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package com.whaleal.icefrog.extra.ssh;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
import com.whaleal.icefrog.core.io.IORuntimeException;
import com.whaleal.icefrog.core.io.IoUtil;
import com.whaleal.icefrog.core.util.StrUtil;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;

/**
 * Ganymed-SSH2封装,见:http://www.ganymed.ethz.ch/ssh2/
 *
 * @author Looly
 * @author wh
 * @since 1.0.0
 */
public class GanymedUtil {

	/**
	 * 连接到服务器
	 *
	 * @param sshHost 主机
	 * @param sshPort 端口
	 * @return {@link Connection}
	 */
	public static Connection connect(String sshHost, int sshPort) {
		Connection conn = new Connection(sshHost, sshPort);
		try {
			conn.connect();
		} catch (IOException e) {
			throw new IORuntimeException(e);
		}
		return conn;
	}

	/**
	 * 打开远程会话
	 *
	 * @param sshHost 主机
	 * @param sshPort 端口
	 * @param sshUser 用户名,如果为null,默认root
	 * @param sshPass 密码
	 * @return {@link Session}
	 */
	public static Session openSession(String sshHost, int sshPort, String sshUser, String sshPass) {
		// 默认root用户
		if (StrUtil.isEmpty(sshUser)) {
			sshUser = "root";
		}

		final Connection connect = connect(sshHost, sshPort);
		try {
			connect.authenticateWithPassword(sshUser, sshPass);
			return connect.openSession();
		} catch (IOException e) {
			throw new IORuntimeException(e);
		}
	}

	/**
	 * 执行Shell命令(使用EXEC方式)
	 * 

* 此方法单次发送一个命令到服务端,不读取环境变量,执行结束后自动关闭Session,不会产生阻塞。 *

* * @param session Session会话 * @param cmd 命令 * @param charset 发送和读取内容的编码 * @param errStream 错误信息输出到的位置 * @return 执行返回结果 */ public static String exec(Session session, String cmd, Charset charset, OutputStream errStream) { final String result; try { session.execCommand(cmd, charset.name()); result = IoUtil.read(new StreamGobbler(session.getStdout()), charset); // 错误输出 IoUtil.copy(new StreamGobbler(session.getStdout()), errStream); } catch (IOException e) { throw new IORuntimeException(e); } finally { close(session); } return result; } /** * 执行Shell命令 *

* 此方法单次发送一个命令到服务端,自动读取环境变量,执行结束后自动关闭Session,不会产生阻塞。 *

* * @param session Session会话 * @param cmd 命令 * @param charset 发送和读取内容的编码 * @param errStream 错误信息输出到的位置 * @return 执行返回结果 */ public static String execByShell(Session session, String cmd, Charset charset, OutputStream errStream) { final String result; try { session.requestDumbPTY(); IoUtil.write(session.getStdin(), charset, true, cmd); result = IoUtil.read(new StreamGobbler(session.getStdout()), charset); if(null != errStream){ // 错误输出 IoUtil.copy(new StreamGobbler(session.getStdout()), errStream); } } catch (IOException e) { throw new IORuntimeException(e); } finally { close(session); } return result; } /** * 关闭会话 * * @param session 会话通道 */ public static void close(Session session) { if (session != null) { session.close(); } } }




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