NETCONF Flow Rule Provider Check-in after modification.

Change-Id: I7b1b9953cfd44dc43fc932ca57cd5accd11bdb1b

@@ -37,6 +37,11 @@
             <artifactId>onos-netconf-provider-device</artifactId>
             <version>${project.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-netconf-provider-flow</artifactId>
+            <version>${project.version}</version>
+        </dependency>
         <!-- TODO: add other dependencies here as more bundles are added to the app -->
     </dependencies>
 

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.provider.netconf.flow.impl;
+
+import static org.onlab.util.Tools.delay;
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.io.IOException;
+
+import org.slf4j.Logger;
+
+import com.tailf.jnc.Capabilities;
+import com.tailf.jnc.JNCException;
+import com.tailf.jnc.SSHConnection;
+import com.tailf.jnc.SSHSession;
+
+/**
+ * This is to carry necessary information to connect and execute NETCONF
+ * operations.
+ */
+public class NetconfOperation {
+    private final Logger log = getLogger(NetconfOperation.class);
+    private static final int EVENTINTERVAL = 2000;
+    private static final int CONNECTION_CHECK_INTERVAL = 3;
+    private static final String INPUT_HELLO_XML_MSG = new StringBuilder(
+                                                                        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>")
+            .append("<hello xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">")
+            .append("<capabilities><capability>urn:ietf:params:netconf:base:1.0</capability>")
+            .append("</capabilities></hello>").toString();
+
+    /**
+     * This will send a Xml message to the device.
+     */
+    protected void sendXmlMessage(String xmlMsg, String username,
+                                  String password, String deviceIp,
+                                  Integer devicePort) {
+        SSHSession ssh = null;
+        try {
+            SSHConnection sshConnection = getConnection(username, password,
+                                                        deviceIp, devicePort);
+            ssh = new SSHSession(sshConnection);
+            executeMessage(ssh, INPUT_HELLO_XML_MSG);
+            /*
+             * execute acl message
+             */
+            executeMessage(ssh, xmlMsg);
+
+        } catch (IOException e) {
+            log.error("Unable to send Hello Message to the device: ", e);
+        } catch (JNCException e) {
+            log.error("Authentication fail while sending Hello Message to the device: ",
+                      e);
+        } catch (Exception e) {
+            log.error("Unable to send Hello Message to the device: ", e);
+        } finally {
+            log.debug("Closing the session after successful execution");
+            ssh.close();
+        }
+    }
+
+    private void executeMessage(SSHSession ssh, String xmlMsg)
+            throws IOException, JNCException {
+        String helloRequestXML = xmlMsg.trim();
+
+        log.debug("Sending Hello");
+        ssh.print(helloRequestXML);
+        ssh.flush();
+        String xmlResponse = null;
+        int i = CONNECTION_CHECK_INTERVAL;
+        while (!ssh.ready() && i > 0) {
+            delay(EVENTINTERVAL);
+            i--;
+        }
+
+        if (ssh.ready()) {
+            StringBuffer readOne = ssh.readOne();
+            if (readOne == null) {
+                log.error("The Hello Contains No Capabilites");
+                throw new JNCException(
+                                       JNCException.SESSION_ERROR,
+                                       "server does not support NETCONF base capability: "
+                                               + Capabilities.NETCONF_BASE_CAPABILITY);
+            } else {
+                xmlResponse = readOne.toString().trim();
+
+                log.debug("Reading Capabilities: "
+                        + ssh.getSSHConnection().getGanymedConnection()
+                                .getHostname());
+            }
+        }
+    }
+
+    /**
+     * To establish SSH Connection.
+     */
+    public SSHConnection getConnection(String username, String password,
+                                       String sshHost, Integer sshPort)
+            throws Exception {
+        SSHConnection sshConnection;
+        try {
+            sshConnection = new SSHConnection(sshHost, sshPort);
+            sshConnection.authenticateWithPassword(username, password);
+        } catch (IOException e) {
+            log.error("Unable to create a connection to the device: ");
+            throw e;
+        } catch (JNCException e) {
+            log.error("Failed to connect to the device: ");
+            throw e;
+        }
+        return sshConnection;
+    }
+
+}

@@ -34,6 +34,7 @@
     <modules>
         <module>device</module>
         <module>app</module>
+        <module>flow</module>
     </modules>
 
     <dependencies>