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|
#!/sbin/sh
#
# --------------------------------------------------------------
# -- DNS cache save/load script
# --
# -- Version 1.0
# -- By Yuri Voinov (c) 2006, 2014
# --------------------------------------------------------------
#
# ident "@(#)unbound_cache.sh 1.1 14/04/26 YV"
#
#############
# Variables #
#############
# Installation base dir
CONF="/etc/opt/csw/unbound"
BASE="/opt/csw"
# Unbound binaries
UC="$BASE/sbin/unbound-control"
FNAME="unbound_cache.dmp"
# OS utilities
BASENAME=`which basename`
CAT=`which cat`
CUT=`which cut`
ECHO=`which echo`
GETOPT=`which getopt`
ID=`which id`
PRINTF=`which printf`
###############
# Subroutines #
###############
usage_note ()
{
# Script usage note
$ECHO "Usage: `$BASENAME $0` [-s] or [-l] or [-r] or [-h]"
$ECHO
$ECHO "l - Load - default mode. Warming up Unbound DNS cache from saved file. cache-ttl must be high value."
$ECHO "s - Save - save Unbound DNS cache contents to plain file with domain names."
$ECHO "r - Reload - reloadind new cache entries and refresh existing cache"
$ECHO "h - this screen."
$ECHO "Note: Run without any arguments will be in default mode."
$ECHO " Also, unbound-control must be configured."
exit 0
}
root_check ()
{
if [ ! `$ID | $CUT -f1 -d" "` = "uid=0(root)" ]; then
$ECHO "ERROR: You must be super-user to run this script."
exit 1
fi
}
check_uc ()
{
if [ ! -f "$UC" ]; then
$ECHO .
$ECHO "ERROR: $UC not found. Exiting..."
exit 1
fi
}
check_saved_file ()
{
if [ ! -f "$CONF/$FNAME" ]; then
$ECHO .
$ECHO "ERROR: File $CONF/$FNAME does not exists. Save it first."
exit 1
fi
}
save_cache ()
{
# Save unbound cache
$PRINTF "Saving cache in $CONF/$FNAME..."
$UC dump_cache>$CONF/$FNAME
$ECHO "ok"
}
load_cache ()
{
# Load saved cache contents and warmup DNS cache
$PRINTF "Loading cache from saved $CONF/$FNAME..."
check_saved_file
$CAT $CONF/$FNAME|$UC load_cache
}
reload_cache ()
{
# Reloading and refresh existing cache and saved dump
save_cache
load_cache
}
##############
# Main block #
##############
# Root check
root_check
# Check unbound-control
check_uc
# Check command-line arguments
if [ "x$1" = "x" ]; then
# If arguments list empty, load cache by default
load_cache
else
arg_list=$1
# Parse command line
set -- `$GETOPT sSlLrRhH: $arg_list` || {
usage_note 1>&2
}
# Read arguments
for i in $arg_list
do
case $i in
-s | -S) save_cache;;
-l | -L) load_cache;;
-r | -R) reload_cache;;
-h | -H | \?) usage_note;;
esac
break
done
fi
exit 0
|
