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         if (optind == argc && ! f_all) {
  95                 xtab_export_read();
  96                 dump(f_verbose);
  97                 return 0;
  98         }
  99
 100         new_cache = check_new_cache();
 101
 102         if (f_export && ! f_ignore)
 103                 export_read(_PATH_EXPORTS);
 104         if (f_export) {
 105                 if (f_all)
 106                         export_all(f_verbose);
 107                 else
 108                         for (i = optind; i < argc ; i++)
 109                                 exportfs(argv[i], options, f_verbose);
 110         }
 111         /* If we are unexporting everything, then
 112          * don't care about what should be exported, as that
 113          * may require DNS lookups..
 114          */
 115         if (! ( !f_export && f_all)) {
 116                 /* note: xtab_*_read does not update entries if they already exist,
 117                  * so this will not lose new options
 118                  */
 119                 if (!f_reexport)
 120                         xtab_export_read();
 121                 if (!f_export)
 122                         for (i = optind ; i < argc ; i++)
 123                                 unexportfs(argv[i], f_verbose);
 124                 rmtab_read();
 125         }
 126         if (!new_cache) {
 127                 xtab_mount_read();
 128                 exports_update(f_verbose);
 129         }
 130         xtab_export_write();
 131         if (new_cache)
 132                 cache_flush(force_flush);
 133         if (!new_cache)
 134                 xtab_mount_write();
 135
 136         return export_errno;
 137 }
 138
 139 /* we synchronise intention with reality.
 140  * entries with m_mayexport get exported
 141  * entries with m_exported but not m_mayexport get unexported
 142  * looking at m_client->m_type == MCL_FQDN only
 143  */
 144 static void
 145 exports_update(int verbose)
 146 {
 147         nfs_export      *exp;
 148
 149         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 150                 /* check mountpoint option */
 151                 if (exp->m_mayexport &&
 152                     exp->m_export.e_mountpoint &&
 153                     !is_mountpoint(exp->m_export.e_mountpoint[0]?
 154                                    exp->m_export.e_mountpoint:
 155                                    exp->m_export.e_path)) {
 156                         printf("%s not exported as %s not a mountpoint.\n",
 157                                exp->m_export.e_path, exp->m_export.e_mountpoint);
 158                         exp->m_mayexport = 0;
 159                 }
 160                 if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 161                         if (verbose)
 162                                 printf("%sexporting %s:%s to kernel\n",
 163                                        exp->m_exported ?"re":"",
 164                                        exp->m_client->m_hostname,
 165                                        exp->m_export.e_path);
 166                         if (!export_export(exp))
 167                                 error(exp, errno);
 168                 }
 169                 if (exp->m_exported && ! exp->m_mayexport) {
 170                         if (verbose)
 171                                 printf("unexporting %s:%s from kernel\n",
 172                                        exp->m_client->m_hostname,
 173                                        exp->m_export.e_path);
 174                         if (!export_unexport(exp))
 175                                 error(exp, errno);
 176                 }
 177         }
 178 }
 179
 180 /*
 181  * export_all finds all entries and
 182  *    marks them xtabent and mayexport so that they get exported
 183  */
 184 static void
 185 export_all(int verbose)
 186 {
 187         nfs_export      *exp;
 188         int             i;
 189
 190         for (i = 0; i < MCL_MAXTYPES; i++) {
 191                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 192                         if (verbose)
 193                                 printf("exporting %s:%s\n",
 194                                        exp->m_client->m_hostname,
 195                                        exp->m_export.e_path);
 196                         exp->m_xtabent = 1;
 197                         exp->m_mayexport = 1;
 198                         exp->m_changed = 1;
 199                 }
 200         }
 201 }
 202
 203
 204 static void
 205 exportfs(char *arg, char *options, int verbose)
 206 {
 207         struct exportent *eep;
 208         nfs_export      *exp;
 209         struct hostent  *hp = NULL;
 210         char            *path;
 211         char            *hname = arg;
 212         int             htype;
 213
 214         if ((path = strchr(arg, ':')) != NULL)
 215                 *path++ = '\0';
 216
 217         if (!path || *path != '/') {
 218                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 219                 return;
 220         }
 221
 222         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 223             (hp = gethostbyname(hname)) != NULL) {
 224                 struct hostent *hp2 = hostent_dup (hp);
 225                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 226                                    hp2->h_addrtype);
 227                 if (hp) {
 228                         free(hp2);
 229                         hp = hostent_dup(hp);
 230                 } else
 231                         hp = hp2;
 232                 exp = export_find(hp, path);
 233                 hname = hp->h_name;
 234         } else {
 235                 exp = export_lookup(hname, path, 0);
 236         }
 237
 238         if (!exp) {
 239                 if (!(eep = mkexportent(hname, path, options)) ||
 240                     !(exp = export_create(eep, 0))) {
 241                         if (hp) free (hp);
 242                         return;
 243                 }
 244         } else if (!updateexportent(&exp->m_export, options)) {
 245                 if (hp) free (hp);
 246                 return;
 247         }
 248
 249         if (verbose)
 250                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 251                         exp->m_export.e_path);
 252         exp->m_xtabent = 1;
 253         exp->m_mayexport = 1;
 254         exp->m_changed = 1;
 255         if (hp) free (hp);
 256 }
 257
 258 static void
 259 unexportfs(char *arg, int verbose)
 260 {
 261         nfs_export      *exp;
 262         struct hostent  *hp = NULL;
 263         char            *path;
 264         char            *hname = arg;
 265         int             htype;
 266
 267         if ((path = strchr(arg, ':')) != NULL)
 268                 *path++ = '\0';
 269
 270         if (!path || *path != '/') {
 271                 fprintf(stderr, "Invalid unexporting option: %s\n",
 272                         arg);
 273                 return;
 274         }
 275
 276         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 277                 if ((hp = gethostbyname(hname)) != 0) {
 278                         hp = hostent_dup (hp);
 279                         hname = (char *) hp->h_name;
 280                 }
 281         }
 282
 283         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 284                 if (path && strcmp(path, exp->m_export.e_path))
 285                         continue;
 286                 if (htype != exp->m_client->m_type
 287                     || (htype == MCL_FQDN
 288                         && !matchhostname(exp->m_export.e_hostname,
 289                                           hname)))
 290                         continue;
 291                 if (verbose) {
 292 #if 0
 293                         if (exp->m_exported) {
 294                                 printf("unexporting %s:%s from kernel\n",
 295                                        exp->m_client->m_hostname,
 296                                        exp->m_export.e_path);
 297                         }
 298                         else
 299 #endif
 300                                 printf("unexporting %s:%s\n",
 301                                         exp->m_client->m_hostname,
 302                                         exp->m_export.e_path);
 303                 }
 304 #if 0
 305                 if (exp->m_exported && !export_unexport(exp))
 306                         error(exp, errno);
 307 #endif
 308                 exp->m_xtabent = 0;
 309                 exp->m_mayexport = 0;
 310         }
 311
 312         if (hp) free (hp);
 313 }
 314
 315 static char
 316 dumpopt(char c, char *fmt, ...)
 317 {
 318         va_list ap;
 319
 320         va_start(ap, fmt);
 321         printf("%c", c);
 322         vprintf(fmt, ap);
 323         va_end(ap);
 324         return ',';
 325 }
 326
 327 static void
 328 dump(int verbose)
 329 {
 330         nfs_export      *exp;
 331         struct exportent *ep;
 332         int             htype;
 333         char            *hname, c;
 334
 335         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 336                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 337                         ep = &exp->m_export;
 338                         if (!exp->m_xtabent)
 339                             continue; /* neilb */
 340                         if (htype == MCL_ANONYMOUS)
 341                                 hname = "<world>";
 342                         else
 343                                 hname = ep->e_hostname;
 344                         if (strlen(ep->e_path) > 14)
 345                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 346                         else
 347                                 printf("%-14s\t%s", ep->e_path, hname);
 348                         if (!verbose) {
 349                                 printf("\n");
 350                                 continue;
 351                         }
 352                         c = '(';
 353                         if (ep->e_flags & NFSEXP_READONLY)
 354                                 c = dumpopt(c, "ro");
 355                         else
 356                                 c = dumpopt(c, "rw");
 357                         if (ep->e_flags & NFSEXP_ASYNC)
 358                                 c = dumpopt(c, "async");
 359                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 360                                 c = dumpopt(c, "wdelay");
 361                         if (ep->e_flags & NFSEXP_NOHIDE)
 362                                 c = dumpopt(c, "nohide");
 363                         if (ep->e_flags & NFSEXP_CROSSMNT)
 364                                 c = dumpopt(c, "crossmnt");
 365                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 366                                 c = dumpopt(c, "insecure");
 367                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 368                                 c = dumpopt(c, "root_squash");
 369                         else
 370                                 c = dumpopt(c, "no_root_squash");
 371                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 372                                 c = dumpopt(c, "all_squash");
 373                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 374                                 c = dumpopt(c, "no_subtree_check");
 375                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 376                                 c = dumpopt(c, "insecure_locks");
 377                         if (ep->e_flags & NFSEXP_FSID)
 378                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 379                         if (ep->e_mountpoint)
 380                                 c = dumpopt(c, "mountpoint%s%s",
 381                                             ep->e_mountpoint[0]?"=":"",
 382                                             ep->e_mountpoint);
 383                         if (ep->e_maptype == CLE_MAP_UGIDD)
 384                                 c = dumpopt(c, "mapping=ugidd");
 385                         else if (ep->e_maptype == CLE_MAP_FILE)
 386                                 c = dumpopt(c, "mapping=file");
 387                         if (ep->e_anonuid != -2)
 388                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 389                         if (ep->e_anongid != -2)
 390                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 391
 392                         printf("%c\n", (c != '(')? ')' : ' ');
 393                 }
 394         }
 395 }
 396
 397 static void
 398 error(nfs_export *exp, int err)
 399 {
 400         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 401                 exp->m_export.e_path, strerror(err));
 402 }
 403
 404 static void
 405 usage(void)
 406 {
 407         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 408         exit(1);
 409 }