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added if block to drop rule in INPUT chain if it is not at first position #34

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added if block to drop rule in INPUT chain if it is not at first position #34

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13 changes: 13 additions & 0 deletions update-blacklist.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,19 @@ if ! ipset list -n|command grep -q "$IPSET_BLACKLIST_NAME"; then
fi
fi

# drop rule if it isn't in a first position
if [ `iptables -L INPUT --line-num|command grep "match-set $IPSET_BLACKLIST_NAME" | cut -f1 -d" "` != "1" ]; then
if [[ ${FORCE:-no} != yes ]]; then
echo >&2 "Error: iptables need to drop ipset INPUT rule, drop it using:"
echo >&2 "# iptables -D INPUT -m set --match-set $IPSET_BLACKLIST_NAME src -j DROP"
exit 1
fi
if ! iptables -D INPUT -m set --match-set "$IPSET_BLACKLIST_NAME" src -j DROP; then
echo >&2 "Error: while dropping the --match-set ipset rule from iptables"
exit 1
fi
fi

# create the iptables binding if needed (or abort if does not exists and FORCE=no)
if ! iptables -vL INPUT|command grep -q "match-set $IPSET_BLACKLIST_NAME"; then
# we may also have assumed that INPUT rule n°1 is about packets statistics (traffic monitoring)
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