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 hostent  *hp = NULL;
 236         char            *path;
 237         char            *hname = arg;
 238         int             htype;
 239
 240         if ((path = strchr(arg, ':')) != NULL)
 241                 *path++ = '\0';
 242
 243         if (!path || *path != '/') {
 244                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 245                 return;
 246         }
 247
 248         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 249             (hp = gethostbyname(hname)) != NULL) {
 250                 struct hostent *hp2 = hostent_dup (hp);
 251                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 252                                    hp2->h_addrtype);
 253                 if (hp) {
 254                         free(hp2);
 255                         hp = hostent_dup(hp);
 256                 } else
 257                         hp = hp2;
 258                 exp = export_find(hp, path);
 259                 hname = hp->h_name;
 260         } else {
 261                 exp = export_lookup(hname, path, 0);
 262         }
 263
 264         if (!exp) {
 265                 if (!(eep = mkexportent(hname, path, options)) ||
 266                     !(exp = export_create(eep, 0)))
 267                         goto out;
 268         } else if (!updateexportent(&exp->m_export, options))
 269                 goto out;
 270
 271         if (verbose)
 272                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 273                         exp->m_export.e_path);
 274         exp->m_xtabent = 1;
 275         exp->m_mayexport = 1;
 276         exp->m_changed = 1;
 277         exp->m_warned = 0;
 278         validate_export(exp);
 279
 280 out:
 281         if (hp) free (hp);
 282 }
 283
 284 static void
 285 unexportfs(char *arg, int verbose)
 286 {
 287         nfs_export      *exp;
 288         struct addrinfo *ai = NULL;
 289         char            *path;
 290         char            *hname = arg;
 291         int             htype;
 292
 293         if ((path = strchr(arg, ':')) != NULL)
 294                 *path++ = '\0';
 295
 296         if (!path || *path != '/') {
 297                 fprintf(stderr, "Invalid unexporting option: %s\n",
 298                         arg);
 299                 return;
 300         }
 301
 302         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 303                 ai = host_addrinfo(hname);
 304                 if (ai)
 305                         hname = ai->ai_canonname;
 306         }
 307
 308         for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 309                 if (path && strcmp(path, exp->m_export.e_path))
 310                         continue;
 311                 if (htype != exp->m_client->m_type)
 312                         continue;
 313                 if (htype == MCL_FQDN
 314                     && !matchhostname(exp->m_export.e_hostname,
 315                                           hname))
 316                         continue;
 317                 if (htype != MCL_FQDN
 318                     && strcasecmp(exp->m_export.e_hostname, hname))
 319                         continue;
 320                 if (verbose) {
 321 #if 0
 322                         if (exp->m_exported) {
 323                                 printf("unexporting %s:%s from kernel\n",
 324                                        exp->m_client->m_hostname,
 325                                        exp->m_export.e_path);
 326                         }
 327                         else
 328 #endif
 329                                 printf("unexporting %s:%s\n",
 330                                         exp->m_client->m_hostname,
 331                                         exp->m_export.e_path);
 332                 }
 333 #if 0
 334                 if (exp->m_exported && !export_unexport(exp))
 335                         error(exp, errno);
 336 #endif
 337                 exp->m_xtabent = 0;
 338                 exp->m_mayexport = 0;
 339         }
 340
 341         freeaddrinfo(ai);
 342 }
 343
 344 static int can_test(void)
 345 {
 346         int fd;
 347         int n;
 348         char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
 349         fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
 350         if ( fd < 0) return 0;
 351         n = write(fd, setup, strlen(setup));
 352         close(fd);
 353         if (n < 0)
 354                 return 0;
 355         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 356         if ( fd < 0) return 0;
 357         close(fd);
 358         return 1;
 359 }
 360
 361 static int test_export(char *path, int with_fsid)
 362 {
 363         char buf[1024];
 364         int fd, n;
 365
 366         sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
 367                 path,
 368                 with_fsid ? NFSEXP_FSID : 0);
 369         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 370         if (fd < 0)
 371                 return 0;
 372         n = write(fd, buf, strlen(buf));
 373         close(fd);
 374         if (n < 0)
 375                 return 0;
 376         return 1;
 377 }
 378
 379 static void
 380 validate_export(nfs_export *exp)
 381 {
 382         /* Check that the given export point is potentially exportable.
 383          * We just give warnings here, don't cause anything to fail.
 384          * If a path doesn't exist, or is not a dir or file, give an warning
 385          * otherwise trial-export to '-test-client-' and check for failure.
 386          */
 387         struct stat stb;
 388         char *path = exp->m_export.e_path;
 389         struct statfs64 stf;
 390         int fs_has_fsid = 0;
 391
 392         if (stat(path, &stb) < 0) {
 393                 fprintf(stderr, "exportfs: Warning: %s does not exist\n",
 394                         path);
 395                 return;
 396         }
 397         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 398                 fprintf(stderr, "exportfs: Warning: %s is neither "
 399                         "a directory nor a file.\n"
 400                         "     remote access will fail\n", path);
 401                 return;
 402         }
 403         if (!can_test())
 404                 return;
 405
 406         if (!statfs64(path, &stf) &&
 407             (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
 408                 fs_has_fsid = 1;
 409
 410         if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
 411             fs_has_fsid) {
 412                 if ( !test_export(path, 1)) {
 413                         fprintf(stderr, "exportfs: Warning: %s does not "
 414                                 "support NFS export.\n",
 415                                 path);
 416                         return;
 417                 }
 418         } else if ( ! test_export(path, 0)) {
 419                 if (test_export(path, 1))
 420                         fprintf(stderr, "exportfs: Warning: %s requires fsid= "
 421                                 "for NFS export\n", path);
 422                 else
 423                         fprintf(stderr, "exportfs: Warning: %s does not "
 424                                 "support NFS export.\n",
 425                                 path);
 426                 return;
 427
 428         }
 429 }
 430
 431
 432 static char
 433 dumpopt(char c, char *fmt, ...)
 434 {
 435         va_list ap;
 436
 437         va_start(ap, fmt);
 438         printf("%c", c);
 439         vprintf(fmt, ap);
 440         va_end(ap);
 441         return ',';
 442 }
 443
 444 static void
 445 dump(int verbose)
 446 {
 447         nfs_export      *exp;
 448         struct exportent *ep;
 449         int             htype;
 450         char            *hname, c;
 451
 452         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 453                 for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 454                         ep = &exp->m_export;
 455                         if (!exp->m_xtabent)
 456                             continue; /* neilb */
 457                         if (htype == MCL_ANONYMOUS)
 458                                 hname = "<world>";
 459                         else
 460                                 hname = ep->e_hostname;
 461                         if (strlen(ep->e_path) > 14)
 462                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 463                         else
 464                                 printf("%-14s\t%s", ep->e_path, hname);
 465                         if (!verbose) {
 466                                 printf("\n");
 467                                 continue;
 468                         }
 469                         c = '(';
 470                         if (ep->e_flags & NFSEXP_READONLY)
 471                                 c = dumpopt(c, "ro");
 472                         else
 473                                 c = dumpopt(c, "rw");
 474                         if (ep->e_flags & NFSEXP_ASYNC)
 475                                 c = dumpopt(c, "async");
 476                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 477                                 c = dumpopt(c, "wdelay");
 478                         if (ep->e_flags & NFSEXP_NOHIDE)
 479                                 c = dumpopt(c, "nohide");
 480                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 481                                 c = dumpopt(c, "crossmnt");
 482                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 483                                 c = dumpopt(c, "insecure");
 484                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 485                                 c = dumpopt(c, "root_squash");
 486                         else
 487                                 c = dumpopt(c, "no_root_squash");
 488                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 489                                 c = dumpopt(c, "all_squash");
 490                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 491                                 c = dumpopt(c, "no_subtree_check");
 492                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 493                                 c = dumpopt(c, "insecure_locks");
 494                         if (ep->e_flags & NFSEXP_NOACL)
 495                                 c = dumpopt(c, "no_acl");
 496                         if (ep->e_flags & NFSEXP_FSID)
 497                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 498                         if (ep->e_uuid)
 499                                 c = dumpopt(c, "fsid=%s", ep->e_uuid);
 500                         if (ep->e_mountpoint)
 501                                 c = dumpopt(c, "mountpoint%s%s",
 502                                             ep->e_mountpoint[0]?"=":"",
 503                                             ep->e_mountpoint);
 504                         if (ep->e_anonuid != 65534)
 505                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 506                         if (ep->e_anongid != 65534)
 507                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 508                         switch(ep->e_fslocmethod) {
 509                         case FSLOC_NONE:
 510                                 break;
 511                         case FSLOC_REFER:
 512                                 c = dumpopt(c, "refer=%s", ep->e_fslocdata);
 513                                 break;
 514                         case FSLOC_REPLICA:
 515                                 c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
 516                                 break;
 517 #ifdef DEBUG
 518                         case FSLOC_STUB:
 519                                 c = dumpopt(c, "fsloc=stub");
 520                                 break;
 521 #endif
 522                         }
 523                         secinfo_show(stdout, ep);
 524                         printf("%c\n", (c != '(')? ')' : ' ');
 525                 }
 526         }
 527 }
 528
 529 static void
 530 error(nfs_export *exp, int err)
 531 {
 532         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 533                 exp->m_export.e_path, strerror(err));
 534 }
 535
 536 static void
 537 usage(void)
 538 {
 539         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 540         exit(1);
 541 }