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                 if (force_flush) {
  96                         cache_flush(1);
  97                 } else {
  98                         xtab_export_read();
  99                         dump(f_verbose);
 100                         return 0;
 101                 }
 102         }
 103         new_cache = check_new_cache();
 104
 105         if (f_export && ! f_ignore)
 106                 export_read(_PATH_EXPORTS);
 107         if (f_export) {
 108                 if (f_all)
 109                         export_all(f_verbose);
 110                 else
 111                         for (i = optind; i < argc ; i++)
 112                                 exportfs(argv[i], options, f_verbose);
 113         }
 114         /* If we are unexporting everything, then
 115          * don't care about what should be exported, as that
 116          * may require DNS lookups..
 117          */
 118         if (! ( !f_export && f_all)) {
 119                 /* note: xtab_*_read does not update entries if they already exist,
 120                  * so this will not lose new options
 121                  */
 122                 if (!f_reexport)
 123                         xtab_export_read();
 124                 if (!f_export)
 125                         for (i = optind ; i < argc ; i++)
 126                                 unexportfs(argv[i], f_verbose);
 127                 rmtab_read();
 128         }
 129         if (!new_cache) {
 130                 xtab_mount_read();
 131                 exports_update(f_verbose);
 132         }
 133         xtab_export_write();
 134         if (new_cache)
 135                 cache_flush(force_flush);
 136         if (!new_cache)
 137                 xtab_mount_write();
 138
 139         return export_errno;
 140 }
 141
 142 /* we synchronise intention with reality.
 143  * entries with m_mayexport get exported
 144  * entries with m_exported but not m_mayexport get unexported
 145  * looking at m_client->m_type == MCL_FQDN only
 146  */
 147 static void
 148 exports_update(int verbose)
 149 {
 150         nfs_export      *exp;
 151
 152         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 153                 /* check mountpoint option */
 154                 if (exp->m_mayexport &&
 155                     exp->m_export.e_mountpoint &&
 156                     !is_mountpoint(exp->m_export.e_mountpoint[0]?
 157                                    exp->m_export.e_mountpoint:
 158                                    exp->m_export.e_path)) {
 159                         printf("%s not exported as %s not a mountpoint.\n",
 160                                exp->m_export.e_path, exp->m_export.e_mountpoint);
 161                         exp->m_mayexport = 0;
 162                 }
 163                 if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 164                         if (verbose)
 165                                 printf("%sexporting %s:%s to kernel\n",
 166                                        exp->m_exported ?"re":"",
 167                                        exp->m_client->m_hostname,
 168                                        exp->m_export.e_path);
 169                         if (!export_export(exp))
 170                                 error(exp, errno);
 171                 }
 172                 if (exp->m_exported && ! exp->m_mayexport) {
 173                         if (verbose)
 174                                 printf("unexporting %s:%s from kernel\n",
 175                                        exp->m_client->m_hostname,
 176                                        exp->m_export.e_path);
 177                         if (!export_unexport(exp))
 178                                 error(exp, errno);
 179                 }
 180         }
 181 }
 182
 183 /*
 184  * export_all finds all entries and
 185  *    marks them xtabent and mayexport so that they get exported
 186  */
 187 static void
 188 export_all(int verbose)
 189 {
 190         nfs_export      *exp;
 191         int             i;
 192
 193         for (i = 0; i < MCL_MAXTYPES; i++) {
 194                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 195                         if (verbose)
 196                                 printf("exporting %s:%s\n",
 197                                        exp->m_client->m_hostname,
 198                                        exp->m_export.e_path);
 199                         exp->m_xtabent = 1;
 200                         exp->m_mayexport = 1;
 201                         exp->m_changed = 1;
 202                 }
 203         }
 204 }
 205
 206
 207 static void
 208 exportfs(char *arg, char *options, int verbose)
 209 {
 210         struct exportent *eep;
 211         nfs_export      *exp;
 212         struct hostent  *hp = NULL;
 213         char            *path;
 214         char            *hname = arg;
 215         int             htype;
 216
 217         if ((path = strchr(arg, ':')) != NULL)
 218                 *path++ = '\0';
 219
 220         if (!path || *path != '/') {
 221                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 222                 return;
 223         }
 224
 225         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 226             (hp = gethostbyname(hname)) != NULL) {
 227                 struct hostent *hp2 = hostent_dup (hp);
 228                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 229                                    hp2->h_addrtype);
 230                 if (hp) {
 231                         free(hp2);
 232                         hp = hostent_dup(hp);
 233                 } else
 234                         hp = hp2;
 235                 exp = export_find(hp, path);
 236                 hname = hp->h_name;
 237         } else {
 238                 exp = export_lookup(hname, path, 0);
 239         }
 240
 241         if (!exp) {
 242                 if (!(eep = mkexportent(hname, path, options)) ||
 243                     !(exp = export_create(eep, 0))) {
 244                         if (hp) free (hp);
 245                         return;
 246                 }
 247         } else if (!updateexportent(&exp->m_export, options)) {
 248                 if (hp) free (hp);
 249                 return;
 250         }
 251
 252         if (verbose)
 253                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 254                         exp->m_export.e_path);
 255         exp->m_xtabent = 1;
 256         exp->m_mayexport = 1;
 257         exp->m_changed = 1;
 258         if (hp) free (hp);
 259 }
 260
 261 static void
 262 unexportfs(char *arg, int verbose)
 263 {
 264         nfs_export      *exp;
 265         struct hostent  *hp = NULL;
 266         char            *path;
 267         char            *hname = arg;
 268         int             htype;
 269
 270         if ((path = strchr(arg, ':')) != NULL)
 271                 *path++ = '\0';
 272
 273         if (!path || *path != '/') {
 274                 fprintf(stderr, "Invalid unexporting option: %s\n",
 275                         arg);
 276                 return;
 277         }
 278
 279         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 280                 if ((hp = gethostbyname(hname)) != 0) {
 281                         hp = hostent_dup (hp);
 282                         hname = (char *) hp->h_name;
 283                 }
 284         }
 285
 286         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 287                 if (path && strcmp(path, exp->m_export.e_path))
 288                         continue;
 289                 if (htype != exp->m_client->m_type)
 290                         continue;
 291                 if (htype == MCL_FQDN
 292                     && !matchhostname(exp->m_export.e_hostname,
 293                                           hname))
 294                         continue;
 295                 if (htype != MCL_FQDN
 296                     && strcasecmp(exp->m_export.e_hostname, hname))
 297                         continue;
 298                 if (verbose) {
 299 #if 0
 300                         if (exp->m_exported) {
 301                                 printf("unexporting %s:%s from kernel\n",
 302                                        exp->m_client->m_hostname,
 303                                        exp->m_export.e_path);
 304                         }
 305                         else
 306 #endif
 307                                 printf("unexporting %s:%s\n",
 308                                         exp->m_client->m_hostname,
 309                                         exp->m_export.e_path);
 310                 }
 311 #if 0
 312                 if (exp->m_exported && !export_unexport(exp))
 313                         error(exp, errno);
 314 #endif
 315                 exp->m_xtabent = 0;
 316                 exp->m_mayexport = 0;
 317         }
 318
 319         if (hp) free (hp);
 320 }
 321
 322 static char
 323 dumpopt(char c, char *fmt, ...)
 324 {
 325         va_list ap;
 326
 327         va_start(ap, fmt);
 328         printf("%c", c);
 329         vprintf(fmt, ap);
 330         va_end(ap);
 331         return ',';
 332 }
 333
 334 static void
 335 dump(int verbose)
 336 {
 337         nfs_export      *exp;
 338         struct exportent *ep;
 339         int             htype;
 340         char            *hname, c;
 341
 342         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 343                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 344                         ep = &exp->m_export;
 345                         if (!exp->m_xtabent)
 346                             continue; /* neilb */
 347                         if (htype == MCL_ANONYMOUS)
 348                                 hname = "<world>";
 349                         else
 350                                 hname = ep->e_hostname;
 351                         if (strlen(ep->e_path) > 14)
 352                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 353                         else
 354                                 printf("%-14s\t%s", ep->e_path, hname);
 355                         if (!verbose) {
 356                                 printf("\n");
 357                                 continue;
 358                         }
 359                         c = '(';
 360                         if (ep->e_flags & NFSEXP_READONLY)
 361                                 c = dumpopt(c, "ro");
 362                         else
 363                                 c = dumpopt(c, "rw");
 364                         if (ep->e_flags & NFSEXP_ASYNC)
 365                                 c = dumpopt(c, "async");
 366                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 367                                 c = dumpopt(c, "wdelay");
 368                         if (ep->e_flags & NFSEXP_NOHIDE)
 369                                 c = dumpopt(c, "nohide");
 370                         if (ep->e_flags & NFSEXP_CROSSMNT)
 371                                 c = dumpopt(c, "crossmnt");
 372                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 373                                 c = dumpopt(c, "insecure");
 374                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 375                                 c = dumpopt(c, "root_squash");
 376                         else
 377                                 c = dumpopt(c, "no_root_squash");
 378                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 379                                 c = dumpopt(c, "all_squash");
 380                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 381                                 c = dumpopt(c, "no_subtree_check");
 382                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 383                                 c = dumpopt(c, "insecure_locks");
 384                         if (ep->e_flags & NFSEXP_FSID)
 385                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 386                         if (ep->e_mountpoint)
 387                                 c = dumpopt(c, "mountpoint%s%s",
 388                                             ep->e_mountpoint[0]?"=":"",
 389                                             ep->e_mountpoint);
 390                         if (ep->e_maptype == CLE_MAP_UGIDD)
 391                                 c = dumpopt(c, "mapping=ugidd");
 392                         else if (ep->e_maptype == CLE_MAP_FILE)
 393                                 c = dumpopt(c, "mapping=file");
 394                         if (ep->e_anonuid != -2)
 395                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 396                         if (ep->e_anongid != -2)
 397                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 398
 399                         printf("%c\n", (c != '(')? ')' : ' ');
 400                 }
 401         }
 402 }
 403
 404 static void
 405 error(nfs_export *exp, int err)
 406 {
 407         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 408                 exp->m_export.e_path, strerror(err));
 409 }
 410
 411 static void
 412 usage(void)
 413 {
 414         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 415         exit(1);
 416 }