contrib/tcpdump-3.9/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[] _U_ =
  45     "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.28.2.1 2007/06/15 19:15:04 guy Exp $ (LBL)";
  46 #endif
  47
  48 #ifdef HAVE_CONFIG_H
  49 #include "config.h"
  50 #endif
  51
  52 #include <tcpdump-stdinc.h>
  53
  54 #include <stdio.h>
  55 #include <string.h>
  56
  57 #include "interface.h"
  58 #include "nfsfh.h"
  59
  60 /*
  61  * This routine attempts to parse a file handle (in network byte order),
  62  * using heuristics to guess what kind of format it is in.  See the
  63  * file "fhandle_layouts" for a detailed description of the various
  64  * patterns we know about.
  65  *
  66  * The file handle is parsed into our internal representation of a
  67  * file-system id, and an internal representation of an inode-number.
  68  */
  69
  70 #define FHT_UNKNOWN     0
  71 #define FHT_AUSPEX      1
  72 #define FHT_DECOSF      2
  73 #define FHT_IRIX4       3
  74 #define FHT_IRIX5       4
  75 #define FHT_SUNOS3      5
  76 #define FHT_SUNOS4      6
  77 #define FHT_ULTRIX      7
  78 #define FHT_VMSUCX      8
  79 #define FHT_SUNOS5      9
  80 #define FHT_AIX32       10
  81 #define FHT_HPUX9       11
  82 #define FHT_BSD44       12
  83
  84 #ifdef  ultrix
  85 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  86 #define XFF(x)  ((u_int32_t)(x))
  87 #else
  88 #define XFF(x)  (x)
  89 #endif
  90
  91 #define make_uint32(msb,b,c,lsb)\
  92         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
  93
  94 #define make_uint24(msb,b, lsb)\
  95         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
  96
  97 #define make_uint16(msb,lsb)\
  98         (XFF(lsb) + (XFF(msb)<<8))
  99
 100 #ifdef  __alpha
 101         /* or other 64-bit systems */
 102 #define make_uint48(msb,b,c,d,e,lsb)\
 103         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
 104 #else
 105         /* on 32-bit systems ignore high-order bits */
 106 #define make_uint48(msb,b,c,d,e,lsb)\
 107         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
 108 #endif
 109
 110 static int is_UCX(const unsigned char *);
 111
 112 void
 113 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
 114 register const unsigned char *fh;
 115 int len _U_;
 116 my_fsid *fsidp;
 117 ino_t *inop;
 118 const char **osnamep;           /* if non-NULL, return OS name here */
 119 const char **fsnamep;           /* if non-NULL, return server fs name here (for VMS) */
 120 int ourself;            /* true if file handle was generated on this host */
 121 {
 122         register const unsigned char *fhp = fh;
 123         u_int32_t temp;
 124         int fhtype = FHT_UNKNOWN;
 125         int i;
 126
 127         if (ourself) {
 128             /* File handle generated on this host, no need for guessing */
 129 #if     defined(IRIX40)
 130             fhtype = FHT_IRIX4;
 131 #endif
 132 #if     defined(IRIX50)
 133             fhtype = FHT_IRIX5;
 134 #endif
 135 #if     defined(IRIX51)
 136             fhtype = FHT_IRIX5;
 137 #endif
 138 #if     defined(SUNOS4)
 139             fhtype = FHT_SUNOS4;
 140 #endif
 141 #if     defined(SUNOS5)
 142             fhtype = FHT_SUNOS5;
 143 #endif
 144 #if     defined(ultrix)
 145             fhtype = FHT_ULTRIX;
 146 #endif
 147 #if     defined(__osf__)
 148             fhtype = FHT_DECOSF;
 149 #endif
 150 #if     defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
 151      || defined(__OpenBSD__)
 152             fhtype = FHT_BSD44;
 153 #endif
 154         }
 155         /*
 156          * This is basically a big decision tree
 157          */
 158         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 159             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 160             /* probably rules out HP-UX, AIX unless they allow major=0 */
 161             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 162                 /* bytes[2,3] == (0,0); must be Auspex */
 163                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 164                 fhtype = FHT_AUSPEX;
 165             }
 166             else {
 167                 /*
 168                  * bytes[2,3] != (0,0); rules out Auspex, could be
 169                  * DECOSF, SUNOS4, or IRIX4
 170                  */
 171                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 172                         (fhp[8] == 12) && (fhp[9] == 0)) {
 173                     /* seems to be DECOSF, with minor == 0 */
 174                     fhtype = FHT_DECOSF;
 175                 }
 176                 else {
 177                     /* could be SUNOS4 or IRIX4 */
 178                     /* XXX the test of fhp[5] == 8 could be wrong */
 179                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 180                         (fhp[7] == 0)) {
 181                         /* looks like a length, not a file system typecode */
 182                         fhtype = FHT_IRIX4;
 183                     }
 184                     else {
 185                         /* by elimination */
 186                         fhtype = FHT_SUNOS4;
 187                     }
 188                 }
 189             }
 190         }
 191         else {
 192             /*
 193              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 194              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 195              * could be AIX, HP-UX
 196              */
 197             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 198                 /*
 199                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 200                  * (unless the exported device name is just one letter!),
 201                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 202                  * might be HP-UX (depends on their values for minor devs)
 203                  */
 204                 if ((fhp[6] == 0) && (fhp[7] == 0)) {
 205                     fhtype = FHT_BSD44;
 206                 }
 207                 /*XXX we probably only need to test of these two bytes */
 208                 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
 209                     fhtype = FHT_ULTRIX;
 210                 }
 211                 else {
 212                     /* Could be SUNOS5/IRIX5, maybe AIX */
 213                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 214                     if (fhp[9] == 10)
 215                         fhtype = FHT_SUNOS5;
 216                     /* XXX what about AIX? */
 217                 }
 218             }
 219             else {
 220                 /*
 221                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 222                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 223                  */
 224                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 225                     fhtype = FHT_DECOSF;
 226                 }
 227                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 228                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 229                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 230                         (fhp[5] == 0) && (fhp[4] == 0)) {
 231                         /* XXX is this always true of HP-UX? */
 232                         fhtype = FHT_HPUX9;
 233                     }
 234                     else if (fhp[7] == 2) {
 235                         /* This would be MNT_NFS on AIX, which is impossible */
 236                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 237                     }
 238                     else {
 239                         /*
 240                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 241                          * XXX see any way to disambiguate these, so
 242                          * XXX I'm going with the more likely guess.
 243                          * XXX Sorry, Big Blue.
 244                          */
 245                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 246                     }
 247                 }
 248                 else {
 249                     if (is_UCX(fhp)) {
 250                         fhtype = FHT_VMSUCX;
 251                     }
 252                     else {
 253                         fhtype = FHT_UNKNOWN;
 254                     }
 255                 }
 256             }
 257         }
 258
 259         /* XXX still needs to handle SUNOS3 */
 260
 261         switch (fhtype) {
 262         case FHT_AUSPEX:
 263             fsidp->Fsid_dev.Minor = fhp[7];
 264             fsidp->Fsid_dev.Major = fhp[6];
 265             fsidp->fsid_code = 0;
 266
 267             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 268             *inop = temp;
 269
 270             if (osnamep)
 271                 *osnamep = "Auspex";
 272             break;
 273
 274         case FHT_BSD44:
 275             fsidp->Fsid_dev.Minor = fhp[0];
 276             fsidp->Fsid_dev.Major = fhp[1];
 277             fsidp->fsid_code = 0;
 278
 279             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 280             *inop = temp;
 281
 282             if (osnamep)
 283                 *osnamep = "BSD 4.4";
 284             break;
 285
 286         case FHT_DECOSF:
 287             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 288                         /* XXX could ignore 3 high-order bytes */
 289
 290             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 291             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 292             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 293
 294             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 295             *inop = temp;
 296             if (osnamep)
 297                 *osnamep = "OSF";
 298             break;
 299
 300         case FHT_IRIX4:
 301             fsidp->Fsid_dev.Minor = fhp[3];
 302             fsidp->Fsid_dev.Major = fhp[2];
 303             fsidp->fsid_code = 0;
 304
 305             temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 306             *inop = temp;
 307
 308             if (osnamep)
 309                 *osnamep = "IRIX4";
 310             break;
 311
 312         case FHT_IRIX5:
 313             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 314             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 315             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 316
 317             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 318             *inop = temp;
 319
 320             if (osnamep)
 321                 *osnamep = "IRIX5";
 322             break;
 323
 324 #ifdef notdef
 325         case FHT_SUNOS3:
 326             /*
 327              * XXX - none of the heuristics above return this.
 328              * Are there any SunOS 3.x systems around to care about?
 329              */
 330             if (osnamep)
 331                 *osnamep = "SUNOS3";
 332             break;
 333 #endif
 334
 335         case FHT_SUNOS4:
 336             fsidp->Fsid_dev.Minor = fhp[3];
 337             fsidp->Fsid_dev.Major = fhp[2];
 338             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 339
 340             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 341             *inop = temp;
 342
 343             if (osnamep)
 344                 *osnamep = "SUNOS4";
 345             break;
 346
 347         case FHT_SUNOS5:
 348             temp = make_uint16(fhp[0], fhp[1]);
 349             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 350             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 351             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 352             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 353
 354             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 355             *inop = temp;
 356
 357             if (osnamep)
 358                 *osnamep = "SUNOS5";
 359             break;
 360
 361         case FHT_ULTRIX:
 362             fsidp->fsid_code = 0;
 363             fsidp->Fsid_dev.Minor = fhp[0];
 364             fsidp->Fsid_dev.Major = fhp[1];
 365
 366             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 367             *inop = temp;
 368             if (osnamep)
 369                 *osnamep = "Ultrix";
 370             break;
 371
 372         case FHT_VMSUCX:
 373             /* No numeric file system ID, so hash on the device-name */
 374             if (sizeof(*fsidp) >= 14) {
 375                 if (sizeof(*fsidp) > 14)
 376                     memset((char *)fsidp, 0, sizeof(*fsidp));
 377                 /* just use the whole thing */
 378                 memcpy((char *)fsidp, (char *)fh, 14);
 379             }
 380             else {
 381                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 382
 383                 memset((char *)tempa, 0, sizeof(tempa));
 384                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 385                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 386                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 387                 fsidp->fsid_code = 0;
 388             }
 389
 390             /* VMS file ID is: (RVN, FidHi, FidLo) */
 391             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 392
 393             /* Caller must save (and null-terminate?) this value */
 394             if (fsnamep)
 395                 *fsnamep = (char *)&(fhp[1]);
 396
 397             if (osnamep)
 398                 *osnamep = "VMS";
 399             break;
 400
 401         case FHT_AIX32:
 402             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 403             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 404             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 405
 406             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 407             *inop = temp;
 408
 409             if (osnamep)
 410                 *osnamep = "AIX32";
 411             break;
 412
 413         case FHT_HPUX9:
 414             fsidp->Fsid_dev.Major = fhp[0];
 415             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 416             fsidp->Fsid_dev.Minor = temp;
 417             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 418
 419             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 420             *inop = temp;
 421
 422             if (osnamep)
 423                 *osnamep = "HPUX9";
 424             break;
 425
 426         case FHT_UNKNOWN:
 427 #ifdef DEBUG
 428             /* XXX debugging */
 429             for (i = 0; i < 32; i++)
 430                 (void)fprintf(stderr, "%x.", fhp[i]);
 431             (void)fprintf(stderr, "\n");
 432 #endif
 433             /* Save the actual handle, so it can be display with -u */
 434             for (i = 0; i < 32; i++)
 435                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 436
 437             /* XXX for now, give "bogus" values to aid debugging */
 438             fsidp->fsid_code = 0;
 439             fsidp->Fsid_dev.Minor = 257;
 440             fsidp->Fsid_dev.Major = 257;
 441             *inop = 1;
 442
 443             /* display will show this string instead of (257,257) */
 444             if (fsnamep)
 445                 *fsnamep = "Unknown";
 446
 447             if (osnamep)
 448                 *osnamep = "Unknown";
 449             break;
 450
 451         }
 452 }
 453
 454 /*
 455  * Is this a VMS UCX file handle?
 456  *      Check for:
 457  *      (1) leading code byte   [XXX not yet]
 458  *      (2) followed by string of printing chars & spaces
 459  *      (3) followed by string of nulls
 460  */
 461 static int
 462 is_UCX(fhp)
 463 const unsigned char *fhp;
 464 {
 465         register int i;
 466         int seen_null = 0;
 467
 468         for (i = 1; i < 14; i++) {
 469             if (isprint(fhp[i])) {
 470                 if (seen_null)
 471                    return(0);
 472                 else
 473                    continue;
 474             }
 475             else if (fhp[i] == 0) {
 476                 seen_null = 1;
 477                 continue;
 478             }
 479             else
 480                 return(0);
 481         }
 482
 483         return(1);
 484 }