/*
|
* Copyright (C) 2009 The Android Open Source Project
|
* Copyright 2014 gitblit.com.
|
*
|
* 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.gitblit.transport.ssh.commands;
|
|
import java.io.IOException;
|
import java.io.InputStream;
|
import java.io.OutputStream;
|
import java.util.ArrayList;
|
import java.util.List;
|
import java.util.concurrent.ExecutorService;
|
import java.util.concurrent.Executors;
|
import java.util.concurrent.Future;
|
import java.util.concurrent.ScheduledExecutorService;
|
import java.util.concurrent.atomic.AtomicBoolean;
|
import java.util.concurrent.atomic.AtomicReference;
|
|
import org.apache.sshd.server.Command;
|
import org.apache.sshd.server.CommandFactory;
|
import org.apache.sshd.server.Environment;
|
import org.apache.sshd.server.ExitCallback;
|
import org.apache.sshd.server.SessionAware;
|
import org.apache.sshd.server.session.ServerSession;
|
import org.slf4j.Logger;
|
import org.slf4j.LoggerFactory;
|
|
import com.gitblit.Keys;
|
import com.gitblit.manager.IGitblit;
|
import com.gitblit.transport.ssh.SshDaemonClient;
|
import com.gitblit.utils.WorkQueue;
|
import com.google.common.util.concurrent.Atomics;
|
import com.google.common.util.concurrent.ThreadFactoryBuilder;
|
|
public class SshCommandFactory implements CommandFactory {
|
private static final Logger logger = LoggerFactory.getLogger(SshCommandFactory.class);
|
|
private final WorkQueue workQueue;
|
private final IGitblit gitblit;
|
private final ScheduledExecutorService startExecutor;
|
private final ExecutorService destroyExecutor;
|
|
public SshCommandFactory(IGitblit gitblit, WorkQueue workQueue) {
|
this.gitblit = gitblit;
|
this.workQueue = workQueue;
|
|
int threads = gitblit.getSettings().getInteger(Keys.git.sshCommandStartThreads, 2);
|
startExecutor = workQueue.createQueue(threads, "SshCommandStart");
|
destroyExecutor = Executors.newSingleThreadExecutor(
|
new ThreadFactoryBuilder()
|
.setNameFormat("SshCommandDestroy-%s")
|
.setDaemon(true)
|
.build());
|
}
|
|
public void stop() {
|
destroyExecutor.shutdownNow();
|
}
|
|
public RootDispatcher createRootDispatcher(SshDaemonClient client, String commandLine) {
|
return new RootDispatcher(gitblit, client, commandLine, workQueue);
|
}
|
|
@Override
|
public Command createCommand(final String commandLine) {
|
return new Trampoline(commandLine);
|
}
|
|
private class Trampoline implements Command, SessionAware {
|
private final String[] argv;
|
private ServerSession session;
|
private InputStream in;
|
private OutputStream out;
|
private OutputStream err;
|
private ExitCallback exit;
|
private Environment env;
|
private String cmdLine;
|
private DispatchCommand cmd;
|
private final AtomicBoolean logged;
|
private final AtomicReference<Future<?>> task;
|
|
Trampoline(String line) {
|
if (line.startsWith("git-")) {
|
line = "git " + line;
|
}
|
cmdLine = line;
|
argv = split(line);
|
logged = new AtomicBoolean();
|
task = Atomics.newReference();
|
}
|
|
@Override
|
public void setSession(ServerSession session) {
|
this.session = session;
|
}
|
|
@Override
|
public void setInputStream(final InputStream in) {
|
this.in = in;
|
}
|
|
@Override
|
public void setOutputStream(final OutputStream out) {
|
this.out = out;
|
}
|
|
@Override
|
public void setErrorStream(final OutputStream err) {
|
this.err = err;
|
}
|
|
@Override
|
public void setExitCallback(final ExitCallback callback) {
|
this.exit = callback;
|
}
|
|
@Override
|
public void start(final Environment env) throws IOException {
|
this.env = env;
|
task.set(startExecutor.submit(new Runnable() {
|
@Override
|
public void run() {
|
try {
|
onStart();
|
} catch (Exception e) {
|
logger.warn("Cannot start command ", e);
|
}
|
}
|
|
@Override
|
public String toString() {
|
return "start (user " + session.getUsername() + ")";
|
}
|
}));
|
}
|
|
private void onStart() throws IOException {
|
synchronized (this) {
|
SshDaemonClient client = session.getAttribute(SshDaemonClient.KEY);
|
try {
|
cmd = createRootDispatcher(client, cmdLine);
|
cmd.setArguments(argv);
|
cmd.setInputStream(in);
|
cmd.setOutputStream(out);
|
cmd.setErrorStream(err);
|
cmd.setExitCallback(new ExitCallback() {
|
@Override
|
public void onExit(int rc, String exitMessage) {
|
exit.onExit(translateExit(rc), exitMessage);
|
log(rc);
|
}
|
|
@Override
|
public void onExit(int rc) {
|
exit.onExit(translateExit(rc));
|
log(rc);
|
}
|
});
|
cmd.start(env);
|
} finally {
|
client = null;
|
}
|
}
|
}
|
|
private int translateExit(final int rc) {
|
switch (rc) {
|
case BaseCommand.STATUS_NOT_ADMIN:
|
return 1;
|
|
case BaseCommand.STATUS_CANCEL:
|
return 15 /* SIGKILL */;
|
|
case BaseCommand.STATUS_NOT_FOUND:
|
return 127 /* POSIX not found */;
|
|
default:
|
return rc;
|
}
|
}
|
|
private void log(final int rc) {
|
if (logged.compareAndSet(false, true)) {
|
logger.info("onExecute: {} exits with: {}", cmd.getClass().getSimpleName(), rc);
|
}
|
}
|
|
@Override
|
public void destroy() {
|
Future<?> future = task.getAndSet(null);
|
if (future != null) {
|
future.cancel(true);
|
destroyExecutor.execute(new Runnable() {
|
@Override
|
public void run() {
|
onDestroy();
|
}
|
});
|
}
|
}
|
|
private void onDestroy() {
|
synchronized (this) {
|
if (cmd != null) {
|
try {
|
cmd.destroy();
|
} finally {
|
cmd = null;
|
}
|
}
|
}
|
}
|
}
|
|
/** Split a command line into a string array. */
|
static public String[] split(String commandLine) {
|
final List<String> list = new ArrayList<String>();
|
boolean inquote = false;
|
boolean inDblQuote = false;
|
StringBuilder r = new StringBuilder();
|
for (int ip = 0; ip < commandLine.length();) {
|
final char b = commandLine.charAt(ip++);
|
switch (b) {
|
case '\t':
|
case ' ':
|
if (inquote || inDblQuote)
|
r.append(b);
|
else if (r.length() > 0) {
|
list.add(r.toString());
|
r = new StringBuilder();
|
}
|
continue;
|
case '\"':
|
if (inquote)
|
r.append(b);
|
else
|
inDblQuote = !inDblQuote;
|
continue;
|
case '\'':
|
if (inDblQuote)
|
r.append(b);
|
else
|
inquote = !inquote;
|
continue;
|
case '\\':
|
if (inquote || ip == commandLine.length())
|
r.append(b); // literal within a quote
|
else
|
r.append(commandLine.charAt(ip++));
|
continue;
|
default:
|
r.append(b);
|
continue;
|
}
|
}
|
if (r.length() > 0) {
|
list.add(r.toString());
|
}
|
return list.toArray(new String[list.size()]);
|
}
|
}
|
