nis/nis_addmember.c

   1 /* Copyright (c) 1997-2021 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_addmember (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++ = '.';
  42           stpcpy (cp, cp2);
  43         }
  44       res = nis_lookup (buf, FOLLOW_LINKS | EXPAND_NAME);
  45       if (NIS_RES_STATUS (res) != NIS_SUCCESS)
  46         {
  47           status = NIS_RES_STATUS (res);
  48           nis_freeresult (res);
  49           return status;
  50         }
  51       if (NIS_RES_NUMOBJ (res) != 1
  52           || __type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ)
  53         {
  54           nis_freeresult (res);
  55           return NIS_INVALIDOBJ;
  56         }
  57
  58       u_int gr_members_len
  59         = NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len;
  60
  61       nis_name *new_gr_members_val
  62         = realloc (NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val,
  63                    (gr_members_len + 1) * sizeof (nis_name));
  64       if (new_gr_members_val == NULL)
  65         goto nomem_out;
  66
  67       NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val
  68         = new_gr_members_val;
  69
  70       new_gr_members_val[gr_members_len] = strdup (member);
  71       if (new_gr_members_val[gr_members_len] == NULL)
  72         {
  73         nomem_out:
  74           nis_freeresult (res);
  75           return NIS_NOMEMORY;
  76         }
  77       ++NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len;
  78
  79       /* Check the buffer bounds are not exceeded.  */
  80       assert (strlen (NIS_RES_OBJECT(res)->zo_name) + 1 < grouplen + 14);
  81       cp = stpcpy (buf, NIS_RES_OBJECT(res)->zo_name);
  82       *cp++ = '.';
  83       strncpy (cp, NIS_RES_OBJECT (res)->zo_domain, NIS_MAXNAMELEN);
  84       res2 = nis_modify (buf, NIS_RES_OBJECT (res));
  85       status = NIS_RES_STATUS (res2);
  86       nis_freeresult (res);
  87       nis_freeresult (res2);
  88
  89       return status;
  90     }
  91   else
  92     return NIS_FAIL;
  93 }
  94 libnsl_hidden_nolink_def (nis_addmember, GLIBC_2_1)