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)  ((u_int32_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(fh, len, fsidp, inop, osnamep, fsnamep, ourself)
 109 register const unsigned char *fh;
 110 int len _U_;
 111 my_fsid *fsidp;
 112 u_int32_t *inop;
 113 const char **osnamep;           /* if non-NULL, return OS name here */
 114 const char **fsnamep;           /* if non-NULL, return server fs name here (for VMS) */
 115 int ourself;            /* true if file handle was generated on this host */
 116 {
 117         register const unsigned char *fhp = fh;
 118         u_int32_t temp;
 119         int fhtype = FHT_UNKNOWN;
 120         int i;
 121
 122         if (ourself) {
 123             /* File handle generated on this host, no need for guessing */
 124 #if     defined(IRIX40)
 125             fhtype = FHT_IRIX4;
 126 #endif
 127 #if     defined(IRIX50)
 128             fhtype = FHT_IRIX5;
 129 #endif
 130 #if     defined(IRIX51)
 131             fhtype = FHT_IRIX5;
 132 #endif
 133 #if     defined(SUNOS4)
 134             fhtype = FHT_SUNOS4;
 135 #endif
 136 #if     defined(SUNOS5)
 137             fhtype = FHT_SUNOS5;
 138 #endif
 139 #if     defined(ultrix)
 140             fhtype = FHT_ULTRIX;
 141 #endif
 142 #if     defined(__osf__)
 143             fhtype = FHT_DECOSF;
 144 #endif
 145 #if     defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) \
 146      || defined(__OpenBSD__)
 147             fhtype = FHT_BSD44;
 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                 if ((fhp[6] == 0) && (fhp[7] == 0)) {
 200                     fhtype = FHT_BSD44;
 201                 }
 202                 /*XXX we probably only need to test of these two bytes */
 203                 else if ((fhp[21] == 0) && (fhp[23] == 0)) {
 204                     fhtype = FHT_ULTRIX;
 205                 }
 206                 else {
 207                     /* Could be SUNOS5/IRIX5, maybe AIX */
 208                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 209                     if (fhp[9] == 10)
 210                         fhtype = FHT_SUNOS5;
 211                     /* XXX what about AIX? */
 212                 }
 213             }
 214             else {
 215                 /*
 216                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 217                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 218                  */
 219                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 220                     fhtype = FHT_DECOSF;
 221                 }
 222                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 223                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 224                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 225                         (fhp[5] == 0) && (fhp[4] == 0)) {
 226                         /* XXX is this always true of HP-UX? */
 227                         fhtype = FHT_HPUX9;
 228                     }
 229                     else if (fhp[7] == 2) {
 230                         /* This would be MNT_NFS on AIX, which is impossible */
 231                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 232                     }
 233                     else {
 234                         /*
 235                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 236                          * XXX see any way to disambiguate these, so
 237                          * XXX I'm going with the more likely guess.
 238                          * XXX Sorry, Big Blue.
 239                          */
 240                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 241                     }
 242                 }
 243                 else {
 244                     if (is_UCX(fhp)) {
 245                         fhtype = FHT_VMSUCX;
 246                     }
 247                     else {
 248                         fhtype = FHT_UNKNOWN;
 249                     }
 250                 }
 251             }
 252         }
 253
 254         /* XXX still needs to handle SUNOS3 */
 255
 256         switch (fhtype) {
 257         case FHT_AUSPEX:
 258             fsidp->Fsid_dev.Minor = fhp[7];
 259             fsidp->Fsid_dev.Major = fhp[6];
 260             fsidp->fsid_code = 0;
 261
 262             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 263
 264             if (osnamep)
 265                 *osnamep = "Auspex";
 266             break;
 267
 268         case FHT_BSD44:
 269             fsidp->Fsid_dev.Minor = fhp[0];
 270             fsidp->Fsid_dev.Major = fhp[1];
 271             fsidp->fsid_code = 0;
 272
 273             *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 274
 275             if (osnamep)
 276                 *osnamep = "BSD 4.4";
 277             break;
 278
 279         case FHT_DECOSF:
 280             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 281                         /* XXX could ignore 3 high-order bytes */
 282
 283             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 284             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 285             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 286
 287             *inop = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 288             if (osnamep)
 289                 *osnamep = "OSF";
 290             break;
 291
 292         case FHT_IRIX4:
 293             fsidp->Fsid_dev.Minor = fhp[3];
 294             fsidp->Fsid_dev.Major = fhp[2];
 295             fsidp->fsid_code = 0;
 296
 297             *inop = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 298
 299             if (osnamep)
 300                 *osnamep = "IRIX4";
 301             break;
 302
 303         case FHT_IRIX5:
 304             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 305             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 306             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 307
 308             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 309
 310             if (osnamep)
 311                 *osnamep = "IRIX5";
 312             break;
 313
 314 #ifdef notdef
 315         case FHT_SUNOS3:
 316             /*
 317              * XXX - none of the heuristics above return this.
 318              * Are there any SunOS 3.x systems around to care about?
 319              */
 320             if (osnamep)
 321                 *osnamep = "SUNOS3";
 322             break;
 323 #endif
 324
 325         case FHT_SUNOS4:
 326             fsidp->Fsid_dev.Minor = fhp[3];
 327             fsidp->Fsid_dev.Major = fhp[2];
 328             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 329
 330             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 331
 332             if (osnamep)
 333                 *osnamep = "SUNOS4";
 334             break;
 335
 336         case FHT_SUNOS5:
 337             temp = make_uint16(fhp[0], fhp[1]);
 338             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 339             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 340             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 341             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 342
 343             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 344
 345             if (osnamep)
 346                 *osnamep = "SUNOS5";
 347             break;
 348
 349         case FHT_ULTRIX:
 350             fsidp->fsid_code = 0;
 351             fsidp->Fsid_dev.Minor = fhp[0];
 352             fsidp->Fsid_dev.Major = fhp[1];
 353
 354             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 355             *inop = temp;
 356             if (osnamep)
 357                 *osnamep = "Ultrix";
 358             break;
 359
 360         case FHT_VMSUCX:
 361             /* No numeric file system ID, so hash on the device-name */
 362             if (sizeof(*fsidp) >= 14) {
 363                 if (sizeof(*fsidp) > 14)
 364                     memset((char *)fsidp, 0, sizeof(*fsidp));
 365                 /* just use the whole thing */
 366                 memcpy((char *)fsidp, (char *)fh, 14);
 367             }
 368             else {
 369                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 370
 371                 memset((char *)tempa, 0, sizeof(tempa));
 372                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 373                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 374                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 375                 fsidp->fsid_code = 0;
 376             }
 377
 378             /* VMS file ID is: (RVN, FidHi, FidLo) */
 379             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 380
 381             /* Caller must save (and null-terminate?) this value */
 382             if (fsnamep)
 383                 *fsnamep = (char *)&(fhp[1]);
 384
 385             if (osnamep)
 386                 *osnamep = "VMS";
 387             break;
 388
 389         case FHT_AIX32:
 390             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 391             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 392             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 393
 394             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 395
 396             if (osnamep)
 397                 *osnamep = "AIX32";
 398             break;
 399
 400         case FHT_HPUX9:
 401             fsidp->Fsid_dev.Major = fhp[0];
 402             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 403             fsidp->Fsid_dev.Minor = temp;
 404             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 405
 406             *inop = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 407
 408             if (osnamep)
 409                 *osnamep = "HPUX9";
 410             break;
 411
 412         case FHT_UNKNOWN:
 413 #ifdef DEBUG
 414             /* XXX debugging */
 415             for (i = 0; i < 32; i++)
 416                 (void)fprintf(stderr, "%x.", fhp[i]);
 417             (void)fprintf(stderr, "\n");
 418 #endif
 419             /* Save the actual handle, so it can be display with -u */
 420             for (i = 0; i < 32; i++)
 421                 (void)snprintf(&(fsidp->Opaque_Handle[i*2]), 3, "%.2X", fhp[i]);
 422
 423             /* XXX for now, give "bogus" values to aid debugging */
 424             fsidp->fsid_code = 0;
 425             fsidp->Fsid_dev.Minor = 257;
 426             fsidp->Fsid_dev.Major = 257;
 427             *inop = 1;
 428
 429             /* display will show this string instead of (257,257) */
 430             if (fsnamep)
 431                 *fsnamep = "Unknown";
 432
 433             if (osnamep)
 434                 *osnamep = "Unknown";
 435             break;
 436
 437         }
 438 }
 439
 440 /*
 441  * Is this a VMS UCX file handle?
 442  *      Check for:
 443  *      (1) leading code byte   [XXX not yet]
 444  *      (2) followed by string of printing chars & spaces
 445  *      (3) followed by string of nulls
 446  */
 447 static int
 448 is_UCX(fhp)
 449 const unsigned char *fhp;
 450 {
 451         register int i;
 452         int seen_null = 0;
 453
 454         for (i = 1; i < 14; i++) {
 455             if (isprint(fhp[i])) {
 456                 if (seen_null)
 457                    return(0);
 458                 else
 459                    continue;
 460             }
 461             else if (fhp[i] == 0) {
 462                 seen_null = 1;
 463                 continue;
 464             }
 465             else
 466                 return(0);
 467         }
 468
 469         return(1);
 470 }