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