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 #ifdef HAVE_CONFIG_H 44 #include "config.h" 45 #endif 46 47 #include <netdissect-stdinc.h> 48 49 #include <stdio.h> 50 #include <string.h> 51 52 #include "netdissect.h" 53 #include "nfsfh.h" 54 55 /* 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. 60 * 61 * The file handle is parsed into our internal representation of a 62 * file-system id, and an internal representation of an inode-number. 63 */ 64 65 #define FHT_UNKNOWN 0 66 #define FHT_AUSPEX 1 67 #define FHT_DECOSF 2 68 #define FHT_IRIX4 3 69 #define FHT_IRIX5 4 70 #define FHT_SUNOS3 5 71 #define FHT_SUNOS4 6 72 #define FHT_ULTRIX 7 73 #define FHT_VMSUCX 8 74 #define FHT_SUNOS5 9 75 #define FHT_AIX32 10 76 #define FHT_HPUX9 11 77 #define FHT_BSD44 12 78 79 #ifdef ultrix 80 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */ 81 #define XFF(x) ((uint32_t)(x)) 82 #else 83 #define XFF(x) (x) 84 #endif 85 86 #define make_uint32(msb,b,c,lsb)\ 87 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24)) 88 89 #define make_uint24(msb,b, lsb)\ 90 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16)) 91 92 #define make_uint16(msb,lsb)\ 93 (XFF(lsb) + (XFF(msb)<<8)) 94 95 #ifdef __alpha 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)) 99 #else 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)) 103 #endif 104 105 static int is_UCX(const unsigned char *, u_int); 106 107 void 108 Parse_fh(register const unsigned char *fh, u_int len, my_fsid *fsidp, 109 uint32_t *inop, 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 */ 113 { 114 register const unsigned char *fhp = fh; 115 uint32_t temp; 116 int fhtype = FHT_UNKNOWN; 117 u_int i; 118 119 /* 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. 122 */ 123 if (len < 16/4) 124 fhtype = FHT_UNKNOWN; 125 else { 126 if (ourself) { 127 /* File handle generated on this host, no need for guessing */ 128 #if defined(IRIX40) 129 fhtype = FHT_IRIX4; 130 #endif 131 #if defined(IRIX50) 132 fhtype = FHT_IRIX5; 133 #endif 134 #if defined(IRIX51) 135 fhtype = FHT_IRIX5; 136 #endif 137 #if defined(SUNOS4) 138 fhtype = FHT_SUNOS4; 139 #endif 140 #if defined(SUNOS5) 141 fhtype = FHT_SUNOS5; 142 #endif 143 #if defined(ultrix) 144 fhtype = FHT_ULTRIX; 145 #endif 146 #if defined(__osf__) 147 fhtype = FHT_DECOSF; 148 #endif 149 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \ 150 || defined(__OpenBSD__) 151 fhtype = FHT_BSD44; 152 #endif 153 } 154 /* 155 * This is basically a big decision tree 156 */ 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? */ 163 fhtype = FHT_AUSPEX; 164 } 165 else { 166 /* 167 * bytes[2,3] != (0,0); rules out Auspex, could be 168 * DECOSF, SUNOS4, or IRIX4 169 */ 170 if ((fhp[4] != 0) && (fhp[5] == 0) && 171 (fhp[8] == 12) && (fhp[9] == 0)) { 172 /* seems to be DECOSF, with minor == 0 */ 173 fhtype = FHT_DECOSF; 174 } 175 else { 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) && 179 (fhp[7] == 0)) { 180 /* looks like a length, not a file system typecode */ 181 fhtype = FHT_IRIX4; 182 } 183 else { 184 /* by elimination */ 185 fhtype = FHT_SUNOS4; 186 } 187 } 188 } 189 } 190 else { 191 /* 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 195 */ 196 if ((fhp[2] == 0) && (fhp[3] == 0)) { 197 /* 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) 202 */ 203 if ((fhp[6] == 0) && (fhp[7] == 0)) { 204 fhtype = FHT_BSD44; 205 } 206 /*XXX we probably only need to test of these two bytes */ 207 else if ((len >= 24/4) && (fhp[21] == 0) && (fhp[23] == 0)) { 208 fhtype = FHT_ULTRIX; 209 } 210 else { 211 /* Could be SUNOS5/IRIX5, maybe AIX */ 212 /* XXX no obvious difference between SUNOS5 and IRIX5 */ 213 if (fhp[9] == 10) 214 fhtype = FHT_SUNOS5; 215 /* XXX what about AIX? */ 216 } 217 } 218 else { 219 /* 220 * bytes[2,3] != (0,0); rules out Ultrix, could be 221 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX 222 */ 223 if ((fhp[8] == 12) && (fhp[9] == 0)) { 224 fhtype = FHT_DECOSF; 225 } 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? */ 231 fhtype = FHT_HPUX9; 232 } 233 else if (fhp[7] == 2) { 234 /* This would be MNT_NFS on AIX, which is impossible */ 235 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 236 } 237 else { 238 /* 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. 243 */ 244 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 245 } 246 } 247 else { 248 if (is_UCX(fhp, len)) { 249 fhtype = FHT_VMSUCX; 250 } 251 else { 252 fhtype = FHT_UNKNOWN; 253 } 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 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 268 269 if (osnamep) 270 *osnamep = "Auspex"; 271 break; 272 273 case FHT_BSD44: 274 fsidp->Fsid_dev.Minor = fhp[0]; 275 fsidp->Fsid_dev.Major = fhp[1]; 276 fsidp->fsid_code = 0; 277 278 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); 279 280 if (osnamep) 281 *osnamep = "BSD 4.4"; 282 break; 283 284 case FHT_DECOSF: 285 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); 286 /* XXX could ignore 3 high-order bytes */ 287 288 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; 291 292 *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); 293 if (osnamep) 294 *osnamep = "OSF"; 295 break; 296 297 case FHT_IRIX4: 298 fsidp->Fsid_dev.Minor = fhp[3]; 299 fsidp->Fsid_dev.Major = fhp[2]; 300 fsidp->fsid_code = 0; 301 302 *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]); 303 304 if (osnamep) 305 *osnamep = "IRIX4"; 306 break; 307 308 case FHT_IRIX5: 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]); 312 313 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 314 315 if (osnamep) 316 *osnamep = "IRIX5"; 317 break; 318 319 #ifdef notdef 320 case FHT_SUNOS3: 321 /* 322 * XXX - none of the heuristics above return this. 323 * Are there any SunOS 3.x systems around to care about? 324 */ 325 if (osnamep) 326 *osnamep = "SUNOS3"; 327 break; 328 #endif 329 330 case FHT_SUNOS4: 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]); 334 335 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 336 337 if (osnamep) 338 *osnamep = "SUNOS4"; 339 break; 340 341 case FHT_SUNOS5: 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]); 347 348 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 349 350 if (osnamep) 351 *osnamep = "SUNOS5"; 352 break; 353 354 case FHT_ULTRIX: 355 fsidp->fsid_code = 0; 356 fsidp->Fsid_dev.Minor = fhp[0]; 357 fsidp->Fsid_dev.Major = fhp[1]; 358 359 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); 360 *inop = temp; 361 if (osnamep) 362 *osnamep = "Ultrix"; 363 break; 364 365 case FHT_VMSUCX: 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); 372 } 373 else { 374 uint32_t tempa[4]; /* at least 16 bytes, maybe more */ 375 376 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; 381 } 382 383 /* VMS file ID is: (RVN, FidHi, FidLo) */ 384 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]); 385 386 /* Caller must save (and null-terminate?) this value */ 387 if (fsnamep) 388 *fsnamep = (const char *)&(fhp[1]); 389 390 if (osnamep) 391 *osnamep = "VMS"; 392 break; 393 394 case FHT_AIX32: 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]); 398 399 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 400 401 if (osnamep) 402 *osnamep = "AIX32"; 403 break; 404 405 case FHT_HPUX9: 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]); 410 411 *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 412 413 if (osnamep) 414 *osnamep = "HPUX9"; 415 break; 416 417 case FHT_UNKNOWN: 418 #ifdef DEBUG 419 /* XXX debugging */ 420 for (i = 0; i < len*4; i++) 421 (void)fprintf(stderr, "%x.", fhp[i]); 422 (void)fprintf(stderr, "\n"); 423 #endif 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'; 428 429 /* 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; 433 *inop = 1; 434 435 /* display will show this string instead of (257,257) */ 436 if (fsnamep) 437 *fsnamep = "Unknown"; 438 439 if (osnamep) 440 *osnamep = "Unknown"; 441 break; 442 443 } 444 } 445 446 /* 447 * Is this a VMS UCX file handle? 448 * Check for: 449 * (1) leading code byte [XXX not yet] 450 * (2) followed by string of printing chars & spaces 451 * (3) followed by string of nulls 452 */ 453 static int 454 is_UCX(const unsigned char *fhp, u_int len) 455 { 456 register u_int i; 457 int seen_null = 0; 458 459 /* 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. 462 */ 463 if (len < 28/4) 464 return(0); 465 466 for (i = 1; i < 14; i++) { 467 if (ND_ISPRINT(fhp[i])) { 468 if (seen_null) 469 return(0); 470 else 471 continue; 472 } 473 else if (fhp[i] == 0) { 474 seen_null = 1; 475 continue; 476 } 477 else 478 return(0); 479 } 480 481 return(1); 482 } 483
