fw4_proxy

#!/bin/ash

uci show firewall | grep 'Proxy-HTTP-' | while read -r line; do
    uci_path="$(echo "$line" | sed -n 's/\(firewall.*\)\.name=.*/\1/p')";
    domain="$(echo "$line" | sed -n "s/.*='Proxy-HTTP-\(.*\)'/\1/p")";
    ipaddr="$(nslookup -type=a $domain 1.1.1.1 | sed -n 's/address: \(.*\)/\1/pi' | head -n1)";
    dest_ip="$(uci get "${uci_path}.dest_ip")";
    if [ -z "$uci_path" ] || [ -z "$domain" ] || [ -z "$ipaddr" ] || [ -z "$dest_ip" ]; then
        >&2 echo "something went wrong. abort.";
        >&2 echo "uci_path='$uci_path'";
        >&2 echo "domain='$domain'";
        >&2 echo "ipaddr='$ipaddr'";
        >&2 echo "dest_ip='$dest_ip'";
        uci revert firewall;
        exit 1;
    fi

    if [ "$dest_ip" != "$ipaddr" ]; then
        uci set "${uci_path}.dest_ip=$ipaddr"
    fi
done

uci commit firewall && service firewall reload