The Tcpdump Group git mirrors - tcpdump/blob - parsenfsfh.c

   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[] =
  45     "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.21 2001-06-18 08:39:36 itojun Exp $ (LBL)";
  46 #endif
  47
  48 #ifdef HAVE_CONFIG_H
  49 #include "config.h"
  50 #endif
  51
  52 #include <sys/types.h>
  53 #include <sys/time.h>
  54
  55 #include <ctype.h>
  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_NETBSDEL    12
  85 #define FHT_NETBSDEB    13
  86
  87 #ifdef  ultrix
  88 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  89 #define XFF(x)  ((u_int32_t)(x))
  90 #else
  91 #define XFF(x)  (x)
  92 #endif
  93
  94 #define make_uint32(msb,b,c,lsb)\
  95         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
  96
  97 #define make_uint24(msb,b, lsb)\
  98         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
  99
 100 #define make_uint16(msb,lsb)\
 101         (XFF(lsb) + (XFF(msb)<<8))
 102
 103 #ifdef  __alpha
 104         /* or other 64-bit systems */
 105 #define make_uint48(msb,b,c,d,e,lsb)\
 106         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
 107 #else
 108         /* on 32-bit systems ignore high-order bits */
 109 #define make_uint48(msb,b,c,d,e,lsb)\
 110         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
 111 #endif
 112
 113 static int is_UCX(unsigned char *);
 114
 115 void
 116 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
 117 register caddr_t *fh;
 118 int len;
 119 my_fsid *fsidp;
 120 ino_t *inop;
 121 char **osnamep;         /* if non-NULL, return OS name here */
 122 char **fsnamep;         /* if non-NULL, return server fs name here (for VMS) */
 123 int ourself;            /* true if file handle was generated on this host */
 124 {
 125         register unsigned char *fhp = (unsigned char *)fh;
 126         u_int32_t temp;
 127         int fhtype = FHT_UNKNOWN;
 128         int i;
 129
 130         if (ourself) {
 131             /* File handle generated on this host, no need for guessing */
 132 #if     defined(IRIX40)
 133             fhtype = FHT_IRIX4;
 134 #endif
 135 #if     defined(IRIX50)
 136             fhtype = FHT_IRIX5;
 137 #endif
 138 #if     defined(IRIX51)
 139             fhtype = FHT_IRIX5;
 140 #endif
 141 #if     defined(SUNOS4)
 142             fhtype = FHT_SUNOS4;
 143 #endif
 144 #if     defined(SUNOS5)
 145             fhtype = FHT_SUNOS5;
 146 #endif
 147 #if     defined(ultrix)
 148             fhtype = FHT_ULTRIX;
 149 #endif
 150 #if     defined(__osf__)
 151             fhtype = FHT_DECOSF;
 152 #endif
 153 #if     defined(__NetBSD__)
 154 #if     BYTE_ORDER == LITTLE_ENDIAN
 155             fhtype = FHT_NETBSDEL;
 156 #else
 157             fhtype = FHT_NETBSDEB;
 158 #endif
 159 #endif
 160         }
 161         /*
 162          * This is basically a big decision tree
 163          */
 164         else if (fhp[8] == 12 && fhp[9] == 0 && fhp[10] == 0 && fhp[11] == 0)
 165             /*
 166              * bytes[8,9] = (12,0); sizeof(struct ufid).
 167              * bytes[10,11] = (0,0); pad.
 168              */
 169             fhtype = FHT_NETBSDEL;
 170         else if (fhp[8] == 0 && fhp[9] == 12 && fhp[10] == 0 && fhp[11] == 0)
 171             /*
 172              * ... same as above but from big-endian machine.
 173              */
 174             fhtype = FHT_NETBSDEB;
 175         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 176             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 177             /* probably rules out HP-UX, AIX unless they allow major=0 */
 178             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 179                 /* bytes[2,3] == (0,0); must be Auspex */
 180                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 181                 fhtype = FHT_AUSPEX;
 182             }
 183             else {
 184                 /*
 185                  * bytes[2,3] != (0,0); rules out Auspex, could be
 186                  * DECOSF, SUNOS4, or IRIX4
 187                  */
 188                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 189                         (fhp[8] == 12) && (fhp[9] == 0)) {
 190                     /* seems to be DECOSF, with minor == 0 */
 191                     fhtype = FHT_DECOSF;
 192                 }
 193                 else {
 194                     /* could be SUNOS4 or IRIX4 */
 195                     /* XXX the test of fhp[5] == 8 could be wrong */
 196                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 197                         (fhp[7] == 0)) {
 198                         /* looks like a length, not a file system typecode */
 199                         fhtype = FHT_IRIX4;
 200                     }
 201                     else {
 202                         /* by elimination */
 203                         fhtype = FHT_SUNOS4;
 204                     }
 205                 }
 206             }
 207         }
 208         else {
 209             /*
 210              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 211              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 212              * could be AIX, HP-UX
 213              */
 214             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 215                 /*
 216                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 217                  * (unless the exported device name is just one letter!),
 218                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 219                  * might be HP-UX (depends on their values for minor devs)
 220                  */
 221                 /*XXX we probably only need to test of these two bytes */
 222                 if ((fhp[21] == 0) && (fhp[23] == 0)) {
 223                     fhtype = FHT_ULTRIX;
 224                 }
 225                 else {
 226                     /* Could be SUNOS5/IRIX5, maybe AIX */
 227                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 228                     if (fhp[9] == 10)
 229                         fhtype = FHT_SUNOS5;
 230                     /* XXX what about AIX? */
 231                 }
 232             }
 233             else {
 234                 /*
 235                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 236                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 237                  */
 238                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 239                     fhtype = FHT_DECOSF;
 240                 }
 241                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 242                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 243                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 244                         (fhp[5] == 0) && (fhp[4] == 0)) {
 245                         /* XXX is this always true of HP-UX? */
 246                         fhtype = FHT_HPUX9;
 247                     }
 248                     else if (fhp[7] == 2) {
 249                         /* This would be MNT_NFS on AIX, which is impossible */
 250                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 251                     }
 252                     else {
 253                         /*
 254                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 255                          * XXX see any way to disambiguate these, so
 256                          * XXX I'm going with the more likely guess.
 257                          * XXX Sorry, Big Blue.
 258                          */
 259                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 260                     }
 261                 }
 262                 else {
 263                     if (is_UCX(fhp)) {
 264                         fhtype = FHT_VMSUCX;
 265                     }
 266                     else {
 267                         fhtype = FHT_UNKNOWN;
 268                     }
 269                 }
 270             }
 271         }
 272
 273         /* XXX still needs to handle SUNOS3 */
 274
 275         switch (fhtype) {
 276         case FHT_AUSPEX:
 277             fsidp->Fsid_dev.Minor = fhp[7];
 278             fsidp->Fsid_dev.Major = fhp[6];
 279             fsidp->fsid_code = 0;
 280
 281             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 282             *inop = temp;
 283
 284             if (osnamep)
 285                 *osnamep = "Auspex";
 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         case FHT_SUNOS3:
 327             if (osnamep)
 328                 *osnamep = "SUNOS3";
 329             break;
 330
 331         case FHT_SUNOS4:
 332             fsidp->Fsid_dev.Minor = fhp[3];
 333             fsidp->Fsid_dev.Major = fhp[2];
 334             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 335
 336             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 337             *inop = temp;
 338
 339             if (osnamep)
 340                 *osnamep = "SUNOS4";
 341             break;
 342
 343         case FHT_SUNOS5:
 344             temp = make_uint16(fhp[0], fhp[1]);
 345             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 346             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 347             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 348             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 349
 350             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 351             *inop = temp;
 352
 353             if (osnamep)
 354                 *osnamep = "SUNOS5";
 355             break;
 356
 357         case FHT_ULTRIX:
 358             fsidp->fsid_code = 0;
 359             fsidp->Fsid_dev.Minor = fhp[0];
 360             fsidp->Fsid_dev.Major = fhp[1];
 361
 362             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 363             *inop = temp;
 364             if (osnamep)
 365                 *osnamep = "Ultrix";
 366             break;
 367
 368         case FHT_VMSUCX:
 369             /* No numeric file system ID, so hash on the device-name */
 370             if (sizeof(*fsidp) >= 14) {
 371                 if (sizeof(*fsidp) > 14)
 372                     memset((char *)fsidp, 0, sizeof(*fsidp));
 373                 /* just use the whole thing */
 374                 memcpy((char *)fsidp, (char *)fh, 14);
 375             }
 376             else {
 377                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 378
 379                 memset((char *)tempa, 0, sizeof(tempa));
 380                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 381                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 382                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 383                 fsidp->fsid_code = 0;
 384             }
 385
 386             /* VMS file ID is: (RVN, FidHi, FidLo) */
 387             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 388
 389             /* Caller must save (and null-terminate?) this value */
 390             if (fsnamep)
 391                 *fsnamep = (char *)&(fhp[1]);
 392
 393             if (osnamep)
 394                 *osnamep = "VMS";
 395             break;
 396
 397         case FHT_AIX32:
 398             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 399             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 400             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 401
 402             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 403             *inop = temp;
 404
 405             if (osnamep)
 406                 *osnamep = "AIX32";
 407             break;
 408
 409         case FHT_HPUX9:
 410             fsidp->Fsid_dev.Major = fhp[0];
 411             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 412             fsidp->Fsid_dev.Minor = temp;
 413             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 414
 415             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 416             *inop = temp;
 417
 418             if (osnamep)
 419                 *osnamep = "HPUX9";
 420             break;
 421
 422         case FHT_NETBSDEL:
 423 #define netbsd_major(x) ((int32_t)((((x) & 0x000fff00) >>  8)))
 424 #define netbsd_minor(x) ((int32_t)((((x) & 0xfff00000) >> 12) | \
 425                                    (((x) & 0x000000ff) >>  0)))
 426             /*
 427              * fsid_t.val[0]
 428              *
 429              * device number for a file system on real device or
 430              * some unique number for layer file system.
 431              */
 432             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 433             fsidp->Fsid_dev.Major = netbsd_major(temp);
 434             fsidp->Fsid_dev.Minor = netbsd_minor(temp);
 435
 436             /*
 437              * fsid_t.val[1]
 438              *
 439              * number based on file system type name.
 440              */
 441             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 442
 443             /*
 444              * struct fid (typically struct ufid)
 445              *
 446              * 2 octet of size of file handle followed by 2 octet of pad.
 447              */
 448
 449             /*
 450              * if struct ufid, 4 octet of inode number.  The null file
 451              * system also forwards vptofh vnode call to underlying file
 452              * system.
 453              */
 454             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 455             *inop = temp;
 456
 457             if (osnamep)
 458                 *osnamep = "NetBSDEL";
 459             break;
 460
 461         case FHT_NETBSDEB:
 462             temp = make_uint32(fhp[0], fhp[1], fhp[2], fhp[3]);
 463             fsidp->Fsid_dev.Major = netbsd_major(temp);
 464             fsidp->Fsid_dev.Minor = netbsd_minor(temp);
 465             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 466
 467             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 468             *inop = temp;
 469
 470             if (osnamep)
 471                 *osnamep = "NetBSDEB";
 472             break;
 473
 474         case FHT_UNKNOWN:
 475 #ifdef DEBUG
 476             /* XXX debugging */
 477             for (i = 0; i < 32; i++)
 478                 (void)fprintf(stderr, "%x.", fhp[i]);
 479             (void)fprintf(stderr, "\n");
 480 #endif
 481             /* Save the actual handle, so it can be display with -u */
 482             for (i = 0; i < 32; i++)
 483                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 484
 485             /* XXX for now, give "bogus" values to aid debugging */
 486             fsidp->fsid_code = 0;
 487             fsidp->Fsid_dev.Minor = 257;
 488             fsidp->Fsid_dev.Major = 257;
 489             *inop = 1;
 490
 491             /* display will show this string instead of (257,257) */
 492             if (fsnamep)
 493                 *fsnamep = "Unknown";
 494
 495             if (osnamep)
 496                 *osnamep = "Unknown";
 497             break;
 498
 499         }
 500 }
 501
 502 /*
 503  * Is this a VMS UCX file handle?
 504  *      Check for:
 505  *      (1) leading code byte   [XXX not yet]
 506  *      (2) followed by string of printing chars & spaces
 507  *      (3) followed by string of nulls
 508  */
 509 static int
 510 is_UCX(fhp)
 511 unsigned char *fhp;
 512 {
 513         register int i;
 514         int seen_null = 0;
 515
 516         for (i = 1; i < 14; i++) {
 517             if (isprint(fhp[i])) {
 518                 if (seen_null)
 519                    return(0);
 520                 else
 521                    continue;
 522             }
 523             else if (fhp[i] == 0) {
 524                 seen_null = 1;
 525                 continue;
 526             }
 527             else
 528                 return(0);
 529         }
 530
 531         return(1);
 532 }