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• Implement a vpn

  - by jackson

  I want to build an application client(client.exe) - server to do the following: when the clients run it they are thrown in a VPN and they can communicate each other within 1 applicataion. For example : clients run client.exe and they can see each other in LAN ONLY in Starcraft. From what i have read the right type of vpn for this situation is Secured Socket Tunneling Protocol: "Secure socket tunneling protocol, also referred to as SSTP, is by definition an application-layer protocol. It is designed to employ a synchronous communication in a back and forth motion between two programs. It allows many application endpoints over one network connection, between peer nodes, thereby enabling efficient usage of the communication resources that are available to that network. " Question: I don't have experience with networking programming so my question for the ones who have, is this the right approach? PS1: i don't want something done like OpenVpn, i do this as learning exercise. PS2: the application is targeting Windows and i plan to use .NET Thanks for reading the whole story, i am waiting for your replies.

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• How does IPC generate security holes?

  - by Walidix

  How does interprocess communication generate security holes? Examples appreciated.

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• What are all the disadvantages of using files as a means of communicating between two processes?

  - by Manny

  I have legacy code which I need to improve for performance reasons. My application comprises of two executables that need to exchange certain information. In the legacy code, one exe writes to a file ( the file name is passed as an argument to exe) and the second executable first checks if such a file exists; if does not exist checks again and when it finds it, then goes on to read the contents of the file. This way information in transferred between the two executables. The way the code is structured, the second executable is successful on the first try itself. Now I have to clean this code up and was wondering what are the disadvantages of using files as a means of communication rather than some inter-process communication like pipes.Is opening and reading a file more expensive than pipes? Are there any other disadvantages? And how significant do you think would be the performance degradation. The legacy code is run on both windows and linux.

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• Login method Customization using GINA [closed]

  - by netseng

  DUPLICATE:http://stackoverflow.com/questions/523912/login-method-customization-using-gina Hi All, I know it's not easy to find a master in GINA, but my question is most near to Interprocess Communication(IPC), I wrote my custom GINA in unmanaged c++, I included it a method that checks for validity of a fingerprint for the user try to login, this function will call some method in a running system windows service written in c#, the code follows: in GINA, unmanaged c++ if(Fingerprint.Validate(userName,finerprintTemplate) { //perform login } in windows service, C# public class Fingerprint { public static bool Validate(string userName, byte[] finerprintTemplate) { //Preform Some code to validate fingerprintTemplate with userName //and retuen result } } Does anyone know how to do such Communication between GINA and the windows service, or simply between c++ written service and C# written service. Thanks

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• Is AMQP suitable as both an intra and inter-machine software bus?

  - by Bwooce

  I'm trying to get my head around AMQP. It looks great for inter-machine (cluster, LAN, WAN) communication between applications but I'm not sure if it is suitable (in architectural, and current implementation terms) for use as a software bus within one machine. Would it be worth pulling out a current high performance message passing framework to replace it with AMQP, or is this falling into the same trap as RPC by blurring the distinction between local and non-local communication? I'm also wary of the performance impacts of using a WAN technology for intra-machine communications, although this may be more of an implementation concern than architecture. War stories would be appreciated.

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• connecting to a webservice from android - AsyncTask or Service?

  - by football

  I'm writing an android app that will connect to a REST/JSON webservice. Users will be retrieving information, uploading comments, downloading and uploading images etc. I know that I shouldn't keep all this network communication in the Activity/UI thread, as it will cause ANRs. What I'm confused about is whether I should use an AsyncTask or a Service with "manual" threading to accomplish this; With a Service, I'd simply have a public method for each method in the webservice's API. I'd then implement threading within each of these methods. If I used an AsyncTask, I would create a helper class that defined AsyncTasks for each method in the webservice's API. Which method is preferred? Interaction with the webservice will only happen while the user is in the Activity. Once they switch to another application, or exit the program, there is no need for communication with the webservice.

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• Node.js and wss://

  - by CNelson

  I'm looking to start using javascript on the server, most likely with node.js, as well as use websockets to communicate with clients. However, there doesn't seem to be a lot of information about encrypted websocket communication using TLS and the wss:// handler. In fact the only server that I've seen explicitly support wss:// is Kaazing. This TODO is the only reference I've been able to find in the various node implementations. Am I missing something or are the websocket js servers not ready for encrypted communication yet? Another option could be using something like lighttpd or apache to proxy to a node listener, has anyone had success there?

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• Self signed Certificate Based Authentication

  - by Tadi Vijay Kumar

  Hi All.. I have started a project based on Client server communication in java. What i'm doing is client and server have their own self signed certificates. In initial communication both client and server will exchange their certificates. Server has to verify clients certificate and should grant authentication. Where i struck was on what topic server can validate or invalidate a particular client..? I am unable to proceed from here. So please any of you can give brief explanation about it? if possible some Pseudocode in java..?

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• How to create an adhoc network between laptops in java?

  - by Muaz

  Hello, I want to create an adhoc between labtops were they will communicate using wireless communication. I will use java for this but still I do not know how to start.. I think I'll have to use sockets for the connections right? How will a laptop notice other laptops in its local network or the other way around? Do i need a server to handle the communication between laptops? Another thing, how to broadcast a message from one laptop to other laptops in the network? Please reply as soon as you can. Any help will be appreciated. Thanks in advance.

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• .NET WebService IPC - Should it be done to minimise some expensive operations?

  - by Kyle

  I'm looking at a few different approaches to a problem: Client requests work, some stuff gets done, and a result (ok/error) is returned. A .NET web service definitely seems like the way to go, my only issue is that the "stuff" will involve building up and tearing down a session for each request. Does abstracting the "stuff" out to an app (which would keep a single session active, and process the request from the web service) seem like the right way to go? (and if so, what communication method) The work time is negligible, my concern is the hammering the transaction servers in question will probably get if I create/drop a session for each job. Is some form of IPC or socket based communication a feasible solution here? Thoughts/comments/experiences much appreciated. Edit: After a bit more research, it seems like hosting a WCF service in a Windows Service is probably a better way to go...

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• Unresponsive UI when using BeginInvoke

  - by Kazoom

  Bckground I have a networked application written in C#. my server program has a UI and several communication threads, that read from tcp sockets and display messages on controller UI. Communication with each client is done through a seprate thread. When i recieve some stream of messages from one client , the thread for that client writes on UI, which is a richtextbox on a Form. I call SetTextHelper(string text) method of the form. which looks like this private delegate void MyTextUpdateHandler(string text); public void SetTextHelper(string text) { BeginInvoke(new MyTextUpdateHandler(SetText), new object[] { text }); } public setText(string text) { richtext.Text= text; } Question - If i use BeginInvoke my UI is entirely unresponsive when i m writing large stream of data to UI - Invoke solves that problem, but i read that for multi threaded environment where many thereads are sharing same resource Invoke can lead to deadlocks I share the common ichtextbox between around 16 threads - What would be a good desing for my situation?

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• How to integrate an open source C program instead of calling its executable through a system call?

  - by ihamer

  I have an executable (fossil scm) that is being invoked by my program externally through ::CreateProcess windows call. The stdout and stderr are then captured. Since the source code for fossil is available, I would prefer to create a static library out of it and issue calls directly. Currently, communication to fossil is done through the command line parameters, and the communication back is through the process return code, stdout and stderr. Fossil writes to stdout/err through printf and fprintf calls. What is the best way to solve this with minimum alteration of fossil source? Is there a reliable and cross-platform way to intercept stdout/err and send it into a memory buffer?

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• DLL response is too slow in Visual Studio [Resolved]

  - by magsto

  I use a 3rd party DLL in my VB.NET project (VS2005) that responds to slow and give wrong values in debug mode. In run-time mode everything works as expected. I do understand that there are something going on in the debug mode which makes the DLL communication slow. This behavior makes it hard to debug the application correctly. Is there any way to force VS to communicate with the DLL in "run-time" mode during debugging but let the rest of the project be in control of the debugger? I found a setting that resolved my issue: Project Properties Debug Enable Debuggers select "Enable unmanaged code debugging". Now the DLL communication flowed smoothly. The DLL I use is a middleware between my app and a USB device. There is no Debug/Release version of the DLL.

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• Can I use WCF NET.TCP Protocol from Silverlight 4 for a public website ?

  - by pixel3cs

  Does anyone know if the new NET.TCP feature of Silverlight 4 can be used for public websites ? From what I know, in the Silverlight 4 Beta they announced that WCF NET.TCP can only be used for intranet applications. The reason I am asking this is because I want to recode my Silverlight multiplayer chess game (build with SL 3 Sockets support) based on the new SL 4 WCF TCP communication protocol. My Socket implementation is build from scratch and have big issues with thread safe and few unsolvable bugs from my side. I am sure that SL 4 team did a great job and they simplified all hard part for me, letting us, developers, concentrate more on the game code instead on underlying communication layers.

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• How to scan for available networks for Blackberry device from application?

  - by amsiddh

  Hi All, Is there any RIM API available which will help to get the list of available network service or only Wi-Fi networks for a device and set selected network access point for any network communications? Is it possible programmatically to disable the Mobile networks like GPRS, WAP, etc? For Ex: When a application is started it should scan for WiFi connections (even if there are no previous WiFi network access points are set on device) and list the available WiFi connection. Then user will select the appropriate WiFi connection to connect for any network communication. Outside the application any internet communication (like browser or any other application) should done through same selected WiFi connection. The scanning for WiFi and setting the connection is almost similar to Blackberry WiFi Setup. If anyone know how to implement this using available RIM API and let me know its possible or not. Please share if anyone have any code snippet related to this. I am looking for OS v4.5, 4.7, and 5.0. Thanks, siddh.

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• Simple network gaming, client-server architecture planning.

  - by michal

  Hi, I'm coding simple game which I plan to make multiplayer (over the network) as my university project. I'm considering two scenarios for client-server communication: The physics (they're trivial! I should call it "collision tests" in fact :) ) are processed on server machine only. Therefore the communication looks like Client1->Server: Pressed "UP" Server->Clients: here you go, Client1 position is now [X,Y] Client2->Server: Pressed "fire" Server->Clients: Client1 hit Client2, make Client2 disappear! server receives the event and broadcasts it to all the other clients. Client1->Server: Pressed "UP" Server->Clients: Client1 pressed "UP", recalculate his position!! [Client1 receives this one as well!] Which one is better? Or maybe none of them? :)

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• How do you encrypt data between client and server running in Flash and Java?

  - by ArmlessJohn

  We have a multiclient system where the client is written in Flash and the server is written in Java. Currently, communication is done in Flash by usage of flash.net.Socket and the protocol is written in JSON. The server uses a custom port to receive connections and then proceed to talk with each client. As expected, data is sent and received on both fronts as raw bytes, which are then decoded as needed. We would like to encrypt the communication between clients and server. I have some basic understanding about public/private key encryption, but I do not know what is the best way to exchange keys or what libraries are available (on both languages) to do this. What would be the best strategy to attack this problem and where should I start looking for libraries/methods to implement this encryption?

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• IPC between .NET and C++ applications

  - by Dimitri C.

  Are there any libraries for inter-process communication (IPC) between a .NET application and a native C++ application?

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• Is a Service Bus a good option to communicate with multiple external servers?

  - by PFreitas

  We are developing an application that communicates, via web services or TCP/IP sockets, with multiple servers (up to 50 different external companies). Basically, the exchanged messages are the same (XML), but depending on the inputs of our application we should call 1 or more external servers. The benefits we would expect of introducing a Service Bus in the architecture would be: 1- Remove the need to manage all point-to-point configurations (all the 50 endpoints); 2- Simplify the communication layer of our application by having only one server to talk to; Is a Service Bus a good architectural option for this scenario? What is the best (simplest) Service Bus for this kind of communication? I read a few MSDN articles on Azure Service Bus Relay, but it didn’t seem to fit our needs. Am I wrong? Thanks for your help.

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• WCF interoperability with WSDL proxy and performance consideration advise.

  - by user194917

  I'm essentially writing a broker service. The requirement is that I write an API that acts as an intermediary broker between our in-house developed services and a 3rd party provided API. The intention being that my API abstract the actual communication with the 3rd party API from our internal systems. The architect on the project chose WCF as the communication framework. The problem is that 70 percent of our subscriber applications are written in .Net 2 and as such have no access to the class libraries required to implement a WCF proxy. The end result being that our proxy classes are loosely based on the code auto generated by the WSDL tool as opposed to the SvcUtil tool. My question is, although I have no issues implementing the required proxy classes using basicHttp as the actual binding and using the WSDL tool, are there any special considerations that I need to take into account in this scenario? I.E proxy optimizations and the like. Thanks in advance.

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• Chat Server with sockets in C

  - by Andrew

  I'm trying to write a chat server in C that allows communication between two clients using POSIX sockets. I'm not sure I have a good grasp on this concept or how I should set up the communication protocol between the clients and the server. I know I need one socket to bind() the server port to so I can accept incoming connections from clients, but in order to have two clients connected at the same time do I need to create a socket for each of these clients when I accept() or should I accept() a client and then fork() so I can have another client accept? I'm not worried about concurrent chatting yet, it's more of a ping-pong approach where the clients need to wait for a recv() after they send() before they can type a new message.

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• Ideal way/architecture to deliver large data over Web Services

  - by zengr

  We are trying to design 6 web services, which will serve another client component. The client component requires data from the web service we are implementing. Now, the problem is, there is not 1 WS we are implementing, there is one WS which the client component hits, this initiates a series (5 more) of WSs which gather data from their respective data stores and finally provide the data back to the original WS, which then delivers the data back to the client component. So, if the requested data becomes huge, then, this will be a serious problem for our internal communication channel. So, what do you guys suggest? What can be done to avoid overloading of the communication channel between the internal WS and at the same time, also delivering the data to the client component.

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• Alternative way to notify the user of an error

  - by Lily

  I have a winform software that communicates with hardware through a protocol. Sometimes error in communication happens and i would like to notify the user. Errors could be for example: timeouts, crc errors, physical disconnection etc... I have a communication window in which i show these errors, but by default this is hidden. The user can open it though the menubar. Popups are annoying to the user (and to myself) so i would like a un-invasive way to notify the user that an error has occurred. Perhaps a info bubble like when XP tells you updates are ready for your computer? I know that NotifyIcon can help put things in the system tray, which i do not wish to have. I'd rather keep it within my MDI. I'm open to other creative ideas as well.

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• (Secure) alternative to TLS / SSLv3 ?

  - by CSkau

  Toying with an idea for a F2F networked application I've just been reading up on secure communication. I quickly settled with the idea of using TLS / SSL as the basis for any communication since it employs Public Key encryption at the protocol level and thus is perfect for my needs. However I was surprised to read (on wikipedia) that the newest version of TLS, SSLv3 uses a mix of MD5 and SHA-1 "because if any vulnerability was found in one of these algorithms the other would prevent it from compromising SSLv3". However, as I take it, lately both have been found flawed ! So my questions are thus: Does this not mean that SSLv3 is basically flawed, or am I not reading close enough ? And if so does a "secure" alternative to SSLv3 exist ?

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• Where is the best place to start learning Java Socket Programming?

  - by MarcoBoomTing

  I wish to create a Java Socket server which can be connected to using Javascript and/or Flash. I have experience in Connecting to sockets in flash, and using a comet like system in Ajax. I wish to make a live communication system, which will intale multiple connections to the server from various clients, needing almost instant communication between peers. I coded a system like this in PHP but I want to convert it to Java, simply because I don't want the PHP engine to be tied up on this Sever, as it serves all the web stuff normally on the site, and i've heard is more powerful for this sort of thing. Just looking for advice on where I can start learning how to write this sort of system using Java? I have previous coding experience in PHP, Javascript, Adobe Air and AS3 if That helps?

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