/*
* 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.OutputStream;
import org.apache.sshd.agent.SshAgent;
import org.apache.sshd.client.future.DefaultOpenFuture;
import org.apache.sshd.client.future.OpenFuture;
import org.apache.sshd.common.Channel;
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.channel.ChannelOutputStream;
import org.apache.sshd.common.future.CloseFuture;
import org.apache.sshd.common.future.SshFuture;
import org.apache.sshd.common.future.SshFutureListener;
import org.apache.sshd.common.util.Buffer;
import org.apache.sshd.server.channel.AbstractServerChannel;
import org.apache.tomcat.jni.Local;
import org.apache.tomcat.jni.Pool;
import org.apache.tomcat.jni.Socket;
import org.apache.tomcat.jni.Status;
/**
* The client side channel that will receive requests forwards by the SSH server.
*/
public class ChannelAgentForwarding extends AbstractServerChannel {
public static class Factory implements NamedFactory<Channel> {
public String getName() {
return "auth-agent@openssh.com";
}
public Channel create() {
return new ChannelAgentForwarding();
}
}
private String authSocket;
private long pool;
private long handle;
private Thread thread;
private OutputStream out;
public ChannelAgentForwarding() {
}
protected OpenFuture doInit(Buffer buffer) {
final OpenFuture f = new DefaultOpenFuture(this);
try {
out = new ChannelOutputStream(this, remoteWindow, log, SshConstants.SSH_MSG_CHANNEL_DATA);
authSocket = session.getFactoryManager().getProperties().get(SshAgent.SSH_AUTHSOCKET_ENV_NAME);
pool = Pool.create(AprLibrary.getInstance().getRootPool());
handle = Local.create(authSocket, pool);
int result = Local.connect(handle, 0);
if (result != Status.APR_SUCCESS) {
throwException(result);
}
thread = new Thread() {
public void run() {
try {
byte[] buf = new byte[1024];
while (true) {
int len = Socket.recv(handle, buf, 0, buf.length);
if (len > 0) {
out.write(buf, 0, len);
out.flush();
}
}
} catch (IOException e) {
close(true);
}
}
};
thread.start();
f.setOpened();
} catch (Exception e) {
f.setException(e);
}
return f;
}
private void closeImmediately0() {
// We need to close the channel immediately to remove it from the
// server session's channel table and *not* send a packet to the
// client. A notification was already sent by our caller, or will
// be sent after we return.
//
super.close(true);
// We also need to close the socket.
//
Socket.close(handle);
}
public CloseFuture close(boolean immediately) {
return super.close(immediately).addListener(new SshFutureListener<CloseFuture>() {
public void operationComplete(CloseFuture sshFuture) {
closeImmediately0();
}
});
}
@Override
public void handleEof() throws IOException {
super.handleEof();
// close(true);
}
protected void doWriteData(byte[] data, int off, int len) throws IOException {
int result = Socket.send(handle, data, off, len);
if (result < Status.APR_SUCCESS) {
throwException(result);
}
}
protected void doWriteExtendedData(byte[] data, int off, int len) throws IOException {
throw new UnsupportedOperationException("AgentForward channel does not support extended data");
}
/**
* 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 + ")");
}
}