/**
* Determines whether a vaild session exists for the contact of remote machine.
*
* @param sshContact ID of SSH Contact
* @return <tt>true</tt> if the session is connected <tt>false</tt> otherwise
*/
public boolean isSessionValid(ContactSSH sshContact) {
Session sshSession = sshContact.getSSHSession();
if (sshSession != null) if (sshSession.isConnected()) return true;
// remove reference to an unconnected SSH Session, if any
sshContact.setSSHSession(null);
return false;
}
/**
* Creates a channel for shell type in the current session channel types = shell, sftp, exec(X
* forwarding), direct-tcpip(stream forwarding) etc
*
* @param sshContact ID of SSH Contact
*/
public void createShellChannel(ContactSSH sshContact) throws IOException {
try {
Channel shellChannel = sshContact.getSSHSession().openChannel("shell");
// initalizing the reader and writers of ssh contact
sshContact.initializeShellIO(shellChannel.getInputStream(), shellChannel.getOutputStream());
((ChannelShell) shellChannel)
.setPtyType(sshContact.getSSHConfigurationForm().getTerminalType());
// initializing the shell
shellChannel.connect(1000);
sshContact.setShellChannel(shellChannel);
sshContact.sendLine("export PS1=");
} catch (JSchException ex) {
sshContact.setSSHSession(null);
throw new IOException("Unable to create shell channel to remote" + " server");
}
}
/**
* Closes the SSH Session associated with the contact
*
* @param sshContact ID of SSH Contact
*/
void closeSSHSession(ContactSSH sshContact) {
sshContact.getSSHSession().disconnect();
sshContact.setSSHSession(null);
}