Merge "Revert "Move Inet[4]AddressUtils to libs/net"" am: 55d6e27887 (09a8b68f) · Commits · e / os / android_frameworks_base

Android.bp

+4 −0

Original line number	Diff line number	Diff line
		@@ -717,6 +717,7 @@ filegroup {
		"core/java/com/android/internal/util/TrafficStatsConstants.java",
		"core/java/com/android/internal/util/WakeupMessage.java",
		"core/java/com/android/internal/util/TokenBucket.java",
		"core/java/android/net/shared/*.java",
		],
		}

		@@ -726,6 +727,7 @@ java_library {
		name: "framework-wifi-util-lib",
		sdk_version: "module_current",
		srcs: [
		"core/java/android/net/shared/Inet4AddressUtils.java",
		"core/java/com/android/internal/util/Preconditions.java",
		],
		libs: [
		@@ -742,6 +744,7 @@ filegroup {
		name: "framework-services-net-module-wifi-shared-srcs",
		srcs: [
		"core/java/android/net/DhcpResults.java",
		"core/java/android/net/shared/InetAddressUtils.java",
		"core/java/android/net/util/IpUtils.java",
		"core/java/android/util/LocalLog.java",
		],
		@@ -758,6 +761,7 @@ filegroup {
		"core/java/com/android/internal/util/State.java",
		"core/java/com/android/internal/util/StateMachine.java",
		"core/java/com/android/internal/util/TrafficStatsConstants.java",
		"core/java/android/net/shared/Inet4AddressUtils.java",
		],
		}

core/java/android/net/DhcpResults.java

+1 −2

Original line number	Diff line number	Diff line
		@@ -18,13 +18,12 @@ package android.net;

		import android.annotation.Nullable;
		import android.compat.annotation.UnsupportedAppUsage;
		import android.net.shared.InetAddressUtils;
		import android.os.Parcel;
		import android.os.Parcelable;
		import android.text.TextUtils;
		import android.util.Log;

		import com.android.net.module.util.InetAddressUtils;

		import java.net.Inet4Address;
		import java.net.InetAddress;
		import java.util.ArrayList;

core/java/android/net/NetworkUtils.java

+1 −2

Original line number	Diff line number	Diff line
		@@ -21,14 +21,13 @@ import static android.system.OsConstants.AF_INET6;

		import android.annotation.NonNull;
		import android.compat.annotation.UnsupportedAppUsage;
		import android.net.shared.Inet4AddressUtils;
		import android.os.Build;
		import android.system.ErrnoException;
		import android.system.Os;
		import android.util.Log;
		import android.util.Pair;

		import com.android.net.module.util.Inet4AddressUtils;

		import java.io.FileDescriptor;
		import java.math.BigInteger;
		import java.net.Inet4Address;

core/java/android/net/StaticIpConfiguration.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -21,11 +21,11 @@ import android.annotation.Nullable;
		import android.annotation.SystemApi;
		import android.annotation.TestApi;
		import android.compat.annotation.UnsupportedAppUsage;
		import android.net.shared.InetAddressUtils;
		import android.os.Parcel;
		import android.os.Parcelable;

		import com.android.internal.util.Preconditions;
		import com.android.net.module.util.InetAddressUtils;

		import java.net.InetAddress;
		import java.util.ArrayList;

core/java/android/net/shared/Inet4AddressUtils.java

0 → 100644

+166 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2019 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package android.net.shared;

		import java.net.Inet4Address;
		import java.net.InetAddress;
		import java.net.UnknownHostException;

		/**
		* Collection of utilities to work with IPv4 addresses.
		* @hide
		*/
		public class Inet4AddressUtils {

		/**
		* Convert a IPv4 address from an integer to an InetAddress (0x04030201 -> 1.2.3.4)
		*
		* <p>This method uses the higher-order int bytes as the lower-order IPv4 address bytes,
		* which is an unusual convention. Consider {@link #intToInet4AddressHTH(int)} instead.
		* @param hostAddress an int coding for an IPv4 address, where higher-order int byte is
		* lower-order IPv4 address byte
		*/
		public static Inet4Address intToInet4AddressHTL(int hostAddress) {
		return intToInet4AddressHTH(Integer.reverseBytes(hostAddress));
		}

		/**
		* Convert a IPv4 address from an integer to an InetAddress (0x01020304 -> 1.2.3.4)
		* @param hostAddress an int coding for an IPv4 address
		*/
		public static Inet4Address intToInet4AddressHTH(int hostAddress) {
		byte[] addressBytes = { (byte) (0xff & (hostAddress >> 24)),
		(byte) (0xff & (hostAddress >> 16)),
		(byte) (0xff & (hostAddress >> 8)),
		(byte) (0xff & hostAddress) };

		try {
		return (Inet4Address) InetAddress.getByAddress(addressBytes);
		} catch (UnknownHostException e) {
		throw new AssertionError();
		}
		}

		/**
		* Convert an IPv4 address from an InetAddress to an integer (1.2.3.4 -> 0x01020304)
		*
		* <p>This conversion can help order IP addresses: considering the ordering
		* 192.0.2.1 < 192.0.2.2 < ..., resulting ints will follow that ordering if read as unsigned
		* integers with {@link Integer#toUnsignedLong}.
		* @param inetAddr is an InetAddress corresponding to the IPv4 address
		* @return the IP address as integer
		*/
		public static int inet4AddressToIntHTH(Inet4Address inetAddr)
		throws IllegalArgumentException {
		byte [] addr = inetAddr.getAddress();
		return ((addr[0] & 0xff) << 24) \| ((addr[1] & 0xff) << 16)
		\| ((addr[2] & 0xff) << 8) \| (addr[3] & 0xff);
		}

		/**
		* Convert a IPv4 address from an InetAddress to an integer (1.2.3.4 -> 0x04030201)
		*
		* <p>This method stores the higher-order IPv4 address bytes in the lower-order int bytes,
		* which is an unusual convention. Consider {@link #inet4AddressToIntHTH(Inet4Address)} instead.
		* @param inetAddr is an InetAddress corresponding to the IPv4 address
		* @return the IP address as integer
		*/
		public static int inet4AddressToIntHTL(Inet4Address inetAddr) {
		return Integer.reverseBytes(inet4AddressToIntHTH(inetAddr));
		}

		/**
		* Convert a network prefix length to an IPv4 netmask integer (prefixLength 17 -> 0xffff8000)
		* @return the IPv4 netmask as an integer
		*/
		public static int prefixLengthToV4NetmaskIntHTH(int prefixLength)
		throws IllegalArgumentException {
		if (prefixLength < 0 \|\| prefixLength > 32) {
		throw new IllegalArgumentException("Invalid prefix length (0 <= prefix <= 32)");
		}
		// (int)a << b is equivalent to a << (b & 0x1f): can't shift by 32 (-1 << 32 == -1)
		return prefixLength == 0 ? 0 : 0xffffffff << (32 - prefixLength);
		}

		/**
		* Convert a network prefix length to an IPv4 netmask integer (prefixLength 17 -> 0x0080ffff).
		*
		* <p>This method stores the higher-order IPv4 address bytes in the lower-order int bytes,
		* which is an unusual convention. Consider {@link #prefixLengthToV4NetmaskIntHTH(int)} instead.
		* @return the IPv4 netmask as an integer
		*/
		public static int prefixLengthToV4NetmaskIntHTL(int prefixLength)
		throws IllegalArgumentException {
		return Integer.reverseBytes(prefixLengthToV4NetmaskIntHTH(prefixLength));
		}

		/**
		* Convert an IPv4 netmask to a prefix length, checking that the netmask is contiguous.
		* @param netmask as a {@code Inet4Address}.
		* @return the network prefix length
		* @throws IllegalArgumentException the specified netmask was not contiguous.
		* @hide
		*/
		public static int netmaskToPrefixLength(Inet4Address netmask) {
		// inetAddressToInt returns an int in network byte order.
		int i = inet4AddressToIntHTH(netmask);
		int prefixLength = Integer.bitCount(i);
		int trailingZeros = Integer.numberOfTrailingZeros(i);
		if (trailingZeros != 32 - prefixLength) {
		throw new IllegalArgumentException("Non-contiguous netmask: " + Integer.toHexString(i));
		}
		return prefixLength;
		}

		/**
		* Returns the implicit netmask of an IPv4 address, as was the custom before 1993.
		*/
		public static int getImplicitNetmask(Inet4Address address) {
		int firstByte = address.getAddress()[0] & 0xff; // Convert to an unsigned value.
		if (firstByte < 128) {
		return 8;
		} else if (firstByte < 192) {
		return 16;
		} else if (firstByte < 224) {
		return 24;
		} else {
		return 32; // Will likely not end well for other reasons.
		}
		}

		/**
		* Get the broadcast address for a given prefix.
		*
		* <p>For example 192.168.0.1/24 -> 192.168.0.255
		*/
		public static Inet4Address getBroadcastAddress(Inet4Address addr, int prefixLength)
		throws IllegalArgumentException {
		final int intBroadcastAddr = inet4AddressToIntHTH(addr)
		\| ~prefixLengthToV4NetmaskIntHTH(prefixLength);
		return intToInet4AddressHTH(intBroadcastAddr);
		}

		/**
		* Get a prefix mask as Inet4Address for a given prefix length.
		*
		* <p>For example 20 -> 255.255.240.0
		*/
		public static Inet4Address getPrefixMaskAsInet4Address(int prefixLength)
		throws IllegalArgumentException {
		return intToInet4AddressHTH(prefixLengthToV4NetmaskIntHTH(prefixLength));
		}
		}