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|
#!/bin/bash
SN="`basename $0`" # base portion of our filename
AE="-a" # switch to add an entry
RE="-r" # swithc to remove an entry
EL="/tmp/resolv.conf" # expected location of the system nameserver config file
ARGS="$@" # friendly variable name for all args
usage(){
echo "usage:
$SN -a {ip} [{ip}...]
$SN -r {ip} [{ip}...]"
}
#if are there at least two arguments?
if [ "$#" -gt 1 ]
then
#remove any old resolv.conf file
rm .resolve.conf .resolve.old .resolve.new 2> /dev/null
#cast current nameserver file into OLD
cat "$EL" > .resolve.old
#build IP list
for ARG in $ARGS
do
if [ "$ARG" != "$1" ]
then
IP_LIST=`echo "$IP_LIST $ARG"`
fi
done
#select case on first switch
case "$1" in
#case '-a'
"$AE" )
#for each IP in IP_LIST
for IP in $IP_LIST
do
#add nameserver entery to .newfile
echo "nameserver $IP" >> .resolve.conf
#cat OLD into grep excluding IP lines,
#storing results into NEW
cat .resolve.old | grep -v "$IP" > .resolve.new
#set OLD to NEW
cat .resolve.new > .resolve.old
done
#cat OLD onto end of .newfile
cat .resolve.new >> .resolve.conf
#clean up work files
rm .resolve.new .resolve.old
#move old conf file to old conf file.bak
mv "$EL" "$EL.bak"
#move .newfile to resolve.conf file
mv .resolve.conf "$EL"
echo "Added $IP_LIST to $EL"
;;
#case '-r'
"$RE" )
#for each IP in IP_LIST
for IP in $IP_LIST
do
#cat OLD into grep excluding IP lines,
#storing results into NEW
cat .resolve.old | grep -v "$IP" > .resolve.new
#set OLD to NEW
cat .resolve.new > .resolve.old
done
#move old conf file to old conf file.bak
mv "$EL" "$EL.bak"
#move .newfile to resolve.conf file
mv .resolve.new "$EL"
echo "Removed $IP_LIST from $EL"
;;
#case else
* )
usage
;;
#end switch
esac
#else
else
usage
#end
fi
|
