X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=cms%2Forg.argeo.slc.support%2Fsrc%2Forg%2Fargeo%2Fslc%2Fjsch%2FAbstractJschTask.java;fp=cms%2Forg.argeo.slc.support%2Fsrc%2Forg%2Fargeo%2Fslc%2Fjsch%2FAbstractJschTask.java;h=59c0acfae4866f12e953efc523aedc88e5b22785;hb=ecc22e604e47533c79de9cecdcdeacbc752cbff1;hp=0000000000000000000000000000000000000000;hpb=e07ded4632e53f8b8869763bc1f1f4091361e76e;p=gpl%2Fargeo-slc.git

diff --git a/cms/org.argeo.slc.support/src/org/argeo/slc/jsch/AbstractJschTask.java b/cms/org.argeo.slc.support/src/org/argeo/slc/jsch/AbstractJschTask.java
new file mode 100644
index 000000000..59c0acfae
--- /dev/null
+++ b/cms/org.argeo.slc.support/src/org/argeo/slc/jsch/AbstractJschTask.java
@@ -0,0 +1,140 @@
+package org.argeo.slc.jsch;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.PrivilegedAction;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.SlcException;
+
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.Logger;
+import com.jcraft.jsch.Session;
+import com.jcraft.jsch.UserAuthGSSAPIWithMIC;
+
+public abstract class AbstractJschTask implements Runnable {
+	private final Log log = LogFactory.getLog(getClass());
+
+	private SshTarget sshTarget;
+
+	protected Session openSession() {
+		if (sshTarget.getSession() != null) {
+			Session session = sshTarget.getSession();
+			if (session.isConnected()) {
+				if (log.isTraceEnabled())
+					log.debug("Using cached session to " + getSshTarget() + " via SSH");
+				return session;
+			}
+		}
+
+		try {
+			JSch jsch = new JSch();
+			if (sshTarget.getUsePrivateKey() && sshTarget.getLocalPrivateKey().exists())
+				jsch.addIdentity(sshTarget.getLocalPrivateKey().getAbsolutePath());
+			Session session = jsch.getSession(getSshTarget().getUser(), getSshTarget().getHost(),
+					getSshTarget().getPort());
+
+			session.setUserInfo(getSshTarget().getUserInfo());
+			session.setConfig("userauth.gssapi-with-mic", UserAuthGSSAPIWithMIC.class.getName());
+			session.setServerAliveInterval(1000);
+			session.connect();
+			if (log.isTraceEnabled())
+				log.trace("Connected to " + getSshTarget() + " via SSH");
+			if (sshTarget.getSession() != null) {
+				if (log.isTraceEnabled())
+					log.trace("The cached session to " + getSshTarget() + " was disconnected and was reset.");
+				sshTarget.setSession(session);
+			}
+			return session;
+		} catch (JSchException e) {
+			if (sshTarget.getUserInfo() instanceof SimpleUserInfo)
+				((SimpleUserInfo) sshTarget.getUserInfo()).reset();
+			throw new SlcException("Could not open session to " + getSshTarget(), e);
+		}
+	}
+
+	public void run() {
+		Session session = openSession();
+		try {
+			run(session);
+		} finally {
+			if (sshTarget != null && sshTarget.getSession() == null) {
+				session.disconnect();
+				if (log.isTraceEnabled())
+					log.trace("Disconnected from " + getSshTarget() + " via SSH");
+			}
+		}
+	}
+
+	abstract void run(Session session);
+
+	protected int checkAck(InputStream in) throws IOException {
+		int b = in.read();
+		// b may be 0 for success,
+		// 1 for error,
+		// 2 for fatal error,
+		// -1
+		if (b == 0)
+			return b;
+		else if (b == -1)
+			return b;// throw new SlcException("SSH ack returned -1");
+		else if (b == 1 || b == 2) {
+			StringBuffer sb = new StringBuffer();
+			int c;
+			do {
+				c = in.read();
+				sb.append((char) c);
+			} while (c != '\n');
+			if (b == 1) { // error
+				throw new SlcException("SSH ack error: " + sb.toString());
+			}
+			if (b == 2) { // fatal error
+				throw new SlcException("SSH fatal error: " + sb.toString());
+			}
+		}
+		return b;
+	}
+
+	public SshTarget getSshTarget() {
+		if (sshTarget == null)
+			throw new SlcException("No SSH target defined.");
+		return sshTarget;
+	}
+
+	public void setSshTarget(SshTarget sshTarget) {
+		this.sshTarget = sshTarget;
+	}
+
+	PrivilegedAction<Void> asPrivilegedAction() {
+		return new PrivilegedAction<Void>() {
+			public Void run() {
+				AbstractJschTask.this.run();
+				return null;
+			}
+		};
+	}
+
+	static {
+		JSch.setLogger(new JschLogger());
+	}
+
+	private static class JschLogger implements Logger {
+		private final Log log = LogFactory.getLog(JschLogger.class);
+
+		// TODO better support levels
+		@Override
+		public boolean isEnabled(int level) {
+			if (log.isTraceEnabled())
+				return true;
+			return false;
+		}
+
+		@Override
+		public void log(int level, String message) {
+			log.trace(message);
+		}
+
+	}
+}