diff options
Diffstat (limited to 'saltstack-adapter/saltstack-adapter-provider/src/main/java/org/onap/ccsdk/sli/adaptors/saltstack/impl/SshConnection.java')
| -rw-r--r-- | saltstack-adapter/saltstack-adapter-provider/src/main/java/org/onap/ccsdk/sli/adaptors/saltstack/impl/SshConnection.java | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/saltstack-adapter/saltstack-adapter-provider/src/main/java/org/onap/ccsdk/sli/adaptors/saltstack/impl/SshConnection.java b/saltstack-adapter/saltstack-adapter-provider/src/main/java/org/onap/ccsdk/sli/adaptors/saltstack/impl/SshConnection.java new file mode 100644 index 000000000..25d2d8402 --- /dev/null +++ b/saltstack-adapter/saltstack-adapter-provider/src/main/java/org/onap/ccsdk/sli/adaptors/saltstack/impl/SshConnection.java @@ -0,0 +1,217 @@ +/*- + * ============LICENSE_START======================================================= + * ONAP : CCSDK + * ================================================================================ + * Copyright (C) 2018 Samsung Electronics. All rights reserved. + * ================================================================================ + * + * ============================================================================= + * 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. + * + * + * ============LICENSE_END========================================================= + */ + +package org.onap.ccsdk.sli.adaptors.saltstack.impl; + +import java.io.OutputStream; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.security.KeyPair; +import org.apache.sshd.client.SshClient; +import org.apache.sshd.client.channel.ChannelExec; +import org.apache.sshd.client.future.AuthFuture; +import org.apache.sshd.client.future.OpenFuture; +import org.apache.sshd.client.session.ClientSession; +import org.apache.sshd.common.keyprovider.FileKeyPairProvider; +import org.apache.sshd.common.keyprovider.KeyPairProvider; +import org.onap.ccsdk.sli.adaptors.saltstack.model.Constants; +import org.onap.ccsdk.sli.adaptors.saltstack.model.SshException; +import com.att.eelf.configuration.EELFLogger; +import com.att.eelf.configuration.EELFManager; + +/** + * Implementation of SshConnection interface based on Apache MINA SSHD library. + */ +class SshConnection { + + private static final EELFLogger logger = EELFManager.getInstance().getApplicationLogger(); + + private static final long AUTH_TIMEOUT = 60000; + private static final long EXEC_TIMEOUT = 120000; + private String host; + private int port; + private String username; + private String password; + private long timeout = EXEC_TIMEOUT; + private String keyFile; + private SshClient sshClient; + private ClientSession clientSession; + + public SshConnection(String host, int port, String username, String password, String keyFile) { + this.host = host; + this.port = port; + this.username = username; + this.password = password; + this.keyFile = keyFile; + } + + public SshConnection(String host, int port, String username, String password) { + this(host, port, username, password, null); + } + + public SshConnection(String host, int port, String keyFile) { + this(host, port, null, null, keyFile); + } + + public void connect() { + sshClient = SshClient.setUpDefaultClient(); + sshClient.start(); + try { + clientSession = + sshClient.connect(username, host, port).getSession(); + if (password != null) { + clientSession.addPasswordIdentity(password); + } else if (keyFile != null) { + Path keyFilePath = Paths.get(keyFile); + KeyPairProvider keyPairProvider = new FileKeyPairProvider(keyFilePath); + KeyPair keyPair = keyPairProvider.loadKeys().iterator().next(); + clientSession.addPublicKeyIdentity(keyPair); + } + AuthFuture authFuture = clientSession.auth(); + authFuture.await(AUTH_TIMEOUT); + if (!authFuture.isSuccess()) { + throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port + + "]. Authentication failed."); + } + } catch (RuntimeException e) { + throw e; + } catch (Exception e) { + throw new SshException("Error establishing ssh connection to [" + username + "@" + host + ":" + port + "].", + e); + } + if (logger.isDebugEnabled()) { + logger.debug("SSH: connected to [" + toString() + "]"); + } + } + + public void connectWithRetry() { + int retryCount; + int retryDelay; + int retriesLeft; + retryCount = Constants.DEFAULT_CONNECTION_RETRY_COUNT; + retryDelay = Constants.DEFAULT_CONNECTION_RETRY_DELAY; + retriesLeft = retryCount + 1; + do { + try { + this.connect(); + break; + } catch (RuntimeException e) { + if (retriesLeft > 1) { + logger.debug("SSH Connection failed. Waiting for change in server's state."); + waitForConnection(retryDelay); + retriesLeft--; + logger.debug("Retrying SSH connection. Attempt [" + Integer.toString(retryCount - retriesLeft + 1) + + "] out of [" + retryCount + "]"); + } else { + throw e; + } + } + } while (retriesLeft > 0); + } + + public void disconnect() { + try { + if (logger.isDebugEnabled()) { + logger.debug("SSH: disconnecting from [" + toString() + "]"); + } + clientSession.close(false); + } finally { + if (sshClient != null) { + sshClient.stop(); + } + } + } + + public void setExecTimeout(long timeout) { + this.timeout = timeout; + } + + public int execCommand(String cmd, OutputStream out, OutputStream err) { + return execCommand(cmd, out, err, false); + } + + public int execCommandWithPty(String cmd, OutputStream out) { + return execCommand(cmd, out, out, true); + } + + private int execCommand(String cmd, OutputStream out, OutputStream err, boolean usePty) { + try { + if (logger.isDebugEnabled()) { + logger.debug("SSH: executing command"); + } + ChannelExec client = clientSession.createExecChannel(cmd); + client.setUsePty(usePty); // use pseudo-tty? + client.setOut(out); + client.setErr(err); + OpenFuture openFuture = client.open(); + int exitStatus; + try { + client.wait(timeout); + openFuture.verify(); + Integer exitStatusI = client.getExitStatus(); + if (exitStatusI == null) { + throw new SshException("Error executing command [" + cmd + "] over SSH [" + username + "@" + host + + ":" + port + "]. Operation timed out."); + } + exitStatus = exitStatusI; + } finally { + client.close(false); + } + return exitStatus; + } catch (RuntimeException e) { + throw e; + } catch (Exception e1) { + throw new SshException( + "Error executing command [" + cmd + "] over SSH [" + username + "@" + host + ":" + port + "]", e1); + } + } + + private void waitForConnection(int retryDelay) { + long time = retryDelay * 1000L; + long future = System.currentTimeMillis() + time; + if (time != 0) { + while (System.currentTimeMillis() < future && time > 0) { + try { + Thread.sleep(time); + } catch (InterruptedException e) { + /* + * This is rare, but it can happen if another thread interrupts us while we are sleeping. In that + * case, the thread is resumed before the delay time has actually expired, so re-calculate the + * amount of delay time needed and reenter the sleep until we get to the future time. + */ + time = future - System.currentTimeMillis(); + } + } + } + } + + @Override + public String toString() { + String address = host; + if (username != null) { + address = username + '@' + address + ':' + port; + } + return address; + } +} |