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-ctype.h"
53
54 #include "netdissect.h"
55 #include "extract.h"
56 #include "nfsfh.h"
57
58 /*
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.
63 *
64 * The file handle is parsed into our internal representation of a
65 * file-system id, and an internal representation of an inode-number.
66 */
67
68 #define FHT_UNKNOWN 0
69 #define FHT_AUSPEX 1
70 #define FHT_DECOSF 2
71 #define FHT_IRIX4 3
72 #define FHT_IRIX5 4
73 #define FHT_SUNOS3 5
74 #define FHT_SUNOS4 6
75 #define FHT_ULTRIX 7
76 #define FHT_VMSUCX 8
77 #define FHT_SUNOS5 9
78 #define FHT_AIX32 10
79 #define FHT_HPUX9 11
80 #define FHT_BSD44 12
81
82 static int is_UCX(netdissect_options *, const unsigned char *, u_int);
83
84 void
Parse_fh(netdissect_options * ndo,const unsigned char * fh,u_int len,my_fsid * fsidp,uint32_t * inop,const char ** osnamep,const char ** fsnamep,int ourself)85 Parse_fh(netdissect_options *ndo, const unsigned char *fh, u_int len,
86 my_fsid *fsidp, uint32_t *inop,
87 const char **osnamep, /* if non-NULL, return OS name here */
88 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
89 int ourself) /* true if file handle was generated on this host */
90 {
91 const unsigned char *fhp = fh;
92 uint32_t temp;
93 int fhtype = FHT_UNKNOWN;
94 u_int i;
95
96 /*
97 * Require at least 16 bytes of file handle; it's variable-length
98 * in NFSv3. "len" is in units of 32-bit words, not bytes.
99 */
100 if (len < 16/4)
101 fhtype = FHT_UNKNOWN;
102 else {
103 if (ourself) {
104 /* File handle generated on this host, no need for guessing */
105 #if defined(IRIX40)
106 fhtype = FHT_IRIX4;
107 #endif
108 #if defined(IRIX50)
109 fhtype = FHT_IRIX5;
110 #endif
111 #if defined(IRIX51)
112 fhtype = FHT_IRIX5;
113 #endif
114 #if defined(SUNOS4)
115 fhtype = FHT_SUNOS4;
116 #endif
117 #if defined(SUNOS5)
118 fhtype = FHT_SUNOS5;
119 #endif
120 #if defined(ultrix)
121 fhtype = FHT_ULTRIX;
122 #endif
123 #if defined(__osf__)
124 fhtype = FHT_DECOSF;
125 #endif
126 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
127 || defined(__OpenBSD__)
128 fhtype = FHT_BSD44;
129 #endif
130 }
131 /*
132 * This is basically a big decision tree
133 */
134 else if ((GET_U_1(fhp) == 0) && (GET_U_1(fhp + 1) == 0)) {
135 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
136 /* probably rules out HP-UX, AIX unless they allow major=0 */
137 if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) {
138 /* bytes[2,3] == (0,0); must be Auspex */
139 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
140 fhtype = FHT_AUSPEX;
141 }
142 else {
143 /*
144 * bytes[2,3] != (0,0); rules out Auspex, could be
145 * DECOSF, SUNOS4, or IRIX4
146 */
147 if ((GET_U_1(fhp + 4) != 0) && (GET_U_1(fhp + 5) == 0) &&
148 (GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
149 /* seems to be DECOSF, with minor == 0 */
150 fhtype = FHT_DECOSF;
151 }
152 else {
153 /* could be SUNOS4 or IRIX4 */
154 /* XXX the test of fhp[5] == 8 could be wrong */
155 if ((GET_U_1(fhp + 4) == 0) && (GET_U_1(fhp + 5) == 8) && (GET_U_1(fhp + 6) == 0) &&
156 (GET_U_1(fhp + 7) == 0)) {
157 /* looks like a length, not a file system typecode */
158 fhtype = FHT_IRIX4;
159 }
160 else {
161 /* by elimination */
162 fhtype = FHT_SUNOS4;
163 }
164 }
165 }
166 }
167 else {
168 /*
169 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
170 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
171 * could be AIX, HP-UX
172 */
173 if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) {
174 /*
175 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
176 * (unless the exported device name is just one letter!),
177 * could be Ultrix, IRIX5, AIX, or SUNOS5
178 * might be HP-UX (depends on their values for minor devs)
179 */
180 if ((GET_U_1(fhp + 6) == 0) && (GET_U_1(fhp + 7) == 0)) {
181 fhtype = FHT_BSD44;
182 }
183 /*XXX we probably only need to test of these two bytes */
184 else if ((len >= 24/4) && (GET_U_1(fhp + 21) == 0) && (GET_U_1(fhp + 23) == 0)) {
185 fhtype = FHT_ULTRIX;
186 }
187 else {
188 /* Could be SUNOS5/IRIX5, maybe AIX */
189 /* XXX no obvious difference between SUNOS5 and IRIX5 */
190 if (GET_U_1(fhp + 9) == 10)
191 fhtype = FHT_SUNOS5;
192 /* XXX what about AIX? */
193 }
194 }
195 else {
196 /*
197 * bytes[2,3] != (0,0); rules out Ultrix, could be
198 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
199 */
200 if ((GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
201 fhtype = FHT_DECOSF;
202 }
203 else if ((GET_U_1(fhp + 8) == 0) && (GET_U_1(fhp + 9) == 10)) {
204 /* could be SUNOS5/IRIX5, AIX, HP-UX */
205 if ((GET_U_1(fhp + 7) == 0) && (GET_U_1(fhp + 6) == 0) &&
206 (GET_U_1(fhp + 5) == 0) && (GET_U_1(fhp + 4) == 0)) {
207 /* XXX is this always true of HP-UX? */
208 fhtype = FHT_HPUX9;
209 }
210 else if (GET_U_1(fhp + 7) == 2) {
211 /* This would be MNT_NFS on AIX, which is impossible */
212 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
213 }
214 else {
215 /*
216 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
217 * XXX see any way to disambiguate these, so
218 * XXX I'm going with the more likely guess.
219 * XXX Sorry, Big Blue.
220 */
221 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
222 }
223 }
224 else {
225 if (is_UCX(ndo, fhp, len)) {
226 fhtype = FHT_VMSUCX;
227 }
228 else {
229 fhtype = FHT_UNKNOWN;
230 }
231 }
232 }
233 }
234 }
235
236 /* XXX still needs to handle SUNOS3 */
237
238 switch (fhtype) {
239 case FHT_AUSPEX:
240 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 7);
241 fsidp->Fsid_dev.Major = GET_U_1(fhp + 6);
242 fsidp->fsid_code = 0;
243
244 *inop = GET_BE_U_4(fhp + 12);
245
246 if (osnamep)
247 *osnamep = "Auspex";
248 break;
249
250 case FHT_BSD44:
251 fsidp->Fsid_dev.Minor = GET_U_1(fhp);
252 fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
253 fsidp->fsid_code = 0;
254
255 *inop = GET_LE_U_4(fhp + 12);
256
257 if (osnamep)
258 *osnamep = "BSD 4.4";
259 break;
260
261 case FHT_DECOSF:
262 fsidp->fsid_code = GET_LE_U_4(fhp + 4);
263 /* XXX could ignore 3 high-order bytes */
264
265 temp = GET_LE_U_4(fhp);
266 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
267 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
268
269 *inop = GET_LE_U_4(fhp + 12);
270 if (osnamep)
271 *osnamep = "OSF";
272 break;
273
274 case FHT_IRIX4:
275 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3);
276 fsidp->Fsid_dev.Major = GET_U_1(fhp + 2);
277 fsidp->fsid_code = 0;
278
279 *inop = GET_BE_U_4(fhp + 8);
280
281 if (osnamep)
282 *osnamep = "IRIX4";
283 break;
284
285 case FHT_IRIX5:
286 fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2);
287 fsidp->Fsid_dev.Major = GET_BE_U_2(fhp);
288 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
289
290 *inop = GET_BE_U_4(fhp + 12);
291
292 if (osnamep)
293 *osnamep = "IRIX5";
294 break;
295
296 #ifdef notdef
297 case FHT_SUNOS3:
298 /*
299 * XXX - none of the heuristics above return this.
300 * Are there any SunOS 3.x systems around to care about?
301 */
302 if (osnamep)
303 *osnamep = "SUNOS3";
304 break;
305 #endif
306
307 case FHT_SUNOS4:
308 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3);
309 fsidp->Fsid_dev.Major = GET_U_1(fhp + 2);
310 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
311
312 *inop = GET_BE_U_4(fhp + 12);
313
314 if (osnamep)
315 *osnamep = "SUNOS4";
316 break;
317
318 case FHT_SUNOS5:
319 temp = GET_BE_U_2(fhp);
320 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
321 temp = GET_BE_U_3(fhp + 1);
322 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
323 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
324
325 *inop = GET_BE_U_4(fhp + 12);
326
327 if (osnamep)
328 *osnamep = "SUNOS5";
329 break;
330
331 case FHT_ULTRIX:
332 fsidp->fsid_code = 0;
333 fsidp->Fsid_dev.Minor = GET_U_1(fhp);
334 fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
335
336 temp = GET_LE_U_4(fhp + 4);
337 *inop = temp;
338 if (osnamep)
339 *osnamep = "Ultrix";
340 break;
341
342 case FHT_VMSUCX:
343 /* No numeric file system ID, so hash on the device-name */
344 if (sizeof(*fsidp) >= 14) {
345 if (sizeof(*fsidp) > 14)
346 memset((char *)fsidp, 0, sizeof(*fsidp));
347 /* just use the whole thing */
348 memcpy((char *)fsidp, (const char *)fh, 14);
349 }
350 else {
351 uint32_t tempa[4]; /* at least 16 bytes, maybe more */
352
353 memset((char *)tempa, 0, sizeof(tempa));
354 memcpy((char *)tempa, (const char *)fh, 14); /* ensure alignment */
355 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
356 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
357 fsidp->fsid_code = 0;
358 }
359
360 /* VMS file ID is: (RVN, FidHi, FidLo) */
361 *inop = (((uint32_t) GET_U_1(fhp + 26)) << 24) |
362 (((uint32_t) GET_U_1(fhp + 27)) << 16) |
363 (GET_LE_U_2(fhp + 22) << 0);
364
365 /* Caller must save (and null-terminate?) this value */
366 if (fsnamep)
367 *fsnamep = (const char *)(fhp + 1);
368
369 if (osnamep)
370 *osnamep = "VMS";
371 break;
372
373 case FHT_AIX32:
374 fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2);
375 fsidp->Fsid_dev.Major = GET_BE_U_2(fhp);
376 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
377
378 *inop = GET_BE_U_4(fhp + 12);
379
380 if (osnamep)
381 *osnamep = "AIX32";
382 break;
383
384 case FHT_HPUX9:
385 fsidp->Fsid_dev.Major = GET_U_1(fhp);
386 temp = GET_BE_U_3(fhp + 1);
387 fsidp->Fsid_dev.Minor = temp;
388 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
389
390 *inop = GET_BE_U_4(fhp + 12);
391
392 if (osnamep)
393 *osnamep = "HPUX9";
394 break;
395
396 case FHT_UNKNOWN:
397 #ifdef DEBUG
398 /* XXX debugging */
399 for (i = 0; i < len*4; i++)
400 (void)fprintf(stderr, "%x.", GET_U_1(fhp + i));
401 (void)fprintf(stderr, "\n");
402 #endif
403 /* Save the actual handle, so it can be display with -u */
404 for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
405 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X",
406 GET_U_1(fhp + i));
407 fsidp->Opaque_Handle[i*2] = '\0';
408
409 /* XXX for now, give "bogus" values to aid debugging */
410 fsidp->fsid_code = 0;
411 fsidp->Fsid_dev.Minor = 257;
412 fsidp->Fsid_dev.Major = 257;
413 *inop = 1;
414
415 /* display will show this string instead of (257,257) */
416 if (fsnamep)
417 *fsnamep = "Unknown";
418
419 if (osnamep)
420 *osnamep = "Unknown";
421 break;
422
423 }
424 }
425
426 /*
427 * Is this a VMS UCX file handle?
428 * Check for:
429 * (1) leading code byte [XXX not yet]
430 * (2) followed by string of printing chars & spaces
431 * (3) followed by string of nulls
432 */
433 static int
is_UCX(netdissect_options * ndo,const unsigned char * fhp,u_int len)434 is_UCX(netdissect_options *ndo, const unsigned char *fhp, u_int len)
435 {
436 u_int i;
437 int seen_null = 0;
438
439 /*
440 * Require at least 28 bytes of file handle; it's variable-length
441 * in NFSv3. "len" is in units of 32-bit words, not bytes.
442 */
443 if (len < 28/4)
444 return(0);
445
446 for (i = 1; i < 14; i++) {
447 if (ND_ASCII_ISPRINT(GET_U_1(fhp + i))) {
448 if (seen_null)
449 return(0);
450 else
451 continue;
452 }
453 else if (GET_U_1(fhp + i) == 0) {
454 seen_null = 1;
455 continue;
456 }
457 else
458 return(0);
459 }
460
461 return(1);
462 }
463