private void authenticate() { try { if (connection.authenticateWithNone(profile.getUser())) { Log.d(TAG, "Authenticate with none"); return; } } catch (Exception e) { Log.d(TAG, "Host does not support 'none' authentication."); } try { if (connection.isAuthMethodAvailable(profile.getUser(), AUTH_PUBLICKEY)) { File f = new File(profile.getKeyPath()); if (f.exists()) if (profile.getPassword().equals("")) profile.setPassword(null); if (connection.authenticateWithPublicKey(profile.getUser(), f, profile.getPassword())) { Log.d(TAG, "Authenticate with public key"); return; } } } catch (Exception e) { Log.d(TAG, "Host does not support 'Public key' authentication."); } try { if (connection.isAuthMethodAvailable(profile.getUser(), AUTH_PASSWORD)) { if (connection.authenticateWithPassword(profile.getUser(), profile.getPassword())) { Log.d(TAG, "Authenticate with password"); return; } } } catch (IllegalStateException e) { Log.e(TAG, "Connection went away while we were trying to authenticate", e); } catch (Exception e) { Log.e(TAG, "Problem during handleAuthentication()", e); } // TODO: Need verification try { if (connection.isAuthMethodAvailable(profile.getUser(), AUTH_KEYBOARDINTERACTIVE)) { if (connection.authenticateWithKeyboardInteractive(profile.getUser(), this)) return; } } catch (Exception e) { Log.d(TAG, "Host does not support 'Keyboard-Interactive' authentication."); } }
@Override public Map<? extends ServerResource, Map<String, String>> find( long dcId, Long podId, Long clusterId, URI uri, String username, String password, List<String> hostTags) throws DiscoveryException { ClusterVO cluster = _clusterDao.findById(clusterId); if (cluster == null || cluster.getHypervisorType() != HypervisorType.KVM) { if (s_logger.isInfoEnabled()) s_logger.info("invalid cluster id or cluster is not for KVM hypervisors"); return null; } Map<KvmDummyResourceBase, Map<String, String>> resources = new HashMap<KvmDummyResourceBase, Map<String, String>>(); Map<String, String> details = new HashMap<String, String>(); if (!uri.getScheme().equals("http")) { String msg = "urlString is not http so we're not taking care of the discovery for this: " + uri; s_logger.debug(msg); return null; } com.trilead.ssh2.Connection sshConnection = null; String agentIp = null; try { String hostname = uri.getHost(); InetAddress ia = InetAddress.getByName(hostname); agentIp = ia.getHostAddress(); String guid = UUID.nameUUIDFromBytes(agentIp.getBytes()).toString(); String guidWithTail = guid + "-LibvirtComputingResource"; /*tail added by agent.java*/ if (_resourceMgr.findHostByGuid(guidWithTail) != null) { s_logger.debug( "Skipping " + agentIp + " because " + guidWithTail + " is already in the database."); return null; } sshConnection = new com.trilead.ssh2.Connection(agentIp, 22); sshConnection.connect(null, 60000, 60000); if (!sshConnection.authenticateWithPassword(username, password)) { s_logger.debug("Failed to authenticate"); throw new DiscoveredWithErrorException("Authentication error"); } if (!SSHCmdHelper.sshExecuteCmd(sshConnection, "lsmod|grep kvm", 3)) { s_logger.debug("It's not a KVM enabled machine"); return null; } List<PhysicalNetworkSetupInfo> netInfos = _networkMgr.getPhysicalNetworkInfo(dcId, HypervisorType.KVM); String kvmPrivateNic = _kvmPrivateNic; String kvmPublicNic = _kvmPublicNic; String kvmGuestNic = _kvmGuestNic; for (PhysicalNetworkSetupInfo info : netInfos) { if (info.getPrivateNetworkName() != null) { kvmPrivateNic = info.getPrivateNetworkName(); } if (info.getPublicNetworkName() != null) { kvmPublicNic = info.getPublicNetworkName(); } if (info.getGuestNetworkName() != null) { kvmGuestNic = info.getGuestNetworkName(); } } String parameters = " -m " + _hostIp + " -z " + dcId + " -p " + podId + " -c " + clusterId + " -g " + guid + " -a"; if (kvmPublicNic != null) { parameters += " --pubNic=" + kvmPublicNic; } if (kvmPrivateNic != null) { parameters += " --prvNic=" + kvmPrivateNic; } if (kvmGuestNic != null) { parameters += " --guestNic=" + kvmGuestNic; } SSHCmdHelper.sshExecuteCmd(sshConnection, "cloud-setup-agent " + parameters, 3); KvmDummyResourceBase kvmResource = new KvmDummyResourceBase(); Map<String, Object> params = new HashMap<String, Object>(); params.put("zone", Long.toString(dcId)); params.put("pod", Long.toString(podId)); params.put("cluster", Long.toString(clusterId)); params.put("guid", guid); params.put("agentIp", agentIp); kvmResource.configure("kvm agent", params); resources.put(kvmResource, details); HostVO connectedHost = waitForHostConnect(dcId, podId, clusterId, guidWithTail); if (connectedHost == null) return null; details.put("guid", guidWithTail); // place a place holder guid derived from cluster ID if (cluster.getGuid() == null) { cluster.setGuid(UUID.nameUUIDFromBytes(String.valueOf(clusterId).getBytes()).toString()); _clusterDao.update(clusterId, cluster); } // save user name and password _hostDao.loadDetails(connectedHost); Map<String, String> hostDetails = connectedHost.getDetails(); hostDetails.put("password", password); hostDetails.put("username", username); _hostDao.saveDetails(connectedHost); return resources; } catch (DiscoveredWithErrorException e) { throw e; } catch (Exception e) { String msg = " can't setup agent, due to " + e.toString() + " - " + e.getMessage(); s_logger.warn(msg); } finally { if (sshConnection != null) sshConnection.close(); } return null; }
public Result execute(Result previousResult, int nr) { Result result = previousResult; result.setResult(false); try { // Get real variable value String realServerName = environmentSubstitute(serverName); int realServerPort = Const.toInt(environmentSubstitute(serverPort), 22); String realUserName = environmentSubstitute(userName); String realServerPassword = Encr.decryptPasswordOptionallyEncrypted(environmentSubstitute(password)); // Proxy Host String realProxyHost = environmentSubstitute(httpproxyhost); int realProxyPort = Const.toInt(environmentSubstitute(httpproxyport), 22); String realproxyUserName = environmentSubstitute(httpproxyusername); String realProxyPassword = Encr.decryptPasswordOptionallyEncrypted(environmentSubstitute(httpProxyPassword)); // Key file String realKeyFilename = environmentSubstitute(keyFilename); String relKeyFilepass = environmentSubstitute(keyFilePass); // Source files String realLocalDirectory = environmentSubstitute(localDirectory); String realwildcard = environmentSubstitute(wildcard); // Remote destination String realftpDirectory = environmentSubstitute(ftpDirectory); // Destination folder (Move to) String realDestinationFolder = environmentSubstitute(destinationfolder); try { // Remote source realftpDirectory = FTPUtils.normalizePath(realftpDirectory); // Destination folder (Move to) realDestinationFolder = FTPUtils.normalizePath(realDestinationFolder); } catch (Exception e) { logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.CanNotNormalizePath", e.getMessage())); result.setNrErrors(1); return result; } // Check for mandatory fields boolean mandatoryok = true; if (Const.isEmpty(realServerName)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.ServernameMissing")); } if (usehttpproxy) { if (Const.isEmpty(realProxyHost)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.HttpProxyhostMissing")); } } if (publicpublickey) { if (Const.isEmpty(realKeyFilename)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.KeyFileMissing")); } else { // Let's check if folder exists... if (!KettleVFS.fileExists(realKeyFilename, this)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.KeyFileNotExist")); } } } if (Const.isEmpty(realLocalDirectory)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.LocalFolderMissing")); } if (afterFtpPut.equals("move_file")) { if (Const.isEmpty(realDestinationFolder)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.DestinatFolderMissing")); } else { FileObject folder = null; try { folder = KettleVFS.getFileObject(realDestinationFolder, this); // Let's check if folder exists... if (!folder.exists()) { // Do we need to create it? if (createDestinationFolder) { folder.createFolder(); } else { logError( BaseMessages.getString( PKG, "JobSSH2PUT.Log.DestinatFolderNotExist", realDestinationFolder)); } } } catch (Exception e) { throw new KettleException(e); } finally { if (folder != null) { try { folder.close(); folder = null; } catch (Exception e) { /* Ignore */ } } } } } if (mandatoryok) { Connection conn = null; SFTPv3Client client = null; boolean good = true; int nbfilestoput = 0; int nbput = 0; int nbrerror = 0; try { // Create a connection instance conn = getConnection( realServerName, realServerPort, realProxyHost, realProxyPort, realproxyUserName, realProxyPassword); if (timeout > 0) { // Use timeout // Cache Host Key if (cachehostkey) { conn.connect(new SimpleVerifier(database), 0, timeout * 1000); } else { conn.connect(null, 0, timeout * 1000); } } else { // Cache Host Key if (cachehostkey) { conn.connect(new SimpleVerifier(database)); } else { conn.connect(); } } // Authenticate boolean isAuthenticated = false; if (publicpublickey) { String keyContent = KettleVFS.getTextFileContent(realKeyFilename, this, Const.XML_ENCODING); isAuthenticated = conn.authenticateWithPublicKey( realUserName, keyContent.toCharArray(), relKeyFilepass); } else { isAuthenticated = conn.authenticateWithPassword(realUserName, realServerPassword); } // LET'S CHECK AUTHENTICATION ... if (isAuthenticated == false) { logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.AuthenticationFailed")); } else { if (log.isBasic()) { logBasic( BaseMessages.getString(PKG, "JobSSH2PUT.Log.Connected", serverName, userName)); } client = new SFTPv3Client(conn); if (log.isDetailed()) { logDetailed( BaseMessages.getString( PKG, "JobSSH2PUT.Log.ProtocolVersion", "" + client.getProtocolVersion())); } // Check if remote directory exists if (!Const.isEmpty(realftpDirectory)) { if (!sshDirectoryExists(client, realftpDirectory)) { good = false; if (createRemoteFolder) { good = CreateRemoteFolder(client, realftpDirectory); if (good) { logBasic(BaseMessages.getString(PKG, "JobSSH2PUT.Log.RemoteDirectoryCreated")); } } else { logError( BaseMessages.getString( PKG, "JobSSH2PUT.Log.RemoteDirectoryNotExist", realftpDirectory)); } } else if (log.isDetailed()) { logDetailed( BaseMessages.getString( PKG, "JobSSH2PUT.Log.RemoteDirectoryExist", realftpDirectory)); } } if (good) { // Get files list from local folder (source) List<FileObject> myFileList = getFiles(realLocalDirectory); // Prepare Pattern for wildcard Pattern pattern = null; if (!Const.isEmpty(realwildcard)) { pattern = Pattern.compile(realwildcard); } // Let's put files now ... // Get the files in the list for (int i = 0; i < myFileList.size() && !parentJob.isStopped(); i++) { FileObject myFile = myFileList.get(i); String localFilename = myFile.toString(); String remoteFilename = myFile.getName().getBaseName(); boolean getIt = true; // First see if the file matches the regular expression! if (pattern != null) { Matcher matcher = pattern.matcher(remoteFilename); getIt = matcher.matches(); } // do we have a target directory? if (!Const.isEmpty(realftpDirectory)) { remoteFilename = realftpDirectory + FTPUtils.FILE_SEPARATOR + remoteFilename; } if (onlyGettingNewFiles) { // We get only new files // ie not exist on the remote server getIt = !sshFileExists(client, remoteFilename); } if (getIt) { nbfilestoput++; boolean putok = putFile(myFile, remoteFilename, client); if (!putok) { nbrerror++; logError( BaseMessages.getString( PKG, "JobSSH2PUT.Log.Error.CanNotPutFile", localFilename)); } else { nbput++; } if (putok && !afterFtpPut.equals("do_nothing")) { deleteOrMoveFiles(myFile, realDestinationFolder); } } } /** ****************************** RESULT ******************* */ if (log.isDetailed()) { logDetailed(BaseMessages.getString(PKG, "JobSSH2PUT.Log.Result.JobEntryEnd1")); logDetailed( BaseMessages.getString( PKG, "JobSSH2PUT.Log.Result.TotalFiles", "" + nbfilestoput)); logDetailed( BaseMessages.getString(PKG, "JobSSH2PUT.Log.Result.TotalFilesPut", "" + nbput)); logDetailed( BaseMessages.getString( PKG, "JobSSH2PUT.Log.Result.TotalFilesError", "" + nbrerror)); logDetailed(BaseMessages.getString(PKG, "JobSSH2PUT.Log.Result.JobEntryEnd2")); } if (nbrerror == 0) { result.setResult(true); /** ****************************** RESULT ******************* */ } } } } catch (Exception e) { result.setNrErrors(nbrerror); logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.Error.ErrorFTP", e.getMessage())); } finally { if (conn != null) { conn.close(); } if (client != null) { client.close(); } } } } catch (Exception e) { result.setResult(false); result.setNrErrors(1L); logError(BaseMessages.getString(PKG, "JobSSH2PUT.Log.Error.UnexpectedError"), e); } return result; }
/** * Authenticate using some supported methods. If authentication fails, the method throws {@link * IOException}. * * @param c the connection to use for authentication * @throws IOException in case of IO error or authentication failure */ private void authenticate(final Connection c) throws IOException { for (String method : myHost.getPreferredMethods()) { if (c.isAuthenticationComplete()) { return; } if (PUBLIC_KEY_METHOD.equals(method)) { if (!myHost.supportsPubkeyAuthentication()) { continue; } if (!c.isAuthMethodAvailable(myHost.getUser(), PUBLIC_KEY_METHOD)) { continue; } File key = myHost.getIdentityFile(); if (key == null) { for (String a : myHost.getHostKeyAlgorithms()) { if (SSH_RSA_ALGORITHM.equals(a)) { if (tryPublicKey(c, idRSAPath)) { return; } } else if (SSH_DSS_ALGORITHM.equals(a)) { if (tryPublicKey(c, idDSAPath)) { return; } } } } else { if (tryPublicKey(c, key.getPath())) { return; } } } else if (KEYBOARD_INTERACTIVE_METHOD.equals(method)) { if (!c.isAuthMethodAvailable(myHost.getUser(), KEYBOARD_INTERACTIVE_METHOD)) { continue; } InteractiveSupport interactiveSupport = new InteractiveSupport(); for (int i = myHost.getNumberOfPasswordPrompts(); i > 0; i--) { if (c.isAuthenticationComplete()) { return; } if (c.authenticateWithKeyboardInteractive(myHost.getUser(), interactiveSupport)) { myLastError = ""; return; } else { myLastError = GitBundle.getString("sshmain.keyboard.interactive.failed"); } if (interactiveSupport.myPromptCount == 0 || interactiveSupport.myCancelled) { // the interactive callback has never been asked or it was cancelled, exit the loop myLastError = ""; break; } } } else if (PASSWORD_METHOD.equals(method)) { if (!myHost.supportsPasswordAuthentication()) { continue; } if (!c.isAuthMethodAvailable(myHost.getUser(), PASSWORD_METHOD)) { continue; } for (int i = myHost.getNumberOfPasswordPrompts(); i > 0; i--) { String password = myXmlRpcClient.askPassword(myHandlerNo, getUserHostString(), myLastError); if (password == null) { break; } else { if (c.authenticateWithPassword(myHost.getUser(), password)) { myLastError = ""; return; } else { myLastError = GitBundle.getString("sshmain.password.failed"); } } } } } throw new IOException("Authentication failed"); }
public Result execute(Result previousResult, int nr) { Result result = previousResult; result.setResult(false); if (log.isRowLevel()) { logRowlevel(BaseMessages.getString(PKG, "JobSSH2GET.Log.GettingFieldsValue")); } // Get real variable value String realServerName = environmentSubstitute(serverName); int realServerPort = Const.toInt(environmentSubstitute(serverPort), 22); String realUserName = environmentSubstitute(userName); String realServerPassword = Encr.decryptPasswordOptionallyEncrypted(environmentSubstitute(password)); // Proxy Host String realProxyHost = environmentSubstitute(httpProxyHost); int realProxyPort = Const.toInt(environmentSubstitute(httpproxyport), 22); String realproxyUserName = environmentSubstitute(httpproxyusername); String realProxyPassword = Encr.decryptPasswordOptionallyEncrypted(environmentSubstitute(httpProxyPassword)); // Key file String realKeyFilename = environmentSubstitute(keyFilename); String relKeyFilepass = environmentSubstitute(keyFilePass); // target files String realLocalDirectory = environmentSubstitute(localDirectory); String realwildcard = environmentSubstitute(wildcard); // Remote source String realftpDirectory = environmentSubstitute(ftpDirectory); // Destination folder (Move to) String realDestinationFolder = environmentSubstitute(destinationfolder); try { // Remote source realftpDirectory = FTPUtils.normalizePath(realftpDirectory); // Destination folder (Move to) realDestinationFolder = FTPUtils.normalizePath(realDestinationFolder); } catch (Exception e) { logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.CanNotNormalizePath", e.getMessage())); result.setNrErrors(1); return result; } // Check for mandatory fields if (log.isRowLevel()) { logRowlevel(BaseMessages.getString(PKG, "JobSSH2GET.Log.CheckingMandatoryFields")); } boolean mandatoryok = true; if (Const.isEmpty(realServerName)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.ServernameMissing")); } if (usehttpproxy) { if (Const.isEmpty(realProxyHost)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.HttpProxyhostMissing")); } } if (publicpublickey) { if (Const.isEmpty(realKeyFilename)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.KeyFileMissing")); } else { // Let's check if key file exists... if (!new File(realKeyFilename).exists()) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.KeyFileNotExist")); } } } if (Const.isEmpty(realLocalDirectory)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.LocalFolderMissing")); } else { // Check if target folder exists... if (!new File(realLocalDirectory).exists()) { if (createtargetfolder) { // Create Target folder if (!CreateFolder(realLocalDirectory)) { mandatoryok = false; } } else { mandatoryok = false; logError( BaseMessages.getString( PKG, "JobSSH2GET.Log.LocalFolderNotExists", realLocalDirectory)); } } else { if (!new File(realLocalDirectory).isDirectory()) { mandatoryok = false; logError( BaseMessages.getString( PKG, "JobSSH2GET.Log.LocalFolderNotFolder", realLocalDirectory)); } } } if (afterFtpPut.equals("move_file")) { if (Const.isEmpty(realDestinationFolder)) { mandatoryok = false; logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.DestinatFolderMissing")); } } if (mandatoryok) { Connection conn = null; SFTPv3Client client = null; boolean good = true; try { // Create a connection instance conn = getConnection( realServerName, realServerPort, realProxyHost, realProxyPort, realproxyUserName, realProxyPassword); if (log.isDetailed()) { logDetailed(BaseMessages.getString(PKG, "JobSSH2GET.Log.ConnectionInstanceCreated")); } if (timeout > 0) { // Use timeout // Cache Host Key if (cachehostkey) { conn.connect(new SimpleVerifier(database), 0, timeout * 1000); } else { conn.connect(null, 0, timeout * 1000); } } else { // Cache Host Key if (cachehostkey) { conn.connect(new SimpleVerifier(database)); } else { conn.connect(); } } // Authenticate boolean isAuthenticated = false; if (publicpublickey) { isAuthenticated = conn.authenticateWithPublicKey( realUserName, new File(realKeyFilename), relKeyFilepass); } else { isAuthenticated = conn.authenticateWithPassword(realUserName, realServerPassword); } // LET'S CHECK AUTHENTICATION ... if (isAuthenticated == false) { logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.AuthenticationFailed")); } else { if (log.isBasic()) { logBasic(BaseMessages.getString(PKG, "JobSSH2GET.Log.Connected", serverName, userName)); } client = new SFTPv3Client(conn); if (log.isDetailed()) { logDetailed( BaseMessages.getString( PKG, "JobSSH2GET.Log.ProtocolVersion", "" + client.getProtocolVersion())); } // Check if ftp (source) directory exists if (!Const.isEmpty(realftpDirectory)) { if (!sshDirectoryExists(client, realftpDirectory)) { good = false; logError( BaseMessages.getString( PKG, "JobSSH2GET.Log.RemoteDirectoryNotExist", realftpDirectory)); } else if (log.isDetailed()) { logDetailed( BaseMessages.getString( PKG, "JobSSH2GET.Log.RemoteDirectoryExist", realftpDirectory)); } } if (realDestinationFolder != null) { // Check now destination folder if (!sshDirectoryExists(client, realDestinationFolder)) { if (createdestinationfolder) { if (!CreateRemoteFolder(client, realDestinationFolder)) { good = false; } } else { good = false; logError( BaseMessages.getString( PKG, "JobSSH2GET.Log.DestinatFolderNotExist", realDestinationFolder)); } } } if (good) { Pattern pattern = null; if (!Const.isEmpty(realwildcard)) { pattern = Pattern.compile(realwildcard); } if (includeSubFolders) { if (log.isDetailed()) { logDetailed(BaseMessages.getString(PKG, "JobSSH2GET.Log.RecursiveModeOn")); } copyRecursive(realftpDirectory, realLocalDirectory, client, pattern, parentJob); } else { if (log.isDetailed()) { logDetailed(BaseMessages.getString(PKG, "JobSSH2GET.Log.RecursiveModeOff")); } GetFiles(realftpDirectory, realLocalDirectory, client, pattern, parentJob); } /** ****************************** RESULT ******************* */ if (log.isDetailed()) { logDetailed(BaseMessages.getString(PKG, "JobSSH2GET.Log.Result.JobEntryEnd1")); logDetailed( BaseMessages.getString( PKG, "JobSSH2GET.Log.Result.TotalFiles", "" + nbfilestoget)); logDetailed( BaseMessages.getString(PKG, "JobSSH2GET.Log.Result.TotalFilesPut", "" + nbgot)); logDetailed( BaseMessages.getString( PKG, "JobSSH2GET.Log.Result.TotalFilesError", "" + nbrerror)); logDetailed(BaseMessages.getString(PKG, "JobSSH2GET.Log.Result.JobEntryEnd2")); } if (nbrerror == 0) { result.setResult(true); /** ****************************** RESULT ******************* */ } } } } catch (Exception e) { result.setNrErrors(nbrerror); logError(BaseMessages.getString(PKG, "JobSSH2GET.Log.Error.ErrorFTP", e.getMessage())); } finally { if (conn != null) { conn.close(); } if (client != null) { client.close(); } } } return result; }
public static void main(String[] args) { String hostname = "127.0.0.1"; String username = "******"; String password = "******"; try { /* Create a connection instance */ Connection conn = new Connection(hostname); /* Now connect */ conn.connect(); /* Authenticate */ boolean isAuthenticated = conn.authenticateWithPassword(username, password); if (isAuthenticated == false) throw new IOException("Authentication failed."); /* Create a session */ Session sess = conn.openSession(); sess.execCommand("echo \"Text on STDOUT\"; echo \"Text on STDERR\" >&2"); InputStream stdout = new StreamGobbler(sess.getStdout()); InputStream stderr = new StreamGobbler(sess.getStderr()); BufferedReader stdoutReader = new BufferedReader(new InputStreamReader(stdout)); BufferedReader stderrReader = new BufferedReader(new InputStreamReader(stderr)); System.out.println("Here is the output from stdout:"); while (true) { String line = stdoutReader.readLine(); if (line == null) break; System.out.println(line); } System.out.println("Here is the output from stderr:"); while (true) { String line = stderrReader.readLine(); if (line == null) break; System.out.println(line); } /* Close this session */ sess.close(); /* Close the connection */ conn.close(); } catch (IOException e) { e.printStackTrace(System.err); System.exit(2); } }