manually set openvpn route by script for Tunnelblick on macOS

a.sh

#!/usr/bin/env php

# you should add the following two line in you ovpn.conf
# route-noexec # donot let openvpn set local route
# route-up a.sh # run a.sh under ~/Library/Application Support/Tunnelblick/Configurations/bilibili.tblk/Contents/Resources

<?php
$env = $_ENV;

$route = [];

foreach ($env as $key => $value) {
    if (preg_match('/route_(netmask|network|gateway)_(\d+)/', $key, $matches)) {
        $id = $matches[2];
        $key = $matches[1];
        $route[$id][$key] = $value;
    }
}
foreach ($route as $id => $info) {
    $cmd = "/sbin/route add ${info['network']} ${info['gateway']} -netmask ${info['netmask']}";
    system($cmd);
}