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 #include <config.h>
44
45 #include "netdissect-stdinc.h"
46
47 #include <stdio.h>
48 #include <string.h>
49 #include <limits.h>
50
51 #include "netdissect-ctype.h"
52
53 #include "netdissect.h"
54 #include "extract.h"
55 #include "nfsfh.h"
56
57 /*
58 * This routine attempts to parse a file handle (in network byte order),
59 * using heuristics to guess what kind of format it is in. See the
60 * file "fhandle_layouts" for a detailed description of the various
61 * patterns we know about.
62 *
63 * The file handle is parsed into our internal representation of a
64 * file-system id, and an internal representation of an inode-number.
65 */
66
67 #define FHT_UNKNOWN 0
68 #define FHT_AUSPEX 1
69 #define FHT_DECOSF 2
70 #define FHT_IRIX4 3
71 #define FHT_IRIX5 4
72 #define FHT_SUNOS3 5
73 #define FHT_SUNOS4 6
74 #define FHT_ULTRIX 7
75 #define FHT_VMSUCX 8
76 #define FHT_SUNOS5 9
77 #define FHT_AIX32 10
78 #define FHT_HPUX9 11
79 #define FHT_BSD44 12
80
81 static int is_UCX(netdissect_options *, const unsigned char *, u_int);
82
83 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)84 Parse_fh(netdissect_options *ndo, const unsigned char *fh, u_int len,
85 my_fsid *fsidp, uint32_t *inop,
86 const char **osnamep, /* if non-NULL, return OS name here */
87 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
88 int ourself) /* true if file handle was generated on this host */
89 {
90 const unsigned char *fhp = fh;
91 uint32_t temp;
92 int fhtype = FHT_UNKNOWN;
93 u_int i;
94
95 /*
96 * Require at least 16 bytes of file handle; it's variable-length
97 * in NFSv3. "len" is in units of 32-bit words, not bytes.
98 */
99 if (len < 16/4)
100 fhtype = FHT_UNKNOWN;
101 else {
102 if (ourself) {
103 /* File handle generated on this host, no need for guessing */
104 #if defined(IRIX40)
105 fhtype = FHT_IRIX4;
106 #endif
107 #if defined(IRIX50)
108 fhtype = FHT_IRIX5;
109 #endif
110 #if defined(IRIX51)
111 fhtype = FHT_IRIX5;
112 #endif
113 #if defined(SUNOS4)
114 fhtype = FHT_SUNOS4;
115 #endif
116 #if defined(SUNOS5)
117 fhtype = FHT_SUNOS5;
118 #endif
119 #if defined(ultrix)
120 fhtype = FHT_ULTRIX;
121 #endif
122 #if defined(__osf__)
123 fhtype = FHT_DECOSF;
124 #endif
125 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
126 || defined(__OpenBSD__)
127 fhtype = FHT_BSD44;
128 #endif
129 }
130 /*
131 * This is basically a big decision tree
132 */
133 else if ((GET_U_1(fhp) == 0) && (GET_U_1(fhp + 1) == 0)) {
134 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
135 /* probably rules out HP-UX, AIX unless they allow major=0 */
136 if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) {
137 /* bytes[2,3] == (0,0); must be Auspex */
138 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
139 fhtype = FHT_AUSPEX;
140 } else {
141 /*
142 * bytes[2,3] != (0,0); rules out Auspex, could be
143 * DECOSF, SUNOS4, or IRIX4
144 */
145 if ((GET_U_1(fhp + 4) != 0) && (GET_U_1(fhp + 5) == 0) &&
146 (GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
147 /* seems to be DECOSF, with minor == 0 */
148 fhtype = FHT_DECOSF;
149 } else {
150 /* could be SUNOS4 or IRIX4 */
151 /* XXX the test of fhp[5] == 8 could be wrong */
152 if ((GET_U_1(fhp + 4) == 0) && (GET_U_1(fhp + 5) == 8) && (GET_U_1(fhp + 6) == 0) &&
153 (GET_U_1(fhp + 7) == 0)) {
154 /* looks like a length, not a file system typecode */
155 fhtype = FHT_IRIX4;
156 } else {
157 /* by elimination */
158 fhtype = FHT_SUNOS4;
159 }
160 }
161 }
162 } else {
163 /*
164 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
165 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
166 * could be AIX, HP-UX
167 */
168 if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) {
169 /*
170 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
171 * (unless the exported device name is just one letter!),
172 * could be Ultrix, IRIX5, AIX, or SUNOS5
173 * might be HP-UX (depends on their values for minor devs)
174 */
175 if ((GET_U_1(fhp + 6) == 0) && (GET_U_1(fhp + 7) == 0)) {
176 fhtype = FHT_BSD44;
177 }
178 /*XXX we probably only need to test of these two bytes */
179 else if ((len >= 24/4) && (GET_U_1(fhp + 21) == 0) && (GET_U_1(fhp + 23) == 0)) {
180 fhtype = FHT_ULTRIX;
181 } else {
182 /* Could be SUNOS5/IRIX5, maybe AIX */
183 /* XXX no obvious difference between SUNOS5 and IRIX5 */
184 if (GET_U_1(fhp + 9) == 10)
185 fhtype = FHT_SUNOS5;
186 /* XXX what about AIX? */
187 }
188 } else {
189 /*
190 * bytes[2,3] != (0,0); rules out Ultrix, could be
191 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
192 */
193 if ((GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) {
194 fhtype = FHT_DECOSF;
195 } else if ((GET_U_1(fhp + 8) == 0) && (GET_U_1(fhp + 9) == 10)) {
196 /* could be SUNOS5/IRIX5, AIX, HP-UX */
197 if ((GET_U_1(fhp + 7) == 0) && (GET_U_1(fhp + 6) == 0) &&
198 (GET_U_1(fhp + 5) == 0) && (GET_U_1(fhp + 4) == 0)) {
199 /* XXX is this always true of HP-UX? */
200 fhtype = FHT_HPUX9;
201 } else if (GET_U_1(fhp + 7) == 2) {
202 /* This would be MNT_NFS on AIX, which is impossible */
203 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
204 } else {
205 /*
206 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
207 * XXX see any way to disambiguate these, so
208 * XXX I'm going with the more likely guess.
209 * XXX Sorry, Big Blue.
210 */
211 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
212 }
213 } else {
214 if (is_UCX(ndo, fhp, len)) {
215 fhtype = FHT_VMSUCX;
216 } else {
217 fhtype = FHT_UNKNOWN;
218 }
219 }
220 }
221 }
222 }
223
224 /* XXX still needs to handle SUNOS3 */
225
226 switch (fhtype) {
227 case FHT_AUSPEX:
228 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 7);
229 fsidp->Fsid_dev.Major = GET_U_1(fhp + 6);
230 fsidp->fsid_code = 0;
231
232 *inop = GET_BE_U_4(fhp + 12);
233
234 if (osnamep)
235 *osnamep = "Auspex";
236 break;
237
238 case FHT_BSD44:
239 fsidp->Fsid_dev.Minor = GET_U_1(fhp);
240 fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
241 fsidp->fsid_code = 0;
242
243 *inop = GET_LE_U_4(fhp + 12);
244
245 if (osnamep)
246 *osnamep = "BSD 4.4";
247 break;
248
249 case FHT_DECOSF:
250 fsidp->fsid_code = GET_LE_U_4(fhp + 4);
251 /* XXX could ignore 3 high-order bytes */
252
253 temp = GET_LE_U_4(fhp);
254 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
255 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
256
257 *inop = GET_LE_U_4(fhp + 12);
258 if (osnamep)
259 *osnamep = "OSF";
260 break;
261
262 case FHT_IRIX4:
263 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3);
264 fsidp->Fsid_dev.Major = GET_U_1(fhp + 2);
265 fsidp->fsid_code = 0;
266
267 *inop = GET_BE_U_4(fhp + 8);
268
269 if (osnamep)
270 *osnamep = "IRIX4";
271 break;
272
273 case FHT_IRIX5:
274 fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2);
275 fsidp->Fsid_dev.Major = GET_BE_U_2(fhp);
276 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
277
278 *inop = GET_BE_U_4(fhp + 12);
279
280 if (osnamep)
281 *osnamep = "IRIX5";
282 break;
283
284 #ifdef notdef
285 case FHT_SUNOS3:
286 /*
287 * XXX - none of the heuristics above return this.
288 * Are there any SunOS 3.x systems around to care about?
289 */
290 if (osnamep)
291 *osnamep = "SUNOS3";
292 break;
293 #endif
294
295 case FHT_SUNOS4:
296 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3);
297 fsidp->Fsid_dev.Major = GET_U_1(fhp + 2);
298 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
299
300 *inop = GET_BE_U_4(fhp + 12);
301
302 if (osnamep)
303 *osnamep = "SUNOS4";
304 break;
305
306 case FHT_SUNOS5:
307 temp = GET_BE_U_2(fhp);
308 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
309 temp = GET_BE_U_3(fhp + 1);
310 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
311 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
312
313 *inop = GET_BE_U_4(fhp + 12);
314
315 if (osnamep)
316 *osnamep = "SUNOS5";
317 break;
318
319 case FHT_ULTRIX:
320 fsidp->fsid_code = 0;
321 fsidp->Fsid_dev.Minor = GET_U_1(fhp);
322 fsidp->Fsid_dev.Major = GET_U_1(fhp + 1);
323
324 temp = GET_LE_U_4(fhp + 4);
325 *inop = temp;
326 if (osnamep)
327 *osnamep = "Ultrix";
328 break;
329
330 case FHT_VMSUCX:
331 /* No numeric file system ID, so hash on the device-name */
332 if (sizeof(*fsidp) >= 14) {
333 if (sizeof(*fsidp) > 14)
334 memset((char *)fsidp, 0, sizeof(*fsidp));
335 /* just use the whole thing */
336 memcpy((char *)fsidp, (const char *)fh, 14);
337 } else {
338 uint32_t tempa[4]; /* at least 16 bytes, maybe more */
339
340 memset((char *)tempa, 0, sizeof(tempa));
341 memcpy((char *)tempa, (const char *)fh, 14); /* ensure alignment */
342 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
343 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
344 fsidp->fsid_code = 0;
345 }
346
347 /* VMS file ID is: (RVN, FidHi, FidLo) */
348 *inop = (((uint32_t) GET_U_1(fhp + 26)) << 24) |
349 (((uint32_t) GET_U_1(fhp + 27)) << 16) |
350 (GET_LE_U_2(fhp + 22) << 0);
351
352 /* Caller must save (and null-terminate?) this value */
353 if (fsnamep)
354 *fsnamep = (const char *)(fhp + 1);
355
356 if (osnamep)
357 *osnamep = "VMS";
358 break;
359
360 case FHT_AIX32:
361 fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2);
362 fsidp->Fsid_dev.Major = GET_BE_U_2(fhp);
363 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
364
365 *inop = GET_BE_U_4(fhp + 12);
366
367 if (osnamep)
368 *osnamep = "AIX32";
369 break;
370
371 case FHT_HPUX9:
372 fsidp->Fsid_dev.Major = GET_U_1(fhp);
373 temp = GET_BE_U_3(fhp + 1);
374 fsidp->Fsid_dev.Minor = temp;
375 fsidp->fsid_code = GET_BE_U_4(fhp + 4);
376
377 *inop = GET_BE_U_4(fhp + 12);
378
379 if (osnamep)
380 *osnamep = "HPUX9";
381 break;
382
383 case FHT_UNKNOWN:
384 #ifdef DEBUG
385 /* XXX debugging */
386 for (i = 0; i < len*4; i++)
387 (void)fprintf(stderr, "%x.", GET_U_1(fhp + i));
388 (void)fprintf(stderr, "\n");
389 #endif
390 /* Save the actual handle, so it can be display with -u */
391 /* XXX really ? When -u is used this function is not called */
392 for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
393 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X",
394 GET_U_1(fhp + i));
395 fsidp->Opaque_Handle[i*2] = '\0';
396
397 /* XXX for now, give "bogus" values to aid debugging */
398 fsidp->fsid_code = 0;
399 fsidp->Fsid_dev.Minor = UINT_MAX;
400 fsidp->Fsid_dev.Major = UINT_MAX;
401 *inop = 1;
402
403 /* display will show this string instead of (UINT_MAX,UINT_MAX) */
404 /* XXX really ? */
405 if (fsnamep)
406 *fsnamep = "Unknown";
407
408 if (osnamep)
409 *osnamep = "Unknown";
410 break;
411
412 }
413 }
414
415 /*
416 * Is this a VMS UCX file handle?
417 * Check for:
418 * (1) leading code byte [XXX not yet]
419 * (2) followed by string of printing chars & spaces
420 * (3) followed by string of nulls
421 */
422 static int
is_UCX(netdissect_options * ndo,const unsigned char * fhp,u_int len)423 is_UCX(netdissect_options *ndo, const unsigned char *fhp, u_int len)
424 {
425 u_int i;
426 int seen_null = 0;
427
428 /*
429 * Require at least 28 bytes of file handle; it's variable-length
430 * in NFSv3. "len" is in units of 32-bit words, not bytes.
431 */
432 if (len < 28/4)
433 return(0);
434
435 for (i = 1; i < 14; i++) {
436 if (ND_ASCII_ISPRINT(GET_U_1(fhp + i))) {
437 if (seen_null)
438 return(0);
439 else
440 continue;
441 } else if (GET_U_1(fhp + i) == 0) {
442 seen_null = 1;
443 continue;
444 } else
445 return(0);
446 }
447
448 return(1);
449 }
450