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 <stdlib.h>
  16 #include <string.h>
  17 #include <stdarg.h>
  18 #include <getopt.h>
  19 #include <netdb.h>
  20 #include <errno.h>
  21 #include "xmalloc.h"
  22 #include "misc.h"
  23 #include "nfslib.h"
  24 #include "exportfs.h"
  25 #include "xmalloc.h"
  26 #include "xlog.h"
  27
  28 static void     export_all(int verbose);
  29 static void     exportfs(char *arg, char *options, int verbose);
  30 static void     unexportfs(char *arg, int verbose);
  31 static void     exports_update(int verbose);
  32 static void     dump(int verbose);
  33 static void     error(nfs_export *exp, int err);
  34 static void     usage(void);
  35
  36
  37 int
  38 main(int argc, char **argv)
  39 {
  40         char    *options = NULL;
  41         int     f_export = 1;
  42         int     f_all = 0;
  43         int     f_verbose = 0;
  44         int     f_reexport = 0;
  45         int     f_ignore = 0;
  46         int     i, c;
  47         int     new_cache = 0;
  48         int     force_flush = 0;
  49
  50         xlog_open("exportfs");
  51
  52         export_errno = 0;
  53
  54         while ((c = getopt(argc, argv, "aio:ruvf")) != EOF) {
  55                 switch(c) {
  56                 case 'a':
  57                         f_all = 1;
  58                         break;
  59                 case 'i':
  60                         f_ignore = 1;
  61                         break;
  62                 case 'o':
  63                         options = optarg;
  64                         break;
  65                 case 'r':
  66                         f_reexport = 1;
  67                         f_all = 1;
  68                         break;
  69                 case 'u':
  70                         f_export = 0;
  71                         break;
  72                 case 'v':
  73                         f_verbose = 1;
  74                         break;
  75                 case 'f':
  76                         force_flush = 1;
  77                         break;
  78                 default:
  79                         usage();
  80                         break;
  81                 }
  82         }
  83
  84         if (optind != argc && f_all) {
  85                 fprintf(stderr,"exportfs: extra arguments are not permitted with -a or -r.\n");
  86                 return 1;
  87         }
  88         if (f_ignore && (f_all || ! f_export)) {
  89                 fprintf(stderr,"exportfs: -i not meaningful with -a, -r or -u.\n");
  90                 return 1;
  91         }
  92         if (f_reexport && ! f_export) {
  93                 fprintf(stderr, "exportfs: -r and -u are incompatible.\n");
  94                 return 1;
  95         }
  96         new_cache = check_new_cache();
  97         if (optind == argc && ! f_all) {
  98                 if (force_flush) {
  99                         if (new_cache)
 100                                 cache_flush(1);
 101                         else {
 102                                 fprintf(stderr, "exportfs: -f: only available with new cache controls: mount /proc/fs/nfsd first\n");
 103                                 exit(1);
 104                         }
 105                         return 0;
 106                 } else {
 107                         xtab_export_read();
 108                         dump(f_verbose);
 109                         return 0;
 110                 }
 111         }
 112
 113         if (f_export && ! f_ignore)
 114                 export_read(_PATH_EXPORTS);
 115         if (f_export) {
 116                 if (f_all)
 117                         export_all(f_verbose);
 118                 else
 119                         for (i = optind; i < argc ; i++)
 120                                 exportfs(argv[i], options, f_verbose);
 121         }
 122         /* If we are unexporting everything, then
 123          * don't care about what should be exported, as that
 124          * may require DNS lookups..
 125          */
 126         if (! ( !f_export && f_all)) {
 127                 /* note: xtab_*_read does not update entries if they already exist,
 128                  * so this will not lose new options
 129                  */
 130                 if (!f_reexport)
 131                         xtab_export_read();
 132                 if (!f_export)
 133                         for (i = optind ; i < argc ; i++)
 134                                 unexportfs(argv[i], f_verbose);
 135                 if (!new_cache)
 136                         rmtab_read();
 137         }
 138         if (!new_cache) {
 139                 xtab_mount_read();
 140                 exports_update(f_verbose);
 141         }
 142         xtab_export_write();
 143         if (new_cache)
 144                 cache_flush(force_flush);
 145         if (!new_cache)
 146                 xtab_mount_write();
 147
 148         return export_errno;
 149 }
 150
 151 static void
 152 exports_update_one(nfs_export *exp, int verbose)
 153 {
 154                 /* check mountpoint option */
 155         if (exp->m_mayexport &&
 156             exp->m_export.e_mountpoint &&
 157             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 158                            exp->m_export.e_mountpoint:
 159                            exp->m_export.e_path)) {
 160                 printf("%s not exported as %s not a mountpoint.\n",
 161                        exp->m_export.e_path, exp->m_export.e_mountpoint);
 162                 exp->m_mayexport = 0;
 163         }
 164         if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 165                 if (verbose)
 166                         printf("%sexporting %s:%s to kernel\n",
 167                                exp->m_exported ?"re":"",
 168                                exp->m_client->m_hostname,
 169                                exp->m_export.e_path);
 170                 if (!export_export(exp))
 171                         error(exp, errno);
 172         }
 173         if (exp->m_exported && ! exp->m_mayexport) {
 174                 if (verbose)
 175                         printf("unexporting %s:%s from kernel\n",
 176                                exp->m_client->m_hostname,
 177                                exp->m_export.e_path);
 178                 if (!export_unexport(exp))
 179                         error(exp, errno);
 180         }
 181 }
 182
 183
 184 /* we synchronise intention with reality.
 185  * entries with m_mayexport get exported
 186  * entries with m_exported but not m_mayexport get unexported
 187  * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
 188  */
 189 static void
 190 exports_update(int verbose)
 191 {
 192         nfs_export      *exp;
 193
 194         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 195                 exports_update_one(exp, verbose);
 196         }
 197         for (exp = exportlist[MCL_GSS]; exp; exp=exp->m_next) {
 198                 exports_update_one(exp, verbose);
 199         }
 200 }
 201
 202 /*
 203  * export_all finds all entries and
 204  *    marks them xtabent and mayexport so that they get exported
 205  */
 206 static void
 207 export_all(int verbose)
 208 {
 209         nfs_export      *exp;
 210         int             i;
 211
 212         for (i = 0; i < MCL_MAXTYPES; i++) {
 213                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 214                         if (verbose)
 215                                 printf("exporting %s:%s\n",
 216                                        exp->m_client->m_hostname,
 217                                        exp->m_export.e_path);
 218                         exp->m_xtabent = 1;
 219                         exp->m_mayexport = 1;
 220                         exp->m_changed = 1;
 221                 }
 222         }
 223 }
 224
 225
 226 static void
 227 exportfs(char *arg, char *options, int verbose)
 228 {
 229         struct exportent *eep;
 230         nfs_export      *exp;
 231         struct hostent  *hp = NULL;
 232         char            *path;
 233         char            *hname = arg;
 234         int             htype;
 235
 236         if ((path = strchr(arg, ':')) != NULL)
 237                 *path++ = '\0';
 238
 239         if (!path || *path != '/') {
 240                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 241                 return;
 242         }
 243
 244         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 245             (hp = gethostbyname(hname)) != NULL) {
 246                 struct hostent *hp2 = hostent_dup (hp);
 247                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 248                                    hp2->h_addrtype);
 249                 if (hp) {
 250                         free(hp2);
 251                         hp = hostent_dup(hp);
 252                 } else
 253                         hp = hp2;
 254                 exp = export_find(hp, path);
 255                 hname = hp->h_name;
 256         } else {
 257                 exp = export_lookup(hname, path, 0);
 258         }
 259
 260         if (!exp) {
 261                 if (!(eep = mkexportent(hname, path, options)) ||
 262                     !(exp = export_create(eep, 0))) {
 263                         if (hp) free (hp);
 264                         return;
 265                 }
 266         } else if (!updateexportent(&exp->m_export, options)) {
 267                 if (hp) free (hp);
 268                 return;
 269         }
 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         if (hp) free (hp);
 278 }
 279
 280 static void
 281 unexportfs(char *arg, int verbose)
 282 {
 283         nfs_export      *exp;
 284         struct hostent  *hp = NULL;
 285         char            *path;
 286         char            *hname = arg;
 287         int             htype;
 288
 289         if ((path = strchr(arg, ':')) != NULL)
 290                 *path++ = '\0';
 291
 292         if (!path || *path != '/') {
 293                 fprintf(stderr, "Invalid unexporting option: %s\n",
 294                         arg);
 295                 return;
 296         }
 297
 298         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 299                 if ((hp = gethostbyname(hname)) != 0) {
 300                         hp = hostent_dup (hp);
 301                         hname = (char *) hp->h_name;
 302                 }
 303         }
 304
 305         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 306                 if (path && strcmp(path, exp->m_export.e_path))
 307                         continue;
 308                 if (htype != exp->m_client->m_type)
 309                         continue;
 310                 if (htype == MCL_FQDN
 311                     && !matchhostname(exp->m_export.e_hostname,
 312                                           hname))
 313                         continue;
 314                 if (htype != MCL_FQDN
 315                     && strcasecmp(exp->m_export.e_hostname, hname))
 316                         continue;
 317                 if (verbose) {
 318 #if 0
 319                         if (exp->m_exported) {
 320                                 printf("unexporting %s:%s from kernel\n",
 321                                        exp->m_client->m_hostname,
 322                                        exp->m_export.e_path);
 323                         }
 324                         else
 325 #endif
 326                                 printf("unexporting %s:%s\n",
 327                                         exp->m_client->m_hostname,
 328                                         exp->m_export.e_path);
 329                 }
 330 #if 0
 331                 if (exp->m_exported && !export_unexport(exp))
 332                         error(exp, errno);
 333 #endif
 334                 exp->m_xtabent = 0;
 335                 exp->m_mayexport = 0;
 336         }
 337
 338         if (hp) free (hp);
 339 }
 340
 341 static char
 342 dumpopt(char c, char *fmt, ...)
 343 {
 344         va_list ap;
 345
 346         va_start(ap, fmt);
 347         printf("%c", c);
 348         vprintf(fmt, ap);
 349         va_end(ap);
 350         return ',';
 351 }
 352
 353 static void
 354 dump(int verbose)
 355 {
 356         nfs_export      *exp;
 357         struct exportent *ep;
 358         int             htype;
 359         char            *hname, c;
 360
 361         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 362                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 363                         ep = &exp->m_export;
 364                         if (!exp->m_xtabent)
 365                             continue; /* neilb */
 366                         if (htype == MCL_ANONYMOUS)
 367                                 hname = "<world>";
 368                         else
 369                                 hname = ep->e_hostname;
 370                         if (strlen(ep->e_path) > 14)
 371                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 372                         else
 373                                 printf("%-14s\t%s", ep->e_path, hname);
 374                         if (!verbose) {
 375                                 printf("\n");
 376                                 continue;
 377                         }
 378                         c = '(';
 379                         if (ep->e_flags & NFSEXP_READONLY)
 380                                 c = dumpopt(c, "ro");
 381                         else
 382                                 c = dumpopt(c, "rw");
 383                         if (ep->e_flags & NFSEXP_ASYNC)
 384                                 c = dumpopt(c, "async");
 385                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 386                                 c = dumpopt(c, "wdelay");
 387                         if (ep->e_flags & NFSEXP_NOHIDE)
 388                                 c = dumpopt(c, "nohide");
 389                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 390                                 c = dumpopt(c, "crossmnt");
 391                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 392                                 c = dumpopt(c, "insecure");
 393                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 394                                 c = dumpopt(c, "root_squash");
 395                         else
 396                                 c = dumpopt(c, "no_root_squash");
 397                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 398                                 c = dumpopt(c, "all_squash");
 399                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 400                                 c = dumpopt(c, "no_subtree_check");
 401                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 402                                 c = dumpopt(c, "insecure_locks");
 403                         if (ep->e_flags & NFSEXP_NOACL)
 404                                 c = dumpopt(c, "no_acl");
 405                         if (ep->e_flags & NFSEXP_FSID)
 406                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 407                         if (ep->e_mountpoint)
 408                                 c = dumpopt(c, "mountpoint%s%s",
 409                                             ep->e_mountpoint[0]?"=":"",
 410                                             ep->e_mountpoint);
 411                         if (ep->e_maptype == CLE_MAP_UGIDD)
 412                                 c = dumpopt(c, "mapping=ugidd");
 413                         else if (ep->e_maptype == CLE_MAP_FILE)
 414                                 c = dumpopt(c, "mapping=file");
 415                         if (ep->e_anonuid != -2)
 416                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 417                         if (ep->e_anongid != -2)
 418                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 419
 420                         printf("%c\n", (c != '(')? ')' : ' ');
 421                 }
 422         }
 423 }
 424
 425 static void
 426 error(nfs_export *exp, int err)
 427 {
 428         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 429                 exp->m_export.e_path, strerror(err));
 430 }
 431
 432 static void
 433 usage(void)
 434 {
 435         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 436         exit(1);
 437 }