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 <sys/cdefs.h>
44 #ifndef lint
45 __RCSID("$NetBSD: parsenfsfh.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
46 #endif
47
48 #define NETDISSECT_REWORKED
49 #ifdef HAVE_CONFIG_H
50 #include "config.h"
51 #endif
52
53 #include <tcpdump-stdinc.h>
54
55 #include <stdio.h>
56 #include <string.h>
57
58 #include "interface.h"
59 #include "nfsfh.h"
60
61 /*
62 * This routine attempts to parse a file handle (in network byte order),
63 * using heuristics to guess what kind of format it is in. See the
64 * file "fhandle_layouts" for a detailed description of the various
65 * patterns we know about.
66 *
67 * The file handle is parsed into our internal representation of a
68 * file-system id, and an internal representation of an inode-number.
69 */
70
71 #define FHT_UNKNOWN 0
72 #define FHT_AUSPEX 1
73 #define FHT_DECOSF 2
74 #define FHT_IRIX4 3
75 #define FHT_IRIX5 4
76 #define FHT_SUNOS3 5
77 #define FHT_SUNOS4 6
78 #define FHT_ULTRIX 7
79 #define FHT_VMSUCX 8
80 #define FHT_SUNOS5 9
81 #define FHT_AIX32 10
82 #define FHT_HPUX9 11
83 #define FHT_BSD44 12
84
85 #ifdef ultrix
86 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
87 #define XFF(x) ((uint32_t)(x))
88 #else
89 #define XFF(x) (x)
90 #endif
91
92 #define make_uint32(msb,b,c,lsb)\
93 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
94
95 #define make_uint24(msb,b, lsb)\
96 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
97
98 #define make_uint16(msb,lsb)\
99 (XFF(lsb) + (XFF(msb)<<8))
100
101 #ifdef __alpha
102 /* or other 64-bit systems */
103 #define make_uint48(msb,b,c,d,e,lsb)\
104 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
105 #else
106 /* on 32-bit systems ignore high-order bits */
107 #define make_uint48(msb,b,c,d,e,lsb)\
108 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
109 #endif
110
111 static int is_UCX(const unsigned char *);
112
113 void
Parse_fh(register const unsigned char * fh,int len _U_,my_fsid * fsidp,uint32_t * inop,const char ** osnamep,const char ** fsnamep,int ourself)114 Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp,
115 uint32_t *inop,
116 const char **osnamep, /* if non-NULL, return OS name here */
117 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
118 int ourself) /* true if file handle was generated on this host */
119 {
120 register const unsigned char *fhp = fh;
121 uint32_t temp;
122 int fhtype = FHT_UNKNOWN;
123 int i;
124
125 if (ourself) {
126 /* File handle generated on this host, no need for guessing */
127 #if defined(IRIX40)
128 fhtype = FHT_IRIX4;
129 #endif
130 #if defined(IRIX50)
131 fhtype = FHT_IRIX5;
132 #endif
133 #if defined(IRIX51)
134 fhtype = FHT_IRIX5;
135 #endif
136 #if defined(SUNOS4)
137 fhtype = FHT_SUNOS4;
138 #endif
139 #if defined(SUNOS5)
140 fhtype = FHT_SUNOS5;
141 #endif
142 #if defined(ultrix)
143 fhtype = FHT_ULTRIX;
144 #endif
145 #if defined(__osf__)
146 fhtype = FHT_DECOSF;
147 #endif
148 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
149 || defined(__OpenBSD__)
150 fhtype = FHT_BSD44;
151 #endif
152 }
153 /*
154 * This is basically a big decision tree
155 */
156 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
157 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
158 /* probably rules out HP-UX, AIX unless they allow major=0 */
159 if ((fhp[2] == 0) && (fhp[3] == 0)) {
160 /* bytes[2,3] == (0,0); must be Auspex */
161 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
162 fhtype = FHT_AUSPEX;
163 }
164 else {
165 /*
166 * bytes[2,3] != (0,0); rules out Auspex, could be
167 * DECOSF, SUNOS4, or IRIX4
168 */
169 if ((fhp[4] != 0) && (fhp[5] == 0) &&
170 (fhp[8] == 12) && (fhp[9] == 0)) {
171 /* seems to be DECOSF, with minor == 0 */
172 fhtype = FHT_DECOSF;
173 }
174 else {
175 /* could be SUNOS4 or IRIX4 */
176 /* XXX the test of fhp[5] == 8 could be wrong */
177 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
178 (fhp[7] == 0)) {
179 /* looks like a length, not a file system typecode */
180 fhtype = FHT_IRIX4;
181 }
182 else {
183 /* by elimination */
184 fhtype = FHT_SUNOS4;
185 }
186 }
187 }
188 }
189 else {
190 /*
191 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
192 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
193 * could be AIX, HP-UX
194 */
195 if ((fhp[2] == 0) && (fhp[3] == 0)) {
196 /*
197 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
198 * (unless the exported device name is just one letter!),
199 * could be Ultrix, IRIX5, AIX, or SUNOS5
200 * might be HP-UX (depends on their values for minor devs)
201 */
202 if ((fhp[6] == 0) && (fhp[7] == 0)) {
203 fhtype = FHT_BSD44;
204 }
205 /*XXX we probably only need to test of these two bytes */
206 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
207 fhtype = FHT_ULTRIX;
208 }
209 else {
210 /* Could be SUNOS5/IRIX5, maybe AIX */
211 /* XXX no obvious difference between SUNOS5 and IRIX5 */
212 if (fhp[9] == 10)
213 fhtype = FHT_SUNOS5;
214 /* XXX what about AIX? */
215 }
216 }
217 else {
218 /*
219 * bytes[2,3] != (0,0); rules out Ultrix, could be
220 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
221 */
222 if ((fhp[8] == 12) && (fhp[9] == 0)) {
223 fhtype = FHT_DECOSF;
224 }
225 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
226 /* could be SUNOS5/IRIX5, AIX, HP-UX */
227 if ((fhp[7] == 0) && (fhp[6] == 0) &&
228 (fhp[5] == 0) && (fhp[4] == 0)) {
229 /* XXX is this always true of HP-UX? */
230 fhtype = FHT_HPUX9;
231 }
232 else if (fhp[7] == 2) {
233 /* This would be MNT_NFS on AIX, which is impossible */
234 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
235 }
236 else {
237 /*
238 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
239 * XXX see any way to disambiguate these, so
240 * XXX I'm going with the more likely guess.
241 * XXX Sorry, Big Blue.
242 */
243 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
244 }
245 }
246 else {
247 if (is_UCX(fhp)) {
248 fhtype = FHT_VMSUCX;
249 }
250 else {
251 fhtype = FHT_UNKNOWN;
252 }
253 }
254 }
255 }
256
257 /* XXX still needs to handle SUNOS3 */
258
259 switch (fhtype) {
260 case FHT_AUSPEX:
261 fsidp->Fsid_dev.Minor = fhp[7];
262 fsidp->Fsid_dev.Major = fhp[6];
263 fsidp->fsid_code = 0;
264
265 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
266
267 if (osnamep)
268 *osnamep = "Auspex";
269 break;
270
271 case FHT_BSD44:
272 fsidp->Fsid_dev.Minor = fhp[0];
273 fsidp->Fsid_dev.Major = fhp[1];
274 fsidp->fsid_code = 0;
275
276 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
277
278 if (osnamep)
279 *osnamep = "BSD 4.4";
280 break;
281
282 case FHT_DECOSF:
283 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
284 /* XXX could ignore 3 high-order bytes */
285
286 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
287 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
288 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
289
290 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
291 if (osnamep)
292 *osnamep = "OSF";
293 break;
294
295 case FHT_IRIX4:
296 fsidp->Fsid_dev.Minor = fhp[3];
297 fsidp->Fsid_dev.Major = fhp[2];
298 fsidp->fsid_code = 0;
299
300 *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
301
302 if (osnamep)
303 *osnamep = "IRIX4";
304 break;
305
306 case FHT_IRIX5:
307 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
308 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
309 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
310
311 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
312
313 if (osnamep)
314 *osnamep = "IRIX5";
315 break;
316
317 #ifdef notdef
318 case FHT_SUNOS3:
319 /*
320 * XXX - none of the heuristics above return this.
321 * Are there any SunOS 3.x systems around to care about?
322 */
323 if (osnamep)
324 *osnamep = "SUNOS3";
325 break;
326 #endif
327
328 case FHT_SUNOS4:
329 fsidp->Fsid_dev.Minor = fhp[3];
330 fsidp->Fsid_dev.Major = fhp[2];
331 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
332
333 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
334
335 if (osnamep)
336 *osnamep = "SUNOS4";
337 break;
338
339 case FHT_SUNOS5:
340 temp = make_uint16(fhp[0], fhp[1]);
341 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
342 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
343 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
344 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
345
346 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
347
348 if (osnamep)
349 *osnamep = "SUNOS5";
350 break;
351
352 case FHT_ULTRIX:
353 fsidp->fsid_code = 0;
354 fsidp->Fsid_dev.Minor = fhp[0];
355 fsidp->Fsid_dev.Major = fhp[1];
356
357 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
358 *inop = temp;
359 if (osnamep)
360 *osnamep = "Ultrix";
361 break;
362
363 case FHT_VMSUCX:
364 /* No numeric file system ID, so hash on the device-name */
365 if (sizeof(*fsidp) >= 14) {
366 if (sizeof(*fsidp) > 14)
367 memset((char *)fsidp, 0, sizeof(*fsidp));
368 /* just use the whole thing */
369 memcpy((char *)fsidp, (char *)fh, 14);
370 }
371 else {
372 uint32_t tempa[4]; /* at least 16 bytes, maybe more */
373
374 memset((char *)tempa, 0, sizeof(tempa));
375 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
376 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
377 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
378 fsidp->fsid_code = 0;
379 }
380
381 /* VMS file ID is: (RVN, FidHi, FidLo) */
382 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
383
384 /* Caller must save (and null-terminate?) this value */
385 if (fsnamep)
386 *fsnamep = (char *)&(fhp[1]);
387
388 if (osnamep)
389 *osnamep = "VMS";
390 break;
391
392 case FHT_AIX32:
393 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
394 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
395 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
396
397 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
398
399 if (osnamep)
400 *osnamep = "AIX32";
401 break;
402
403 case FHT_HPUX9:
404 fsidp->Fsid_dev.Major = fhp[0];
405 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
406 fsidp->Fsid_dev.Minor = temp;
407 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
408
409 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
410
411 if (osnamep)
412 *osnamep = "HPUX9";
413 break;
414
415 case FHT_UNKNOWN:
416 #ifdef DEBUG
417 /* XXX debugging */
418 for (i = 0; i < 32; i++)
419 (void)fprintf(stderr, "%x.", fhp[i]);
420 (void)fprintf(stderr, "\n");
421 #endif
422 /* Save the actual handle, so it can be display with -u */
423 for (i = 0; i < 32; i++)
424 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
425
426 /* XXX for now, give "bogus" values to aid debugging */
427 fsidp->fsid_code = 0;
428 fsidp->Fsid_dev.Minor = 257;
429 fsidp->Fsid_dev.Major = 257;
430 *inop = 1;
431
432 /* display will show this string instead of (257,257) */
433 if (fsnamep)
434 *fsnamep = "Unknown";
435
436 if (osnamep)
437 *osnamep = "Unknown";
438 break;
439
440 }
441 }
442
443 /*
444 * Is this a VMS UCX file handle?
445 * Check for:
446 * (1) leading code byte [XXX not yet]
447 * (2) followed by string of printing chars & spaces
448 * (3) followed by string of nulls
449 */
450 static int
is_UCX(const unsigned char * fhp)451 is_UCX(const unsigned char *fhp)
452 {
453 register int i;
454 int seen_null = 0;
455
456 for (i = 1; i < 14; i++) {
457 if (ND_ISPRINT(fhp[i])) {
458 if (seen_null)
459 return(0);
460 else
461 continue;
462 }
463 else if (fhp[i] == 0) {
464 seen_null = 1;
465 continue;
466 }
467 else
468 return(0);
469 }
470
471 return(1);
472 }
473