nis/nss_nis/nis-spwd.c

   1 /* Copyright (C) 1996-1998,2001,2002,2003,2006 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   char *domain;
  72   if (__builtin_expect (yp_get_default_domain (&domain), 0))
  73     return NSS_STATUS_UNAVAIL;
  74
  75   /* Get the next entry until we found a correct one. */
  76   int parse_res;
  77   do
  78     {
  79       char *result;
  80       char *outkey;
  81       int len;
  82       int keylen;
  83       int yperr;
  84
  85       if (new_start)
  86         yperr = yp_first (domain, "shadow.byname", &outkey, &keylen, &result,
  87                           &len);
  88       else
  89         yperr = yp_next (domain, "shadow.byname", oldkey, oldkeylen, &outkey,
  90                          &keylen, &result, &len);
  91
  92       if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
  93         {
  94           enum nss_status retval = yperr2nss (yperr);
  95
  96           if (retval == NSS_STATUS_TRYAGAIN)
  97             *errnop = errno;
  98           return retval;
  99         }
 100
 101       if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 102         {
 103           free (result);
 104           *errnop = ERANGE;
 105           return NSS_STATUS_TRYAGAIN;
 106         }
 107
 108       char *p = strncpy (buffer, result, len);
 109       buffer[len] = '\0';
 110       while (isspace (*p))
 111         ++p;
 112       free (result);
 113
 114       parse_res = _nss_files_parse_spent (p, sp, (void *) buffer, buflen,
 115                                           errnop);
 116       if (__builtin_expect  (parse_res == -1, 0))
 117         {
 118           free (outkey);
 119           *errnop = ERANGE;
 120           return NSS_STATUS_TRYAGAIN;
 121         }
 122
 123       free (oldkey);
 124       oldkey = outkey;
 125       oldkeylen = keylen;
 126       new_start = 0;
 127     }
 128   while (!parse_res);
 129
 130   return NSS_STATUS_SUCCESS;
 131 }
 132
 133 enum nss_status
 134 _nss_nis_getspent_r (struct spwd *result, char *buffer, size_t buflen,
 135                      int *errnop)
 136 {
 137   int status;
 138
 139   __libc_lock_lock (lock);
 140
 141   status = internal_nis_getspent_r (result, buffer, buflen, errnop);
 142
 143   __libc_lock_unlock (lock);
 144
 145   return status;
 146 }
 147
 148 enum nss_status
 149 _nss_nis_getspnam_r (const char *name, struct spwd *sp,
 150                      char *buffer, size_t buflen, int *errnop)
 151 {
 152   if (name == NULL)
 153     {
 154       *errnop = EINVAL;
 155       return NSS_STATUS_UNAVAIL;
 156     }
 157
 158   char *domain;
 159   if (__builtin_expect (yp_get_default_domain (&domain), 0))
 160     return NSS_STATUS_UNAVAIL;
 161
 162   char *result;
 163   int len;
 164   int yperr = yp_match (domain, "shadow.byname", name, strlen (name), &result,
 165                         &len);
 166
 167   if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
 168     {
 169       enum nss_status retval = yperr2nss (yperr);
 170
 171       if (retval == NSS_STATUS_TRYAGAIN)
 172         *errnop = errno;
 173       return retval;
 174     }
 175
 176   if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 177     {
 178       free (result);
 179       *errnop = ERANGE;
 180       return NSS_STATUS_TRYAGAIN;
 181     }
 182
 183   char *p = strncpy (buffer, result, len);
 184   buffer[len] = '\0';
 185   while (isspace (*p))
 186     ++p;
 187   free (result);
 188
 189   int parse_res = _nss_files_parse_spent (p, sp, (void *) buffer, buflen,
 190                                           errnop);
 191   if (__builtin_expect (parse_res < 1, 0))
 192     {
 193       if (parse_res == -1)
 194         return NSS_STATUS_TRYAGAIN;
 195       else
 196         return NSS_STATUS_NOTFOUND;
 197     }
 198   return NSS_STATUS_SUCCESS;
 199 }