utils/exportfs/exportfs.c

   1 /*
   2  * utils/exportfs/exportfs.c
   3  *
   4  * Export file systems to knfsd
   5  *
   6  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   7  *
   8  * Extensive changes, 1999, Neil Brown <neilb@cse.unsw.edu.au>
   9  */
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #include <sys/vfs.h>
  16 #include <unistd.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <stdarg.h>
  20 #include <getopt.h>
  21 #include <netdb.h>
  22 #include <errno.h>
  23 #include "xmalloc.h"
  24 #include "misc.h"
  25 #include "nfslib.h"
  26 #include "exportfs.h"
  27 #include "xmalloc.h"
  28 #include "xlog.h"
  29
  30 static void     export_all(int verbose);
  31 static void     exportfs(char *arg, char *options, int verbose);
  32 static void     unexportfs(char *arg, int verbose);
  33 static void     exports_update(int verbose);
  34 static void     dump(int verbose);
  35 static void     error(nfs_export *exp, int err);
  36 static void     usage(void);
  37 static void     validate_export(nfs_export *exp);
  38
  39 int
  40 main(int argc, char **argv)
  41 {
  42         char    *options = NULL;
  43         int     f_export = 1;
  44         int     f_all = 0;
  45         int     f_verbose = 0;
  46         int     f_reexport = 0;
  47         int     f_ignore = 0;
  48         int     i, c;
  49         int     new_cache = 0;
  50         int     force_flush = 0;
  51
  52         xlog_open("exportfs");
  53
  54         export_errno = 0;
  55
  56         while ((c = getopt(argc, argv, "aio:ruvf")) != EOF) {
  57                 switch(c) {
  58                 case 'a':
  59                         f_all = 1;
  60                         break;
  61                 case 'i':
  62                         f_ignore = 1;
  63                         break;
  64                 case 'o':
  65                         options = optarg;
  66                         break;
  67                 case 'r':
  68                         f_reexport = 1;
  69                         f_all = 1;
  70                         break;
  71                 case 'u':
  72                         f_export = 0;
  73                         break;
  74                 case 'v':
  75                         f_verbose = 1;
  76                         break;
  77                 case 'f':
  78                         force_flush = 1;
  79                         break;
  80                 default:
  81                         usage();
  82                         break;
  83                 }
  84         }
  85
  86         if (optind != argc && f_all) {
  87                 fprintf(stderr,"exportfs: extra arguments are not permitted with -a or -r.\n");
  88                 return 1;
  89         }
  90         if (f_ignore && (f_all || ! f_export)) {
  91                 fprintf(stderr,"exportfs: -i not meaningful with -a, -r or -u.\n");
  92                 return 1;
  93         }
  94         if (f_reexport && ! f_export) {
  95                 fprintf(stderr, "exportfs: -r and -u are incompatible.\n");
  96                 return 1;
  97         }
  98         new_cache = check_new_cache();
  99         if (optind == argc && ! f_all) {
 100                 if (force_flush) {
 101                         if (new_cache)
 102                                 cache_flush(1);
 103                         else {
 104                                 fprintf(stderr, "exportfs: -f: only available with new cache controls: mount /proc/fs/nfsd first\n");
 105                                 exit(1);
 106                         }
 107                         return 0;
 108                 } else {
 109                         xtab_export_read();
 110                         dump(f_verbose);
 111                         return 0;
 112                 }
 113         }
 114
 115         if (f_export && ! f_ignore)
 116                 export_read(_PATH_EXPORTS);
 117         if (f_export) {
 118                 if (f_all)
 119                         export_all(f_verbose);
 120                 else
 121                         for (i = optind; i < argc ; i++)
 122                                 exportfs(argv[i], options, f_verbose);
 123         }
 124         /* If we are unexporting everything, then
 125          * don't care about what should be exported, as that
 126          * may require DNS lookups..
 127          */
 128         if (! ( !f_export && f_all)) {
 129                 /* note: xtab_*_read does not update entries if they already exist,
 130                  * so this will not lose new options
 131                  */
 132                 if (!f_reexport)
 133                         xtab_export_read();
 134                 if (!f_export)
 135                         for (i = optind ; i < argc ; i++)
 136                                 unexportfs(argv[i], f_verbose);
 137                 if (!new_cache)
 138                         rmtab_read();
 139         }
 140         if (!new_cache) {
 141                 xtab_mount_read();
 142                 exports_update(f_verbose);
 143         }
 144         xtab_export_write();
 145         if (new_cache)
 146                 cache_flush(force_flush);
 147         if (!new_cache)
 148                 xtab_mount_write();
 149
 150         return export_errno;
 151 }
 152
 153 static void
 154 exports_update_one(nfs_export *exp, int verbose)
 155 {
 156                 /* check mountpoint option */
 157         if (exp->m_mayexport &&
 158             exp->m_export.e_mountpoint &&
 159             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 160                            exp->m_export.e_mountpoint:
 161                            exp->m_export.e_path)) {
 162                 printf("%s not exported as %s not a mountpoint.\n",
 163                        exp->m_export.e_path, exp->m_export.e_mountpoint);
 164                 exp->m_mayexport = 0;
 165         }
 166         if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 167                 if (verbose)
 168                         printf("%sexporting %s:%s to kernel\n",
 169                                exp->m_exported ?"re":"",
 170                                exp->m_client->m_hostname,
 171                                exp->m_export.e_path);
 172                 if (!export_export(exp))
 173                         error(exp, errno);
 174         }
 175         if (exp->m_exported && ! exp->m_mayexport) {
 176                 if (verbose)
 177                         printf("unexporting %s:%s from kernel\n",
 178                                exp->m_client->m_hostname,
 179                                exp->m_export.e_path);
 180                 if (!export_unexport(exp))
 181                         error(exp, errno);
 182         }
 183 }
 184
 185
 186 /* we synchronise intention with reality.
 187  * entries with m_mayexport get exported
 188  * entries with m_exported but not m_mayexport get unexported
 189  * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
 190  */
 191 static void
 192 exports_update(int verbose)
 193 {
 194         nfs_export      *exp;
 195
 196         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 197                 exports_update_one(exp, verbose);
 198         }
 199         for (exp = exportlist[MCL_GSS]; exp; exp=exp->m_next) {
 200                 exports_update_one(exp, verbose);
 201         }
 202 }
 203
 204 /*
 205  * export_all finds all entries and
 206  *    marks them xtabent and mayexport so that they get exported
 207  */
 208 static void
 209 export_all(int verbose)
 210 {
 211         nfs_export      *exp;
 212         int             i;
 213
 214         for (i = 0; i < MCL_MAXTYPES; i++) {
 215                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 216                         if (verbose)
 217                                 printf("exporting %s:%s\n",
 218                                        exp->m_client->m_hostname,
 219                                        exp->m_export.e_path);
 220                         exp->m_xtabent = 1;
 221                         exp->m_mayexport = 1;
 222                         exp->m_changed = 1;
 223                         exp->m_warned = 0;
 224                         validate_export(exp);
 225                 }
 226         }
 227 }
 228
 229
 230 static void
 231 exportfs(char *arg, char *options, int verbose)
 232 {
 233         struct exportent *eep;
 234         nfs_export      *exp;
 235         struct hostent  *hp = NULL;
 236         char            *path;
 237         char            *hname = arg;
 238         int             htype;
 239
 240         if ((path = strchr(arg, ':')) != NULL)
 241                 *path++ = '\0';
 242
 243         if (!path || *path != '/') {
 244                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 245                 return;
 246         }
 247
 248         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 249             (hp = gethostbyname(hname)) != NULL) {
 250                 struct hostent *hp2 = hostent_dup (hp);
 251                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 252                                    hp2->h_addrtype);
 253                 if (hp) {
 254                         free(hp2);
 255                         hp = hostent_dup(hp);
 256                 } else
 257                         hp = hp2;
 258                 exp = export_find(hp, path);
 259                 hname = hp->h_name;
 260         } else {
 261                 exp = export_lookup(hname, path, 0);
 262         }
 263
 264         if (!exp) {
 265                 if (!(eep = mkexportent(hname, path, options)) ||
 266                     !(exp = export_create(eep, 0))) {
 267                         if (hp) free (hp);
 268                         return;
 269                 }
 270         } else if (!updateexportent(&exp->m_export, options)) {
 271                 if (hp) free (hp);
 272                 return;
 273         }
 274
 275         if (verbose)
 276                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 277                         exp->m_export.e_path);
 278         exp->m_xtabent = 1;
 279         exp->m_mayexport = 1;
 280         exp->m_changed = 1;
 281         exp->m_warned = 0;
 282         validate_export(exp);
 283         if (hp) free (hp);
 284 }
 285
 286 static void
 287 unexportfs(char *arg, int verbose)
 288 {
 289         nfs_export      *exp;
 290         struct hostent  *hp = NULL;
 291         char            *path;
 292         char            *hname = arg;
 293         int             htype;
 294
 295         if ((path = strchr(arg, ':')) != NULL)
 296                 *path++ = '\0';
 297
 298         if (!path || *path != '/') {
 299                 fprintf(stderr, "Invalid unexporting option: %s\n",
 300                         arg);
 301                 return;
 302         }
 303
 304         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 305                 if ((hp = gethostbyname(hname)) != 0) {
 306                         hp = hostent_dup (hp);
 307                         hname = (char *) hp->h_name;
 308                 }
 309         }
 310
 311         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 312                 if (path && strcmp(path, exp->m_export.e_path))
 313                         continue;
 314                 if (htype != exp->m_client->m_type)
 315                         continue;
 316                 if (htype == MCL_FQDN
 317                     && !matchhostname(exp->m_export.e_hostname,
 318                                           hname))
 319                         continue;
 320                 if (htype != MCL_FQDN
 321                     && strcasecmp(exp->m_export.e_hostname, hname))
 322                         continue;
 323                 if (verbose) {
 324 #if 0
 325                         if (exp->m_exported) {
 326                                 printf("unexporting %s:%s from kernel\n",
 327                                        exp->m_client->m_hostname,
 328                                        exp->m_export.e_path);
 329                         }
 330                         else
 331 #endif
 332                                 printf("unexporting %s:%s\n",
 333                                         exp->m_client->m_hostname,
 334                                         exp->m_export.e_path);
 335                 }
 336 #if 0
 337                 if (exp->m_exported && !export_unexport(exp))
 338                         error(exp, errno);
 339 #endif
 340                 exp->m_xtabent = 0;
 341                 exp->m_mayexport = 0;
 342         }
 343
 344         if (hp) free (hp);
 345 }
 346
 347 static int can_test(void)
 348 {
 349         int fd;
 350         int n;
 351         char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
 352         fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
 353         if ( fd < 0) return 0;
 354         n = write(fd, setup, strlen(setup));
 355         close(fd);
 356         if (n < 0)
 357                 return 0;
 358         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 359         if ( fd < 0) return 0;
 360         close(fd);
 361         return 1;
 362 }
 363
 364 static int test_export(char *path, int with_fsid)
 365 {
 366         char buf[1024];
 367         int fd, n;
 368
 369         sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
 370                 path,
 371                 with_fsid ? NFSEXP_FSID : 0);
 372         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 373         if (fd < 0)
 374                 return 0;
 375         n = write(fd, buf, strlen(buf));
 376         close(fd);
 377         if (n < 0)
 378                 return 0;
 379         return 1;
 380 }
 381
 382 static void
 383 validate_export(nfs_export *exp)
 384 {
 385         /* Check that the given export point is potentially exportable.
 386          * We just give warnings here, don't cause anything to fail.
 387          * If a path doesn't exist, or is not a dir or file, give an warning
 388          * otherwise trial-export to '-test-client-' and check for failure.
 389          */
 390         struct stat stb;
 391         char *path = exp->m_export.e_path;
 392         struct statfs64 stf;
 393         int fs_has_fsid = 0;
 394
 395         if (stat(path, &stb) < 0) {
 396                 fprintf(stderr, "exportfs: Warning: %s does not exist\n",
 397                         path);
 398                 return;
 399         }
 400         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 401                 fprintf(stderr, "exportfs: Warning: %s is neither "
 402                         "a directory nor a file.\n"
 403                         "     remote access will fail\n", path);
 404                 return;
 405         }
 406         if (!can_test())
 407                 return;
 408
 409         if (!statfs64(path, &stf) &&
 410             (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
 411                 fs_has_fsid = 1;
 412
 413         if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
 414             fs_has_fsid) {
 415                 if ( !test_export(path, 1)) {
 416                         fprintf(stderr, "exportfs: Warning: %s does not "
 417                                 "support NFS export.\n",
 418                                 path);
 419                         return;
 420                 }
 421         } else if ( ! test_export(path, 0)) {
 422                 if (test_export(path, 1))
 423                         fprintf(stderr, "exportfs: Warning: %s requires fsid= "
 424                                 "for NFS export\n", path);
 425                 else
 426                         fprintf(stderr, "exportfs: Warning: %s does not "
 427                                 "support NFS export.\n",
 428                                 path);
 429                 return;
 430
 431         }
 432 }
 433
 434
 435 static char
 436 dumpopt(char c, char *fmt, ...)
 437 {
 438         va_list ap;
 439
 440         va_start(ap, fmt);
 441         printf("%c", c);
 442         vprintf(fmt, ap);
 443         va_end(ap);
 444         return ',';
 445 }
 446
 447 static void
 448 dump(int verbose)
 449 {
 450         nfs_export      *exp;
 451         struct exportent *ep;
 452         int             htype;
 453         char            *hname, c;
 454
 455         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 456                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 457                         ep = &exp->m_export;
 458                         if (!exp->m_xtabent)
 459                             continue; /* neilb */
 460                         if (htype == MCL_ANONYMOUS)
 461                                 hname = "<world>";
 462                         else
 463                                 hname = ep->e_hostname;
 464                         if (strlen(ep->e_path) > 14)
 465                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 466                         else
 467                                 printf("%-14s\t%s", ep->e_path, hname);
 468                         if (!verbose) {
 469                                 printf("\n");
 470                                 continue;
 471                         }
 472                         c = '(';
 473                         if (ep->e_flags & NFSEXP_READONLY)
 474                                 c = dumpopt(c, "ro");
 475                         else
 476                                 c = dumpopt(c, "rw");
 477                         if (ep->e_flags & NFSEXP_ASYNC)
 478                                 c = dumpopt(c, "async");
 479                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 480                                 c = dumpopt(c, "wdelay");
 481                         if (ep->e_flags & NFSEXP_NOHIDE)
 482                                 c = dumpopt(c, "nohide");
 483                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 484                                 c = dumpopt(c, "crossmnt");
 485                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 486                                 c = dumpopt(c, "insecure");
 487                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 488                                 c = dumpopt(c, "root_squash");
 489                         else
 490                                 c = dumpopt(c, "no_root_squash");
 491                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 492                                 c = dumpopt(c, "all_squash");
 493                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 494                                 c = dumpopt(c, "no_subtree_check");
 495                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 496                                 c = dumpopt(c, "insecure_locks");
 497                         if (ep->e_flags & NFSEXP_NOACL)
 498                                 c = dumpopt(c, "no_acl");
 499                         if (ep->e_flags & NFSEXP_FSID)
 500                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 501                         if (ep->e_uuid)
 502                                 c = dumpopt(c, "fsid=%s", ep->e_uuid);
 503                         if (ep->e_mountpoint)
 504                                 c = dumpopt(c, "mountpoint%s%s",
 505                                             ep->e_mountpoint[0]?"=":"",
 506                                             ep->e_mountpoint);
 507                         if (ep->e_anonuid != 65534)
 508                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 509                         if (ep->e_anongid != 65534)
 510                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 511                         switch(ep->e_fslocmethod) {
 512                         case FSLOC_NONE:
 513                                 break;
 514                         case FSLOC_REFER:
 515                                 c = dumpopt(c, "refer=%s", ep->e_fslocdata);
 516                                 break;
 517                         case FSLOC_REPLICA:
 518                                 c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
 519                                 break;
 520 #ifdef DEBUG
 521                         case FSLOC_STUB:
 522                                 c = dumpopt(c, "fsloc=stub");
 523                                 break;
 524 #endif
 525                         }
 526                         secinfo_show(stdout, ep);
 527                         printf("%c\n", (c != '(')? ')' : ' ');
 528                 }
 529         }
 530 }
 531
 532 static void
 533 error(nfs_export *exp, int err)
 534 {
 535         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 536                 exp->m_export.e_path, strerror(err));
 537 }
 538
 539 static void
 540 usage(void)
 541 {
 542         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 543         exit(1);
 544 }