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