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 addrinfo *ai;
  32
  33         ai = host_addrinfo(rep->r_client);
  34         if (ai == NULL)
  35                 return;
  36
  37         exp = export_allowed(ai, rep->r_path);
  38         freeaddrinfo(ai);
  39         if (exp == NULL)
  40                 return;
  41
  42         exp2 = export_lookup(rep->r_client, exp->m_export.e_path, 0);
  43         if (exp2 == NULL) {
  44                 struct exportent ee;
  45
  46                 memset(&ee, 0, sizeof(ee));
  47                 dupexportent(&ee, &exp->m_export);
  48
  49                 ee.e_hostname = rep->r_client;
  50                 exp2 = export_create(&ee, 0);
  51                 exp2->m_changed = exp->m_changed;
  52         }
  53         exp2->m_mayexport = 1;
  54 }
  55
  56 int
  57 rmtab_read(void)
  58 {
  59         struct rmtabent         *rep;
  60
  61         setrmtabent("r");
  62         while ((rep = getrmtabent(1, NULL)) != NULL) {
  63                 int                     htype;
  64
  65                 htype = client_gettype(rep->r_client);
  66                 if (htype == MCL_FQDN || htype == MCL_SUBNETWORK)
  67                         rmtab_read_wildcard(rep);
  68         }
  69
  70         if (errno == EINVAL) {
  71                 /* Something goes wrong. We need to fix the rmtab
  72                    file. */
  73                 int     lockid;
  74                 FILE    *fp;
  75                 if ((lockid = xflock(_PATH_RMTABLCK, "w")) < 0)
  76                         return -1;
  77                 rewindrmtabent();
  78                 if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
  79                         endrmtabent ();
  80                         xfunlock(lockid);
  81                         return -1;
  82                 }
  83                 while ((rep = getrmtabent(0, NULL)) != NULL) {
  84                         fputrmtabent(fp, rep, NULL);
  85                 }
  86                 if (rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
  87                         xlog(L_ERROR, "couldn't rename %s to %s",
  88                              _PATH_RMTABTMP, _PATH_RMTAB);
  89                 }
  90                 endrmtabent();
  91                 fendrmtabent(fp);
  92                 xfunlock(lockid);
  93         }
  94         else {
  95                 endrmtabent();
  96         }
  97         return 0;
  98 }