source/client/cifs_resolver.sh

   1 #!/bin/sh
   2 ###############################################################################
   3 #
   4 # Written by Igor Mammedov (niallain@gmail.com)
   5 # Modified by Steve French <sfrench@samba.org>
   6 #
   7 # This program is free software; you can redistribute it and/or
   8 # modify it under the terms of the GNU General Public License
   9 # as published by the Free Software Foundation; either version
  10 # 2 of the License, or (at your option) any later version.
  11 #
  12 ###############################################################################
  13 #
  14 # linux-cifs-client dns name resolver helper
  15 #     called by cifs kernel module upcall to key API to resolve server name
  16 #     to IP when module connects to DFS link.  We may eventually make this
  17 #     C code, but this is a good starting point.
  18 #     You should have appropriate kernel and keyutils installed.
  19 #     CIFS DFS Support will require Linux kernel module
  20 #       cifs.ko version 1.48 or later.
  21 #
  22 #     Consult the CIFS client users guide for more details
  23 #        http://www.samba.org/samba/ftp/cifs-cvs/linux-cifs-client-guide.pdf
  24 #
  25 # Put the following string in /etc/request-key.conf without comment sign :)
  26 #    create  cifs_resolver   *       *           /sbin/cifs_resolver.sh %k %d %S
  27 #
  28 # Put this script into /sbin directory
  29 # Call:  /sbin/cifs_resolver.sh <keyid> <desc> <session-keyring>
  30 #
  31 #     <desc> - is server name to resolve
  32 #
  33
  34 status=0
  35 {
  36     echo "cifs_resolver: resolving: $2"
  37
  38     DATAA=`/usr/bin/host $2`
  39     status=$?
  40
  41     if [ "x$status" != "x0" ]; then
  42             echo "cifs_resolver: failed to resolve: $2"
  43             exit $status
  44     else
  45             DATAA=`echo "$DATAA" | sed 's/.*has address //'`
  46             echo "cifs_resolver: resolved: $2 to $DATAA"
  47             keyctl instantiate $1 "$DATAA" $3 || exit 1
  48     fi
  49 # if you want to debug the upcall, replace /dev/null (below) with ttyS0 or file
  50 } >&/dev/null
  51 exit 0