2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2018 Samsung Electronics. All rights reserved.
6 * ================================================================================
8 * =============================================================================
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
22 * ============LICENSE_END=========================================================
25 package org.onap.ccsdk.sli.adaptors.saltstack.impl;
27 import com.att.eelf.configuration.EELFLogger;
28 import com.att.eelf.configuration.EELFManager;
29 import org.apache.sshd.ClientChannel;
30 import org.apache.sshd.ClientSession;
31 import org.apache.sshd.SshClient;
32 import org.apache.sshd.client.channel.ChannelExec;
33 import org.apache.sshd.client.future.AuthFuture;
34 import org.apache.sshd.client.future.OpenFuture;
35 import org.apache.sshd.common.KeyPairProvider;
36 import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
37 import org.onap.ccsdk.sli.adaptors.saltstack.model.Constants;
38 import org.onap.ccsdk.sli.adaptors.saltstack.model.SshException;
40 import java.io.OutputStream;
41 import java.security.KeyPair;
44 * Implementation of SshConnection interface based on Apache MINA SSHD library.
48 private static final EELFLogger logger = EELFManager.getInstance().getApplicationLogger();
50 private static final long AUTH_TIMEOUT = 60000;
51 private static final long EXEC_TIMEOUT = 120000;
54 private String username;
55 private String password;
56 private long timeout = EXEC_TIMEOUT;
57 private String keyFile;
58 private SshClient sshClient;
59 private ClientSession clientSession;
61 public SshConnection(String host, int port, String username, String password, String keyFile) {
64 this.username = username;
65 this.password = password;
66 this.keyFile = keyFile;
69 public SshConnection(String host, int port, String username, String password) {
70 this(host, port, username, password, null);
73 public SshConnection(String host, int port, String keyFile) {
74 this(host, port, null, null, keyFile);
77 public void connect() {
78 sshClient = SshClient.setUpDefaultClient();
82 sshClient.connect(username, host, port).await().getSession();
83 if (password != null) {
84 clientSession.addPasswordIdentity(password);
85 } else if (keyFile != null) {
86 KeyPairProvider keyPairProvider = new FileKeyPairProvider(new String[]{
89 KeyPair keyPair = keyPairProvider.loadKeys().iterator().next();
90 clientSession.addPublicKeyIdentity(keyPair);
92 AuthFuture authFuture = clientSession.auth();
93 authFuture.await(AUTH_TIMEOUT);
94 if (!authFuture.isSuccess()) {
95 throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port
96 + "]. Authentication failed.");
98 } catch (RuntimeException e) {
100 } catch (Exception e) {
101 throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port + "].",
104 if (logger.isDebugEnabled()) {
105 logger.debug("SSH: connected to [" + toString() + "]");
109 public void connectWithRetry() {
113 retryCount = Constants.DEFAULT_CONNECTION_RETRY_COUNT;
114 retryDelay = Constants.DEFAULT_CONNECTION_RETRY_DELAY;
115 retriesLeft = retryCount + 1;
120 } catch (RuntimeException e) {
121 if (retriesLeft > 1) {
122 logger.debug("SSH Connection failed. Waiting for change in server's state.");
123 waitForConnection(retryDelay);
125 logger.debug("Retrying SSH connection. Attempt [" + Integer.toString(retryCount - retriesLeft + 1)
126 + "] out of [" + retryCount + "]");
131 } while (retriesLeft > 0);
134 public void disconnect() {
136 if (logger.isDebugEnabled()) {
137 logger.debug("SSH: disconnecting from [" + toString() + "]");
139 clientSession.close(false);
141 if (sshClient != null) {
147 public void setExecTimeout(long timeout) {
148 this.timeout = timeout;
151 public int execCommand(String cmd, OutputStream out, OutputStream err) {
152 return execCommand(cmd, out, err, false);
155 public int execCommandWithPty(String cmd, OutputStream out) {
156 return execCommand(cmd, out, out, true);
159 private int execCommand(String cmd, OutputStream out, OutputStream err, boolean usePty) {
161 if (logger.isDebugEnabled()) {
162 logger.debug("SSH: executing command");
164 ChannelExec client = clientSession.createExecChannel(cmd);
165 client.setUsePty(usePty); // use pseudo-tty?
168 OpenFuture openFuture = client.open();
171 client.waitFor(ClientChannel.CLOSED, timeout);
173 Integer exitStatusI = client.getExitStatus();
174 if (exitStatusI == null) {
175 throw new SshException("Error executing command [" + cmd + "] over SSH [" + username + "@" + host
176 + ":" + port + "]. Operation timed out.");
178 exitStatus = exitStatusI;
183 } catch (RuntimeException e) {
185 } catch (Exception e1) {
186 throw new SshException(
187 "Error executing command [" + cmd + "] over SSH [" + username + "@" + host + ":" + port + "]", e1);
191 private void waitForConnection(int retryDelay) {
192 long time = retryDelay * 1000L;
193 long future = System.currentTimeMillis() + time;
195 while (System.currentTimeMillis() < future && time > 0) {
198 } catch (InterruptedException e) {
200 * This is rare, but it can happen if another thread interrupts us while we are sleeping. In that
201 * case, the thread is resumed before the delay time has actually expired, so re-calculate the
202 * amount of delay time needed and reenter the sleep until we get to the future time.
204 time = future - System.currentTimeMillis();
211 public String toString() {
212 String address = host;
213 if (username != null) {
214 address = username + '@' + address + ':' + port;