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 } 485
