SSL Server Socket and j2me

I make a SSL Server Socket. I want that a cell connect to it for take data. I have to make Certificate form my server. this is for a Stage so I can't pay for certificate. If I make my self signed cert can I install it to a cell or this operation is blocked?

Sorry, I make an SSL Server Socket using java and this server stays on a pc.

Similar Messages

Problems Reading SSL server socket data stream using readByte()

Hi I'm trying to read an SSL server socket stream using readByte(). I need to use readByte() because my program acts an LDAP proxy (receives LDAP messages from an LDAP client then passes them onto an actual LDAP server. It works fine with normal LDAP data streams but once an SSL data stream is introduced, readByte just hangs! Here is my code.....
help!!! anyone?... anyone?
1. SSL Socket is first read into " InputStream input"
public void     run()
          Authorization     auth = new Authorization();
          try     {
               InputStream     input     =     client.getInputStream();
               while     (true)
               {     StandLdapCommand command;
                    try
                         command = new StandLdapCommand(input);
                         Authorization     t = command.get_auth();
                         if (t != null )
                              auth = t;
                    catch( SocketException e )
                    {     // If socket error, drop the connection
                         Message.Info( "Client connection closed: " + e );
                         close( e );
                         break;
                    catch( EOFException e )
                    {     // If socket error, drop the connection
                         Message.Info( "Client connection close: " + e );
                         close( e );
                         break;
                    catch( Exception e )
                         //Way too many of these to trace them!
                         Message.Error( "Command not processed due to exception");
                         close( e );
                                        break;
                                        //continue;
                    processor.processBefore(auth,     command);
                                try
                                  Thread.sleep(40); //yield to other threads
                                catch(InterruptedException ie) {}
          catch     (Exception e)
               close(e);
2 Then data is sent to an intermediate function
from this statement in the function above:   command = new StandLdapCommand(input);
     public StandLdapCommand(InputStream     in)     throws IOException
          message     =     LDAPMessage.receive(in);
          analyze();
Then finally, the read function where it hangs at "int tag = (int)din.readByte(); "
public static LDAPMessage receive(InputStream is) throws IOException
    * LDAP Message Format =
    *      1. LBER_SEQUENCE                           -- 1 byte
    *      2. Length                                  -- variable length     = 3 + 4 + 5 ....
    *      3. ID                                      -- variable length
    *      4. LDAP_REQ_msg                            -- 1 byte
    *      5. Message specific structure              -- variable length
    DataInputStream din = new DataInputStream(is);
    int tag = public static LDAPMessage receive(InputStream is) throws IOException
    * LDAP Message Format =
    *      1. LBER_SEQUENCE                           -- 1 byte
    *      2. Length                                  -- variable length     = 3 + 4 + 5 ....
    *      3. ID                                      -- variable length
    *      4. LDAP_REQ_msg                            -- 1 byte
    *      5. Message specific structure              -- variable length
    DataInputStream din = new DataInputStream(is);
       int tag = (int)din.readByte();      // sequence tag// sequence tag
    ...

I suspect you are actually getting an Exception and not tracing the cause properly and then doing a sleep and then getting another Exception. Never ever catch an exception without tracing what it actually is somewhere.
Also I don't know what the sleep is supposed to be for. You will block in readByte() until something comes in, and that should be enough yielding for anybody. The sleep is just literally a waste of time.

Problem trying to read an SSL server socket stream using readByte().

Hi I'm trying to read an SSL server socket stream using readByte(). I need to use readByte() because my program acts an LDAP proxy (receives LDAP messages from an LDAP client then passes them onto an actual LDAP server. It works fine with normal LDAP data streams but once an SSL data stream is introduced, readByte just hangs! Here is my code.....
help!!! anyone?... anyone?
1. SSL Socket is first read into " InputStream input"
public void     run()
          Authorization     auth = new Authorization();
          try     {
               InputStream     input     =     client.getInputStream();
               while     (true)
               {     StandLdapCommand command;
                    try
                         command = new StandLdapCommand(input);
                         Authorization     t = command.get_auth();
                         if (t != null )
                              auth = t;
                    catch( SocketException e )
                    {     // If socket error, drop the connection
                         Message.Info( "Client connection closed: " + e );
                         close( e );
                         break;
                    catch( EOFException e )
                    {     // If socket error, drop the connection
                         Message.Info( "Client connection close: " + e );
                         close( e );
                         break;
                    catch( Exception e )
                         //Way too many of these to trace them!
                         Message.Error( "Command not processed due to exception");
                         close( e );
                                        break;
                                        //continue;
                    processor.processBefore(auth,     command);
                                try
                                  Thread.sleep(40); //yield to other threads
                                catch(InterruptedException ie) {}
          catch     (Exception e)
               close(e);
2 Then data is sent to an intermediate function
from this statement in the function above:   command = new StandLdapCommand(input);
     public StandLdapCommand(InputStream     in)     throws IOException
          message     =     LDAPMessage.receive(in);
          analyze();
Then finally, the read function where it hangs at "int tag = (int)din.readByte(); "
public static LDAPMessage receive(InputStream is) throws IOException
    * LDAP Message Format =
    *      1. LBER_SEQUENCE                           -- 1 byte
    *      2. Length                                  -- variable length     = 3 + 4 + 5 ....
    *      3. ID                                      -- variable length
    *      4. LDAP_REQ_msg                            -- 1 byte
    *      5. Message specific structure              -- variable length
    DataInputStream din = new DataInputStream(is);
       int tag = (int)din.readByte();      // sequence tag// sequence tag

I suspect you are actually getting an Exception and not tracing the cause properly and then doing a sleep and then getting another Exception. Never ever catch an exception without tracing what it actually is somewhere.
Also I don't know what the sleep is supposed to be for. You will block in readByte() until something comes in, and that should be enough yielding for anybody. The sleep is just literally a waste of time.

Problems reading an SSL server socket stream using readByte()

Hi I'm trying to read an SSL server socket stream using readByte(). I need to use readByte() because my program acts an LDAP proxy (receives LDAP messages from an LDAP client then passes them onto an actual LDAP server. It works fine with normal LDAP data streams but once an SSL data stream is introduced, readByte just hangs! Here is my code.....
help!!! anyone?... anyone?
1. SSL Socket is first read into " InputStream input"
public void     run()
          Authorization     auth = new Authorization();
          try     {
               InputStream     input     =     client.getInputStream();
               while     (true)
               {     StandLdapCommand command;
                    try
                         command = new StandLdapCommand(input);
                         Authorization     t = command.get_auth();
                         if (t != null )
                              auth = t;
                    catch( SocketException e )
                    {     // If socket error, drop the connection
                         Message.Info( "Client connection closed: " + e );
                         close( e );
                         break;
                    catch( EOFException e )
                    {     // If socket error, drop the connection
                         Message.Info( "Client connection close: " + e );
                         close( e );
                         break;
                    catch( Exception e )
                         //Way too many of these to trace them!
                         Message.Error( "Command not processed due to exception");
                         close( e );
                                        break;
                                        //continue;
                    processor.processBefore(auth,     command);
                                try
                                  Thread.sleep(40); //yield to other threads
                                catch(InterruptedException ie) {}
          catch     (Exception e)
               close(e);
2 Then data is sent to an intermediate function
from this statement in the function above:   command = new StandLdapCommand(input);
     public StandLdapCommand(InputStream     in)     throws IOException
          message     =     LDAPMessage.receive(in);
          analyze();
Then finally, the read function where it hangs at "int tag = (int)din.readByte(); "
public static LDAPMessage receive(InputStream is) throws IOException
    * LDAP Message Format =
    *      1. LBER_SEQUENCE                           -- 1 byte
    *      2. Length                                  -- variable length     = 3 + 4 + 5 ....
    *      3. ID                                      -- variable length
    *      4. LDAP_REQ_msg                            -- 1 byte
    *      5. Message specific structure              -- variable length
    DataInputStream din = new DataInputStream(is);
       int tag = (int)din.readByte();      // sequence tag// sequence tag

I suspect you are actually getting an Exception and not tracing the cause properly and then doing a sleep and then getting another Exception. Never ever catch an exception without tracing what it actually is somewhere.
Also I don't know what the sleep is supposed to be for. You will block in readByte() until something comes in, and that should be enough yielding for anybody. The sleep is just literally a waste of time.

SSL Server socket: controlling the alias for the server certificate ?

Hi,
Could anyone please clear up the following ?
When you create an SSL server socket, it needs a certificate (to prove its identity), and for this it relies on a keystore:
System.setProperty("javax.net.ssl.keyStore", "c:/mystore");
My question is, what if the keystore contains several certificates ?
Eg:
keytool -import -alias AAA -file cert1.cer -keystore mystore
keytool -import -alias BBB -file cert2.cer -keystore mystore
Which certificate would the server use ?
And is there a way to control the alias it would use ?
Thanks :)

This is a very good question and one that should be described in the Guide to Features. See javax.net.ssl.X509KeyManager.chooseServerAlias(). It does a search looking for aliases of a given key type, i.e. one of the ones the peer understands, & which are trusted by the peer. Any alias which the peer can accept will do.

JavaMail Server: Sockets and Mail

L.S,
I'm thinking about combining code based on the Java Mail API and the Java networking tutorial (server sockets). I'm thinking I should listen to ports 25 and 110 using SMTP and POP3 protocol classes respectively.
The problem I'm running into right now is that I haven't found a way to translate incoming email messages (bytestreams) into Java Mail objects.
Can anyone point me in the right direction and help me find out how to translate bytes received at ServerSocket objects (ServerSocket(25) and ServerSocket(110)) into Java mails?

Thanks, those are indeed important documents. Currently, I'm able to listen at port 25 for any incoming network transmissions. Unfortunately, when I try sending an email to the machine, the program sending it reports an error about the domain not being found (I also see nothing in my server console).
ServerSocket smtp = new ServerSocket(25);
boolean listening = true;
while (listening) {
    Socket s = smtp.accept();
    PrintWriter out = new PrintWriter(s.getOutputStream(),true);
    BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
    System.out.println(in.readLine());
    out.println("ok");
    listening = false;
s.close();
smtp.close();According to me, the above program should at least print something to the console when another machine in my network sends an email to this machine (all@myclient). Somehow, though, I'm not getting anything...

SSL Server without Server Cert

The SSL specification http://wp.netscape.com/eng/ssl3/3-SPEC.HTM
Section 7.5 Handshake protocol overview
says
That Server Certificates are optional. Is it possible in JSSE to create a SSL Server Socket and start accepting clients without a Server Certificate ?.
Any samples/help appreciated.
regards
Rajesh

Look here:
http://forum.java.sun.com/thread.jsp?forum=2&thread=410373
Good luck!
Grant

Server Socket does not read data input stream

Hi all,
I am very newbie to Java Network programming with sockets and multi-threading.
But I am obliged to develop a chat system written in Applets which can be placed on the website and used by visitors who come to my website.
In order to understand this, I have tested a basic web chat program I downloaded from the Internet which use sockets and multi-threadings. The program work fine, no bugs at all at both compilation and run time. I noticed that all three streams for Client side (i.e. first one is input stream used receiving data from User; the second one is socket input stream used for receiving data from Server socket, and the third is socket output stream used for writing data to server socket) were established. And the same, two socket streams (input & output) for Server side were also connected when running program giving right port number and IP address of the server.
The problem is both server and client sockets do not read data using the following stream classes:
1. DataStreamInput: I use input.readUTF() method
2. or BufferedReader: I use input.readLine() method
The example of the codes are below:
private BufferedReader input = null;
private PrintWriter output = null;
private Socket socket = null;
public void open() throws IOException
{ input = new BufferedReader(new
InputStreamReader(socket.getInputStream()));
System.out.println("Server socket input stream was created, and");
output = new PrintWriter(socket.getOutputStream());
System.out.println("Server socket output stream was created");
public void run()
{ System.out.println("Server Thread " + clientPort + " running.");
while (true)
{ try
System.out.println("Server is reading data from Client, wait...");
String fromClient = input.readLine();
System.out.println("Server received a message on " + clientPort + ".");
catch(IOException ioe)
{ System.out.println(clientPort + " ERROR reading: " + ioe.getMessage());
server.remove(clientPort);
stop();
The problem is at the line: String fromClient = input.readLine(); in the run() method? What is wrong with the codes above?
Note: I also try to use original codes which use readUTF() method in DataStreamInput class instead using readLine() in BufferedReader. Both methods dont read data from inputstream socket?
I very appreciate any help/advice from experienced developers.
Best regards

Hi,
Yes. The readLine() method hangs! After the test, the execuation of the program is stopped at the line of readLine() method; it does not pass it?
There is no problem with writing to Server socket. After the test, the program pass through flush() method. Here is the code for writing to sever socket within ChatClient (client side socket) class:
private BufferedReader input = null;
private PrintWriter           output = null;
public ChatClient(String serverName, int serverPort)
{ System.out.println("Establishing connection. Please wait ...");
try
{ socket = new Socket(serverName, serverPort);
System.out.println("Connected: " + socket);
start();
catch(UnknownHostException uhe)
{ System.out.println("Host unknown: " + uhe.getMessage()); }
catch(IOException ioe)
{ System.out.println("Unexpected exception: " + ioe.getMessage()); }
public void start() throws IOException
{ input   = new BufferedReader (new
                         InputStreamReader(System.in));
System.out.println("Client User input stream was created,");
output = new PrintWriter(socket.getOutputStream());
System.out.println("Client Socket output stream was established, and");
if (thread == null)
{ client = new ChatClientThread(this, socket);
thread = new Thread(this);
thread.start();
public void run()
     while (thread != null) {
     String fromUser;
          try{
               while((fromUser = input.readLine())!= null)
               System.out.println("Client wasreading a data from User, and");
output.println(fromUser);
     output.flush();
     System.out.println("Client has written a data to Server");
catch(IOException ioe)
{ System.out.println("Sending to server error: " + ioe.getMessage());
stop();
etc.
Here is a piece of codes for reading data from the Client Socket in the ChatServer Class (Server Side socket):
public void run()
{ System.out.println("Server Thread " + clientPort + " running.");
while (true)
{ try
{ //server.handle(clientPort, input.readLine());
System.out.println("Server is reading data from Client, wait...");
String fromUser = input.readLine();
//while((fromUser = input.readLine()) != null)
     System.out.println("Server received a message on " + clientPort + ".");
catch(IOException ioe)
{ System.out.println(clientPort + " ERROR reading: " + ioe.getMessage());
server.remove(clientPort);
stop();
etc. Please advice why the readLine() method hangs; does not read data from the input stream received from the CLIENT?

Simple question about sockets and streams - please answer it!

Hi
I have a server socket and a client socket. Both are up and runing. But I'm having problems to send a string from the client and read only the four first bytes on the server. Please read the code and some other comments below:
socket client:
DataOutputStream out =
new DataOutputStream(socket.getOutputStream());
// read from keyboard input
BufferedReader myinput =
new BufferedReader(new InputStreamReader(System.in));
System.out.println("Type any 4 chars and [enter].");
String any = myinput.readLine();
out.writeBytes(any);
out.flush();
server socket:
in = new DataInputStream(socket.getInputStream());
byte[] id = new byte[4];
in.read(id, 0, 4);
System.out.print(new String(id));
According to the code, it should read 4 bytes from the input stream (in.read(id, 0, 4)), but it displays only the first byte. For example, if I type "hello" on client, the serve should show "hell" but it shows just "h"
Any ideias? Thanks!

Hi,
Check the Javadoc for 'in.read(id, 0, 4);' This reads up to 4 bytes and returns the number of bytes read. You need something along the lines of
int count = 0;
while (count < 4)
count += in.read(id, count, 4-count);
Roger

Socket Exception when closing Server Socket Streams if Client closes first

Hi
I have 2 processes - a Server socket and a client socket. If I close the Client process first, and then try closing down the Streams on the Server process, I get a SocketException with message "Socket is closed" when I try and close the 2nd Stream. It does not matter on the order of the Stream being closed down, the exception is always thrown when I try and close the second stream. The code snippets are below:
SERVER =======
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerSocketTest {
public static void main(String args[]) {
try {
ServerSocket ss = new ServerSocket(9999);
Socket s = ss.accept();
// Get refs to streams...
InputStream is = s.getInputStream();
OutputStream os = s.getOutputStream();
// sleep to let client shutdown first...
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
System.err.println(e);
System.err.println("B4 inClose: isBound=" + s.isBound());
System.err.println("B4 inClose: isClosed=" + s.isClosed());
System.err.println("B4 inClose: isConnected=" + s.isConnected());
System.err.println("B4 inClose: isInputShutdown=" + s.isInputShutdown());
System.err.println("B4 inClose: isOutputShutdown=" + s.isOutputShutdown());
s.getInputStream().close();
System.err.println("After inClose: isBound=" + s.isBound());
System.err.println("After inClose: isClosed=" + s.isClosed());
System.err.println("After inClose: isConnected=" + s.isConnected());
System.err.println("After inClose: isInputShutdown=" + s.isInputShutdown());
System.err.println("After inClose: isOutputShutdown=" + s.isOutputShutdown());
s.getOutputStream().close(); // will break here with SocketException!
System.err.println("After outClose: isBound=" + s.isBound());
System.err.println("After outClose: isClosed=" + s.isClosed());
System.err.println("After outClose: isConnected=" + s.isConnected());
System.err.println("After outClose: isInputShutdown=" + s.isInputShutdown());
System.err.println("After outClose: isOutputShutdown=" + s.isOutputShutdown());
s.close();
} catch (Exception e) {
System.err.println(e);
CLIENT ======
import java.net.Socket;
public class ClientSocket {
public static void main(String args[]) {
try {
Socket s = new Socket("localhost", 9999);
try {
// sleep to leave connection up for a while...
Thread.sleep(2000);
} catch (InterruptedException e) {
System.err.println(e);
s.close();
} catch (Exception e) {
System.err.println(e);
The debug shows that isClosed() is set to 'true' after the first call to s.getInputStream().close(). The Sun API Socket class getOutputStream() has a call to isClosed() at the start of the method - it then throws the SocketException that I get. Why does the SocketImpl do this before I get a chance to call a.getOutputStream().close()?
One final thing, the calls to s.isInputShutdown() and s.isOuputShutdown always seem to return false even if the Streams have had their .close() method called.
Any ideas/help here greatly appreciated.
Thanks
Gaz

Ok, I know what's going on now - I needed something to do on Friday afternoon anyhow!
Basically if you call either getOutputStream.close() or getInputStream().close(), the underlying Sun implementation will close the Socket.
Here's what's happening under the covers in the Sun code:
s.getInputStream() is called on the Socket class.
The Socket class holds a reference to the SocketImpl class.
The SocketImpl class is abstract and forces sublclasses to extend it' s getInputStream() method.
The PlainSocketImpl extends SocketImpl.
PlainSocketImpl has a getInputStream() method that returns a SocketInputStream. When the stream is created for the first time, the PlainSocketImpl object is passed into the Constructor.
The SocketInputStream class has a close() method on it. The snippet of code below shows how the socket is closed:
<pre>
* Closes the stream.
private boolean closing = false;
public void close() throws IOException {
     // Prevent recursion. See BugId 4484411
     if (closing)
     return;
     closing = true;
     if (socket != null) {
     if (!socket.isClosed())
          socket.close();
     } else
     impl.close();
     closing = false;
</pre>
So, it seems that out PlainSocketImpl is getting closed for us, hence the SocketException being thrown in Socket.getOutputStream() when I call it after Socket.getInputStream()/
I've not had a look at the reason why the calls to s.isInputShutdown() and s.isOuputShutdown always seem to return false even if the Streams have had their .close() method called though - any thoughts appreciated.
Thanks
G

File transfer to multiple clients from server socket

I have multiple clients connected to my server socket and I need to copy more than 200mb documents from server to all clients over socket. Can we design the issue considering scalability and performance factor? What I am thinking of we should use thread for transferring file from server to client. But at the same time if we have large number of clients then we can't initialize a thread for each client. I think in this case we should initialize less than 10 threads in the pool as the file size is very large. If we keep number of threads in the pool low then probably we have to read multiple times the large server file (once for each group) which might again be a performance bottleneck. Please pour in your suggestions.

File would be same for an instance only. For example say I have a "SEND File" button & �File Path� text box. In File Path suppose user enters the absolute path of the file and then clicks on Send File button. The responsibility of Send File button would be sending the file mentioned in the "File Path" text box to all connected client. But next time user can choose a different file.

Can i run UDP client and UDP server socket program in the same pc ?

hi all.
when i execute my UDP client socket program and UDP server socket program in the same pc ,
It's will shown the error msg :
"Address already in use: Cannot bind"
but if i run UDP client socket program in the remote pc and UDP server socket program run in local pc , it's will success.
anybody know what's going on ?
any help will be appreciated !

bobby92 wrote:
i have use a specified port for UDP server side , and for client define the server port "DatagramSocket clientSocket= new DatagramSocket(Server_PORT);"Why? The port you provide here is not the target port. It's the local port you listen on. That's only necessary when you want other hosts to connect to you (i.e. when you're acting as a server).
The server should be using that constructor, the client should not be specifying a port.
so when i start the udp server code to listen in local pc , then when i start UDP client code in local pc ,i will get the error "Address already in use: Cannot bind"Because your client tries to bind to the same port that the server already bound to.

Should i create a client and a server socket in a same application

Greetings,
In which situation sould i have a server socket ? and in which situation should i have a client socket ?and in which situation should i have both?
I 'm making a app. who receives info (like alarms ) from a automation machine and also that same app. as a scheduler who send commands according to dates to the automation machine.
Now the automation machine is programmed like a socket tcp/ip server who is always on and the app. is a client.
Every time there's an alarm the machine sends me the info and i put it in a mysql database.
Every time there's an event programmed the app. sends a string to the machine.
The question is that i can't maintain that socket always connected, Sometimes disconnets.
I was thinking of making the change of creating in both sides a server and a client, so that, for example, in the app. the client woul d handle the event msgs and the server would accecpt connections with alarms from the automaition machine.
Since i'm a newbie in Java could somebody give me some tips, please?
Thanks

Thanks Peter....
But i already do that....
I have a thread who handles the connection management.
If by some reaseon the connection is lost the thread reconnects it.
My problem is that sometimes it reconnects every second, and i loose info provided by the automatian machine.
The best thing to have it would be a socket listener, but Java does have any.
Is there any API that does a socket listener?

Bluetooth communication between J2SE server and J2ME client

Hi everyone!
I'm new here in this forum...
I try to make a small project to my studies,
My project will include J2SE server and J2ME client.
I'm stuck in the step of finding the server with the wireless toolkit emulator.
I found this issue in old subject: here
I try the solution in reply 6 but I don't understand exactly who to define kvem.home, and I got this error:
" You must define the system property "kvem.home" "
maybe someone can help me and explain how to do that?
thanks!

Hello,
I want to find out how this can be done, too. I tried with
System.setProperty("kvem.home", "C:\\WTK2.5.2");but I get an error:
java.lang.UnsatisfiedLinkError: com.sun.kvem.jsr082.impl.bluetooth.BluetoothController.setSystemProperty(Ljava/lang/String;Ljava/lang/String;)I included these files in the build path:
c:\WTK2.5.2\wtklib\gcf-op.jar
c:\WTK2.5.2\wtklib\kenv.zip
c:\WTK2.5.2\wtklib\kvem.jar
and I import com.sun.kvem.bluetooth.*;
I'd appreciate any help.

Weblogic server 9.2 and SSL server certificate for the wrong site

I turned on SSL service for a weblogic 9.2 server and later on changed the hostname of the machine that weblogic was running on. So the hostname that my SSL server certificate was issued to has now became an invalid hostname. But my weblogic server continues to run SSL service without any exception. I can still access my web applications thru the SSL port (except of course I get a warning for the server certificate every time that it is for the "wrong site"). My question is this: should weblogic 9.2 verify the hostname in the server certificate and stop SSL service if the certificate is for the wrong site? Or is verifying the certificate strictly the job of the browser? Just want to make sure there is nothing wrong with my SSL configuration. Thanks.

So you are saying that something is wrong with my weblogic 9.2 ssl configuration? And that given a server certificate issued to a different hostname, my weblogic server should NOT be servicing ssl request and/or it should throw some sort of exception during startup? Thanks for clarifying.

SSL Server Socket and j2me

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