1 /* 2 * Copyright (C) 2020 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.internal.net.ipsec.ike.net; 18 19 import android.net.Network; 20 import android.system.ErrnoException; 21 import android.system.Os; 22 import android.system.OsConstants; 23 24 import java.io.FileDescriptor; 25 import java.io.IOException; 26 import java.net.InetAddress; 27 import java.net.InetSocketAddress; 28 29 /** 30 * IkeLocalAddressGenerator generates a local IP address for the given Network using the specified 31 * address family, remote address, and server port number. 32 */ 33 public class IkeLocalAddressGenerator { 34 /** Generate and return a local IP address on the specified Network. */ generateLocalAddress( Network network, boolean isIpv4, InetAddress remoteAddress, int serverPort)35 public InetAddress generateLocalAddress( 36 Network network, boolean isIpv4, InetAddress remoteAddress, int serverPort) 37 throws ErrnoException, IOException { 38 FileDescriptor sock = 39 Os.socket( 40 isIpv4 ? OsConstants.AF_INET : OsConstants.AF_INET6, 41 OsConstants.SOCK_DGRAM, 42 OsConstants.IPPROTO_UDP); 43 network.bindSocket(sock); 44 Os.connect(sock, remoteAddress, serverPort); 45 InetSocketAddress localAddr = (InetSocketAddress) Os.getsockname(sock); 46 Os.close(sock); 47 48 return localAddr.getAddress(); 49 } 50 } 51