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) {
  28                 exp = export_lookup(rep->r_client, rep->r_path);
  29                 if (!exp) {
  30                         struct exportent        *xp;
  31                         struct hostent          *hp;
  32                         int                     htype;
  33
  34                         htype = client_gettype(rep->r_client);
  35                         if (htype == MCL_FQDN
  36                             && (hp = gethostbyname (rep->r_client), hp)
  37                             && (hp = hostent_dup (hp),
  38                                    xp = export_allowed (hp, rep->r_path))) {
  39                                 strncpy (xp->e_hostname, rep->r_client,
  40                                          sizeof (xp->e_hostname) - 1);
  41                                 xp->e_hostname[sizeof (xp->e_hostname) -1] = '\0';
  42                                 exp = export_create(xp);
  43                                 free (hp);
  44                         }
  45
  46                         if (!exp)
  47                                 continue;
  48                         exp->m_mayexport = 1;
  49                 }
  50         }
  51         if (errno == EINVAL) {
  52                 /* Something goes wrong. We need to fix the rmtab
  53                    file. */
  54                 int     lockid;
  55                 FILE    *fp;
  56                 if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
  57                         return -1;
  58                 rewindrmtabent();
  59                 if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
  60                         endrmtabent ();
  61                         xfunlock(lockid);
  62                         return -1;
  63                 }
  64                 while ((rep = getrmtabent(0)) != NULL) {
  65                         fputrmtabent(fp, rep);
  66                 }
  67                 if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
  68                         xlog(L_ERROR, "couldn't rename %s to %s",
  69                              _PATH_RMTABTMP, _PATH_RMTAB);
  70                 }
  71                 endrmtabent();
  72                 fendrmtabent(fp);
  73                 xfunlock(lockid);
  74         }
  75         else {
  76                 endrmtabent();
  77         }
  78         return 0;
  79 }