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• Is a VPN a good method for protecting data in an untrusted network? [closed]

  - by john

  I will be connecting my laptop in an untrusted network. If I setup OpenVpn on a server and use a vpn client on the laptop to connect through it, is it enough? Can someone perform a MITM attack or otherwise eavesdrop on my traffic? If someone on the local network port-scans my laptop, will the open ports be accessible to him while I use the VPN tunnel? Is there anything else I should keep in mind?

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• How do I set a password for proftpd on Mac?

  - by chaddjohnson

  I installed proftpd on my mac using "port install proftpd". Now, when I try to connect via my ftp client, it says that the login is incorrect. How do I fix this?

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• What is the best way/tool to analyze raw data(network stats) from Simulation?

  - by user90500

  After running a simulation(using a simulator(QualNet)) of a simulated network I end up with ip stats stored in a database, I then extract the data to a csv file So now I have 750mb of raw network stats(time stamp, packet id, source ip, source port, protocol, etc). What are the common ways of analyzing large amounts of data like above, if you want to know things like packet loss, throughput, delay, congestion, etc.

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• Functions connected to signals in QtScript (on Qt 4.5.2) are not firing

  - by Cody Brocious

  I've injected into a proprietary Qt (4.5.2) application, added my own compatible build of QtScript, and have managed to get access to all the signals I need. However, when connecting to them (via QtScript) my functions are never called. I've come up with a few theories for why this is and I've tested everything I can think of, but I've hit a bit of a wall. Note, I've never had any connection exceptions whatsoever. Here are my current theories: The signals I'm connecting to are already connected to other slots, and that's somehow blocking it (but as far as I know, all Qt signals fire to all slots with no extra work, and can't be restricted in this way) The signals are rejecting my connection, or disconnecting me after connection (but I see no facility for this) My connection is happening from another thread, and this is somehow causing it not to connect properly Are any of these theories plausible? If not, what have I missed?

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• Android AVD With GoogleApi, Not Getting Network Connection

  - by Chris

  I am working on a Windows XP Machine. When running AVDs out of Eclipse, I am getting "No Network Connection" when I am plugged into my company's network and using an AVD that was built with the "Google APIs by Google Inc., Android API 7, revision 1". If I use this same AVD (Google API) and connect to the internet through a Verizon Wireless card, the AVD gets an Internet Connection. If I use an AVD built with "SDK Platform Android 2.1, API 7, revision 1", and connect through my company's network, the AVD gets an Internet Connection. Any ideas what might be blocking this? I am guessing it is something in my company's network, but why only with the AVD created with the Google API?

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• Creating an independent draw thread using pthreads (C++)

  - by sagekilla

  Hi all, I'm working on a graphical application which looks something like this: while (Simulator.simulating) { Simulator.update(); InputManager.processInput(); VideoManager.draw(); } I do this several times a second, and in the vast majority of cases my computation will be taking up 90 - 99% of my processing time. What I would like to do is take out the processInput and draw functions and have each one run independently. That way, I can have the input thread always checking for input (at a reasonable rate), and the draw thread attempting to redraw at a given frame rate. My issue is I'm not sure how I can properly do this. How would I properly initialize my pthread_t and associated pthread_attr_t so that the thread runs without blocking what I'm doing? Any help or even a link is appreciated, thanks!

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• Deciding between Apache Commons exec or ProcessBuilder

  - by Moev4

  I am trying to decide as to whether to use ProcessBuilder or Commons exec, My requirements are that I am simply trying to create a daemon process whose stdout/stdin/stderr I do not care about. In addition I want to execute a kill to destroy this process when the time comes. I am using Java on Linux. I know that both have their pains and pitfalls (such as being sure to use separate thread to swallow streams can lead to blocking or deadlocks, and closing the streams so not to leave open files hanging around)and wanted to know if anyone had suggestions one way or the other as well as any good resources to follow.

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• How to write Asynchronous LINQ query?

  - by Morgan Cheng

  After I read a bunch of LINQ related stuff, I suddenly realized that no articles introduce how to write asynchronous LINQ query. Suppose we use LINQ to SQL, below statement is clear. However, if the SQL database responds slowly, then the thread using this block of code would be hindered. var result = from item in Products where item.Price > 3 select item.Name; foreach (var name in result) { Console.WriteLine(name); } Seems that current LINQ query spec doesn't provide support to this. Is there any way to do asynchronous programming LINQ? It works like there is a callback notification when results are ready to use without any blocking delay on I/O.

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• $.Post with Form submit

  - by Michael

  ...Some form gets submitted... $.("form").submit(function() { saveFormValues($(this), "./../.."; } function saveFormValues(form, path) { var inputs = getFormData(form); var params = createAction("saveFormData", inputs); var url = path + "/scripts/sessions.php"; $.post(url, params); } The weird thing is that if i add a function to the $.post(url, params, function(data) { alert(data); } I get a blank alert statement. Within scripts/sessions.php i have a function to save whatever the $_POST information is to a file, and the sessions.php never saves this saveFormValues call. It never shows up to the file. But if i keep trying to get it to save, about once every 15 will actually allow it to be saved. This leads me to believe that the forms POST is somehow blocking this value saving post. Any help?

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• Linq to SQl over WCF Timesout after several calls

  - by Redeemed1

  I have a L2S Repository class which instantiates the L2S DataContext in its constructor. The repository is instantiated at run time (using Unity) in a service hosted in IIS with WCF. When I run up the client MVC applicaton the calls to the backend WCF service work for a while and then timeout. I suspected perhaps a database issue as I was depending on IIS garbage collection to dispose of unused DataContext instances in the IIS host but when I checked the characteristics of the problem I notice the following: The client makes the call to WCF but the WCF service does not respond. Next, the client times out Some time later (several minutes) the service actually executes the request by instantiating the repository and servicing the call. I have checked both client and server traces logs and only the client shows WCF errors (the timeout error). Where should I look? Is it something in WCF or is L2S possibly blocking with unfreed conenctions, resources etc.? Many thanks Brian

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• Named pipe is not flushing in Python

  - by BrainCore

  I have a named pipe created via the os.mkfifo() command. I have two different Python processes accessing this named pipe, process A is reading, and process B is writing. Process A uses the select function to determine when there is data available in the fifo/pipe. Despite the fact that process B flushes after each write call, process A's select function does not always return (it keeps blocking as if there is no new data). After looking into this issue extensively, I finally just programmed process B to add 5KB of garbage writes before and after my real call, and likewise process A is programmed to ignore those 5KB. Now everything works fine, and select is always returning appropriately. I came to this hack-ish solution by noticing that process A's select would return if process B were to be killed (after it was writing and flushing, it would sleep on a read pipe). Is there a problem with flush in Python for named pipes?

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• A checklist for fixing .NET applications to SQL Server timeout problems and improve execution time

  - by avgbody

  A checklist for improving execution time between .NET code and SQL Server. Anything from the basic to weird solutions is appreciated. Code: Change default timeout in command and connection by avgbody. Use stored procedure calls instead of inline sql statement by avgbody. Look for blocking/locking using Activity monitor by Jay Shepherd. SQL Server: Watch out for parameter sniffing in stored procedures by AlexCuse. Beware of dynamically growing the database by Martin Clarke. Use Profiler to find any queries/stored procedures taking longer then 100 milliseconds by BradO. Increase transaction timeout by avgbody. Convert dynamic stored procedures into static ones by avgbody. Check how busy the server is by Jay Shepherd.

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• Installing sSMTP from SSH

  - by James

  I'm on a Web Hosting Buzz reseller account. They have some very stringent mail sending rules, including blocking of authenticated SMTP socket mail sending using PEAR. It was suggested in WHB forum that this was possible with sSMTP. I've since gotten SSH access and googled how to install sSMTP from SSH: rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm yum install ssmtp However, the first line fails with: Retrieving http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm error: skipping http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm - transfer failed - Unknown or unexpected error It was a very old thread in WHB forum and the thread poster could not be reached for assistance. Any help would be much appreciated!

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• C# How to communicate between 2 servers

  - by Chau

  I have a website running ASP.NET (C#) on server A. I need my website to access a webservice on server B. server B will only accept incoming requests if the requestee is located within a certain IP range and server A is not within this range. I have a server server C which is located within the IP range and the only thing blocking server A from server C is a firewall (which I have access to). It must be possible to create a hole in the firewall between server A and server C, but my question is: How do I relay the request from server A to server B via server C? I need the response from server B to get back to server A also :) Thanks in advance.

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• jquery-Ajax call on tornado handlers waits for pervious ajax call to return

  - by harshh

  Hey All. I recently started testing TornadoWeb for a home-project, which uses jquery getJSON function to call my tornado handlers. And found something strange, which i seek an explanation for. I fire an ajax request for Handler1 on tornado, and in some cases request for Handler2 is initiated before Handler1 returns. It appears from development-server logs, and firebug console-debugging, that Handler2 request waits for Handler1 request to finish, and then return. So basically, XHR call is waiting for earlier XHRs. They are supposed to be asynchronous/non-blocking right?? Or am i missing something. You can check the test-case environment called testtornado at http://github.com/harshh/Harsh-Projects/ with main.py as server triggering file. I would appreciate help from anyone who can throw some light on this.

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• serving large file using select, epoll or kqueue

  - by xask

  Nginx uses epoll, or other multiplexing techniques(select) for its handling multiple clients, i.e it does not spawn a new thread for every request unlike apache. I tried to replicate the same in my own test program using select. I could accept connections from multiple client by creating a non-blocking socket and using select to decide which client to serve. My program would simply echo their data back to them .It works fine for small data transfers (some bytes per client) The problem occurs when I need to send a large file over a connection to the client. Since i have only one thread to serve all client till the time I am finished reading the file and writing it over to the socket i cannot resume serving other client. Is there a known solution to this problem, or is it best to create a thread for every such request ?

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• How to determine if a file will be logically moved or physically moved.

  - by Frederic Morin

  The facts: When a file is moved, there's two possibilities: The source and destination file are on the same partition and only the file system index is updated The source and destination are on two different file system and the file need to be moved byte per byte. (aka copy on move) The question: How can I determine if a file will be either logically or physically moved ? I'm transferring large files (700+ megs) and would adopt a different behaviors for each situation. Edit: I've already coded a moving file dialog with a worker thread that perform the blocking io call to copy the file a meg at a time. It provide information to the user like rough estimate of the remaining time and transfer rate. The problem is: how do I know if the file can be moved logically before trying to move it physically ?

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• I need to block my feed completly

  - by justjoe

  i'm in need a solution via coding. on how to completely hide my blog feed. I know how to optimize related hook and filter such as 'the_excerpt_rss' and 'the_post_rss'. And also understand how to limit access or make my blog private. so, the question is more about howto blocking feed access without make my blog private ? i hope the solution will be not some apache .htacceess. Cause i need to code it directly into my theme.. sorry if this's too much to asked.

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• Boost::Asio : io_service.run() vs poll() or how do I integrate boost::asio in mainloop

  - by user300713

  Hi, I am currently trying to use boost::asio for some simple tcp networking for the first time, and I allready came across something I am not really sure how to deal with. As far as I understand io_service.run() method is basically a loop which runs until there is nothing more left to do, which means it will run until I release my little server object. Since I allready got some sort of mainloop set up, I would rather like tp update the networking loop manually from there just for the sake of simplicity, and I think io_service.poll() would do what I want, sort of like this: void myApplication::update() { myIoService.poll(); //do other stuff } This seems to work, but I am still wondering if there is a drawback from this method since that does not seem to be the common way to deal with boost::asios io services. Is this a valid approach or should I rather use io_service.run() in a non blocking extra thread?

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• OpenLayers, Layers: Tiled vs. single tile

  - by Chau

  Each time we add a new layer to our OpenLayers based website (data provided primarily by a GeoServer server), we discuss whether to use a single-tile or a tiled approach. Some of the parameters we evaluate are the following: Using the tiled approach we get: Slow but continuous buildup of the viewport Lots of small images Client side caching possibilities Blocking of the loading pipeline (6 requests at a time) Jerky feeling when navigating during load Using the single-tile approach we get: Smoother feeling when navigating during load Time delay before layer is loaded One large image for each layer No caching of the single tile We have a lot of data editing in the layers, thus a tile-cache might not be that efficient. Are there any best-practices when it comes to tiling? Progressing towards infinitely fast hardware and unlimited data connections, the discussion becomes irrelevant, but what configuration do you percieve as the most user-pleasing?

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• Does the Microsoft SQL Server native client support IDBAsynchNotify?

  - by Aaron Klotz

  I'm working on some OLE DB code that runs queries on MS SQL Server via ICommand::Execute. I'm converting this code to operate asynchronously by setting the DBPROPVAL_ASYNCH_INITIALIZE property on the command before executing. I'd prefer to register a IDBAsynchNotify sink so that my code can be notified of events, as opposed to polling or blocking via ISSAsynchStatus. The documentation for ICommand::Execute does not show IConnectionPointContainer as an acceptable riid parameter, but the same document, when discussing the DB_S_ASYNCHRONOUS return code, suggests that it is possible to request an IConnectionPointContainer interface that I could use to register my event sink. When I call ICommand::Execute, passing IID_IConnectionPointContainer as the riid parameter, I receive the E_NOINTERFACE error. I also tried setting the DBPROP_IConnectionPointContainer property before Execute but I received the same results. If I have to, I'll use ISSAsynchStatus, but I'd much rather use IDBAsynchNotify. Is it possible?

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• Workflow foundation 4.0 message correlation and error reporting

  - by Lygpt

  I have a workflow service that runs and performs a number of different operations (such as web service calls). If one of these operations fails I call an error reporting web service to notify a seperate system that one of my workflow operations has failed. As the error could be something like the web service being down, I loop and retry this operation until it works. There can be times though when the data I'm passing to this web service is faulty and it needs changing. So I need to be able to hook into this running (but delayed) workflow and change local workflow variables and then re-run the operation. I've looked at message correlation in workflow 4.0 to achieve this but because the delay activity is active in my running workflow instance, any second service call doesn't do anything (it's like the delay activity is blocking any other requests). I've tried setting 'CanCreateInstance' to both true and false but it doesn't help. Thanks!

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• TIBRV: Remote vs Local RVD

  - by jsw

  When connected to a local RVD a sending application is shielded from network interruptions and the send message methods will only block for the time it takes for the message to reach the local RVD process. With remote RVD the sending application is no longer shielded from network interruptions and the send message methods will block for the time it takes to hop across the network to reach the remote RVD process. Is my understanding correct? The documentation is vague regarding remote daemons. I'm mostly concerned with how reliable and performant the send message will be from the perspective of a sending application. Introducing unnecessary blocking on the client side due to sending a message (especially a network hop) is a big no-no in this application. The speed at which the messages reach the consumer is not of the utmost importance. With this in mind is a remote RVD out of the question?

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• Using an XML Catalog with a Java library that uses JAXP internally

  - by Brian Ferris

  I'm using the Apache web service xml rpc library to make requests to an rpc service. Somewhere in that process is a xml document with a DTD reference to http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd, which the library attempts to download when parsing the XML. That download fails with a 503 status code because the w3c is blocking repeated downloads of this largely static document from Java clients. The solution is XML Catalogs to locally cache the DTD. However, while I can find examples of setting an EntityHandler on a JAXP SAXParser instance directly to enable catalog parser support, I don't actually have access to the underlying parser here. It's just being used by the xml rpc library. Is there any way I can set a global property or something that will tell JAXP to use XML catalogs?

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• python urllib2 thread safety

  - by jldupont

  Is urllib2 thread safe? I find that using urllib2.urlopen sometimes results in the thread issuing the call to stop functioning. Yes I have used the timeout option to no avail. Is there a thread safe HTTP GET functionality I could use? NOTE: I am not interested in using Twisted to solve this problem. I have used Twisted in the past and I love it but this time I need a simpler solution. NOTE2: I also tried httplib with the same result (blocking).

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