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.
6 * Permission to use, copy, and modify this software and its
7 * documentation is hereby granted only under the following terms and
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9 * notice must appear in all copies of the software, derivative works
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11 * must appear in supporting documentation.
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14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
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
27 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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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
46 static const char rcsid[] _U_ =
47 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.29 2006-06-13 22:21:38 guy Exp $ (LBL)";
54 #include <tcpdump-stdinc.h>
59 #include "interface.h"
63 * This routine attempts to parse a file handle (in network byte order),
64 * using heuristics to guess what kind of format it is in. See the
65 * file "fhandle_layouts" for a detailed description of the various
66 * patterns we know about.
68 * The file handle is parsed into our internal representation of a
69 * file-system id, and an internal representation of an inode-number.
87 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
88 #define XFF(x) ((u_int32_t)(x))
93 #define make_uint32(msb,b,c,lsb)\
94 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
96 #define make_uint24(msb,b, lsb)\
97 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
99 #define make_uint16(msb,lsb)\
100 (XFF(lsb) + (XFF(msb)<<8))
103 /* or other 64-bit systems */
104 #define make_uint48(msb,b,c,d,e,lsb)\
105 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
107 /* on 32-bit systems ignore high-order bits */
108 #define make_uint48(msb,b,c,d,e,lsb)\
109 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
112 static int is_UCX(const unsigned char *);
115 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
116 register const unsigned char *fh;
120 const char **osnamep; /* if non-NULL, return OS name here */
121 const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */
122 int ourself; /* true if file handle was generated on this host */
124 register const unsigned char *fhp = fh;
126 int fhtype = FHT_UNKNOWN;
130 /* File handle generated on this host, no need for guessing */
152 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
153 || defined(__OpenBSD__)
158 * This is basically a big decision tree
160 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
161 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
162 /* probably rules out HP-UX, AIX unless they allow major=0 */
163 if ((fhp[2] == 0) && (fhp[3] == 0)) {
164 /* bytes[2,3] == (0,0); must be Auspex */
165 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
170 * bytes[2,3] != (0,0); rules out Auspex, could be
171 * DECOSF, SUNOS4, or IRIX4
173 if ((fhp[4] != 0) && (fhp[5] == 0) &&
174 (fhp[8] == 12) && (fhp[9] == 0)) {
175 /* seems to be DECOSF, with minor == 0 */
179 /* could be SUNOS4 or IRIX4 */
180 /* XXX the test of fhp[5] == 8 could be wrong */
181 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
183 /* looks like a length, not a file system typecode */
195 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
196 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
197 * could be AIX, HP-UX
199 if ((fhp[2] == 0) && (fhp[3] == 0)) {
201 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
202 * (unless the exported device name is just one letter!),
203 * could be Ultrix, IRIX5, AIX, or SUNOS5
204 * might be HP-UX (depends on their values for minor devs)
206 if ((fhp[6] == 0) && (fhp[7] == 0)) {
209 /*XXX we probably only need to test of these two bytes */
210 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
214 /* Could be SUNOS5/IRIX5, maybe AIX */
215 /* XXX no obvious difference between SUNOS5 and IRIX5 */
218 /* XXX what about AIX? */
223 * bytes[2,3] != (0,0); rules out Ultrix, could be
224 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
226 if ((fhp[8] == 12) && (fhp[9] == 0)) {
229 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
230 /* could be SUNOS5/IRIX5, AIX, HP-UX */
231 if ((fhp[7] == 0) && (fhp[6] == 0) &&
232 (fhp[5] == 0) && (fhp[4] == 0)) {
233 /* XXX is this always true of HP-UX? */
236 else if (fhp[7] == 2) {
237 /* This would be MNT_NFS on AIX, which is impossible */
238 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
242 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
243 * XXX see any way to disambiguate these, so
244 * XXX I'm going with the more likely guess.
245 * XXX Sorry, Big Blue.
247 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
255 fhtype = FHT_UNKNOWN;
261 /* XXX still needs to handle SUNOS3 */
265 fsidp->Fsid_dev.Minor = fhp[7];
266 fsidp->Fsid_dev.Major = fhp[6];
267 fsidp->fsid_code = 0;
269 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
277 fsidp->Fsid_dev.Minor = fhp[0];
278 fsidp->Fsid_dev.Major = fhp[1];
279 fsidp->fsid_code = 0;
281 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
285 *osnamep = "BSD 4.4";
289 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
290 /* XXX could ignore 3 high-order bytes */
292 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
293 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
294 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
296 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
303 fsidp->Fsid_dev.Minor = fhp[3];
304 fsidp->Fsid_dev.Major = fhp[2];
305 fsidp->fsid_code = 0;
307 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
315 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
316 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
317 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
319 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
329 * XXX - none of the heuristics above return this.
330 * Are there any SunOS 3.x systems around to care about?
338 fsidp->Fsid_dev.Minor = fhp[3];
339 fsidp->Fsid_dev.Major = fhp[2];
340 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
342 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
350 temp = make_uint16(fhp[0], fhp[1]);
351 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
352 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
353 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
354 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
356 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
364 fsidp->fsid_code = 0;
365 fsidp->Fsid_dev.Minor = fhp[0];
366 fsidp->Fsid_dev.Major = fhp[1];
368 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
375 /* No numeric file system ID, so hash on the device-name */
376 if (sizeof(*fsidp) >= 14) {
377 if (sizeof(*fsidp) > 14)
378 memset((char *)fsidp, 0, sizeof(*fsidp));
379 /* just use the whole thing */
380 memcpy((char *)fsidp, (char *)fh, 14);
383 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
385 memset((char *)tempa, 0, sizeof(tempa));
386 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
387 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
388 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
389 fsidp->fsid_code = 0;
392 /* VMS file ID is: (RVN, FidHi, FidLo) */
393 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
395 /* Caller must save (and null-terminate?) this value */
397 *fsnamep = (char *)&(fhp[1]);
404 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
405 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
406 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
408 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
416 fsidp->Fsid_dev.Major = fhp[0];
417 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
418 fsidp->Fsid_dev.Minor = temp;
419 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
421 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
431 for (i = 0; i < 32; i++)
432 (void)fprintf(stderr, "%x.", fhp[i]);
433 (void)fprintf(stderr, "\n");
435 /* Save the actual handle, so it can be display with -u */
436 for (i = 0; i < 32; i++)
437 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
439 /* XXX for now, give "bogus" values to aid debugging */
440 fsidp->fsid_code = 0;
441 fsidp->Fsid_dev.Minor = 257;
442 fsidp->Fsid_dev.Major = 257;
445 /* display will show this string instead of (257,257) */
447 *fsnamep = "Unknown";
450 *osnamep = "Unknown";
457 * Is this a VMS UCX file handle?
459 * (1) leading code byte [XXX not yet]
460 * (2) followed by string of printing chars & spaces
461 * (3) followed by string of nulls
465 const unsigned char *fhp;
470 for (i = 1; i < 14; i++) {
471 if (isprint(fhp[i])) {
477 else if (fhp[i] == 0) {