/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.sshd.agent.local;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;
import org.apache.sshd.agent.SshAgent;
import org.apache.sshd.agent.common.AbstractAgentProxy;
import org.apache.sshd.client.channel.AbstractClientChannel;
import org.apache.sshd.client.future.OpenFuture;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.channel.ChannelOutputStream;
import org.apache.sshd.common.util.Buffer;
public class AgentForwardedChannel extends AbstractClientChannel {
private final Queue<Buffer> messages = new ArrayBlockingQueue<Buffer>(10);
private final Buffer receiveBuffer = new Buffer();
public AgentForwardedChannel() {
super("auth-agent@openssh.com");
}
public SshAgent getAgent() {
return new AbstractAgentProxy() {
@Override
protected Buffer request(Buffer buffer) throws IOException {
return AgentForwardedChannel.this.request(buffer);
}
public void close() {
AgentForwardedChannel.this.close(false);
}
};
}
protected Buffer request(Buffer buffer) throws IOException {
synchronized (messages) {
try {
getInvertedIn().write(buffer.array(), buffer.rpos(), buffer.available());
getInvertedIn().flush();
localWindow.consumeAndCheck(buffer.available());
if (messages.isEmpty()) {
messages.wait();
}
return messages.poll();
} catch (InterruptedException e) {
throw (IOException) new InterruptedIOException().initCause(e);
}
}
}
public OpenFuture open() throws IOException {
return internalOpen();
}
@Override
protected void doOpen() throws IOException {
invertedIn = new ChannelOutputStream(this, remoteWindow, log, SshConstants.Message.SSH_MSG_CHANNEL_DATA);
}
protected void doWriteData(byte[] data, int off, int len) throws IOException {
Buffer message = null;
synchronized (receiveBuffer) {
receiveBuffer.putBuffer(new Buffer(data, off, len));
if (receiveBuffer.available() >= 4) {
off = receiveBuffer.rpos();
len = receiveBuffer.getInt();
receiveBuffer.rpos(off);
if (receiveBuffer.available() >= 4 + len) {
message = new Buffer(receiveBuffer.getBytes());
receiveBuffer.compact();
}
}
}
if (message != null) {
synchronized (messages) {
messages.offer(message);
messages.notifyAll();
}
}
}
}