| // Copyright (C) 2008 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.google.gerrit.server.ssh; |
| |
| import com.google.gwtjsonrpc.server.XsrfException; |
| import com.google.gwtorm.client.OrmException; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.net.Inet6Address; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.SocketException; |
| import java.net.UnknownHostException; |
| |
| import javax.servlet.ServletConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| /** |
| * Servlet hosting an SSH daemon on another port. During a standard HTTP GET |
| * request the servlet returns the hostname and port number back to the client |
| * in the form <code>${host} ${port}</code>. |
| * <p> |
| * Use a Git URL such as <code>ssh://${email}@${host}:${port}/${path}</code>, |
| * e.g. <code>ssh://sop@google.com@gerrit.com:8010/tools/gerrit.git</code> to |
| * access the SSH daemon itself. |
| * <p> |
| * Versions of Git before 1.5.3 may require setting the username and port |
| * properties in the user's <code>~/.ssh/config</code> file, and using a host |
| * alias through a URL such as <code>gerrit-alias:/tools/gerrit.git: |
| * <pre> |
| * Host gerrit-alias |
| * User sop@google.com |
| * Hostname gerrit.com |
| * Port 8010 |
| * </pre> |
| */ |
| @SuppressWarnings("serial") |
| public class SshServlet extends HttpServlet { |
| @Override |
| public void init(final ServletConfig config) throws ServletException { |
| super.init(config); |
| try { |
| GerritSshDaemon.startSshd(); |
| } catch (SocketException e) { |
| throw new ServletException(e); |
| } catch (OrmException e) { |
| throw new ServletException(e); |
| } catch (XsrfException e) { |
| throw new ServletException(e); |
| } |
| } |
| |
| @Override |
| public void destroy() { |
| GerritSshDaemon.stopSshd(); |
| super.destroy(); |
| } |
| |
| @Override |
| protected void doGet(final HttpServletRequest req, |
| final HttpServletResponse rsp) throws IOException { |
| rsp.setHeader("Expires", "Fri, 01 Jan 1980 00:00:00 GMT"); |
| rsp.setHeader("Pragma", "no-cache"); |
| rsp.setHeader("Cache-Control", "no-cache, must-revalidate"); |
| |
| final InetSocketAddress addr = GerritSshDaemon.getAddress(); |
| final String out; |
| if (addr != null) { |
| final InetAddress ip = addr.getAddress(); |
| String host; |
| if (ip != null && ip.isAnyLocalAddress()) { |
| host = req.getServerName(); |
| } else if (ip instanceof Inet6Address) { |
| host = "[" + addr.getHostName() + "]"; |
| } else { |
| host = addr.getHostName(); |
| } |
| out = host + " " + addr.getPort(); |
| } else { |
| out = "NOT_AVAILABLE"; |
| } |
| |
| rsp.setCharacterEncoding("UTF-8"); |
| rsp.setContentType("text/plain"); |
| final PrintWriter w = rsp.getWriter(); |
| try { |
| w.write(out); |
| } finally { |
| w.close(); |
| } |
| } |
| } |