Ant example source code file (SSHBase.java)

This example Ant source code file (SSHBase.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Ant tags/keywords

buildexception, jsch, loglistener, session, ssh_port, ssh_port, sshbase, sshbase, sshuserinfo, sshuserinfo, string, string, task, using

The SSHBase.java source code

/*
 *  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.tools.ant.taskdefs.optional.ssh;

import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.JSch;

import org.apache.tools.ant.Task;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;

/**
 * Base class for Ant tasks using jsch.
 *
 * @since Ant 1.6
 */
public abstract class SSHBase extends Task implements LogListener {

    /** Default listen port for SSH daemon */
    private static final int SSH_PORT = 22;

    private String host;
    private String knownHosts;
    private int port = SSH_PORT;
    private boolean failOnError = true;
    private boolean verbose;
    private SSHUserInfo userInfo;

    /**
     * Constructor for SSHBase.
     */
    public SSHBase() {
        super();
        userInfo = new SSHUserInfo();
    }

    /**
     * Remote host, either DNS name or IP.
     *
     * @param host  The new host value
     */
    public void setHost(String host) {
        this.host = host;
    }

    /**
     * Get the host.
     * @return the host
     */
    public String getHost() {
        return host;
    }

    /**
     * Set the failonerror flag.
     * Default is true
     * @param failure if true throw a build exception when a failure occuries,
     *                otherwise just log the failure and continue
     */
    public void setFailonerror(boolean failure) {
        failOnError = failure;
    }

    /**
     * Get the failonerror flag.
     * @return the failonerror flag
     */
    public boolean getFailonerror() {
        return failOnError;
    }

    /**
     * Set the verbose flag.
     * @param verbose if true output more verbose logging
     * @since Ant 1.6.2
     */
    public void setVerbose(boolean verbose) {
        this.verbose = verbose;
    }

    /**
     * Get the verbose flag.
     * @return the verbose flag
     * @since Ant 1.6.2
     */
    public boolean getVerbose() {
        return verbose;
    }

    /**
     * Username known to remote host.
     *
     * @param username  The new username value
     */
    public void setUsername(String username) {
        userInfo.setName(username);
    }


    /**
     * Sets the password for the user.
     *
     * @param password  The new password value
     */
    public void setPassword(String password) {
        userInfo.setPassword(password);
    }

    /**
     * Sets the keyfile for the user.
     *
     * @param keyfile  The new keyfile value
     */
    public void setKeyfile(String keyfile) {
        userInfo.setKeyfile(keyfile);
    }

    /**
     * Sets the passphrase for the users key.
     *
     * @param passphrase  The new passphrase value
     */
    public void setPassphrase(String passphrase) {
        userInfo.setPassphrase(passphrase);
    }

    /**
     * Sets the path to the file that has the identities of
     * all known hosts.  This is used by SSH protocol to validate
     * the identity of the host.  The default is
     * <i>${user.home}/.ssh/known_hosts.
     *
     * @param knownHosts a path to the known hosts file.
     */
    public void setKnownhosts(String knownHosts) {
        this.knownHosts = knownHosts;
    }

    /**
     * Setting this to true trusts hosts whose identity is unknown.
     *
     * @param yesOrNo if true trust the identity of unknown hosts.
     */
    public void setTrust(boolean yesOrNo) {
        userInfo.setTrust(yesOrNo);
    }

    /**
     * Changes the port used to connect to the remote host.
     *
     * @param port port number of remote host.
     */
    public void setPort(int port) {
        this.port = port;
    }

    /**
     * Get the port attribute.
     * @return the port
     */
    public int getPort() {
        return port;
    }

    /**
     * Initialize the task.
     * This initializizs the known hosts and sets the default port.
     * @throws BuildException on error
     */
    public void init() throws BuildException {
        super.init();
        this.knownHosts = System.getProperty("user.home") + "/.ssh/known_hosts";
        this.port = SSH_PORT;
    }

    /**
     * Open an ssh seession.
     * @return the opened session
     * @throws JSchException on error
     */
    protected Session openSession() throws JSchException {
        JSch jsch = new JSch();
        if (null != userInfo.getKeyfile()) {
            jsch.addIdentity(userInfo.getKeyfile());
        }

        if (!userInfo.getTrust() && knownHosts != null) {
            log("Using known hosts: " + knownHosts, Project.MSG_DEBUG);
            jsch.setKnownHosts(knownHosts);
        }

        Session session = jsch.getSession(userInfo.getName(), host, port);
        session.setUserInfo(userInfo);
        log("Connecting to " + host + ":" + port);
        session.connect();
        return session;
    }

    /**
     * Get the user information.
     * @return the user information
     */
    protected SSHUserInfo getUserInfo() {
        return userInfo;
    }
}