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 /*
  23  * See if the entry already exists.  If not,
  24  * this was an instantiated wild card, and we
  25  * must add it.
  26  */
  27 static void
  28 rmtab_read_wildcard(struct rmtabent *rep)
  29 {
  30         nfs_export *exp, *exp2;
  31         struct hostent *hp;
  32
  33         hp = gethostbyname(rep->r_client);
  34         if (hp == NULL)
  35                 return;
  36         hp = hostent_dup(hp);
  37         if (hp == NULL)
  38                 return;
  39
  40         exp = export_allowed(hp, rep->r_path);
  41         free(hp);
  42         if (exp == NULL)
  43                 return;
  44
  45         exp2 = export_lookup(rep->r_client, exp->m_export.e_path, 0);
  46         if (exp2 == NULL) {
  47                 struct exportent ee;
  48
  49                 memset(&ee, 0, sizeof(ee));
  50                 dupexportent(&ee, &exp->m_export);
  51
  52                 ee.e_hostname = rep->r_client;
  53                 exp2 = export_create(&ee, 0);
  54                 exp2->m_changed = exp->m_changed;
  55         }
  56         exp2->m_mayexport = 1;
  57 }
  58
  59 int
  60 rmtab_read(void)
  61 {
  62         struct rmtabent         *rep;
  63
  64         setrmtabent("r");
  65         while ((rep = getrmtabent(1, NULL)) != NULL) {
  66                 int                     htype;
  67
  68                 htype = client_gettype(rep->r_client);
  69                 if (htype == MCL_FQDN || htype == MCL_SUBNETWORK)
  70                         rmtab_read_wildcard(rep);
  71         }
  72
  73         if (errno == EINVAL) {
  74                 /* Something goes wrong. We need to fix the rmtab
  75                    file. */
  76                 int     lockid;
  77                 FILE    *fp;
  78                 if ((lockid = xflock(_PATH_RMTABLCK, "w")) < 0)
  79                         return -1;
  80                 rewindrmtabent();
  81                 if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
  82                         endrmtabent ();
  83                         xfunlock(lockid);
  84                         return -1;
  85                 }
  86                 while ((rep = getrmtabent(0, NULL)) != NULL) {
  87                         fputrmtabent(fp, rep, NULL);
  88                 }
  89                 if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
  90                         xlog(L_ERROR, "couldn't rename %s to %s",
  91                              _PATH_RMTABTMP, _PATH_RMTAB);
  92                 }
  93                 endrmtabent();
  94                 fendrmtabent(fp);
  95                 xfunlock(lockid);
  96         }
  97         else {
  98                 endrmtabent();
  99         }
 100         return 0;
 101 }