nis/nis_removemember.c

   1 /* Copyright (c) 1997-2020 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <string.h>
  21 #include <rpcsvc/nis.h>
  22 #include <shlib-compat.h>
  23
  24 nis_error
  25 nis_removemember (const_nis_name member, const_nis_name group)
  26 {
  27   if (group != NULL && group[0] != '\0')
  28     {
  29       size_t grouplen = strlen (group);
  30       char buf[grouplen + 14 + NIS_MAXNAMELEN];
  31       char domainbuf[grouplen + 2];
  32       nis_result *res, *res2;
  33       nis_error status;
  34       char *cp, *cp2;
  35
  36       cp = rawmemchr (nis_leaf_of_r (group, buf, sizeof (buf) - 1), '\0');
  37       cp = stpcpy (cp, ".groups_dir");
  38       cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
  39       if (cp2 != NULL && cp2[0] != '\0')
  40         {
  41           cp = stpcpy (cp, ".");
  42           stpcpy (cp, cp2);
  43         }
  44       res = nis_lookup (buf, FOLLOW_LINKS | EXPAND_NAME);
  45       if (res == NULL)
  46         return NIS_NOMEMORY;
  47       if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  48         {
  49           status = NIS_RES_STATUS (res);
  50           nis_freeresult (res);
  51           return status;
  52         }
  53
  54       if (NIS_RES_NUMOBJ (res) != 1
  55           || __type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ)
  56         {
  57           nis_freeresult (res);
  58           return NIS_INVALIDOBJ;
  59         }
  60
  61       nis_name *gr_members_val
  62         = NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_val;
  63       u_int gr_members_len
  64         = NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len;
  65
  66       u_int j = 0;
  67       for (u_int i = 0; i < gr_members_len; ++i)
  68         if (strcmp (gr_members_val[i], member) != 0)
  69           gr_members_val[j++] = gr_members_val[i];
  70         else
  71           free (gr_members_val[i]);
  72
  73       /* There is no need to reallocate the gr_members_val array.  We
  74          just adjust the size to match the number of strings still in
  75          it.  Yes, xdr_array will use mem_free with a size parameter
  76          but this is mapped to a simple free call which determines the
  77          size of the block by itself.  */
  78       NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len = j;
  79
  80       cp = stpcpy (buf, NIS_RES_OBJECT (res)->zo_name);
  81       *cp++ = '.';
  82       strncpy (cp, NIS_RES_OBJECT (res)->zo_domain, NIS_MAXNAMELEN);
  83       res2 = nis_modify (buf, NIS_RES_OBJECT (res));
  84       status = NIS_RES_STATUS (res2);
  85       nis_freeresult (res);
  86       nis_freeresult (res2);
  87
  88       return status;
  89     }
  90   else
  91     return NIS_FAIL;
  92 }
  93 libnsl_hidden_nolink_def (nis_removemember, GLIBC_2_1)