#!/bin/bash

#
# Generate OpenVPN configs
#

set -ex

server_url=$1
[ -z "$server_url" ] && server_url=$(cat "$OPENVPN/server_url" 2> /dev/null)

if [[ "$server_url" =~ ^((udp|tcp)://)?([0-9a-zA-Z\.]+)(:([0-9]+))?$ ]]; then
    proto=${BASH_REMATCH[2]};
    port=${BASH_REMATCH[5]};
else
    echo "Common name not specified"
    exit 1
fi

# Apply defaults
[ -z "$proto" ] && proto=1194
[ -z "$port" ] && port=udp

conf=$OPENVPN/udp1194.conf
if [ -f "$conf" ]; then
    bak=$conf.$(date +%s).bak
    echo "Backing up $conf -> $bak"
    mv "$conf" "$bak"
fi

cat > "$conf" <<EOF
server 192.168.255.0 255.255.255.0
verb 3
#duplicate-cn
key $EASYRSA_PKI/private/$cn.key
ca $EASYRSA_PKI/ca.crt
cert $EASYRSA_PKI/issued/$cn.crt
dh $EASYRSA_PKI/dh.pem
tls-auth $EASYRSA_PKI/ta.key
key-direction 0
keepalive 10 60
persist-key
persist-tun
push "dhcp-option DNS 8.8.4.4"
push "dhcp-option DNS 8.8.8.8"

client-config-dir $OPENVPN/ccd
route 192.168.254.0 255.255.255.0

proto $proto
port $port
dev tun1194
status /tmp/openvpn-status-1194.log
EOF