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NetBSD/usr.sbin/tcpdump/parsenfsfh.c

429 lines
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C
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/* $NetBSD: parsenfsfh.c,v 1.3 1996/05/20 00:41:07 fvdl Exp $ */
#ifndef lint
static char *RCSid = "Header: parsenfsfh.c,v 1.5 94/01/13 19:06:41 leres Exp";
#endif
/*
* parsenfsfh.c - portable parser for NFS file handles
* uses all sorts of heuristics
*
* Jeffrey C. Mogul
* Digital Equipment Corporation
* Western Research Laboratory
*/
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "interface.h"
#include "nfsfh.h"
/*
* Make sure that we use 32-bit integers when necessary. The "x"
* suffix is to avoid possible identifier conflicts.
*/
typedef int int32x;
typedef unsigned int u_int32x;
/*
* 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) ((unsigned long)(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(unsigned char *);
void
Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
register caddr_t *fh;
int len;
my_fsid *fsidp;
ino_t *inop;
char **osnamep; /* if non-NULL, return OS name here */
char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */
int ourself; /* true if file handle was generated on this host */
{
register unsigned char *fhp = (unsigned char *)fh;
u_int32x temp;
int fhtype = FHT_UNKNOWN;
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)
bzero((char *)fsidp, sizeof(*fsidp));
bcopy(fh, (char *)fsidp, 14); /* just use the whole thing */
}
else {
u_long tempa[4]; /* at least 16 bytes, maybe more */
bzero((char *)tempa, sizeof(tempa));
bcopy(fh, (char *)tempa, 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 */
int i;
for (i=0; i<32;i++) fprintf(stderr, "%x.", fhp[i]);
fprintf(stderr, "\n");
}
#endif
/* 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)
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);
}
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