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.
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35 * parsenfsfh.c - portable parser for NFS file handles
36 * uses all sorts of heuristics
39 * Digital Equipment Corporation
40 * Western Research Laboratory
47 #include <netdissect-stdinc.h>
52 #include "netdissect.h"
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.
61 * The file handle is parsed into our internal representation of a
62 * file-system id, and an internal representation of an inode-number.
80 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
81 #define XFF(x) ((uint32_t)(x))
86 #define make_uint32(msb,b,c,lsb)\
87 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
89 #define make_uint24(msb,b, lsb)\
90 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
92 #define make_uint16(msb,lsb)\
93 (XFF(lsb) + (XFF(msb)<<8))
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))
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))
105 static int is_UCX(const unsigned char *, u_int);
108 Parse_fh(register const unsigned char *fh, u_int len, my_fsid *fsidp,
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 */
114 register const unsigned char *fhp = fh;
116 int fhtype = FHT_UNKNOWN;
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.
124 fhtype = FHT_UNKNOWN;
127 /* File handle generated on this host, no need for guessing */
149 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
150 || defined(__OpenBSD__)
155 * This is basically a big decision tree
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? */
167 * bytes[2,3] != (0,0); rules out Auspex, could be
168 * DECOSF, SUNOS4, or IRIX4
170 if ((fhp[4] != 0) && (fhp[5] == 0) &&
171 (fhp[8] == 12) && (fhp[9] == 0)) {
172 /* seems to be DECOSF, with minor == 0 */
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) &&
180 /* looks like a length, not a file system typecode */
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
196 if ((fhp[2] == 0) && (fhp[3] == 0)) {
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)
203 if ((fhp[6] == 0) && (fhp[7] == 0)) {
206 /*XXX we probably only need to test of these two bytes */
207 else if ((len >= 24/4) && (fhp[21] == 0) && (fhp[23] == 0)) {
211 /* Could be SUNOS5/IRIX5, maybe AIX */
212 /* XXX no obvious difference between SUNOS5 and IRIX5 */
215 /* XXX what about AIX? */
220 * bytes[2,3] != (0,0); rules out Ultrix, could be
221 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
223 if ((fhp[8] == 12) && (fhp[9] == 0)) {
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? */
233 else if (fhp[7] == 2) {
234 /* This would be MNT_NFS on AIX, which is impossible */
235 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
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.
244 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
248 if (is_UCX(fhp, len)) {
252 fhtype = FHT_UNKNOWN;
259 /* XXX still needs to handle SUNOS3 */
263 fsidp->Fsid_dev.Minor = fhp[7];
264 fsidp->Fsid_dev.Major = fhp[6];
265 fsidp->fsid_code = 0;
267 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
274 fsidp->Fsid_dev.Minor = fhp[0];
275 fsidp->Fsid_dev.Major = fhp[1];
276 fsidp->fsid_code = 0;
278 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
281 *osnamep = "BSD 4.4";
285 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
286 /* XXX could ignore 3 high-order bytes */
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;
292 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
298 fsidp->Fsid_dev.Minor = fhp[3];
299 fsidp->Fsid_dev.Major = fhp[2];
300 fsidp->fsid_code = 0;
302 *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
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]);
313 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
322 * XXX - none of the heuristics above return this.
323 * Are there any SunOS 3.x systems around to care about?
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]);
335 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
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]);
348 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
355 fsidp->fsid_code = 0;
356 fsidp->Fsid_dev.Minor = fhp[0];
357 fsidp->Fsid_dev.Major = fhp[1];
359 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
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);
374 uint32_t tempa[4]; /* at least 16 bytes, maybe more */
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;
383 /* VMS file ID is: (RVN, FidHi, FidLo) */
384 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
386 /* Caller must save (and null-terminate?) this value */
388 *fsnamep = (const char *)&(fhp[1]);
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]);
399 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
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]);
411 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
420 for (i = 0; i < len*4; i++)
421 (void)fprintf(stderr, "%x.", fhp[i]);
422 (void)fprintf(stderr, "\n");
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';
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;
435 /* display will show this string instead of (257,257) */
437 *fsnamep = "Unknown";
440 *osnamep = "Unknown";
447 * Is this a VMS UCX file handle?
449 * (1) leading code byte [XXX not yet]
450 * (2) followed by string of printing chars & spaces
451 * (3) followed by string of nulls
454 is_UCX(const unsigned char *fhp, u_int len)
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.
466 for (i = 1; i < 14; i++) {
467 if (ND_ISPRINT(fhp[i])) {
473 else if (fhp[i] == 0) {