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
8 * conditions. Both the above copyright notice and this permission
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
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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
45 #define NETDISSECT_REWORKED
50 #include <tcpdump-stdinc.h>
55 #include "interface.h"
59 * This routine attempts to parse a file handle (in network byte order),
60 * using heuristics to guess what kind of format it is in. See the
61 * file "fhandle_layouts" for a detailed description of the various
62 * patterns we know about.
64 * The file handle is parsed into our internal representation of a
65 * file-system id, and an internal representation of an inode-number.
83 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
84 #define XFF(x) ((uint32_t)(x))
89 #define make_uint32(msb,b,c,lsb)\
90 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
92 #define make_uint24(msb,b, lsb)\
93 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
95 #define make_uint16(msb,lsb)\
96 (XFF(lsb) + (XFF(msb)<<8))
99 /* or other 64-bit systems */
100 #define make_uint48(msb,b,c,d,e,lsb)\
101 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
103 /* on 32-bit systems ignore high-order bits */
104 #define make_uint48(msb,b,c,d,e,lsb)\
105 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
108 static int is_UCX(const unsigned char *);
111 Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp,
113 const char **osnamep, /* if non-NULL, return OS name here */
114 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
115 int ourself) /* true if file handle was generated on this host */
117 register const unsigned char *fhp = fh;
119 int fhtype = FHT_UNKNOWN;
123 /* File handle generated on this host, no need for guessing */
145 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
146 || defined(__OpenBSD__)
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 if ((fhp[6] == 0) && (fhp[7] == 0)) {
202 /*XXX we probably only need to test of these two bytes */
203 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
207 /* Could be SUNOS5/IRIX5, maybe AIX */
208 /* XXX no obvious difference between SUNOS5 and IRIX5 */
211 /* XXX what about AIX? */
216 * bytes[2,3] != (0,0); rules out Ultrix, could be
217 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
219 if ((fhp[8] == 12) && (fhp[9] == 0)) {
222 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
223 /* could be SUNOS5/IRIX5, AIX, HP-UX */
224 if ((fhp[7] == 0) && (fhp[6] == 0) &&
225 (fhp[5] == 0) && (fhp[4] == 0)) {
226 /* XXX is this always true of HP-UX? */
229 else if (fhp[7] == 2) {
230 /* This would be MNT_NFS on AIX, which is impossible */
231 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
235 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
236 * XXX see any way to disambiguate these, so
237 * XXX I'm going with the more likely guess.
238 * XXX Sorry, Big Blue.
240 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
248 fhtype = FHT_UNKNOWN;
254 /* XXX still needs to handle SUNOS3 */
258 fsidp->Fsid_dev.Minor = fhp[7];
259 fsidp->Fsid_dev.Major = fhp[6];
260 fsidp->fsid_code = 0;
262 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
269 fsidp->Fsid_dev.Minor = fhp[0];
270 fsidp->Fsid_dev.Major = fhp[1];
271 fsidp->fsid_code = 0;
273 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
276 *osnamep = "BSD 4.4";
280 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
281 /* XXX could ignore 3 high-order bytes */
283 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
284 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
285 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
287 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
293 fsidp->Fsid_dev.Minor = fhp[3];
294 fsidp->Fsid_dev.Major = fhp[2];
295 fsidp->fsid_code = 0;
297 *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
304 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
305 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
306 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
308 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
317 * XXX - none of the heuristics above return this.
318 * Are there any SunOS 3.x systems around to care about?
326 fsidp->Fsid_dev.Minor = fhp[3];
327 fsidp->Fsid_dev.Major = fhp[2];
328 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
330 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
337 temp = make_uint16(fhp[0], fhp[1]);
338 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
339 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
340 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
341 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
343 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
350 fsidp->fsid_code = 0;
351 fsidp->Fsid_dev.Minor = fhp[0];
352 fsidp->Fsid_dev.Major = fhp[1];
354 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
361 /* No numeric file system ID, so hash on the device-name */
362 if (sizeof(*fsidp) >= 14) {
363 if (sizeof(*fsidp) > 14)
364 memset((char *)fsidp, 0, sizeof(*fsidp));
365 /* just use the whole thing */
366 memcpy((char *)fsidp, (char *)fh, 14);
369 uint32_t tempa[4]; /* at least 16 bytes, maybe more */
371 memset((char *)tempa, 0, sizeof(tempa));
372 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
373 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
374 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
375 fsidp->fsid_code = 0;
378 /* VMS file ID is: (RVN, FidHi, FidLo) */
379 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
381 /* Caller must save (and null-terminate?) this value */
383 *fsnamep = (char *)&(fhp[1]);
390 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
391 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
392 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
394 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
401 fsidp->Fsid_dev.Major = fhp[0];
402 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
403 fsidp->Fsid_dev.Minor = temp;
404 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
406 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
415 for (i = 0; i < 32; i++)
416 (void)fprintf(stderr, "%x.", fhp[i]);
417 (void)fprintf(stderr, "\n");
419 /* Save the actual handle, so it can be display with -u */
420 for (i = 0; i < 32; i++)
421 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
423 /* XXX for now, give "bogus" values to aid debugging */
424 fsidp->fsid_code = 0;
425 fsidp->Fsid_dev.Minor = 257;
426 fsidp->Fsid_dev.Major = 257;
429 /* display will show this string instead of (257,257) */
431 *fsnamep = "Unknown";
434 *osnamep = "Unknown";
441 * Is this a VMS UCX file handle?
443 * (1) leading code byte [XXX not yet]
444 * (2) followed by string of printing chars & spaces
445 * (3) followed by string of nulls
448 is_UCX(const unsigned char *fhp)
453 for (i = 1; i < 14; i++) {
454 if (ND_ISPRINT(fhp[i])) {
460 else if (fhp[i] == 0) {