nis/nss-nis.c

   1 /* Copyright (C) 1996, 2001, 2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <ctype.h>
  20 #include <stdio.h>
  21 #include <stdio_ext.h>
  22 #include <string.h>
  23 #include <rpcsvc/ypclnt.h>
  24
  25 #include "nss-nis.h"
  26 #include "nsswitch.h"
  27
  28
  29 /* Convert YP error number to NSS error number.  */
  30 const enum nss_status __yperr2nss_tab[] =
  31 {
  32   [YPERR_SUCCESS] = NSS_STATUS_SUCCESS,
  33   [YPERR_BADARGS] = NSS_STATUS_UNAVAIL,
  34   [YPERR_RPC]     = NSS_STATUS_UNAVAIL,
  35   [YPERR_DOMAIN]  = NSS_STATUS_UNAVAIL,
  36   [YPERR_MAP]     = NSS_STATUS_UNAVAIL,
  37   [YPERR_KEY]     = NSS_STATUS_NOTFOUND,
  38   [YPERR_YPERR]   = NSS_STATUS_UNAVAIL,
  39   [YPERR_RESRC]   = NSS_STATUS_TRYAGAIN,
  40   [YPERR_NOMORE]  = NSS_STATUS_NOTFOUND,
  41   [YPERR_PMAP]    = NSS_STATUS_UNAVAIL,
  42   [YPERR_YPBIND]  = NSS_STATUS_UNAVAIL,
  43   [YPERR_YPSERV]  = NSS_STATUS_UNAVAIL,
  44   [YPERR_NODOM]   = NSS_STATUS_UNAVAIL,
  45   [YPERR_BADDB]   = NSS_STATUS_UNAVAIL,
  46   [YPERR_VERS]    = NSS_STATUS_UNAVAIL,
  47   [YPERR_ACCESS]  = NSS_STATUS_UNAVAIL,
  48   [YPERR_BUSY]    = NSS_STATUS_TRYAGAIN
  49 };
  50 const unsigned int __yperr2nss_count = (sizeof (__yperr2nss_tab)
  51                                         / sizeof (__yperr2nss_tab[0]));
  52
  53 int _nis_default_nss_flags;
  54
  55 static const char default_nss[] = "/etc/default/nss";
  56
  57 int
  58 _nis_check_default_nss (void)
  59 {
  60   FILE *fp = fopen (default_nss, "rc");
  61   int flags = NSS_FLAG_SET;
  62   if (fp != NULL)
  63     {
  64       char *line = NULL;
  65       size_t linelen = 0;
  66
  67       __fsetlocking (fp, FSETLOCKING_BYCALLER);
  68
  69       while (!feof_unlocked (fp))
  70         {
  71           ssize_t n = getline (&line, &linelen, fp);
  72           if (n <= 0)
  73             break;
  74
  75           /* There currently are only two variables we expect, so
  76              simplify the parsing.  Recognize only
  77
  78                NETID_AUTHORITATIVE = TRUE
  79                SERVICES_AUTHORITATIVE = TRUE
  80
  81              with arbitrary white spaces.  */
  82           char *cp = line;
  83           while (isspace (*cp))
  84             ++cp;
  85
  86           /* Recognize comment lines.  */
  87           if (*cp == '#')
  88             continue;
  89
  90           static const char netid_authoritative[] = "NETID_AUTHORITATIVE";
  91           static const char services_authoritative[]
  92             = "SERVICES_AUTHORITATIVE";
  93           size_t flag_len;
  94           if (strncmp (cp, netid_authoritative,
  95                        flag_len = sizeof (netid_authoritative) - 1) != 0
  96               && strncmp (cp, services_authoritative,
  97                           flag_len = sizeof (services_authoritative) - 1)
  98                  != 0)
  99             continue;
 100
 101           cp += flag_len;
 102           while (isspace (*cp))
 103             ++cp;
 104           if (*cp++ != '=')
 105             continue;
 106           while (isspace (*cp))
 107             ++cp;
 108
 109           if (strncmp (cp, "TRUE", 4) != 0)
 110             continue;
 111           cp += 4;
 112
 113           while (isspace (*cp))
 114             ++cp;
 115
 116           if (*cp == '\0')
 117             flags |= flag_len == sizeof (netid_authoritative) - 1
 118                      ? NSS_FLAG_NETID_AUTHORITATIVE
 119                      : NSS_FLAG_SERVICES_AUTHORITATIVE;
 120         }
 121
 122       free (line);
 123
 124       fclose (fp);
 125     }
 126
 127   _nis_default_nss_flags = flags;
 128   return flags;
 129 }