.Minor = EXTRACT_U_1(fhp);
fsidp->Fsid_dev.Major = EXTRACT_U_1(fhp + 1);
fsidp->fsid_code = 0;
*inop = make_uint32(EXTRACT_U_1(fhp + 15), EXTRACT_U_1(fhp + 14),
EXTRACT_U_1(fhp + 13), EXTRACT_U_1(fhp + 12));
if (osnamep)
*osnamep = "BSD 4.4";
break;
case FHT_DECOSF:
fsidp->fsid_code = make_uint32(EXTRACT_U_1(fhp + 7),
EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 5),
EXTRACT_U_1(fhp + 4));
/* XXX could ignore 3 high-order bytes */
temp = make_uint32(EXTRACT_U_1(fhp + 3), EXTRACT_U_1(fhp + 2),
EXTRACT_U_1(fhp + 1), EXTRACT_U_1(fhp));
fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
*inop = make_uint32(EXTRACT_U_1(fhp + 15), EXTRACT_U_1(fhp + 14),
EXTRACT_U_1(fhp + 13), EXTRACT_U_1(fhp + 12));
if (osnamep)
*osnamep = "OSF";
break;
case FHT_IRIX4:
fsidp->Fsid_dev.Minor = EXTRACT_U_1(fhp + 3);
fsidp->Fsid_dev.Major = EXTRACT_U_1(fhp + 2);
fsidp->fsid_code = 0;
*inop = make_uint32(EXTRACT_U_1(fhp + 8), EXTRACT_U_1(fhp + 9),
EXTRACT_U_1(fhp + 10), EXTRACT_U_1(fhp + 11));
if (osnamep)
*osnamep = "IRIX4";
break;
case FHT_IRIX5:
fsidp->Fsid_dev.Minor = make_uint16(EXTRACT_U_1(fhp + 2),
EXTRACT_U_1(fhp + 3));
fsidp->Fsid_dev.Major = make_uint16(EXTRACT_U_1(fhp),
EXTRACT_U_1(fhp + 1));
fsidp->fsid_code = make_uint32(EXTRACT_U_1(fhp + 4),
EXTRACT_U_1(fhp + 5),
EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 7));
*inop = make_uint32(EXTRACT_U_1(fhp + 12), EXTRACT_U_1(fhp + 13),
EXTRACT_U_1(fhp + 14), EXTRACT_U_1(fhp + 15));
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 = EXTRACT_U_1(fhp + 3);
fsidp->Fsid_dev.Major = EXTRACT_U_1(fhp + 2);
fsidp->fsid_code = make_uint32(EXTRACT_U_1(fhp + 4),
EXTRACT_U_1(fhp + 5),
EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 7));
*inop = make_uint32(EXTRACT_U_1(fhp + 12), EXTRACT_U_1(fhp + 13),
EXTRACT_U_1(fhp + 14), EXTRACT_U_1(fhp + 15));
if (osnamep)
*osnamep = "SUNOS4";
break;
case FHT_SUNOS5:
temp = make_uint16(EXTRACT_U_1(fhp), EXTRACT_U_1(fhp + 1));
fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
temp = make_uint24(EXTRACT_U_1(fhp + 1), EXTRACT_U_1(fhp + 2),
EXTRACT_U_1(fhp + 3));
fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
fsidp->fsid_code = make_uint32(EXTRACT_U_1(fhp + 4),
EXTRACT_U_1(fhp + 5),
EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 7));
*inop = make_uint32(EXTRACT_U_1(fhp + 12), EXTRACT_U_1(fhp + 13),
EXTRACT_U_1(fhp + 14), EXTRACT_U_1(fhp + 15));
if (osnamep)
*osnamep = "SUNOS5";
break;
case FHT_ULTRIX:
fsidp->fsid_code = 0;
fsidp->Fsid_dev.Minor = EXTRACT_U_1(fhp);
fsidp->Fsid_dev.Major = EXTRACT_U_1(fhp + 1);
temp = make_uint32(EXTRACT_U_1(fhp + 7), EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 5), EXTRACT_U_1(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, (const char *)fh, 14);
}
else {
uint32_t tempa[4]; /* at least 16 bytes, maybe more */
memset((char *)tempa, 0, sizeof(tempa));
memcpy((char *)tempa, (const 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(EXTRACT_U_1(fhp + 26), EXTRACT_U_1(fhp + 27),
EXTRACT_U_1(fhp + 23), EXTRACT_U_1(fhp + 22));
/* Caller must save (and null-terminate?) this value */
if (fsnamep)
*fsnamep = (const char *)(fhp + 1);
if (osnamep)
*osnamep = "VMS";
break;
case FHT_AIX32:
fsidp->Fsid_dev.Minor = make_uint16(EXTRACT_U_1(fhp + 2),
EXTRACT_U_1(fhp + 3));
fsidp->Fsid_dev.Major = make_uint16(EXTRACT_U_1(fhp),
EXTRACT_U_1(fhp + 1));
fsidp->fsid_code = make_uint32(EXTRACT_U_1(fhp + 4),
EXTRACT_U_1(fhp + 5),
EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 7));
*inop = make_uint32(EXTRACT_U_1(fhp + 12), EXTRACT_U_1(fhp + 13),
EXTRACT_U_1(fhp + 14), EXTRACT_U_1(fhp + 15));
if (osnamep)
*osnamep = "AIX32";
break;
case FHT_HPUX9:
fsidp->Fsid_dev.Major = EXTRACT_U_1(fhp);
temp = make_uint24(EXTRACT_U_1(fhp + 1), EXTRACT_U_1(fhp + 2),
EXTRACT_U_1(fhp + 3));
fsidp->Fsid_dev.Minor = temp;
fsidp->fsid_code = make_uint32(EXTRACT_U_1(fhp + 4),
EXTRACT_U_1(fhp + 5),
EXTRACT_U_1(fhp + 6),
EXTRACT_U_1(fhp + 7));
*inop = make_uint32(EXTRACT_U_1(fhp + 12), EXTRACT_U_1(fhp + 13),
EXTRACT_U_1(fhp + 14), EXTRACT_U_1(fhp + 15));
if (osnamep)
*osnamep = "HPUX9";
break;
case FHT_UNKNOWN:
#ifdef DEBUG
/* XXX debugging */
for (i = 0; i < len*4; i++)
(void)fprintf(stderr, "%x.", EXTRACT_U_1(fhp + i));
(void)fprintf(stderr, "\n");
#endif
/* Save the actual handle, so it can be display with -u */
for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
(void)nd_snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X",
EXTRACT_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 = 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(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_ISPRINT(EXTRACT_U_1(fhp + i))) {
if (seen_null)
return(0);
else
continue;
}
else if (EXTRACT_U_1(fhp + i) == 0) {
seen_null = 1;
continue;
}
else
return(0);
}
return(1);
}
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