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