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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14 * modification, are permitted provided that the following conditions
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23 * THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
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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
44 static const char rcsid[] _U_ =
45 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.28 2004/03/25 03:30:55 mcr 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.
84 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
85 #define XFF(x) ((u_int32_t)(x))
90 #define make_uint32(msb,b,c,lsb)\
91 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
93 #define make_uint24(msb,b, lsb)\
94 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
96 #define make_uint16(msb,lsb)\
97 (XFF(lsb) + (XFF(msb)<<8))
100 /* or other 64-bit systems */
101 #define make_uint48(msb,b,c,d,e,lsb)\
102 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
104 /* on 32-bit systems ignore high-order bits */
105 #define make_uint48(msb,b,c,d,e,lsb)\
106 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
109 static int is_UCX(const unsigned char *);
112 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
113 register const unsigned char *fh;
117 const char **osnamep; /* if non-NULL, return OS name here */
118 const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */
119 int ourself; /* true if file handle was generated on this host */
121 register const unsigned char *fhp = fh;
123 int fhtype = FHT_UNKNOWN;
127 /* File handle generated on this host, no need for guessing */
151 * This is basically a big decision tree
153 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
154 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
155 /* probably rules out HP-UX, AIX unless they allow major=0 */
156 if ((fhp[2] == 0) && (fhp[3] == 0)) {
157 /* bytes[2,3] == (0,0); must be Auspex */
158 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
163 * bytes[2,3] != (0,0); rules out Auspex, could be
164 * DECOSF, SUNOS4, or IRIX4
166 if ((fhp[4] != 0) && (fhp[5] == 0) &&
167 (fhp[8] == 12) && (fhp[9] == 0)) {
168 /* seems to be DECOSF, with minor == 0 */
172 /* could be SUNOS4 or IRIX4 */
173 /* XXX the test of fhp[5] == 8 could be wrong */
174 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
176 /* looks like a length, not a file system typecode */
188 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
189 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
190 * could be AIX, HP-UX
192 if ((fhp[2] == 0) && (fhp[3] == 0)) {
194 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
195 * (unless the exported device name is just one letter!),
196 * could be Ultrix, IRIX5, AIX, or SUNOS5
197 * might be HP-UX (depends on their values for minor devs)
199 /*XXX we probably only need to test of these two bytes */
200 if ((fhp[21] == 0) && (fhp[23] == 0)) {
204 /* Could be SUNOS5/IRIX5, maybe AIX */
205 /* XXX no obvious difference between SUNOS5 and IRIX5 */
208 /* XXX what about AIX? */
213 * bytes[2,3] != (0,0); rules out Ultrix, could be
214 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
216 if ((fhp[8] == 12) && (fhp[9] == 0)) {
219 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
220 /* could be SUNOS5/IRIX5, AIX, HP-UX */
221 if ((fhp[7] == 0) && (fhp[6] == 0) &&
222 (fhp[5] == 0) && (fhp[4] == 0)) {
223 /* XXX is this always true of HP-UX? */
226 else if (fhp[7] == 2) {
227 /* This would be MNT_NFS on AIX, which is impossible */
228 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
232 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
233 * XXX see any way to disambiguate these, so
234 * XXX I'm going with the more likely guess.
235 * XXX Sorry, Big Blue.
237 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
245 fhtype = FHT_UNKNOWN;
251 /* XXX still needs to handle SUNOS3 */
255 fsidp->Fsid_dev.Minor = fhp[7];
256 fsidp->Fsid_dev.Major = fhp[6];
257 fsidp->fsid_code = 0;
259 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
267 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
268 /* XXX could ignore 3 high-order bytes */
270 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
271 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
272 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
274 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
281 fsidp->Fsid_dev.Minor = fhp[3];
282 fsidp->Fsid_dev.Major = fhp[2];
283 fsidp->fsid_code = 0;
285 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
293 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
294 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
295 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
297 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
310 fsidp->Fsid_dev.Minor = fhp[3];
311 fsidp->Fsid_dev.Major = fhp[2];
312 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
314 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
322 temp = make_uint16(fhp[0], fhp[1]);
323 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
324 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
325 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
326 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
328 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
336 fsidp->fsid_code = 0;
337 fsidp->Fsid_dev.Minor = fhp[0];
338 fsidp->Fsid_dev.Major = fhp[1];
340 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
347 /* No numeric file system ID, so hash on the device-name */
348 if (sizeof(*fsidp) >= 14) {
349 if (sizeof(*fsidp) > 14)
350 memset((char *)fsidp, 0, sizeof(*fsidp));
351 /* just use the whole thing */
352 memcpy((char *)fsidp, (char *)fh, 14);
355 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
357 memset((char *)tempa, 0, sizeof(tempa));
358 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
359 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
360 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
361 fsidp->fsid_code = 0;
364 /* VMS file ID is: (RVN, FidHi, FidLo) */
365 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
367 /* Caller must save (and null-terminate?) this value */
369 *fsnamep = (char *)&(fhp[1]);
376 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
377 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
378 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
380 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
388 fsidp->Fsid_dev.Major = fhp[0];
389 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
390 fsidp->Fsid_dev.Minor = temp;
391 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
393 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
403 for (i = 0; i < 32; i++)
404 (void)fprintf(stderr, "%x.", fhp[i]);
405 (void)fprintf(stderr, "\n");
407 /* Save the actual handle, so it can be display with -u */
408 for (i = 0; i < 32; i++)
409 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
411 /* XXX for now, give "bogus" values to aid debugging */
412 fsidp->fsid_code = 0;
413 fsidp->Fsid_dev.Minor = 257;
414 fsidp->Fsid_dev.Major = 257;
417 /* display will show this string instead of (257,257) */
419 *fsnamep = "Unknown";
422 *osnamep = "Unknown";
429 * Is this a VMS UCX file handle?
431 * (1) leading code byte [XXX not yet]
432 * (2) followed by string of printing chars & spaces
433 * (3) followed by string of nulls
437 const unsigned char *fhp;
442 for (i = 1; i < 14; i++) {
443 if (isprint(fhp[i])) {
449 else if (fhp[i] == 0) {