| 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 | #ifndef lint |
| 44 | static const char rcsid[] _U_ = |
| 45 | "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.28.2.1 2007/06/15 19:15:04 guy Exp $ (LBL)"; |
| 46 | #endif |
| 47 | |
| 48 | #ifdef HAVE_CONFIG_H |
| 49 | #include "config.h" |
| 50 | #endif |
| 51 | |
| 52 | #include <tcpdump-stdinc.h> |
| 53 | |
| 54 | #include <stdio.h> |
| 55 | #include <string.h> |
| 56 | |
| 57 | #include "interface.h" |
| 58 | #include "nfsfh.h" |
| 59 | |
| 60 | /* |
| 61 | * This routine attempts to parse a file handle (in network byte order), |
| 62 | * using heuristics to guess what kind of format it is in. See the |
| 63 | * file "fhandle_layouts" for a detailed description of the various |
| 64 | * patterns we know about. |
| 65 | * |
| 66 | * The file handle is parsed into our internal representation of a |
| 67 | * file-system id, and an internal representation of an inode-number. |
| 68 | */ |
| 69 | |
| 70 | #define FHT_UNKNOWN 0 |
| 71 | #define FHT_AUSPEX 1 |
| 72 | #define FHT_DECOSF 2 |
| 73 | #define FHT_IRIX4 3 |
| 74 | #define FHT_IRIX5 4 |
| 75 | #define FHT_SUNOS3 5 |
| 76 | #define FHT_SUNOS4 6 |
| 77 | #define FHT_ULTRIX 7 |
| 78 | #define FHT_VMSUCX 8 |
| 79 | #define FHT_SUNOS5 9 |
| 80 | #define FHT_AIX32 10 |
| 81 | #define FHT_HPUX9 11 |
| 82 | #define FHT_BSD44 12 |
| 83 | |
| 84 | #ifdef ultrix |
| 85 | /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */ |
| 86 | #define XFF(x) ((u_int32_t)(x)) |
| 87 | #else |
| 88 | #define XFF(x) (x) |
| 89 | #endif |
| 90 | |
| 91 | #define make_uint32(msb,b,c,lsb)\ |
| 92 | (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24)) |
| 93 | |
| 94 | #define make_uint24(msb,b, lsb)\ |
| 95 | (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16)) |
| 96 | |
| 97 | #define make_uint16(msb,lsb)\ |
| 98 | (XFF(lsb) + (XFF(msb)<<8)) |
| 99 | |
| 100 | #ifdef __alpha |
| 101 | /* or other 64-bit systems */ |
| 102 | #define make_uint48(msb,b,c,d,e,lsb)\ |
| 103 | ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40)) |
| 104 | #else |
| 105 | /* on 32-bit systems ignore high-order bits */ |
| 106 | #define make_uint48(msb,b,c,d,e,lsb)\ |
| 107 | ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24)) |
| 108 | #endif |
| 109 | |
| 110 | static int is_UCX(const unsigned char *); |
| 111 | |
| 112 | void |
| 113 | Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself) |
| 114 | register const unsigned char *fh; |
| 115 | int len _U_; |
| 116 | my_fsid *fsidp; |
| 117 | ino_t *inop; |
| 118 | const char **osnamep; /* if non-NULL, return OS name here */ |
| 119 | const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */ |
| 120 | int ourself; /* true if file handle was generated on this host */ |
| 121 | { |
| 122 | register const unsigned char *fhp = fh; |
| 123 | u_int32_t temp; |
| 124 | int fhtype = FHT_UNKNOWN; |
| 125 | int i; |
| 126 | |
| 127 | if (ourself) { |
| 128 | /* File handle generated on this host, no need for guessing */ |
| 129 | #if defined(IRIX40) |
| 130 | fhtype = FHT_IRIX4; |
| 131 | #endif |
| 132 | #if defined(IRIX50) |
| 133 | fhtype = FHT_IRIX5; |
| 134 | #endif |
| 135 | #if defined(IRIX51) |
| 136 | fhtype = FHT_IRIX5; |
| 137 | #endif |
| 138 | #if defined(SUNOS4) |
| 139 | fhtype = FHT_SUNOS4; |
| 140 | #endif |
| 141 | #if defined(SUNOS5) |
| 142 | fhtype = FHT_SUNOS5; |
| 143 | #endif |
| 144 | #if defined(ultrix) |
| 145 | fhtype = FHT_ULTRIX; |
| 146 | #endif |
| 147 | #if defined(__osf__) |
| 148 | fhtype = FHT_DECOSF; |
| 149 | #endif |
| 150 | #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \ |
| 151 | || defined(__OpenBSD__) |
| 152 | fhtype = FHT_BSD44; |
| 153 | #endif |
| 154 | } |
| 155 | /* |
| 156 | * This is basically a big decision tree |
| 157 | */ |
| 158 | else if ((fhp[0] == 0) && (fhp[1] == 0)) { |
| 159 | /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */ |
| 160 | /* probably rules out HP-UX, AIX unless they allow major=0 */ |
| 161 | if ((fhp[2] == 0) && (fhp[3] == 0)) { |
| 162 | /* bytes[2,3] == (0,0); must be Auspex */ |
| 163 | /* XXX or could be Ultrix+MASSBUS "hp" disk? */ |
| 164 | fhtype = FHT_AUSPEX; |
| 165 | } |
| 166 | else { |
| 167 | /* |
| 168 | * bytes[2,3] != (0,0); rules out Auspex, could be |
| 169 | * DECOSF, SUNOS4, or IRIX4 |
| 170 | */ |
| 171 | if ((fhp[4] != 0) && (fhp[5] == 0) && |
| 172 | (fhp[8] == 12) && (fhp[9] == 0)) { |
| 173 | /* seems to be DECOSF, with minor == 0 */ |
| 174 | fhtype = FHT_DECOSF; |
| 175 | } |
| 176 | else { |
| 177 | /* could be SUNOS4 or IRIX4 */ |
| 178 | /* XXX the test of fhp[5] == 8 could be wrong */ |
| 179 | if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) && |
| 180 | (fhp[7] == 0)) { |
| 181 | /* looks like a length, not a file system typecode */ |
| 182 | fhtype = FHT_IRIX4; |
| 183 | } |
| 184 | else { |
| 185 | /* by elimination */ |
| 186 | fhtype = FHT_SUNOS4; |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 | else { |
| 192 | /* |
| 193 | * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4 |
| 194 | * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5 |
| 195 | * could be AIX, HP-UX |
| 196 | */ |
| 197 | if ((fhp[2] == 0) && (fhp[3] == 0)) { |
| 198 | /* |
| 199 | * bytes[2,3] == (0,0); rules out OSF, probably not UCX |
| 200 | * (unless the exported device name is just one letter!), |
| 201 | * could be Ultrix, IRIX5, AIX, or SUNOS5 |
| 202 | * might be HP-UX (depends on their values for minor devs) |
| 203 | */ |
| 204 | if ((fhp[6] == 0) && (fhp[7] == 0)) { |
| 205 | fhtype = FHT_BSD44; |
| 206 | } |
| 207 | /*XXX we probably only need to test of these two bytes */ |
| 208 | else if ((fhp[21] == 0) && (fhp[23] == 0)) { |
| 209 | fhtype = FHT_ULTRIX; |
| 210 | } |
| 211 | else { |
| 212 | /* Could be SUNOS5/IRIX5, maybe AIX */ |
| 213 | /* XXX no obvious difference between SUNOS5 and IRIX5 */ |
| 214 | if (fhp[9] == 10) |
| 215 | fhtype = FHT_SUNOS5; |
| 216 | /* XXX what about AIX? */ |
| 217 | } |
| 218 | } |
| 219 | else { |
| 220 | /* |
| 221 | * bytes[2,3] != (0,0); rules out Ultrix, could be |
| 222 | * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX |
| 223 | */ |
| 224 | if ((fhp[8] == 12) && (fhp[9] == 0)) { |
| 225 | fhtype = FHT_DECOSF; |
| 226 | } |
| 227 | else if ((fhp[8] == 0) && (fhp[9] == 10)) { |
| 228 | /* could be SUNOS5/IRIX5, AIX, HP-UX */ |
| 229 | if ((fhp[7] == 0) && (fhp[6] == 0) && |
| 230 | (fhp[5] == 0) && (fhp[4] == 0)) { |
| 231 | /* XXX is this always true of HP-UX? */ |
| 232 | fhtype = FHT_HPUX9; |
| 233 | } |
| 234 | else if (fhp[7] == 2) { |
| 235 | /* This would be MNT_NFS on AIX, which is impossible */ |
| 236 | fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ |
| 237 | } |
| 238 | else { |
| 239 | /* |
| 240 | * XXX Could be SUNOS5/IRIX5 or AIX. I don't |
| 241 | * XXX see any way to disambiguate these, so |
| 242 | * XXX I'm going with the more likely guess. |
| 243 | * XXX Sorry, Big Blue. |
| 244 | */ |
| 245 | fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ |
| 246 | } |
| 247 | } |
| 248 | else { |
| 249 | if (is_UCX(fhp)) { |
| 250 | fhtype = FHT_VMSUCX; |
| 251 | } |
| 252 | else { |
| 253 | fhtype = FHT_UNKNOWN; |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* XXX still needs to handle SUNOS3 */ |
| 260 | |
| 261 | switch (fhtype) { |
| 262 | case FHT_AUSPEX: |
| 263 | fsidp->Fsid_dev.Minor = fhp[7]; |
| 264 | fsidp->Fsid_dev.Major = fhp[6]; |
| 265 | fsidp->fsid_code = 0; |
| 266 | |
| 267 | temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); |
| 268 | *inop = temp; |
| 269 | |
| 270 | if (osnamep) |
| 271 | *osnamep = "Auspex"; |
| 272 | break; |
| 273 | |
| 274 | case FHT_BSD44: |
| 275 | fsidp->Fsid_dev.Minor = fhp[0]; |
| 276 | fsidp->Fsid_dev.Major = fhp[1]; |
| 277 | fsidp->fsid_code = 0; |
| 278 | |
| 279 | temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); |
| 280 | *inop = temp; |
| 281 | |
| 282 | if (osnamep) |
| 283 | *osnamep = "BSD 4.4"; |
| 284 | break; |
| 285 | |
| 286 | case FHT_DECOSF: |
| 287 | fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); |
| 288 | /* XXX could ignore 3 high-order bytes */ |
| 289 | |
| 290 | temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]); |
| 291 | fsidp->Fsid_dev.Minor = temp & 0xFFFFF; |
| 292 | fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF; |
| 293 | |
| 294 | temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); |
| 295 | *inop = temp; |
| 296 | if (osnamep) |
| 297 | *osnamep = "OSF"; |
| 298 | break; |
| 299 | |
| 300 | case FHT_IRIX4: |
| 301 | fsidp->Fsid_dev.Minor = fhp[3]; |
| 302 | fsidp->Fsid_dev.Major = fhp[2]; |
| 303 | fsidp->fsid_code = 0; |
| 304 | |
| 305 | temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]); |
| 306 | *inop = temp; |
| 307 | |
| 308 | if (osnamep) |
| 309 | *osnamep = "IRIX4"; |
| 310 | break; |
| 311 | |
| 312 | case FHT_IRIX5: |
| 313 | fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); |
| 314 | fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); |
| 315 | fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); |
| 316 | |
| 317 | temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); |
| 318 | *inop = temp; |
| 319 | |
| 320 | if (osnamep) |
| 321 | *osnamep = "IRIX5"; |
| 322 | break; |
| 323 | |
| 324 | #ifdef notdef |
| 325 | case FHT_SUNOS3: |
| 326 | /* |
| 327 | * XXX - none of the heuristics above return this. |
| 328 | * Are there any SunOS 3.x systems around to care about? |
| 329 | */ |
| 330 | if (osnamep) |
| 331 | *osnamep = "SUNOS3"; |
| 332 | break; |
| 333 | #endif |
| 334 | |
| 335 | case FHT_SUNOS4: |
| 336 | fsidp->Fsid_dev.Minor = fhp[3]; |
| 337 | fsidp->Fsid_dev.Major = fhp[2]; |
| 338 | fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); |
| 339 | |
| 340 | temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); |
| 341 | *inop = temp; |
| 342 | |
| 343 | if (osnamep) |
| 344 | *osnamep = "SUNOS4"; |
| 345 | break; |
| 346 | |
| 347 | case FHT_SUNOS5: |
| 348 | temp = make_uint16(fhp[0], fhp[1]); |
| 349 | fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF; |
| 350 | temp = make_uint24(fhp[1], fhp[2], fhp[3]); |
| 351 | fsidp->Fsid_dev.Minor = temp & 0x3FFFF; |
| 352 | fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); |
| 353 | |
| 354 | temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); |
| 355 | *inop = temp; |
| 356 | |
| 357 | if (osnamep) |
| 358 | *osnamep = "SUNOS5"; |
| 359 | break; |
| 360 | |
| 361 | case FHT_ULTRIX: |
| 362 | fsidp->fsid_code = 0; |
| 363 | fsidp->Fsid_dev.Minor = fhp[0]; |
| 364 | fsidp->Fsid_dev.Major = fhp[1]; |
| 365 | |
| 366 | temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); |
| 367 | *inop = temp; |
| 368 | if (osnamep) |
| 369 | *osnamep = "Ultrix"; |
| 370 | break; |
| 371 | |
| 372 | case FHT_VMSUCX: |
| 373 | /* No numeric file system ID, so hash on the device-name */ |
| 374 | if (sizeof(*fsidp) >= 14) { |
| 375 | if (sizeof(*fsidp) > 14) |
| 376 | memset((char *)fsidp, 0, sizeof(*fsidp)); |
| 377 | /* just use the whole thing */ |
| 378 | memcpy((char *)fsidp, (char *)fh, 14); |
| 379 | } |
| 380 | else { |
| 381 | u_int32_t tempa[4]; /* at least 16 bytes, maybe more */ |
| 382 | |
| 383 | memset((char *)tempa, 0, sizeof(tempa)); |
| 384 | memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */ |
| 385 | fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1); |
| 386 | fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1); |
| 387 | fsidp->fsid_code = 0; |
| 388 | } |
| 389 | |
| 390 | /* VMS file ID is: (RVN, FidHi, FidLo) */ |
| 391 | *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]); |
| 392 | |
| 393 | /* Caller must save (and null-terminate?) this value */ |
| 394 | if (fsnamep) |
| 395 | *fsnamep = (char *)&(fhp[1]); |
| 396 | |
| 397 | if (osnamep) |
| 398 | *osnamep = "VMS"; |
| 399 | break; |
| 400 | |
| 401 | case FHT_AIX32: |
| 402 | fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); |
| 403 | fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); |
| 404 | fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); |
| 405 | |
| 406 | temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); |
| 407 | *inop = temp; |
| 408 | |
| 409 | if (osnamep) |
| 410 | *osnamep = "AIX32"; |
| 411 | break; |
| 412 | |
| 413 | case FHT_HPUX9: |
| 414 | fsidp->Fsid_dev.Major = fhp[0]; |
| 415 | temp = make_uint24(fhp[1], fhp[2], fhp[3]); |
| 416 | fsidp->Fsid_dev.Minor = temp; |
| 417 | fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); |
| 418 | |
| 419 | temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); |
| 420 | *inop = temp; |
| 421 | |
| 422 | if (osnamep) |
| 423 | *osnamep = "HPUX9"; |
| 424 | break; |
| 425 | |
| 426 | case FHT_UNKNOWN: |
| 427 | #ifdef DEBUG |
| 428 | /* XXX debugging */ |
| 429 | for (i = 0; i < 32; i++) |
| 430 | (void)fprintf(stderr, "%x.", fhp[i]); |
| 431 | (void)fprintf(stderr, "\n"); |
| 432 | #endif |
| 433 | /* Save the actual handle, so it can be display with -u */ |
| 434 | for (i = 0; i < 32; i++) |
| 435 | (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]); |
| 436 | |
| 437 | /* XXX for now, give "bogus" values to aid debugging */ |
| 438 | fsidp->fsid_code = 0; |
| 439 | fsidp->Fsid_dev.Minor = 257; |
| 440 | fsidp->Fsid_dev.Major = 257; |
| 441 | *inop = 1; |
| 442 | |
| 443 | /* display will show this string instead of (257,257) */ |
| 444 | if (fsnamep) |
| 445 | *fsnamep = "Unknown"; |
| 446 | |
| 447 | if (osnamep) |
| 448 | *osnamep = "Unknown"; |
| 449 | break; |
| 450 | |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Is this a VMS UCX file handle? |
| 456 | * Check for: |
| 457 | * (1) leading code byte [XXX not yet] |
| 458 | * (2) followed by string of printing chars & spaces |
| 459 | * (3) followed by string of nulls |
| 460 | */ |
| 461 | static int |
| 462 | is_UCX(fhp) |
| 463 | const unsigned char *fhp; |
| 464 | { |
| 465 | register int i; |
| 466 | int seen_null = 0; |
| 467 | |
| 468 | for (i = 1; i < 14; i++) { |
| 469 | if (isprint(fhp[i])) { |
| 470 | if (seen_null) |
| 471 | return(0); |
| 472 | else |
| 473 | continue; |
| 474 | } |
| 475 | else if (fhp[i] == 0) { |
| 476 | seen_null = 1; |
| 477 | continue; |
| 478 | } |
| 479 | else |
| 480 | return(0); |
| 481 | } |
| 482 | |
| 483 | return(1); |
| 484 | } |