Example usage for java.lang SecurityManager checkListen

Introduction

In this page you can find the example usage for java.lang SecurityManager checkListen.

Prototype

public void checkListen(int port) 

Source Link

Document

Throws a SecurityException if the calling thread is not allowed to wait for a connection request on the specified local port number.

Usage

From source file:Main.java

public static void main(String[] args) {
    System.setProperty("java.security.policy", "file:/C:/java.policy");

    SecurityManager sm = new Main();

    System.setSecurityManager(sm);

    // perform the check
    sm.checkListen(8080);

    System.out.println("Allowed!");
}

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From source file:Tcpbw100.java

public boolean test_sfw(Protocol ctl) throws IOException {
    Message msg = new Message();
    if ((tests & TEST_SFW) == TEST_SFW) {
        showStatus(messages.getString("sfwTest"));
        results.append(messages.getString("checkingFirewalls") + "  ");
        statistics.append(messages.getString("checkingFirewalls") + "  ");
        emailText = messages.getString("checkingFirewalls") + "  ";
        pub_status = "checkingFirewalls";

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }//ww w  . j  a  va 2s .c  o m
        if (msg.type != TEST_PREPARE) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }

        String message = new String(msg.body);

        int srvPort, testTime;
        try {
            int k = message.indexOf(" ");
            srvPort = Integer.parseInt(message.substring(0, k));
            testTime = Integer.parseInt(message.substring(k + 1));
        } catch (Exception e) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            return true;
        }

        System.out.println("SFW: port=" + srvPort);
        System.out.println("SFW: testTime=" + testTime);

        ServerSocket srvSocket;
        try {
            SecurityManager security = System.getSecurityManager();
            if (security != null) {
                System.out.println("Asking security manager for listen permissions...");
                security.checkListen(0);
            }
            srvSocket = new ServerSocket(0);
        } catch (Exception e) {
            e.printStackTrace();
            errmsg = messages.getString("sfwSocketFail") + "\n";
            return true;
        }

        System.out.println("SFW: oport=" + srvSocket.getLocalPort());
        ctl.send_msg(TEST_MSG, Integer.toString(srvSocket.getLocalPort()).getBytes());

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }
        if (msg.type != TEST_START) {
            errmsg = messages.getString("sfwWrongMessage");
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }

        OsfwWorker osfwTest = new OsfwWorker(srvSocket, testTime);
        new Thread(osfwTest).start();

        Socket sfwSocket = new Socket();
        try {
            sfwSocket.connect(new InetSocketAddress(host, srvPort), testTime * 1000);

            Protocol sfwCtl = new Protocol(sfwSocket);
            sfwCtl.send_msg(TEST_MSG, new String("Simple firewall test").getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }
        if (msg.type != TEST_MSG) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }
        c2sResult = Integer.parseInt(new String(msg.body));

        osfwTest.finalize();

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }
        if (msg.type != TEST_FINALIZE) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }
        results.append(messages.getString("done") + "\n");
        statistics.append(messages.getString("done") + "\n");
        emailText += messages.getString("done") + "\n%0A";
    }
    return false;
}

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