nick-fedesna / goatproxy

A small HTTP proxy written in Go

GoatProxy

A small HTTP proxy written in Go with option to launch an Android Activity passing necessary proxy info as extras.

Command Usage

    $ ./goatproxy -host=my.app.com -port:8888 -ssl=true -latency=0 -pkg=com.example.app

Android

Requires permission android.permission.ACCESS_WIFI_STATE.

Drop the code below into your project, call GoatProxy.getGoatProxy(this) in onCreate() of your main launch activity which returns the Proxy or Proxy.NO_PROXY.

SSL: override your https:// network requests to use http:// when using the Proxy.

import static android.content.Context.WIFI_SERVICE;
import static android.util.Patterns.IP_ADDRESS;

import android.app.Activity;
import android.net.DhcpInfo;
import android.net.wifi.WifiManager;

import java.net.*;

public class GoatProxy {

    public static Proxy getGoatProxy(Activity aActivity) {
        if (aActivity.getIntent().hasExtra("goatProxyHosts")) {
            String[] ips = aActivity.getIntent().getStringExtra("goatProxyHosts").split("�");
            if (ips != null && ips.length > 0) {
                WifiManager wifi = (WifiManager) aActivity.getSystemService(WIFI_SERVICE);
                int myAddr = wifi.getConnectionInfo().getIpAddress();
                InetAddress ip = matchProxyAddress(myAddr, ips, wifi.getDhcpInfo());
                if (ip != null) {
                    String port = aActivity.getIntent().getStringExtra("goatProxyPort");
                    port = (port == null) ? "8080" : port;
                    return new Proxy(Proxy.Type.HTTP, new InetSocketAddress(ip, Integer.parseInt(port)));
                }
            }
        }
        return Proxy.NO_PROXY;
    }

    private static InetAddress matchProxyAddress(int aIpAddr, String[] aIpArray, DhcpInfo aDhcp) {
        for (String ip : aIpArray) {
            if (IP_ADDRESS.matcher(ip).matches()) {
                try {
                    InetAddress[] inets = InetAddress.getAllByName(ip);
                    if (inets != null && inets.length > 0) {
                        int sub = inetAddressToInt(inets[0]) & 0xffffff;
                        if (sub == (aIpAddr & 0xffffff)) {
                            return inets[0];
                        }
                        if (aDhcp != null && sub == (aDhcp.dns1 & 0xffffff)) {
                            return inets[0];
                        }
                    }
                } catch (UnknownHostException ignored) { }
            }
        }

        return null;
    }

    private static int inetAddressToInt(InetAddress inetAddr) throws IllegalArgumentException {
        byte[] addr = inetAddr.getAddress();
        return ((addr[3] & 0xff) << 24) | ((addr[2] & 0xff) << 16) |
                ((addr[1] & 0xff) << 8) | (addr[0] & 0xff);
    }

}

###To-Do:

• Android: remember Proxy info and detect if it is still active (when extras not present)
• Android: hook into Activity lifecycle callbacks to get launch intent extras, removing need to pass Activity to getGoatProxy()
• Go: present device chooser when multiple adb devices found