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#!/bin/sh
###############################################################################
#
# Written by Igor Mammedov (niallain@gmail.com)
# Modified by Steve French <sfrench@samba.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version
# 2 of the License, or (at your option) any later version.
#
###############################################################################
#
# linux-cifs-client dns name resolver helper
# called by cifs kernel module upcall to key API to resolve server name
# to IP when module connects to DFS link. We may eventually make this
# C code, but this is a good starting point.
# You should have appropriate kernel and keyutils installed.
# CIFS DFS Support will require Linux kernel module
# cifs.ko version 1.48 or later.
#
# Consult the CIFS client users guide for more details
# http://www.samba.org/samba/ftp/cifs-cvs/linux-cifs-client-guide.pdf
#
# Put the following string in /etc/request-key.conf without comment sign :)
# create cifs_resolver * * /sbin/cifs_resolver.sh %k %d %S
#
# Put this script into /sbin directory
# Call: /sbin/cifs_resolver.sh <keyid> <desc> <session-keyring>
#
# <desc> - is server name to resolve
#
status=0
{
echo "cifs_resolver: resolving: $2"
DATAA=`/usr/bin/host $2`
status=$?
if [ "x$status" != "x0" ]; then
echo "cifs_resolver: failed to resolve: $2"
exit $status
else
DATAA=`echo "$DATAA" | sed 's/.*has address //'`
echo "cifs_resolver: resolved: $2 to $DATAA"
keyctl instantiate $1 "$DATAA" $3 || exit 1
fi
# if you want to debug the upcall, replace /dev/null (below) with ttyS0 or file
} >&/dev/null
exit 0
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