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 java.io.OutputStream;
28 import java.nio.file.Path;
29 import java.nio.file.Paths;
30 import java.security.KeyPair;
31 import org.apache.sshd.client.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.client.session.ClientSession;
36 import org.apache.sshd.common.keyprovider.FileKeyPairProvider;
37 import org.apache.sshd.common.keyprovider.KeyPairProvider;
38 import org.onap.ccsdk.sli.adaptors.saltstack.model.Constants;
39 import org.onap.ccsdk.sli.adaptors.saltstack.model.SshException;
40 import com.att.eelf.configuration.EELFLogger;
41 import com.att.eelf.configuration.EELFManager;
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).getSession();
83 if (password != null) {
84 clientSession.addPasswordIdentity(password);
85 } else if (keyFile != null) {
86 Path keyFilePath = Paths.get(keyFile);
87 KeyPairProvider keyPairProvider = new FileKeyPairProvider(keyFilePath);
88 KeyPair keyPair = keyPairProvider.loadKeys().iterator().next();
89 clientSession.addPublicKeyIdentity(keyPair);
91 AuthFuture authFuture = clientSession.auth();
92 authFuture.await(AUTH_TIMEOUT);
93 if (!authFuture.isSuccess()) {
94 throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port
95 + "]. Authentication failed.");
97 } catch (RuntimeException e) {
99 } catch (Exception e) {
100 throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port + "].",
103 if (logger.isDebugEnabled()) {
104 logger.debug("SSH: connected to [" + toString() + "]");
108 public void connectWithRetry() {
112 retryCount = Constants.DEFAULT_CONNECTION_RETRY_COUNT;
113 retryDelay = Constants.DEFAULT_CONNECTION_RETRY_DELAY;
114 retriesLeft = retryCount + 1;
119 } catch (RuntimeException e) {
120 if (retriesLeft > 1) {
121 logger.debug("SSH Connection failed. Waiting for change in server's state.");
122 waitForConnection(retryDelay);
124 logger.debug("Retrying SSH connection. Attempt [" + Integer.toString(retryCount - retriesLeft + 1)
125 + "] out of [" + retryCount + "]");
130 } while (retriesLeft > 0);
133 public void disconnect() {
135 if (logger.isDebugEnabled()) {
136 logger.debug("SSH: disconnecting from [" + toString() + "]");
138 clientSession.close(false);
140 if (sshClient != null) {
146 public void setExecTimeout(long timeout) {
147 this.timeout = timeout;
150 public int execCommand(String cmd, OutputStream out, OutputStream err) {
151 return execCommand(cmd, out, err, false);
154 public int execCommandWithPty(String cmd, OutputStream out) {
155 return execCommand(cmd, out, out, true);
158 private int execCommand(String cmd, OutputStream out, OutputStream err, boolean usePty) {
160 if (logger.isDebugEnabled()) {
161 logger.debug("SSH: executing command");
163 ChannelExec client = clientSession.createExecChannel(cmd);
164 client.setUsePty(usePty); // use pseudo-tty?
167 OpenFuture openFuture = client.open();
170 client.wait(timeout);
172 Integer exitStatusI = client.getExitStatus();
173 if (exitStatusI == null) {
174 throw new SshException("Error executing command [" + cmd + "] over SSH [" + username + "@" + host
175 + ":" + port + "]. Operation timed out.");
177 exitStatus = exitStatusI;
182 } catch (RuntimeException e) {
184 } catch (Exception e1) {
185 throw new SshException(
186 "Error executing command [" + cmd + "] over SSH [" + username + "@" + host + ":" + port + "]", e1);
190 private void waitForConnection(int retryDelay) {
191 long time = retryDelay * 1000L;
192 long future = System.currentTimeMillis() + time;
194 while (System.currentTimeMillis() < future && time > 0) {
197 } catch (InterruptedException e) {
199 * This is rare, but it can happen if another thread interrupts us while we are sleeping. In that
200 * case, the thread is resumed before the delay time has actually expired, so re-calculate the
201 * amount of delay time needed and reenter the sleep until we get to the future time.
203 time = future - System.currentTimeMillis();
210 public String toString() {
211 String address = host;
212 if (username != null) {
213 address = username + '@' + address + ':' + port;