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                 rmtab_read();
 134         }
 135         if (!new_cache) {
 136                 xtab_mount_read();
 137                 exports_update(f_verbose);
 138         }
 139         xtab_export_write();
 140         if (new_cache)
 141                 cache_flush(force_flush);
 142         if (!new_cache)
 143                 xtab_mount_write();
 144
 145         return export_errno;
 146 }
 147
 148 /* we synchronise intention with reality.
 149  * entries with m_mayexport get exported
 150  * entries with m_exported but not m_mayexport get unexported
 151  * looking at m_client->m_type == MCL_FQDN only
 152  */
 153 static void
 154 exports_update(int verbose)
 155 {
 156         nfs_export      *exp;
 157
 158         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 159                 /* check mountpoint option */
 160                 if (exp->m_mayexport &&
 161                     exp->m_export.e_mountpoint &&
 162                     !is_mountpoint(exp->m_export.e_mountpoint[0]?
 163                                    exp->m_export.e_mountpoint:
 164                                    exp->m_export.e_path)) {
 165                         printf("%s not exported as %s not a mountpoint.\n",
 166                                exp->m_export.e_path, exp->m_export.e_mountpoint);
 167                         exp->m_mayexport = 0;
 168                 }
 169                 if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 170                         if (verbose)
 171                                 printf("%sexporting %s:%s to kernel\n",
 172                                        exp->m_exported ?"re":"",
 173                                        exp->m_client->m_hostname,
 174                                        exp->m_export.e_path);
 175                         if (!export_export(exp))
 176                                 error(exp, errno);
 177                 }
 178                 if (exp->m_exported && ! exp->m_mayexport) {
 179                         if (verbose)
 180                                 printf("unexporting %s:%s from kernel\n",
 181                                        exp->m_client->m_hostname,
 182                                        exp->m_export.e_path);
 183                         if (!export_unexport(exp))
 184                                 error(exp, errno);
 185                 }
 186         }
 187 }
 188
 189 /*
 190  * export_all finds all entries and
 191  *    marks them xtabent and mayexport so that they get exported
 192  */
 193 static void
 194 export_all(int verbose)
 195 {
 196         nfs_export      *exp;
 197         int             i;
 198
 199         for (i = 0; i < MCL_MAXTYPES; i++) {
 200                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 201                         if (verbose)
 202                                 printf("exporting %s:%s\n",
 203                                        exp->m_client->m_hostname,
 204                                        exp->m_export.e_path);
 205                         exp->m_xtabent = 1;
 206                         exp->m_mayexport = 1;
 207                         exp->m_changed = 1;
 208                 }
 209         }
 210 }
 211
 212
 213 static void
 214 exportfs(char *arg, char *options, int verbose)
 215 {
 216         struct exportent *eep;
 217         nfs_export      *exp;
 218         struct hostent  *hp = NULL;
 219         char            *path;
 220         char            *hname = arg;
 221         int             htype;
 222
 223         if ((path = strchr(arg, ':')) != NULL)
 224                 *path++ = '\0';
 225
 226         if (!path || *path != '/') {
 227                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 228                 return;
 229         }
 230
 231         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 232             (hp = gethostbyname(hname)) != NULL) {
 233                 struct hostent *hp2 = hostent_dup (hp);
 234                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 235                                    hp2->h_addrtype);
 236                 if (hp) {
 237                         free(hp2);
 238                         hp = hostent_dup(hp);
 239                 } else
 240                         hp = hp2;
 241                 exp = export_find(hp, path);
 242                 hname = hp->h_name;
 243         } else {
 244                 exp = export_lookup(hname, path, 0);
 245         }
 246
 247         if (!exp) {
 248                 if (!(eep = mkexportent(hname, path, options)) ||
 249                     !(exp = export_create(eep, 0))) {
 250                         if (hp) free (hp);
 251                         return;
 252                 }
 253         } else if (!updateexportent(&exp->m_export, options)) {
 254                 if (hp) free (hp);
 255                 return;
 256         }
 257
 258         if (verbose)
 259                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 260                         exp->m_export.e_path);
 261         exp->m_xtabent = 1;
 262         exp->m_mayexport = 1;
 263         exp->m_changed = 1;
 264         if (hp) free (hp);
 265 }
 266
 267 static void
 268 unexportfs(char *arg, int verbose)
 269 {
 270         nfs_export      *exp;
 271         struct hostent  *hp = NULL;
 272         char            *path;
 273         char            *hname = arg;
 274         int             htype;
 275
 276         if ((path = strchr(arg, ':')) != NULL)
 277                 *path++ = '\0';
 278
 279         if (!path || *path != '/') {
 280                 fprintf(stderr, "Invalid unexporting option: %s\n",
 281                         arg);
 282                 return;
 283         }
 284
 285         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 286                 if ((hp = gethostbyname(hname)) != 0) {
 287                         hp = hostent_dup (hp);
 288                         hname = (char *) hp->h_name;
 289                 }
 290         }
 291
 292         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 293                 if (path && strcmp(path, exp->m_export.e_path))
 294                         continue;
 295                 if (htype != exp->m_client->m_type)
 296                         continue;
 297                 if (htype == MCL_FQDN
 298                     && !matchhostname(exp->m_export.e_hostname,
 299                                           hname))
 300                         continue;
 301                 if (htype != MCL_FQDN
 302                     && strcasecmp(exp->m_export.e_hostname, hname))
 303                         continue;
 304                 if (verbose) {
 305 #if 0
 306                         if (exp->m_exported) {
 307                                 printf("unexporting %s:%s from kernel\n",
 308                                        exp->m_client->m_hostname,
 309                                        exp->m_export.e_path);
 310                         }
 311                         else
 312 #endif
 313                                 printf("unexporting %s:%s\n",
 314                                         exp->m_client->m_hostname,
 315                                         exp->m_export.e_path);
 316                 }
 317 #if 0
 318                 if (exp->m_exported && !export_unexport(exp))
 319                         error(exp, errno);
 320 #endif
 321                 exp->m_xtabent = 0;
 322                 exp->m_mayexport = 0;
 323         }
 324
 325         if (hp) free (hp);
 326 }
 327
 328 static char
 329 dumpopt(char c, char *fmt, ...)
 330 {
 331         va_list ap;
 332
 333         va_start(ap, fmt);
 334         printf("%c", c);
 335         vprintf(fmt, ap);
 336         va_end(ap);
 337         return ',';
 338 }
 339
 340 static void
 341 dump(int verbose)
 342 {
 343         nfs_export      *exp;
 344         struct exportent *ep;
 345         int             htype;
 346         char            *hname, c;
 347
 348         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 349                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 350                         ep = &exp->m_export;
 351                         if (!exp->m_xtabent)
 352                             continue; /* neilb */
 353                         if (htype == MCL_ANONYMOUS)
 354                                 hname = "<world>";
 355                         else
 356                                 hname = ep->e_hostname;
 357                         if (strlen(ep->e_path) > 14)
 358                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 359                         else
 360                                 printf("%-14s\t%s", ep->e_path, hname);
 361                         if (!verbose) {
 362                                 printf("\n");
 363                                 continue;
 364                         }
 365                         c = '(';
 366                         if (ep->e_flags & NFSEXP_READONLY)
 367                                 c = dumpopt(c, "ro");
 368                         else
 369                                 c = dumpopt(c, "rw");
 370                         if (ep->e_flags & NFSEXP_ASYNC)
 371                                 c = dumpopt(c, "async");
 372                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 373                                 c = dumpopt(c, "wdelay");
 374                         if (ep->e_flags & NFSEXP_NOHIDE)
 375                                 c = dumpopt(c, "nohide");
 376                         if (ep->e_flags & NFSEXP_CROSSMNT)
 377                                 c = dumpopt(c, "crossmnt");
 378                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 379                                 c = dumpopt(c, "insecure");
 380                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 381                                 c = dumpopt(c, "root_squash");
 382                         else
 383                                 c = dumpopt(c, "no_root_squash");
 384                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 385                                 c = dumpopt(c, "all_squash");
 386                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 387                                 c = dumpopt(c, "no_subtree_check");
 388                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 389                                 c = dumpopt(c, "insecure_locks");
 390                         if (ep->e_flags & NFSEXP_FSID)
 391                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 392                         if (ep->e_mountpoint)
 393                                 c = dumpopt(c, "mountpoint%s%s",
 394                                             ep->e_mountpoint[0]?"=":"",
 395                                             ep->e_mountpoint);
 396                         if (ep->e_maptype == CLE_MAP_UGIDD)
 397                                 c = dumpopt(c, "mapping=ugidd");
 398                         else if (ep->e_maptype == CLE_MAP_FILE)
 399                                 c = dumpopt(c, "mapping=file");
 400                         if (ep->e_anonuid != -2)
 401                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 402                         if (ep->e_anongid != -2)
 403                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 404
 405                         printf("%c\n", (c != '(')? ')' : ' ');
 406                 }
 407         }
 408 }
 409
 410 static void
 411 error(nfs_export *exp, int err)
 412 {
 413         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 414                 exp->m_export.e_path, strerror(err));
 415 }
 416
 417 static void
 418 usage(void)
 419 {
 420         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 421         exit(1);
 422 }