dist/tcpdump/parsenfsfh.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1993, 1994 Jeffrey C. Mogul, Digital Equipment Corporation,
   5  * Western Research Laboratory. All rights reserved.
   6  * Copyright (c) 2001 Compaq Computer Corporation. All rights reserved.
   7  *
   8  *  Permission to use, copy, and modify this software and its
   9  *  documentation is hereby granted only under the following terms and
  10  *  conditions.  Both the above copyright notice and this permission
  11  *  notice must appear in all copies of the software, derivative works
  12  *  or modified versions, and any portions thereof, and both notices
  13  *  must appear in supporting documentation.
  14  *
  15  *  Redistribution and use in source and binary forms, with or without
  16  *  modification, are permitted provided that the following conditions
  17  *  are met:
  18  *    1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  *    2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in
  22  *    the documentation and/or other materials provided with the
  23  *    distribution.
  24  *
  25  *  THE SOFTWARE IS PROVIDED "AS IS" AND COMPAQ COMPUTER CORPORATION
  26  *  DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  27  *  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.   IN NO
  28  *  EVENT SHALL COMPAQ COMPUTER CORPORATION BE LIABLE FOR ANY
  29  *  SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  30  *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  31  *  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  32  *  OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  33  *  SOFTWARE.
  34  */
  35
  36 /*
  37  * parsenfsfh.c - portable parser for NFS file handles
  38  *                      uses all sorts of heuristics
  39  *
  40  * Jeffrey C. Mogul
  41  * Digital Equipment Corporation
  42  * Western Research Laboratory
  43  */
  44
  45 #include <sys/cdefs.h>
  46 #ifndef lint
  47 #if 0
  48 static const char rcsid[] _U_ =
  49     "@(#) Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.28.2.1 2007/06/15 19:15:04 guy Exp (LBL)";
  50 #else
  51 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  52 #endif
  53 #endif
  54
  55 #ifdef HAVE_CONFIG_H
  56 #include "config.h"
  57 #endif
  58
  59 #include <tcpdump-stdinc.h>
  60
  61 #include <stdio.h>
  62 #include <string.h>
  63
  64 #include "interface.h"
  65 #include "nfsfh.h"
  66
  67 /*
  68  * This routine attempts to parse a file handle (in network byte order),
  69  * using heuristics to guess what kind of format it is in.  See the
  70  * file "fhandle_layouts" for a detailed description of the various
  71  * patterns we know about.
  72  *
  73  * The file handle is parsed into our internal representation of a
  74  * file-system id, and an internal representation of an inode-number.
  75  */
  76
  77 #define FHT_UNKNOWN     0
  78 #define FHT_AUSPEX      1
  79 #define FHT_DECOSF      2
  80 #define FHT_IRIX4       3
  81 #define FHT_IRIX5       4
  82 #define FHT_SUNOS3      5
  83 #define FHT_SUNOS4      6
  84 #define FHT_ULTRIX      7
  85 #define FHT_VMSUCX      8
  86 #define FHT_SUNOS5      9
  87 #define FHT_AIX32       10
  88 #define FHT_HPUX9       11
  89 #define FHT_BSD44       12
  90
  91 #ifdef  ultrix
  92 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  93 #define XFF(x)  ((u_int32_t)(x))
  94 #else
  95 #define XFF(x)  (x)
  96 #endif
  97
  98 #define make_uint32(msb,b,c,lsb)\
  99         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
 100
 101 #define make_uint24(msb,b, lsb)\
 102         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
 103
 104 #define make_uint16(msb,lsb)\
 105         (XFF(lsb) + (XFF(msb)<<8))
 106
 107 #ifdef  __alpha
 108         /* or other 64-bit systems */
 109 #define make_uint48(msb,b,c,d,e,lsb)\
 110         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
 111 #else
 112         /* on 32-bit systems ignore high-order bits */
 113 #define make_uint48(msb,b,c,d,e,lsb)\
 114         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
 115 #endif
 116
 117 static int is_UCX(const unsigned char *);
 118
 119 void
 120 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
 121 register const unsigned char *fh;
 122 int len _U_;
 123 my_fsid *fsidp;
 124 ino_t *inop;
 125 const char **osnamep;           /* if non-NULL, return OS name here */
 126 const char **fsnamep;           /* if non-NULL, return server fs name here (for VMS) */
 127 int ourself;            /* true if file handle was generated on this host */
 128 {
 129         register const unsigned char *fhp = fh;
 130         u_int32_t temp;
 131         int fhtype = FHT_UNKNOWN;
 132         int i;
 133
 134         if (ourself) {
 135             /* File handle generated on this host, no need for guessing */
 136 #if     defined(IRIX40)
 137             fhtype = FHT_IRIX4;
 138 #endif
 139 #if     defined(IRIX50)
 140             fhtype = FHT_IRIX5;
 141 #endif
 142 #if     defined(IRIX51)
 143             fhtype = FHT_IRIX5;
 144 #endif
 145 #if     defined(SUNOS4)
 146             fhtype = FHT_SUNOS4;
 147 #endif
 148 #if     defined(SUNOS5)
 149             fhtype = FHT_SUNOS5;
 150 #endif
 151 #if     defined(ultrix)
 152             fhtype = FHT_ULTRIX;
 153 #endif
 154 #if     defined(__osf__)
 155             fhtype = FHT_DECOSF;
 156 #endif
 157 #if     defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
 158      || defined(__OpenBSD__)
 159             fhtype = FHT_BSD44;
 160 #endif
 161         }
 162         /*
 163          * This is basically a big decision tree
 164          */
 165         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 166             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 167             /* probably rules out HP-UX, AIX unless they allow major=0 */
 168             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 169                 /* bytes[2,3] == (0,0); must be Auspex */
 170                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 171                 fhtype = FHT_AUSPEX;
 172             }
 173             else {
 174                 /*
 175                  * bytes[2,3] != (0,0); rules out Auspex, could be
 176                  * DECOSF, SUNOS4, or IRIX4
 177                  */
 178                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 179                         (fhp[8] == 12) && (fhp[9] == 0)) {
 180                     /* seems to be DECOSF, with minor == 0 */
 181                     fhtype = FHT_DECOSF;
 182                 }
 183                 else {
 184                     /* could be SUNOS4 or IRIX4 */
 185                     /* XXX the test of fhp[5] == 8 could be wrong */
 186                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 187                         (fhp[7] == 0)) {
 188                         /* looks like a length, not a file system typecode */
 189                         fhtype = FHT_IRIX4;
 190                     }
 191                     else {
 192                         /* by elimination */
 193                         fhtype = FHT_SUNOS4;
 194                     }
 195                 }
 196             }
 197         }
 198         else {
 199             /*
 200              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 201              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 202              * could be AIX, HP-UX
 203              */
 204             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 205                 /*
 206                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 207                  * (unless the exported device name is just one letter!),
 208                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 209                  * might be HP-UX (depends on their values for minor devs)
 210                  */
 211                 if ((fhp[6] == 0) && (fhp[7] == 0)) {
 212                     fhtype = FHT_BSD44;
 213                 }
 214                 /*XXX we probably only need to test of these two bytes */
 215                 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
 216                     fhtype = FHT_ULTRIX;
 217                 }
 218                 else {
 219                     /* Could be SUNOS5/IRIX5, maybe AIX */
 220                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 221                     if (fhp[9] == 10)
 222                         fhtype = FHT_SUNOS5;
 223                     /* XXX what about AIX? */
 224                 }
 225             }
 226             else {
 227                 /*
 228                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 229                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 230                  */
 231                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 232                     fhtype = FHT_DECOSF;
 233                 }
 234                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 235                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 236                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 237                         (fhp[5] == 0) && (fhp[4] == 0)) {
 238                         /* XXX is this always true of HP-UX? */
 239                         fhtype = FHT_HPUX9;
 240                     }
 241                     else if (fhp[7] == 2) {
 242                         /* This would be MNT_NFS on AIX, which is impossible */
 243                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 244                     }
 245                     else {
 246                         /*
 247                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 248                          * XXX see any way to disambiguate these, so
 249                          * XXX I'm going with the more likely guess.
 250                          * XXX Sorry, Big Blue.
 251                          */
 252                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 253                     }
 254                 }
 255                 else {
 256                     if (is_UCX(fhp)) {
 257                         fhtype = FHT_VMSUCX;
 258                     }
 259                     else {
 260                         fhtype = FHT_UNKNOWN;
 261                     }
 262                 }
 263             }
 264         }
 265
 266         /* XXX still needs to handle SUNOS3 */
 267
 268         switch (fhtype) {
 269         case FHT_AUSPEX:
 270             fsidp->Fsid_dev.Minor = fhp[7];
 271             fsidp->Fsid_dev.Major = fhp[6];
 272             fsidp->fsid_code = 0;
 273
 274             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 275             *inop = temp;
 276
 277             if (osnamep)
 278                 *osnamep = "Auspex";
 279             break;
 280
 281         case FHT_BSD44:
 282             fsidp->Fsid_dev.Minor = fhp[0];
 283             fsidp->Fsid_dev.Major = fhp[1];
 284             fsidp->fsid_code = 0;
 285
 286             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 287             *inop = temp;
 288
 289             if (osnamep)
 290                 *osnamep = "BSD 4.4";
 291             break;
 292
 293         case FHT_DECOSF:
 294             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 295                         /* XXX could ignore 3 high-order bytes */
 296
 297             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 298             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 299             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 300
 301             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 302             *inop = temp;
 303             if (osnamep)
 304                 *osnamep = "OSF";
 305             break;
 306
 307         case FHT_IRIX4:
 308             fsidp->Fsid_dev.Minor = fhp[3];
 309             fsidp->Fsid_dev.Major = fhp[2];
 310             fsidp->fsid_code = 0;
 311
 312             temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 313             *inop = temp;
 314
 315             if (osnamep)
 316                 *osnamep = "IRIX4";
 317             break;
 318
 319         case FHT_IRIX5:
 320             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 321             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 322             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 323
 324             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 325             *inop = temp;
 326
 327             if (osnamep)
 328                 *osnamep = "IRIX5";
 329             break;
 330
 331 #ifdef notdef
 332         case FHT_SUNOS3:
 333             /*
 334              * XXX - none of the heuristics above return this.
 335              * Are there any SunOS 3.x systems around to care about?
 336              */
 337             if (osnamep)
 338                 *osnamep = "SUNOS3";
 339             break;
 340 #endif
 341
 342         case FHT_SUNOS4:
 343             fsidp->Fsid_dev.Minor = fhp[3];
 344             fsidp->Fsid_dev.Major = fhp[2];
 345             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 346
 347             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 348             *inop = temp;
 349
 350             if (osnamep)
 351                 *osnamep = "SUNOS4";
 352             break;
 353
 354         case FHT_SUNOS5:
 355             temp = make_uint16(fhp[0], fhp[1]);
 356             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 357             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 358             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 359             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 360
 361             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 362             *inop = temp;
 363
 364             if (osnamep)
 365                 *osnamep = "SUNOS5";
 366             break;
 367
 368         case FHT_ULTRIX:
 369             fsidp->fsid_code = 0;
 370             fsidp->Fsid_dev.Minor = fhp[0];
 371             fsidp->Fsid_dev.Major = fhp[1];
 372
 373             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 374             *inop = temp;
 375             if (osnamep)
 376                 *osnamep = "Ultrix";
 377             break;
 378
 379         case FHT_VMSUCX:
 380             /* No numeric file system ID, so hash on the device-name */
 381             if (sizeof(*fsidp) >= 14) {
 382                 if (sizeof(*fsidp) > 14)
 383                     memset((char *)fsidp, 0, sizeof(*fsidp));
 384                 /* just use the whole thing */
 385                 memcpy((char *)fsidp, (char *)fh, 14);
 386             }
 387             else {
 388                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 389
 390                 memset((char *)tempa, 0, sizeof(tempa));
 391                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 392                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 393                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 394                 fsidp->fsid_code = 0;
 395             }
 396
 397             /* VMS file ID is: (RVN, FidHi, FidLo) */
 398             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 399
 400             /* Caller must save (and null-terminate?) this value */
 401             if (fsnamep)
 402                 *fsnamep = (char *)&(fhp[1]);
 403
 404             if (osnamep)
 405                 *osnamep = "VMS";
 406             break;
 407
 408         case FHT_AIX32:
 409             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 410             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 411             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 412
 413             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 414             *inop = temp;
 415
 416             if (osnamep)
 417                 *osnamep = "AIX32";
 418             break;
 419
 420         case FHT_HPUX9:
 421             fsidp->Fsid_dev.Major = fhp[0];
 422             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 423             fsidp->Fsid_dev.Minor = temp;
 424             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 425
 426             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 427             *inop = temp;
 428
 429             if (osnamep)
 430                 *osnamep = "HPUX9";
 431             break;
 432
 433         case FHT_UNKNOWN:
 434 #ifdef DEBUG
 435             /* XXX debugging */
 436             for (i = 0; i < 32; i++)
 437                 (void)fprintf(stderr, "%x.", fhp[i]);
 438             (void)fprintf(stderr, "\n");
 439 #endif
 440             /* Save the actual handle, so it can be display with -u */
 441             for (i = 0; i < 32; i++)
 442                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 443
 444             /* XXX for now, give "bogus" values to aid debugging */
 445             fsidp->fsid_code = 0;
 446             fsidp->Fsid_dev.Minor = 257;
 447             fsidp->Fsid_dev.Major = 257;
 448             *inop = 1;
 449
 450             /* display will show this string instead of (257,257) */
 451             if (fsnamep)
 452                 *fsnamep = "Unknown";
 453
 454             if (osnamep)
 455                 *osnamep = "Unknown";
 456             break;
 457
 458         }
 459 }
 460
 461 /*
 462  * Is this a VMS UCX file handle?
 463  *      Check for:
 464  *      (1) leading code byte   [XXX not yet]
 465  *      (2) followed by string of printing chars & spaces
 466  *      (3) followed by string of nulls
 467  */
 468 static int
 469 is_UCX(fhp)
 470 const unsigned char *fhp;
 471 {
 472         register int i;
 473         int seen_null = 0;
 474
 475         for (i = 1; i < 14; i++) {
 476             if (isprint(fhp[i])) {
 477                 if (seen_null)
 478                    return(0);
 479                 else
 480                    continue;
 481             }
 482             else if (fhp[i] == 0) {
 483                 seen_null = 1;
 484                 continue;
 485             }
 486             else
 487                 return(0);
 488         }
 489
 490         return(1);
 491 }