transmission-control.php

<?php

class VPNNetMonitoring extends Primer\Console\Command\BaseCommand
{
    private $vpnInterface = 'ppp0';

    public function configure()
    {
        $this->setName('netmon:transmission');
        $this->setDescription("Monitoring the necessary network interface to bind all Transmission traffic through");
    }

    public function run()
    {
        if ($this->isVpnConnected()) {
            return;
        }

        // Quit Transmission
        `osascript -e 'quit app "Transmission"'`;
        $count = 0;
        do {
            if ($count === 5) {
                $this->out("Unable to start FrootVPN. Exiting.");
                return;
            }

            // Start the VPN
            `/usr/sbin/scutil --nc start FrootVPN`;
            sleep(10);
            $count++;
        } while (!$this->isVpnConnected());

        $interface = json_decode($this->getIpByInterface($this->vpnInterface), true);
        $ip = trim($interface['ip_address']);

        $this->out("VPN is connected with IP '{$ip}'");
        $this->out("Writing Transmission defaults variable");

        `defaults write org.m0k.transmission BindAddressIPv4 "$ip"`;
        sleep(2);
        $value = trim(`defaults read org.m0k.transmission BindAddressIPv4`);

        if ($value !== $ip) {
            $this->out("Defaults value doesn't not match IP. IP = $ip, value = $value");

            return;
        }

        $this->out("Opening Transmission");
        `open /Applications/Transmission.app`;
    }

    private function isVpnConnected()
    {
        $status = `/usr/sbin/scutil --nc status FrootVPN`;
        if (preg_match('#\AConnected#', $status)) {
            return true;
        }

        return false;
    }

    private function getIpByInterface($interface)
    {
        $cmd = <<<__CMD__
function get_address {
        ELEM=($(echo $1 | tr ":" "\\n"))
    echo \${ELEM[1]}
}

PLATFORM=$(uname)

IFACE="$1"
IFCFG=$(ifconfig "$interface")

if [ \$PLATFORM == "Linux" ]; then

    IFACE_DATA=($(echo "\$IFCFG" | grep "inet addr" | awk '{print $2"\n"$3"\n"$4}'))
    MACADDR=$(echo "\$IFCFG" | grep HWaddr | awk '{print $5}')
    ADDRESS=$(get_address \${IFACE_DATA[0]})
    BROADCAST=$(get_address \${IFACE_DATA[1]})
    NETMASK=$(get_address \${IFACE_DATA[2]})

else #On OS X (\$PLATFORM == "Darwin")

    IFACE_DATA=($(echo "\$IFCFG" | grep "inet " | awk '{print $2"\\n"$4"\\n"$6}'))
    MACADDR=$(echo "\$IFCFG" | grep ether | awk '{print $2}')
    ADDRESS=\${IFACE_DATA[0]}
    BROADCAST=\${IFACE_DATA[2]}
    NETMASK=\${IFACE_DATA[1]}

fi

echo "{"
echo "  \"dev\": \"\$IFACE\","
echo "  \"mac_address\": \"\${MACADDR}\","
echo "  \"ip_address\": \"\${ADDRESS}\","
echo "  \"broadcast\": \"\${BROADCAST}\","
echo "  \"netmask\": \"\${NETMASK}\""
echo "}"
__CMD__;

        return `$cmd`;
    }
}