The Tcpdump Group git mirrors - tcpdump/blob - parsenfsfh.c

   1 /*
   2  * parsenfsfh.c - portable parser for NFS file handles
   3  *                      uses all sorts of heuristics
   4  *
   5  * Jeffrey C. Mogul
   6  * Digital Equipment Corporation
   7  * Western Research Laboratory
   8  */
   9
  10 #ifndef lint
  11 static const char rcsid[] =
  12     "@(#) $Header: /tcpdump/master/tcpdump/parsenfsfh.c,v 1.14 1999-10-07 23:47:11 mcr Exp $ (LBL)";
  13 #endif
  14
  15 #include <sys/types.h>
  16 #include <sys/time.h>
  17
  18 #include <ctype.h>
  19 #ifdef HAVE_MEMORY_H
  20 #include <memory.h>
  21 #endif
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "interface.h"
  26 #include "nfsfh.h"
  27
  28 /*
  29  * This routine attempts to parse a file handle (in network byte order),
  30  * using heuristics to guess what kind of format it is in.  See the
  31  * file "fhandle_layouts" for a detailed description of the various
  32  * patterns we know about.
  33  *
  34  * The file handle is parsed into our internal representation of a
  35  * file-system id, and an internal representation of an inode-number.
  36  */
  37
  38 #define FHT_UNKNOWN     0
  39 #define FHT_AUSPEX      1
  40 #define FHT_DECOSF      2
  41 #define FHT_IRIX4       3
  42 #define FHT_IRIX5       4
  43 #define FHT_SUNOS3      5
  44 #define FHT_SUNOS4      6
  45 #define FHT_ULTRIX      7
  46 #define FHT_VMSUCX      8
  47 #define FHT_SUNOS5      9
  48 #define FHT_AIX32       10
  49 #define FHT_HPUX9       11
  50
  51 #ifdef  ultrix
  52 /* Nasty hack to keep the Ultrix C compiler from emitting bogus warnings */
  53 #define XFF(x)  ((u_int32_t)(x))
  54 #else
  55 #define XFF(x)  (x)
  56 #endif
  57
  58 #define make_uint32(msb,b,c,lsb)\
  59         (XFF(lsb) + (XFF(c)<<8) + (XFF(b)<<16) + (XFF(msb)<<24))
  60
  61 #define make_uint24(msb,b, lsb)\
  62         (XFF(lsb) + (XFF(b)<<8) + (XFF(msb)<<16))
  63
  64 #define make_uint16(msb,lsb)\
  65         (XFF(lsb) + (XFF(msb)<<8))
  66
  67 #ifdef  __alpha
  68         /* or other 64-bit systems */
  69 #define make_uint48(msb,b,c,d,e,lsb)\
  70         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24) + ((b)<<32) + ((msb)<<40))
  71 #else
  72         /* on 32-bit systems ignore high-order bits */
  73 #define make_uint48(msb,b,c,d,e,lsb)\
  74         ((lsb) + ((e)<<8) + ((d)<<16) + ((c)<<24))
  75 #endif
  76
  77 static int is_UCX(unsigned char *);
  78
  79 void
  80 Parse_fh(fh, fsidp, inop, osnamep, fsnamep, ourself)
  81 register caddr_t *fh;
  82 my_fsid *fsidp;
  83 ino_t *inop;
  84 char **osnamep;         /* if non-NULL, return OS name here */
  85 char **fsnamep;         /* if non-NULL, return server fs name here (for VMS) */
  86 int ourself;            /* true if file handle was generated on this host */
  87 {
  88         register unsigned char *fhp = (unsigned char *)fh;
  89         u_int32_t temp;
  90         int fhtype = FHT_UNKNOWN;
  91
  92         if (ourself) {
  93             /* File handle generated on this host, no need for guessing */
  94 #if     defined(IRIX40)
  95             fhtype = FHT_IRIX4;
  96 #endif
  97 #if     defined(IRIX50)
  98             fhtype = FHT_IRIX5;
  99 #endif
 100 #if     defined(IRIX51)
 101             fhtype = FHT_IRIX5;
 102 #endif
 103 #if     defined(SUNOS4)
 104             fhtype = FHT_SUNOS4;
 105 #endif
 106 #if     defined(SUNOS5)
 107             fhtype = FHT_SUNOS5;
 108 #endif
 109 #if     defined(ultrix)
 110             fhtype = FHT_ULTRIX;
 111 #endif
 112 #if     defined(__osf__)
 113             fhtype = FHT_DECOSF;
 114 #endif
 115         }
 116         /*
 117          * This is basically a big decision tree
 118          */
 119         else if ((fhp[0] == 0) && (fhp[1] == 0)) {
 120             /* bytes[0,1] == (0,0); rules out Ultrix, IRIX5, SUNOS5 */
 121             /* probably rules out HP-UX, AIX unless they allow major=0 */
 122             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 123                 /* bytes[2,3] == (0,0); must be Auspex */
 124                 /* XXX or could be Ultrix+MASSBUS "hp" disk? */
 125                 fhtype = FHT_AUSPEX;
 126             }
 127             else {
 128                 /*
 129                  * bytes[2,3] != (0,0); rules out Auspex, could be
 130                  * DECOSF, SUNOS4, or IRIX4
 131                  */
 132                 if ((fhp[4] != 0) && (fhp[5] == 0) &&
 133                         (fhp[8] == 12) && (fhp[9] == 0)) {
 134                     /* seems to be DECOSF, with minor == 0 */
 135                     fhtype = FHT_DECOSF;
 136                 }
 137                 else {
 138                     /* could be SUNOS4 or IRIX4 */
 139                     /* XXX the test of fhp[5] == 8 could be wrong */
 140                     if ((fhp[4] == 0) && (fhp[5] == 8) && (fhp[6] == 0) &&
 141                         (fhp[7] == 0)) {
 142                         /* looks like a length, not a file system typecode */
 143                         fhtype = FHT_IRIX4;
 144                     }
 145                     else {
 146                         /* by elimination */
 147                         fhtype = FHT_SUNOS4;
 148                     }
 149                 }
 150             }
 151         }
 152         else {
 153             /*
 154              * bytes[0,1] != (0,0); rules out Auspex, IRIX4, SUNOS4
 155              * could be IRIX5, DECOSF, UCX, Ultrix, SUNOS5
 156              * could be AIX, HP-UX
 157              */
 158             if ((fhp[2] == 0) && (fhp[3] == 0)) {
 159                 /*
 160                  * bytes[2,3] == (0,0); rules out OSF, probably not UCX
 161                  * (unless the exported device name is just one letter!),
 162                  * could be Ultrix, IRIX5, AIX, or SUNOS5
 163                  * might be HP-UX (depends on their values for minor devs)
 164                  */
 165                 /*XXX we probably only need to test of these two bytes */
 166                 if ((fhp[21] == 0) && (fhp[23] == 0)) {
 167                     fhtype = FHT_ULTRIX;
 168                 }
 169                 else {
 170                     /* Could be SUNOS5/IRIX5, maybe AIX */
 171                     /* XXX no obvious difference between SUNOS5 and IRIX5 */
 172                     if (fhp[9] == 10)
 173                         fhtype = FHT_SUNOS5;
 174                     /* XXX what about AIX? */
 175                 }
 176             }
 177             else {
 178                 /*
 179                  * bytes[2,3] != (0,0); rules out Ultrix, could be
 180                  * DECOSF, SUNOS5, IRIX5, AIX, HP-UX, or UCX
 181                  */
 182                 if ((fhp[8] == 12) && (fhp[9] == 0)) {
 183                     fhtype = FHT_DECOSF;
 184                 }
 185                 else if ((fhp[8] == 0) && (fhp[9] == 10)) {
 186                     /* could be SUNOS5/IRIX5, AIX, HP-UX */
 187                     if ((fhp[7] == 0) && (fhp[6] == 0) &&
 188                         (fhp[5] == 0) && (fhp[4] == 0)) {
 189                         /* XXX is this always true of HP-UX? */
 190                         fhtype = FHT_HPUX9;
 191                     }
 192                     else if (fhp[7] == 2) {
 193                         /* This would be MNT_NFS on AIX, which is impossible */
 194                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 195                     }
 196                     else {
 197                         /*
 198                          * XXX Could be SUNOS5/IRIX5 or AIX.  I don't
 199                          * XXX see any way to disambiguate these, so
 200                          * XXX I'm going with the more likely guess.
 201                          * XXX Sorry, Big Blue.
 202                          */
 203                         fhtype = FHT_SUNOS5;    /* or maybe IRIX5 */
 204                     }
 205                 }
 206                 else {
 207                     if (is_UCX(fhp)) {
 208                         fhtype = FHT_VMSUCX;
 209                     }
 210                     else {
 211                         fhtype = FHT_UNKNOWN;
 212                     }
 213                 }
 214             }
 215         }
 216
 217         /* XXX still needs to handle SUNOS3 */
 218
 219         switch (fhtype) {
 220         case FHT_AUSPEX:
 221             fsidp->Fsid_dev.Minor = fhp[7];
 222             fsidp->Fsid_dev.Major = fhp[6];
 223             fsidp->fsid_code = 0;
 224
 225             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 226             *inop = temp;
 227
 228             if (osnamep)
 229                 *osnamep = "Auspex";
 230             break;
 231
 232         case FHT_DECOSF:
 233             fsidp->fsid_code = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 234                         /* XXX could ignore 3 high-order bytes */
 235
 236             temp = make_uint32(fhp[3], fhp[2], fhp[1], fhp[0]);
 237             fsidp->Fsid_dev.Minor = temp & 0xFFFFF;
 238             fsidp->Fsid_dev.Major = (temp>>20) & 0xFFF;
 239
 240             temp = make_uint32(fhp[15], fhp[14], fhp[13], fhp[12]);
 241             *inop = temp;
 242             if (osnamep)
 243                 *osnamep = "OSF";
 244             break;
 245
 246         case FHT_IRIX4:
 247             fsidp->Fsid_dev.Minor = fhp[3];
 248             fsidp->Fsid_dev.Major = fhp[2];
 249             fsidp->fsid_code = 0;
 250
 251             temp = make_uint32(fhp[8], fhp[9], fhp[10], fhp[11]);
 252             *inop = temp;
 253
 254             if (osnamep)
 255                 *osnamep = "IRIX4";
 256             break;
 257
 258         case FHT_IRIX5:
 259             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 260             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 261             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 262
 263             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 264             *inop = temp;
 265
 266             if (osnamep)
 267                 *osnamep = "IRIX5";
 268             break;
 269
 270         case FHT_SUNOS3:
 271             if (osnamep)
 272                 *osnamep = "SUNOS3";
 273             break;
 274
 275         case FHT_SUNOS4:
 276             fsidp->Fsid_dev.Minor = fhp[3];
 277             fsidp->Fsid_dev.Major = fhp[2];
 278             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 279
 280             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 281             *inop = temp;
 282
 283             if (osnamep)
 284                 *osnamep = "SUNOS4";
 285             break;
 286
 287         case FHT_SUNOS5:
 288             temp = make_uint16(fhp[0], fhp[1]);
 289             fsidp->Fsid_dev.Major = (temp>>2) &  0x3FFF;
 290             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 291             fsidp->Fsid_dev.Minor = temp & 0x3FFFF;
 292             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 293
 294             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 295             *inop = temp;
 296
 297             if (osnamep)
 298                 *osnamep = "SUNOS5";
 299             break;
 300
 301         case FHT_ULTRIX:
 302             fsidp->fsid_code = 0;
 303             fsidp->Fsid_dev.Minor = fhp[0];
 304             fsidp->Fsid_dev.Major = fhp[1];
 305
 306             temp = make_uint32(fhp[7], fhp[6], fhp[5], fhp[4]);
 307             *inop = temp;
 308             if (osnamep)
 309                 *osnamep = "Ultrix";
 310             break;
 311
 312         case FHT_VMSUCX:
 313             /* No numeric file system ID, so hash on the device-name */
 314             if (sizeof(*fsidp) >= 14) {
 315                 if (sizeof(*fsidp) > 14)
 316                     memset((char *)fsidp, 0, sizeof(*fsidp));
 317                 /* just use the whole thing */
 318                 memcpy((char *)fsidp, (char *)fh, 14);
 319             }
 320             else {
 321                 u_int32_t tempa[4];     /* at least 16 bytes, maybe more */
 322
 323                 memset((char *)tempa, 0, sizeof(tempa));
 324                 memcpy((char *)tempa, (char *)fh, 14); /* ensure alignment */
 325                 fsidp->Fsid_dev.Minor = tempa[0] + (tempa[1]<<1);
 326                 fsidp->Fsid_dev.Major = tempa[2] + (tempa[3]<<1);
 327                 fsidp->fsid_code = 0;
 328             }
 329
 330             /* VMS file ID is: (RVN, FidHi, FidLo) */
 331             *inop = make_uint32(fhp[26], fhp[27], fhp[23], fhp[22]);
 332
 333             /* Caller must save (and null-terminate?) this value */
 334             if (fsnamep)
 335                 *fsnamep = (char *)&(fhp[1]);
 336
 337             if (osnamep)
 338                 *osnamep = "VMS";
 339             break;
 340
 341         case FHT_AIX32:
 342             fsidp->Fsid_dev.Minor = make_uint16(fhp[2], fhp[3]);
 343             fsidp->Fsid_dev.Major = make_uint16(fhp[0], fhp[1]);
 344             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 345
 346             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 347             *inop = temp;
 348
 349             if (osnamep)
 350                 *osnamep = "AIX32";
 351             break;
 352
 353         case FHT_HPUX9:
 354             fsidp->Fsid_dev.Major = fhp[0];
 355             temp = make_uint24(fhp[1], fhp[2], fhp[3]);
 356             fsidp->Fsid_dev.Minor = temp;
 357             fsidp->fsid_code = make_uint32(fhp[4], fhp[5], fhp[6], fhp[7]);
 358
 359             temp = make_uint32(fhp[12], fhp[13], fhp[14], fhp[15]);
 360             *inop = temp;
 361
 362             if (osnamep)
 363                 *osnamep = "HPUX9";
 364             break;
 365
 366         case FHT_UNKNOWN:
 367 #ifdef DEBUG
 368             {
 369                 /* XXX debugging */
 370                 int i;
 371                 for (i = 0; i < 32; i++)
 372                         (void)fprintf(stderr, "%x.", fhp[i]);
 373                 (void)fprintf(stderr, "\n");
 374             }
 375 #endif
 376             /* XXX for now, give "bogus" values to aid debugging */
 377             fsidp->fsid_code = 0;
 378             fsidp->Fsid_dev.Minor = 257;
 379             fsidp->Fsid_dev.Major = 257;
 380             *inop = 1;
 381
 382             /* display will show this string instead of (257,257) */
 383             if (fsnamep)
 384                 *fsnamep = "Unknown";
 385
 386             if (osnamep)
 387                 *osnamep = "Unknown";
 388             break;
 389
 390         }
 391 }
 392
 393 /*
 394  * Is this a VMS UCX file handle?
 395  *      Check for:
 396  *      (1) leading code byte   [XXX not yet]
 397  *      (2) followed by string of printing chars & spaces
 398  *      (3) followed by string of nulls
 399  */
 400 static int
 401 is_UCX(fhp)
 402 unsigned char *fhp;
 403 {
 404         register int i;
 405         int seen_null = 0;
 406
 407         for (i = 1; i < 14; i++) {
 408             if (isprint(fhp[i])) {
 409                 if (seen_null)
 410                    return(0);
 411                 else
 412                    continue;
 413             }
 414             else if (fhp[i] == 0) {
 415                 seen_null = 1;
 416                 continue;
 417             }
 418             else
 419                 return(0);
 420         }
 421
 422         return(1);
 423 }