nis/nis_removemember.c

   1 /* Copyright (c) 1997, 1998, 1999, 2004, 2005 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 <assert.h>
  21 #include <string.h>
  22 #include <rpcsvc/nis.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 leafbuf[grouplen + 2];
  32       char domainbuf[grouplen + 2];
  33       nis_name *newmem;
  34       nis_result *res, *res2;
  35       nis_error status;
  36       char *cp, *cp2;
  37       unsigned long int i, j, k;
  38
  39       cp = stpcpy (buf, nis_leaf_of_r (group, leafbuf, sizeof (leafbuf) - 1));
  40       cp = stpcpy (cp, ".groups_dir");
  41       cp2 = nis_domain_of_r (group, domainbuf, sizeof (domainbuf) - 1);
  42       if (cp2 != NULL && cp2[0] != '\0')
  43         {
  44           cp = stpcpy (cp, ".");
  45           stpcpy (cp, cp2);
  46         }
  47       res = nis_lookup (buf, FOLLOW_LINKS|EXPAND_NAME);
  48       if (res == NULL || NIS_RES_STATUS (res) != NIS_SUCCESS)
  49         {
  50           if (res)
  51             {
  52               status = NIS_RES_STATUS (res);
  53               nis_freeresult (res);
  54             }
  55           else
  56             return NIS_NOMEMORY;
  57           return status;
  58         }
  59
  60       if ((res->objects.objects_len != 1) ||
  61           (__type_of (NIS_RES_OBJECT (res)) != NIS_GROUP_OBJ))
  62         {
  63           nis_freeresult (res);
  64           return NIS_INVALIDOBJ;
  65         }
  66
  67       newmem =
  68         calloc (NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len,
  69                 sizeof (char *));
  70       if (newmem == NULL)
  71         return NIS_NOMEMORY;
  72
  73       k = NIS_RES_OBJECT (res)[0].GR_data.gr_members.gr_members_len;
  74       j = 0;
  75       for (i = 0; i < NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len;
  76            ++i)
  77         {
  78           if (strcmp (NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_val[i],
  79                       member) != 0)
  80             {
  81               newmem[j] = NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_val[i];
  82               ++j;
  83             }
  84           else
  85             {
  86               free (NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_val[i]);
  87               --k;
  88             }
  89         }
  90       free (NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val);
  91       assert (k <= NIS_RES_OBJECT(res)->GR_data.gr_members.gr_members_len);
  92       /* This realloc() call always decreases the size.  This cannot
  93          fail.  We still have the test but do not recover memory
  94          (i.e., we overwrite the input pointer).  */
  95       nis_name *newp = realloc (newmem, k * sizeof (char*));
  96       if (newp == NULL)
  97         {
  98           free (newmem);
  99           return NIS_NOMEMORY;
 100         }
 101       newmem = newp;
 102
 103       NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_val = newmem;
 104       NIS_RES_OBJECT (res)->GR_data.gr_members.gr_members_len = k;
 105
 106       cp = stpcpy (buf, NIS_RES_OBJECT (res)->zo_name);
 107       *cp++ = '.';
 108       strncpy (cp, NIS_RES_OBJECT (res)->zo_domain, NIS_MAXNAMELEN);
 109       res2 = nis_modify (buf, NIS_RES_OBJECT (res));
 110       status = NIS_RES_STATUS (res2);
 111       nis_freeresult (res);
 112       nis_freeresult (res2);
 113
 114       return status;
 115     }
 116   else
 117     return NIS_FAIL;
 118 }