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 #include "config.h"
  12
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <stdarg.h>
  16 #include <getopt.h>
  17 #include <netdb.h>
  18 #include <errno.h>
  19 #include "xmalloc.h"
  20 #include "misc.h"
  21 #include "nfslib.h"
  22 #include "exportfs.h"
  23 #include "xmalloc.h"
  24 #include "xlog.h"
  25
  26 static void     export_all(int verbose);
  27 static void     exportfs(char *arg, char *options, int verbose);
  28 static void     unexportfs(char *arg, int verbose);
  29 static void     exports_update(int verbose);
  30 static void     dump(int verbose);
  31 static void     error(nfs_export *exp, int err);
  32 static void     usage(void);
  33
  34
  35 int
  36 main(int argc, char **argv)
  37 {
  38         char    *options = NULL;
  39         int     f_export = 1;
  40         int     f_all = 0;
  41         int     f_verbose = 0;
  42         int     f_reexport = 0;
  43         int     f_ignore = 0;
  44         int     i, c;
  45         int     new_cache = 0;
  46         int     force_flush = 0;
  47
  48         xlog_open("exportfs");
  49
  50         export_errno = 0;
  51
  52         while ((c = getopt(argc, argv, "aio:ruvf")) != EOF) {
  53                 switch(c) {
  54                 case 'a':
  55                         f_all = 1;
  56                         break;
  57                 case 'i':
  58                         f_ignore = 1;
  59                         break;
  60                 case 'o':
  61                         options = optarg;
  62                         break;
  63                 case 'r':
  64                         f_reexport = 1;
  65                         f_all = 1;
  66                         break;
  67                 case 'u':
  68                         f_export = 0;
  69                         break;
  70                 case 'v':
  71                         f_verbose = 1;
  72                         break;
  73                 case 'f':
  74                         force_flush = 1;
  75                         break;
  76                 default:
  77                         usage();
  78                         break;
  79                 }
  80         }
  81
  82         if (optind != argc && f_all) {
  83                 fprintf(stderr,"exportfs: extra arguments are not permitted with -a or -r.\n");
  84                 return 1;
  85         }
  86         if (f_ignore && (f_all || ! f_export)) {
  87                 fprintf(stderr,"exportfs: -i not meaningful with -a, -r or -u.\n");
  88                 return 1;
  89         }
  90         if (f_reexport && ! f_export) {
  91                 fprintf(stderr, "exportfs: -r and -u are incompatible.\n");
  92                 return 1;
  93         }
  94         new_cache = check_new_cache();
  95         if (optind == argc && ! f_all) {
  96                 if (force_flush) {
  97                         if (new_cache)
  98                                 cache_flush(1);
  99                         else {
 100                                 fprintf(stderr, "exportfs: -f: only available with new cache controls: mount /proc/fs/nfsd first\n");
 101                                 exit(1);
 102                         }
 103                         return 0;
 104                 } else {
 105                         xtab_export_read();
 106                         dump(f_verbose);
 107                         return 0;
 108                 }
 109         }
 110
 111         if (f_export && ! f_ignore)
 112                 export_read(_PATH_EXPORTS);
 113         if (f_export) {
 114                 if (f_all)
 115                         export_all(f_verbose);
 116                 else
 117                         for (i = optind; i < argc ; i++)
 118                                 exportfs(argv[i], options, f_verbose);
 119         }
 120         /* If we are unexporting everything, then
 121          * don't care about what should be exported, as that
 122          * may require DNS lookups..
 123          */
 124         if (! ( !f_export && f_all)) {
 125                 /* note: xtab_*_read does not update entries if they already exist,
 126                  * so this will not lose new options
 127                  */
 128                 if (!f_reexport)
 129                         xtab_export_read();
 130                 if (!f_export)
 131                         for (i = optind ; i < argc ; i++)
 132                                 unexportfs(argv[i], f_verbose);
 133                 if (!new_cache)
 134                         rmtab_read();
 135         }
 136         if (!new_cache) {
 137                 xtab_mount_read();
 138                 exports_update(f_verbose);
 139         }
 140         xtab_export_write();
 141         if (new_cache)
 142                 cache_flush(force_flush);
 143         if (!new_cache)
 144                 xtab_mount_write();
 145
 146         return export_errno;
 147 }
 148
 149 static void
 150 exports_update_one(nfs_export *exp, int verbose)
 151 {
 152                 /* check mountpoint option */
 153         if (exp->m_mayexport &&
 154             exp->m_export.e_mountpoint &&
 155             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 156                            exp->m_export.e_mountpoint:
 157                            exp->m_export.e_path)) {
 158                 printf("%s not exported as %s not a mountpoint.\n",
 159                        exp->m_export.e_path, exp->m_export.e_mountpoint);
 160                 exp->m_mayexport = 0;
 161         }
 162         if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 163                 if (verbose)
 164                         printf("%sexporting %s:%s to kernel\n",
 165                                exp->m_exported ?"re":"",
 166                                exp->m_client->m_hostname,
 167                                exp->m_export.e_path);
 168                 if (!export_export(exp))
 169                         error(exp, errno);
 170         }
 171         if (exp->m_exported && ! exp->m_mayexport) {
 172                 if (verbose)
 173                         printf("unexporting %s:%s from kernel\n",
 174                                exp->m_client->m_hostname,
 175                                exp->m_export.e_path);
 176                 if (!export_unexport(exp))
 177                         error(exp, errno);
 178         }
 179 }
 180
 181
 182 /* we synchronise intention with reality.
 183  * entries with m_mayexport get exported
 184  * entries with m_exported but not m_mayexport get unexported
 185  * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
 186  */
 187 static void
 188 exports_update(int verbose)
 189 {
 190         nfs_export      *exp;
 191
 192         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 193                 exports_update_one(exp, verbose);
 194         }
 195         for (exp = exportlist[MCL_GSS]; exp; exp=exp->m_next) {
 196                 exports_update_one(exp, verbose);
 197         }
 198 }
 199
 200 /*
 201  * export_all finds all entries and
 202  *    marks them xtabent and mayexport so that they get exported
 203  */
 204 static void
 205 export_all(int verbose)
 206 {
 207         nfs_export      *exp;
 208         int             i;
 209
 210         for (i = 0; i < MCL_MAXTYPES; i++) {
 211                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 212                         if (verbose)
 213                                 printf("exporting %s:%s\n",
 214                                        exp->m_client->m_hostname,
 215                                        exp->m_export.e_path);
 216                         exp->m_xtabent = 1;
 217                         exp->m_mayexport = 1;
 218                         exp->m_changed = 1;
 219                 }
 220         }
 221 }
 222
 223
 224 static void
 225 exportfs(char *arg, char *options, int verbose)
 226 {
 227         struct exportent *eep;
 228         nfs_export      *exp;
 229         struct hostent  *hp = NULL;
 230         char            *path;
 231         char            *hname = arg;
 232         int             htype;
 233
 234         if ((path = strchr(arg, ':')) != NULL)
 235                 *path++ = '\0';
 236
 237         if (!path || *path != '/') {
 238                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 239                 return;
 240         }
 241
 242         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 243             (hp = gethostbyname(hname)) != NULL) {
 244                 struct hostent *hp2 = hostent_dup (hp);
 245                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 246                                    hp2->h_addrtype);
 247                 if (hp) {
 248                         free(hp2);
 249                         hp = hostent_dup(hp);
 250                 } else
 251                         hp = hp2;
 252                 exp = export_find(hp, path);
 253                 hname = hp->h_name;
 254         } else {
 255                 exp = export_lookup(hname, path, 0);
 256         }
 257
 258         if (!exp) {
 259                 if (!(eep = mkexportent(hname, path, options)) ||
 260                     !(exp = export_create(eep, 0))) {
 261                         if (hp) free (hp);
 262                         return;
 263                 }
 264         } else if (!updateexportent(&exp->m_export, options)) {
 265                 if (hp) free (hp);
 266                 return;
 267         }
 268
 269         if (verbose)
 270                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 271                         exp->m_export.e_path);
 272         exp->m_xtabent = 1;
 273         exp->m_mayexport = 1;
 274         exp->m_changed = 1;
 275         if (hp) free (hp);
 276 }
 277
 278 static void
 279 unexportfs(char *arg, int verbose)
 280 {
 281         nfs_export      *exp;
 282         struct hostent  *hp = NULL;
 283         char            *path;
 284         char            *hname = arg;
 285         int             htype;
 286
 287         if ((path = strchr(arg, ':')) != NULL)
 288                 *path++ = '\0';
 289
 290         if (!path || *path != '/') {
 291                 fprintf(stderr, "Invalid unexporting option: %s\n",
 292                         arg);
 293                 return;
 294         }
 295
 296         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 297                 if ((hp = gethostbyname(hname)) != 0) {
 298                         hp = hostent_dup (hp);
 299                         hname = (char *) hp->h_name;
 300                 }
 301         }
 302
 303         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 304                 if (path && strcmp(path, exp->m_export.e_path))
 305                         continue;
 306                 if (htype != exp->m_client->m_type)
 307                         continue;
 308                 if (htype == MCL_FQDN
 309                     && !matchhostname(exp->m_export.e_hostname,
 310                                           hname))
 311                         continue;
 312                 if (htype != MCL_FQDN
 313                     && strcasecmp(exp->m_export.e_hostname, hname))
 314                         continue;
 315                 if (verbose) {
 316 #if 0
 317                         if (exp->m_exported) {
 318                                 printf("unexporting %s:%s from kernel\n",
 319                                        exp->m_client->m_hostname,
 320                                        exp->m_export.e_path);
 321                         }
 322                         else
 323 #endif
 324                                 printf("unexporting %s:%s\n",
 325                                         exp->m_client->m_hostname,
 326                                         exp->m_export.e_path);
 327                 }
 328 #if 0
 329                 if (exp->m_exported && !export_unexport(exp))
 330                         error(exp, errno);
 331 #endif
 332                 exp->m_xtabent = 0;
 333                 exp->m_mayexport = 0;
 334         }
 335
 336         if (hp) free (hp);
 337 }
 338
 339 static char
 340 dumpopt(char c, char *fmt, ...)
 341 {
 342         va_list ap;
 343
 344         va_start(ap, fmt);
 345         printf("%c", c);
 346         vprintf(fmt, ap);
 347         va_end(ap);
 348         return ',';
 349 }
 350
 351 static void
 352 dump(int verbose)
 353 {
 354         nfs_export      *exp;
 355         struct exportent *ep;
 356         int             htype;
 357         char            *hname, c;
 358
 359         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 360                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 361                         ep = &exp->m_export;
 362                         if (!exp->m_xtabent)
 363                             continue; /* neilb */
 364                         if (htype == MCL_ANONYMOUS)
 365                                 hname = "<world>";
 366                         else
 367                                 hname = ep->e_hostname;
 368                         if (strlen(ep->e_path) > 14)
 369                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 370                         else
 371                                 printf("%-14s\t%s", ep->e_path, hname);
 372                         if (!verbose) {
 373                                 printf("\n");
 374                                 continue;
 375                         }
 376                         c = '(';
 377                         if (ep->e_flags & NFSEXP_READONLY)
 378                                 c = dumpopt(c, "ro");
 379                         else
 380                                 c = dumpopt(c, "rw");
 381                         if (ep->e_flags & NFSEXP_ASYNC)
 382                                 c = dumpopt(c, "async");
 383                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 384                                 c = dumpopt(c, "wdelay");
 385                         if (ep->e_flags & NFSEXP_NOHIDE)
 386                                 c = dumpopt(c, "nohide");
 387                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 388                                 c = dumpopt(c, "crossmnt");
 389                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 390                                 c = dumpopt(c, "insecure");
 391                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 392                                 c = dumpopt(c, "root_squash");
 393                         else
 394                                 c = dumpopt(c, "no_root_squash");
 395                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 396                                 c = dumpopt(c, "all_squash");
 397                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 398                                 c = dumpopt(c, "no_subtree_check");
 399                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 400                                 c = dumpopt(c, "insecure_locks");
 401                         if (ep->e_flags & NFSEXP_NOACL)
 402                                 c = dumpopt(c, "no_acl");
 403                         if (ep->e_flags & NFSEXP_FSID)
 404                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 405                         if (ep->e_mountpoint)
 406                                 c = dumpopt(c, "mountpoint%s%s",
 407                                             ep->e_mountpoint[0]?"=":"",
 408                                             ep->e_mountpoint);
 409                         if (ep->e_maptype == CLE_MAP_UGIDD)
 410                                 c = dumpopt(c, "mapping=ugidd");
 411                         else if (ep->e_maptype == CLE_MAP_FILE)
 412                                 c = dumpopt(c, "mapping=file");
 413                         if (ep->e_anonuid != 65534)
 414                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 415                         if (ep->e_anongid != 65534)
 416                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 417
 418                         printf("%c\n", (c != '(')? ')' : ' ');
 419                 }
 420         }
 421 }
 422
 423 static void
 424 error(nfs_export *exp, int err)
 425 {
 426         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 427                 exp->m_export.e_path, strerror(err));
 428 }
 429
 430 static void
 431 usage(void)
 432 {
 433         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 434         exit(1);
 435 }