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Prevent overlapping runs #1

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Prevent overlapping runs #1

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22 changes: 14 additions & 8 deletions add_iptables_block.sh
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Original file line number Diff line number Diff line change
@@ -1,12 +1,18 @@
#!/bin/bash
iptables_path=/usr/sbin/iptables
blocked_ips=`cat ~/gitlab-iptables-blocker/blocked_ips.txt`
iptables_list=`$iptables_path -L DOCKER-USER`
lockfile="/tmp/iptables_blocker.lock"

while read -r line; do
if ! echo "$iptables_list" | grep -q $line; then
echo "Adding $line to iptables deny rule"
sh -c "$iptables_path -I DOCKER-USER -s $line -j DROP -m comment --comment \"Malicious IP range\""
fi
done <<< $blocked_ips
# Prevent overlapping runs
exec 9>"$lockfile"
flock -n 9 || exit 1

# Load current blocked rules once
iptables_rules="$(iptables-save -t filter | grep DOCKER-USER)"

# Read list of IPs to block
while IFS= read -r ip; do
if ! echo "$iptables_rules" | grep -q "\-s $ip "; then
echo "Adding $ip to iptables deny rule"
$iptables_path -I DOCKER-USER -s "$ip" -j DROP -m comment --comment "Malicious IP range"
fi
done < ~/gitlab-iptables-blocker/blocked_ips.txt