nis/nss_nisplus/nisplus-netgrp.c

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <nss.h>
  21 #include <errno.h>
  22 #include <ctype.h>
  23 #include <netdb.h>
  24 #include <string.h>
  25 #include <netgroup.h>
  26 #include <bits/libc-lock.h>
  27 #include <rpcsvc/nis.h>
  28
  29 #include "nss-nisplus.h"
  30
  31 __libc_lock_define_initialized (static, lock)
  32
  33 static nis_result *data = NULL;
  34 static unsigned long data_size = 0;
  35 static unsigned long position = 0;
  36
  37 #define NISENTRYVAL(idx,col,res) \
  38         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
  39
  40 #define NISENTRYLEN(idx,col,res) \
  41         ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  42
  43 static enum nss_status
  44 _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
  45                              size_t buflen, int *errnop)
  46 {
  47   enum nss_status status;
  48
  49   /* Some sanity checks.  */
  50   if (data == NULL || data_size == 0)
  51     return NSS_STATUS_NOTFOUND;
  52
  53   if (position == data_size)
  54     return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
  55
  56   if (NISENTRYLEN (position, 1, data) > 0)
  57     {
  58       /* We have a list of other netgroups.  */
  59
  60       result->type = group_val;
  61       if (NISENTRYLEN (position, 1, data) >= buflen)
  62         {
  63           *errnop = ERANGE;
  64           return NSS_STATUS_TRYAGAIN;
  65         }
  66       strncpy (buffer, NISENTRYVAL (position, 1, data),
  67                NISENTRYLEN (position, 1, data));
  68       buffer[NISENTRYLEN (position, 1, data)] = '\0';
  69       result->val.group = buffer;
  70       ++position;
  71       result->first = 0;
  72
  73       return NSS_STATUS_SUCCESS;
  74     }
  75
  76   /* Before we can copy the entry to the private buffer we have to make
  77      sure it is big enough.  */
  78   if (NISENTRYLEN (position, 2, data) + NISENTRYLEN (position, 3, data) +
  79       NISENTRYLEN (position, 4, data) + 6 > buflen)
  80     {
  81       *errnop = ERANGE;
  82       status = NSS_STATUS_TRYAGAIN;
  83     }
  84   else
  85     {
  86       char *cp = buffer;
  87
  88       result->type = triple_val;
  89
  90       if (NISENTRYLEN (position, 2, data) == 0)
  91         result->val.triple.host = NULL;
  92       else
  93         {
  94           result->val.triple.host = cp;
  95           cp = __stpncpy (cp, NISENTRYVAL (position, 2, data),
  96                           NISENTRYLEN (position, 2, data));
  97           *cp++ = '\0';
  98         }
  99
 100       if (NISENTRYLEN (position, 3, data) == 0)
 101         result->val.triple.user = NULL;
 102       else
 103         {
 104           result->val.triple.user = cp;
 105           cp = __stpncpy (cp, NISENTRYVAL (position, 3, data),
 106                           NISENTRYLEN (position, 3, data));
 107           *cp++ = '\0';
 108         }
 109
 110       if (NISENTRYLEN (position, 4, data) == 0)
 111         result->val.triple.domain = NULL;
 112       else
 113         {
 114           result->val.triple.domain = cp;
 115           cp = __stpncpy (cp, NISENTRYVAL (position, 4, data),
 116                           NISENTRYLEN (position, 4, data));
 117           *cp = '\0';
 118         }
 119
 120       status = NSS_STATUS_SUCCESS;
 121
 122       /* Remember where we stopped reading.  */
 123       ++position;
 124
 125       result->first = 0;
 126     }
 127
 128   return status;
 129 }
 130
 131 enum nss_status
 132 _nss_nisplus_setnetgrent (const char *group, struct __netgrent *dummy)
 133 {
 134   enum nss_status status;
 135   char buf[strlen (group) + 30];
 136
 137   if (group == NULL || group[0] == '\0')
 138     return NSS_STATUS_UNAVAIL;
 139
 140   status = NSS_STATUS_SUCCESS;
 141
 142   __libc_lock_lock (lock);
 143
 144   if (data != NULL)
 145     {
 146       nis_freeresult (data);
 147       data = NULL;
 148       data_size = 0;
 149       position = 0;
 150     }
 151
 152   sprintf (buf, "[name=%s],netgroup.org_dir", group);
 153
 154   data = nis_list (buf, EXPAND_NAME, NULL, NULL);
 155
 156   if (niserr2nss (data->status) != NSS_STATUS_SUCCESS)
 157     {
 158       status = niserr2nss (data->status);
 159       nis_freeresult (data);
 160       data = NULL;
 161     }
 162   else
 163     data_size = data->objects.objects_len;
 164
 165   __libc_lock_unlock (lock);
 166
 167   return status;
 168 }
 169
 170 enum nss_status
 171 _nss_nisplus_endnetgrent (struct __netgrent *dummy)
 172 {
 173   __libc_lock_lock (lock);
 174
 175   if (data != NULL)
 176     {
 177       nis_freeresult (data);
 178       data = NULL;
 179       data_size = 0;
 180       position = 0;
 181     }
 182
 183   __libc_lock_unlock (lock);
 184
 185   return NSS_STATUS_SUCCESS;
 186 }
 187
 188 enum nss_status
 189 _nss_nisplus_getnetgrent_r (struct __netgrent *result,
 190                             char *buffer, size_t buflen, int *errnop)
 191 {
 192   enum nss_status status;
 193
 194   __libc_lock_lock (lock);
 195
 196   status = _nss_nisplus_parse_netgroup (result, buffer, buflen, errnop);
 197
 198   __libc_lock_unlock (lock);
 199
 200   return status;
 201 }