nis/nss_nisplus/nisplus-netgrp.c

   1 /* Copyright (C) 1997, 2003, 2004, 2005, 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>, 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 <rpcsvc/nis.h>
  27
  28 #include "nss-nisplus.h"
  29
  30 #define NISENTRYVAL(idx, col, res) \
  31         (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
  32
  33 #define NISENTRYLEN(idx, col, res) \
  34         (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
  35
  36 enum nss_status
  37 _nss_nisplus_getnetgrent_r (struct __netgrent *result, char *buffer,
  38                             size_t buflen, int *errnop)
  39 {
  40   enum nss_status status;
  41
  42   /* Some sanity checks.  */
  43   if (result->data == NULL || result->data_size == 0)
  44     return NSS_STATUS_NOTFOUND;
  45
  46   if (result->position == result->data_size)
  47     return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
  48
  49   unsigned int entrylen
  50     = NISENTRYLEN (result->position, 1, (nis_result *) result->data);
  51   if (entrylen > 0)
  52     {
  53       /* We have a list of other netgroups.  */
  54
  55       result->type = group_val;
  56       if (entrylen >= buflen)
  57         {
  58           *errnop = ERANGE;
  59           return NSS_STATUS_TRYAGAIN;
  60         }
  61       strncpy (buffer, NISENTRYVAL (result->position, 1,
  62                                     (nis_result *) result->data),
  63                entrylen);
  64       buffer[entrylen] = '\0';
  65       result->val.group = buffer;
  66       ++result->position;
  67       result->first = 0;
  68
  69       return NSS_STATUS_SUCCESS;
  70     }
  71
  72   /* Before we can copy the entry to the private buffer we have to make
  73      sure it is big enough.  */
  74   unsigned int hostlen
  75     = NISENTRYLEN (result->position, 2, (nis_result *) result->data);
  76   unsigned int userlen
  77     = NISENTRYLEN (result->position, 3, (nis_result *) result->data);
  78   unsigned int domainlen
  79     = NISENTRYLEN (result->position, 4, (nis_result *) result->data);
  80   if (hostlen + userlen + domainlen + 6 > buflen)
  81     {
  82       *errnop = ERANGE;
  83       status = NSS_STATUS_TRYAGAIN;
  84     }
  85   else
  86     {
  87       char *cp = buffer;
  88
  89       result->type = triple_val;
  90
  91       if (hostlen == 0 ||
  92           NISENTRYVAL (result->position, 2,
  93                        (nis_result *) result->data)[0] == '\0')
  94         result->val.triple.host = NULL;
  95       else
  96         {
  97           result->val.triple.host = cp;
  98           cp = __stpncpy (cp, NISENTRYVAL (result->position, 2,
  99                                            (nis_result *) result->data),
 100                           hostlen);
 101           *cp++ = '\0';
 102         }
 103
 104       if (userlen == 0 ||
 105           NISENTRYVAL (result->position, 3,
 106                        (nis_result *) result->data)[0] == '\0')
 107         result->val.triple.user = NULL;
 108       else
 109         {
 110           result->val.triple.user = cp;
 111           cp = __stpncpy (cp, NISENTRYVAL (result->position, 3,
 112                                            (nis_result *) result->data),
 113                           userlen);
 114           *cp++ = '\0';
 115         }
 116
 117       if (domainlen == 0 ||
 118           NISENTRYVAL (result->position, 4,
 119                        (nis_result *) result->data)[0] == '\0')
 120         result->val.triple.domain = NULL;
 121       else
 122         {
 123           result->val.triple.domain = cp;
 124           cp = __stpncpy (cp, NISENTRYVAL (result->position, 4,
 125                                            (nis_result *) result->data),
 126                           domainlen);
 127           *cp = '\0';
 128         }
 129
 130       status = NSS_STATUS_SUCCESS;
 131
 132       /* Remember where we stopped reading.  */
 133       ++result->position;
 134
 135       result->first = 0;
 136     }
 137
 138   return status;
 139 }
 140
 141 static void
 142 internal_endnetgrent (struct __netgrent *netgrp)
 143 {
 144   nis_freeresult ((nis_result *) netgrp->data);
 145   netgrp->data = NULL;
 146   netgrp->data_size = 0;
 147   netgrp->position = 0;
 148 }
 149
 150 enum nss_status
 151 _nss_nisplus_setnetgrent (const char *group, struct __netgrent *netgrp)
 152 {
 153   char buf[strlen (group) + 25];
 154
 155   if (group == NULL || group[0] == '\0')
 156     return NSS_STATUS_UNAVAIL;
 157
 158   enum nss_status status = NSS_STATUS_SUCCESS;
 159
 160   snprintf (buf, sizeof (buf), "[name=%s],netgroup.org_dir", group);
 161
 162   netgrp->data = (char *) nis_list (buf, EXPAND_NAME, NULL, NULL);
 163
 164   if (netgrp->data == NULL)
 165     {
 166       __set_errno (ENOMEM);
 167       status = NSS_STATUS_TRYAGAIN;
 168     }
 169   else if (niserr2nss (((nis_result *) netgrp->data)->status)
 170            != NSS_STATUS_SUCCESS)
 171     {
 172       status = niserr2nss (((nis_result *) netgrp->data)->status);
 173
 174       internal_endnetgrent (netgrp);
 175     }
 176   else
 177     {
 178       netgrp->data_size = ((nis_result *) netgrp->data)->objects.objects_len;
 179       netgrp->position = 0;
 180       netgrp->first = 1;
 181     }
 182
 183   return status;
 184 }
 185
 186 enum nss_status
 187 _nss_nisplus_endnetgrent (struct __netgrent *netgrp)
 188 {
 189   internal_endnetgrent (netgrp);
 190
 191   return NSS_STATUS_SUCCESS;
 192 }