nis/nis_file.c

   1 /* Copyright (c) 1997-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <rpcsvc/nis.h>
  23 #include <shlib-compat.h>
  24 #include "nis_xdr.h"
  25
  26 typedef bool_t (*iofct_t) (XDR *, void *);
  27 typedef void (*freefct_t) (void *);
  28
  29
  30 static void *
  31 read_nis_obj (const char *name, iofct_t readfct, freefct_t freefct,
  32               size_t objsize)
  33 {
  34   FILE *in = fopen (name, "rce");
  35   if (in == NULL)
  36     return NULL;
  37
  38   void *obj = calloc (1, objsize);
  39
  40   if (obj != NULL)
  41     {
  42       XDR xdrs;
  43       xdrstdio_create (&xdrs, in, XDR_DECODE);
  44       bool_t status = readfct (&xdrs, obj);
  45       xdr_destroy (&xdrs);
  46
  47       if (!status)
  48         {
  49           freefct (obj);
  50           obj = NULL;
  51         }
  52     }
  53
  54   fclose (in);
  55
  56   return obj;
  57 }
  58
  59 static bool_t
  60 write_nis_obj (const char *name, const void *obj, iofct_t writefct)
  61 {
  62   FILE *out = fopen (name, "wce");
  63   if (out == NULL)
  64     return FALSE;
  65
  66   XDR xdrs;
  67   xdrstdio_create (&xdrs, out, XDR_ENCODE);
  68   bool_t status = writefct (&xdrs, (void *) obj);
  69   xdr_destroy (&xdrs);
  70   fclose (out);
  71
  72   return status;
  73 }
  74
  75
  76 static const char cold_start_file[] = "/var/nis/NIS_COLD_START";
  77
  78 directory_obj *
  79 readColdStartFile (void)
  80 {
  81   return read_nis_obj (cold_start_file, (iofct_t) _xdr_directory_obj,
  82                        (freefct_t) nis_free_directory, sizeof (directory_obj));
  83 }
  84 libnsl_hidden_nolink_def (readColdStartFile, GLIBC_2_1)
  85
  86 bool_t
  87 writeColdStartFile (const directory_obj *obj)
  88 {
  89   return write_nis_obj (cold_start_file, obj, (iofct_t) _xdr_directory_obj);
  90 }
  91 libnsl_hidden_nolink_def (writeColdStartFile, GLIBC_2_1)
  92
  93 nis_object *
  94 nis_read_obj (const char *name)
  95 {
  96   return read_nis_obj (name, (iofct_t) _xdr_nis_object,
  97                        (freefct_t) nis_free_object, sizeof (nis_object));
  98 }
  99 libnsl_hidden_nolink_def (nis_read_obj, GLIBC_2_1)
 100
 101 bool_t
 102 nis_write_obj (const char *name, const nis_object *obj)
 103 {
 104   return write_nis_obj (name, obj, (iofct_t) _xdr_nis_object);
 105 }
 106 libnsl_hidden_nolink_def (nis_write_obj, GLIBC_2_1)