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 1.25.2.2 2003/11/16 08:51:07 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 85 #ifdef ultrix 86 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */ 87 #define XFF(x) ((u_int32_t)(x)) 88 #else 89 #define XFF(x) (x) 90 #endif 91 92 #define make_uint32(msb,b,c,lsb)\ 93 (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24)) 94 95 #define make_uint24(msb,b, lsb)\ 96 (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16)) 97 98 #define make_uint16(msb,lsb)\ 99 (XFF(lsb) + (XFF(msb)<<8)) 100 101 #ifdef __alpha 102 /* or other 64-bit systems */ 103 #define make_uint48(msb,b,c,d,e,lsb)\ 104 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40)) 105 #else 106 /* on 32-bit systems ignore high-order bits */ 107 #define make_uint48(msb,b,c,d,e,lsb)\ 108 ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24)) 109 #endif 110 111 static int is_UCX(const unsigned char *); 112 113 void 114 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself) 115 register const unsigned char *fh; 116 int len; 117 my_fsid *fsidp; 118 ino_t *inop; 119 const char **osnamep; /* if non-NULL, return OS name here */ 120 const char **fsnamep; /* if non-NULL, return server fs name here (for VMS) */ 121 int ourself; /* true if file handle was generated on this host */ 122 { 123 register const unsigned char *fhp = fh; 124 u_int32_t temp; 125 int fhtype = FHT_UNKNOWN; 126 int i; 127 128 if (ourself) { 129 /* File handle generated on this host, no need for guessing */ 130 #if defined(IRIX40) 131 fhtype = FHT_IRIX4; 132 #endif 133 #if defined(IRIX50) 134 fhtype = FHT_IRIX5; 135 #endif 136 #if defined(IRIX51) 137 fhtype = FHT_IRIX5; 138 #endif 139 #if defined(SUNOS4) 140 fhtype = FHT_SUNOS4; 141 #endif 142 #if defined(SUNOS5) 143 fhtype = FHT_SUNOS5; 144 #endif 145 #if defined(ultrix) 146 fhtype = FHT_ULTRIX; 147 #endif 148 #if defined(__osf__) 149 fhtype = FHT_DECOSF; 150 #endif 151 } 152 /* 153 * This is basically a big decision tree 154 */ 155 else if ((fhp[0] == 0) && (fhp[1] == 0)) { 156 /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */ 157 /* probably rules out HP-UX, AIX unless they allow major=0 */ 158 if ((fhp[2] == 0) && (fhp[3] == 0)) { 159 /* bytes[2,3] == (0,0); must be Auspex */ 160 /* XXX or could be Ultrix+MASSBUS "hp" disk? */ 161 fhtype = FHT_AUSPEX; 162 } 163 else { 164 /* 165 * bytes[2,3] != (0,0); rules out Auspex, could be 166 * DECOSF, SUNOS4, or IRIX4 167 */ 168 if ((fhp[4] != 0) && (fhp[5] == 0) && 169 (fhp[8] == 12) && (fhp[9] == 0)) { 170 /* seems to be DECOSF, with minor == 0 */ 171 fhtype = FHT_DECOSF; 172 } 173 else { 174 /* could be SUNOS4 or IRIX4 */ 175 /* XXX the test of fhp[5] == 8 could be wrong */ 176 if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) && 177 (fhp[7] == 0)) { 178 /* looks like a length, not a file system typecode */ 179 fhtype = FHT_IRIX4; 180 } 181 else { 182 /* by elimination */ 183 fhtype = FHT_SUNOS4; 184 } 185 } 186 } 187 } 188 else { 189 /* 190 * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4 191 * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5 192 * could be AIX, HP-UX 193 */ 194 if ((fhp[2] == 0) && (fhp[3] == 0)) { 195 /* 196 * bytes[2,3] == (0,0); rules out OSF, probably not UCX 197 * (unless the exported device name is just one letter!), 198 * could be Ultrix, IRIX5, AIX, or SUNOS5 199 * might be HP-UX (depends on their values for minor devs) 200 */ 201 /*XXX we probably only need to test of these two bytes */ 202 if ((fhp[21] == 0) && (fhp[23] == 0)) { 203 fhtype = FHT_ULTRIX; 204 } 205 else { 206 /* Could be SUNOS5/IRIX5, maybe AIX */ 207 /* XXX no obvious difference between SUNOS5 and IRIX5 */ 208 if (fhp[9] == 10) 209 fhtype = FHT_SUNOS5; 210 /* XXX what about AIX? */ 211 } 212 } 213 else { 214 /* 215 * bytes[2,3] != (0,0); rules out Ultrix, could be 216 * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX 217 */ 218 if ((fhp[8] == 12) && (fhp[9] == 0)) { 219 fhtype = FHT_DECOSF; 220 } 221 else if ((fhp[8] == 0) && (fhp[9] == 10)) { 222 /* could be SUNOS5/IRIX5, AIX, HP-UX */ 223 if ((fhp[7] == 0) && (fhp[6] == 0) && 224 (fhp[5] == 0) && (fhp[4] == 0)) { 225 /* XXX is this always true of HP-UX? */ 226 fhtype = FHT_HPUX9; 227 } 228 else if (fhp[7] == 2) { 229 /* This would be MNT_NFS on AIX, which is impossible */ 230 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 231 } 232 else { 233 /* 234 * XXX Could be SUNOS5/IRIX5 or AIX. I don't 235 * XXX see any way to disambiguate these, so 236 * XXX I'm going with the more likely guess. 237 * XXX Sorry, Big Blue. 238 */ 239 fhtype = FHT_SUNOS5; /* or maybe IRIX5 */ 240 } 241 } 242 else { 243 if (is_UCX(fhp)) { 244 fhtype = FHT_VMSUCX; 245 } 246 else { 247 fhtype = FHT_UNKNOWN; 248 } 249 } 250 } 251 } 252 253 /* XXX still needs to handle SUNOS3 */ 254 255 switch (fhtype) { 256 case FHT_AUSPEX: 257 fsidp->Fsid_dev.Minor = fhp[7]; 258 fsidp->Fsid_dev.Major = fhp[6]; 259 fsidp->fsid_code = 0; 260 261 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 262 *inop = temp; 263 264 if (osnamep) 265 *osnamep = "Auspex"; 266 break; 267 268 case FHT_DECOSF: 269 fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); 270 /* XXX could ignore 3 high-order bytes */ 271 272 temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]); 273 fsidp->Fsid_dev.Minor = temp & 0xFFFFF; 274 fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF; 275 276 temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]); 277 *inop = temp; 278 if (osnamep) 279 *osnamep = "OSF"; 280 break; 281 282 case FHT_IRIX4: 283 fsidp->Fsid_dev.Minor = fhp[3]; 284 fsidp->Fsid_dev.Major = fhp[2]; 285 fsidp->fsid_code = 0; 286 287 temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]); 288 *inop = temp; 289 290 if (osnamep) 291 *osnamep = "IRIX4"; 292 break; 293 294 case FHT_IRIX5: 295 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); 296 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); 297 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 298 299 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 300 *inop = temp; 301 302 if (osnamep) 303 *osnamep = "IRIX5"; 304 break; 305 306 case FHT_SUNOS3: 307 if (osnamep) 308 *osnamep = "SUNOS3"; 309 break; 310 311 case FHT_SUNOS4: 312 fsidp->Fsid_dev.Minor = fhp[3]; 313 fsidp->Fsid_dev.Major = fhp[2]; 314 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 315 316 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 317 *inop = temp; 318 319 if (osnamep) 320 *osnamep = "SUNOS4"; 321 break; 322 323 case FHT_SUNOS5: 324 temp = make_uint16(fhp[0], fhp[1]); 325 fsidp->Fsid_dev.Major = (temp>>2) & 0x3FFF; 326 temp = make_uint24(fhp[1], fhp[2], fhp[3]); 327 fsidp->Fsid_dev.Minor = temp & 0x3FFFF; 328 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 329 330 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 331 *inop = temp; 332 333 if (osnamep) 334 *osnamep = "SUNOS5"; 335 break; 336 337 case FHT_ULTRIX: 338 fsidp->fsid_code = 0; 339 fsidp->Fsid_dev.Minor = fhp[0]; 340 fsidp->Fsid_dev.Major = fhp[1]; 341 342 temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]); 343 *inop = temp; 344 if (osnamep) 345 *osnamep = "Ultrix"; 346 break; 347 348 case FHT_VMSUCX: 349 /* No numeric file system ID, so hash on the device-name */ 350 if (sizeof(*fsidp) >= 14) { 351 if (sizeof(*fsidp) > 14) 352 memset((char *)fsidp, 0, sizeof(*fsidp)); 353 /* just use the whole thing */ 354 memcpy((char *)fsidp, (char *)fh, 14); 355 } 356 else { 357 u_int32_t tempa[4]; /* at least 16 bytes, maybe more */ 358 359 memset((char *)tempa, 0, sizeof(tempa)); 360 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */ 361 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1); 362 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1); 363 fsidp->fsid_code = 0; 364 } 365 366 /* VMS file ID is: (RVN, FidHi, FidLo) */ 367 *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]); 368 369 /* Caller must save (and null-terminate?) this value */ 370 if (fsnamep) 371 *fsnamep = (char *)&(fhp[1]); 372 373 if (osnamep) 374 *osnamep = "VMS"; 375 break; 376 377 case FHT_AIX32: 378 fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]); 379 fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]); 380 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 381 382 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 383 *inop = temp; 384 385 if (osnamep) 386 *osnamep = "AIX32"; 387 break; 388 389 case FHT_HPUX9: 390 fsidp->Fsid_dev.Major = fhp[0]; 391 temp = make_uint24(fhp[1], fhp[2], fhp[3]); 392 fsidp->Fsid_dev.Minor = temp; 393 fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]); 394 395 temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]); 396 *inop = temp; 397 398 if (osnamep) 399 *osnamep = "HPUX9"; 400 break; 401 402 case FHT_UNKNOWN: 403 #ifdef DEBUG 404 /* XXX debugging */ 405 for (i = 0; i < 32; i++) 406 (void)fprintf(stderr, "%x.", fhp[i]); 407 (void)fprintf(stderr, "\n"); 408 #endif 409 /* Save the actual handle, so it can be display with -u */ 410 for (i = 0; i < 32; i++) 411 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]); 412 413 /* XXX for now, give "bogus" values to aid debugging */ 414 fsidp->fsid_code = 0; 415 fsidp->Fsid_dev.Minor = 257; 416 fsidp->Fsid_dev.Major = 257; 417 *inop = 1; 418 419 /* display will show this string instead of (257,257) */ 420 if (fsnamep) 421 *fsnamep = "Unknown"; 422 423 if (osnamep) 424 *osnamep = "Unknown"; 425 break; 426 427 } 428 } 429 430 /* 431 * Is this a VMS UCX file handle? 432 * Check for: 433 * (1) leading code byte [XXX not yet] 434 * (2) followed by string of printing chars & spaces 435 * (3) followed by string of nulls 436 */ 437 static int 438 is_UCX(fhp) 439 const unsigned char *fhp; 440 { 441 register int i; 442 int seen_null = 0; 443 444 for (i = 1; i < 14; i++) { 445 if (isprint(fhp[i])) { 446 if (seen_null) 447 return(0); 448 else 449 continue; 450 } 451 else if (fhp[i] == 0) { 452 seen_null = 1; 453 continue; 454 } 455 else 456 return(0); 457 } 458 459 return(1); 460 } 461