Example usage for org.apache.commons.net.io CRLFLineReader readLine

Introduction

In this page you can find the example usage for org.apache.commons.net.io CRLFLineReader readLine.

Prototype

@Override
public String readLine() throws IOException 

Source Link

Document

Read a line of text.

Usage

From source file:org.opennms.netmgt.poller.monitors.SmtpMonitor.java

/**
 * {@inheritDoc}/*from   w ww. j  a va 2s .com*/
 *
 * <P>
 * Poll the specified address for SMTP service availability.
 * </P>
 *
 * <P>
 * During the poll an attempt is made to connect on the specified port (by
 * default TCP port 25). If the connection request is successful, the banner
 * line generated by the interface is parsed and if the extracted return
 * code indicates that we are talking to an SMTP server we continue. Next,
 * an SMTP 'HELO' command is sent to the interface. Again the response is
 * parsed and a return code extracted and verified. Finally, an SMTP 'QUIT'
 * command is sent. Provided that the interface's response is valid we set
 * the service status to SERVICE_AVAILABLE and return.
 * </P>
 */
@Override
public PollStatus poll(MonitoredService svc, Map<String, Object> parameters) {
    NetworkInterface<InetAddress> iface = svc.getNetInterface();

    // Get interface address from NetworkInterface
    //
    if (iface.getType() != NetworkInterface.TYPE_INET) {
        throw new NetworkInterfaceNotSupportedException(
                "Unsupported interface type, only TYPE_INET currently supported");
    }

    TimeoutTracker tracker = new TimeoutTracker(parameters, DEFAULT_RETRY, DEFAULT_TIMEOUT);

    int port = ParameterMap.getKeyedInteger(parameters, "port", DEFAULT_PORT);

    // Get interface address from NetworkInterface
    //
    InetAddress ipAddr = iface.getAddress();

    final String hostAddress = InetAddressUtils.str(ipAddr);
    LOG.debug("poll: address = {}, port = {}, {}", hostAddress, port, tracker);

    PollStatus serviceStatus = PollStatus.unavailable();

    for (tracker.reset(); tracker.shouldRetry() && !serviceStatus.isAvailable(); tracker.nextAttempt()) {
        Socket socket = null;
        try {
            // create a connected socket
            //
            tracker.startAttempt();

            socket = new Socket();
            socket.connect(new InetSocketAddress(ipAddr, port), tracker.getConnectionTimeout());
            socket.setSoTimeout(tracker.getSoTimeout());

            LOG.debug("SmtpMonitor: connected to host: {} on port: {}", ipAddr, port);

            // We're connected, so upgrade status to unresponsive
            serviceStatus = PollStatus.unresponsive();
            // Forcing to check for CRLF instead of any other line terminator as per RFC specification
            CRLFLineReader rdr = new CRLFLineReader(new InputStreamReader(socket.getInputStream(), "ASCII"));

            //
            // Tokenize the Banner Line, and check the first
            // line for a valid return.
            //
            String banner = sendMessage(socket, rdr, null);
            LOG.debug("poll: banner = {}", banner);

            StringTokenizer t = new StringTokenizer(banner);
            int rc = Integer.parseInt(t.nextToken());
            if (rc == 220) {
                //
                // Send the HELO command
                //
                String cmd = "HELO " + LOCALHOST_NAME + "\r\n";
                socket.getOutputStream().write(cmd.getBytes());

                //
                // get the returned string, tokenize, and
                // verify the correct output.
                //
                String response = rdr.readLine();
                double responseTime = tracker.elapsedTimeInMillis();

                if (response == null) {
                    continue;
                }

                if (MULTILINE.matcher(response).find()) {
                    // Ok we have a multi-line response...first three
                    // chars of the response line are the return code.
                    // The last line of the response will start with
                    // return code followed by a space.
                    String multiLineRC = new String(response.getBytes("ASCII"), 0, 3, "ASCII");

                    // Create new regExp to look for last line
                    // of this multi line response
                    Pattern endMultiline = null;
                    try {
                        endMultiline = Pattern.compile(multiLineRC);
                    } catch (PatternSyntaxException ex) {
                        throw new java.lang.reflect.UndeclaredThrowableException(ex);
                    }

                    // read until we hit the last line of the multi-line
                    // response
                    do {
                        response = rdr.readLine();
                    } while (response != null && !endMultiline.matcher(response).find());
                    if (response == null) {
                        continue;
                    }
                }

                t = new StringTokenizer(response);
                rc = Integer.parseInt(t.nextToken());
                if (rc == 250) {
                    response = sendMessage(socket, rdr, "QUIT\r\n");

                    t = new StringTokenizer(response);
                    rc = Integer.parseInt(t.nextToken());

                    if (rc == 221) {
                        serviceStatus = PollStatus.available(responseTime);
                    }
                }
            } else if (rc == 554) {
                String response = sendMessage(socket, rdr, "QUIT\r\n");
                serviceStatus = PollStatus.unavailable("Server rejecting transactions with 554");
            }

            // If we get this far and the status has not been set to
            // available, then something didn't verify during the banner
            // checking or HELO/QUIT comand process.
            if (!serviceStatus.isAvailable()) {
                serviceStatus = PollStatus.unavailable(serviceStatus.getReason());
            }
        } catch (NumberFormatException e) {
            String reason = "NumberFormatException while polling address " + hostAddress;
            LOG.debug(reason, e);
            serviceStatus = PollStatus.unavailable(reason);
        } catch (NoRouteToHostException e) {
            String reason = "No route to host exception for address " + hostAddress;
            LOG.debug(reason, e);
            serviceStatus = PollStatus.unavailable(reason);
            break; // Break out of for(;;)
        } catch (InterruptedIOException e) {
            String reason = "Did not receive expected response within timeout " + tracker;
            LOG.debug(reason);
            serviceStatus = PollStatus.unavailable(reason);
        } catch (ConnectException e) {
            String reason = "Unable to connect to address " + hostAddress;
            LOG.debug(reason, e);
            serviceStatus = PollStatus.unavailable(reason);
        } catch (IOException e) {
            String reason = "IOException while polling address " + hostAddress;
            LOG.debug(reason, e);
            serviceStatus = PollStatus.unavailable(reason);
        } finally {
            try {
                // Close the socket
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
                e.fillInStackTrace();
                LOG.debug("poll: Error closing socket.", e);
            }
        }
    }

    //
    // return the status of the service
    //
    return serviceStatus;
}

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