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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14 * modification, are permitted provided that the following conditions
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19 * notice, this list of conditions and the following disclaimer in
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23 * THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
24 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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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
46 static const char rcsid[] _U_ =
47 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.28 2004/03/25 03:30:55 mcr 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.
86 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
87 #define XFF(x) ((u_int32_t)(x))
92 #define make_uint32(msb,b,c,lsb)\
93 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
95 #define make_uint24(msb,b, lsb)\
96 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
98 #define make_uint16(msb,lsb)\
99 (XFF(lsb) + (XFF(msb)<<8))
102 /* or other 64-bit systems */
103 #define make_uint48(msb,b,c,d,e,lsb)\
104 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
106 /* on 32-bit systems ignore high-order bits */
107 #define make_uint48(msb,b,c,d,e,lsb)\
108 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
111 static int is_UCX(const unsigned char *);
114 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
115 register const unsigned char *fh;
119 const char **osnamep; /* if non-NULL, return OS name here */
120 const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */
121 int ourself; /* true if file handle was generated on this host */
123 register const unsigned char *fhp = fh;
125 int fhtype = FHT_UNKNOWN;
129 /* File handle generated on this host, no need for guessing */
153 * This is basically a big decision tree
155 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
156 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
157 /* probably rules out HP-UX, AIX unless they allow major=0 */
158 if ((fhp[2] == 0) && (fhp[3] == 0)) {
159 /* bytes[2,3] == (0,0); must be Auspex */
160 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
165 * bytes[2,3] != (0,0); rules out Auspex, could be
166 * DECOSF, SUNOS4, or IRIX4
168 if ((fhp[4] != 0) && (fhp[5] == 0) &&
169 (fhp[8] == 12) && (fhp[9] == 0)) {
170 /* seems to be DECOSF, with minor == 0 */
174 /* could be SUNOS4 or IRIX4 */
175 /* XXX the test of fhp[5] == 8 could be wrong */
176 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
178 /* looks like a length, not a file system typecode */
190 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
191 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
192 * could be AIX, HP-UX
194 if ((fhp[2] == 0) && (fhp[3] == 0)) {
196 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
197 * (unless the exported device name is just one letter!),
198 * could be Ultrix, IRIX5, AIX, or SUNOS5
199 * might be HP-UX (depends on their values for minor devs)
201 /*XXX we probably only need to test of these two bytes */
202 if ((fhp[21] == 0) && (fhp[23] == 0)) {
206 /* Could be SUNOS5/IRIX5, maybe AIX */
207 /* XXX no obvious difference between SUNOS5 and IRIX5 */
210 /* XXX what about AIX? */
215 * bytes[2,3] != (0,0); rules out Ultrix, could be
216 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
218 if ((fhp[8] == 12) && (fhp[9] == 0)) {
221 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
222 /* could be SUNOS5/IRIX5, AIX, HP-UX */
223 if ((fhp[7] == 0) && (fhp[6] == 0) &&
224 (fhp[5] == 0) && (fhp[4] == 0)) {
225 /* XXX is this always true of HP-UX? */
228 else if (fhp[7] == 2) {
229 /* This would be MNT_NFS on AIX, which is impossible */
230 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
234 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
235 * XXX see any way to disambiguate these, so
236 * XXX I'm going with the more likely guess.
237 * XXX Sorry, Big Blue.
239 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
247 fhtype = FHT_UNKNOWN;
253 /* XXX still needs to handle SUNOS3 */
257 fsidp->Fsid_dev.Minor = fhp[7];
258 fsidp->Fsid_dev.Major = fhp[6];
259 fsidp->fsid_code = 0;
261 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
269 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
270 /* XXX could ignore 3 high-order bytes */
272 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
273 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
274 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
276 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
283 fsidp->Fsid_dev.Minor = fhp[3];
284 fsidp->Fsid_dev.Major = fhp[2];
285 fsidp->fsid_code = 0;
287 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
295 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
296 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
297 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
299 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
312 fsidp->Fsid_dev.Minor = fhp[3];
313 fsidp->Fsid_dev.Major = fhp[2];
314 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
316 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
324 temp = make_uint16(fhp[0], fhp[1]);
325 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
326 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
327 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
328 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
330 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
338 fsidp->fsid_code = 0;
339 fsidp->Fsid_dev.Minor = fhp[0];
340 fsidp->Fsid_dev.Major = fhp[1];
342 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
349 /* No numeric file system ID, so hash on the device-name */
350 if (sizeof(*fsidp) >= 14) {
351 if (sizeof(*fsidp) > 14)
352 memset((char *)fsidp, 0, sizeof(*fsidp));
353 /* just use the whole thing */
354 memcpy((char *)fsidp, (char *)fh, 14);
357 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
359 memset((char *)tempa, 0, sizeof(tempa));
360 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
361 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
362 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
363 fsidp->fsid_code = 0;
366 /* VMS file ID is: (RVN, FidHi, FidLo) */
367 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
369 /* Caller must save (and null-terminate?) this value */
371 *fsnamep = (char *)&(fhp[1]);
378 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
379 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
380 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
382 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
390 fsidp->Fsid_dev.Major = fhp[0];
391 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
392 fsidp->Fsid_dev.Minor = temp;
393 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
395 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
405 for (i = 0; i < 32; i++)
406 (void)fprintf(stderr, "%x.", fhp[i]);
407 (void)fprintf(stderr, "\n");
409 /* Save the actual handle, so it can be display with -u */
410 for (i = 0; i < 32; i++)
411 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
413 /* XXX for now, give "bogus" values to aid debugging */
414 fsidp->fsid_code = 0;
415 fsidp->Fsid_dev.Minor = 257;
416 fsidp->Fsid_dev.Major = 257;
419 /* display will show this string instead of (257,257) */
421 *fsnamep = "Unknown";
424 *osnamep = "Unknown";
431 * Is this a VMS UCX file handle?
433 * (1) leading code byte [XXX not yet]
434 * (2) followed by string of printing chars & spaces
435 * (3) followed by string of nulls
439 const unsigned char *fhp;
444 for (i = 1; i < 14; i++) {
445 if (isprint(fhp[i])) {
451 else if (fhp[i] == 0) {