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 * $FreeBSD$ 43 */ 44 45 #ifndef lint 46 static const char rcsid[] _U_ = 47 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.29 2006-06-13 22:21:38 guy Exp $ (LBL)"; 48 #endif 49 50 #ifdef HAVE_CONFIG_H 51 #include "config.h" 52 #endif 53 54 #include <tcpdump-stdinc.h> 55 56 #include <stdio.h> 57 #include <string.h> 58 59 #include "interface.h" 60 #include "nfsfh.h" 61 62 /* 63 * This routine attempts to parse a file handle (in network byte order), 64 * using heuristics to guess what kind of format it is in. See the 65 * file "fhandle_layouts" for a detailed description of the various 66 * patterns we know about. 67 * 68 * The file handle is parsed into our internal representation of a 69 * file-system id, and an internal representation of an inode-number. 70 */ 71 72 #define FHT_UNKNOWN 0 73 #define FHT_AUSPEX 1 74 #define FHT_DECOSF 2 75 #define FHT_IRIX4 3 76 #define FHT_IRIX5 4 77 #define FHT_SUNOS3 5 78 #define FHT_SUNOS4 6 79 #define FHT_ULTRIX 7 80 #define FHT_VMSUCX 8 81 #define FHT_SUNOS5 9 82 #define FHT_AIX32 10 83 #define FHT_HPUX9 11 84 #define FHT_BSD44 12 85 86 #ifdef ultrix 87 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */ 88 #define XFF(x) ((u_int32_t)(x)) 89 #else 90 #define XFF(x) (x) 91 #endif 92 93 #define make_uint32(msb,b,c,lsb)\ 94 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24)) 95 96 #define make_uint24(msb,b, lsb)\ 97 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16)) 98 99 #define make_uint16(msb,lsb)\ 100 (XFF(lsb) + (XFF(msb)<<8)) 101 102 #ifdef __alpha 103 /* or other 64-bit systems */ 104 #define make_uint48(msb,b,c,d,e,lsb)\ 105 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40)) 106 #else 107 /* on 32-bit systems ignore high-order bits */ 108 #define make_uint48(msb,b,c,d,e,lsb)\ 109 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24)) 110 #endif 111 112 static int is_UCX(const unsigned char *); 113 114 void 115 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself) 116 register const unsigned char *fh; 117 int len _U_; 118 my_fsid *fsidp; 119 ino_t *inop; 120 const char **osnamep; /* if non-NULL, return OS name here */ 121 const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */ 122 int ourself; /* true if file handle was generated on this host */ 123 { 124 register const unsigned char *fhp = fh; 125 u_int32_t temp; 126 int fhtype = FHT_UNKNOWN; 127 int i; 128 129 if (ourself) { 130 /* File handle generated on this host, no need for guessing */ 131 #if defined(IRIX40) 132 fhtype = FHT_IRIX4; 133 #endif 134 #if defined(IRIX50) 135 fhtype = FHT_IRIX5; 136 #endif 137 #if defined(IRIX51) 138 fhtype = FHT_IRIX5; 139 #endif 140 #if defined(SUNOS4) 141 fhtype = FHT_SUNOS4; 142 #endif 143 #if defined(SUNOS5) 144 fhtype = FHT_SUNOS5; 145 #endif 146 #if defined(ultrix) 147 fhtype = FHT_ULTRIX; 148 #endif 149 #if defined(__osf__) 150 fhtype = FHT_DECOSF; 151 #endif 152 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \ 153 || defined(__OpenBSD__) 154 fhtype = FHT_BSD44; 155 #endif 156 } 157 /* 158 * This is basically a big decision tree 159 */ 160 else if ((fhp[0] == 0) && (fhp[1] == 0)) { 161 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */ 162 /* probably rules out HP-UX, AIX unless they allow major=0 */ 163 if ((fhp[2] == 0) && (fhp[3] == 0)) { 164 /* bytes[2,3] == (0,0); must be Auspex */ 165 /* XXX or could be Ultrix+MASSBUS "hp" disk? */ 166 fhtype = FHT_AUSPEX; 167 } 168 else { 169 /* 170 * bytes[2,3] != (0,0); rules out Auspex, could be 171 * DECOSF, SUNOS4, or IRIX4 172 */ 173 if ((fhp[4] != 0) && (fhp[5] == 0) && 174 (fhp[8] == 12) && (fhp[9] == 0)) { 175 /* seems to be DECOSF, with minor == 0 */ 176 fhtype = FHT_DECOSF; 177 } 178 else { 179 /* could be SUNOS4 or IRIX4 */ 180 /* XXX the test of fhp[5] == 8 could be wrong */ 181 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) && 182 (fhp[7] == 0)) { 183 /* looks like a length, not a file system typecode */ 184 fhtype = FHT_IRIX4; 185 } 186 else { 187 /* by elimination */ 188 fhtype = FHT_SUNOS4; 189 } 190 } 191 } 192 } 193 else { 194 /* 195 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4 196 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5 197 * could be AIX, HP-UX 198 */ 199 if ((fhp[2] == 0) && (fhp[3] == 0)) { 200 /* 201 * bytes[2,3] == (0,0); rules out OSF, probably not UCX 202 * (unless the exported device name is just one letter!), 203 * could be Ultrix, IRIX5, AIX, or SUNOS5 204 * might be HP-UX (depends on their values for minor devs) 205 */ 206 if ((fhp[6] == 0) && (fhp[7] == 0)) { 207 fhtype = FHT_BSD44; 208 } 209 /*XXX we probably only need to test of these two bytes */ 210 else if ((fhp[21] == 0) && (fhp[23] == 0)) { 211 fhtype = FHT_ULTRIX; 212 } 213 else { 214 /* Could be SUNOS5/IRIX5, maybe AIX */ 215 /* XXX no obvious difference between SUNOS5 and IRIX5 */ 216 if (fhp[9] == 10) 217 fhtype = FHT_SUNOS5; 218 /* XXX what about AIX? */ 219 } 220 } 221 else { 222 /* 223 * bytes[2,3] != (0,0); rules out Ultrix, could be 224 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX 225 */ 226 if ((fhp[8] == 12) && (fhp[9] == 0)) { 227 fhtype = FHT_DECOSF; 228 } 229 else if ((fhp[8] == 0) && (fhp[9] == 10)) { 230 /* could be SUNOS5/IRIX5, AIX, HP-UX */ 231 if ((fhp[7] == 0) && (fhp[6] == 0) && 232 (fhp[5] == 0) && (fhp[4] == 0)) { 233 /* XXX is this always true of HP-UX? */ 234 fhtype = FHT_HPUX9; 235 } 236 else if (fhp[7] == 2) { 237 /* This would be MNT_NFS on AIX, which is impossible */ 238 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 239 } 240 else { 241 /* 242 * XXX Could be SUNOS5/IRIX5 or AIX. I don't 243 * XXX see any way to disambiguate these, so 244 * XXX I'm going with the more likely guess. 245 * XXX Sorry, Big Blue. 246 */ 247 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 248 } 249 } 250 else { 251 if (is_UCX(fhp)) { 252 fhtype = FHT_VMSUCX; 253 } 254 else { 255 fhtype = FHT_UNKNOWN; 256 } 257 } 258 } 259 } 260 261 /* XXX still needs to handle SUNOS3 */ 262 263 switch (fhtype) { 264 case FHT_AUSPEX: 265 fsidp->Fsid_dev.Minor = fhp[7]; 266 fsidp->Fsid_dev.Major = fhp[6]; 267 fsidp->fsid_code = 0; 268 269 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 270 *inop = temp; 271 272 if (osnamep) 273 *osnamep = "Auspex"; 274 break; 275 276 case FHT_BSD44: 277 fsidp->Fsid_dev.Minor = fhp[0]; 278 fsidp->Fsid_dev.Major = fhp[1]; 279 fsidp->fsid_code = 0; 280 281 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); 282 *inop = temp; 283 284 if (osnamep) 285 *osnamep = "BSD 4.4"; 286 break; 287 288 case FHT_DECOSF: 289 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); 290 /* XXX could ignore 3 high-order bytes */ 291 292 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]); 293 fsidp->Fsid_dev.Minor = temp & 0xFFFFF; 294 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF; 295 296 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); 297 *inop = temp; 298 if (osnamep) 299 *osnamep = "OSF"; 300 break; 301 302 case FHT_IRIX4: 303 fsidp->Fsid_dev.Minor = fhp[3]; 304 fsidp->Fsid_dev.Major = fhp[2]; 305 fsidp->fsid_code = 0; 306 307 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]); 308 *inop = temp; 309 310 if (osnamep) 311 *osnamep = "IRIX4"; 312 break; 313 314 case FHT_IRIX5: 315 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); 316 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); 317 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 318 319 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 320 *inop = temp; 321 322 if (osnamep) 323 *osnamep = "IRIX5"; 324 break; 325 326 #ifdef notdef 327 case FHT_SUNOS3: 328 /* 329 * XXX - none of the heuristics above return this. 330 * Are there any SunOS 3.x systems around to care about? 331 */ 332 if (osnamep) 333 *osnamep = "SUNOS3"; 334 break; 335 #endif 336 337 case FHT_SUNOS4: 338 fsidp->Fsid_dev.Minor = fhp[3]; 339 fsidp->Fsid_dev.Major = fhp[2]; 340 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 341 342 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 343 *inop = temp; 344 345 if (osnamep) 346 *osnamep = "SUNOS4"; 347 break; 348 349 case FHT_SUNOS5: 350 temp = make_uint16(fhp[0], fhp[1]); 351 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF; 352 temp = make_uint24(fhp[1], fhp[2], fhp[3]); 353 fsidp->Fsid_dev.Minor = temp & 0x3FFFF; 354 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 355 356 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 357 *inop = temp; 358 359 if (osnamep) 360 *osnamep = "SUNOS5"; 361 break; 362 363 case FHT_ULTRIX: 364 fsidp->fsid_code = 0; 365 fsidp->Fsid_dev.Minor = fhp[0]; 366 fsidp->Fsid_dev.Major = fhp[1]; 367 368 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); 369 *inop = temp; 370 if (osnamep) 371 *osnamep = "Ultrix"; 372 break; 373 374 case FHT_VMSUCX: 375 /* No numeric file system ID, so hash on the device-name */ 376 if (sizeof(*fsidp) >= 14) { 377 if (sizeof(*fsidp) > 14) 378 memset((char *)fsidp, 0, sizeof(*fsidp)); 379 /* just use the whole thing */ 380 memcpy((char *)fsidp, (char *)fh, 14); 381 } 382 else { 383 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */ 384 385 memset((char *)tempa, 0, sizeof(tempa)); 386 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */ 387 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1); 388 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1); 389 fsidp->fsid_code = 0; 390 } 391 392 /* VMS file ID is: (RVN, FidHi, FidLo) */ 393 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]); 394 395 /* Caller must save (and null-terminate?) this value */ 396 if (fsnamep) 397 *fsnamep = (char *)&(fhp[1]); 398 399 if (osnamep) 400 *osnamep = "VMS"; 401 break; 402 403 case FHT_AIX32: 404 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); 405 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); 406 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 407 408 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 409 *inop = temp; 410 411 if (osnamep) 412 *osnamep = "AIX32"; 413 break; 414 415 case FHT_HPUX9: 416 fsidp->Fsid_dev.Major = fhp[0]; 417 temp = make_uint24(fhp[1], fhp[2], fhp[3]); 418 fsidp->Fsid_dev.Minor = temp; 419 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 420 421 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 422 *inop = temp; 423 424 if (osnamep) 425 *osnamep = "HPUX9"; 426 break; 427 428 case FHT_UNKNOWN: 429 #ifdef DEBUG 430 /* XXX debugging */ 431 for (i = 0; i < 32; i++) 432 (void)fprintf(stderr, "%x.", fhp[i]); 433 (void)fprintf(stderr, "\n"); 434 #endif 435 /* Save the actual handle, so it can be display with -u */ 436 for (i = 0; i < 32; i++) 437 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]); 438 439 /* XXX for now, give "bogus" values to aid debugging */ 440 fsidp->fsid_code = 0; 441 fsidp->Fsid_dev.Minor = 257; 442 fsidp->Fsid_dev.Major = 257; 443 *inop = 1; 444 445 /* display will show this string instead of (257,257) */ 446 if (fsnamep) 447 *fsnamep = "Unknown"; 448 449 if (osnamep) 450 *osnamep = "Unknown"; 451 break; 452 453 } 454 } 455 456 /* 457 * Is this a VMS UCX file handle? 458 * Check for: 459 * (1) leading code byte [XXX not yet] 460 * (2) followed by string of printing chars & spaces 461 * (3) followed by string of nulls 462 */ 463 static int 464 is_UCX(fhp) 465 const unsigned char *fhp; 466 { 467 register int i; 468 int seen_null = 0; 469 470 for (i = 1; i < 14; i++) { 471 if (isprint(fhp[i])) { 472 if (seen_null) 473 return(0); 474 else 475 continue; 476 } 477 else if (fhp[i] == 0) { 478 seen_null = 1; 479 continue; 480 } 481 else 482 return(0); 483 } 484 485 return(1); 486 } 487