I have a bit of code that creates a salix webapp and runs it from an IDE popup menu by making use of util::Webserver. In order to allow for the command to be used multiple times, I try to shutdown any existing webserver at that address first but it doesn't seem to be working. No matter what it always comes up with an illegal argument error stating "shutdown" not possible.
void run_game(Tree t, loc s){
t = annotate(t);
PSGAME g = ps_implode(t);
Checker c = check_game(g);
Engine engine = compile(c);
loc host = |http://localhost:9050/|;
try { util::Webserver::shutdown(host);} catch: ;
util::Webserver::serve(host, load_app(engine)().callback, asDaemon = true);
println("Serving content at <host>");
}
What I expect to happen is that the first time this function it run, shutdown throws an error that is silenced because no webserver exists and then serve starts the webserver. If the user tries to run the function again then shutdown successfully runs, clearing the address bind and serve binds successfully to the address.
What actually happens the second time, is that shutdown still errors, the error is silenced and then serve complains that the address is already in use.
I'm looking for any solution that would allow me to start a salix app through the IDE's popup menu (previously registered) at the same address.
PS_contributions =
{
PS_style,
popup(
menu(
"PuzzleScript",
[
action("Run Game", run_game)
]
)
)
};
registerContributions(PS_NAME, PS_contributions);
Right; we ran into similar issues and decided to special case actions that run web apps. So we added this:
data Menu = interaction(str label, Content ((&T <: Tree) tree, loc selection) server)
See https://github.com/usethesource/rascal-eclipse/blob/bb70b0f6e8fa6f8c227e117f9d3567a0c2599a54/rascal-eclipse/src/org/rascalmpl/eclipse/library/util/IDE.rsc#L119
Content comes from the Content module which basically wraps any Response(Request) servlet.
So you can wrap your salix webApp in a Content and return it given a current selection and the current tree.
The IDE will take care to start and also shutdown the server. It does that every time an interaction with the same label is created or after 30 minutes of silence on the given HTTP port.
Related
I have a VBA script in Access that logs onto a website and downloads some data, I built it using a laptop and use the code of
Dim objIE As InternetExplorerMedium 'special object variable representing the IE browser
Dim aEle As HTMLLinkElement 'special object variable for an <a> (link) element
Dim element As HTMLLinkElement
Set objIE = New InternetExplorerMedium
On Error GoTo Errorhandler
objIE.Visible = False
DoCmd.Hourglass (True) 'navigate IE to this web page
objIE.navigate www.google.com ' google just for example
Then it inputs the login info into the proper boxes and logs in.
Which works fine, however I installed this front end on another user's PC and it no longer works, it just opens the page but fills in no info.
However, if I change,
Set objIE = New InternetExplorerMedium
to
Set objIE = CreateObject("InternetExplorer.Application")
then it works on their PC. But this change does not work on my laptop.
What would cause this issue and how could I standardize this so I can install on any windows machine without worry of this occurring.
Notes:
We are both on the company LAN, and both are running windows 10 Home.
It was something incredibly simple, I just had to add the website I was accessing as a trusted site in Internet Explorer.
Hi i'm relativly new to kernel programming (i've got a lot of c++ development experience though) and have a goal that i want to achieve:
Detecting and conditionally blocking attempts from userland programs to write or read to specific memory addresses located in my own userland process. This has to be done from a driver.
I've setup a development enviorment (virtual machine running the latest windows 10 + virtualkd + windbg) and already successfully deployed a small kmdf test driver via the visual studio integration (over lan).
So my question is now:
How do i detect/intercept Read/WriteProcessMemory calls to my ring3 application? Simply blocking handles isn't enough here.
It would be nice if some one could point me into the right direction either by linking (a non outdated) example or just by telling me how to do this.
Update:
Read a lot about filter drivers and hooking Windows Apis from kernel mode, but i really dont want to mess with Patchguard and dont really know how to filter RPM calls from userland. Its not important to protect my program from drivers, only from ring3 applications.
Thank you :)
This code from here should do the trick.
OB_PREOP_CALLBACK_STATUS PreCallback(PVOID RegistrationContext,
POB_PRE_OPERATION_INFORMATION OperationInformation)
{
UNREFERENCED_PARAMETER(RegistrationContext);
PEPROCESS OpenedProcess = (PEPROCESS)OperationInformation->Object,
CurrentProcess = PsGetCurrentProcess();
PsLookupProcessByProcessId(ProtectedProcess, &ProtectedProcessProcess); // Getting the PEPROCESS using the PID
PsLookupProcessByProcessId(Lsass, &LsassProcess); // Getting the PEPROCESS using the PID
PsLookupProcessByProcessId(Csrss1, &Csrss1Process); // Getting the PEPROCESS using the PID
PsLookupProcessByProcessId(Csrss2, &Csrss2Process); // Getting the PEPROCESS using the PID
if (OpenedProcess == Csrss1Process) // Making sure to not strip csrss's Handle, will cause BSOD
return OB_PREOP_SUCCESS;
if (OpenedProcess == Csrss2Process) // Making sure to not strip csrss's Handle, will cause BSOD
return OB_PREOP_SUCCESS;
if (OpenedProcess == CurrentProcess) // make sure the driver isnt getting stripped ( even though we have a second check )
return OB_PREOP_SUCCESS;
if (OpenedProcess == ProtectedProcess) // Making sure that the game can open a process handle to itself
return OB_PREOP_SUCCESS;
if (OperationInformation->KernelHandle) // allow drivers to get a handle
return OB_PREOP_SUCCESS;
// PsGetProcessId((PEPROCESS)OperationInformation->Object) equals to the created handle's PID, so if the created Handle equals to the protected process's PID, strip
if (PsGetProcessId((PEPROCESS)OperationInformation->Object) == ProtectedProcess)
{
if (OperationInformation->Operation == OB_OPERATION_HANDLE_CREATE) // striping handle
{
OperationInformation->Parameters->CreateHandleInformation.DesiredAccess = (SYNCHRONIZE | PROCESS_QUERY_LIMITED_INFORMATION);
}
else
{
OperationInformation->Parameters->DuplicateHandleInformation.DesiredAccess = (SYNCHRONIZE | PROCESS_QUERY_LIMITED_INFORMATION);
}
return OB_PREOP_SUCCESS;
}
}
This code, once registered with ObRegisterCallback, will detect when a new handle is created to your protected process and will kill it if it's not coming from Lsass, Csrss, or itself. This is to prevent blue screens from critical process being denied a handle to
your application.
Created a webextension for firefox (currently using Nightly 52), that uses native messaging to launch a java program on Linux (Ubuntu 14, 32x).
The webextension loads, reads the .json file and reads the path which points to a script that starts the java program. The JSON and the path are correct as when I use:
var native = browser.runtime.connectNative("passwordmanager");
console.log("native.name" + native.name); //outputs passwordmanager.
native.onDisconnect.addListener(function(m) { console.log("Disconnected"); });
The above code prints the name of the native port and also prints "Disconnected". So I m guessing the native app is terminating for some reason.
The application is only skeleton right now, that just does sysout and reads sysin and works correctly if Launch it directly through the shell script.
While debugging the webextension, I am not able to step into the call to connectNative, as it just steps-over that call instead of doing step-in. So kind of out of options whats' going wrong.
Please let me know if anyone is able to create a native messaging app based on FF webextension and any pointers on what I might be doing wrong.
Thanks
This solution here shows you how to detect onConnect and onFail. It should help you out to figure out your real problem.
So I don't think you can do proper error handling with connectNative from the JS side alone. You can do somewhat error handling if you get the exe side involved, but you can't get a string for "error reason" when an error occurs. The error is only logged to console.
First make sure to set your deeloper prefs, so messages show in your browser console. You can use this addon - https://addons.mozilla.org/en-US/firefox/addon/devprefs/ - or read that addon description it gives you the MDN page with the prefs to set.
Then this is how you can do some sort of error handling (without error reason) (pseudo-code - i might need a .bind in the callbcks):
function connectNative(aAppName, onConnect, onFail) {
var listener = function(payload) {
if (!connected) {
connected = true;
port.onDisconnect.removeListener(failedConnect);
onConnect();
} else {
// process messages
}
}
var failedConnect = function() {
onFail('failed for unattainable reason - however see browser console as it got logged there');
}
var connected = false;
var port = chrome.runtime.connectNative(aAppName);
port.onMessage.addListener(listener);
port.onDisconnect.addListener(failedConnect);
return port;
}
Now in your exe, as soon as it starts up, make it write to stdout something. That will trigger the onConnect.
I'm trying to stop a Windows service on a local machine (the service is Topshelf.Host, if that matters) with this code:
serviceController.Stop();
serviceController.WaitForStatus(ServiceControllerStatus.Stopped, timeout);
timeout is set to 1 hour, but service never actually gets stopped. Strange thing with it is that from within Services MMC snap-in I see it in "Stopping" state first, but after a while it reverts back to "Started". However, when I try to stop it manually, an error occurs:
Windows could not stop the Topshelf.Host service on Local Computer.
Error 1061: The service cannot accept control messages at this time.
Am I missing something here?
I know I am quite late to answer this but I faced a similar issue , i.e., the error: "The service cannot accept control messages at this time." and would like to add this as a reference for others.
You can try killing this service using powershell (run powershell as administrator):
#Get the PID of the required service with the help of the service name, say, service name.
$ServicePID = (get-wmiobject win32_service | where { $_.name -eq 'service name'}).processID
#Now with this PID, you can kill the service
taskkill /f /pid $ServicePID
Either your service is busy processing some big operation or is in transition to change the state. hence is not able to accept anymore input...just think of it as taking more than it can chew...
if you are sure that you haven't fed anything big to it, just go to task manager and kill the process for this service or restart your machine.
I had exact same problem with Topshelf hosted service. Cause was long service start time, more than 20 seconds. This left service in state where it was unable to process further requests.
I was able to reproduce problem only when service was started from command line (net start my_service).
Proper initialization for Topshelf service with long star time is following:
namespace Example.My.Service
{
using System;
using System.Threading.Tasks;
using Topshelf;
internal class Program
{
public static void Main()
{
HostFactory.Run(
x =>
{
x.Service<MyService>(
s =>
{
MyService testServerService = null;
s.ConstructUsing(name => testServerService = new MyService());
s.WhenStarted(service => service.Start());
s.WhenStopped(service => service.Stop());
s.AfterStartingService(
context =>
{
if (testServerService == null)
{
throw new InvalidOperationException("Service not created yet.");
}
testServerService.AfterStart(context);
});
});
x.SetServiceName("my_service");
});
}
}
public sealed class MyService
{
private Task starting;
public void Start()
{
this.starting = Task.Run(() => InitializeService());
}
private void InitializeService()
{
// TODO: Provide service initialization code.
}
[CLSCompliant(false)]
public void AfterStart(HostControl hostStartedContext)
{
if (hostStartedContext == null)
{
throw new ArgumentNullException(nameof(hostStartedContext));
}
if (this.starting == null)
{
throw new InvalidOperationException("Service start was not initiated.");
}
while (!this.starting.Wait(TimeSpan.FromSeconds(7)))
{
hostStartedContext.RequestAdditionalTime(TimeSpan.FromSeconds(10));
}
}
public void Stop()
{
// TODO: Provide service shutdown code.
}
}
}
I've seen this issue as well, specifically when a service is start pending and I send it a stop programmatically which succeeds but does nothing. Also sometimes I see stop commands to a running service fail with this same exception but then still actually stop the service. I don't think the API can be trusted to do what it says. This error message explanation is quite helpful...
http://technet.microsoft.com/en-us/library/cc962384.aspx
I run into a similar issue and found out it was due to one of the services getting stuck in a state of start-pending, stop pending, or stopped.
Rebooting the server or trying to restart services did not work.
To solve this, I run the Task Manager in the server and in the "Details" tab I located the services that were stuck and killed the process by ending the task. After ending the task I was able to restart services without problem.
In brief:
1. Go to Task Manager
2. Click on "Detail" tab
3. Locate your service
4. Right click on it and stop/kill the process.
That is it.
I know it was opened while ago, but i am bit missing the option with Windows command prompt, so only for sake of completeness
Open Task Manager and find respective process and its PID i.e PID = 111
Eventually you can narrow down the executive file i.e. Image name = notepad.exe
in command prompt use command TASKKILL
example: TASKKILL /F /PID 111 ; TASKKILL /F /IM notepad.exe
I had this exact issue internally when starting and stopping a service using PowerShell (Via Octopus Deploy). The root cause for the service not responding to messages appeared to be related to devs accessing files/folders within the root service install directory via an SMB connection (looking at a config file with notepad/explorer).
If the service gets stuck in that situation then the only option is to kill it and sever the connections using computer management. After that, service was able to be redeployed fine.
May not be the exact root cause, but something we now check for.
I faced the similar issue. This error sometimes occur because the service can no longer accept control messages, this may be due to disk space issues in the server where that particular service's log file is present.
If this occurs, you can consider the below option as well.
Go to the location where the service exe & its log file is located.
Free up some space
Kill the service's process via Task manager
Start the service.
I just fought this problem while moving code from an old multi partition box to a newer single partition box. On service stop I was writing to D: and since it didn't exist anymore I got a 1061 error. Any long operation during the OnStop will cause this though unless you spin the call off to another thread with a callback delegate.
I have a Windows Service that I inherited from a departed developer. The Windows Service is running just fine in the QA environment. When I install the service and run it locally, I receive this error:
Service cannot be started. System.InvalidOperationException: The requested Performance Counter is not a custom counter, it has to be initialized as ReadOnly.
Here is the code:
ExternalDataExchangeService exchangeService = new ExternalDataExchangeService();
workflowRuntime.AddService(exchangeService);
workflowRuntime.AddService(new SqlTrackingService(AppContext.SqlConnectionImportLog));
ChallengerWorkflowService challengerWorkflowService = new ChallengerWorkflowService();
challengerWorkflowService.SendDataEvent += new EventHandler<SendDataEventArgs>(challengerWorkflowService_SendDataEvent);
workflowRuntime.AddService(challengerWorkflowService);
workflowRuntime.StartRuntime(); <---- Exception is thrown here.
Check for installer code. Often you will find counters are created within an installation (which is going to of been run under admin privledges on client site) and the code then uses them as though they exist - but will not try create them because they do not expect to have the permissions.
If you just get the source and then try run it, the counters / counter classes do not exist so you fall over immediately. (Alternatively check whether the counter exists / you have local admin if they wrote the code to create it in the service.)
Seen it before so mentioned it.
Attach Debugger and break on InvalidOperationException (first-chance, i.e. when thrown)?