nis/nis_removemember.c

   1 /* Copyright (c) 1997-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <assert.h>
  19 #include <string.h>
  20 #include <rpcsvc/nis.h>
  21 #include <shlib-compat.h>
  22
  23 nis_error
  24 nis_removemember (const_nis_name member, const_nis_name group)
  25 {
  26   if (group != NULL && group[0] != '\0')
  27     {
  28       size_t grouplen = strlen (group);
  29       char buf[grouplen + 14 + NIS_MAXNAMELEN];
  30       char domainbuf[grouplen + 2];
  31       nis_result *res, *res2;
  32       nis_error status;
  33       char *cp, *cp2;
  34
  35       cp = rawmemchr (nis_leaf_of_r (group, buf, sizeof (buf) - 1), '\0');
  36       cp = stpcpy (cp, ".groups_dir");
  37       cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
  38       if (cp2 != NULL && cp2[0] != '\0')
  39         {
  40           cp = stpcpy (cp, ".");
  41           stpcpy (cp, cp2);
  42         }
  43       res = nis_lookup (buf, FOLLOW_LINKS | EXPAND_NAME);
  44       if (res == NULL)
  45         return NIS_NOMEMORY;
  46       if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  47         {
  48           status = NIS_RES_STATUS (res);
  49           nis_freeresult (res);
  50           return status;
  51         }
  52
  53       if (NIS_RES_NUMOBJ (res) != 1
  54           || __type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ)
  55         {
  56           nis_freeresult (res);
  57           return NIS_INVALIDOBJ;
  58         }
  59
  60       nis_name *gr_members_val
  61         = NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_val;
  62       u_int gr_members_len
  63         = NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len;
  64
  65       u_int j = 0;
  66       for (u_int i = 0; i < gr_members_len; ++i)
  67         if (strcmp (gr_members_val[i], member) != 0)
  68           gr_members_val[j++] = gr_members_val[i];
  69         else
  70           free (gr_members_val[i]);
  71
  72       /* There is no need to reallocate the gr_members_val array.  We
  73          just adjust the size to match the number of strings still in
  74          it.  Yes, xdr_array will use mem_free with a size parameter
  75          but this is mapped to a simple free call which determines the
  76          size of the block by itself.  */
  77       NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len = j;
  78
  79       cp = stpcpy (buf, NIS_RES_OBJECT (res)->zo_name);
  80       *cp++ = '.';
  81       strncpy (cp, NIS_RES_OBJECT (res)->zo_domain, NIS_MAXNAMELEN);
  82       res2 = nis_modify (buf, NIS_RES_OBJECT (res));
  83       status = NIS_RES_STATUS (res2);
  84       nis_freeresult (res);
  85       nis_freeresult (res2);
  86
  87       return status;
  88     }
  89   else
  90     return NIS_FAIL;
  91 }
  92 libnsl_hidden_nolink_def (nis_removemember, GLIBC_2_1)