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ScpTo.java

/* -*-mode:java; c-basic-offset:2; -*- */
import com.jcraft.jsch.*;

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ScpTo{
  public static void main(String[] arg){
    if(arg.length!=2){
      System.err.println("usage: java ScpTo file1 user@remotehost:file2");
      System.exit(-1);
    }      

    try{

      String lfile=arg[0];
      String user=arg[1].substring(0, arg[1].indexOf('@'));
      arg[1]=arg[1].substring(arg[1].indexOf('@')+1);
      String host=arg[1].substring(0, arg[1].indexOf(':'));
      String rfile=arg[1].substring(arg[1].indexOf(':')+1);

      JSch jsch=new JSch();
      Session session=jsch.getSession(user, host, 22);

      // username and password will be given via UserInfo interface.
      UserInfo ui=new MyUserInfo();
      session.setUserInfo(ui);
      session.connect();


      // exec 'scp -t rfile' remotely
      String command="scp -p -t "+rfile;
      Channel channel=session.openChannel("exec");
      ((ChannelExec)channel).setCommand(command);

      // get I/O streams for remote scp
      OutputStream out=channel.getOutputStream();
      InputStream in=channel.getInputStream();

      channel.connect();

      byte[] tmp=new byte[1];

      if(checkAck(in)!=0){
      System.exit(0);
      }

      // send "C0644 filesize filename", where filename should not include '/'
      int filesize=(int)(new File(lfile)).length();
      command="C0644 "+filesize+" ";
      if(lfile.lastIndexOf('/')>0){
        command+=lfile.substring(lfile.lastIndexOf('/')+1);
      }
      else{
        command+=lfile;
      }
      command+="\n";
      out.write(command.getBytes()); out.flush();

      if(checkAck(in)!=0){
      System.exit(0);
      }

      // send a content of lfile
      FileInputStream fis=new FileInputStream(lfile);
      byte[] buf=new byte[1024];
      while(true){
        int len=fis.read(buf, 0, buf.length);
      if(len<=0) break;
        out.write(buf, 0, len); out.flush();
      }

      // send '\0'
      buf[0]=0; out.write(buf, 0, 1); out.flush();

      if(checkAck(in)!=0){
      System.exit(0);
      }

      System.exit(0);
    }
    catch(Exception e){
      System.out.println(e);
    }
  }

  static 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;
    if(b==-1) return b;

    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
      System.out.print(sb.toString());
      }
      if(b==2){ // fatal error
      System.out.print(sb.toString());
      }
    }
    return b;
  }

  public static class MyUserInfo implements UserInfo{
    public String getPassword(){ return passwd; }
    public boolean promptYesNo(String str){
      Object[] options={ "yes", "no" };
      int foo=JOptionPane.showOptionDialog(null, 
             str,
             "Warning", 
             JOptionPane.DEFAULT_OPTION, 
             JOptionPane.WARNING_MESSAGE,
             null, options, options[0]);
       return foo==0;
    }
  
    String passwd;
    JTextField passwordField=(JTextField)new JPasswordField(20);

    public String getPassphrase(){ return null; }
    public boolean promptPassphrase(String message){ return true; }
    public boolean promptPassword(String message){
      Object[] ob={passwordField}; 
      int result=
        JOptionPane.showConfirmDialog(null, ob, message,
                              JOptionPane.OK_CANCEL_OPTION);
      if(result==JOptionPane.OK_OPTION){
      passwd=passwordField.getText();
      return true;
      }
      else{ return false; }
    }
    public void showMessage(String message){
      JOptionPane.showMessageDialog(null, message);
    }
  }

}

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