redsocks.sh

#!/bin/bash
set -x
# install and config redsocks
sudo apt install -y redsocks

sudo -E tee /etc/redsocks.conf >/dev/null << EOF
base {
        log_debug = on;
        log_info = on;
        log = "file:/var/log/redsocks.log";
        daemon = on;
        user = redsocks;
        group = redsocks;
        redirector = iptables;
}
redsocks {
        local_ip = 127.0.0.1;
        local_port = 6666;
        // ip = 10.239.4.80 child-prc;
        ip = $INTEL_PROXY;
        port = 1080;
        type = socks5;
}
redudp {
        local_ip = 127.0.0.1;
        local_port = 8888;
        ip = $INTEL_PROXY;
        port = 1080;
        udp_timeout = 30;
        udp_timeout_stream = 180;
}
dnstc {
        local_ip = 127.0.0.1;
        local_port = 5300;
}
EOF

sudo tee /bin/proxy.sh >/dev/null << EOF
iptables -t nat -N REDSOCKS || true
iptables -t nat -F REDSOCKS
iptables -t nat -A REDSOCKS -d 0.0.0.0/8 -j RETURN
iptables -t nat -A REDSOCKS -d 10.0.0.0/8 -j RETURN
iptables -t nat -A REDSOCKS -d 127.0.0.0/8 -j RETURN
iptables -t nat -A REDSOCKS -d 169.254.0.0/16 -j RETURN
iptables -t nat -A REDSOCKS -d 172.16.0.0/12 -j RETURN
iptables -t nat -A REDSOCKS -d 192.168.0.0/16 -j RETURN
iptables -t nat -A REDSOCKS -d 224.0.0.0/4 -j RETURN
iptables -t nat -A REDSOCKS -d 240.0.0.0/4 -j RETURN
iptables -t nat -A REDSOCKS -p tcp -j DNAT --to-destination 127.0.0.1:6666
iptables -t nat -A REDSOCKS -p udp -j DNAT --to-destination 127.0.0.1:8888
iptables -t nat -A OUTPUT -p tcp -j REDSOCKS
iptables -t nat -A PREROUTING -p tcp -j REDSOCKS
EOF

sudo chmod +x /bin/proxy.sh

sudo proxy.sh
sudo service redsocks restart

# settings for docker
sudo sysctl -w net.ipv4.conf.default.route_localnet=1
sudo sysctl -w net.ipv4.conf.all.route_localnet=1

grep "route_localnet" /etc/sysctl.conf
if [ $? -ne 0 ]; then
    sudo tee -a /etc/sysctl.conf >/dev/null << EOF
net.ipv4.conf.all.route_localnet = 1
net.ipv4.conf.default.route_localnet = 1
EOF
fi