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 44static const char rcsid[] _U_ = 45 "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.29 2006-06-13 22:21:38 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 110static int is_UCX(const unsigned char *); 111 112void 113Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself) 114register const unsigned char *fh; 115int len _U_; 116my_fsid *fsidp; 117u_int32_t *inop; 118const char **osnamep; /* if non-NULL, return OS name here */ 119const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */ 120int 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 *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, (char *)fh, 14); 372 } 373 else { 374 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */ 375 376 memset((char *)tempa, 0, sizeof(tempa)); 377 memcpy((char *)tempa, (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 = (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 < 32; 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 < 32; i++) 426 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]); 427 428 /* XXX for now, give "bogus" values to aid debugging */ 429 fsidp->fsid_code = 0; 430 fsidp->Fsid_dev.Minor = 257; 431 fsidp->Fsid_dev.Major = 257; 432 *inop = 1; 433 434 /* display will show this string instead of (257,257) */ 435 if (fsnamep) 436 *fsnamep = "Unknown"; 437 438 if (osnamep) 439 *osnamep = "Unknown"; 440 break; 441 442 } 443} 444 445/* 446 * Is this a VMS UCX file handle? 447 * Check for: 448 * (1) leading code byte [XXX not yet] 449 * (2) followed by string of printing chars & spaces 450 * (3) followed by string of nulls 451 */ 452static int 453is_UCX(fhp) 454const unsigned char *fhp; 455{ 456 register int i; 457 int seen_null = 0; 458 459 for (i = 1; i < 14; i++) { 460 if (ND_ISPRINT(fhp[i])) { 461 if (seen_null) 462 return(0); 463 else 464 continue; 465 } 466 else if (fhp[i] == 0) { 467 seen_null = 1; 468 continue; 469 } 470 else 471 return(0); 472 } 473 474 return(1); 475} 476