nis/nss_nisplus/nisplus-netgrp.c

   1 /* Copyright (C) 1997-2014 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 <ctype.h>
  22 #include <netdb.h>
  23 #include <string.h>
  24 #include <netgroup.h>
  25 #include <rpcsvc/nis.h>
  26
  27 #include "nss-nisplus.h"
  28
  29 #define NISENTRYVAL(idx, col, res) \
  30         (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
  31
  32 #define NISENTRYLEN(idx, col, res) \
  33         (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
  34
  35 enum nss_status
  36 _nss_nisplus_getnetgrent_r (struct __netgrent *result, char *buffer,
  37                             size_t buflen, int *errnop)
  38 {
  39   enum nss_status status;
  40
  41   /* Some sanity checks.  */
  42   if (result->data == NULL || result->data_size == 0)
  43     return NSS_STATUS_NOTFOUND;
  44
  45   if (result->position == result->data_size)
  46     return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
  47
  48   unsigned int entrylen
  49     = NISENTRYLEN (result->position, 1, (nis_result *) result->data);
  50   if (entrylen > 0)
  51     {
  52       /* We have a list of other netgroups.  */
  53
  54       result->type = group_val;
  55       if (entrylen >= buflen)
  56         {
  57           *errnop = ERANGE;
  58           return NSS_STATUS_TRYAGAIN;
  59         }
  60       strncpy (buffer, NISENTRYVAL (result->position, 1,
  61                                     (nis_result *) result->data),
  62                entrylen);
  63       buffer[entrylen] = '\0';
  64       result->val.group = buffer;
  65       ++result->position;
  66       result->first = 0;
  67
  68       return NSS_STATUS_SUCCESS;
  69     }
  70
  71   /* Before we can copy the entry to the private buffer we have to make
  72      sure it is big enough.  */
  73   unsigned int hostlen
  74     = NISENTRYLEN (result->position, 2, (nis_result *) result->data);
  75   unsigned int userlen
  76     = NISENTRYLEN (result->position, 3, (nis_result *) result->data);
  77   unsigned int domainlen
  78     = NISENTRYLEN (result->position, 4, (nis_result *) result->data);
  79   if (hostlen + userlen + domainlen + 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 (hostlen == 0 ||
  91           NISENTRYVAL (result->position, 2,
  92                        (nis_result *) result->data)[0] == '\0')
  93         result->val.triple.host = NULL;
  94       else
  95         {
  96           result->val.triple.host = cp;
  97           cp = __stpncpy (cp, NISENTRYVAL (result->position, 2,
  98                                            (nis_result *) result->data),
  99                           hostlen);
 100           *cp++ = '\0';
 101         }
 102
 103       if (userlen == 0 ||
 104           NISENTRYVAL (result->position, 3,
 105                        (nis_result *) result->data)[0] == '\0')
 106         result->val.triple.user = NULL;
 107       else
 108         {
 109           result->val.triple.user = cp;
 110           cp = __stpncpy (cp, NISENTRYVAL (result->position, 3,
 111                                            (nis_result *) result->data),
 112                           userlen);
 113           *cp++ = '\0';
 114         }
 115
 116       if (domainlen == 0 ||
 117           NISENTRYVAL (result->position, 4,
 118                        (nis_result *) result->data)[0] == '\0')
 119         result->val.triple.domain = NULL;
 120       else
 121         {
 122           result->val.triple.domain = cp;
 123           cp = __stpncpy (cp, NISENTRYVAL (result->position, 4,
 124                                            (nis_result *) result->data),
 125                           domainlen);
 126           *cp = '\0';
 127         }
 128
 129       status = NSS_STATUS_SUCCESS;
 130
 131       /* Remember where we stopped reading.  */
 132       ++result->position;
 133
 134       result->first = 0;
 135     }
 136
 137   return status;
 138 }
 139
 140 static void
 141 internal_endnetgrent (struct __netgrent *netgrp)
 142 {
 143   nis_freeresult ((nis_result *) netgrp->data);
 144   netgrp->data = NULL;
 145   netgrp->data_size = 0;
 146   netgrp->position = 0;
 147 }
 148
 149 enum nss_status
 150 _nss_nisplus_setnetgrent (const char *group, struct __netgrent *netgrp)
 151 {
 152   char buf[strlen (group) + 25];
 153
 154   if (group == NULL || group[0] == '\0')
 155     return NSS_STATUS_UNAVAIL;
 156
 157   enum nss_status status = NSS_STATUS_SUCCESS;
 158
 159   snprintf (buf, sizeof (buf), "[name=%s],netgroup.org_dir", group);
 160
 161   netgrp->data = (char *) nis_list (buf, EXPAND_NAME, NULL, NULL);
 162
 163   if (netgrp->data == NULL)
 164     {
 165       __set_errno (ENOMEM);
 166       status = NSS_STATUS_TRYAGAIN;
 167     }
 168   else if (niserr2nss (((nis_result *) netgrp->data)->status)
 169            != NSS_STATUS_SUCCESS)
 170     {
 171       status = niserr2nss (((nis_result *) netgrp->data)->status);
 172
 173       internal_endnetgrent (netgrp);
 174     }
 175   else
 176     {
 177       netgrp->data_size = ((nis_result *) netgrp->data)->objects.objects_len;
 178       netgrp->position = 0;
 179       netgrp->first = 1;
 180     }
 181
 182   return status;
 183 }
 184
 185 enum nss_status
 186 _nss_nisplus_endnetgrent (struct __netgrent *netgrp)
 187 {
 188   internal_endnetgrent (netgrp);
 189
 190   return NSS_STATUS_SUCCESS;
 191 }