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 <sys/stat.h>
  17 #include <unistd.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <stdarg.h>
  21 #include <getopt.h>
  22 #include <netdb.h>
  23 #include <errno.h>
  24 #include "xmalloc.h"
  25 #include "misc.h"
  26 #include "nfslib.h"
  27 #include "exportfs.h"
  28 #include "xmalloc.h"
  29 #include "xlog.h"
  30
  31 static void     export_all(int verbose);
  32 static void     exportfs(char *arg, char *options, int verbose);
  33 static void     unexportfs(char *arg, int verbose);
  34 static void     exports_update(int verbose);
  35 static void     dump(int verbose);
  36 static void     error(nfs_export *exp, int err);
  37 static void     usage(void);
  38 static void     validate_export(nfs_export *exp);
  39
  40 int
  41 main(int argc, char **argv)
  42 {
  43         char    *options = NULL;
  44         int     f_export = 1;
  45         int     f_all = 0;
  46         int     f_verbose = 0;
  47         int     f_reexport = 0;
  48         int     f_ignore = 0;
  49         int     i, c;
  50         int     new_cache = 0;
  51         int     force_flush = 0;
  52
  53         xlog_open("exportfs");
  54
  55         export_errno = 0;
  56
  57         while ((c = getopt(argc, argv, "aio:ruvf")) != EOF) {
  58                 switch(c) {
  59                 case 'a':
  60                         f_all = 1;
  61                         break;
  62                 case 'i':
  63                         f_ignore = 1;
  64                         break;
  65                 case 'o':
  66                         options = optarg;
  67                         break;
  68                 case 'r':
  69                         f_reexport = 1;
  70                         f_all = 1;
  71                         break;
  72                 case 'u':
  73                         f_export = 0;
  74                         break;
  75                 case 'v':
  76                         f_verbose = 1;
  77                         break;
  78                 case 'f':
  79                         force_flush = 1;
  80                         break;
  81                 default:
  82                         usage();
  83                         break;
  84                 }
  85         }
  86
  87         if (optind != argc && f_all) {
  88                 fprintf(stderr,"exportfs: extra arguments are not permitted with -a or -r.\n");
  89                 return 1;
  90         }
  91         if (f_ignore && (f_all || ! f_export)) {
  92                 fprintf(stderr,"exportfs: -i not meaningful with -a, -r or -u.\n");
  93                 return 1;
  94         }
  95         if (f_reexport && ! f_export) {
  96                 fprintf(stderr, "exportfs: -r and -u are incompatible.\n");
  97                 return 1;
  98         }
  99         new_cache = check_new_cache();
 100         if (optind == argc && ! f_all) {
 101                 if (force_flush) {
 102                         if (new_cache)
 103                                 cache_flush(1);
 104                         else {
 105                                 fprintf(stderr, "exportfs: -f: only available with new cache controls: mount /proc/fs/nfsd first\n");
 106                                 exit(1);
 107                         }
 108                         return 0;
 109                 } else {
 110                         xtab_export_read();
 111                         dump(f_verbose);
 112                         return 0;
 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].p_head; exp; exp=exp->m_next) {
 197                 exports_update_one(exp, verbose);
 198         }
 199         for (exp = exportlist[MCL_GSS].p_head; 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].p_head; 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 addrinfo *ai = 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                 ai = host_addrinfo(hname);
 250                 if (ai != NULL) {
 251                         exp = export_find(ai, path);
 252                         hname = ai->ai_canonname;
 253                 }
 254         } else
 255                 exp = export_lookup(hname, path, 0);
 256
 257         if (!exp) {
 258                 if (!(eep = mkexportent(hname, path, options)) ||
 259                     !(exp = export_create(eep, 0)))
 260                         goto out;
 261         } else if (!updateexportent(&exp->m_export, options))
 262                 goto out;
 263
 264         if (verbose)
 265                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 266                         exp->m_export.e_path);
 267         exp->m_xtabent = 1;
 268         exp->m_mayexport = 1;
 269         exp->m_changed = 1;
 270         exp->m_warned = 0;
 271         validate_export(exp);
 272
 273 out:
 274         freeaddrinfo(ai);
 275 }
 276
 277 static void
 278 unexportfs(char *arg, int verbose)
 279 {
 280         nfs_export      *exp;
 281         struct addrinfo *ai = NULL;
 282         char            *path;
 283         char            *hname = arg;
 284         int             htype;
 285
 286         if ((path = strchr(arg, ':')) != NULL)
 287                 *path++ = '\0';
 288
 289         if (!path || *path != '/') {
 290                 fprintf(stderr, "Invalid unexporting option: %s\n",
 291                         arg);
 292                 return;
 293         }
 294
 295         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 296                 ai = host_addrinfo(hname);
 297                 if (ai)
 298                         hname = ai->ai_canonname;
 299         }
 300
 301         for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 302                 if (path && strcmp(path, exp->m_export.e_path))
 303                         continue;
 304                 if (htype != exp->m_client->m_type)
 305                         continue;
 306                 if (htype == MCL_FQDN
 307                     && !matchhostname(exp->m_export.e_hostname,
 308                                           hname))
 309                         continue;
 310                 if (htype != MCL_FQDN
 311                     && strcasecmp(exp->m_export.e_hostname, hname))
 312                         continue;
 313                 if (verbose) {
 314 #if 0
 315                         if (exp->m_exported) {
 316                                 printf("unexporting %s:%s from kernel\n",
 317                                        exp->m_client->m_hostname,
 318                                        exp->m_export.e_path);
 319                         }
 320                         else
 321 #endif
 322                                 printf("unexporting %s:%s\n",
 323                                         exp->m_client->m_hostname,
 324                                         exp->m_export.e_path);
 325                 }
 326 #if 0
 327                 if (exp->m_exported && !export_unexport(exp))
 328                         error(exp, errno);
 329 #endif
 330                 exp->m_xtabent = 0;
 331                 exp->m_mayexport = 0;
 332         }
 333
 334         freeaddrinfo(ai);
 335 }
 336
 337 static int can_test(void)
 338 {
 339         int fd;
 340         int n;
 341         char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
 342         fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
 343         if ( fd < 0) return 0;
 344         n = write(fd, setup, strlen(setup));
 345         close(fd);
 346         if (n < 0)
 347                 return 0;
 348         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 349         if ( fd < 0) return 0;
 350         close(fd);
 351         return 1;
 352 }
 353
 354 static int test_export(char *path, int with_fsid)
 355 {
 356         char buf[1024];
 357         int fd, n;
 358
 359         sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
 360                 path,
 361                 with_fsid ? NFSEXP_FSID : 0);
 362         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 363         if (fd < 0)
 364                 return 0;
 365         n = write(fd, buf, strlen(buf));
 366         close(fd);
 367         if (n < 0)
 368                 return 0;
 369         return 1;
 370 }
 371
 372 static void
 373 validate_export(nfs_export *exp)
 374 {
 375         /* Check that the given export point is potentially exportable.
 376          * We just give warnings here, don't cause anything to fail.
 377          * If a path doesn't exist, or is not a dir or file, give an warning
 378          * otherwise trial-export to '-test-client-' and check for failure.
 379          */
 380         struct stat stb;
 381         char *path = exp->m_export.e_path;
 382         struct statfs64 stf;
 383         int fs_has_fsid = 0;
 384
 385         if (stat(path, &stb) < 0) {
 386                 fprintf(stderr, "exportfs: Warning: %s does not exist\n",
 387                         path);
 388                 return;
 389         }
 390         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 391                 fprintf(stderr, "exportfs: Warning: %s is neither "
 392                         "a directory nor a file.\n"
 393                         "     remote access will fail\n", path);
 394                 return;
 395         }
 396         if (!can_test())
 397                 return;
 398
 399         if (!statfs64(path, &stf) &&
 400             (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
 401                 fs_has_fsid = 1;
 402
 403         if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
 404             fs_has_fsid) {
 405                 if ( !test_export(path, 1)) {
 406                         fprintf(stderr, "exportfs: Warning: %s does not "
 407                                 "support NFS export.\n",
 408                                 path);
 409                         return;
 410                 }
 411         } else if ( ! test_export(path, 0)) {
 412                 if (test_export(path, 1))
 413                         fprintf(stderr, "exportfs: Warning: %s requires fsid= "
 414                                 "for NFS export\n", path);
 415                 else
 416                         fprintf(stderr, "exportfs: Warning: %s does not "
 417                                 "support NFS export.\n",
 418                                 path);
 419                 return;
 420
 421         }
 422 }
 423
 424
 425 static char
 426 dumpopt(char c, char *fmt, ...)
 427 {
 428         va_list ap;
 429
 430         va_start(ap, fmt);
 431         printf("%c", c);
 432         vprintf(fmt, ap);
 433         va_end(ap);
 434         return ',';
 435 }
 436
 437 static void
 438 dump(int verbose)
 439 {
 440         nfs_export      *exp;
 441         struct exportent *ep;
 442         int             htype;
 443         char            *hname, c;
 444
 445         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 446                 for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 447                         ep = &exp->m_export;
 448                         if (!exp->m_xtabent)
 449                             continue; /* neilb */
 450                         if (htype == MCL_ANONYMOUS)
 451                                 hname = "<world>";
 452                         else
 453                                 hname = ep->e_hostname;
 454                         if (strlen(ep->e_path) > 14)
 455                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 456                         else
 457                                 printf("%-14s\t%s", ep->e_path, hname);
 458                         if (!verbose) {
 459                                 printf("\n");
 460                                 continue;
 461                         }
 462                         c = '(';
 463                         if (ep->e_flags & NFSEXP_READONLY)
 464                                 c = dumpopt(c, "ro");
 465                         else
 466                                 c = dumpopt(c, "rw");
 467                         if (ep->e_flags & NFSEXP_ASYNC)
 468                                 c = dumpopt(c, "async");
 469                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 470                                 c = dumpopt(c, "wdelay");
 471                         if (ep->e_flags & NFSEXP_NOHIDE)
 472                                 c = dumpopt(c, "nohide");
 473                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 474                                 c = dumpopt(c, "crossmnt");
 475                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 476                                 c = dumpopt(c, "insecure");
 477                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 478                                 c = dumpopt(c, "root_squash");
 479                         else
 480                                 c = dumpopt(c, "no_root_squash");
 481                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 482                                 c = dumpopt(c, "all_squash");
 483                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 484                                 c = dumpopt(c, "no_subtree_check");
 485                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 486                                 c = dumpopt(c, "insecure_locks");
 487                         if (ep->e_flags & NFSEXP_NOACL)
 488                                 c = dumpopt(c, "no_acl");
 489                         if (ep->e_flags & NFSEXP_FSID)
 490                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 491                         if (ep->e_uuid)
 492                                 c = dumpopt(c, "fsid=%s", ep->e_uuid);
 493                         if (ep->e_mountpoint)
 494                                 c = dumpopt(c, "mountpoint%s%s",
 495                                             ep->e_mountpoint[0]?"=":"",
 496                                             ep->e_mountpoint);
 497                         if (ep->e_anonuid != 65534)
 498                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 499                         if (ep->e_anongid != 65534)
 500                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 501                         switch(ep->e_fslocmethod) {
 502                         case FSLOC_NONE:
 503                                 break;
 504                         case FSLOC_REFER:
 505                                 c = dumpopt(c, "refer=%s", ep->e_fslocdata);
 506                                 break;
 507                         case FSLOC_REPLICA:
 508                                 c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
 509                                 break;
 510 #ifdef DEBUG
 511                         case FSLOC_STUB:
 512                                 c = dumpopt(c, "fsloc=stub");
 513                                 break;
 514 #endif
 515                         }
 516                         secinfo_show(stdout, ep);
 517                         printf("%c\n", (c != '(')? ')' : ' ');
 518                 }
 519         }
 520 }
 521
 522 static void
 523 error(nfs_export *exp, int err)
 524 {
 525         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 526                 exp->m_export.e_path, strerror(err));
 527 }
 528
 529 static void
 530 usage(void)
 531 {
 532         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 533         exit(1);
 534 }