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 || 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                 hp = hostent_dup (hp);
 232                 exp = export_find(hp, path);
 233         } else {
 234                 exp = export_lookup(hname, path);
 235         }
 236
 237         if (!exp) {
 238                 if (!(eep = mkexportent(hname, path, options)) ||
 239                     !(exp = export_create(eep))) {
 240                         if (hp) free (hp);
 241                         return;
 242                 }
 243         } else if (!updateexportent(&exp->m_export, options)) {
 244                 if (hp) free (hp);
 245                 return;
 246         }
 247
 248         if (verbose)
 249                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 250                         exp->m_export.e_path);
 251         exp->m_xtabent = 1;
 252         exp->m_mayexport = 1;
 253         exp->m_changed = 1;
 254         if (hp) free (hp);
 255 }
 256
 257 static void
 258 unexportfs(char *arg, int verbose)
 259 {
 260         nfs_export      *exp;
 261         struct hostent  *hp = NULL;
 262         char            *path;
 263         char            *hname = arg;
 264         int             htype;
 265
 266         if ((path = strchr(arg, ':')) != NULL)
 267                 *path++ = '\0';
 268
 269         if (!path || *path != '/') {
 270                 fprintf(stderr, "Invalid unexporting option: %s\n",
 271                         arg);
 272                 return;
 273         }
 274
 275         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 276                 if ((hp = gethostbyname(hname)) != 0) {
 277                         hp = hostent_dup (hp);
 278                         hname = (char *) hp->h_name;
 279                 }
 280         }
 281
 282         for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 283                 if (path && strcmp(path, exp->m_export.e_path))
 284                         continue;
 285                 if (htype != exp->m_client->m_type
 286                     || (htype == MCL_FQDN
 287                         && !matchhostname(exp->m_export.e_hostname,
 288                                           hname)))
 289                         continue;
 290                 if (verbose) {
 291                         if (exp->m_exported) {
 292                                 printf("unexporting %s:%s from kernel\n",
 293                                        exp->m_client->m_hostname,
 294                                        exp->m_export.e_path);
 295                         }
 296                         else {
 297                                 printf("unexporting %s:%s\n",
 298                                         exp->m_client->m_hostname,
 299                                         exp->m_export.e_path);
 300                         }
 301                 }
 302                 if (exp->m_exported && !export_unexport(exp))
 303                         error(exp, errno);
 304                 exp->m_xtabent = 0;
 305                 exp->m_mayexport = 0;
 306         }
 307
 308         if (hp) free (hp);
 309 }
 310
 311 static char
 312 dumpopt(char c, char *fmt, ...)
 313 {
 314         va_list ap;
 315
 316         va_start(ap, fmt);
 317         printf("%c", c);
 318         vprintf(fmt, ap);
 319         va_end(ap);
 320         return ',';
 321 }
 322
 323 static void
 324 dump(int verbose)
 325 {
 326         nfs_export      *exp;
 327         struct exportent *ep;
 328         int             htype;
 329         char            *hname, c;
 330
 331         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 332                 for (exp = exportlist[htype]; exp; exp = exp->m_next) {
 333                         ep = &exp->m_export;
 334                         if (!exp->m_xtabent)
 335                             continue; /* neilb */
 336                         if (htype == MCL_ANONYMOUS)
 337                                 hname = "<world>";
 338                         else
 339                                 hname = ep->e_hostname;
 340                         if (strlen(ep->e_path) > 14)
 341                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 342                         else
 343                                 printf("%-14s\t%s", ep->e_path, hname);
 344                         if (!verbose) {
 345                                 printf("\n");
 346                                 continue;
 347                         }
 348                         c = '(';
 349                         if (ep->e_flags & NFSEXP_READONLY)
 350                                 c = dumpopt(c, "ro");
 351                         else
 352                                 c = dumpopt(c, "rw");
 353                         if (ep->e_flags & NFSEXP_ASYNC)
 354                                 c = dumpopt(c, "async");
 355                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 356                                 c = dumpopt(c, "wdelay");
 357                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 358                                 c = dumpopt(c, "insecure");
 359                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 360                                 c = dumpopt(c, "root_squash");
 361                         else
 362                                 c = dumpopt(c, "no_root_squash");
 363                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 364                                 c = dumpopt(c, "all_squash");
 365                         if (ep->e_maptype == CLE_MAP_UGIDD)
 366                                 c = dumpopt(c, "mapping=ugidd");
 367                         else if (ep->e_maptype == CLE_MAP_FILE)
 368                                 c = dumpopt(c, "mapping=file");
 369                         if (ep->e_anonuid != -2)
 370                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 371                         if (ep->e_anongid != -2)
 372                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 373
 374                         printf("%c\n", (c != '(')? ')' : ' ');
 375                 }
 376         }
 377 }
 378
 379 static void
 380 error(nfs_export *exp, int err)
 381 {
 382         fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
 383                 exp->m_export.e_path, strerror(err));
 384 }
 385
 386 static void
 387 usage(void)
 388 {
 389         fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
 390         exit(1);
 391 }