I am using Jmeter 3.2 and I need to do a telnet connection and parse the response.
Is it possible using Jmeter 3.2 or adding any plugin?
What I need to achieve is what I would do using this command line
telnet
open [IP] [PORT]
and understand if the connection is established or not.
Also I wonder what is the effective difference if I simply use a TCP Sampler.
Thanks
Given you have groovy tag here's how you can test the connectivity using Socket class, the example code would be something like:
def sock = new Socket()
sock.setSoTimeout(1000)
sock.connect(new InetSocketAddress("example.com",80))
if (sock.isConnected()) {
log.info('Connection established')
}
else {
log.info('Server is not listening')
}
Also be aware that you can invoke telnet command directly using String.execute() method like:
"telnet example.com 80".execute().text
And last but not the least, you can run an arbitrary command or program using JMeter's OS Process Sampler.
Related
I am trying to make a connection from a server running Ubuntu to a Beckhoff PLC with TwinCAT 3. With Windows everything works fine but with the same server on Linux I can't get a connection.
The Linux server has a static IP and in the route manager in the PLC I can find the route and see the server. I have tried adding the route by the route manager in the PLC and with "add_route_to_plc" but both ways my connection is refused. I have already turned off all firewalls. Any of you guys any idea what goes wrong here? In the attachment I have added some picture to see my settings and code that I try to run.
Python error: "connection closed by remote"
Python code:
import pyads
SENDER_AMS = '192.168.1.180.1.1'
PLC_IP = '192.168.1.100'
PLC_USERNAME = 'Administrator'
PLC_PASSWORD = '1'
ROUTE_NAME = 'GID_TEST_ROUTE'
HOSTNAME = 'Grid-stabilizer'
pyads.open_port()
pyads.set_local_address(SENDER_AMS)
pyads.add_route_to_plc(SENDER_AMS, HOSTNAME, PLC_IP, PLC_USERNAME, PLC_PASSWORD, route_name=ROUTE_NAME)
pyads.close_port()
plc=pyads.Connection('192.168.1.100.1.1', pyads.PORT_TC3PLC1)
plc.open()
plc.read_state()
If you are running python on linux and the plc on windows try
plc=pyads.Connection('192.168.1.100.1.1', pyads.PORT_TC3PLC1, PLC_IP)
This will create a route on the linux system. In your code the ip is missing to create a proper route.
Check the port of your plc. It should be 851.
I had followed the steps given in https://docs.datastax.com/en/developer/python-driver/3.25/getting_started/ to connect to cassandra database using python code, but still after running the code snippet I am getting
NoHostAvailable: ('Unable to connect to any servers', {'hosts"port': OperationTimedOut('errors=None, last_host=None'),
Python version 2.7 and 3 (classpath is set for both the python versions)
Java 1.8 (class path has been set)
Apache cassandra 3.11.6 (apache home classpath has been set)
I tend to use a very simple app to test connectivity to a Cassandra cluster:
from cassandra.cluster import Cluster
cluster = Cluster(['10.1.2.3'], port=45678)
session = cluster.connect()
row = session.execute("SELECT release_version FROM system.local").one()
if row:
print(row[0])
Then run it:
$ python HelloCassandra.py
4.0.6
In your comment you mentioned that you're getting OperationTimedOut which indicates that the driver never got a response back from the node within the client timeout period. This usually means (a) you're connecting to the wrong IP, (b) you're connecting to the wrong CQL port, or (c) there's a network connectivity issue between your app and the cluster.
Make sure that you're using the IP address that you've set in rpc_address of cassandra.yaml. Also make sure that the node is listening for CQL clients on the right port. You can easily verify this by checking the output of either of these Linux utilities like netstat or lsof, for example:
$ sudo lsof -nPi -sTCP:LISTEN
Cheers!
So that error message suggests that the host/port combination either does not have Cassandra running on it or is under heavy load and unable to respond.
Can you edit your question to include the Cassandra connection portion of your code, as well as maybe how you're calling it? I have a test script which I use (and you're welcome to check it out), and here is the connection portion:
protocol=4
hostname=sys.argv[1]
username=sys.argv[2]
password=sys.argv[3]
nodes = []
nodes.append(hostname)
auth_provider = PlainTextAuthProvider(username=username, password=password)
cluster = Cluster(nodes,auth_provider=auth_provider, protocol_version=protocol)
session = cluster.connect()
I call it like this:
$ python3 testCassandra.py 127.0.0.1 aaron notReallyMyPassword
local
One thing you might try too, would be to run a nodetool status on the cluster just to make sure it's running ok.
Edit
local variable 'session' referenced before assignment
So this sounds to me like you're attempting a session.execute before session = cluster.connect(). Have a look at my Git repo (linked above) to see the correct order for instantiating session.
I am not using default port
In that case, make sure the port is being set in the cluster definition. Ex:
port = 19099
cluster = Cluster(nodes,auth_provider=auth_provider, port=port)
When using selenium-webdriver, something attempts to bind to a port, listening for connections from the unspecified IPv6/IPv4 host (:: / 0.0.0.0). This triggers a firewall message.
I'd like to avoid this firewall message by forcing whatever this is to bind only to localhost, but I can't find any clues about what this server is or how to configure it.
Example code which replicates the issue:
const webdriver = require('selenium-webdriver');
const driver = new webdriver.Builder().forBrowser('chrome').build();
setTimeout(() => {
driver.quit();
}, 10000);
On macOS, this shows the prompt:
Do you want the application “node” to accept incoming network connections?
Obviously choosing "deny" still allows the tests to run (since everything is local anyway), and after selecting this option the OS remembers the choice until Node is updated, but I'd like to lock-down the test so that this isn't an issue.
What is causing this? How can I configure it?
You can use Selenium Standalone Server and bind it to a specific IP address. Additionally you can disable IPv6 addresses lookup.
Launch Selenium Standalone Server like:
java -Djava.net.preferIPv4Stack=true -jar selenium-server-standalone-x.xx.x.jar -host 10.20.30.40
Amend your webdriver initialization code to explicitly set the Selenium Server address like:
const driver = new webdriver.Builder().forBrowser('chrome').usingServer('http://10.20.30.40:4444/wd/hub').build();
replace this 10.20.30.40 with the IP address of your choice (the IP address or alias must exist on the system where you run the test)
References:
Selenium with JavaScript - The Standalone Selenium Server
Connecting Selenium Hubs to Cloud Server
Hi All,
I want to create a JSP page where I will ask user to give the source host and port and also destination host and port.
Following combination of source and destination OS is possible
Unix->Unix/Windows/zOS Windows-> Unix/Windows/zOS zOS ->
Unix/Windows/zOS
With these inputs I want to connect to the source server and fire this command telnet $ip $port to the destination. If the telnet connectivity is successful it should return success and else error.
I want to create the logic non-interactive that it should not require any password to login the source for checking telnet connectivity.
Is there any such library or any mechanism available so that I could make this feasible?
Why not use Apache Commons Net?
TelnetClient telnet = new TelnetClient();
try {
telnet.connect("rainmaker.wunderground.com", 3000);
} catch(IOException e) {
// failed
} finally {
telnet.disconnect();
}
I want to have a shell access over http to interact with a program running on my server (as opposed to SSH and other protocol). I have done some research and found two main ways, the php way such as http://sourceforge.net/projects/phpterm/ and the CGI way. Although these result in shell-like terminals over http, I can't interact with programs with standard input/output without passing paramaters at run: ./prog -options etc..
With a standard shell over netcat for example ./prog would provide full interaction so that it could prompt for input etc..
The test program I am running is:
#include<stdio.h>
#include<sys/types.h>
include<stdlib.h>
int main ()
{
// set up keyword(passcode)
char this[14];
char that[128];
// check the password and exit if it doesn't match;
fgets(this, 14, stdin);
if (strncmp(this, "passwd\n", 14)) {
exit(0);
}
printf("shell interaction success! \n");
fgets(that, 128, stdin);
system(that);
exit(0);
}
If run from netcat this would occur:
./prog
passwd
Shell interaction success
If run from other shell like solutions over http I have come accrss:
./prog
then nothing.
Fingers crossed someone knows how!
You could do this, but since HTTP is a connectionless request-response protocol, it wouldn't use just one HTTP connection.
A browser would make a request to start a shell on the remote server
A backend service would be started that creates the desired process and captures the stdin/stdout pipes
Javascript on the browser would send (POST perhaps) a request to the server to say "this user typed some character"
Some kind of AJAX request polling loop would get new output from the backend process and display it on the browser
Or, this could be considerably simplified using WebSockets which is a stream protocol (and is implemented by some browsers but is not HTTP).