contrib/tcpdump-3.8.3/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 1.25.2.2 2003/11/16 08:51:07 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
  83 #ifdef  ultrix
  84 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  85 #define XFF(x)  ((u_int32_t)(x))
  86 #else
  87 #define XFF(x)  (x)
  88 #endif
  89
  90 #define make_uint32(msb,b,c,lsb)\
  91         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
  92
  93 #define make_uint24(msb,b, lsb)\
  94         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
  95
  96 #define make_uint16(msb,lsb)\
  97         (XFF(lsb) + (XFF(msb)<<8))
  98
  99 #ifdef  __alpha
 100         /* or other 64-bit systems */
 101 #define make_uint48(msb,b,c,d,e,lsb)\
 102         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
 103 #else
 104         /* on 32-bit systems ignore high-order bits */
 105 #define make_uint48(msb,b,c,d,e,lsb)\
 106         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
 107 #endif
 108
 109 static int is_UCX(const unsigned char *);
 110
 111 void
 112 Parse_fh(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
 113 register const unsigned char *fh;
 114 int len;
 115 my_fsid *fsidp;
 116 ino_t *inop;
 117 const char **osnamep;           /* if non-NULL, return OS name here */
 118 const char **fsnamep;           /* if non-NULL, return server fs name here (for VMS) */
 119 int ourself;            /* true if file handle was generated on this host */
 120 {
 121         register const unsigned char *fhp = fh;
 122         u_int32_t temp;
 123         int fhtype = FHT_UNKNOWN;
 124         int i;
 125
 126         if (ourself) {
 127             /* File handle generated on this host, no need for guessing */
 128 #if     defined(IRIX40)
 129             fhtype = FHT_IRIX4;
 130 #endif
 131 #if     defined(IRIX50)
 132             fhtype = FHT_IRIX5;
 133 #endif
 134 #if     defined(IRIX51)
 135             fhtype = FHT_IRIX5;
 136 #endif
 137 #if     defined(SUNOS4)
 138             fhtype = FHT_SUNOS4;
 139 #endif
 140 #if     defined(SUNOS5)
 141             fhtype = FHT_SUNOS5;
 142 #endif
 143 #if     defined(ultrix)
 144             fhtype = FHT_ULTRIX;
 145 #endif
 146 #if     defined(__osf__)
 147             fhtype = FHT_DECOSF;
 148 #endif
 149         }
 150         /*
 151          * This is basically a big decision tree
 152          */
 153         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 154             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 155             /* probably rules out HP-UX, AIX unless they allow major=0 */
 156             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 157                 /* bytes[2,3] == (0,0); must be Auspex */
 158                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 159                 fhtype = FHT_AUSPEX;
 160             }
 161             else {
 162                 /*
 163                  * bytes[2,3] != (0,0); rules out Auspex, could be
 164                  * DECOSF, SUNOS4, or IRIX4
 165                  */
 166                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 167                         (fhp[8] == 12) && (fhp[9] == 0)) {
 168                     /* seems to be DECOSF, with minor == 0 */
 169                     fhtype = FHT_DECOSF;
 170                 }
 171                 else {
 172                     /* could be SUNOS4 or IRIX4 */
 173                     /* XXX the test of fhp[5] == 8 could be wrong */
 174                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 175                         (fhp[7] == 0)) {
 176                         /* looks like a length, not a file system typecode */
 177                         fhtype = FHT_IRIX4;
 178                     }
 179                     else {
 180                         /* by elimination */
 181                         fhtype = FHT_SUNOS4;
 182                     }
 183                 }
 184             }
 185         }
 186         else {
 187             /*
 188              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 189              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 190              * could be AIX, HP-UX
 191              */
 192             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 193                 /*
 194                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 195                  * (unless the exported device name is just one letter!),
 196                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 197                  * might be HP-UX (depends on their values for minor devs)
 198                  */
 199                 /*XXX we probably only need to test of these two bytes */
 200                 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             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 260             *inop = temp;
 261
 262             if (osnamep)
 263                 *osnamep = "Auspex";
 264             break;
 265
 266         case FHT_DECOSF:
 267             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 268                         /* XXX could ignore 3 high-order bytes */
 269
 270             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 271             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 272             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 273
 274             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 275             *inop = temp;
 276             if (osnamep)
 277                 *osnamep = "OSF";
 278             break;
 279
 280         case FHT_IRIX4:
 281             fsidp->Fsid_dev.Minor = fhp[3];
 282             fsidp->Fsid_dev.Major = fhp[2];
 283             fsidp->fsid_code = 0;
 284
 285             temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 286             *inop = temp;
 287
 288             if (osnamep)
 289                 *osnamep = "IRIX4";
 290             break;
 291
 292         case FHT_IRIX5:
 293             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 294             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 295             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 296
 297             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 298             *inop = temp;
 299
 300             if (osnamep)
 301                 *osnamep = "IRIX5";
 302             break;
 303
 304         case FHT_SUNOS3:
 305             if (osnamep)
 306                 *osnamep = "SUNOS3";
 307             break;
 308
 309         case FHT_SUNOS4:
 310             fsidp->Fsid_dev.Minor = fhp[3];
 311             fsidp->Fsid_dev.Major = fhp[2];
 312             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 313
 314             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 315             *inop = temp;
 316
 317             if (osnamep)
 318                 *osnamep = "SUNOS4";
 319             break;
 320
 321         case FHT_SUNOS5:
 322             temp = make_uint16(fhp[0], fhp[1]);
 323             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 324             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 325             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 326             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 327
 328             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 329             *inop = temp;
 330
 331             if (osnamep)
 332                 *osnamep = "SUNOS5";
 333             break;
 334
 335         case FHT_ULTRIX:
 336             fsidp->fsid_code = 0;
 337             fsidp->Fsid_dev.Minor = fhp[0];
 338             fsidp->Fsid_dev.Major = fhp[1];
 339
 340             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 341             *inop = temp;
 342             if (osnamep)
 343                 *osnamep = "Ultrix";
 344             break;
 345
 346         case FHT_VMSUCX:
 347             /* No numeric file system ID, so hash on the device-name */
 348             if (sizeof(*fsidp) >= 14) {
 349                 if (sizeof(*fsidp) > 14)
 350                     memset((char *)fsidp, 0, sizeof(*fsidp));
 351                 /* just use the whole thing */
 352                 memcpy((char *)fsidp, (char *)fh, 14);
 353             }
 354             else {
 355                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 356
 357                 memset((char *)tempa, 0, sizeof(tempa));
 358                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 359                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 360                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 361                 fsidp->fsid_code = 0;
 362             }
 363
 364             /* VMS file ID is: (RVN, FidHi, FidLo) */
 365             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 366
 367             /* Caller must save (and null-terminate?) this value */
 368             if (fsnamep)
 369                 *fsnamep = (char *)&(fhp[1]);
 370
 371             if (osnamep)
 372                 *osnamep = "VMS";
 373             break;
 374
 375         case FHT_AIX32:
 376             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 377             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 378             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 379
 380             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 381             *inop = temp;
 382
 383             if (osnamep)
 384                 *osnamep = "AIX32";
 385             break;
 386
 387         case FHT_HPUX9:
 388             fsidp->Fsid_dev.Major = fhp[0];
 389             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 390             fsidp->Fsid_dev.Minor = temp;
 391             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 392
 393             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 394             *inop = temp;
 395
 396             if (osnamep)
 397                 *osnamep = "HPUX9";
 398             break;
 399
 400         case FHT_UNKNOWN:
 401 #ifdef DEBUG
 402             /* XXX debugging */
 403             for (i = 0; i < 32; i++)
 404                 (void)fprintf(stderr, "%x.", fhp[i]);
 405             (void)fprintf(stderr, "\n");
 406 #endif
 407             /* Save the actual handle, so it can be display with -u */
 408             for (i = 0; i < 32; i++)
 409                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 410
 411             /* XXX for now, give "bogus" values to aid debugging */
 412             fsidp->fsid_code = 0;
 413             fsidp->Fsid_dev.Minor = 257;
 414             fsidp->Fsid_dev.Major = 257;
 415             *inop = 1;
 416
 417             /* display will show this string instead of (257,257) */
 418             if (fsnamep)
 419                 *fsnamep = "Unknown";
 420
 421             if (osnamep)
 422                 *osnamep = "Unknown";
 423             break;
 424
 425         }
 426 }
 427
 428 /*
 429  * Is this a VMS UCX file handle?
 430  *      Check for:
 431  *      (1) leading code byte   [XXX not yet]
 432  *      (2) followed by string of printing chars & spaces
 433  *      (3) followed by string of nulls
 434  */
 435 static int
 436 is_UCX(fhp)
 437 const unsigned char *fhp;
 438 {
 439         register int i;
 440         int seen_null = 0;
 441
 442         for (i = 1; i < 14; i++) {
 443             if (isprint(fhp[i])) {
 444                 if (seen_null)
 445                    return(0);
 446                 else
 447                    continue;
 448             }
 449             else if (fhp[i] == 0) {
 450                 seen_null = 1;
 451                 continue;
 452             }
 453             else
 454                 return(0);
 455         }
 456
 457         return(1);
 458 }