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/*
* 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 com.android.ike.ikev2;
import android.net.IpSecManager.UdpEncapsulationSocket;
import com.android.ike.ikev2.message.IkePayload;
import java.net.InetAddress;
import java.util.LinkedList;
import java.util.List;
/**
* IkeSessionOptions contains all user provided configurations for negotiating an IKE SA.
*
* <p>TODO: Make this doc more user-friendly.
*/
public final class IkeSessionOptions {
private final InetAddress mServerAddress;
private final UdpEncapsulationSocket mUdpEncapSocket;
private final SaProposal[] mSaProposals;
private final boolean mIsIkeFragmentationSupported;
private IkeSessionOptions(
InetAddress serverAddress,
UdpEncapsulationSocket udpEncapsulationSocket,
SaProposal[] proposals,
boolean isIkeFragmentationSupported) {
mServerAddress = serverAddress;
mUdpEncapSocket = udpEncapsulationSocket;
mSaProposals = proposals;
mIsIkeFragmentationSupported = isIkeFragmentationSupported;
}
/** Package private */
InetAddress getServerAddress() {
return mServerAddress;
}
/** Package private */
UdpEncapsulationSocket getUdpEncapsulationSocket() {
return mUdpEncapSocket;
}
/** Package private */
SaProposal[] getSaProposals() {
return mSaProposals;
}
/** Package private */
boolean isIkeFragmentationSupported() {
return mIsIkeFragmentationSupported;
}
/** This class can be used to incrementally construct a IkeSessionOptions. */
public static final class Builder {
private final InetAddress mServerAddress;
private final UdpEncapsulationSocket mUdpEncapSocket;
private final List<SaProposal> mSaProposalList = new LinkedList<>();
private boolean mIsIkeFragmentationSupported = false;
/**
* Returns a new Builder for an IkeSessionOptions.
*
* @param serverAddress IP address of remote IKE server.
* @param udpEncapsulationSocket {@link IpSecManager.UdpEncapsulationSocket} for sending and
* receiving IKE message.
* @return Builder for an IkeSessionOptions.
*/
public Builder(InetAddress serverAddress, UdpEncapsulationSocket udpEncapsulationSocket) {
mServerAddress = serverAddress;
mUdpEncapSocket = udpEncapsulationSocket;
}
/**
* Adds an IKE SA proposal to IkeSessionOptions being built.
*
* @param proposal IKE SA proposal.
* @return Builder for an IkeSessionOptions.
* @throws IllegalArgumentException if input proposal is not IKE SA proposal.
*/
public Builder addSaProposal(SaProposal proposal) {
if (proposal.getProtocolId() != IkePayload.PROTOCOL_ID_IKE) {
throw new IllegalArgumentException(
"Expected IKE SA Proposal but received Child SA proposal");
}
mSaProposalList.add(proposal);
return this;
}
/**
* Validates, builds and returns the IkeSessionOptions
*
* @return IkeSessionOptions the validated IkeSessionOptions
* @throws IllegalStateException if no IKE SA proposal is provided
*/
public IkeSessionOptions build() {
if (mSaProposalList.isEmpty()) {
throw new IllegalArgumentException("IKE SA proposal not found");
}
return new IkeSessionOptions(
mServerAddress,
mUdpEncapSocket,
mSaProposalList.toArray(new SaProposal[mSaProposalList.size()]),
mIsIkeFragmentationSupported);
}
// TODO: add methods for supporting IKE fragmentation.
}
}
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