1 /*
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.
5 *
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
10 * or modified versions, and any portions thereof, and both notices
11 * must appear in supporting documentation.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
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
21 * distribution.
22 *
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
28 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
29 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
30 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
31 * SOFTWARE.
32 */
33
34 /*
35 * parsenfsfh.c - portable parser for NFS file handles
36 * uses all sorts of heuristics
37 *
38 * Jeffrey C. Mogul
39 * Digital Equipment Corporation
40 * Western Research Laboratory
41 */
42
43 #ifndef lint
44 static const char rcsid[] _U_ =
45 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.29 2006-06-13 22:21:38 guy Exp $ (LBL)";
46 #endif
47
48 #ifdef HAVE_CONFIG_H
49 #include "config.h"
50 #endif
51
52 #include <tcpdump-stdinc.h>
53
54 #include <stdio.h>
55 #include <string.h>
56
57 #include "interface.h"
58 #include "nfsfh.h"
59
60 /*
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.
65 *
66 * The file handle is parsed into our internal representation of a
67 * file-system id, and an internal representation of an inode-number.
68 */
69
70 #define FHT_UNKNOWN 0
71 #define FHT_AUSPEX 1
72 #define FHT_DECOSF 2
73 #define FHT_IRIX4 3
74 #define FHT_IRIX5 4
75 #define FHT_SUNOS3 5
76 #define FHT_SUNOS4 6
77 #define FHT_ULTRIX 7
78 #define FHT_VMSUCX 8
79 #define FHT_SUNOS5 9
80 #define FHT_AIX32 10
81 #define FHT_HPUX9 11
82 #define FHT_BSD44 12
83
84 #ifdef ultrix
85 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
86 #define XFF(x) ((u_int32_t)(x))
87 #else
88 #define XFF(x) (x)
89 #endif
90
91 #define make_uint32(msb,b,c,lsb)\
92 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
93
94 #define make_uint24(msb,b, lsb)\
95 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
96
97 #define make_uint16(msb,lsb)\
98 (XFF(lsb) + (XFF(msb)<<8))
99
100 #ifdef __alpha
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))
104 #else
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))
108 #endif
109
110 static int is_UCX(const unsigned char *);
111
112 void
Parse_fh(fh,len,fsidp,inop,osnamep,fsnamep,ourself)113 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
114 register const unsigned char *fh;
115 int len _U_;
116 my_fsid *fsidp;
117 u_int32_t *inop;
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 */
121 {
122 register const unsigned char *fhp = fh;
123 u_int32_t temp;
124 int fhtype = FHT_UNKNOWN;
125 int i;
126
127 if (ourself) {
128 /* File handle generated on this host, no need for guessing */
129 #if defined(IRIX40)
130 fhtype = FHT_IRIX4;
131 #endif
132 #if defined(IRIX50)
133 fhtype = FHT_IRIX5;
134 #endif
135 #if defined(IRIX51)
136 fhtype = FHT_IRIX5;
137 #endif
138 #if defined(SUNOS4)
139 fhtype = FHT_SUNOS4;
140 #endif
141 #if defined(SUNOS5)
142 fhtype = FHT_SUNOS5;
143 #endif
144 #if defined(ultrix)
145 fhtype = FHT_ULTRIX;
146 #endif
147 #if defined(__osf__)
148 fhtype = FHT_DECOSF;
149 #endif
150 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
151 || defined(__OpenBSD__)
152 fhtype = FHT_BSD44;
153 #endif
154 }
155 /*
156 * This is basically a big decision tree
157 */
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? */
164 fhtype = FHT_AUSPEX;
165 }
166 else {
167 /*
168 * bytes[2,3] != (0,0); rules out Auspex, could be
169 * DECOSF, SUNOS4, or IRIX4
170 */
171 if ((fhp[4] != 0) && (fhp[5] == 0) &&
172 (fhp[8] == 12) && (fhp[9] == 0)) {
173 /* seems to be DECOSF, with minor == 0 */
174 fhtype = FHT_DECOSF;
175 }
176 else {
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) &&
180 (fhp[7] == 0)) {
181 /* looks like a length, not a file system typecode */
182 fhtype = FHT_IRIX4;
183 }
184 else {
185 /* by elimination */
186 fhtype = FHT_SUNOS4;
187 }
188 }
189 }
190 }
191 else {
192 /*
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
196 */
197 if ((fhp[2] == 0) && (fhp[3] == 0)) {
198 /*
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)
203 */
204 if ((fhp[6] == 0) && (fhp[7] == 0)) {
205 fhtype = FHT_BSD44;
206 }
207 /*XXX we probably only need to test of these two bytes */
208 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
209 fhtype = FHT_ULTRIX;
210 }
211 else {
212 /* Could be SUNOS5/IRIX5, maybe AIX */
213 /* XXX no obvious difference between SUNOS5 and IRIX5 */
214 if (fhp[9] == 10)
215 fhtype = FHT_SUNOS5;
216 /* XXX what about AIX? */
217 }
218 }
219 else {
220 /*
221 * bytes[2,3] != (0,0); rules out Ultrix, could be
222 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
223 */
224 if ((fhp[8] == 12) && (fhp[9] == 0)) {
225 fhtype = FHT_DECOSF;
226 }
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? */
232 fhtype = FHT_HPUX9;
233 }
234 else if (fhp[7] == 2) {
235 /* This would be MNT_NFS on AIX, which is impossible */
236 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
237 }
238 else {
239 /*
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.
244 */
245 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
246 }
247 }
248 else {
249 if (is_UCX(fhp)) {
250 fhtype = FHT_VMSUCX;
251 }
252 else {
253 fhtype = FHT_UNKNOWN;
254 }
255 }
256 }
257 }
258
259 /* XXX still needs to handle SUNOS3 */
260
261 switch (fhtype) {
262 case FHT_AUSPEX:
263 fsidp->Fsid_dev.Minor = fhp[7];
264 fsidp->Fsid_dev.Major = fhp[6];
265 fsidp->fsid_code = 0;
266
267 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
268
269 if (osnamep)
270 *osnamep = "Auspex";
271 break;
272
273 case FHT_BSD44:
274 fsidp->Fsid_dev.Minor = fhp[0];
275 fsidp->Fsid_dev.Major = fhp[1];
276 fsidp->fsid_code = 0;
277
278 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
279
280 if (osnamep)
281 *osnamep = "BSD 4.4";
282 break;
283
284 case FHT_DECOSF:
285 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
286 /* XXX could ignore 3 high-order bytes */
287
288 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
289 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
290 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
291
292 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
293 if (osnamep)
294 *osnamep = "OSF";
295 break;
296
297 case FHT_IRIX4:
298 fsidp->Fsid_dev.Minor = fhp[3];
299 fsidp->Fsid_dev.Major = fhp[2];
300 fsidp->fsid_code = 0;
301
302 *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
303
304 if (osnamep)
305 *osnamep = "IRIX4";
306 break;
307
308 case FHT_IRIX5:
309 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
310 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
311 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
312
313 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
314
315 if (osnamep)
316 *osnamep = "IRIX5";
317 break;
318
319 #ifdef notdef
320 case FHT_SUNOS3:
321 /*
322 * XXX - none of the heuristics above return this.
323 * Are there any SunOS 3.x systems around to care about?
324 */
325 if (osnamep)
326 *osnamep = "SUNOS3";
327 break;
328 #endif
329
330 case FHT_SUNOS4:
331 fsidp->Fsid_dev.Minor = fhp[3];
332 fsidp->Fsid_dev.Major = fhp[2];
333 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
334
335 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
336
337 if (osnamep)
338 *osnamep = "SUNOS4";
339 break;
340
341 case FHT_SUNOS5:
342 temp = make_uint16(fhp[0], fhp[1]);
343 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
344 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
345 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
346 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
347
348 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
349
350 if (osnamep)
351 *osnamep = "SUNOS5";
352 break;
353
354 case FHT_ULTRIX:
355 fsidp->fsid_code = 0;
356 fsidp->Fsid_dev.Minor = fhp[0];
357 fsidp->Fsid_dev.Major = fhp[1];
358
359 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
360 *inop = temp;
361 if (osnamep)
362 *osnamep = "Ultrix";
363 break;
364
365 case FHT_VMSUCX:
366 /* No numeric file system ID, so hash on the device-name */
367 if (sizeof(*fsidp) >= 14) {
368 if (sizeof(*fsidp) > 14)
369 memset((char *)fsidp, 0, sizeof(*fsidp));
370 /* just use the whole thing */
371 memcpy((char *)fsidp, (char *)fh, 14);
372 }
373 else {
374 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
375
376 memset((char *)tempa, 0, sizeof(tempa));
377 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
378 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
379 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
380 fsidp->fsid_code = 0;
381 }
382
383 /* VMS file ID is: (RVN, FidHi, FidLo) */
384 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
385
386 /* Caller must save (and null-terminate?) this value */
387 if (fsnamep)
388 *fsnamep = (char *)&(fhp[1]);
389
390 if (osnamep)
391 *osnamep = "VMS";
392 break;
393
394 case FHT_AIX32:
395 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
396 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
397 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
398
399 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
400
401 if (osnamep)
402 *osnamep = "AIX32";
403 break;
404
405 case FHT_HPUX9:
406 fsidp->Fsid_dev.Major = fhp[0];
407 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
408 fsidp->Fsid_dev.Minor = temp;
409 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
410
411 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
412
413 if (osnamep)
414 *osnamep = "HPUX9";
415 break;
416
417 case FHT_UNKNOWN:
418 #ifdef DEBUG
419 /* XXX debugging */
420 for (i = 0; i < 32; i++)
421 (void)fprintf(stderr, "%x.", fhp[i]);
422 (void)fprintf(stderr, "\n");
423 #endif
424 /* Save the actual handle, so it can be display with -u */
425 for (i = 0; i < 32; i++)
426 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
427
428 /* XXX for now, give "bogus" values to aid debugging */
429 fsidp->fsid_code = 0;
430 fsidp->Fsid_dev.Minor = 257;
431 fsidp->Fsid_dev.Major = 257;
432 *inop = 1;
433
434 /* display will show this string instead of (257,257) */
435 if (fsnamep)
436 *fsnamep = "Unknown";
437
438 if (osnamep)
439 *osnamep = "Unknown";
440 break;
441
442 }
443 }
444
445 /*
446 * Is this a VMS UCX file handle?
447 * Check for:
448 * (1) leading code byte [XXX not yet]
449 * (2) followed by string of printing chars & spaces
450 * (3) followed by string of nulls
451 */
452 static int
is_UCX(fhp)453 is_UCX(fhp)
454 const unsigned char *fhp;
455 {
456 register int i;
457 int seen_null = 0;
458
459 for (i = 1; i < 14; i++) {
460 if (ND_ISPRINT(fhp[i])) {
461 if (seen_null)
462 return(0);
463 else
464 continue;
465 }
466 else if (fhp[i] == 0) {
467 seen_null = 1;
468 continue;
469 }
470 else
471 return(0);
472 }
473
474 return(1);
475 }
476