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 #ifdef HAVE_CONFIG_H
44 #include "config.h"
45 #endif
46
47 #include <netdissect-stdinc.h>
48
49 #include <stdio.h>
50 #include <string.h>
51
52 #include "netdissect.h"
53 #include "nfsfh.h"
54
55 /*
56 * This routine attempts to parse a file handle (in network byte order),
57 * using heuristics to guess what kind of format it is in. See the
58 * file "fhandle_layouts" for a detailed description of the various
59 * patterns we know about.
60 *
61 * The file handle is parsed into our internal representation of a
62 * file-system id, and an internal representation of an inode-number.
63 */
64
65 #define FHT_UNKNOWN 0
66 #define FHT_AUSPEX 1
67 #define FHT_DECOSF 2
68 #define FHT_IRIX4 3
69 #define FHT_IRIX5 4
70 #define FHT_SUNOS3 5
71 #define FHT_SUNOS4 6
72 #define FHT_ULTRIX 7
73 #define FHT_VMSUCX 8
74 #define FHT_SUNOS5 9
75 #define FHT_AIX32 10
76 #define FHT_HPUX9 11
77 #define FHT_BSD44 12
78
79 #ifdef ultrix
80 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
81 #define XFF(x) ((uint32_t)(x))
82 #else
83 #define XFF(x) (x)
84 #endif
85
86 #define make_uint32(msb,b,c,lsb)\
87 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
88
89 #define make_uint24(msb,b, lsb)\
90 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
91
92 #define make_uint16(msb,lsb)\
93 (XFF(lsb) + (XFF(msb)<<8))
94
95 #ifdef __alpha
96 /* or other 64-bit systems */
97 #define make_uint48(msb,b,c,d,e,lsb)\
98 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
99 #else
100 /* on 32-bit systems ignore high-order bits */
101 #define make_uint48(msb,b,c,d,e,lsb)\
102 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
103 #endif
104
105 static int is_UCX(const unsigned char *, u_int);
106
107 void
Parse_fh(register const unsigned char * fh,u_int len,my_fsid * fsidp,uint32_t * inop,const char ** osnamep,const char ** fsnamep,int ourself)108 Parse_fh(register const unsigned char *fh, u_int len, my_fsid *fsidp,
109 uint32_t *inop,
110 const char **osnamep, /* if non-NULL, return OS name here */
111 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
112 int ourself) /* true if file handle was generated on this host */
113 {
114 register const unsigned char *fhp = fh;
115 uint32_t temp;
116 int fhtype = FHT_UNKNOWN;
117 u_int i;
118
119 /*
120 * Require at least 16 bytes of file handle; it's variable-length
121 * in NFSv3. "len" is in units of 32-bit words, not bytes.
122 */
123 if (len < 16/4)
124 fhtype = FHT_UNKNOWN;
125 else {
126 if (ourself) {
127 /* File handle generated on this host, no need for guessing */
128 #if defined(IRIX40)
129 fhtype = FHT_IRIX4;
130 #endif
131 #if defined(IRIX50)
132 fhtype = FHT_IRIX5;
133 #endif
134 #if defined(IRIX51)
135 fhtype = FHT_IRIX5;
136 #endif
137 #if defined(SUNOS4)
138 fhtype = FHT_SUNOS4;
139 #endif
140 #if defined(SUNOS5)
141 fhtype = FHT_SUNOS5;
142 #endif
143 #if defined(ultrix)
144 fhtype = FHT_ULTRIX;
145 #endif
146 #if defined(__osf__)
147 fhtype = FHT_DECOSF;
148 #endif
149 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
150 || defined(__OpenBSD__)
151 fhtype = FHT_BSD44;
152 #endif
153 }
154 /*
155 * This is basically a big decision tree
156 */
157 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
158 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
159 /* probably rules out HP-UX, AIX unless they allow major=0 */
160 if ((fhp[2] == 0) && (fhp[3] == 0)) {
161 /* bytes[2,3] == (0,0); must be Auspex */
162 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
163 fhtype = FHT_AUSPEX;
164 }
165 else {
166 /*
167 * bytes[2,3] != (0,0); rules out Auspex, could be
168 * DECOSF, SUNOS4, or IRIX4
169 */
170 if ((fhp[4] != 0) && (fhp[5] == 0) &&
171 (fhp[8] == 12) && (fhp[9] == 0)) {
172 /* seems to be DECOSF, with minor == 0 */
173 fhtype = FHT_DECOSF;
174 }
175 else {
176 /* could be SUNOS4 or IRIX4 */
177 /* XXX the test of fhp[5] == 8 could be wrong */
178 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
179 (fhp[7] == 0)) {
180 /* looks like a length, not a file system typecode */
181 fhtype = FHT_IRIX4;
182 }
183 else {
184 /* by elimination */
185 fhtype = FHT_SUNOS4;
186 }
187 }
188 }
189 }
190 else {
191 /*
192 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
193 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
194 * could be AIX, HP-UX
195 */
196 if ((fhp[2] == 0) && (fhp[3] == 0)) {
197 /*
198 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
199 * (unless the exported device name is just one letter!),
200 * could be Ultrix, IRIX5, AIX, or SUNOS5
201 * might be HP-UX (depends on their values for minor devs)
202 */
203 if ((fhp[6] == 0) && (fhp[7] == 0)) {
204 fhtype = FHT_BSD44;
205 }
206 /*XXX we probably only need to test of these two bytes */
207 else if ((len >= 24/4) && (fhp[21] == 0) && (fhp[23] == 0)) {
208 fhtype = FHT_ULTRIX;
209 }
210 else {
211 /* Could be SUNOS5/IRIX5, maybe AIX */
212 /* XXX no obvious difference between SUNOS5 and IRIX5 */
213 if (fhp[9] == 10)
214 fhtype = FHT_SUNOS5;
215 /* XXX what about AIX? */
216 }
217 }
218 else {
219 /*
220 * bytes[2,3] != (0,0); rules out Ultrix, could be
221 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
222 */
223 if ((fhp[8] == 12) && (fhp[9] == 0)) {
224 fhtype = FHT_DECOSF;
225 }
226 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
227 /* could be SUNOS5/IRIX5, AIX, HP-UX */
228 if ((fhp[7] == 0) && (fhp[6] == 0) &&
229 (fhp[5] == 0) && (fhp[4] == 0)) {
230 /* XXX is this always true of HP-UX? */
231 fhtype = FHT_HPUX9;
232 }
233 else if (fhp[7] == 2) {
234 /* This would be MNT_NFS on AIX, which is impossible */
235 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
236 }
237 else {
238 /*
239 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
240 * XXX see any way to disambiguate these, so
241 * XXX I'm going with the more likely guess.
242 * XXX Sorry, Big Blue.
243 */
244 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
245 }
246 }
247 else {
248 if (is_UCX(fhp, len)) {
249 fhtype = FHT_VMSUCX;
250 }
251 else {
252 fhtype = FHT_UNKNOWN;
253 }
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, (const char *)fh, 14);
372 }
373 else {
374 uint32_t tempa[4]; /* at least 16 bytes, maybe more */
375
376 memset((char *)tempa, 0, sizeof(tempa));
377 memcpy((char *)tempa, (const 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 = (const 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 < len*4; 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 < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
426 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
427 fsidp->Opaque_Handle[i*2] = '\0';
428
429 /* XXX for now, give "bogus" values to aid debugging */
430 fsidp->fsid_code = 0;
431 fsidp->Fsid_dev.Minor = 257;
432 fsidp->Fsid_dev.Major = 257;
433 *inop = 1;
434
435 /* display will show this string instead of (257,257) */
436 if (fsnamep)
437 *fsnamep = "Unknown";
438
439 if (osnamep)
440 *osnamep = "Unknown";
441 break;
442
443 }
444 }
445
446 /*
447 * Is this a VMS UCX file handle?
448 * Check for:
449 * (1) leading code byte [XXX not yet]
450 * (2) followed by string of printing chars & spaces
451 * (3) followed by string of nulls
452 */
453 static int
is_UCX(const unsigned char * fhp,u_int len)454 is_UCX(const unsigned char *fhp, u_int len)
455 {
456 register u_int i;
457 int seen_null = 0;
458
459 /*
460 * Require at least 28 bytes of file handle; it's variable-length
461 * in NFSv3. "len" is in units of 32-bit words, not bytes.
462 */
463 if (len < 28/4)
464 return(0);
465
466 for (i = 1; i < 14; i++) {
467 if (ND_ISPRINT(fhp[i])) {
468 if (seen_null)
469 return(0);
470 else
471 continue;
472 }
473 else if (fhp[i] == 0) {
474 seen_null = 1;
475 continue;
476 }
477 else
478 return(0);
479 }
480
481 return(1);
482 }
483