2 * parsenfsfh.c - portable parser for NFS file handles
3 * uses all sorts of heuristics
6 * Digital Equipment Corporation
7 * Western Research Laboratory
13 static const char rcsid[] =
14 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.18 2000/07/01 03:39:00 assar Exp $ (LBL)";
21 #include <sys/types.h>
28 #include "interface.h"
32 * This routine attempts to parse a file handle (in network byte order),
33 * using heuristics to guess what kind of format it is in. See the
34 * file "fhandle_layouts" for a detailed description of the various
35 * patterns we know about.
37 * The file handle is parsed into our internal representation of a
38 * file-system id, and an internal representation of an inode-number.
55 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
56 #define XFF(x) ((u_int32_t)(x))
61 #define make_uint32(msb,b,c,lsb)\
62 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
64 #define make_uint24(msb,b, lsb)\
65 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
67 #define make_uint16(msb,lsb)\
68 (XFF(lsb) + (XFF(msb)<<8))
71 /* or other 64-bit systems */
72 #define make_uint48(msb,b,c,d,e,lsb)\
73 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
75 /* on 32-bit systems ignore high-order bits */
76 #define make_uint48(msb,b,c,d,e,lsb)\
77 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
80 static int is_UCX(unsigned char *);
83 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
88 char **osnamep; /* if non-NULL, return OS name here */
89 char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */
90 int ourself; /* true if file handle was generated on this host */
92 register unsigned char *fhp = (unsigned char *)fh;
94 int fhtype = FHT_UNKNOWN;
98 /* File handle generated on this host, no need for guessing */
122 * This is basically a big decision tree
124 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
125 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
126 /* probably rules out HP-UX, AIX unless they allow major=0 */
127 if ((fhp[2] == 0) && (fhp[3] == 0)) {
128 /* bytes[2,3] == (0,0); must be Auspex */
129 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
134 * bytes[2,3] != (0,0); rules out Auspex, could be
135 * DECOSF, SUNOS4, or IRIX4
137 if ((fhp[4] != 0) && (fhp[5] == 0) &&
138 (fhp[8] == 12) && (fhp[9] == 0)) {
139 /* seems to be DECOSF, with minor == 0 */
143 /* could be SUNOS4 or IRIX4 */
144 /* XXX the test of fhp[5] == 8 could be wrong */
145 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
147 /* looks like a length, not a file system typecode */
159 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
160 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
161 * could be AIX, HP-UX
163 if ((fhp[2] == 0) && (fhp[3] == 0)) {
165 * bytes[2,3] == (0,0); rules out OSF, probably not UCX
166 * (unless the exported device name is just one letter!),
167 * could be Ultrix, IRIX5, AIX, or SUNOS5
168 * might be HP-UX (depends on their values for minor devs)
170 /*XXX we probably only need to test of these two bytes */
171 if ((fhp[21] == 0) && (fhp[23] == 0)) {
175 /* Could be SUNOS5/IRIX5, maybe AIX */
176 /* XXX no obvious difference between SUNOS5 and IRIX5 */
179 /* XXX what about AIX? */
184 * bytes[2,3] != (0,0); rules out Ultrix, could be
185 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
187 if ((fhp[8] == 12) && (fhp[9] == 0)) {
190 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
191 /* could be SUNOS5/IRIX5, AIX, HP-UX */
192 if ((fhp[7] == 0) && (fhp[6] == 0) &&
193 (fhp[5] == 0) && (fhp[4] == 0)) {
194 /* XXX is this always true of HP-UX? */
197 else if (fhp[7] == 2) {
198 /* This would be MNT_NFS on AIX, which is impossible */
199 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
203 * XXX Could be SUNOS5/IRIX5 or AIX. I don't
204 * XXX see any way to disambiguate these, so
205 * XXX I'm going with the more likely guess.
206 * XXX Sorry, Big Blue.
208 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */
216 fhtype = FHT_UNKNOWN;
222 /* XXX still needs to handle SUNOS3 */
226 fsidp->Fsid_dev.Minor = fhp[7];
227 fsidp->Fsid_dev.Major = fhp[6];
228 fsidp->fsid_code = 0;
230 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
238 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
239 /* XXX could ignore 3 high-order bytes */
241 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
242 fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
243 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
245 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
252 fsidp->Fsid_dev.Minor = fhp[3];
253 fsidp->Fsid_dev.Major = fhp[2];
254 fsidp->fsid_code = 0;
256 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
264 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
265 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
266 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
268 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
281 fsidp->Fsid_dev.Minor = fhp[3];
282 fsidp->Fsid_dev.Major = fhp[2];
283 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
285 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
293 temp = make_uint16(fhp[0], fhp[1]);
294 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF;
295 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
296 fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
297 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
299 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
307 fsidp->fsid_code = 0;
308 fsidp->Fsid_dev.Minor = fhp[0];
309 fsidp->Fsid_dev.Major = fhp[1];
311 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
318 /* No numeric file system ID, so hash on the device-name */
319 if (sizeof(*fsidp) >= 14) {
320 if (sizeof(*fsidp) > 14)
321 memset((char *)fsidp, 0, sizeof(*fsidp));
322 /* just use the whole thing */
323 memcpy((char *)fsidp, (char *)fh, 14);
326 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */
328 memset((char *)tempa, 0, sizeof(tempa));
329 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
330 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
331 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
332 fsidp->fsid_code = 0;
335 /* VMS file ID is: (RVN, FidHi, FidLo) */
336 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
338 /* Caller must save (and null-terminate?) this value */
340 *fsnamep = (char *)&(fhp[1]);
347 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
348 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
349 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
351 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
359 fsidp->Fsid_dev.Major = fhp[0];
360 temp = make_uint24(fhp[1], fhp[2], fhp[3]);
361 fsidp->Fsid_dev.Minor = temp;
362 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
364 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
375 for (i = 0; i < 32; i++)
376 (void)fprintf(stderr, "%x.", fhp[i]);
377 (void)fprintf(stderr, "\n");
379 /* XXX for now, give "bogus" values to aid debugging */
381 /* Save the actual handle, so it can be display with -u */
382 for (i = 0; i < 32; i++)
383 (void)sprintf(&(fsidp->Opaque_Handle[i*2]), "%.2X", fhp[i]);
385 fsidp->fsid_code = 0;
386 fsidp->Fsid_dev.Minor = 257;
387 fsidp->Fsid_dev.Major = 257;
390 /* display will show this string instead of (257,257) */
392 *fsnamep = "Unknown";
395 *osnamep = "Unknown";
402 * Is this a VMS UCX file handle?
404 * (1) leading code byte [XXX not yet]
405 * (2) followed by string of printing chars & spaces
406 * (3) followed by string of nulls
415 for (i = 1; i < 14; i++) {
416 if (isprint(fhp[i])) {
422 else if (fhp[i] == 0) {