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, int n);
  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 static void grab_lockfile(void);
  48 static void release_lockfile(void);
  49
  50 static const char *lockfile = EXP_LOCKFILE;
  51 static int _lockfd = -1;
  52
  53 /*
  54  * If we aren't careful, changes made by exportfs can be lost
  55  * when multiple exports process run at once:
  56  *
  57  *      exportfs process 1      exportfs process 2
  58  *      ------------------------------------------
  59  *      reads etab version A    reads etab version A
  60  *      adds new export B       adds new export C
  61  *      writes A+B              writes A+C
  62  *
  63  * The locking in support/export/xtab.c will prevent mountd from
  64  * seeing a partially written version of etab, and will prevent
  65  * the two writers above from writing simultaneously and
  66  * corrupting etab, but to prevent problems like the above we
  67  * need these additional lockfile() routines.
  68  */
  69 static void
  70 grab_lockfile()
  71 {
  72         _lockfd = open(lockfile, O_CREAT|O_RDWR, 0666);
  73         if (_lockfd != -1)
  74                 lockf(_lockfd, F_LOCK, 0);
  75 }
  76 static void
  77 release_lockfile()
  78 {
  79         if (_lockfd != -1)
  80                 lockf(_lockfd, F_ULOCK, 0);
  81 }
  82
  83 int
  84 main(int argc, char **argv)
  85 {
  86         char    *options = NULL;
  87         char    *progname = NULL;
  88         int     f_export = 1;
  89         int     f_all = 0;
  90         int     f_verbose = 0;
  91         int     f_reexport = 0;
  92         int     f_ignore = 0;
  93         int     i, c;
  94         int     new_cache = 0;
  95         int     force_flush = 0;
  96
  97         if ((progname = strrchr(argv[0], '/')) != NULL)
  98                 progname++;
  99         else
 100                 progname = argv[0];
 101
 102         xlog_open(progname);
 103         xlog_stderr(1);
 104         xlog_syslog(0);
 105
 106         export_errno = 0;
 107
 108         while ((c = getopt(argc, argv, "afhio:ruv")) != EOF) {
 109                 switch(c) {
 110                 case 'a':
 111                         f_all = 1;
 112                         break;
 113                 case 'f':
 114                         force_flush = 1;
 115                         break;
 116                 case 'h':
 117                         usage(progname, 0);
 118                         break;
 119                 case 'i':
 120                         f_ignore = 1;
 121                         break;
 122                 case 'o':
 123                         options = optarg;
 124                         break;
 125                 case 'r':
 126                         f_reexport = 1;
 127                         f_all = 1;
 128                         break;
 129                 case 'u':
 130                         f_export = 0;
 131                         break;
 132                 case 'v':
 133                         f_verbose = 1;
 134                         break;
 135                 default:
 136                         usage(progname, 1);
 137                         break;
 138                 }
 139         }
 140
 141         if (optind != argc && f_all) {
 142                 xlog(L_ERROR, "extra arguments are not permitted with -a or -r");
 143                 return 1;
 144         }
 145         if (f_ignore && (f_all || ! f_export)) {
 146                 xlog(L_ERROR, "-i not meaningful with -a, -r or -u");
 147                 return 1;
 148         }
 149         if (f_reexport && ! f_export) {
 150                 xlog(L_ERROR, "-r and -u are incompatible");
 151                 return 1;
 152         }
 153         new_cache = check_new_cache();
 154         if (optind == argc && ! f_all) {
 155                 if (force_flush) {
 156                         if (new_cache)
 157                                 cache_flush(1);
 158                         else {
 159                                 xlog(L_ERROR, "-f is available only "
 160                                         "with new cache controls. "
 161                                         "Mount /proc/fs/nfsd first");
 162                                 return 1;
 163                         }
 164                         return 0;
 165                 } else {
 166                         xtab_export_read();
 167                         dump(f_verbose);
 168                         return 0;
 169                 }
 170         }
 171
 172         /*
 173          * Serialize things as best we can
 174          */
 175         grab_lockfile();
 176         atexit(release_lockfile);
 177
 178         if (f_export && ! f_ignore) {
 179                 export_read(_PATH_EXPORTS);
 180                 export_d_read(_PATH_EXPORTS_D);
 181         }
 182         if (f_export) {
 183                 if (f_all)
 184                         export_all(f_verbose);
 185                 else
 186                         for (i = optind; i < argc ; i++)
 187                                 exportfs(argv[i], options, f_verbose);
 188         }
 189         /* If we are unexporting everything, then
 190          * don't care about what should be exported, as that
 191          * may require DNS lookups..
 192          */
 193         if (! ( !f_export && f_all)) {
 194                 /* note: xtab_*_read does not update entries if they already exist,
 195                  * so this will not lose new options
 196                  */
 197                 if (!f_reexport)
 198                         xtab_export_read();
 199                 if (!f_export)
 200                         for (i = optind ; i < argc ; i++)
 201                                 unexportfs(argv[i], f_verbose);
 202                 if (!new_cache)
 203                         rmtab_read();
 204         }
 205         if (!new_cache) {
 206                 xtab_mount_read();
 207                 exports_update(f_verbose);
 208         }
 209         xtab_export_write();
 210         if (new_cache)
 211                 cache_flush(force_flush);
 212         if (!new_cache)
 213                 xtab_mount_write();
 214
 215         return export_errno;
 216 }
 217
 218 static void
 219 exports_update_one(nfs_export *exp, int verbose)
 220 {
 221                 /* check mountpoint option */
 222         if (exp->m_mayexport &&
 223             exp->m_export.e_mountpoint &&
 224             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 225                            exp->m_export.e_mountpoint:
 226                            exp->m_export.e_path)) {
 227                 printf("%s not exported as %s not a mountpoint.\n",
 228                        exp->m_export.e_path, exp->m_export.e_mountpoint);
 229                 exp->m_mayexport = 0;
 230         }
 231         if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 232                 if (verbose)
 233                         printf("%sexporting %s:%s to kernel\n",
 234                                exp->m_exported ?"re":"",
 235                                exp->m_client->m_hostname,
 236                                exp->m_export.e_path);
 237                 if (!export_export(exp))
 238                         error(exp, errno);
 239         }
 240         if (exp->m_exported && ! exp->m_mayexport) {
 241                 if (verbose)
 242                         printf("unexporting %s:%s from kernel\n",
 243                                exp->m_client->m_hostname,
 244                                exp->m_export.e_path);
 245                 if (!export_unexport(exp))
 246                         error(exp, errno);
 247         }
 248 }
 249
 250
 251 /* we synchronise intention with reality.
 252  * entries with m_mayexport get exported
 253  * entries with m_exported but not m_mayexport get unexported
 254  * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
 255  */
 256 static void
 257 exports_update(int verbose)
 258 {
 259         nfs_export      *exp;
 260
 261         for (exp = exportlist[MCL_FQDN].p_head; exp; exp=exp->m_next) {
 262                 exports_update_one(exp, verbose);
 263         }
 264         for (exp = exportlist[MCL_GSS].p_head; exp; exp=exp->m_next) {
 265                 exports_update_one(exp, verbose);
 266         }
 267 }
 268
 269 /*
 270  * export_all finds all entries and
 271  *    marks them xtabent and mayexport so that they get exported
 272  */
 273 static void
 274 export_all(int verbose)
 275 {
 276         nfs_export      *exp;
 277         int             i;
 278
 279         for (i = 0; i < MCL_MAXTYPES; i++) {
 280                 for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
 281                         if (verbose)
 282                                 printf("exporting %s:%s\n",
 283                                        exp->m_client->m_hostname,
 284                                        exp->m_export.e_path);
 285                         exp->m_xtabent = 1;
 286                         exp->m_mayexport = 1;
 287                         exp->m_changed = 1;
 288                         exp->m_warned = 0;
 289                         validate_export(exp);
 290                 }
 291         }
 292 }
 293
 294
 295 static void
 296 exportfs(char *arg, char *options, int verbose)
 297 {
 298         struct exportent *eep;
 299         nfs_export      *exp = NULL;
 300         struct addrinfo *ai = NULL;
 301         char            *path;
 302         char            *hname = arg;
 303         int             htype;
 304
 305         if ((path = strchr(arg, ':')) != NULL)
 306                 *path++ = '\0';
 307
 308         if (!path || *path != '/') {
 309                 xlog(L_ERROR, "Invalid exporting option: %s", arg);
 310                 return;
 311         }
 312
 313         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 314                 ai = host_addrinfo(hname);
 315                 if (ai != NULL) {
 316                         exp = export_find(ai, path);
 317                         hname = ai->ai_canonname;
 318                 }
 319         } else
 320                 exp = export_lookup(hname, path, 0);
 321
 322         if (!exp) {
 323                 if (!(eep = mkexportent(hname, path, options)) ||
 324                     !(exp = export_create(eep, 0)))
 325                         goto out;
 326         } else if (!updateexportent(&exp->m_export, options))
 327                 goto out;
 328
 329         if (verbose)
 330                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 331                         exp->m_export.e_path);
 332         exp->m_xtabent = 1;
 333         exp->m_mayexport = 1;
 334         exp->m_changed = 1;
 335         exp->m_warned = 0;
 336         validate_export(exp);
 337
 338 out:
 339         freeaddrinfo(ai);
 340 }
 341
 342 static void
 343 unexportfs(char *arg, int verbose)
 344 {
 345         nfs_export      *exp;
 346         struct addrinfo *ai = NULL;
 347         char            *path;
 348         char            *hname = arg;
 349         int             htype;
 350
 351         if ((path = strchr(arg, ':')) != NULL)
 352                 *path++ = '\0';
 353
 354         if (!path || *path != '/') {
 355                 xlog(L_ERROR, "Invalid unexporting option: %s", arg);
 356                 return;
 357         }
 358
 359         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 360                 ai = host_addrinfo(hname);
 361                 if (ai)
 362                         hname = ai->ai_canonname;
 363         }
 364
 365         for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 366                 if (path && strcmp(path, exp->m_export.e_path))
 367                         continue;
 368                 if (htype != exp->m_client->m_type)
 369                         continue;
 370                 if (htype == MCL_FQDN
 371                     && !matchhostname(exp->m_export.e_hostname,
 372                                           hname))
 373                         continue;
 374                 if (htype != MCL_FQDN
 375                     && strcasecmp(exp->m_export.e_hostname, hname))
 376                         continue;
 377                 if (verbose) {
 378 #if 0
 379                         if (exp->m_exported) {
 380                                 printf("unexporting %s:%s from kernel\n",
 381                                        exp->m_client->m_hostname,
 382                                        exp->m_export.e_path);
 383                         }
 384                         else
 385 #endif
 386                                 printf("unexporting %s:%s\n",
 387                                         exp->m_client->m_hostname,
 388                                         exp->m_export.e_path);
 389                 }
 390 #if 0
 391                 if (exp->m_exported && !export_unexport(exp))
 392                         error(exp, errno);
 393 #endif
 394                 exp->m_xtabent = 0;
 395                 exp->m_mayexport = 0;
 396         }
 397
 398         freeaddrinfo(ai);
 399 }
 400
 401 static int can_test(void)
 402 {
 403         int fd;
 404         int n;
 405         char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
 406         fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
 407         if ( fd < 0) return 0;
 408         n = write(fd, setup, strlen(setup));
 409         close(fd);
 410         if (n < 0)
 411                 return 0;
 412         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 413         if ( fd < 0) return 0;
 414         close(fd);
 415         return 1;
 416 }
 417
 418 static int test_export(char *path, int with_fsid)
 419 {
 420         char buf[1024];
 421         int fd, n;
 422
 423         sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
 424                 path,
 425                 with_fsid ? NFSEXP_FSID : 0);
 426         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 427         if (fd < 0)
 428                 return 0;
 429         n = write(fd, buf, strlen(buf));
 430         close(fd);
 431         if (n < 0)
 432                 return 0;
 433         return 1;
 434 }
 435
 436 static void
 437 validate_export(nfs_export *exp)
 438 {
 439         /* Check that the given export point is potentially exportable.
 440          * We just give warnings here, don't cause anything to fail.
 441          * If a path doesn't exist, or is not a dir or file, give an warning
 442          * otherwise trial-export to '-test-client-' and check for failure.
 443          */
 444         struct stat stb;
 445         char *path = exp->m_export.e_path;
 446         struct statfs64 stf;
 447         int fs_has_fsid = 0;
 448
 449         if (stat(path, &stb) < 0) {
 450                 xlog(L_ERROR, "Failed to stat %s: %m", path);
 451                 return;
 452         }
 453         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 454                 xlog(L_ERROR, "%s is neither a directory nor a file. "
 455                         "Remote access will fail", path);
 456                 return;
 457         }
 458         if (!can_test())
 459                 return;
 460
 461         if (!statfs64(path, &stf) &&
 462             (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
 463                 fs_has_fsid = 1;
 464
 465         if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
 466             fs_has_fsid) {
 467                 if ( !test_export(path, 1)) {
 468                         xlog(L_ERROR, "%s does not support NFS export", path);
 469                         return;
 470                 }
 471         } else if ( ! test_export(path, 0)) {
 472                 if (test_export(path, 1))
 473                         xlog(L_ERROR, "%s requires fsid= for NFS export", path);
 474                 else
 475                         xlog(L_ERROR, "%s does not support NFS export", path);
 476                 return;
 477
 478         }
 479 }
 480
 481 static _Bool
 482 is_hostname(const char *sp)
 483 {
 484         if (*sp == '\0' || *sp == '@')
 485                 return false;
 486
 487         for (; *sp != '\0'; sp++) {
 488                 if (*sp == '*' || *sp == '?' || *sp == '[' || *sp == '/')
 489                         return false;
 490                 if (*sp == '\\' && sp[1] != '\0')
 491                         sp++;
 492         }
 493
 494         return true;
 495 }
 496
 497 /*
 498  * Take care to perform an explicit reverse lookup on presentation
 499  * addresses.  Otherwise we don't get a real canonical name or a
 500  * complete list of addresses.
 501  */
 502 static struct addrinfo *
 503 address_list(const char *hostname)
 504 {
 505         struct addrinfo *ai;
 506         char *cname;
 507
 508         ai = host_pton(hostname);
 509         if (ai != NULL) {
 510                 /* @hostname was a presentation address */
 511                 cname = host_canonname(ai->ai_addr);
 512                 freeaddrinfo(ai);
 513                 if (cname != NULL)
 514                         goto out;
 515         }
 516         /* @hostname was a hostname or had no reverse mapping */
 517         cname = strdup(hostname);
 518         if (cname == NULL)
 519                 return NULL;
 520
 521 out:
 522         ai = host_addrinfo(cname);
 523         free(cname);
 524         return ai;
 525 }
 526
 527 static int
 528 matchhostname(const char *hostname1, const char *hostname2)
 529 {
 530         struct addrinfo *results1 = NULL, *results2 = NULL;
 531         struct addrinfo *ai1, *ai2;
 532         int result = 0;
 533
 534         if (strcasecmp(hostname1, hostname2) == 0)
 535                 return 1;
 536
 537         /*
 538          * Don't pass export wildcards or netgroup names to DNS
 539          */
 540         if (!is_hostname(hostname1) || !is_hostname(hostname2))
 541                 return 0;
 542
 543         results1 = address_list(hostname1);
 544         if (results1 == NULL)
 545                 goto out;
 546         results2 = address_list(hostname2);
 547         if (results2 == NULL)
 548                 goto out;
 549
 550         if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
 551                 result = 1;
 552                 goto out;
 553         }
 554
 555         for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
 556                 for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
 557                         if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
 558                                 result = 1;
 559                                 break;
 560                         }
 561
 562 out:
 563         freeaddrinfo(results1);
 564         freeaddrinfo(results2);
 565         return result;
 566 }
 567
 568 /* Based on mnt_table_parse_dir() in
 569    util-linux-ng/shlibs/mount/src/tab_parse.c */
 570 static void
 571 export_d_read(const char *dname)
 572 {
 573         int n = 0, i;
 574         struct dirent **namelist = NULL;
 575
 576
 577         n = scandir(dname, &namelist, NULL, versionsort);
 578         if (n < 0) {
 579                 if (errno == ENOENT)
 580                         /* Silently return */
 581                         return;
 582                 xlog(L_NOTICE, "scandir %s: %s", dname, strerror(errno));
 583         } else if (n == 0)
 584                 return;
 585
 586         for (i = 0; i < n; i++) {
 587                 struct dirent *d = namelist[i];
 588                 size_t namesz;
 589                 char fname[PATH_MAX + 1];
 590                 int fname_len;
 591
 592
 593                 if (d->d_type != DT_UNKNOWN
 594                     && d->d_type != DT_REG
 595                     && d->d_type != DT_LNK)
 596                         continue;
 597                 if (*d->d_name == '.')
 598                         continue;
 599
 600 #define _EXT_EXPORT_SIZ   (sizeof(_EXT_EXPORT) - 1)
 601                 namesz = strlen(d->d_name);
 602                 if (!namesz
 603                     || namesz < _EXT_EXPORT_SIZ + 1
 604                     || strcmp(d->d_name + (namesz - _EXT_EXPORT_SIZ),
 605                               _EXT_EXPORT))
 606                         continue;
 607
 608                 fname_len = snprintf(fname, PATH_MAX +1, "%s/%s", dname, d->d_name);
 609                 if (fname_len > PATH_MAX) {
 610                         xlog(L_WARNING, "Too long file name: %s in %s", d->d_name, dname);
 611                         continue;
 612                 }
 613
 614                 export_read(fname);
 615         }
 616
 617         for (i = 0; i < n; i++)
 618                 free(namelist[i]);
 619         free(namelist);
 620
 621         return;
 622 }
 623
 624 static char
 625 dumpopt(char c, char *fmt, ...)
 626 {
 627         va_list ap;
 628
 629         va_start(ap, fmt);
 630         printf("%c", c);
 631         vprintf(fmt, ap);
 632         va_end(ap);
 633         return ',';
 634 }
 635
 636 static void
 637 dump(int verbose)
 638 {
 639         nfs_export      *exp;
 640         struct exportent *ep;
 641         int             htype;
 642         char            *hname, c;
 643
 644         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 645                 for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 646                         ep = &exp->m_export;
 647                         if (!exp->m_xtabent)
 648                             continue; /* neilb */
 649                         if (htype == MCL_ANONYMOUS)
 650                                 hname = "<world>";
 651                         else
 652                                 hname = ep->e_hostname;
 653                         if (strlen(ep->e_path) > 14)
 654                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 655                         else
 656                                 printf("%-14s\t%s", ep->e_path, hname);
 657                         if (!verbose) {
 658                                 printf("\n");
 659                                 continue;
 660                         }
 661                         c = '(';
 662                         if (ep->e_flags & NFSEXP_READONLY)
 663                                 c = dumpopt(c, "ro");
 664                         else
 665                                 c = dumpopt(c, "rw");
 666                         if (ep->e_flags & NFSEXP_ASYNC)
 667                                 c = dumpopt(c, "async");
 668                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 669                                 c = dumpopt(c, "wdelay");
 670                         if (ep->e_flags & NFSEXP_NOHIDE)
 671                                 c = dumpopt(c, "nohide");
 672                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 673                                 c = dumpopt(c, "crossmnt");
 674                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 675                                 c = dumpopt(c, "insecure");
 676                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 677                                 c = dumpopt(c, "root_squash");
 678                         else
 679                                 c = dumpopt(c, "no_root_squash");
 680                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 681                                 c = dumpopt(c, "all_squash");
 682                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 683                                 c = dumpopt(c, "no_subtree_check");
 684                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 685                                 c = dumpopt(c, "insecure_locks");
 686                         if (ep->e_flags & NFSEXP_NOACL)
 687                                 c = dumpopt(c, "no_acl");
 688                         if (ep->e_flags & NFSEXP_FSID)
 689                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 690                         if (ep->e_uuid)
 691                                 c = dumpopt(c, "fsid=%s", ep->e_uuid);
 692                         if (ep->e_mountpoint)
 693                                 c = dumpopt(c, "mountpoint%s%s",
 694                                             ep->e_mountpoint[0]?"=":"",
 695                                             ep->e_mountpoint);
 696                         if (ep->e_anonuid != 65534)
 697                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 698                         if (ep->e_anongid != 65534)
 699                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 700                         switch(ep->e_fslocmethod) {
 701                         case FSLOC_NONE:
 702                                 break;
 703                         case FSLOC_REFER:
 704                                 c = dumpopt(c, "refer=%s", ep->e_fslocdata);
 705                                 break;
 706                         case FSLOC_REPLICA:
 707                                 c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
 708                                 break;
 709 #ifdef DEBUG
 710                         case FSLOC_STUB:
 711                                 c = dumpopt(c, "fsloc=stub");
 712                                 break;
 713 #endif
 714                         }
 715                         secinfo_show(stdout, ep);
 716                         printf("%c\n", (c != '(')? ')' : ' ');
 717                 }
 718         }
 719 }
 720
 721 static void
 722 error(nfs_export *exp, int err)
 723 {
 724         xlog(L_ERROR, "%s:%s: %s", exp->m_client->m_hostname,
 725                 exp->m_export.e_path, strerror(err));
 726 }
 727
 728 static void
 729 usage(const char *progname, int n)
 730 {
 731         fprintf(stderr, "usage: %s [-afhioruv] [host:/path]\n", progname);
 732         exit(n);
 733 }