nis/nss_nis/nis-spwd.c

   1 /* Copyright (C) 1996-1998, 2001, 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.
   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 <ctype.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 /* The following is an ugly trick to avoid a prototype declaration for
  25    _nss_nis_endspent.  */
  26 #define _nss_nis_endspent _nss_nis_endspent_XXX
  27 #include <shadow.h>
  28 #undef _nss_nis_endspent
  29 #include <bits/libc-lock.h>
  30 #include <rpcsvc/yp.h>
  31 #include <rpcsvc/ypclnt.h>
  32
  33 #include "nss-nis.h"
  34
  35 /* Get the declaration of the parser function.  */
  36 #define ENTNAME spent
  37 #define STRUCTURE spwd
  38 #define EXTERN_PARSER
  39 #include <nss/nss_files/files-parse.c>
  40
  41 /* Protect global state against multiple changers */
  42 __libc_lock_define_initialized (static, lock)
  43
  44 static bool_t new_start = 1;
  45 static char *oldkey;
  46 static int oldkeylen;
  47
  48 enum nss_status
  49 _nss_nis_setspent (int stayopen)
  50 {
  51   __libc_lock_lock (lock);
  52
  53   new_start = 1;
  54   free (oldkey);
  55   oldkey = NULL;
  56   oldkeylen = 0;
  57
  58   __libc_lock_unlock (lock);
  59
  60   return NSS_STATUS_SUCCESS;
  61 }
  62 /* Make _nss_nis_endspent an alias of _nss_nis_setspent.  We do this
  63    even though the prototypes don't match.  The argument of setspent
  64    is not used so this makes no difference.  */
  65 strong_alias (_nss_nis_setspent, _nss_nis_endspent)
  66
  67 static enum nss_status
  68 internal_nis_getspent_r (struct spwd *sp, char *buffer, size_t buflen,
  69                          int *errnop)
  70 {
  71   struct parser_data *data = (void *) buffer;
  72   char *domain, *result, *outkey;
  73   int len, keylen, parse_res;
  74
  75   if (yp_get_default_domain (&domain))
  76     return NSS_STATUS_UNAVAIL;
  77
  78   /* Get the next entry until we found a correct one. */
  79   do
  80     {
  81       enum nss_status retval;
  82       char *p;
  83
  84       if (new_start)
  85         retval = yperr2nss (yp_first (domain, "shadow.byname",
  86                                       &outkey, &keylen, &result, &len));
  87       else
  88         retval = yperr2nss ( yp_next (domain, "shadow.byname",
  89                                       oldkey, oldkeylen,
  90                                       &outkey, &keylen, &result, &len));
  91
  92       if (retval != NSS_STATUS_SUCCESS)
  93         {
  94           if (retval == NSS_STATUS_TRYAGAIN)
  95             *errnop = errno;
  96           return retval;
  97         }
  98
  99       if ((size_t) (len + 1) > buflen)
 100         {
 101           free (result);
 102           *errnop = ERANGE;
 103           return NSS_STATUS_TRYAGAIN;
 104         }
 105
 106       p = strncpy (buffer, result, len);
 107       buffer[len] = '\0';
 108       while (isspace (*p))
 109         ++p;
 110       free (result);
 111
 112       parse_res = _nss_files_parse_spent (p, sp, data, buflen, errnop);
 113       if (parse_res == -1)
 114         {
 115           free (outkey);
 116           *errnop = ERANGE;
 117           return NSS_STATUS_TRYAGAIN;
 118         }
 119
 120       free (oldkey);
 121       oldkey = outkey;
 122       oldkeylen = keylen;
 123       new_start = 0;
 124     }
 125   while (!parse_res);
 126
 127   return NSS_STATUS_SUCCESS;
 128 }
 129
 130 enum nss_status
 131 _nss_nis_getspent_r (struct spwd *result, char *buffer, size_t buflen,
 132                      int *errnop)
 133 {
 134   int status;
 135
 136   __libc_lock_lock (lock);
 137
 138   status = internal_nis_getspent_r (result, buffer, buflen, errnop);
 139
 140   __libc_lock_unlock (lock);
 141
 142   return status;
 143 }
 144
 145 enum nss_status
 146 _nss_nis_getspnam_r (const char *name, struct spwd *sp,
 147                      char *buffer, size_t buflen, int *errnop)
 148 {
 149   struct parser_data *data = (void *) buffer;
 150   enum nss_status retval;
 151   char *domain, *result, *p;
 152   int len, parse_res;
 153
 154   if (name == NULL)
 155     {
 156       *errnop = EINVAL;
 157       return NSS_STATUS_UNAVAIL;
 158     }
 159
 160   if (yp_get_default_domain (&domain))
 161     return NSS_STATUS_UNAVAIL;
 162
 163   retval = yperr2nss (yp_match (domain, "shadow.byname", name,
 164                                 strlen (name), &result, &len));
 165
 166   if (retval != NSS_STATUS_SUCCESS)
 167     {
 168       if (retval == NSS_STATUS_TRYAGAIN)
 169         *errnop = errno;
 170       return retval;
 171     }
 172
 173   if ((size_t) (len + 1) > buflen)
 174     {
 175       free (result);
 176       *errnop = ERANGE;
 177       return NSS_STATUS_TRYAGAIN;
 178     }
 179
 180   p = strncpy (buffer, result, len);
 181   buffer[len] = '\0';
 182   while (isspace (*p))
 183     ++p;
 184   free (result);
 185
 186   parse_res = _nss_files_parse_spent (p, sp, data, buflen, errnop);
 187   if (parse_res < 1)
 188     {
 189       if (parse_res == -1)
 190         return NSS_STATUS_TRYAGAIN;
 191       else
 192         return NSS_STATUS_NOTFOUND;
 193     }
 194   return NSS_STATUS_SUCCESS;
 195 }