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/*
* 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.unix;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;
import org.apache.sshd.agent.common.AbstractAgentProxy;
import org.apache.sshd.common.SshException;
import org.apache.sshd.common.util.Buffer;
import org.apache.tomcat.jni.Local;
import org.apache.tomcat.jni.Pool;
import org.apache.tomcat.jni.Socket;
import org.apache.tomcat.jni.Status;
/**
* A client for a remote SSH agent
*/
public class AgentClient
extends AbstractAgentProxy
implements Runnable {
private final String authSocket
;
private final long pool
;
private final long handle
;
private final Buffer receiveBuffer
;
private final Queue<Buffer> messages
;
private boolean closed
;
public AgentClient
(String authSocket
) throws IOException {
try {
this.
authSocket = authSocket
;
pool = Pool.
create(AprLibrary.
getInstance().
getRootPool());
handle = Local.
create(authSocket, pool
);
int result = Local.
connect(handle,
0);
if (result
!= Status.
APR_SUCCESS) {
throwException
(result
);
}
receiveBuffer =
new Buffer();
messages =
new ArrayBlockingQueue<Buffer>(10);
new Thread(this).
start();
} catch (IOException e
) {
throw e
;
} catch (Exception e
) {
throw new SshException
(e
);
}
}
public void run
() {
try {
byte[] buf =
new byte[1024];
while (!closed
) {
int result =
Socket.
recv(handle, buf,
0, buf.
length);
if (result
< Status.
APR_SUCCESS) {
throwException
(result
);
}
messageReceived
(new Buffer(buf,
0, result
));
}
} catch (Exception e
) {
if (!closed
) {
e.
printStackTrace();
}
} finally {
close
();
}
}
protected void messageReceived
(Buffer buffer
) throws Exception {
Buffer message =
null;
synchronized (receiveBuffer
) {
receiveBuffer.
putBuffer(buffer
);
if (receiveBuffer.
available() >=
4) {
int rpos = receiveBuffer.
rpos();
int len = receiveBuffer.
getInt();
receiveBuffer.
rpos(rpos
);
if (receiveBuffer.
available() >=
4 + len
) {
message =
new Buffer(receiveBuffer.
getBytes());
receiveBuffer.
compact();
}
}
}
if (message
!=
null) {
synchronized (messages
) {
messages.
offer(message
);
messages.
notifyAll();
}
}
}
public void close
() {
if (!closed
) {
closed =
true;
Socket.
close(handle
);
}
}
protected synchronized Buffer request
(Buffer buffer
) throws IOException {
int wpos = buffer.
wpos();
buffer.
wpos(0);
buffer.
putInt(wpos -
4);
buffer.
wpos(wpos
);
synchronized (messages
) {
try {
int result =
Socket.
send(handle, buffer.
array(), buffer.
rpos(), buffer.
available());
if (result
< Status.
APR_SUCCESS) {
throwException
(result
);
}
if (messages.
isEmpty()) {
messages.
wait();
}
return messages.
poll();
} catch (InterruptedException e
) {
throw (IOException) new InterruptedIOException().
initCause(e
);
}
}
}
/**
* transform an APR error number in a more fancy exception
* @param code APR error code
* @throws java.io.IOException the produced exception for the given APR error number
*/
private void throwException
(int code
) throws IOException {
throw new IOException(
org.
apache.
tomcat.
jni.
Error.
strerror(-code
) +
" (code: " + code +
")");
}
}