inet/netgroup.h

   1 /* Internal header for netgroup related functions.
   2    Copyright (C) 1996-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 #ifndef _NETGROUP_H
  20 #define _NETGROUP_H     1
  21
  22 #include <nsswitch.h>
  23
  24 /* A netgroup can consist of names of other netgroups.  We have to
  25    track which netgroups were read and which still have to be read.  */
  26 struct name_list
  27 {
  28   struct name_list *next;
  29   char name[];
  30 };
  31
  32
  33 /* Dataset for iterating netgroups.  */
  34 struct __netgrent
  35 {
  36   enum { triple_val, group_val } type;
  37
  38   union
  39   {
  40     struct
  41     {
  42       const char *host;
  43       const char *user;
  44       const char *domain;
  45     }
  46     triple;
  47
  48     const char *group;
  49   } val;
  50
  51   /* Room for the data kept between the calls to the netgroup
  52      functions.  We must avoid global variables.  */
  53   char *data;
  54   size_t data_size;
  55   union
  56   {
  57     char *cursor;
  58     unsigned long int position;
  59   };
  60   int first;
  61
  62   struct name_list *known_groups;
  63   struct name_list *needed_groups;
  64
  65   /* This handle for the NSS data base is shared between all
  66      set/get/endXXXent functions.  */
  67   service_user *nip;
  68 };
  69
  70
  71 /* The internal netgroup handling functions might be called from outside.  */
  72 extern int __internal_setnetgrent (const char *group,
  73                                    struct __netgrent *datap);
  74 libc_hidden_proto (__internal_setnetgrent)
  75 extern void __internal_endnetgrent (struct __netgrent *datap);
  76 libc_hidden_proto (__internal_endnetgrent)
  77 extern int __internal_getnetgrent_r (char **hostp, char **userp,
  78                                      char **domainp, struct __netgrent *datap,
  79                                      char *buffer, size_t buflen, int *errnop);
  80 libc_hidden_proto (__internal_getnetgrent_r)
  81
  82 #endif /* netgroup.h */