2 * Copyright (c) 1993, 1994 Jeffrey C. Mogul, Digital Equipment Corporation,
3 * Western Research Laboratory. All rights reserved.
4 * Copyright (c) 2001 Compaq Computer Corporation. All rights reserved.
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7 * documentation is hereby granted only under the following terms and
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11 * must appear in supporting documentation.
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14 * modification, are permitted provided that the following conditions
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19 * notice, this list of conditions and the following disclaimer in
20 * the documentation and/or other materials provided with the
23 * THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
24 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
25 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
26 * EVENT SHALL COMPAQ COMPUTER CORPORATION BE LIABLE FOR ANY
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35 * parsenfsfh.c - portable parser for NFS file handles
36 * uses all sorts of heuristics
39 * Digital Equipment Corporation
40 * Western Research Laboratory
44 static const char rcsid[] _U_ =
45 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.28.2.1 2007/06/15 19:15:04 guy Exp $ (LBL)";
52 #include <tcpdump-stdinc.h>
57 #include "interface.h"
61 * This routine attempts to parse a file handle (in network byte order),
62 * using heuristics to guess what kind of format it is in. See the
63 * file "fhandle_layouts" for a detailed description of the various
64 * patterns we know about.
66 * The file handle is parsed into our internal representation of a
67 * file-system id, and an internal representation of an inode-number.
85 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
86 #define XFF(x) ((u_int32_t)(x))
91 #define make_uint32(msb,b,c,lsb)\
92 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
94 #define make_uint24(msb,b, lsb)\
95 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
97 #define make_uint16(msb,lsb)\
98 (XFF(lsb) + (XFF(msb)<<8))
101 /* or other 64-bit systems */
102 #define make_uint48(msb,b,c,d,e,lsb)\
103 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
105 /* on 32-bit systems ignore high-order bits */
106 #define make_uint48(msb,b,c,d,e,lsb)\
107 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
110 static int is_UCX(const unsigned char *);
113 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
114 register const unsigned char *fh;
118 const char **osnamep; /* if non-NULL, return OS name here */
119 const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */
120 int ourself; /* true if file handle was generated on this host */
122 register const unsigned char *fhp = fh;
124 int fhtype = FHT_UNKNOWN;
128 /* File handle generated on this host, no need for guessing */
150 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
151 || defined(__OpenBSD__)
156 * This is basically a big decision tree
158 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
159 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
160 /* probably rules out HP-UX, AIX unless they allow major=0 */
161 if ((fhp[2] == 0) && (fhp[3] == 0)) {
162 /* bytes[2,3] == (0,0); must be Auspex */
163 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
168 * bytes[2,3] != (0,0); rules out Auspex, could be
169 * DECOSF, SUNOS4, or IRIX4
171 if ((fhp[4] != 0) && (fhp[5] == 0) &&
172 (fhp[8] == 12) && (fhp[9] == 0)) {
173 /* seems to be DECOSF, with minor == 0 */
177 /* could be SUNOS4 or IRIX4 */
178 /* XXX the test of fhp[5] == 8 could be wrong */
179 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
181 /* looks like a length, not a file system typecode */
193 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
194 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
195 * could be AIX, HP-UX
197 if ((fhp[2] == 0) && (fhp[3] == 0)) {
199 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
200 * (unless the exported device name is just one letter!),
201 * could be Ultrix, IRIX5, AIX, or SUNOS5
202 * might be HP-UX (depends on their values for minor devs)
204 if ((fhp[6] == 0) && (fhp[7] == 0)) {
207 /*XXX we probably only need to test of these two bytes */
208 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
212 /* Could be SUNOS5/IRIX5, maybe AIX */
213 /* XXX no obvious difference between SUNOS5 and IRIX5 */
216 /* XXX what about AIX? */
221 * bytes[2,3] != (0,0); rules out Ultrix, could be
222 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
224 if ((fhp[8] == 12) && (fhp[9] == 0)) {
227 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
228 /* could be SUNOS5/IRIX5, AIX, HP-UX */
229 if ((fhp[7] == 0) && (fhp[6] == 0) &&
230 (fhp[5] == 0) && (fhp[4] == 0)) {
231 /* XXX is this always true of HP-UX? */
234 else if (fhp[7] == 2) {
235 /* This would be MNT_NFS on AIX, which is impossible */
236 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
240 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
241 * XXX see any way to disambiguate these, so
242 * XXX I'm going with the more likely guess.
243 * XXX Sorry, Big Blue.
245 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
253 fhtype = FHT_UNKNOWN;
259 /* XXX still needs to handle SUNOS3 */
263 fsidp->Fsid_dev.Minor = fhp[7];
264 fsidp->Fsid_dev.Major = fhp[6];
265 fsidp->fsid_code = 0;
267 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
275 fsidp->Fsid_dev.Minor = fhp[0];
276 fsidp->Fsid_dev.Major = fhp[1];
277 fsidp->fsid_code = 0;
279 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
283 *osnamep = "BSD 4.4";
287 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
288 /* XXX could ignore 3 high-order bytes */
290 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
291 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
292 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
294 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
301 fsidp->Fsid_dev.Minor = fhp[3];
302 fsidp->Fsid_dev.Major = fhp[2];
303 fsidp->fsid_code = 0;
305 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
313 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
314 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
315 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
317 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
327 * XXX - none of the heuristics above return this.
328 * Are there any SunOS 3.x systems around to care about?
336 fsidp->Fsid_dev.Minor = fhp[3];
337 fsidp->Fsid_dev.Major = fhp[2];
338 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
340 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
348 temp = make_uint16(fhp[0], fhp[1]);
349 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
350 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
351 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
352 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
354 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
362 fsidp->fsid_code = 0;
363 fsidp->Fsid_dev.Minor = fhp[0];
364 fsidp->Fsid_dev.Major = fhp[1];
366 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
373 /* No numeric file system ID, so hash on the device-name */
374 if (sizeof(*fsidp) >= 14) {
375 if (sizeof(*fsidp) > 14)
376 memset((char *)fsidp, 0, sizeof(*fsidp));
377 /* just use the whole thing */
378 memcpy((char *)fsidp, (char *)fh, 14);
381 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
383 memset((char *)tempa, 0, sizeof(tempa));
384 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
385 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
386 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
387 fsidp->fsid_code = 0;
390 /* VMS file ID is: (RVN, FidHi, FidLo) */
391 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
393 /* Caller must save (and null-terminate?) this value */
395 *fsnamep = (char *)&(fhp[1]);
402 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
403 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
404 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
406 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
414 fsidp->Fsid_dev.Major = fhp[0];
415 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
416 fsidp->Fsid_dev.Minor = temp;
417 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
419 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
429 for (i = 0; i < 32; i++)
430 (void)fprintf(stderr, "%x.", fhp[i]);
431 (void)fprintf(stderr, "\n");
433 /* Save the actual handle, so it can be display with -u */
434 for (i = 0; i < 32; i++)
435 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
437 /* XXX for now, give "bogus" values to aid debugging */
438 fsidp->fsid_code = 0;
439 fsidp->Fsid_dev.Minor = 257;
440 fsidp->Fsid_dev.Major = 257;
443 /* display will show this string instead of (257,257) */
445 *fsnamep = "Unknown";
448 *osnamep = "Unknown";
455 * Is this a VMS UCX file handle?
457 * (1) leading code byte [XXX not yet]
458 * (2) followed by string of printing chars & spaces
459 * (3) followed by string of nulls
463 const unsigned char *fhp;
468 for (i = 1; i < 14; i++) {
469 if (isprint(fhp[i])) {
475 else if (fhp[i] == 0) {