nis/nss_nisplus/nisplus-spwd.c

   1 /* Copyright (C) 1997-2016 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <nss.h>
  20 #include <errno.h>
  21 #include <shadow.h>
  22 #include <string.h>
  23 #include <libc-lock.h>
  24 #include <rpcsvc/nis.h>
  25
  26 #include "nss-nisplus.h"
  27 #include "nisplus-parser.h"
  28
  29 __libc_lock_define_initialized (static, lock)
  30
  31 static nis_result *result;
  32
  33 /* Defined in nisplus-pwd.c.  */
  34 extern nis_name pwd_tablename_val attribute_hidden;
  35 extern size_t pwd_tablename_len attribute_hidden;
  36 extern enum nss_status _nss_pwd_create_tablename (int *errnop);
  37
  38
  39 enum nss_status
  40 _nss_nisplus_setspent (int stayopen)
  41 {
  42   enum nss_status status = NSS_STATUS_SUCCESS;
  43   int err;
  44
  45   __libc_lock_lock (lock);
  46
  47   if (result != NULL)
  48     {
  49       nis_freeresult (result);
  50       result = NULL;
  51     }
  52
  53   if (pwd_tablename_val == NULL)
  54     status = _nss_pwd_create_tablename (&err);
  55
  56   __libc_lock_unlock (lock);
  57
  58   return status;
  59 }
  60
  61 enum nss_status
  62 _nss_nisplus_endspent (void)
  63 {
  64   __libc_lock_lock (lock);
  65
  66   if (result != NULL)
  67     {
  68       nis_freeresult (result);
  69       result = NULL;
  70     }
  71
  72   __libc_lock_unlock (lock);
  73
  74   return NSS_STATUS_SUCCESS;
  75 }
  76
  77 static enum nss_status
  78 internal_nisplus_getspent_r (struct spwd *sp, char *buffer, size_t buflen,
  79                              int *errnop)
  80 {
  81   int parse_res;
  82
  83   /* Get the next entry until we found a correct one. */
  84   do
  85     {
  86       nis_result *saved_res;
  87
  88       if (result == NULL)
  89         {
  90           saved_res = NULL;
  91
  92           if (pwd_tablename_val == NULL)
  93             {
  94               enum nss_status status = _nss_pwd_create_tablename (errnop);
  95
  96               if (status != NSS_STATUS_SUCCESS)
  97                 return status;
  98             }
  99
 100           result = nis_first_entry (pwd_tablename_val);
 101           if (result == NULL)
 102             {
 103               *errnop = errno;
 104               return NSS_STATUS_TRYAGAIN;
 105             }
 106           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 107             return niserr2nss (result->status);
 108         }
 109       else
 110         {
 111           saved_res = result;
 112           result = nis_next_entry (pwd_tablename_val, &result->cookie);
 113           if (result == NULL)
 114             {
 115               *errnop = errno;
 116               return NSS_STATUS_TRYAGAIN;
 117             }
 118           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 119             {
 120               nis_freeresult (saved_res);
 121               return niserr2nss (result->status);
 122             }
 123         }
 124
 125       parse_res = _nss_nisplus_parse_spent (result, sp, buffer,
 126                                             buflen, errnop);
 127       if (__glibc_unlikely (parse_res == -1))
 128         {
 129           nis_freeresult (result);
 130           result = saved_res;
 131           *errnop = ERANGE;
 132           return NSS_STATUS_TRYAGAIN;
 133         }
 134
 135       if (saved_res != NULL)
 136         nis_freeresult (saved_res);
 137     }
 138   while (!parse_res);
 139
 140   return NSS_STATUS_SUCCESS;
 141 }
 142
 143 enum nss_status
 144 _nss_nisplus_getspent_r (struct spwd *result, char *buffer, size_t buflen,
 145                          int *errnop)
 146 {
 147   int status;
 148
 149   __libc_lock_lock (lock);
 150
 151   status = internal_nisplus_getspent_r (result, buffer, buflen, errnop);
 152
 153   __libc_lock_unlock (lock);
 154
 155   return status;
 156 }
 157
 158 enum nss_status
 159 _nss_nisplus_getspnam_r (const char *name, struct spwd *sp,
 160                      char *buffer, size_t buflen, int *errnop)
 161 {
 162   int parse_res;
 163
 164   if (pwd_tablename_val == NULL)
 165     {
 166       enum nss_status status = _nss_pwd_create_tablename (errnop);
 167
 168       if (status != NSS_STATUS_SUCCESS)
 169         return status;
 170     }
 171
 172   if (name == NULL)
 173     {
 174       *errnop = EINVAL;
 175       return NSS_STATUS_NOTFOUND;
 176     }
 177
 178   nis_result *result;
 179   char buf[strlen (name) + 9 + pwd_tablename_len];
 180   int olderr = errno;
 181
 182   snprintf (buf, sizeof (buf), "[name=%s],%s", name, pwd_tablename_val);
 183
 184   result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, NULL, NULL);
 185
 186   if (result == NULL)
 187     {
 188       *errnop = ENOMEM;
 189       return NSS_STATUS_TRYAGAIN;
 190     }
 191
 192   if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
 193     {
 194       enum nss_status status = niserr2nss (result->status);
 195
 196       __set_errno (olderr);
 197
 198       nis_freeresult (result);
 199       return status;
 200     }
 201
 202   parse_res = _nss_nisplus_parse_spent (result, sp, buffer, buflen, errnop);
 203   nis_freeresult (result);
 204
 205   if (__glibc_unlikely (parse_res < 1))
 206     {
 207       if (parse_res == -1)
 208         {
 209           *errnop = ERANGE;
 210           return NSS_STATUS_TRYAGAIN;
 211         }
 212       else
 213         {
 214           __set_errno (olderr);
 215           return NSS_STATUS_NOTFOUND;
 216         }
 217     }
 218
 219   return NSS_STATUS_SUCCESS;
 220 }