support/export/rmtab.c

   1 /*
   2  * support/export/rmntab.c
   3  *
   4  * Interface to the rmnt file.
   5  *
   6  */
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include <config.h>
  10 #endif
  11
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include "xmalloc.h"
  16 #include "misc.h"
  17 #include "nfslib.h"
  18 #include "exportfs.h"
  19 #include "xio.h"
  20 #include "xlog.h"
  21
  22 int
  23 rmtab_read(void)
  24 {
  25         struct rmtabent         *rep;
  26         nfs_export              *exp;
  27
  28         setrmtabent("r");
  29         while ((rep = getrmtabent(1, NULL)) != NULL) {
  30                 struct hostent          *hp = NULL;
  31                 int                     htype;
  32
  33                 htype = client_gettype(rep->r_client);
  34                 if (htype == MCL_FQDN
  35                     && (hp = gethostbyname (rep->r_client))
  36                     && (hp = hostent_dup (hp),
  37                         exp = export_allowed (hp, rep->r_path))) {
  38                         /* see if the entry already exists, otherwise this was an instantiated
  39                          * wild card, and we must add it
  40                          */
  41                         nfs_export *exp2 = export_lookup(rep->r_client,
  42                                                         exp->m_export.e_path, 0);
  43                         if (!exp2) {
  44                                 struct exportent ee;
  45                                 dupexportent(&ee, &exp->m_export);
  46                                 strncpy (ee.e_hostname, rep->r_client,
  47                                          sizeof (ee.e_hostname) - 1);
  48                                 ee.e_hostname[sizeof (ee.e_hostname) -1] = '\0';
  49                                 exp2 = export_create(&ee, 0);
  50                                 exp2->m_changed = exp->m_changed;
  51                         }
  52                         free (hp);
  53                         exp2->m_mayexport = 1;
  54                 } else if (hp) /* export_allowed failed */
  55                         free(hp);
  56         }
  57         if (errno == EINVAL) {
  58                 /* Something goes wrong. We need to fix the rmtab
  59                    file. */
  60                 int     lockid;
  61                 FILE    *fp;
  62                 if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
  63                         return -1;
  64                 rewindrmtabent();
  65                 if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
  66                         endrmtabent ();
  67                         xfunlock(lockid);
  68                         return -1;
  69                 }
  70                 while ((rep = getrmtabent(0, NULL)) != NULL) {
  71                         fputrmtabent(fp, rep, NULL);
  72                 }
  73                 if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
  74                         xlog(L_ERROR, "couldn't rename %s to %s",
  75                              _PATH_RMTABTMP, _PATH_RMTAB);
  76                 }
  77                 endrmtabent();
  78                 fendrmtabent(fp);
  79                 xfunlock(lockid);
  80         }
  81         else {
  82                 endrmtabent();
  83         }
  84         return 0;
  85 }