Invoke WLST commands with JSch - java

I'm trying to run a restart server command on WLST through a remote Java web app.
This is what I'm trying to execute:
StringBuilder sb = new StringBuilder();
sb.append("/u01/app/oracle/jdk1.8.0_65/bin/./java -cp /u01/app/oracle/product/Oracle_Home/wlserver/server/lib/weblogic.jar weblogic.WLST");
sb.append(";connect(\'weblogic\',\'" + consolePass + "\',\'" + fullAddress + "\')");
sb.append(";domainRuntime()");
sb.append(";cd(\'/ServerLifeCycleRuntimes/" + serverName + "\')");
sb.append(";cmo.shutdown())");
sb.append(";start(" + serverName + ",'Server')");
String command = sb.toString();
JSch jsch = new JSch();
Session session = jsch.getSession(user, host, port);
session.setUserInfo(new OracleUserInfo(pass));
session.connect();
Channel channel = session.openChannel("exec");
((ChannelExec) channel).setCommand(command);
channel.setInputStream(null);
((ChannelExec) channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
channel.connect();
byte[] tmp = new byte[1024];
while (true) {
while (in.available() > 0) {
int i = in.read(tmp, 0, 1024);
if (i < 0)
break;
System.out.print(new String(tmp, 0, i));
}
if (channel.isClosed()) {
if (in.available() > 0)
continue;
System.out.println("exit-status: " + channel.getExitStatus());
break;
}
try {
Thread.sleep(1000);
} catch (Exception ee) {
}
}
channel.disconnect();
session.disconnect();
I'm using ';' to separate the commands, since I thought it was required to run multiple commands.
Unfortunately, it gives a syntax error on line 2.
bash: -c: line 0: syntax error near unexpected token 'weblogic','password','t3://host:7001''
bash: -c: line 0:/u01/app/oracle/jdk1.8.0_65/bin/./java -cp /u01/app/oracle/product/Oracle_Home/wlserver/server/lib/weblogic.jar weblogic.WLST;connect('weblogic','password','t3://host:7001')'
I tried to add \n after the first line, and the result was that the first line was executed (so it entered WLST), but none of the remaining commands were.
StringBuilder sb = new StringBuilder();
sb.append("/u01/app/oracle/jdk1.8.0_65/bin/./java -cp /u01/app/oracle/product/Oracle_Home/wlserver/server/lib/weblogic.jar weblogic.WLST\n");
sb.append(";connect(\'weblogic\',\'" + consolePass + "\',\'" + fullAddress + "\')\n");
sb.append(";domainRuntime()\n");
sb.append(";cd(\'/ServerLifeCycleRuntimes/" + serverName + "\')\n");
sb.append(";cmo.shutdown())\n");
String command = sb.toString();
Result:
Initializing WebLogic Scripting Tool (WLST) ...
Welcome to WebLogic Server Administration Scripting Shell
Type help() for help on available commands
wls:/offline>
I tested the command manually and it worked. The problem seems to be with JSch with WLST interface, since it opens another shell interface.
Any ideas how I could run WLST commands with JSch?
PS1: I know my JSch code works because I have a feature on the same app to deploy. Basically, it runs a jscp to upload the war, and then ssh to execute the weblogic.Deployer -deploy command.
PS2: I do have a .py script to do that, but as of now, it must be on the server to be executed. I'm thinking about doing an jscp to a temp folder, run the script and then delete. But I'm curious to find out how to run multiple commands on WLST with JSch.
Thanks in advance.
UPDATE
Code working (Thanks Martin)
Channel channel = session.openChannel("exec");
((ChannelExec) channel).setCommand(command);
InputStream in = channel.getInputStream();
OutputStream out = channel.getOutputStream();
((ChannelExec) channel).setErrStream(System.err);
channel.connect();
for (String wlstCommand : wlstCommands) {
out.write((wlstCommand).getBytes());
}
out.flush();

The ; can indeed by used in *nix based system to execute multiple commands in one shell command-line.
But what you are executing are not shell commands. Those are WLST commands, right? So you have to feed them to WLST.
Like this:
Channel channel = session.openChannel("exec");
((ChannelExec) channel).setCommand("java -cp /.../weblogic.jar weblogic.WLST");
OutputStream out = channel.getOutputStream();
channel.connect();
out.write(("connect('weblogic'...)\n").getBytes());
out.write(("domainRuntime()\n").getBytes());
...
It's basically the same as generic Providing input/subcommands to command executed over SSH with JSch.

Related

Unable to access the cmd prompt in remote machine using openchannel in java

I'm trying to access the cmd prompt in administrator mode and run a batch file in the remote machine,but right now I'm not able to access the cmd prompt through openchannel. Did anybody tried to access it from remote machine in java?
Here is the code
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
JSch jsch = new JSch();
session = jsch.getSession(user, ip, 22);
session.setPassword(password);
session.setTimeout(timeOut);
session.setConfig(config);
session.connect();
System.out.println("session connected");
//open command prompt to run the command = "C:\\executeBatchFile.bat" file
Channel channel = (ChannelExec) session.openChannel("exec");
((ChannelExec)channel).setCommand("cmd.exe /c \"echo %cd%\"\\executeBatchFile.bat");
channel.connect();
InputStream outputstream_from_the_channel = channel.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(outputstream_from_the_channel));
String jarOutput;
while ((jarOutput = reader.readLine()) != null)
{
System.out.println("Inside while loop");
System.out.println(jarOutput + "\n");
}
reader.close();
session.disconnect();
Expected behavior :set command should run as an administrator(though I have logged in as admin),come back to the c:drive (cd) and execute the batch file ie; C:executeBatchFile.bat
Actual behaviour : command gives the user path(not as admin) when I print the jarOutput. ie; C:\Users\Admin\executeBatchFile.bat
could you suggest any solution on the same?
This has been resolved using PsExec command instead of JSCH
String pscommand=E:\\Tool\\psexec -u user -p pwd \\\\ip -s -d cmd.exe /c C:\\executescript.bat
process = Runtime.getRuntime().exec(pscommand);
InputStream es = process.getErrorStream();
BufferedReader errReader = new BufferedReader(new InputStreamReader(es));
String line;
// Read STDOUT into a buffer.
while ((line = errReader.readLine()) != null)
{
system.out.println(line);
}
Could any one tell me how to open the cmd prompt in administrator mode(I logged in using admin credentials only but still it does not open in admin mode).Here I need to run the script in administrator.

scp using Jsch to copy file asking for password

I am trying to copy files from one remote server to another remote. I tried to use scp. It's copying the files through putty but not through the code. I am currently using echo to copy the files. With echo I am writing a string finalStr to abc.bcc its working fine. But when using below command in Jsch its not working.
scp /home/abc.bcc user#host:/folder1/folder2/abc.bcc
I tried adding ssh public private keys but no luck. I tried with channel.setPty(true) to avoid password prompt and setting the password through bufferedWriter. But still unable to copy the files. Please suggest what needs to be changed.
JSch jsch = new JSch();
Session session;
try {
session = jsch.getSession("user", "host", 22);
session.setPassword("password");
session.setConfig("PreferredAuthentications", "publickey,keyboard-interactive,password");
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
logger.info("Connection status: " + session.isConnected());
Channel channel = session.openChannel("exec");
((ChannelExec) channel).setCommand(
"echo \"" + finalStr + "\" >> /folder1/folder2/abc.bcc");
((ChannelExec) channel).setPty(false);
channel.setInputStream(null);
((ChannelExec) channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
OutputStream out = channel.getOutputStream();
channel.connect();
logger.info("Channel status : " + channel.isConnected());
out.write("\n".getBytes());
out.flush();
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String line;
int index = 0;
while ((line = br.readLine()) != null) {
logger.info(++index + " : " + line);
}
channel.disconnect();
session.disconnect();
}catch(....
Debug output:
debug1: Trying private key: /home/build_path/.ssh/id1
debug3: no such identity: /home/build_path/.ssh/id1: No such file or directory
debug1: Trying private key: /home/build_path/.ssh/id2
debug3: no such identity: /home/build_path/.ssh/id2: No such file or directory
debug1: Trying private key: /home/build_path/.ssh/id3
debug3: no such identity: /home/build_path/.ssh/id_3: No such file or directory
The log looks like user home is not set correctly! So it doesnt find the key files!
General approach:
get the ssh to work without the code.
to copy from one remote to another requires the hostnames and connections to be resolved on both remotes for each other. so login to one remote and try the ssh connection from there directly to the other remote. This is not guaranteed to work.
I am pretty sure once you have this resolved you get everything else working.
When proxies are involved this can get quite complicated as the proxy settings have to work correctly between all 3 machines.
I am facing those issues repeatedly and it can be very messy.

Unix commands become, cd and ls -la to be run via java code

I am supposed to connect to a Unix server, then go to the specific folder(which has got access restrictions) and fetch the file details from there. For the same , the code that I have written is
try{
Session session = new JSch().getSession("username", "host");
session.setPassword("password");
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
Channel channel=session.openChannel("exec");
((ChannelExec)channel).setCommand("cd a/b/node01/c.ear && ls -la");
channel.connect();
channel.run();
InputStream in = channel.getInputStream();
System.out.println(channel.isConnected());
byte[] tmp = new byte[1024];
while (true)
{
while (in.available() > 0)
{
int i = in.read(tmp, 0, 1024);
if (i < 0)
break;
System.out.print(new String(tmp, 0, i));
}
if (channel.isClosed())
{
System.out.println("exit-status: " + channel.getExitStatus());
break;
}
}
channel.disconnect();
session.disconnect();
}
catch(Exception exception){
System.out.println("Got exception "+exception);
}
I am not getting the list of files that are present in the location supplied.
The output that I am getting is
true
exit-status: 1
How do I get the desired output?
Do not use shell commands to retrieve file information. Use SFTP!
Channel channel = session.openChannel("sftp");
channel.connect();
ChannelSftp c = (ChannelSftp)channel;
java.util.Vector vv = c.ls("/a/b/node01/c.ear");
for (int i = 0; i < vv.size(); i++)
{
System.out.println(vv.elementAt(i).toString());
}
See http://www.jcraft.com/jsch/examples/Sftp.java.html
Regarding your code for "exec" channel:
First, the code has a recurring flaw described in:
Randomly getting empty output while executing shell command via JSch.
Though to actually debug your problem, you have to read both stdout and stderr to collect any errors (which you are obviously getting).
For that see Log stdout and stderr from ssh command in the same order it was created.
A possible problem here is the usage of in.available(). It returns the number of bytes that can be read without blocking.
The correct way to read a stream until eof is:
byte[] buf = new byte[1024];
int len;
while ((len=in.read(buf)) >= 0) {
// do something with buf[0 .. len]
}

JSch executing more than one linux command at once

My aim is to connect to my linux server using a java application and execute a linux command. I have already achieved this using the JSch API but I can't seem to figure out how to execute more than one command at a time.
It's a problem for me because I need to navigate to a certain directory, then execute another command FROM that directory. My application just exits before the second command can be executed in the correct directory.
Here is my method to execute one linux command as a string when it is passed as a parameter and print any output.
public void connect(String command1){
try {
JSch jsch = new JSch();
Session session = jsch.getSession(user, host, port);
session.setPassword(password);
session.setConfig("StrictHostKeyChecking", "no");
session.connect();
System.out.println("Connected");
Channel channel = session.openChannel("exec");
((ChannelExec)channel).setCommand(command1);
channel.setInputStream(null);
((ChannelExec)channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
channel.connect();
byte[] tmp = new byte[1024];
while(true){
while(in.available()>0){
int i=in.read(tmp, 0, 1024);
if(i<0)break;
System.out.print(new String(tmp, 0, i));
}
if(channel.isClosed()){
System.out.println("exit-status: "+channel.getExitStatus());
break;
}
try {
Thread.sleep(1000);
}
catch(Exception ee){
ee.printStackTrace();
}
}
channel.disconnect();
session.disconnect();
System.out.println("DONE");
}
catch(Exception e){
e.printStackTrace();
}
}
Any ideas how to do 2 commands at once?
If a normal shell is started on the remote machine, use ; or && constructs to do more things.
As in
cd /home/foo/banana ; do_things
or
cd /home/foo/banan && do_things #do_things will only be run if the cd command is successfull

JSch : channel never closed or EOF

I am new to JSch and I have a problem with some of my script I try to execute remotely and which seems to never end (and does not do the same thing as when I run it using putty).
I have redirected error and output stream to my System.out and see indeed error when the script is executed but the script is finished! Therefore I don't understand why the channel is still open (isClosed and isEOF are false).
When I run the command when connecting in SSH with putty the script execute correctly and does not show any errors. When I do ssh user#host "my command" using ssh command in Ubuntu I get the same output (std + err) as when I use JSch but the ssh command does not hangs!
Do you have any idea of what I do wrong, why does I have different output/behavior? Here is the java code I run (by the way I CAN'T send several command with different channel on the same sessions and I have no idea why, I therefore open one session for each cmd).
public static void runCommand(String user, String password, String cmd) throws JSchException, IOException{
Session session = jSsh.getSession(user, SERVER, SSH_PORT);
session.setPassword(password);
session.setConfig(SSH_PROPERTIES);
session.connect();
SshCommand sshCmd = new SshCommand(session, cmd);
runCommand(sshCmd);
session.disconnect();
}
private static void runCommand(SshCommand sshCmd) throws IOException, JSchException{
Session session = sshCmd.getSshSession();
String cmd = sshCmd.getCmd();
UtilityLogger.log(Level.FINE, "Running command on ssh : "+cmd);
ChannelExec channel = (ChannelExec) session.openChannel("exec");
channel.setCommand(cmd);
channel.setInputStream(null);
InputStream in = channel.getInputStream();
InputStream err = channel.getErrStream();
UtilityLogger.log(Level.FINEST, "Connecting to channel");
channel.connect();
UtilityLogger.log(Level.FINEST, "Channel connected");
byte[] tmp = new byte[1024];
byte[] tmp2 = new byte[1024];
while (true) {
//Flush channel
while (in.available() > 0) {
int i = in.read(tmp, 0, 1024);
if (i < 0)
break;
UtilityLogger.log(Level.FINE, new String(tmp, 0, i));
}
//Flush Error stream
while (err.available() > 0) {
int i = err.read(tmp2, 0, 1024);
if (i < 0)
break;
UtilityLogger.log(Level.FINE, new String(tmp2, 0, i));
}
if(DONT_WAIT_PROCESS_END)
break;
if (channel.isEOF()) {
UtilityLogger.log(Level.FINE, "Channel exit-status: " + channel.getExitStatus());
break;
}
}
try{Thread.sleep(TIME_BETWEEN_COMMAND);}catch(Exception ee){}
channel.disconnect();
UtilityLogger.log(Level.FINEST, "Channel disconnected");
}
Try appending "exit;" after your commands even while using exec channels.
Our app did not receive an EOF on the exec, too. Appending an exit; to the command did not solve the problem.
It had something to do with the stderr output. Redirecting stderr to stdout solved (workarounded?!) the problem.
So we appended 2>&1 to the command:
${command} 2>&1

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