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Thread: ssh server throwing exception

  1. #1
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    Default ssh server throwing exception

    hi im writing an ssh server and client im using apache mina as the ssh deamon and jsch for the client
    but am getting a NumberFormatException on the server i think when transmitting the time from client to server but cant find the problem
    server code:
      public static void setupSftpServer(){
            SshServer sshd = SshServer.setUpDefaultServer();
            sshd.setPort(2228);
            sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider("hostkey.ser"));
     
            List<NamedFactory<UserAuth>> userAuthFactories = new ArrayList<NamedFactory<UserAuth>>();
            userAuthFactories.add(new UserAuthNone.Factory());
            sshd.setUserAuthFactories(userAuthFactories);
     
            sshd.setCommandFactory(new ScpCommandFactory());
     
            List<NamedFactory<Command>> namedFactoryList = new ArrayList<NamedFactory<Command>>();
            namedFactoryList.add(new SftpSubsystem.Factory());
            sshd.setSubsystemFactories(namedFactoryList);
     
            try {
                sshd.start();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    the client code
        public static void tfc(String[] arg){//args==>file1 user@remotehost:file2
     
            if(arg.length!=2){
                System.err.println("usage: java ScpTo file1 user@remotehost:file2");
                System.exit(-1);
            }
     
            FileInputStream fis=null;
            try{
     
                String lfile=arg[0];
                //System.out.println(lfile);
                String user=arg[1].substring(0, arg[1].indexOf('@'));
                //System.out.println(user);
                arg[1]=arg[1].substring(arg[1].indexOf('@')+1);
                String host=arg[1].substring(0, arg[1].indexOf(':'));
                // System.out.println(host);
                String rfile=arg[1].substring(arg[1].indexOf(':')+1);
                // System.out.println(rfile);
     
                JSch jsch1=new JSch();
                Session session;
     
                session = jsch1.getSession(user, host, 22);
                System.out.println(user+"  "+host);
     
                // username and password will be given via UserInfo interface.
                UserInfo ui=new KnownHosts.MyUserInfo();
                session.setUserInfo(ui);
                //set up aes
    //session.setConfig("cipher.s2c", "aes128-cbc,3des-cbc,blowfish-cbc");
    //session.setConfig("cipher.c2s", "aes128-cbc,3des-cbc,blowfish-cbc");
    //session.setConfig("CheckCiphers", "aes128-cbc");
    //done setting aes
                System.out.println("aaa");
                session.connect();//error here
                System.out.println("bbb");
                boolean ptimestamp = true;
     
                // exec 'scp -t rfile' remotely
                String command="scp " + (ptimestamp ? "-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();
     
                if(checkAck(in)!=0){
                    System.exit(0);
                }
     
                File _lfile = new File(lfile);
     
                if(ptimestamp){
                    command="T "+(_lfile.lastModified()/1000)+" 0";
                    // The access time should be sent here,
                    // but it is not accessible with JavaAPI ;-<
                    command+=(" "+(_lfile.lastModified()/1000)+" 0\n");
                    out.write(command.getBytes()); out.flush();
                    if(checkAck(in)!=0){
                        System.exit(0);
                    }
                }
     
                // send "C0644 filesize filename", where filename should not include '/'
                long filesize=_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
                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();
                }
                fis.close();
                fis=null;
                // send '\0'
                buf[0]=0; out.write(buf, 0, 1); out.flush();
                if(checkAck(in)!=0){
                    System.exit(0);
                }
                out.close();
     
                channel.disconnect();
                session.disconnect();
     
                System.exit(0);
            }catch(JSchException ex1){
                ex1.printStackTrace();
                   try{if(fis!=null){
                    fis.close();
                }
                }catch(Exception ee){
                    System.out.println("ft error");
                }
            } catch (IOException ex) {
                java.util.logging.Logger.getLogger(ScpTo.class.getName()).log(Level.SEVERE, null, ex);
                   try{if(fis!=null){
                    fis.close();
                }
                }catch(Exception ee){
                    System.out.println("ft error");
                }
            }
     
     
        }//end main
     
        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());
                }
            }else if(b==0){
                System.out.println("file sent");
            }
            return b;
        }//end checkack
     
    }//end class
    the error from server (the client throws no errors)
    Exception in thread "ScpCommand: scp -p -t /home/user/k" java.lang.NumberFormatException: For input string: ""
    	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    	at java.lang.Long.parseLong(Long.java:601)
    	at java.lang.Long.parseLong(Long.java:631)
    	at org.apache.sshd.common.scp.ScpHelper.parseTime(ScpHelper.java:420)
    	at org.apache.sshd.common.scp.ScpHelper.receive(ScpHelper.java:98)
    	at org.apache.sshd.server.command.ScpCommand.run(ScpCommand.java:140)
    	at java.lang.Thread.run(Thread.java:745)
    when i change port of client to 22 it sends it to my open ssh server and works fine but when i send it to apache mina i get this error anyone have any idea where its going wrong thanks


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: ssh server throwing exception

    java.lang.NumberFormatException: For input string: ""
    ...
    at org.apache.sshd.common.scp.ScpHelper.parseTime(Scp Helper.java:420)
    At line 420 in ScpHelper the code calls parseLong with an empty String.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: ssh server throwing exception

    k but on in this part of code i am sending false data with T so why is it null on server?
    if(ptimestamp){
                    command="T "+(_lfile.lastModified()/1000)+" 0";
                    // The access time should be sent here,
                    // but it is not accessible with JavaAPI ;-<
                    command+=(" "+(_lfile.lastModified()/1000)+" 0\n");
                    out.write(command.getBytes()); out.flush();
                    if(checkAck(in)!=0){
                        System.exit(0);
                    }
                }
    here is switch statement on server side it doesint seems possible to try catch and input false data there
     long[] time = null;
            for (;;)
            {
                String line;
                boolean isDir = false;
                int c = readAck(true);
                switch (c)
                {
                    case -1:
                        return;
                    case 'D':
                        isDir = true;
                    case 'C':
                        line = ((char) c) + readLine();
                        log.debug("Received header: " + line);
                        break;
                    case 'T':
                        line = ((char) c) + readLine();
                        log.debug("Received header: " + line);
                        time = parseTime(line);
                        ack();
                        continue;
                    case 'E':
                        line = ((char) c) + readLine();
                        log.debug("Received header: " + line);
                        ack();
                        return;
                    default:
                        //a real ack that has been acted upon already
                        continue;
                }
    any ideas apart from edit source of librarys as i would probobly break em
    also why does it work with open ssh

    --- Update ---

    k have working should be no space after Tswitch and time should be seperated with spaces not : well that only took about 10 hours lol so in case others have same problem
    Calendar cal = Calendar.getInstance();
                cal.getTime();
                SimpleDateFormat sdf = new SimpleDateFormat("HH mm ss");
                String time= sdf.format(cal.getTime());
     
                if(ptimestamp){
                    command="T"+time;//(_lfile.lastModified()/1000)+" 0";
                    command+=(" "+(_lfile.lastModified()/1000)+" 0\n");               
                    out.write(command.getBytes());              
                    out.flush();
                    if(checkAck(in)!=0){
                        System.exit(0);
                    }
                }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: ssh server throwing exception

    Thanks for sharing.
    If you don't understand my answer, don't ignore it, ask a question.

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