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     unexport_all(int verbose);
  28 static void     exportfs(char *arg, char *options, int verbose);
  29 static void     unexportfs(char *arg, int verbose);
  30 static void     exports_update(int verbose);
  31 static void     dump(int verbose);
  32 static void     error(nfs_export *exp, int err);
  33 static void     usage(void);
  34
  35
  36 int
  37 main(int argc, char **argv)
  38 {
  39         char    *options = NULL;
  40         int     f_export = 1;
  41         int     f_all = 0;
  42         int     f_verbose = 0;
  43         int     f_reexport = 0;
  44         int     f_ignore = 0;
  45         int     i, c;
  46
  47         xlog_open("exportfs");
  48
  49         while ((c = getopt(argc, argv, "aio:ruv")) != EOF) {
  50                 switch(c) {
  51                 case 'a':
  52                         f_all = 1;
  53                         break;
  54                 case 'i':
  55                         f_ignore = 1;
  56                         break;
  57                 case 'o':
  58                         options = optarg;
  59                         break;
  60                 case 'r':
  61                         f_reexport = 1;
  62                         f_all = 1;
  63                         break;
  64                 case 'u':
  65                         f_export = 0;
  66                         break;
  67                 case 'v':
  68                         f_verbose = 1;
  69                         break;
  70                 default:
  71                         usage();
  72                         break;
  73                 }
  74         }
  75
  76         if (optind != argc && f_all) {
  77                 fprintf(stderr,"exportfs: extra arguments are not permitted with -a or -r.\n");
  78                 return 1;
  79         }
  80         if (f_ignore && (f_all || ! f_export)) {
  81                 fprintf(stderr,"exportfs: -i not meaningful with -a, -r or -u.\n");
  82                 return 1;
  83         }
  84         if (f_reexport && ! f_export) {
  85                 fprintf(stderr, "exportfs: -r and -u are incompatible.\n");
  86                 return 1;
  87         }
  88         if (optind == argc && ! f_all) {
  89                 xtab_export_read();
  90                 dump(f_verbose);
  91                 return 0;
  92         }
  93
  94         if (f_export && ! f_ignore)
  95                 export_read(_PATH_EXPORTS);
  96         if (f_export) {
  97                 if (f_all)
  98                         export_all(f_verbose);
  99                 else
 100                         for (i = optind; i < argc ; i++)
 101                                 exportfs(argv[i], options, f_verbose);
 102         }
 103         /* note: xtab_*_read does not update entries if they already exist,
 104          * so this will not lose new options
 105          */
 106         if (!f_reexport)
 107                 xtab_export_read();
 108         if (!f_export) {
 109                 if (f_all)
 110                         unexport_all(f_verbose);
 111                 else
 112                         for (i = optind ; i < argc ; i++)
 113                                 unexportfs(argv[i], f_verbose);
 114         }
 115         rmtab_read();
 116         xtab_mount_read();
 117         exports_update(f_verbose);
 118         xtab_export_write();
 119         xtab_mount_write();
 120
 121         return 0;
 122 }
 123
 124 /* we synchronise intention with reality.
 125  * entries with m_mayexport get exported
 126  * entries with m_exported but not m_mayexport get unexported
 127  * looking at m_client->m_type == MCL_FQDN only
 128  */
 129 static void
 130 exports_update(int verbose)
 131 {
 132         nfs_export      *exp;
 133
 134         for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
 135                 if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 136                         if (verbose)
 137                                 printf("%sexporting %s:%s to kernel\n",
 138                                        exp->m_exported ?"re":"",
 139                                        exp->m_client->m_hostname,
 140                                        exp->m_export.e_path);
 141                         if (!export_export(exp))
 142                                 error(exp, errno);
 143                 }
 144                 if (exp->m_exported && ! exp->m_mayexport) {
 145                         if (verbose)
 146                                 printf("unexporting %s:%s from kernel\n",
 147                                        exp->m_client->m_hostname,
 148                                        exp->m_export.e_path);
 149                         if (!export_unexport(exp))
 150                                 error(exp, errno);
 151                 }
 152         }
 153 }
 154
 155 /*
 156  * export_all finds all entries and
 157  *    marks them xtabent and mayexport so that they get exported
 158  */
 159 static void
 160 export_all(int verbose)
 161 {
 162         nfs_export      *exp;
 163         int             i;
 164
 165         for (i = 0; i < MCL_MAXTYPES; i++) {
 166                 for (exp = exportlist[i]; exp; exp = exp->m_next) {
 167                         if (verbose)
 168                                 printf("exporting %s:%s\n",
 169                                        exp->m_client->m_hostname,
 170                                        exp->m_export.e_path);
 171                         exp->m_xtabent = 1;
 172                         exp->m_mayexport = 1;
 173                         exp->m_changed = 1;
 174                 }
 175         }
 176 }
 177 /*
 178  * unexport_all finds all entries that are mayexport, and
 179  *    marks them not xtabent and not mayexport
 180  */
 181 static void
 182 unexport_all(int verbose)
 183 {
 184         nfs_export      *exp;
 185         int             i;
 186
 187         for (i = 0; i < MCL_MAXTYPES; i++) {
 188                 for (exp = exportlist[i]; exp; exp = exp->m_next)
 189                         if (exp->m_mayexport) {
 190                                 if (verbose) {
 191                                         if (exp->m_exported) {
 192                                                 printf("unexporting %s:%s from kernel\n",
 193                                                        exp->m_client->m_hostname,
 194                                                        exp->m_export.e_path);
 195                                         }
 196                                         else {
 197                                                 printf("unexporting %s:%s\n",
 198                                                         exp->m_client->m_hostname,
 199                                                         exp->m_export.e_path);
 200                                         }
 201                                 }
 202                                 if (exp->m_exported && !export_unexport(exp))
 203                                         error(exp, errno);
 204                                 exp->m_xtabent = 0;
 205                                 exp->m_mayexport = 0;
 206                         }
 207         }
 208 }
 209
 210
 211 static void
 212 exportfs(char *arg, char *options, int verbose)
 213 {
 214         struct exportent *eep;
 215         nfs_export      *exp;
 216         struct hostent  *hp = NULL;
 217         char            *path;
 218         char            *hname = arg;
 219         int             htype;
 220
 221         if ((path = strchr(arg, ':')) != NULL)
 222                 *path++ = '\0';
 223
 224         if (!path || *path != '/') {
 225                 fprintf(stderr, "Invalid exporting option: %s\n", arg);
 226                 return;
 227         }
 228
 229         if ((htype = client_gettype(hname)) == MCL_FQDN &&
 230             (hp = gethostbyname(hname)) != NULL) {
 231                 struct hostent *hp2 = hostent_dup (hp);
 232                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
 233                                    hp2->h_addrtype);
 234                 if (hp) {
 235                         free(hp2);
 236                         hp = hostent_dup(hp);
 237                 } else
 238                         hp = hp2;
 239                 exp = export_find(hp, path);
 240         } else {
 241                 exp = export_lookup(hname, path);
 242         }
 243
 244         if (!exp) {
 245                 if (!(eep = mkexportent(hname, path, options)) ||
 246                     !(exp = export_create(eep))) {
 247                         if (hp) free (hp);
 248                         return;
 249                 }
 250         } else if (!updateexportent(&exp->m_export, options)) {
 251                 if (hp) free (hp);
 252                 return;
 253         }
 254
 255         if (verbose)
 256                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 257                         exp->m_export.e_path);
 258         exp->m_xtabent = 1;
 259         exp->m_mayexport = 1;
 260         exp->m_changed = 1;
 261         if (hp) free (hp);
 262 }
 263
 264 static void
 265 unexportfs(char *arg, int verbose)
 266 {
 267         nfs_export      *exp;
 268         struct hostent  *hp = NULL;
 269         char            *path;
 270         char            *hname = arg;
 271         int             htype;
 272
 273         if ((path = strchr(arg, ':')) != NULL)
 274                 *path++ = '\0';
 275
 276         if (!path || *path != '/') {
 277                 fprintf(stderr, "Invalid unexporting option: %s\n",
 278                         arg);
 279                 return;
 280         }
 281
 282         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 283                 if ((hp = gethostbyname(hname)) != 0) {
 284                         hp = hostent_dup (hp);
 285                         hname = (char *) hp->h_name;
 286                 }
 287         }
 288
 289         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 290                 if (path && strcmp(path, exp->m_export.e_path))
 291                         continue;
 292                 if (htype != exp->m_client->m_type
 293                     || (htype == MCL_FQDN
 294                         && !matchhostname(exp->m_export.e_hostname,
 295                                           hname)))
 296                         continue;
 297                 if (verbose) {
 298                         if (exp->m_exported) {
 299                                 printf("unexporting %s:%s from kernel\n",
 300                                        exp->m_client->m_hostname,
 301                                        exp->m_export.e_path);
 302                         }
 303                         else {
 304                                 printf("unexporting %s:%s\n",
 305                                         exp->m_client->m_hostname,
 306                                         exp->m_export.e_path);
 307                         }
 308                 }
 309                 if (exp->m_exported && !export_unexport(exp))
 310                         error(exp, errno);
 311                 exp->m_xtabent = 0;
 312                 exp->m_mayexport = 0;
 313         }
 314
 315         if (hp) free (hp);
 316 }
 317
 318 static char
 319 dumpopt(char c, char *fmt, ...)
 320 {
 321         va_list ap;
 322
 323         va_start(ap, fmt);
 324         printf("%c", c);
 325         vprintf(fmt, ap);
 326         va_end(ap);
 327         return ',';
 328 }
 329
 330 static void
 331 dump(int verbose)
 332 {
 333         nfs_export      *exp;
 334         struct exportent *ep;
 335         int             htype;
 336         char            *hname, c;
 337
 338         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 339                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 340                         ep = &exp->m_export;
 341                         if (!exp->m_xtabent)
 342                             continue; /* neilb */
 343                         if (htype == MCL_ANONYMOUS)
 344                                 hname = "<world>";
 345                         else
 346                                 hname = ep->e_hostname;
 347                         if (strlen(ep->e_path) > 14)
 348                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 349                         else
 350                                 printf("%-14s\t%s", ep->e_path, hname);
 351                         if (!verbose) {
 352                                 printf("\n");
 353                                 continue;
 354                         }
 355                         c = '(';
 356                         if (ep->e_flags & NFSEXP_READONLY)
 357                                 c = dumpopt(c, "ro");
 358                         else
 359                                 c = dumpopt(c, "rw");
 360                         if (ep->e_flags & NFSEXP_ASYNC)
 361                                 c = dumpopt(c, "async");
 362                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 363                                 c = dumpopt(c, "wdelay");
 364                         if (ep->e_flags & NFSEXP_CROSSMNT)
 365                                 c = dumpopt(c, "nohide");
 366                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 367                                 c = dumpopt(c, "insecure");
 368                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 369                                 c = dumpopt(c, "root_squash");
 370                         else
 371                                 c = dumpopt(c, "no_root_squash");
 372                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 373                                 c = dumpopt(c, "all_squash");
 374                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 375                                 c = dumpopt(c, "no_subtree_check");
 376                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 377                                 c = dumpopt(c, "insecure_locks");
 378                         if (ep->e_maptype == CLE_MAP_UGIDD)
 379                                 c = dumpopt(c, "mapping=ugidd");
 380                         else if (ep->e_maptype == CLE_MAP_FILE)
 381                                 c = dumpopt(c, "mapping=file");
 382                         if (ep->e_anonuid != -2)
 383                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 384                         if (ep->e_anongid != -2)
 385                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 386
 387                         printf("%c\n", (c != '(')? ')' : ' ');
 388                 }
 389         }
 390 }
 391
 392 static void
 393 error(nfs_export *exp, int err)
 394 {
 395         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 396                 exp->m_export.e_path, strerror(err));
 397 }
 398
 399 static void
 400 usage(void)
 401 {
 402         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 403         exit(1);
 404 }