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-ctype.h" 53 54 #include "netdissect.h" 55 #include "extract.h" 56 #include "nfsfh.h" 57 58 /* 59 * This routine attempts to parse a file handle (in network byte order), 60 * using heuristics to guess what kind of format it is in. See the 61 * file "fhandle_layouts" for a detailed description of the various 62 * patterns we know about. 63 * 64 * The file handle is parsed into our internal representation of a 65 * file-system id, and an internal representation of an inode-number. 66 */ 67 68 #define FHT_UNKNOWN 0 69 #define FHT_AUSPEX 1 70 #define FHT_DECOSF 2 71 #define FHT_IRIX4 3 72 #define FHT_IRIX5 4 73 #define FHT_SUNOS3 5 74 #define FHT_SUNOS4 6 75 #define FHT_ULTRIX 7 76 #define FHT_VMSUCX 8 77 #define FHT_SUNOS5 9 78 #define FHT_AIX32 10 79 #define FHT_HPUX9 11 80 #define FHT_BSD44 12 81 82 static int is_UCX(netdissect_options *, const unsigned char *, u_int); 83 84 void 85 Parse_fh(netdissect_options *ndo, const unsigned char *fh, u_int len, 86 my_fsid *fsidp, uint32_t *inop, 87 const char **osnamep, /* if non-NULL, return OS name here */ 88 const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */ 89 int ourself) /* true if file handle was generated on this host */ 90 { 91 const unsigned char *fhp = fh; 92 uint32_t temp; 93 int fhtype = FHT_UNKNOWN; 94 u_int i; 95 96 /* 97 * Require at least 16 bytes of file handle; it's variable-length 98 * in NFSv3. "len" is in units of 32-bit words, not bytes. 99 */ 100 if (len < 16/4) 101 fhtype = FHT_UNKNOWN; 102 else { 103 if (ourself) { 104 /* File handle generated on this host, no need for guessing */ 105 #if defined(IRIX40) 106 fhtype = FHT_IRIX4; 107 #endif 108 #if defined(IRIX50) 109 fhtype = FHT_IRIX5; 110 #endif 111 #if defined(IRIX51) 112 fhtype = FHT_IRIX5; 113 #endif 114 #if defined(SUNOS4) 115 fhtype = FHT_SUNOS4; 116 #endif 117 #if defined(SUNOS5) 118 fhtype = FHT_SUNOS5; 119 #endif 120 #if defined(ultrix) 121 fhtype = FHT_ULTRIX; 122 #endif 123 #if defined(__osf__) 124 fhtype = FHT_DECOSF; 125 #endif 126 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \ 127 || defined(__OpenBSD__) 128 fhtype = FHT_BSD44; 129 #endif 130 } 131 /* 132 * This is basically a big decision tree 133 */ 134 else if ((GET_U_1(fhp) == 0) && (GET_U_1(fhp + 1) == 0)) { 135 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */ 136 /* probably rules out HP-UX, AIX unless they allow major=0 */ 137 if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) { 138 /* bytes[2,3] == (0,0); must be Auspex */ 139 /* XXX or could be Ultrix+MASSBUS "hp" disk? */ 140 fhtype = FHT_AUSPEX; 141 } 142 else { 143 /* 144 * bytes[2,3] != (0,0); rules out Auspex, could be 145 * DECOSF, SUNOS4, or IRIX4 146 */ 147 if ((GET_U_1(fhp + 4) != 0) && (GET_U_1(fhp + 5) == 0) && 148 (GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) { 149 /* seems to be DECOSF, with minor == 0 */ 150 fhtype = FHT_DECOSF; 151 } 152 else { 153 /* could be SUNOS4 or IRIX4 */ 154 /* XXX the test of fhp[5] == 8 could be wrong */ 155 if ((GET_U_1(fhp + 4) == 0) && (GET_U_1(fhp + 5) == 8) && (GET_U_1(fhp + 6) == 0) && 156 (GET_U_1(fhp + 7) == 0)) { 157 /* looks like a length, not a file system typecode */ 158 fhtype = FHT_IRIX4; 159 } 160 else { 161 /* by elimination */ 162 fhtype = FHT_SUNOS4; 163 } 164 } 165 } 166 } 167 else { 168 /* 169 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4 170 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5 171 * could be AIX, HP-UX 172 */ 173 if ((GET_U_1(fhp + 2) == 0) && (GET_U_1(fhp + 3) == 0)) { 174 /* 175 * bytes[2,3] == (0,0); rules out OSF, probably not UCX 176 * (unless the exported device name is just one letter!), 177 * could be Ultrix, IRIX5, AIX, or SUNOS5 178 * might be HP-UX (depends on their values for minor devs) 179 */ 180 if ((GET_U_1(fhp + 6) == 0) && (GET_U_1(fhp + 7) == 0)) { 181 fhtype = FHT_BSD44; 182 } 183 /*XXX we probably only need to test of these two bytes */ 184 else if ((len >= 24/4) && (GET_U_1(fhp + 21) == 0) && (GET_U_1(fhp + 23) == 0)) { 185 fhtype = FHT_ULTRIX; 186 } 187 else { 188 /* Could be SUNOS5/IRIX5, maybe AIX */ 189 /* XXX no obvious difference between SUNOS5 and IRIX5 */ 190 if (GET_U_1(fhp + 9) == 10) 191 fhtype = FHT_SUNOS5; 192 /* XXX what about AIX? */ 193 } 194 } 195 else { 196 /* 197 * bytes[2,3] != (0,0); rules out Ultrix, could be 198 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX 199 */ 200 if ((GET_U_1(fhp + 8) == 12) && (GET_U_1(fhp + 9) == 0)) { 201 fhtype = FHT_DECOSF; 202 } 203 else if ((GET_U_1(fhp + 8) == 0) && (GET_U_1(fhp + 9) == 10)) { 204 /* could be SUNOS5/IRIX5, AIX, HP-UX */ 205 if ((GET_U_1(fhp + 7) == 0) && (GET_U_1(fhp + 6) == 0) && 206 (GET_U_1(fhp + 5) == 0) && (GET_U_1(fhp + 4) == 0)) { 207 /* XXX is this always true of HP-UX? */ 208 fhtype = FHT_HPUX9; 209 } 210 else if (GET_U_1(fhp + 7) == 2) { 211 /* This would be MNT_NFS on AIX, which is impossible */ 212 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 213 } 214 else { 215 /* 216 * XXX Could be SUNOS5/IRIX5 or AIX. I don't 217 * XXX see any way to disambiguate these, so 218 * XXX I'm going with the more likely guess. 219 * XXX Sorry, Big Blue. 220 */ 221 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 222 } 223 } 224 else { 225 if (is_UCX(ndo, fhp, len)) { 226 fhtype = FHT_VMSUCX; 227 } 228 else { 229 fhtype = FHT_UNKNOWN; 230 } 231 } 232 } 233 } 234 } 235 236 /* XXX still needs to handle SUNOS3 */ 237 238 switch (fhtype) { 239 case FHT_AUSPEX: 240 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 7); 241 fsidp->Fsid_dev.Major = GET_U_1(fhp + 6); 242 fsidp->fsid_code = 0; 243 244 *inop = GET_BE_U_4(fhp + 12); 245 246 if (osnamep) 247 *osnamep = "Auspex"; 248 break; 249 250 case FHT_BSD44: 251 fsidp->Fsid_dev.Minor = GET_U_1(fhp); 252 fsidp->Fsid_dev.Major = GET_U_1(fhp + 1); 253 fsidp->fsid_code = 0; 254 255 *inop = GET_LE_U_4(fhp + 12); 256 257 if (osnamep) 258 *osnamep = "BSD 4.4"; 259 break; 260 261 case FHT_DECOSF: 262 fsidp->fsid_code = GET_LE_U_4(fhp + 4); 263 /* XXX could ignore 3 high-order bytes */ 264 265 temp = GET_LE_U_4(fhp); 266 fsidp->Fsid_dev.Minor = temp & 0xFFFFF; 267 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF; 268 269 *inop = GET_LE_U_4(fhp + 12); 270 if (osnamep) 271 *osnamep = "OSF"; 272 break; 273 274 case FHT_IRIX4: 275 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3); 276 fsidp->Fsid_dev.Major = GET_U_1(fhp + 2); 277 fsidp->fsid_code = 0; 278 279 *inop = GET_BE_U_4(fhp + 8); 280 281 if (osnamep) 282 *osnamep = "IRIX4"; 283 break; 284 285 case FHT_IRIX5: 286 fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2); 287 fsidp->Fsid_dev.Major = GET_BE_U_2(fhp); 288 fsidp->fsid_code = GET_BE_U_4(fhp + 4); 289 290 *inop = GET_BE_U_4(fhp + 12); 291 292 if (osnamep) 293 *osnamep = "IRIX5"; 294 break; 295 296 #ifdef notdef 297 case FHT_SUNOS3: 298 /* 299 * XXX - none of the heuristics above return this. 300 * Are there any SunOS 3.x systems around to care about? 301 */ 302 if (osnamep) 303 *osnamep = "SUNOS3"; 304 break; 305 #endif 306 307 case FHT_SUNOS4: 308 fsidp->Fsid_dev.Minor = GET_U_1(fhp + 3); 309 fsidp->Fsid_dev.Major = GET_U_1(fhp + 2); 310 fsidp->fsid_code = GET_BE_U_4(fhp + 4); 311 312 *inop = GET_BE_U_4(fhp + 12); 313 314 if (osnamep) 315 *osnamep = "SUNOS4"; 316 break; 317 318 case FHT_SUNOS5: 319 temp = GET_BE_U_2(fhp); 320 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF; 321 temp = GET_BE_U_3(fhp + 1); 322 fsidp->Fsid_dev.Minor = temp & 0x3FFFF; 323 fsidp->fsid_code = GET_BE_U_4(fhp + 4); 324 325 *inop = GET_BE_U_4(fhp + 12); 326 327 if (osnamep) 328 *osnamep = "SUNOS5"; 329 break; 330 331 case FHT_ULTRIX: 332 fsidp->fsid_code = 0; 333 fsidp->Fsid_dev.Minor = GET_U_1(fhp); 334 fsidp->Fsid_dev.Major = GET_U_1(fhp + 1); 335 336 temp = GET_LE_U_4(fhp + 4); 337 *inop = temp; 338 if (osnamep) 339 *osnamep = "Ultrix"; 340 break; 341 342 case FHT_VMSUCX: 343 /* No numeric file system ID, so hash on the device-name */ 344 if (sizeof(*fsidp) >= 14) { 345 if (sizeof(*fsidp) > 14) 346 memset((char *)fsidp, 0, sizeof(*fsidp)); 347 /* just use the whole thing */ 348 memcpy((char *)fsidp, (const char *)fh, 14); 349 } 350 else { 351 uint32_t tempa[4]; /* at least 16 bytes, maybe more */ 352 353 memset((char *)tempa, 0, sizeof(tempa)); 354 memcpy((char *)tempa, (const char *)fh, 14); /* ensure alignment */ 355 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1); 356 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1); 357 fsidp->fsid_code = 0; 358 } 359 360 /* VMS file ID is: (RVN, FidHi, FidLo) */ 361 *inop = (((uint32_t) GET_U_1(fhp + 26)) << 24) | 362 (((uint32_t) GET_U_1(fhp + 27)) << 16) | 363 (GET_LE_U_2(fhp + 22) << 0); 364 365 /* Caller must save (and null-terminate?) this value */ 366 if (fsnamep) 367 *fsnamep = (const char *)(fhp + 1); 368 369 if (osnamep) 370 *osnamep = "VMS"; 371 break; 372 373 case FHT_AIX32: 374 fsidp->Fsid_dev.Minor = GET_BE_U_2(fhp + 2); 375 fsidp->Fsid_dev.Major = GET_BE_U_2(fhp); 376 fsidp->fsid_code = GET_BE_U_4(fhp + 4); 377 378 *inop = GET_BE_U_4(fhp + 12); 379 380 if (osnamep) 381 *osnamep = "AIX32"; 382 break; 383 384 case FHT_HPUX9: 385 fsidp->Fsid_dev.Major = GET_U_1(fhp); 386 temp = GET_BE_U_3(fhp + 1); 387 fsidp->Fsid_dev.Minor = temp; 388 fsidp->fsid_code = GET_BE_U_4(fhp + 4); 389 390 *inop = GET_BE_U_4(fhp + 12); 391 392 if (osnamep) 393 *osnamep = "HPUX9"; 394 break; 395 396 case FHT_UNKNOWN: 397 #ifdef DEBUG 398 /* XXX debugging */ 399 for (i = 0; i < len*4; i++) 400 (void)fprintf(stderr, "%x.", GET_U_1(fhp + i)); 401 (void)fprintf(stderr, "\n"); 402 #endif 403 /* Save the actual handle, so it can be display with -u */ 404 for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++) 405 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", 406 GET_U_1(fhp + i)); 407 fsidp->Opaque_Handle[i*2] = '\0'; 408 409 /* XXX for now, give "bogus" values to aid debugging */ 410 fsidp->fsid_code = 0; 411 fsidp->Fsid_dev.Minor = 257; 412 fsidp->Fsid_dev.Major = 257; 413 *inop = 1; 414 415 /* display will show this string instead of (257,257) */ 416 if (fsnamep) 417 *fsnamep = "Unknown"; 418 419 if (osnamep) 420 *osnamep = "Unknown"; 421 break; 422 423 } 424 } 425 426 /* 427 * Is this a VMS UCX file handle? 428 * Check for: 429 * (1) leading code byte [XXX not yet] 430 * (2) followed by string of printing chars & spaces 431 * (3) followed by string of nulls 432 */ 433 static int 434 is_UCX(netdissect_options *ndo, const unsigned char *fhp, u_int len) 435 { 436 u_int i; 437 int seen_null = 0; 438 439 /* 440 * Require at least 28 bytes of file handle; it's variable-length 441 * in NFSv3. "len" is in units of 32-bit words, not bytes. 442 */ 443 if (len < 28/4) 444 return(0); 445 446 for (i = 1; i < 14; i++) { 447 if (ND_ASCII_ISPRINT(GET_U_1(fhp + i))) { 448 if (seen_null) 449 return(0); 450 else 451 continue; 452 } 453 else if (GET_U_1(fhp + i) == 0) { 454 seen_null = 1; 455 continue; 456 } 457 else 458 return(0); 459 } 460 461 return(1); 462 } 463