commit 51e7588fdb822a95c73953a4d25303992579c3dd

Author: Iyappan Srinivasan <iyappans@yahoo-inc.com>
Date:   Wed Jul 28 08:43:25 2010 +0000

    MAPREDUCE-1882 https://issues.apache.org/jira/secure/attachment/12450393/1882-ydist-security-patch.txt


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-patches@1077610 13f79535-47bb-0310-9956-ffa450edef68

src/test/system/java/shared/org/apache/hadoop/common/RemoteExecution.java

@@ -0,0 +1,97 @@
+/**
+ * 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.hadoop.common;
+
+import com.jcraft.jsch.*;
+import org.apache.commons.logging.LogFactory;
+import org.apache.commons.logging.Log;
+import java.io.InputStream;
+
+/**
+ * Remote Execution of commands or any other utility on a remote machine.
+ */
+
+public class RemoteExecution {
+
+  static final Log LOG = LogFactory.
+      getLog(RemoteExecution.class);
+
+  static String rsaOrDsaFileName = "id_dsa";
+
+  public RemoteExecution() throws Exception {
+  }
+
+  /**
+   * Execute command at remoteNode. 
+   * @param JotTracker Client HostName, username provided,
+   * command to be executed remotely.
+   * @return void
+   */
+  public static void executeCommand(String jtClientHostName, String user, 
+      String  command) throws Exception {
+
+    JSch jsch = new JSch();
+
+    Session session = jsch.getSession(user, jtClientHostName, 22);
+    jsch.setKnownHosts("/homes/" + user + "/.ssh/known_hosts");
+    jsch.addIdentity("/homes/" + user + "/.ssh/" + rsaOrDsaFileName);
+    java.util.Properties config = new java.util.Properties();
+    config.put("StrictHostKeyChecking", "no");
+    session.setConfig(config);
+
+    session.connect(30000);   // making a connection with timeout.
+
+    Channel channel=session.openChannel("exec");
+    ((ChannelExec)channel).setCommand(command);
+    channel.setInputStream(null);
+   
+    ((ChannelExec)channel).setErrStream(System.err);
+   
+    InputStream in = channel.getInputStream();
+    channel.connect();
+    byte[] tmp = new byte[1024];
+    while(true) {
+      while(in.available()>0){
+        int i=in.read(tmp, 0, 1024);
+        if(i<0)break;
+           System.out.print(new String(tmp, 0, i));
+           LOG.info(new String(tmp, 0, i));
+      }
+      if(channel.isClosed()){
+        System.out.println("exit-status: " + channel.getExitStatus());
+        break;
+      }
+      try{Thread.sleep(1000);}catch(Exception ee){ee.printStackTrace();}
+    }
+    channel.disconnect();
+    session.disconnect();
+  }
+
+  /**
+   * Execute command at remoteNode.
+   * @param JotTracker Client HostName, username provided,
+   * comamnd to be executed remotely, rsaOrDsaFileName to be found under .ssh.
+   * @return void
+   */
+  public static void executeCommand(String jtClientHostName, String user,
+      String  command, String rsaDsaFileName) throws Exception {
+      rsaOrDsaFileName = rsaDsaFileName;
+      executeCommand(jtClientHostName, user, command);
+  }
+}