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 #ifdef HAVE_CONFIG_H
  44 #include "config.h"
  45 #endif
  46
  47 #include <netdissect-stdinc.h>
  48
  49 #include <stdio.h>
  50 #include <string.h>
  51
  52 #include "netdissect.h"
  53 #include "nfsfh.h"
  54
  55 /*
  56  * This routine attempts to parse a file handle (in network byte order),
  57  * using heuristics to guess what kind of format it is in.  See the
  58  * file "fhandle_layouts" for a detailed description of the various
  59  * patterns we know about.
  60  *
  61  * The file handle is parsed into our internal representation of a
  62  * file-system id, and an internal representation of an inode-number.
  63  */
  64
  65 #define FHT_UNKNOWN     0
  66 #define FHT_AUSPEX      1
  67 #define FHT_DECOSF      2
  68 #define FHT_IRIX4       3
  69 #define FHT_IRIX5       4
  70 #define FHT_SUNOS3      5
  71 #define FHT_SUNOS4      6
  72 #define FHT_ULTRIX      7
  73 #define FHT_VMSUCX      8
  74 #define FHT_SUNOS5      9
  75 #define FHT_AIX32       10
  76 #define FHT_HPUX9       11
  77 #define FHT_BSD44       12
  78
  79 #ifdef  ultrix
  80 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  81 #define XFF(x)  ((uint32_t)(x))
  82 #else
  83 #define XFF(x)  (x)
  84 #endif
  85
  86 #define make_uint32(msb,b,c,lsb)\
  87         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
  88
  89 #define make_uint24(msb,b, lsb)\
  90         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
  91
  92 #define make_uint16(msb,lsb)\
  93         (XFF(lsb) + (XFF(msb)<<8))
  94
  95 static int is_UCX(const unsigned char *, u_int);
  96
  97 void
  98 Parse_fh(const unsigned char *fh, u_int len, my_fsid *fsidp,
  99          uint32_t *inop,
 100          const char **osnamep, /* if non-NULL, return OS name here */
 101          const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
 102          int ourself)   /* true if file handle was generated on this host */
 103 {
 104         const unsigned char *fhp = fh;
 105         uint32_t temp;
 106         int fhtype = FHT_UNKNOWN;
 107         u_int i;
 108
 109         /*
 110          * Require at least 16 bytes of file handle; it's variable-length
 111          * in NFSv3.  "len" is in units of 32-bit words, not bytes.
 112          */
 113         if (len < 16/4)
 114                 fhtype = FHT_UNKNOWN;
 115         else {
 116                 if (ourself) {
 117                     /* File handle generated on this host, no need for guessing */
 118 #if     defined(IRIX40)
 119                     fhtype = FHT_IRIX4;
 120 #endif
 121 #if     defined(IRIX50)
 122                     fhtype = FHT_IRIX5;
 123 #endif
 124 #if     defined(IRIX51)
 125                     fhtype = FHT_IRIX5;
 126 #endif
 127 #if     defined(SUNOS4)
 128                     fhtype = FHT_SUNOS4;
 129 #endif
 130 #if     defined(SUNOS5)
 131                     fhtype = FHT_SUNOS5;
 132 #endif
 133 #if     defined(ultrix)
 134                     fhtype = FHT_ULTRIX;
 135 #endif
 136 #if     defined(__osf__)
 137                     fhtype = FHT_DECOSF;
 138 #endif
 139 #if     defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
 140      || defined(__OpenBSD__)
 141                     fhtype = FHT_BSD44;
 142 #endif
 143                 }
 144                 /*
 145                  * This is basically a big decision tree
 146                  */
 147                 else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 148                     /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 149                     /* probably rules out HP-UX, AIX unless they allow major=0 */
 150                     if ((fhp[2] == 0) && (fhp[3] == 0)) {
 151                         /* bytes[2,3] == (0,0); must be Auspex */
 152                         /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 153                         fhtype = FHT_AUSPEX;
 154                     }
 155                     else {
 156                         /*
 157                          * bytes[2,3] != (0,0); rules out Auspex, could be
 158                          * DECOSF, SUNOS4, or IRIX4
 159                          */
 160                         if ((fhp[4] != 0) && (fhp[5] == 0) &&
 161                                 (fhp[8] == 12) && (fhp[9] == 0)) {
 162                             /* seems to be DECOSF, with minor == 0 */
 163                             fhtype = FHT_DECOSF;
 164                         }
 165                         else {
 166                             /* could be SUNOS4 or IRIX4 */
 167                             /* XXX the test of fhp[5] == 8 could be wrong */
 168                             if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 169                                 (fhp[7] == 0)) {
 170                                 /* looks like a length, not a file system typecode */
 171                                 fhtype = FHT_IRIX4;
 172                             }
 173                             else {
 174                                 /* by elimination */
 175                                 fhtype = FHT_SUNOS4;
 176                             }
 177                         }
 178                     }
 179                 }
 180                 else {
 181                     /*
 182                      * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 183                      * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 184                      * could be AIX, HP-UX
 185                      */
 186                     if ((fhp[2] == 0) && (fhp[3] == 0)) {
 187                         /*
 188                          * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 189                          * (unless the exported device name is just one letter!),
 190                          * could be Ultrix, IRIX5, AIX, or SUNOS5
 191                          * might be HP-UX (depends on their values for minor devs)
 192                          */
 193                         if ((fhp[6] == 0) && (fhp[7] == 0)) {
 194                             fhtype = FHT_BSD44;
 195                         }
 196                         /*XXX we probably only need to test of these two bytes */
 197                         else if ((len >= 24/4) && (fhp[21] == 0) && (fhp[23] == 0)) {
 198                             fhtype = FHT_ULTRIX;
 199                         }
 200                         else {
 201                             /* Could be SUNOS5/IRIX5, maybe AIX */
 202                             /* XXX no obvious difference between SUNOS5 and IRIX5 */
 203                             if (fhp[9] == 10)
 204                                 fhtype = FHT_SUNOS5;
 205                             /* XXX what about AIX? */
 206                         }
 207                     }
 208                     else {
 209                         /*
 210                          * bytes[2,3] != (0,0); rules out Ultrix, could be
 211                          * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 212                          */
 213                         if ((fhp[8] == 12) && (fhp[9] == 0)) {
 214                             fhtype = FHT_DECOSF;
 215                         }
 216                         else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 217                             /* could be SUNOS5/IRIX5, AIX, HP-UX */
 218                             if ((fhp[7] == 0) && (fhp[6] == 0) &&
 219                                 (fhp[5] == 0) && (fhp[4] == 0)) {
 220                                 /* XXX is this always true of HP-UX? */
 221                                 fhtype = FHT_HPUX9;
 222                             }
 223                             else if (fhp[7] == 2) {
 224                                 /* This would be MNT_NFS on AIX, which is impossible */
 225                                 fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 226                             }
 227                             else {
 228                                 /*
 229                                  * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 230                                  * XXX see any way to disambiguate these, so
 231                                  * XXX I'm going with the more likely guess.
 232                                  * XXX Sorry, Big Blue.
 233                                  */
 234                                 fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 235                             }
 236                         }
 237                         else {
 238                             if (is_UCX(fhp, len)) {
 239                                 fhtype = FHT_VMSUCX;
 240                             }
 241                             else {
 242                                 fhtype = FHT_UNKNOWN;
 243                             }
 244                         }
 245                     }
 246                 }
 247         }
 248
 249         /* XXX still needs to handle SUNOS3 */
 250
 251         switch (fhtype) {
 252         case FHT_AUSPEX:
 253             fsidp->Fsid_dev.Minor = fhp[7];
 254             fsidp->Fsid_dev.Major = fhp[6];
 255             fsidp->fsid_code = 0;
 256
 257             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 258
 259             if (osnamep)
 260                 *osnamep = "Auspex";
 261             break;
 262
 263         case FHT_BSD44:
 264             fsidp->Fsid_dev.Minor = fhp[0];
 265             fsidp->Fsid_dev.Major = fhp[1];
 266             fsidp->fsid_code = 0;
 267
 268             *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 269
 270             if (osnamep)
 271                 *osnamep = "BSD 4.4";
 272             break;
 273
 274         case FHT_DECOSF:
 275             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 276                         /* XXX could ignore 3 high-order bytes */
 277
 278             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 279             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 280             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 281
 282             *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 283             if (osnamep)
 284                 *osnamep = "OSF";
 285             break;
 286
 287         case FHT_IRIX4:
 288             fsidp->Fsid_dev.Minor = fhp[3];
 289             fsidp->Fsid_dev.Major = fhp[2];
 290             fsidp->fsid_code = 0;
 291
 292             *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 293
 294             if (osnamep)
 295                 *osnamep = "IRIX4";
 296             break;
 297
 298         case FHT_IRIX5:
 299             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 300             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 301             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 302
 303             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 304
 305             if (osnamep)
 306                 *osnamep = "IRIX5";
 307             break;
 308
 309 #ifdef notdef
 310         case FHT_SUNOS3:
 311             /*
 312              * XXX - none of the heuristics above return this.
 313              * Are there any SunOS 3.x systems around to care about?
 314              */
 315             if (osnamep)
 316                 *osnamep = "SUNOS3";
 317             break;
 318 #endif
 319
 320         case FHT_SUNOS4:
 321             fsidp->Fsid_dev.Minor = fhp[3];
 322             fsidp->Fsid_dev.Major = fhp[2];
 323             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 324
 325             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 326
 327             if (osnamep)
 328                 *osnamep = "SUNOS4";
 329             break;
 330
 331         case FHT_SUNOS5:
 332             temp = make_uint16(fhp[0], fhp[1]);
 333             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 334             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 335             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 336             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 337
 338             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 339
 340             if (osnamep)
 341                 *osnamep = "SUNOS5";
 342             break;
 343
 344         case FHT_ULTRIX:
 345             fsidp->fsid_code = 0;
 346             fsidp->Fsid_dev.Minor = fhp[0];
 347             fsidp->Fsid_dev.Major = fhp[1];
 348
 349             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 350             *inop = temp;
 351             if (osnamep)
 352                 *osnamep = "Ultrix";
 353             break;
 354
 355         case FHT_VMSUCX:
 356             /* No numeric file system ID, so hash on the device-name */
 357             if (sizeof(*fsidp) >= 14) {
 358                 if (sizeof(*fsidp) > 14)
 359                     memset((char *)fsidp, 0, sizeof(*fsidp));
 360                 /* just use the whole thing */
 361                 memcpy((char *)fsidp, (const char *)fh, 14);
 362             }
 363             else {
 364                 uint32_t tempa[4];      /* at least 16 bytes, maybe more */
 365
 366                 memset((char *)tempa, 0, sizeof(tempa));
 367                 memcpy((char *)tempa, (const char *)fh, 14); /* ensure alignment */
 368                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 369                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 370                 fsidp->fsid_code = 0;
 371             }
 372
 373             /* VMS file ID is: (RVN, FidHi, FidLo) */
 374             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 375
 376             /* Caller must save (and null-terminate?) this value */
 377             if (fsnamep)
 378                 *fsnamep = (const char *)&(fhp[1]);
 379
 380             if (osnamep)
 381                 *osnamep = "VMS";
 382             break;
 383
 384         case FHT_AIX32:
 385             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 386             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 387             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 388
 389             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 390
 391             if (osnamep)
 392                 *osnamep = "AIX32";
 393             break;
 394
 395         case FHT_HPUX9:
 396             fsidp->Fsid_dev.Major = fhp[0];
 397             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 398             fsidp->Fsid_dev.Minor = temp;
 399             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 400
 401             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 402
 403             if (osnamep)
 404                 *osnamep = "HPUX9";
 405             break;
 406
 407         case FHT_UNKNOWN:
 408 #ifdef DEBUG
 409             /* XXX debugging */
 410             for (i = 0; i < len*4; i++)
 411                 (void)fprintf(stderr, "%x.", fhp[i]);
 412             (void)fprintf(stderr, "\n");
 413 #endif
 414             /* Save the actual handle, so it can be display with -u */
 415             for (i = 0; i < len*4 && i*2 < sizeof(fsidp->Opaque_Handle) - 1; i++)
 416                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 417             fsidp->Opaque_Handle[i*2] = '\0';
 418
 419             /* XXX for now, give "bogus" values to aid debugging */
 420             fsidp->fsid_code = 0;
 421             fsidp->Fsid_dev.Minor = 257;
 422             fsidp->Fsid_dev.Major = 257;
 423             *inop = 1;
 424
 425             /* display will show this string instead of (257,257) */
 426             if (fsnamep)
 427                 *fsnamep = "Unknown";
 428
 429             if (osnamep)
 430                 *osnamep = "Unknown";
 431             break;
 432
 433         }
 434 }
 435
 436 /*
 437  * Is this a VMS UCX file handle?
 438  *      Check for:
 439  *      (1) leading code byte   [XXX not yet]
 440  *      (2) followed by string of printing chars & spaces
 441  *      (3) followed by string of nulls
 442  */
 443 static int
 444 is_UCX(const unsigned char *fhp, u_int len)
 445 {
 446         u_int i;
 447         int seen_null = 0;
 448
 449         /*
 450          * Require at least 28 bytes of file handle; it's variable-length
 451          * in NFSv3.  "len" is in units of 32-bit words, not bytes.
 452          */
 453         if (len < 28/4)
 454                 return(0);
 455
 456         for (i = 1; i < 14; i++) {
 457             if (ND_ISPRINT(fhp[i])) {
 458                 if (seen_null)
 459                    return(0);
 460                 else
 461                    continue;
 462             }
 463             else if (fhp[i] == 0) {
 464                 seen_null = 1;
 465                 continue;
 466             }
 467             else
 468                 return(0);
 469         }
 470
 471         return(1);
 472 }