Ben Gruver | 4efe940 | 2013-04-02 21:18:41 -0700 | [diff] [blame] | 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 com.android.server.firewall; |
| 18 | |
Ben Gruver | f5323fe | 2013-07-31 15:09:51 -0700 | [diff] [blame] | 19 | import android.content.ComponentName; |
Ben Gruver | 4efe940 | 2013-04-02 21:18:41 -0700 | [diff] [blame] | 20 | import android.content.Intent; |
| 21 | import android.content.pm.ApplicationInfo; |
| 22 | import android.net.Uri; |
| 23 | import org.xmlpull.v1.XmlPullParser; |
| 24 | import org.xmlpull.v1.XmlPullParserException; |
| 25 | |
| 26 | import java.io.IOException; |
| 27 | |
| 28 | class PortFilter implements Filter { |
| 29 | private static final String ATTR_EQUALS = "equals"; |
| 30 | private static final String ATTR_MIN = "min"; |
| 31 | private static final String ATTR_MAX = "max"; |
| 32 | |
| 33 | private static final int NO_BOUND = -1; |
| 34 | |
| 35 | // both bounds are inclusive |
| 36 | private final int mLowerBound; |
| 37 | private final int mUpperBound; |
| 38 | |
| 39 | private PortFilter(int lowerBound, int upperBound) { |
| 40 | mLowerBound = lowerBound; |
| 41 | mUpperBound = upperBound; |
| 42 | } |
| 43 | |
| 44 | @Override |
Ben Gruver | f5323fe | 2013-07-31 15:09:51 -0700 | [diff] [blame] | 45 | public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent, |
| 46 | int callerUid, int callerPid, String resolvedType, ApplicationInfo resolvedApp) { |
Ben Gruver | 4efe940 | 2013-04-02 21:18:41 -0700 | [diff] [blame] | 47 | int port = -1; |
| 48 | Uri uri = intent.getData(); |
| 49 | if (uri != null) { |
| 50 | port = uri.getPort(); |
| 51 | } |
| 52 | return port != -1 && |
| 53 | (mLowerBound == NO_BOUND || mLowerBound <= port) && |
| 54 | (mUpperBound == NO_BOUND || mUpperBound >= port); |
| 55 | } |
| 56 | |
| 57 | public static final FilterFactory FACTORY = new FilterFactory("port") { |
| 58 | @Override |
| 59 | public Filter newFilter(XmlPullParser parser) |
| 60 | throws IOException, XmlPullParserException { |
| 61 | int lowerBound = NO_BOUND; |
| 62 | int upperBound = NO_BOUND; |
| 63 | |
| 64 | String equalsValue = parser.getAttributeValue(null, ATTR_EQUALS); |
| 65 | if (equalsValue != null) { |
| 66 | int value; |
| 67 | try { |
| 68 | value = Integer.parseInt(equalsValue); |
| 69 | } catch (NumberFormatException ex) { |
| 70 | throw new XmlPullParserException("Invalid port value: " + equalsValue, |
| 71 | parser, null); |
| 72 | } |
| 73 | lowerBound = value; |
| 74 | upperBound = value; |
| 75 | } |
| 76 | |
| 77 | String lowerBoundString = parser.getAttributeValue(null, ATTR_MIN); |
| 78 | String upperBoundString = parser.getAttributeValue(null, ATTR_MAX); |
| 79 | if (lowerBoundString != null || upperBoundString != null) { |
| 80 | if (equalsValue != null) { |
| 81 | throw new XmlPullParserException( |
| 82 | "Port filter cannot use both equals and range filtering", |
| 83 | parser, null); |
| 84 | } |
| 85 | |
| 86 | if (lowerBoundString != null) { |
| 87 | try { |
| 88 | lowerBound = Integer.parseInt(lowerBoundString); |
| 89 | } catch (NumberFormatException ex) { |
| 90 | throw new XmlPullParserException( |
| 91 | "Invalid minimum port value: " + lowerBoundString, |
| 92 | parser, null); |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | if (upperBoundString != null) { |
| 97 | try { |
| 98 | upperBound = Integer.parseInt(upperBoundString); |
| 99 | } catch (NumberFormatException ex) { |
| 100 | throw new XmlPullParserException( |
| 101 | "Invalid maximum port value: " + upperBoundString, |
| 102 | parser, null); |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | // an empty port filter is explicitly allowed, and checks for the existence of a port |
| 108 | return new PortFilter(lowerBound, upperBound); |
| 109 | } |
| 110 | }; |
| 111 | } |