support/export/rmtab.c

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