nis/nis_file.c

   1 /* Copyright (c) 1997-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <rpcsvc/nis.h>
  22 #include <shlib-compat.h>
  23 #include "nis_xdr.h"
  24
  25 typedef bool_t (*iofct_t) (XDR *, void *);
  26 typedef void (*freefct_t) (void *);
  27
  28
  29 static void *
  30 read_nis_obj (const char *name, iofct_t readfct, freefct_t freefct,
  31               size_t objsize)
  32 {
  33   FILE *in = fopen (name, "rce");
  34   if (in == NULL)
  35     return NULL;
  36
  37   void *obj = calloc (1, objsize);
  38
  39   if (obj != NULL)
  40     {
  41       XDR xdrs;
  42       xdrstdio_create (&xdrs, in, XDR_DECODE);
  43       bool_t status = readfct (&xdrs, obj);
  44       xdr_destroy (&xdrs);
  45
  46       if (!status)
  47         {
  48           freefct (obj);
  49           obj = NULL;
  50         }
  51     }
  52
  53   fclose (in);
  54
  55   return obj;
  56 }
  57
  58 static bool_t
  59 write_nis_obj (const char *name, const void *obj, iofct_t writefct)
  60 {
  61   FILE *out = fopen (name, "wce");
  62   if (out == NULL)
  63     return FALSE;
  64
  65   XDR xdrs;
  66   xdrstdio_create (&xdrs, out, XDR_ENCODE);
  67   bool_t status = writefct (&xdrs, (void *) obj);
  68   xdr_destroy (&xdrs);
  69   fclose (out);
  70
  71   return status;
  72 }
  73
  74
  75 static const char cold_start_file[] = "/var/nis/NIS_COLD_START";
  76
  77 directory_obj *
  78 readColdStartFile (void)
  79 {
  80   return read_nis_obj (cold_start_file, (iofct_t) _xdr_directory_obj,
  81                        (freefct_t) nis_free_directory, sizeof (directory_obj));
  82 }
  83 libnsl_hidden_nolink_def (readColdStartFile, GLIBC_2_1)
  84
  85 bool_t
  86 writeColdStartFile (const directory_obj *obj)
  87 {
  88   return write_nis_obj (cold_start_file, obj, (iofct_t) _xdr_directory_obj);
  89 }
  90 libnsl_hidden_nolink_def (writeColdStartFile, GLIBC_2_1)
  91
  92 nis_object *
  93 nis_read_obj (const char *name)
  94 {
  95   return read_nis_obj (name, (iofct_t) _xdr_nis_object,
  96                        (freefct_t) nis_free_object, sizeof (nis_object));
  97 }
  98 libnsl_hidden_nolink_def (nis_read_obj, GLIBC_2_1)
  99
 100 bool_t
 101 nis_write_obj (const char *name, const nis_object *obj)
 102 {
 103   return write_nis_obj (name, obj, (iofct_t) _xdr_nis_object);
 104 }
 105 libnsl_hidden_nolink_def (nis_write_obj, GLIBC_2_1)