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 /* we synchronise intention with reality.
 150  * entries with m_mayexport get exported
 151  * entries with m_exported but not m_mayexport get unexported
 152  * looking at m_client->m_type == MCL_FQDN only
 153  */
 154 static void
 155 exports_update(int verbose)
 156 {
 157         nfs_export      *exp;
 158
 159         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 160                 /* check mountpoint option */
 161                 if (exp->m_mayexport &&
 162                     exp->m_export.e_mountpoint &&
 163                     !is_mountpoint(exp->m_export.e_mountpoint[0]?
 164                                    exp->m_export.e_mountpoint:
 165                                    exp->m_export.e_path)) {
 166                         printf("%s not exported as %s not a mountpoint.\n",
 167                                exp->m_export.e_path, exp->m_export.e_mountpoint);
 168                         exp->m_mayexport = 0;
 169                 }
 170                 if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 171                         if (verbose)
 172                                 printf("%sexporting %s:%s to kernel\n",
 173                                        exp->m_exported ?"re":"",
 174                                        exp->m_client->m_hostname,
 175                                        exp->m_export.e_path);
 176                         if (!export_export(exp))
 177                                 error(exp, errno);
 178                 }
 179                 if (exp->m_exported && ! exp->m_mayexport) {
 180                         if (verbose)
 181                                 printf("unexporting %s:%s from kernel\n",
 182                                        exp->m_client->m_hostname,
 183                                        exp->m_export.e_path);
 184                         if (!export_unexport(exp))
 185                                 error(exp, errno);
 186                 }
 187         }
 188 }
 189
 190 /*
 191  * export_all finds all entries and
 192  *    marks them xtabent and mayexport so that they get exported
 193  */
 194 static void
 195 export_all(int verbose)
 196 {
 197         nfs_export      *exp;
 198         int             i;
 199
 200         for (i = 0; i < MCL_MAXTYPES; i++) {
 201                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 202                         if (verbose)
 203                                 printf("exporting %s:%s\n",
 204                                        exp->m_client->m_hostname,
 205                                        exp->m_export.e_path);
 206                         exp->m_xtabent = 1;
 207                         exp->m_mayexport = 1;
 208                         exp->m_changed = 1;
 209                 }
 210         }
 211 }
 212
 213
 214 static void
 215 exportfs(char *arg, char *options, int verbose)
 216 {
 217         struct exportent *eep;
 218         nfs_export      *exp;
 219         struct hostent  *hp = NULL;
 220         char            *path;
 221         char            *hname = arg;
 222         int             htype;
 223
 224         if ((path = strchr(arg, ':')) != NULL)
 225                 *path++ = '\0';
 226
 227         if (!path || *path != '/') {
 228                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 229                 return;
 230         }
 231
 232         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 233             (hp = gethostbyname(hname)) != NULL) {
 234                 struct hostent *hp2 = hostent_dup (hp);
 235                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 236                                    hp2->h_addrtype);
 237                 if (hp) {
 238                         free(hp2);
 239                         hp = hostent_dup(hp);
 240                 } else
 241                         hp = hp2;
 242                 exp = export_find(hp, path);
 243                 hname = hp->h_name;
 244         } else {
 245                 exp = export_lookup(hname, path, 0);
 246         }
 247
 248         if (!exp) {
 249                 if (!(eep = mkexportent(hname, path, options)) ||
 250                     !(exp = export_create(eep, 0))) {
 251                         if (hp) free (hp);
 252                         return;
 253                 }
 254         } else if (!updateexportent(&exp->m_export, options)) {
 255                 if (hp) free (hp);
 256                 return;
 257         }
 258
 259         if (verbose)
 260                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 261                         exp->m_export.e_path);
 262         exp->m_xtabent = 1;
 263         exp->m_mayexport = 1;
 264         exp->m_changed = 1;
 265         if (hp) free (hp);
 266 }
 267
 268 static void
 269 unexportfs(char *arg, int verbose)
 270 {
 271         nfs_export      *exp;
 272         struct hostent  *hp = NULL;
 273         char            *path;
 274         char            *hname = arg;
 275         int             htype;
 276
 277         if ((path = strchr(arg, ':')) != NULL)
 278                 *path++ = '\0';
 279
 280         if (!path || *path != '/') {
 281                 fprintf(stderr, "Invalid unexporting option: %s\n",
 282                         arg);
 283                 return;
 284         }
 285
 286         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 287                 if ((hp = gethostbyname(hname)) != 0) {
 288                         hp = hostent_dup (hp);
 289                         hname = (char *) hp->h_name;
 290                 }
 291         }
 292
 293         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 294                 if (path && strcmp(path, exp->m_export.e_path))
 295                         continue;
 296                 if (htype != exp->m_client->m_type)
 297                         continue;
 298                 if (htype == MCL_FQDN
 299                     && !matchhostname(exp->m_export.e_hostname,
 300                                           hname))
 301                         continue;
 302                 if (htype != MCL_FQDN
 303                     && strcasecmp(exp->m_export.e_hostname, hname))
 304                         continue;
 305                 if (verbose) {
 306 #if 0
 307                         if (exp->m_exported) {
 308                                 printf("unexporting %s:%s from kernel\n",
 309                                        exp->m_client->m_hostname,
 310                                        exp->m_export.e_path);
 311                         }
 312                         else
 313 #endif
 314                                 printf("unexporting %s:%s\n",
 315                                         exp->m_client->m_hostname,
 316                                         exp->m_export.e_path);
 317                 }
 318 #if 0
 319                 if (exp->m_exported && !export_unexport(exp))
 320                         error(exp, errno);
 321 #endif
 322                 exp->m_xtabent = 0;
 323                 exp->m_mayexport = 0;
 324         }
 325
 326         if (hp) free (hp);
 327 }
 328
 329 static char
 330 dumpopt(char c, char *fmt, ...)
 331 {
 332         va_list ap;
 333
 334         va_start(ap, fmt);
 335         printf("%c", c);
 336         vprintf(fmt, ap);
 337         va_end(ap);
 338         return ',';
 339 }
 340
 341 static void
 342 dump(int verbose)
 343 {
 344         nfs_export      *exp;
 345         struct exportent *ep;
 346         int             htype;
 347         char            *hname, c;
 348
 349         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 350                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 351                         ep = &exp->m_export;
 352                         if (!exp->m_xtabent)
 353                             continue; /* neilb */
 354                         if (htype == MCL_ANONYMOUS)
 355                                 hname = "<world>";
 356                         else
 357                                 hname = ep->e_hostname;
 358                         if (strlen(ep->e_path) > 14)
 359                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 360                         else
 361                                 printf("%-14s\t%s", ep->e_path, hname);
 362                         if (!verbose) {
 363                                 printf("\n");
 364                                 continue;
 365                         }
 366                         c = '(';
 367                         if (ep->e_flags & NFSEXP_READONLY)
 368                                 c = dumpopt(c, "ro");
 369                         else
 370                                 c = dumpopt(c, "rw");
 371                         if (ep->e_flags & NFSEXP_ASYNC)
 372                                 c = dumpopt(c, "async");
 373                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 374                                 c = dumpopt(c, "wdelay");
 375                         if (ep->e_flags & NFSEXP_NOHIDE)
 376                                 c = dumpopt(c, "nohide");
 377                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 378                                 c = dumpopt(c, "crossmnt");
 379                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 380                                 c = dumpopt(c, "insecure");
 381                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 382                                 c = dumpopt(c, "root_squash");
 383                         else
 384                                 c = dumpopt(c, "no_root_squash");
 385                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 386                                 c = dumpopt(c, "all_squash");
 387                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 388                                 c = dumpopt(c, "no_subtree_check");
 389                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 390                                 c = dumpopt(c, "insecure_locks");
 391                         if (ep->e_flags & NFSEXP_FSID)
 392                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 393                         if (ep->e_mountpoint)
 394                                 c = dumpopt(c, "mountpoint%s%s",
 395                                             ep->e_mountpoint[0]?"=":"",
 396                                             ep->e_mountpoint);
 397                         if (ep->e_maptype == CLE_MAP_UGIDD)
 398                                 c = dumpopt(c, "mapping=ugidd");
 399                         else if (ep->e_maptype == CLE_MAP_FILE)
 400                                 c = dumpopt(c, "mapping=file");
 401                         if (ep->e_anonuid != -2)
 402                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 403                         if (ep->e_anongid != -2)
 404                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 405
 406                         printf("%c\n", (c != '(')? ')' : ' ');
 407                 }
 408         }
 409 }
 410
 411 static void
 412 error(nfs_export *exp, int err)
 413 {
 414         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 415                 exp->m_export.e_path, strerror(err));
 416 }
 417
 418 static void
 419 usage(void)
 420 {
 421         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 422         exit(1);
 423 }