nis/nis_local_names.c

   1 /* Copyright (c) 1997, 1998 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <rpcsvc/nis.h>
  24
  25 nis_name
  26 nis_local_group (void)
  27 {
  28   static char __nisgroup[NIS_MAXNAMELEN + 1];
  29
  30   if (__nisgroup[0] == '\0')
  31     {
  32       char *cptr;
  33       char *cp;
  34
  35       if ((cptr = getenv ("NIS_GROUP")) == NULL)
  36         return __nisgroup;
  37
  38       if (strlen (cptr) >= NIS_MAXNAMELEN)
  39         return __nisgroup;
  40
  41       cp = stpcpy (__nisgroup, cptr);
  42
  43       if (cp[-1] != '.')
  44         {
  45           cptr = nis_local_directory ();
  46           if ((cp - __nisgroup) + strlen (cptr) + 1 < NIS_MAXNAMELEN)
  47             {
  48               *cp++ = '.';
  49               strcpy (cp, cptr);
  50             }
  51           else
  52             __nisgroup[0] = '\0';
  53         }
  54     }
  55
  56   return __nisgroup;
  57 }
  58
  59
  60 nis_name
  61 nis_local_directory (void)
  62 {
  63   static char __nisdomainname[NIS_MAXNAMELEN + 1];
  64
  65   if (__nisdomainname[0] == '\0')
  66     {
  67       if (getdomainname (__nisdomainname, NIS_MAXNAMELEN) < 0)
  68         __nisdomainname[0] = '\0';
  69       else
  70         {
  71           char *cp = strchr (__nisdomainname, '\0');
  72
  73           /* Missing trailing dot? */
  74           if (cp[-1] != '.')
  75             {
  76               *cp++ = '.';
  77               *cp = '\0';
  78             }
  79         }
  80     }
  81
  82   return __nisdomainname;
  83 }
  84
  85 nis_name
  86 nis_local_principal (void)
  87 {
  88   static char __principal[NIS_MAXNAMELEN + 1];
  89
  90   if (__principal[0] == '\0')
  91     {
  92       char buf[NIS_MAXNAMELEN + 1];
  93       nis_result *res;
  94       uid_t uid = geteuid ();
  95
  96       if (uid != 0)
  97         {
  98           int len = snprintf (buf, NIS_MAXNAMELEN - 1,
  99                               "[auth_name=%d,auth_type=LOCAL],cred.org_dir.%s",
 100                               uid, nis_local_directory ());
 101
 102           if (len >= NIS_MAXNAMELEN - 1)
 103             /* XXX The buffer is too small.  Can this happen???  */
 104             return strcpy (__principal, "nobody");
 105
 106           if (buf[len - 1] != '.')
 107             {
 108               buf[len++] = '.';
 109               buf[len] = '\0';
 110             }
 111
 112           res = nis_list (buf, USE_DGRAM + NO_AUTHINFO + FOLLOW_LINKS +
 113                           FOLLOW_PATH, NULL, NULL);
 114
 115           if (res == NULL)
 116             return strcpy (__principal, "nobody");
 117
 118           if (NIS_RES_STATUS (res) == NIS_SUCCESS)
 119             {
 120               if (res->objects.objects_len > 1)
 121                 {
 122                   /* More than one principal with same uid?  something
 123                      wrong with cred table.  Should be unique.  Warn user
 124                      and continue.  */
 125                   printf (_("\
 126 LOCAL entry for UID %d in directory %s not unique\n"),
 127                           uid, nis_local_directory ());
 128                 }
 129               strcpy (__principal, ENTRY_VAL (res->objects.objects_val, 0));
 130               nis_freeresult (res);
 131               return __principal;
 132             }
 133           else
 134             {
 135               nis_freeresult (res);
 136               return strcpy (__principal, "nobody");
 137             }
 138         }
 139       else
 140         return strcpy (__principal, nis_local_host ());
 141
 142       /* Should be never reached */
 143       return strcpy (__principal, "nobody");
 144     }
 145   return __principal;
 146 }
 147
 148 nis_name
 149 nis_local_host (void)
 150 {
 151   static char __nishostname[NIS_MAXNAMELEN + 1];
 152
 153   if (__nishostname[0] == '\0')
 154     {
 155       if (gethostname (__nishostname, NIS_MAXNAMELEN) < 0)
 156         __nishostname[0] = '\0';
 157       else
 158         {
 159           char *cp = strchr (__nishostname, '\0');
 160           int len = cp - __nishostname;
 161
 162           /* Hostname already fully qualified? */
 163           if (cp[-1] == '.')
 164             return __nishostname;
 165
 166           if (len + strlen (nis_local_directory ()) + 1 > NIS_MAXNAMELEN)
 167             {
 168               __nishostname[0] = '\0';
 169               return __nishostname;
 170             }
 171
 172           *cp++ = '.';
 173           strncpy (cp, nis_local_directory (), NIS_MAXNAMELEN - len -1);
 174           __nishostname[NIS_MAXNAMELEN] = '\0';
 175         }
 176     }
 177
 178   return __nishostname;
 179 }