Re: [JSch-users] Welcome to the "JSch-users" mailing list

[Heiner W. <Heiner.Westphal@Heiner-Westphal.de>]

Hello!

If this happens after some time of inactivity, setting keep-alive should help.
Some firewalls, like checkpoint, drop inactive connections after some idle time.

(Got no jsch at hands to look for the exact syntax, but I believe something like 
channel.setKeepAlive(true);
should do - maybe it's the session though).

If it happens on an active connection, I have no Idea, but the stack trace could
shed some more light.

Regards,

Heiner

Professor Flávio Brito wrote:
> 
>     Hi
> 
>     Congratulations for your work with jcraft.scp library. We are using
>     your jcraft library. After 2 months with success sending files to
>     our server, we are receiving a message "java.io.IOException: broken
>     channel".
>     We cleaned our firewall without success, but when we try it outside
>     our network it's OK. Can you help us?
> 
>     Thanks
> 
>     Flávio Brito
>     Rio de Janeiro - Brazil
> 
>     Our code
>     /*
>      * ScpToFtp.java
>      *
>      * Created on 19 de Abril de 2007, 14:46
>      *
>      * To change this template, choose Tools | Template Manager
>      * and open the template in the editor.
>      */
> 
>     package utils;
> 
>     import com.jcraft.jsch.*;
>     import java.awt.Container;
>     import java.awt.GridBagConstraints;
>     import java.awt.GridBagLayout;
>     import java.awt.Insets;
>     import java.io.File;
>     import java.io.FileInputStream;
>     import java.io.IOException;
>     import java.io.InputStream;
>     import java.io.OutputStream;
>     import javax.swing.JLabel;
>     import javax.swing.JOptionPane;
>     import javax.swing.JPanel;
>     import javax.swing.JPasswordField;
>     import javax.swing.JTextField;
> 
> 
>     /**
>      *
>      * @author renan
>      */
>     public class ScpToFtp {
>         String senha=null;
>        
>        
>         /** Creates a new instance of ScpToFtp */
>         public ScpToFtp(String fileNome,String usuario, String
>     passwd,String hostSsh,String portaSsh ,String fileNome2) throws
>     JSchException, IOException  {
>            
>            
>             FileInputStream fis=null;
> 
>                
>                 String lfile=fileNome;
>                 String user=usuario;
>                 senha = passwd;
>                 String host=hostSsh;
>                 String rfile=fileNome2;
>                
>                 JSch jsch=new JSch();
>                 Session session=jsch.getSession(user, host, 8155);
>                
>                 // 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();
>                
>                
>                 // send "C0644 filesize filename", where filename should
>     not include '/'
>                 long filesize=(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();
>                
>                 // send a content of lfile - manadan o arquivo
>                 fis=new FileInputStream(lfile);
>                
>                 byte[] buf=new byte[1024];
>                 int nLidos;
>                 while((nLidos = fis.read(buf))>=0){
>                     out.write(buf,0,nLidos);
>                 }
>                
>            /* while(true){
>                 int len=fis.read(buf, 0, buf.length);
>                 if(len<=0) break;
>                 out.write(buf, 0, len); //out.flush();
>            
>             }*/
>                 fis.close();
>                 fis=null;
>                 // send '\0'
>                 buf[0]=0;
>                 out.write(buf, 0, 1);
>                 out.flush();
>                 out.close();
>                 channel.disconnect();
>                 session.disconnect();
>          
>                
>                if(fis!=null)
>                     fis.close();
>                
>            
>         }
>        
>         static int checkAck(InputStream in) throws Exception{
>             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 class MyUserInfo implements UserInfo,  UIKeyboardInteractive{
>            
>             public String getPassphrase() {
>                 return null;
>             }
>            
>             public String getPassword() {
>                 return senha;
>             }
>            
>             public boolean promptPassword(String string) {
>                 return true;
>             }
>            
>             public boolean promptPassphrase(String string) {
>                 return true;
>             }
>            
>             public boolean promptYesNo(String string) {
>                 return true;
>             }
>            
>             public void showMessage(String string) {
>             }
>            
>             public String[] promptKeyboardInteractive(String string,
>     String string0, String string1, String[] prompt, boolean[] b) {
>                 String[] response=new String[prompt.length];
>                 for(int i=0; i<prompt.length; i++){
>                     response[i]=senha;
>                 }
>                 return response;
> 
>             }
>            
>         }
>        
>     }
> 
> 
> 
> 
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