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/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/vfs.h>
  18 #include <sys/stat.h>
  19 #include <sys/file.h>
  20 #include <unistd.h>
  21 #include <stdbool.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <stdarg.h>
  25 #include <getopt.h>
  26 #include <fcntl.h>
  27 #include <netdb.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30
  31 #include "sockaddr.h"
  32 #include "misc.h"
  33 #include "nfslib.h"
  34 #include "exportfs.h"
  35 #include "xlog.h"
  36
  37 static void     export_all(int verbose);
  38 static void     exportfs(char *arg, char *options, int verbose);
  39 static void     unexportfs(char *arg, int verbose);
  40 static void     exports_update(int verbose);
  41 static void     dump(int verbose);
  42 static void     error(nfs_export *exp, int err);
  43 static void     usage(const char *progname);
  44 static void     validate_export(nfs_export *exp);
  45 static int      matchhostname(const char *hostname1, const char *hostname2);
  46 static void     export_d_read(const char *dname);
  47
  48 static const char *lockfile = EXP_LOCKFILE;
  49 static int _lockfd = -1;
  50
  51 /*
  52  * If we aren't careful, changes made by exportfs can be lost
  53  * when multiple exports process run at once:
  54  *
  55  *      exportfs process 1      exportfs process 2
  56  *      ------------------------------------------
  57  *      reads etab version A    reads etab version A
  58  *      adds new export B       adds new export C
  59  *      writes A+B              writes A+C
  60  *
  61  * The locking in support/export/xtab.c will prevent mountd from
  62  * seeing a partially written version of etab, and will prevent
  63  * the two writers above from writing simultaneously and
  64  * corrupting etab, but to prevent problems like the above we
  65  * need these additional lockfile() routines.
  66  */
  67 void
  68 grab_lockfile()
  69 {
  70         _lockfd = open(lockfile, O_CREAT|O_RDWR, 0666);
  71         if (_lockfd != -1)
  72                 lockf(_lockfd, F_LOCK, 0);
  73 }
  74 void
  75 release_lockfile()
  76 {
  77         if (_lockfd != -1)
  78                 lockf(_lockfd, F_ULOCK, 0);
  79 }
  80
  81 int
  82 main(int argc, char **argv)
  83 {
  84         char    *options = NULL;
  85         char    *progname = NULL;
  86         int     f_export = 1;
  87         int     f_all = 0;
  88         int     f_verbose = 0;
  89         int     f_reexport = 0;
  90         int     f_ignore = 0;
  91         int     i, c;
  92         int     new_cache = 0;
  93         int     force_flush = 0;
  94
  95         if ((progname = strrchr(argv[0], '/')) != NULL)
  96                 progname++;
  97         else
  98                 progname = argv[0];
  99
 100         xlog_open(progname);
 101         xlog_stderr(1);
 102         xlog_syslog(0);
 103
 104         export_errno = 0;
 105
 106         while ((c = getopt(argc, argv, "aio:ruvf")) != EOF) {
 107                 switch(c) {
 108                 case 'a':
 109                         f_all = 1;
 110                         break;
 111                 case 'i':
 112                         f_ignore = 1;
 113                         break;
 114                 case 'o':
 115                         options = optarg;
 116                         break;
 117                 case 'r':
 118                         f_reexport = 1;
 119                         f_all = 1;
 120                         break;
 121                 case 'u':
 122                         f_export = 0;
 123                         break;
 124                 case 'v':
 125                         f_verbose = 1;
 126                         break;
 127                 case 'f':
 128                         force_flush = 1;
 129                         break;
 130                 default:
 131                         usage(progname);
 132                         break;
 133                 }
 134         }
 135
 136         if (optind != argc && f_all) {
 137                 xlog(L_ERROR, "extra arguments are not permitted with -a or -r");
 138                 return 1;
 139         }
 140         if (f_ignore && (f_all || ! f_export)) {
 141                 xlog(L_ERROR, "-i not meaningful with -a, -r or -u");
 142                 return 1;
 143         }
 144         if (f_reexport && ! f_export) {
 145                 xlog(L_ERROR, "-r and -u are incompatible");
 146                 return 1;
 147         }
 148         new_cache = check_new_cache();
 149         if (optind == argc && ! f_all) {
 150                 if (force_flush) {
 151                         if (new_cache)
 152                                 cache_flush(1);
 153                         else {
 154                                 xlog(L_ERROR, "-f is available only "
 155                                         "with new cache controls. "
 156                                         "Mount /proc/fs/nfsd first");
 157                                 return 1;
 158                         }
 159                         return 0;
 160                 } else {
 161                         xtab_export_read();
 162                         dump(f_verbose);
 163                         return 0;
 164                 }
 165         }
 166
 167         /*
 168          * Serialize things as best we can
 169          */
 170         grab_lockfile();
 171         atexit(release_lockfile);
 172
 173         if (f_export && ! f_ignore) {
 174                 export_read(_PATH_EXPORTS);
 175                 export_d_read(_PATH_EXPORTS_D);
 176         }
 177         if (f_export) {
 178                 if (f_all)
 179                         export_all(f_verbose);
 180                 else
 181                         for (i = optind; i < argc ; i++)
 182                                 exportfs(argv[i], options, f_verbose);
 183         }
 184         /* If we are unexporting everything, then
 185          * don't care about what should be exported, as that
 186          * may require DNS lookups..
 187          */
 188         if (! ( !f_export && f_all)) {
 189                 /* note: xtab_*_read does not update entries if they already exist,
 190                  * so this will not lose new options
 191                  */
 192                 if (!f_reexport)
 193                         xtab_export_read();
 194                 if (!f_export)
 195                         for (i = optind ; i < argc ; i++)
 196                                 unexportfs(argv[i], f_verbose);
 197                 if (!new_cache)
 198                         rmtab_read();
 199         }
 200         if (!new_cache) {
 201                 xtab_mount_read();
 202                 exports_update(f_verbose);
 203         }
 204         xtab_export_write();
 205         if (new_cache)
 206                 cache_flush(force_flush);
 207         if (!new_cache)
 208                 xtab_mount_write();
 209
 210         return export_errno;
 211 }
 212
 213 static void
 214 exports_update_one(nfs_export *exp, int verbose)
 215 {
 216                 /* check mountpoint option */
 217         if (exp->m_mayexport &&
 218             exp->m_export.e_mountpoint &&
 219             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 220                            exp->m_export.e_mountpoint:
 221                            exp->m_export.e_path)) {
 222                 printf("%s not exported as %s not a mountpoint.\n",
 223                        exp->m_export.e_path, exp->m_export.e_mountpoint);
 224                 exp->m_mayexport = 0;
 225         }
 226         if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 227                 if (verbose)
 228                         printf("%sexporting %s:%s to kernel\n",
 229                                exp->m_exported ?"re":"",
 230                                exp->m_client->m_hostname,
 231                                exp->m_export.e_path);
 232                 if (!export_export(exp))
 233                         error(exp, errno);
 234         }
 235         if (exp->m_exported && ! exp->m_mayexport) {
 236                 if (verbose)
 237                         printf("unexporting %s:%s from kernel\n",
 238                                exp->m_client->m_hostname,
 239                                exp->m_export.e_path);
 240                 if (!export_unexport(exp))
 241                         error(exp, errno);
 242         }
 243 }
 244
 245
 246 /* we synchronise intention with reality.
 247  * entries with m_mayexport get exported
 248  * entries with m_exported but not m_mayexport get unexported
 249  * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
 250  */
 251 static void
 252 exports_update(int verbose)
 253 {
 254         nfs_export      *exp;
 255
 256         for (exp = exportlist[MCL_FQDN].p_head; exp; exp=exp->m_next) {
 257                 exports_update_one(exp, verbose);
 258         }
 259         for (exp = exportlist[MCL_GSS].p_head; exp; exp=exp->m_next) {
 260                 exports_update_one(exp, verbose);
 261         }
 262 }
 263
 264 /*
 265  * export_all finds all entries and
 266  *    marks them xtabent and mayexport so that they get exported
 267  */
 268 static void
 269 export_all(int verbose)
 270 {
 271         nfs_export      *exp;
 272         int             i;
 273
 274         for (i = 0; i < MCL_MAXTYPES; i++) {
 275                 for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
 276                         if (verbose)
 277                                 printf("exporting %s:%s\n",
 278                                        exp->m_client->m_hostname,
 279                                        exp->m_export.e_path);
 280                         exp->m_xtabent = 1;
 281                         exp->m_mayexport = 1;
 282                         exp->m_changed = 1;
 283                         exp->m_warned = 0;
 284                         validate_export(exp);
 285                 }
 286         }
 287 }
 288
 289
 290 static void
 291 exportfs(char *arg, char *options, int verbose)
 292 {
 293         struct exportent *eep;
 294         nfs_export      *exp = NULL;
 295         struct addrinfo *ai = NULL;
 296         char            *path;
 297         char            *hname = arg;
 298         int             htype;
 299
 300         if ((path = strchr(arg, ':')) != NULL)
 301                 *path++ = '\0';
 302
 303         if (!path || *path != '/') {
 304                 xlog(L_ERROR, "Invalid exporting option: %s", arg);
 305                 return;
 306         }
 307
 308         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 309                 ai = host_addrinfo(hname);
 310                 if (ai != NULL) {
 311                         exp = export_find(ai, path);
 312                         hname = ai->ai_canonname;
 313                 }
 314         } else
 315                 exp = export_lookup(hname, path, 0);
 316
 317         if (!exp) {
 318                 if (!(eep = mkexportent(hname, path, options)) ||
 319                     !(exp = export_create(eep, 0)))
 320                         goto out;
 321         } else if (!updateexportent(&exp->m_export, options))
 322                 goto out;
 323
 324         if (verbose)
 325                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 326                         exp->m_export.e_path);
 327         exp->m_xtabent = 1;
 328         exp->m_mayexport = 1;
 329         exp->m_changed = 1;
 330         exp->m_warned = 0;
 331         validate_export(exp);
 332
 333 out:
 334         freeaddrinfo(ai);
 335 }
 336
 337 static void
 338 unexportfs(char *arg, int verbose)
 339 {
 340         nfs_export      *exp;
 341         struct addrinfo *ai = NULL;
 342         char            *path;
 343         char            *hname = arg;
 344         int             htype;
 345
 346         if ((path = strchr(arg, ':')) != NULL)
 347                 *path++ = '\0';
 348
 349         if (!path || *path != '/') {
 350                 xlog(L_ERROR, "Invalid unexporting option: %s", arg);
 351                 return;
 352         }
 353
 354         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 355                 ai = host_addrinfo(hname);
 356                 if (ai)
 357                         hname = ai->ai_canonname;
 358         }
 359
 360         for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 361                 if (path && strcmp(path, exp->m_export.e_path))
 362                         continue;
 363                 if (htype != exp->m_client->m_type)
 364                         continue;
 365                 if (htype == MCL_FQDN
 366                     && !matchhostname(exp->m_export.e_hostname,
 367                                           hname))
 368                         continue;
 369                 if (htype != MCL_FQDN
 370                     && strcasecmp(exp->m_export.e_hostname, hname))
 371                         continue;
 372                 if (verbose) {
 373 #if 0
 374                         if (exp->m_exported) {
 375                                 printf("unexporting %s:%s from kernel\n",
 376                                        exp->m_client->m_hostname,
 377                                        exp->m_export.e_path);
 378                         }
 379                         else
 380 #endif
 381                                 printf("unexporting %s:%s\n",
 382                                         exp->m_client->m_hostname,
 383                                         exp->m_export.e_path);
 384                 }
 385 #if 0
 386                 if (exp->m_exported && !export_unexport(exp))
 387                         error(exp, errno);
 388 #endif
 389                 exp->m_xtabent = 0;
 390                 exp->m_mayexport = 0;
 391         }
 392
 393         freeaddrinfo(ai);
 394 }
 395
 396 static int can_test(void)
 397 {
 398         int fd;
 399         int n;
 400         char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
 401         fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
 402         if ( fd < 0) return 0;
 403         n = write(fd, setup, strlen(setup));
 404         close(fd);
 405         if (n < 0)
 406                 return 0;
 407         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 408         if ( fd < 0) return 0;
 409         close(fd);
 410         return 1;
 411 }
 412
 413 static int test_export(char *path, int with_fsid)
 414 {
 415         char buf[1024];
 416         int fd, n;
 417
 418         sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
 419                 path,
 420                 with_fsid ? NFSEXP_FSID : 0);
 421         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 422         if (fd < 0)
 423                 return 0;
 424         n = write(fd, buf, strlen(buf));
 425         close(fd);
 426         if (n < 0)
 427                 return 0;
 428         return 1;
 429 }
 430
 431 static void
 432 validate_export(nfs_export *exp)
 433 {
 434         /* Check that the given export point is potentially exportable.
 435          * We just give warnings here, don't cause anything to fail.
 436          * If a path doesn't exist, or is not a dir or file, give an warning
 437          * otherwise trial-export to '-test-client-' and check for failure.
 438          */
 439         struct stat stb;
 440         char *path = exp->m_export.e_path;
 441         struct statfs64 stf;
 442         int fs_has_fsid = 0;
 443
 444         if (stat(path, &stb) < 0) {
 445                 xlog(L_ERROR, "Failed to stat %s: %m", path);
 446                 return;
 447         }
 448         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 449                 xlog(L_ERROR, "%s is neither a directory nor a file. "
 450                         "Remote access will fail", path);
 451                 return;
 452         }
 453         if (!can_test())
 454                 return;
 455
 456         if (!statfs64(path, &stf) &&
 457             (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
 458                 fs_has_fsid = 1;
 459
 460         if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
 461             fs_has_fsid) {
 462                 if ( !test_export(path, 1)) {
 463                         xlog(L_ERROR, "%s does not support NFS export", path);
 464                         return;
 465                 }
 466         } else if ( ! test_export(path, 0)) {
 467                 if (test_export(path, 1))
 468                         xlog(L_ERROR, "%s requires fsid= for NFS export", path);
 469                 else
 470                         xlog(L_ERROR, "%s does not support NFS export", path);
 471                 return;
 472
 473         }
 474 }
 475
 476 static _Bool
 477 is_hostname(const char *sp)
 478 {
 479         if (*sp == '\0' || *sp == '@')
 480                 return false;
 481
 482         for (; *sp != '\0'; sp++) {
 483                 if (*sp == '*' || *sp == '?' || *sp == '[' || *sp == '/')
 484                         return false;
 485                 if (*sp == '\\' && sp[1] != '\0')
 486                         sp++;
 487         }
 488
 489         return true;
 490 }
 491
 492 /*
 493  * Take care to perform an explicit reverse lookup on presentation
 494  * addresses.  Otherwise we don't get a real canonical name or a
 495  * complete list of addresses.
 496  */
 497 static struct addrinfo *
 498 address_list(const char *hostname)
 499 {
 500         struct addrinfo *ai;
 501         char *cname;
 502
 503         ai = host_pton(hostname);
 504         if (ai != NULL) {
 505                 /* @hostname was a presentation address */
 506                 cname = host_canonname(ai->ai_addr);
 507                 freeaddrinfo(ai);
 508                 if (cname != NULL)
 509                         goto out;
 510         }
 511         /* @hostname was a hostname or had no reverse mapping */
 512         cname = strdup(hostname);
 513         if (cname == NULL)
 514                 return NULL;
 515
 516 out:
 517         ai = host_addrinfo(cname);
 518         free(cname);
 519         return ai;
 520 }
 521
 522 static int
 523 matchhostname(const char *hostname1, const char *hostname2)
 524 {
 525         struct addrinfo *results1 = NULL, *results2 = NULL;
 526         struct addrinfo *ai1, *ai2;
 527         int result = 0;
 528
 529         if (strcasecmp(hostname1, hostname2) == 0)
 530                 return 1;
 531
 532         /*
 533          * Don't pass export wildcards or netgroup names to DNS
 534          */
 535         if (!is_hostname(hostname1) || !is_hostname(hostname2))
 536                 return 0;
 537
 538         results1 = address_list(hostname1);
 539         if (results1 == NULL)
 540                 goto out;
 541         results2 = address_list(hostname2);
 542         if (results2 == NULL)
 543                 goto out;
 544
 545         if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
 546                 result = 1;
 547                 goto out;
 548         }
 549
 550         for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
 551                 for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
 552                         if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
 553                                 result = 1;
 554                                 break;
 555                         }
 556
 557 out:
 558         freeaddrinfo(results1);
 559         freeaddrinfo(results2);
 560         return result;
 561 }
 562
 563 /* Based on mnt_table_parse_dir() in
 564    util-linux-ng/shlibs/mount/src/tab_parse.c */
 565 static void
 566 export_d_read(const char *dname)
 567 {
 568         int n = 0, i;
 569         struct dirent **namelist = NULL;
 570
 571
 572         n = scandir(dname, &namelist, NULL, versionsort);
 573         if (n < 0) {
 574                 if (errno == ENOENT)
 575                         /* Silently return */
 576                         return;
 577                 xlog(L_NOTICE, "scandir %s: %s", dname, strerror(errno));
 578         } else if (n == 0)
 579                 return;
 580
 581         for (i = 0; i < n; i++) {
 582                 struct dirent *d = namelist[i];
 583                 size_t namesz;
 584                 char fname[PATH_MAX + 1];
 585                 int fname_len;
 586
 587
 588                 if (d->d_type != DT_UNKNOWN
 589                     && d->d_type != DT_REG
 590                     && d->d_type != DT_LNK)
 591                         continue;
 592                 if (*d->d_name == '.')
 593                         continue;
 594
 595 #define _EXT_EXPORT_SIZ   (sizeof(_EXT_EXPORT) - 1)
 596                 namesz = strlen(d->d_name);
 597                 if (!namesz
 598                     || namesz < _EXT_EXPORT_SIZ + 1
 599                     || strcmp(d->d_name + (namesz - _EXT_EXPORT_SIZ),
 600                               _EXT_EXPORT))
 601                         continue;
 602
 603                 fname_len = snprintf(fname, PATH_MAX +1, "%s/%s", dname, d->d_name);
 604                 if (fname_len > PATH_MAX) {
 605                         xlog(L_WARNING, "Too long file name: %s in %s", d->d_name, dname);
 606                         continue;
 607                 }
 608
 609                 export_read(fname);
 610         }
 611
 612         for (i = 0; i < n; i++)
 613                 free(namelist[i]);
 614         free(namelist);
 615
 616         return;
 617 }
 618
 619 static char
 620 dumpopt(char c, char *fmt, ...)
 621 {
 622         va_list ap;
 623
 624         va_start(ap, fmt);
 625         printf("%c", c);
 626         vprintf(fmt, ap);
 627         va_end(ap);
 628         return ',';
 629 }
 630
 631 static void
 632 dump(int verbose)
 633 {
 634         nfs_export      *exp;
 635         struct exportent *ep;
 636         int             htype;
 637         char            *hname, c;
 638
 639         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 640                 for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 641                         ep = &exp->m_export;
 642                         if (!exp->m_xtabent)
 643                             continue; /* neilb */
 644                         if (htype == MCL_ANONYMOUS)
 645                                 hname = "<world>";
 646                         else
 647                                 hname = ep->e_hostname;
 648                         if (strlen(ep->e_path) > 14)
 649                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 650                         else
 651                                 printf("%-14s\t%s", ep->e_path, hname);
 652                         if (!verbose) {
 653                                 printf("\n");
 654                                 continue;
 655                         }
 656                         c = '(';
 657                         if (ep->e_flags & NFSEXP_READONLY)
 658                                 c = dumpopt(c, "ro");
 659                         else
 660                                 c = dumpopt(c, "rw");
 661                         if (ep->e_flags & NFSEXP_ASYNC)
 662                                 c = dumpopt(c, "async");
 663                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 664                                 c = dumpopt(c, "wdelay");
 665                         if (ep->e_flags & NFSEXP_NOHIDE)
 666                                 c = dumpopt(c, "nohide");
 667                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 668                                 c = dumpopt(c, "crossmnt");
 669                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 670                                 c = dumpopt(c, "insecure");
 671                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 672                                 c = dumpopt(c, "root_squash");
 673                         else
 674                                 c = dumpopt(c, "no_root_squash");
 675                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 676                                 c = dumpopt(c, "all_squash");
 677                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 678                                 c = dumpopt(c, "no_subtree_check");
 679                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 680                                 c = dumpopt(c, "insecure_locks");
 681                         if (ep->e_flags & NFSEXP_NOACL)
 682                                 c = dumpopt(c, "no_acl");
 683                         if (ep->e_flags & NFSEXP_FSID)
 684                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 685                         if (ep->e_uuid)
 686                                 c = dumpopt(c, "fsid=%s", ep->e_uuid);
 687                         if (ep->e_mountpoint)
 688                                 c = dumpopt(c, "mountpoint%s%s",
 689                                             ep->e_mountpoint[0]?"=":"",
 690                                             ep->e_mountpoint);
 691                         if (ep->e_anonuid != 65534)
 692                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 693                         if (ep->e_anongid != 65534)
 694                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 695                         switch(ep->e_fslocmethod) {
 696                         case FSLOC_NONE:
 697                                 break;
 698                         case FSLOC_REFER:
 699                                 c = dumpopt(c, "refer=%s", ep->e_fslocdata);
 700                                 break;
 701                         case FSLOC_REPLICA:
 702                                 c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
 703                                 break;
 704 #ifdef DEBUG
 705                         case FSLOC_STUB:
 706                                 c = dumpopt(c, "fsloc=stub");
 707                                 break;
 708 #endif
 709                         }
 710                         secinfo_show(stdout, ep);
 711                         printf("%c\n", (c != '(')? ')' : ' ');
 712                 }
 713         }
 714 }
 715
 716 static void
 717 error(nfs_export *exp, int err)
 718 {
 719         xlog(L_ERROR, "%s:%s: %s", exp->m_client->m_hostname,
 720                 exp->m_export.e_path, strerror(err));
 721 }
 722
 723 static void
 724 usage(const char *progname)
 725 {
 726         fprintf(stderr, "usage: %s [-aruv] [host:/path]\n", progname);
 727         exit(1);
 728 }