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 <tcpdump-stdinc.h>
  48
  49 #include <stdio.h>
  50 #include <string.h>
  51
  52 #include "interface.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 #ifdef  __alpha
  96         /* or other 64-bit systems */
  97 #define make_uint48(msb,b,c,d,e,lsb)\
  98         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
  99 #else
 100         /* on 32-bit systems ignore high-order bits */
 101 #define make_uint48(msb,b,c,d,e,lsb)\
 102         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
 103 #endif
 104
 105 static int is_UCX(const unsigned char *);
 106
 107 void
 108 Parse_fh(register const unsigned char *fh, int len _U_, my_fsid *fsidp,
 109          uint32_t *inop,
 110          const char **osnamep, /* if non-NULL, return OS name here */
 111          const char **fsnamep, /* if non-NULL, return server fs name here (for VMS) */
 112          int ourself)   /* true if file handle was generated on this host */
 113 {
 114         register const unsigned char *fhp = fh;
 115         uint32_t temp;
 116         int fhtype = FHT_UNKNOWN;
 117         int i;
 118
 119         if (ourself) {
 120             /* File handle generated on this host, no need for guessing */
 121 #if     defined(IRIX40)
 122             fhtype = FHT_IRIX4;
 123 #endif
 124 #if     defined(IRIX50)
 125             fhtype = FHT_IRIX5;
 126 #endif
 127 #if     defined(IRIX51)
 128             fhtype = FHT_IRIX5;
 129 #endif
 130 #if     defined(SUNOS4)
 131             fhtype = FHT_SUNOS4;
 132 #endif
 133 #if     defined(SUNOS5)
 134             fhtype = FHT_SUNOS5;
 135 #endif
 136 #if     defined(ultrix)
 137             fhtype = FHT_ULTRIX;
 138 #endif
 139 #if     defined(__osf__)
 140             fhtype = FHT_DECOSF;
 141 #endif
 142 #if     defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
 143      || defined(__OpenBSD__)
 144             fhtype = FHT_BSD44;
 145 #endif
 146         }
 147         /*
 148          * This is basically a big decision tree
 149          */
 150         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 151             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 152             /* probably rules out HP-UX, AIX unless they allow major=0 */
 153             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 154                 /* bytes[2,3] == (0,0); must be Auspex */
 155                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 156                 fhtype = FHT_AUSPEX;
 157             }
 158             else {
 159                 /*
 160                  * bytes[2,3] != (0,0); rules out Auspex, could be
 161                  * DECOSF, SUNOS4, or IRIX4
 162                  */
 163                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 164                         (fhp[8] == 12) && (fhp[9] == 0)) {
 165                     /* seems to be DECOSF, with minor == 0 */
 166                     fhtype = FHT_DECOSF;
 167                 }
 168                 else {
 169                     /* could be SUNOS4 or IRIX4 */
 170                     /* XXX the test of fhp[5] == 8 could be wrong */
 171                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 172                         (fhp[7] == 0)) {
 173                         /* looks like a length, not a file system typecode */
 174                         fhtype = FHT_IRIX4;
 175                     }
 176                     else {
 177                         /* by elimination */
 178                         fhtype = FHT_SUNOS4;
 179                     }
 180                 }
 181             }
 182         }
 183         else {
 184             /*
 185              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 186              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 187              * could be AIX, HP-UX
 188              */
 189             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 190                 /*
 191                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 192                  * (unless the exported device name is just one letter!),
 193                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 194                  * might be HP-UX (depends on their values for minor devs)
 195                  */
 196                 if ((fhp[6] == 0) && (fhp[7] == 0)) {
 197                     fhtype = FHT_BSD44;
 198                 }
 199                 /*XXX we probably only need to test of these two bytes */
 200                 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
 201                     fhtype = FHT_ULTRIX;
 202                 }
 203                 else {
 204                     /* Could be SUNOS5/IRIX5, maybe AIX */
 205                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 206                     if (fhp[9] == 10)
 207                         fhtype = FHT_SUNOS5;
 208                     /* XXX what about AIX? */
 209                 }
 210             }
 211             else {
 212                 /*
 213                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 214                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 215                  */
 216                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 217                     fhtype = FHT_DECOSF;
 218                 }
 219                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 220                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 221                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 222                         (fhp[5] == 0) && (fhp[4] == 0)) {
 223                         /* XXX is this always true of HP-UX? */
 224                         fhtype = FHT_HPUX9;
 225                     }
 226                     else if (fhp[7] == 2) {
 227                         /* This would be MNT_NFS on AIX, which is impossible */
 228                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 229                     }
 230                     else {
 231                         /*
 232                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 233                          * XXX see any way to disambiguate these, so
 234                          * XXX I'm going with the more likely guess.
 235                          * XXX Sorry, Big Blue.
 236                          */
 237                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 238                     }
 239                 }
 240                 else {
 241                     if (is_UCX(fhp)) {
 242                         fhtype = FHT_VMSUCX;
 243                     }
 244                     else {
 245                         fhtype = FHT_UNKNOWN;
 246                     }
 247                 }
 248             }
 249         }
 250
 251         /* XXX still needs to handle SUNOS3 */
 252
 253         switch (fhtype) {
 254         case FHT_AUSPEX:
 255             fsidp->Fsid_dev.Minor = fhp[7];
 256             fsidp->Fsid_dev.Major = fhp[6];
 257             fsidp->fsid_code = 0;
 258
 259             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 260
 261             if (osnamep)
 262                 *osnamep = "Auspex";
 263             break;
 264
 265         case FHT_BSD44:
 266             fsidp->Fsid_dev.Minor = fhp[0];
 267             fsidp->Fsid_dev.Major = fhp[1];
 268             fsidp->fsid_code = 0;
 269
 270             *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 271
 272             if (osnamep)
 273                 *osnamep = "BSD 4.4";
 274             break;
 275
 276         case FHT_DECOSF:
 277             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 278                         /* XXX could ignore 3 high-order bytes */
 279
 280             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 281             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 282             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 283
 284             *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 285             if (osnamep)
 286                 *osnamep = "OSF";
 287             break;
 288
 289         case FHT_IRIX4:
 290             fsidp->Fsid_dev.Minor = fhp[3];
 291             fsidp->Fsid_dev.Major = fhp[2];
 292             fsidp->fsid_code = 0;
 293
 294             *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 295
 296             if (osnamep)
 297                 *osnamep = "IRIX4";
 298             break;
 299
 300         case FHT_IRIX5:
 301             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 302             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 303             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 304
 305             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 306
 307             if (osnamep)
 308                 *osnamep = "IRIX5";
 309             break;
 310
 311 #ifdef notdef
 312         case FHT_SUNOS3:
 313             /*
 314              * XXX - none of the heuristics above return this.
 315              * Are there any SunOS 3.x systems around to care about?
 316              */
 317             if (osnamep)
 318                 *osnamep = "SUNOS3";
 319             break;
 320 #endif
 321
 322         case FHT_SUNOS4:
 323             fsidp->Fsid_dev.Minor = fhp[3];
 324             fsidp->Fsid_dev.Major = fhp[2];
 325             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 326
 327             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 328
 329             if (osnamep)
 330                 *osnamep = "SUNOS4";
 331             break;
 332
 333         case FHT_SUNOS5:
 334             temp = make_uint16(fhp[0], fhp[1]);
 335             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 336             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 337             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 338             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 339
 340             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 341
 342             if (osnamep)
 343                 *osnamep = "SUNOS5";
 344             break;
 345
 346         case FHT_ULTRIX:
 347             fsidp->fsid_code = 0;
 348             fsidp->Fsid_dev.Minor = fhp[0];
 349             fsidp->Fsid_dev.Major = fhp[1];
 350
 351             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 352             *inop = temp;
 353             if (osnamep)
 354                 *osnamep = "Ultrix";
 355             break;
 356
 357         case FHT_VMSUCX:
 358             /* No numeric file system ID, so hash on the device-name */
 359             if (sizeof(*fsidp) >= 14) {
 360                 if (sizeof(*fsidp) > 14)
 361                     memset((char *)fsidp, 0, sizeof(*fsidp));
 362                 /* just use the whole thing */
 363                 memcpy((char *)fsidp, (const char *)fh, 14);
 364             }
 365             else {
 366                 uint32_t tempa[4];      /* at least 16 bytes, maybe more */
 367
 368                 memset((char *)tempa, 0, sizeof(tempa));
 369                 memcpy((char *)tempa, (const char *)fh, 14); /* ensure alignment */
 370                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 371                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 372                 fsidp->fsid_code = 0;
 373             }
 374
 375             /* VMS file ID is: (RVN, FidHi, FidLo) */
 376             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 377
 378             /* Caller must save (and null-terminate?) this value */
 379             if (fsnamep)
 380                 *fsnamep = (const char *)&(fhp[1]);
 381
 382             if (osnamep)
 383                 *osnamep = "VMS";
 384             break;
 385
 386         case FHT_AIX32:
 387             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 388             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 389             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 390
 391             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 392
 393             if (osnamep)
 394                 *osnamep = "AIX32";
 395             break;
 396
 397         case FHT_HPUX9:
 398             fsidp->Fsid_dev.Major = fhp[0];
 399             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 400             fsidp->Fsid_dev.Minor = temp;
 401             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 402
 403             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 404
 405             if (osnamep)
 406                 *osnamep = "HPUX9";
 407             break;
 408
 409         case FHT_UNKNOWN:
 410 #ifdef DEBUG
 411             /* XXX debugging */
 412             for (i = 0; i < 32; i++)
 413                 (void)fprintf(stderr, "%x.", fhp[i]);
 414             (void)fprintf(stderr, "\n");
 415 #endif
 416             /* Save the actual handle, so it can be display with -u */
 417             for (i = 0; i < 32; i++)
 418                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 419
 420             /* XXX for now, give "bogus" values to aid debugging */
 421             fsidp->fsid_code = 0;
 422             fsidp->Fsid_dev.Minor = 257;
 423             fsidp->Fsid_dev.Major = 257;
 424             *inop = 1;
 425
 426             /* display will show this string instead of (257,257) */
 427             if (fsnamep)
 428                 *fsnamep = "Unknown";
 429
 430             if (osnamep)
 431                 *osnamep = "Unknown";
 432             break;
 433
 434         }
 435 }
 436
 437 /*
 438  * Is this a VMS UCX file handle?
 439  *      Check for:
 440  *      (1) leading code byte   [XXX not yet]
 441  *      (2) followed by string of printing chars & spaces
 442  *      (3) followed by string of nulls
 443  */
 444 static int
 445 is_UCX(const unsigned char *fhp)
 446 {
 447         register int i;
 448         int seen_null = 0;
 449
 450         for (i = 1; i < 14; i++) {
 451             if (ND_ISPRINT(fhp[i])) {
 452                 if (seen_null)
 453                    return(0);
 454                 else
 455                    continue;
 456             }
 457             else if (fhp[i] == 0) {
 458                 seen_null = 1;
 459                 continue;
 460             }
 461             else
 462                 return(0);
 463         }
 464
 465         return(1);
 466 }