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 <stdlib.h>
  23 #include <string.h>
  24 #include <rpcsvc/ypclnt.h>
  25
  26 #include "nss-nis.h"
  27 #include "nsswitch.h"
  28
  29
  30 /* Convert YP error number to NSS error number.  */
  31 const enum nss_status __yperr2nss_tab[] =
  32 {
  33   [YPERR_SUCCESS] = NSS_STATUS_SUCCESS,
  34   [YPERR_BADARGS] = NSS_STATUS_UNAVAIL,
  35   [YPERR_RPC]     = NSS_STATUS_UNAVAIL,
  36   [YPERR_DOMAIN]  = NSS_STATUS_UNAVAIL,
  37   [YPERR_MAP]     = NSS_STATUS_UNAVAIL,
  38   [YPERR_KEY]     = NSS_STATUS_NOTFOUND,
  39   [YPERR_YPERR]   = NSS_STATUS_UNAVAIL,
  40   [YPERR_RESRC]   = NSS_STATUS_TRYAGAIN,
  41   [YPERR_NOMORE]  = NSS_STATUS_NOTFOUND,
  42   [YPERR_PMAP]    = NSS_STATUS_UNAVAIL,
  43   [YPERR_YPBIND]  = NSS_STATUS_UNAVAIL,
  44   [YPERR_YPSERV]  = NSS_STATUS_UNAVAIL,
  45   [YPERR_NODOM]   = NSS_STATUS_UNAVAIL,
  46   [YPERR_BADDB]   = NSS_STATUS_UNAVAIL,
  47   [YPERR_VERS]    = NSS_STATUS_UNAVAIL,
  48   [YPERR_ACCESS]  = NSS_STATUS_UNAVAIL,
  49   [YPERR_BUSY]    = NSS_STATUS_TRYAGAIN
  50 };
  51 const unsigned int __yperr2nss_count = (sizeof (__yperr2nss_tab)
  52                                         / sizeof (__yperr2nss_tab[0]));
  53
  54 int _nis_default_nss_flags;
  55
  56 static const char default_nss[] = "/etc/default/nss";
  57
  58 int
  59 _nis_check_default_nss (void)
  60 {
  61   FILE *fp = fopen (default_nss, "rc");
  62   int flags = NSS_FLAG_SET;
  63   if (fp != NULL)
  64     {
  65       char *line = NULL;
  66       size_t linelen = 0;
  67
  68       __fsetlocking (fp, FSETLOCKING_BYCALLER);
  69
  70       while (!feof_unlocked (fp))
  71         {
  72           ssize_t n = getline (&line, &linelen, fp);
  73           if (n <= 0)
  74             break;
  75
  76           /* There currently are only two variables we expect, so
  77              simplify the parsing.  Recognize only
  78
  79                NETID_AUTHORITATIVE = TRUE
  80                SERVICES_AUTHORITATIVE = TRUE
  81
  82              with arbitrary white spaces.  */
  83           char *cp = line;
  84           while (isspace (*cp))
  85             ++cp;
  86
  87           /* Recognize comment lines.  */
  88           if (*cp == '#')
  89             continue;
  90
  91           static const char netid_authoritative[] = "NETID_AUTHORITATIVE";
  92           static const char services_authoritative[]
  93             = "SERVICES_AUTHORITATIVE";
  94           size_t flag_len;
  95           if (strncmp (cp, netid_authoritative,
  96                        flag_len = sizeof (netid_authoritative) - 1) != 0
  97               && strncmp (cp, services_authoritative,
  98                           flag_len = sizeof (services_authoritative) - 1)
  99                  != 0)
 100             continue;
 101
 102           cp += flag_len;
 103           while (isspace (*cp))
 104             ++cp;
 105           if (*cp++ != '=')
 106             continue;
 107           while (isspace (*cp))
 108             ++cp;
 109
 110           if (strncmp (cp, "TRUE", 4) != 0)
 111             continue;
 112           cp += 4;
 113
 114           while (isspace (*cp))
 115             ++cp;
 116
 117           if (*cp == '\0')
 118             flags |= flag_len == sizeof (netid_authoritative) - 1
 119                      ? NSS_FLAG_NETID_AUTHORITATIVE
 120                      : NSS_FLAG_SERVICES_AUTHORITATIVE;
 121         }
 122
 123       free (line);
 124
 125       fclose (fp);
 126     }
 127
 128   _nis_default_nss_flags = flags;
 129   return flags;
 130 }