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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.net;
     18 
     19 import android.os.ServiceManager;
     20 import android.util.Log;
     21 
     22 import com.android.net.IProxyService;
     23 import com.google.android.collect.Lists;
     24 
     25 import java.io.IOException;
     26 import java.net.InetSocketAddress;
     27 import java.net.MalformedURLException;
     28 import java.net.Proxy;
     29 import java.net.Proxy.Type;
     30 import java.net.ProxySelector;
     31 import java.net.SocketAddress;
     32 import java.net.URI;
     33 import java.net.URISyntaxException;
     34 import java.util.List;
     35 
     36 /**
     37  * @hide
     38  */
     39 public class PacProxySelector extends ProxySelector {
     40     private static final String TAG = "PacProxySelector";
     41     public static final String PROXY_SERVICE = "com.android.net.IProxyService";
     42     private static final String SOCKS = "SOCKS ";
     43     private static final String PROXY = "PROXY ";
     44 
     45     private IProxyService mProxyService;
     46     private final List<Proxy> mDefaultList;
     47 
     48     public PacProxySelector() {
     49         mProxyService = IProxyService.Stub.asInterface(
     50                 ServiceManager.getService(PROXY_SERVICE));
     51         if (mProxyService == null) {
     52             // Added because of b10267814 where mako is restarting.
     53             Log.e(TAG, "PacManager: no proxy service");
     54         }
     55         mDefaultList = Lists.newArrayList(java.net.Proxy.NO_PROXY);
     56     }
     57 
     58     @Override
     59     public List<Proxy> select(URI uri) {
     60         if (mProxyService == null) {
     61             mProxyService = IProxyService.Stub.asInterface(
     62                     ServiceManager.getService(PROXY_SERVICE));
     63         }
     64         if (mProxyService == null) {
     65             Log.e(TAG, "select: no proxy service return NO_PROXY");
     66             return Lists.newArrayList(java.net.Proxy.NO_PROXY);
     67         }
     68         String response = null;
     69         String urlString;
     70         try {
     71             // Strip path and username/password from URI so it's not visible to PAC script. The
     72             // path often contains credentials the app does not want exposed to a potentially
     73             // malicious PAC script.
     74             if (!"http".equalsIgnoreCase(uri.getScheme())) {
     75                 uri = new URI(uri.getScheme(), null, uri.getHost(), uri.getPort(), "/", null, null);
     76             }
     77             urlString = uri.toURL().toString();
     78         } catch (URISyntaxException e) {
     79             urlString = uri.getHost();
     80         } catch (MalformedURLException e) {
     81             urlString = uri.getHost();
     82         }
     83         try {
     84             response = mProxyService.resolvePacFile(uri.getHost(), urlString);
     85         } catch (Exception e) {
     86             Log.e(TAG, "Error resolving PAC File", e);
     87         }
     88         if (response == null) {
     89             return mDefaultList;
     90         }
     91 
     92         return parseResponse(response);
     93     }
     94 
     95     private static List<Proxy> parseResponse(String response) {
     96         String[] split = response.split(";");
     97         List<Proxy> ret = Lists.newArrayList();
     98         for (String s : split) {
     99             String trimmed = s.trim();
    100             if (trimmed.equals("DIRECT")) {
    101                 ret.add(java.net.Proxy.NO_PROXY);
    102             } else if (trimmed.startsWith(PROXY)) {
    103                 Proxy proxy = proxyFromHostPort(Type.HTTP, trimmed.substring(PROXY.length()));
    104                 if (proxy != null) {
    105                     ret.add(proxy);
    106                 }
    107             } else if (trimmed.startsWith(SOCKS)) {
    108                 Proxy proxy = proxyFromHostPort(Type.SOCKS, trimmed.substring(SOCKS.length()));
    109                 if (proxy != null) {
    110                     ret.add(proxy);
    111                 }
    112             }
    113         }
    114         if (ret.size() == 0) {
    115             ret.add(java.net.Proxy.NO_PROXY);
    116         }
    117         return ret;
    118     }
    119 
    120     private static Proxy proxyFromHostPort(Proxy.Type type, String hostPortString) {
    121         try {
    122             String[] hostPort = hostPortString.split(":");
    123             String host = hostPort[0];
    124             int port = Integer.parseInt(hostPort[1]);
    125             return new Proxy(type, InetSocketAddress.createUnresolved(host, port));
    126         } catch (NumberFormatException|ArrayIndexOutOfBoundsException e) {
    127             Log.d(TAG, "Unable to parse proxy " + hostPortString + " " + e);
    128             return null;
    129         }
    130     }
    131 
    132     @Override
    133     public void connectFailed(URI uri, SocketAddress address, IOException failure) {
    134 
    135     }
    136 
    137 }
    138