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• Connect to NFS on availability

  - by berkes

  What would be a good way to automatically mount an NFS when it gets/is available? I have the following: Media server at home, running Ubuntu, 10.10 with GUI *) Laptop often at home, often on the road or at clients. Ubuntu 10.10 with GUI. What I'd like is my laptop connecting to the nfs (or any other mountable networked filesystem) so that Banshee sees all the music, new podcast-entries (and video) from that media-server. I already have firefly (mt-daapd) running, which works, but is flakey on both server-side and client-side. But its biggest downside, is that I cannot easily fix metadata on files on the media-server this way. DAAP is read-only by design. I can mount nfs manually, through a sudo mount /media/nfsmultimedia/. I am not looking for a manual, or howto on setting up a NFS client and server. Merely a way to have this more transparently working. Obviously I'd like the NFS to be unmounted if the network is no longer available (i.e. when I open my laptop-lid on my clients buro). It may be, that an NFS is not suited for this, in that case, I'd love to hear other options. :) *) Actually: I also have a fileserver, backupserver and webserver to which I'd like to connect in a somewhat similar way. Right now I connect to these over SSH, using gvfs.

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• What stops HTML5 and JS apps to perform as good as native apps?

  - by Amogh Talpallikar

  From what I understand, HTML is a mark-up language, so is the content of XAML, XIB and whatever Android uses and other native UI development frameworks. JavaScript is a programming language used along with it to handle client side scripting which will include things like event handling, client side validations and anything else C#,Java,Objective-C or C++ do in various such frameworks. There are MVC/MVVM patterns available in form frameworks like Sencha's, Angular etc. We have localStorage in form of both sqlite and key-value store as other frameworks have and you have API specification for almost everything that it missing. Whenever a native UI frameworks has to render UI , it has to parse a similar the markup and render the UI. Question break-down What stops from doing the same in HTML and JS itself ? Instead of having a web-control or browser as a layer in between why can't HTML(along with CSS) and JS be made to perform the same way ? Even if there is a layer,so does .net runtime and JVM are in other cases where C++,C are not being used. So Lets take the case of Android, like Dalvik, why Can't Chromium be another option(along with dalvik and NDK) where HTML does what android markup does and JavaScript is used to do what Java does ? So the Question is, Even if current implementations aren't as good, but theoretically is it possible to get HTML5 based applications to work as other native apps specially on mobile ?

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• IE8 HTTPs Download Issue

  - by Jon Egerton

  I have a problem with a system I develop related to IE8 downloading over SSL (ie on sites using https://...) and is described on this MS kb article: http://support.microsoft.com/kb/323308 We use the HTTPCacheability.NoCache option as the data being downloaded is sensitive, and is downloaded from a secured site. I don't want that data to be cached on any of the proxies etc that the response passes through back to the client. The article describing the issue details a fix to the client side registry changing a BypassSSLNoCacheCheck setting. I don't want to loosen the system security just for IE8, as the system works fine on anything more upto date. Getting all the clients to apply the hotfix is difficult at best, and impossible at worst. We need to support IE8 in the system, at least for now. So: 1: Does the detailed hotfix have any implications for the security at the browser end in IE8 - does it mean the file will be cached? (in a place other than where the user saves the file). 2: Is there some way I can get these files downloadable with a change at the server end that doesn't break the security side of things?

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• Strategy for hosting 700+ domains, each with static HTML site

  - by jonschlinkert

  I have a portfolio of more than 700 domain names, and ideally I'd like to put up a single-page HTML/CSS/JavaScript webpage for each domain. Is there a system/strategy/workflow that will allow me to: Automate the deployment of new websites, quickly and easily without having to manually initiate each new website in an admin panel. For instance, I've seen dropbox-based solutions that claim to make it simple to setup new websites on your dropbox account, but you still have to set each one up in an admin interface first. It would be so much easier to have a folder naming convention that allowed the user to easily clone/copy/duplicate sites inside their Dropbox App folder (https://www.dropbox.com/developers/blog/23) to create new ones. Sounds interesting, however... It's easy to managing CNAMEs on the registrar-side, is there a way to quickly associate CNAMEs with new websites, maybe gh-pages-style (https://help.github.com/articles/setting-up-a-custom-domain-with-pages)? With GitHub's gh-pages, all you have to do is drop a file called CNAME into your repo, with the domain name you want associated with the repo inside the file. gh-pages isn't a good solution for what I'm doing though unfortunately. I'm also a front-end developer, specializing in rapid web development and "front-end build systems", so I building and maintaining static assets for hundreds of sites is no problem. It's the hosting-side that I really struggle with. Any suggestions?

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• What do you wish language designers paid attention to?

  - by Berin Loritsch

  The purpose of this question is not to assemble a laundry list of programming language features that you can't live without, or wish was in your main language of choice. The purpose of this question is to bring to light corners of languge design most language designers might not think about. So, instead of thinking about language feature X, think a little more philisophically. One of my biases, and perhaps it might be controversial, is that the softer side of engineering--the whys and what fors--are many times more important than the more concrete side. For example, Ruby was designed with a stated goal of improving developer happiness. While your opinions may be mixed on whether it delivered or not, the fact that was a goal means that some of the choices in language design were influenced by that philosophy. Please do not post: Syntax flame wars (I could care less whether you use whitespace [Python], keywords [Ruby], or curly braces [Java, C/C++, et. al.] to denote program blocks). That's just an implementation detail. "Any language that doesn't have feature X doesn't deserve to exist" type comments. There is at least one reason for all programming languages to exist--good or bad. Please do post: Philisophical ideas that language designers seem to miss. Technical concepts that seem to be poorly implemented more often than not. Please do provide an example of the pain it causes and if you have any ideas of how you would prefer it to function. Things you wish were in the platform's common library but seldom are. One the same token, things that usually are in a common library that you wish were not. Conceptual features such as built in test/assertion/contract/error handling support that you wish all programming languages would implement properly--and define properly. My hope is that this will be a fun and stimulating topic.

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• How bad it's have two methods with the same name but differents signatures in two classes?

  - by Super User

  I have a design problem relationated with the public interface, the names of methods and the understanding of my API and my code. I have two classes like this: class A: ... function collision(self): .... ... class B: .... function _collision(self, another_object, l, r, t, b): .... The first class have one public method named collision and the second have one private method called _collision. The two methods differs in arguments type and number. In the API _m method is private. For the example let's say that the _collision method checks if the object is colliding with another_ object with certain conditions l, r, t, b (for example, collide the left side, the right side, etc) and returns true or false according to the case. The collision method, on the other hand, resolves all the collisions of the object with other objects. The two methods have the same name because I think is better avoid overload the design with different names for methods who do almost the same think, but in distinct contexts and classes. This is clear enough to the reader or I should change the method's name?

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• Deciding on a company-wide javascript strategy [on hold]

  - by drogon

  Our company is moving most of its software from thick-client winforms apps to web apps. We are using asp.net mvc on the server side. Most of the developers are brand new to the web and need to become efficient and knowledgeable at writing client-side web code (javascript). We are deciding on a number of things and would appreciate feedback on the following: Angular.js or Backbone.js? Backbone (w/ Underscore) is certainly more light weight, but requires more custom development. Angular seems to be a full-fledged framework, but would require everyone to embrace it and probably a longer learning curve(??). (Note: I know nothing about Angular at this point) Require.js or script includes w/ MVC bundleconfig? Require.js makes development "feel like" c# (importing namespaces). But, integrating the build/minification process can be a pain (especially the configuration). Bundling via mvc requires developers to worry more about which scripts to include but has less overall development friction. Typescript vs Javascript Regardless of frameworks, our developers are going to need to learn the basics. Typescript is more like c# and MAY be easier for c# developers to understand. However, learning TypeScript before javascript may hinder their mastery of javascript at the expense of efficiency.

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• Conflict resolution for two-way sync

  - by K.Steff

  How do you manage two-way synchronization between a 'main' database server and many 'secondary' servers, in particular conflict resolution, assuming a connection is not always available? For example, I have an mobile app that uses CoreData as the 'database' on the iOS and I'd like to allow users to edit the contents without Internet connection. In the same time, this information is available on a website the devices will connect to. What do I do if/when the data on the two DB servers is in conflict? (I refer to CoreData as a DB server, though I am aware it is something slightly different.) Are there any general strategies for dealing with this sort of issue? These are the options I can think of: 1. Always use the client-side data as higher-priority 2. Same for server-side 3. Try to resolve conflicts by marking each field's edit timestamp and taking the latest edit Though I'm certain the 3rd option will open room for some devastating data corruption. I'm aware that the CAP theorem concerns this, but I only want eventual consistency, so it doesn't rule it out completely, right? Related question: Best practice patterns for two-way data synchronization. The second answer to this question says it probably can't be done.

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• Why did the web win the space of remote applications and X not?

  - by Martin Josefsson

  The X Window System is 25 years old, it had it's birthday yesterday (on the 15'th). As you probably are aware of, one of it's most important features is the separation of the server side and the client side in a way that neither Microsoft's, Apples or Wayland's windowing systems have. Back in the days (sorry for the ambiguous phrasing) many believed X would dominate over other ways to make windows because of this separation of server and client, allowing the application to be ran on a server somewhere else while the user clicks and types on her own computer at home. This use obviously still exists, but is marginalized at best. When we write and use programs that run on a server we almost always use the web with it's html/css/js. Why did the web win, and X not? The technologies used for the web (said html/css/js) are a mess. Combined with all the back-end-frameworks (Rails, Django and all) it really is a jungle to navigate thru. Still the web thrives with creativity and progress, while remote X apps do not.

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• Engine for 2D Top-Down Physics-Based Skeletal Animation

  - by RylandAlmanza

  I just watched at the Sui Generis video, and was completely amazed. Specifically, the part where the big troll thing is beating up the player with his flail. This got me really excited, and I would like to try implementing something like this in a 2D Top-Down format. Something like this. That atloria example seems simple enough, but it's not exactly what I'm looking to make. I think atloria is using predefined animations, where as I would like to make something more physics-based like the Sui Generis engine does. So, I'm wondering what physics engines might work for something like this, and if I'd need to implement my own skeletal system, or if I could just use "joints" and such from the engine. The only experience I have in terms of physics engines is Box2D, which I've heard shouldn't be used for top-down settings, and I can think of a few reasons it wouldn't work out well. One of those reasons being gravity. In box 2D, gravity pulls towards a side of the screen (usually the bottom.) I wouldn't want my player's forearms constantly being pulled to one side. :) Also should mention that the programming language doesn't matter all that much to me. I'm currently playing with HTML5 stuff, though. :) Thanks in advance!

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• Looks Like We Made It! What's Up on Thursday at Oracle OpenWorld

  - by Oracle OpenWorld Blog Team

   By Karen Shamban Thursday is the last day of the conference for 2012, and there's still much to see and do. The day starts with an awesome keynote session, which includes a discussion with Michael Lewis, the author of Moneyball, Liar's Poker, and The Blind Side -- you won't want to miss it! Here's what's happening on Thursday at Oracle OpenWorld 2012: Registration Moscone West, Moscone South, Hilton San Francisco, Hotel Nikko, 8:00 a.m. - 4:00 p.m. Westin St. Francis, 8:00 a.m. - 5:00 p.m. Oracle OpenWorld Keynote featuring Oracle President Mark Hurd, and Oracle Executive Vice President Bob Weiler in conversation with Michael Lewis, author of Moneyball, Liar's Poker, and The Blind Side Moscone North Hall D, 9:00 a.m. - 10:45 a.m. Sessions, Labs Various times and locations Oracle OpenWorld Music Festival @ It's a Wrap! Yerba Buena Gardens, 3:30 p.m. - 6:30 p.m. Think back to everything you wanted to do while you attended the conference -- and be sure you get it done on Thursday!

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• Low-res emacs24 icon in application switcher 12.10

  - by MTS

  I recently upgraded to Quantal, and also switched up to emacs24 from 23. Everything is great, except for one thing: the icon in the Application Switcher for emacs24 is a horrible, low-resolution eyesore. Compare the two side-by-side: I've seen a couple of questions addressing issues like this, but they're not quite the same. This one says that it is happening with all icons, but that's clearly not the case here. And this one seems more relevant, but it is talking about Gnome, not Unity. In the comments to the one answer for the second question, it says to look at the icons in /usr/share/icons to see if they are low-resolution, and if so to replace them with better ones. There's a ton of emacs icons, in fact. They are in various subfolders of /usr/share/icons/hicolor and they are in sizes ranging from 16x16 to 128x128, and also there are scaleable .svg versions of the icons too. I noticed that there are no 192x192 or 256x256 versions. But it seems like that shouldn't matter, since emacs23 also didn't have icons in those sizes. Any help would be much appreciated!

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• tdd is about design not verification what does it concretely mean?

  - by sigo

  I've been wondering about this. What do we exactly mean by design and verification. Should I just apply tdd to make sure my code is SOLID and not check is correct external behaviour ? Should I use Bdd for the correct behaviour part ? Where I get confused also is regarding TDD code katas, to me they looked like more about verification than design... shouldn't they be called bdd katas instead of tdd katas? I reckon that for example uncle bob bowling kata leads in the end to a simple and nice internal design but I felt that most of the process was more around vérification than design. Design seemed to be a side effect of testing incrementally the external behaviour. I didnt feel so much that we were focusing most of our efforts on design but more on vérification. While normally we are told the contrary, that in TDD, verification is a side effect, design is the main purpose. So my question is what should i focus exactly on when i do tdd: SOLID, external Api usability, what else...? And how can I do that without being focused on verification ? What do you guys focus your energy on when you are practicing TDD ?

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• canvas tile grid, hover effects, single tilesheet, etc

  - by user121730

  I'm currently in the process of building both the client and server side of an html5, canvas, and WebSocket game. This is what I have thus far for the client: http://jsfiddle.net/dDmTf/7/ Current obstacles The hover effect has no idea what to put back after the mouse leaves. Currently it's just drawing a "void" tile, but I can't figure out how to redraw a single tile without redrawing the whole map. How would I go about storing multiple layers within the map variable? I was considering just using a multi-dimensional array for each layer (similar to what you see as the current array), and just iterating through it, but is that really an efficient way of doing it? Side note The tile sheet being used for the jsfiddle display is only for development. I'll be replacing it as things progress in the engine. I hope you can help! Hopefully you guys can help me, I've been struggling to get through things, since I'm learning how things kind of stuff works as I go. If you guys have any pointers for my JavaScript, feel free. As I'm more or less learning advanced usage as I go, I'm sure I'm doing plenty of things wrong. Note: I will continue to update this post as the engine improves, but updating the jsfiddle link and updating the obstacles list by striking things that have been solved, or adding additions. Thanks!

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• Google search question, front page not showing

  - by user5746

  I know this is probably a dumb question but I hope someone can give me some insight; I was ranked on Google first page of search results for "funny st patricks day shirts" but I was third from the bottom and not familiar enough with SEO, so I signed up for "Attracta" to rank higher. Big mistake. Since using Attracta, I've lost the first page and I'm now on the fourth page in that search. What I noticed is that Google is now just showing a sub-page or side page, (a link from my front page, to a page which has only a few designs in it) this is not where I would want customers to land first... but my front page is not showing in that search anymore. Obviously, the title of this side page is not geared toward that search result, so I know that's why I have the pr drop. Why is my front page not ranking over that page, though? Why is it apparently gone from that search, or so far back no one will ever find it? I need to know how to fix this quick if anyone has any advice at all for me. It's the busiest season for my website and the people who were stealing design ideas from me are all ranked higher than my site now. (I can prove this, lol) So, I'm very frustrated by that. I would be very grateful to have any advice at all as to what I can do to fix this. THANKS in advance for any advice you can offer. Catelyn

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• OUCH! Laptop running SUPER HOT after 12.10 upgrade!

  - by dinkelk

  I was running 12.04 for 6 months, my laptop ran almost silently and cool enough to hold on my lap. I updated to 12.10 and now my computer gets too hot to hold on my lap and the fan is constantly running on full blast. This is the output of sensors: acpitz-virtual-0 Adapter: Virtual device temp1: +84.0°C (crit = +99.0°C) coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +84.0°C (high = +86.0°C, crit = +100.0°C) Core 0: +74.0°C (high = +86.0°C, crit = +100.0°C) Core 1: +72.0°C (high = +86.0°C, crit = +100.0°C) Core 2: +75.0°C (high = +86.0°C, crit = +100.0°C) Core 3: +84.0°C (high = +86.0°C, crit = +100.0°C) radeon-pci-0100 Adapter: PCI adapter temp1: +76.0°C I have an HP Pavilion dv6, i7, amd radeon graphics. Please let me know if you need additional information. What could be different between the two Ubuntu editions that caused such a drastic change? Edit 1: Per @Paul's suggestion, I ran htop to try to narrow down the problem. Here is the result! (left side of terminal) (right side of terminal) This is about 10 minutes after boot-up, htop, yakuake, and a chrome page with 1 tab opened to this question are all that I have manually opened. The most taxing program to the CPU is htop itself. I think that the problem must lie elsewhere; my temps are already up to ~65C for the CPU and ~69C for the GPU, with nearly 0% CPU usage.

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• Collision detection between a sprite and rectangle in canvas

  - by Andy

  I'm building a Javascript + canvas game which is essentially a platformer. I have the player all set up and he's running, jumping and falling, but I'm having trouble with the collision detection between the player and blocks (the blocks will essentially be the platforms that the player moves on). The blocks are stored in an array like this: var blockList = [[50, 400, 100, 100]]; And drawn to the canvas using this: this.draw = function() { c.fillRect(blockList[0][0], blockList[0][1], 100, 100); } I'm checking for collisions using something along these lines in the player object: this.update = function() { // Check for collitions with blocks for(var i = 0; i < blockList.length; i++) { if((player.xpos + 34) > blockList[i][0] && player.ypos > blockList[i][1]) { player.xpos = blockList[i][0] - 28; return false; } } // Other code to move the player based on keyboard input etc } The idea is if the player will collide with a block in the next game update (the game uses a main loop running at 60Htz), the function will return false and exit, thus meaning the player won't move. Unfortunately, that only works when the player hits the left side of the block, and I can't work out how to make it so the player stops if it hits any side of the block. I have the properties player.xpos and player.ypos to help here.

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• On Screen Coin Animation

  - by Siddharth

  am working with side scrolling skater game. I want to perform coin animation such that as player collect coin it moves upside and attach with currency sprite. My main character and coin present in game scene and currency sprite present in HUD layer. This situation creates problem for me. Directly I can not apply modifier to coin because it is side scrolling game so based on main character speed it reaches at different position. That I have checked. So that I have to generate other coin at same position at game layer coin has, in HUD layer and move upward to it. But I didn't able to get its y position correct though I can able to get x position correctly. Many time main character goes downward so it get minus value many time. I also tried following code float[] position = GameHUD.this .convertSceneCoordinatesToLocalCoordinates(GameManager .getInstance().getCoinX(), GameManager.getInstance() .getCoinY()); But I am getting same coordinate as I provide. No difference in that so please some one provide me guidance in that. Because I am near to complete my game. EDIT: Here game layer and hud layer is totally different. Actual coin present in game layer which player has to collect and at same position I want to generate another coin in hud layer to perform some animation. It is recommended to generate coin in hud layer because through that only I can able to complete my target.

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• A simple example of movement prediction

  - by Daniel

  I've seen lots of examples of theory about the reason for client-side prediction, but I'm having a hard time converting it into code. I was wondering if someone knows of some specific examples that share some of the code, or can share their knowledge to shed some light into my situation. I'm trying to run some tests to get a the movement going (smoothly) between multiple clients. I'm using mouse input to initiate movement. I'm using AS3 and C# on a local Player.IO server. Right now I'm trying to get the Client side working, as I'm only forwarding position info with the client. I have 2 timers, one is an onEnterFrame and the other is a 100ms Timer, and one on mouseClick listener. When I click anywhere with a mouse, I update my player class to give it a destination point On every enterFrame Event for the player, it moves towards the destination point At every 100ms it sends a message to the server with the position of where it should be in a 100ms. The distance traveled is calculated by taking the distance (in Pixels) that the player can travel in one second, and dividing it by the framerate for the onEnterFrame handler, and by the update frequency (1/0.100s) for the server update. For the other Players, the location is interpolated and animated on every frame based on the new location. Is this the right way of doing it?

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• Unity, changing gravity game & stopping character when he hit a wall.

  - by Sylario

  i am currently working on a 2d puzzle game in the unity engine. One of the aspect of this game is the possibility to rotate the level of 90°. It also rotate the gravity. The main character is not directly controlled by the player, but instead fall when the level is rotated. When the main character hit a wall, he should stop to move. If i do not stop it, it kind of blink ans shake against the wall. To stop it i detect collision and depending on the current rotation state, the player will stop at "vertical" or "horizontal" tags when a OnCollisonEnter occurs. I must do that because when the player fall on his relative ground, He must not stop like if he had touch a wall. My problem is the 'side' of platform, or the 'top' of wall, they use the same tag and thus do not give the correct tag to my character. I tried to put a very small invisible box on top/side of elements but the collision occurs nevertheless. It seems when the player falls and hit something he go through a bit before being replaced at correct position by unity. Is there a way : 1 ) to doesn't stop my character but to make it appear immobile on screen 2 ) To detect a "i cannot move anymore" collision other than by using collision?

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• Square game map rendered as sphere with OpenGL

  - by Roflha

  Okay so I have been trying to find a good way to do this for a while now and so far I have nothing. For a hobby project of mine I have created a finite voxel world (similar to minecraft), but as I said, mine is finite. When you reach the edge of it, you are sent to the other side. That is all working fine along with rendering the far side of the map, but I want to be able to render this grid as a sphere. Looking down from above, the world is a square. I basically want to be able to represent a portion of that square as a sphere, as if you were looking at a planet. Right now I am experimenting with taking a circular section of the map, and rendering that, but it look to flat (no curvature around the edges). My question then, is what would be the best way to add some curvature to the edges of a 2d circle to make it look like a hemisphere. However, I am not overly attached to this implementation so if somebody has some other idea for representing the square as a planet, I am all ears.

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• Make Gameobject Stand On Surface Facing Certain Direction

  - by Julian

  I want to make a biped character stand on any surface I click on. Surfaces have up vectors of any of positive or negative X,Y,Z. So imagine a cube with each face being a gameobject whose up vector pointing directly away from the cube. If my character is facing "forward" and I click on a surface which is to the left or right of me ( left or right walls), I want my character to now be standing on that surface but still be facing in the direction he initially was. If I click on a wall which is in the forward path of my character i want him to now be standing on that surface and his forward to now be what was once "up" relative to my character. Here is the code I am working with now. void Update() { if (Input.GetMouseButtonUp (0)) { RaycastHit hit; var ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (Physics.Raycast(ray, out hit)) { Vector3 upVectBefore = transform.up; Vector3 forwardVectBefore = transform.forward; Quaternion rotationVectBefore = transform.rotation; Vector3 hitPosition = hit.transform.position; transform.position = hitPosition; float lookDifference = Vector3.Distance(hit.transform.up, forwardVectBefore); if(Vector3.Distance(hit.transform.up, upVectBefore) < .23) //Same normal { transform.rotation = rotationVectBefore; } else if(lookDifference > 1.412 && lookDifference <= 1.70607) //side wall { transform.up = hit.transform.up; transform.forward = forwardVectBefore; } else //head on wall { transform.up = hit.transform.up; transform.forward = upVectBefore; } } } } The first case "Same normal" works fine, however the other two do not work as I would like them to. Sometimes my character is laying down on the surface or on the wrong side of the surface. Does anyone know nice way of solving this problem?

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• "TDD is about design, not verification"; concretely, what does that mean?

  - by sigo

  I've been wondering about this. What do we exactly mean by design and verification. Should I just apply TDD to make sure my code is SOLID and not check if it's external behaviour is correct? Should I use BDD for verifying the behaviour is correct? Where I get confused also is regarding TDD code Katas, to me they looked like more about verification than design; shouldn't they be called BDD Katas instead of TDD Katas? I reckon that for example the Uncle Bob bowling Kata leads in the end to a simple and nice internal design but I felt that most of the process was centred more around verification than design. Design seemed to be a side effect of testing the external behaviour incrementally. I didn't feel so much that we were focusing most of our efforts on design but more on verification. While normally we are told the contrary, that in TDD, verification is a side effect, design is the main purpose. So my question is what should I focus on exactly, when I do TDD: SOLID, external API usability, or something else? And how can I do that without being focused on verification? What do you guys focus your energy on when you are practising TDD?

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• Using a random string to authenticate HMAC?

  - by mrwooster

  I am designing a simple webservice and want to use HMAC for authentication to the service. For the purpose of this question we have: a web service at example.com a secret key shared between a user and the server [K] a consumer ID which is known to the user and the server (but is not necessarily secret) [D] a message which we wish to send to the server [M] The standard HMAC implementation would involve using the secret key [K] and the message [M] to create the hash [H], but I am running into issues with this. The message [M] can be quite long and tends to be read from a file. I have found its very difficult to produce a correct hash consistently across multiple operating systems and programming languages because of hidden characters which make it into various file formats. This is of course bad implementation on the client side (100%), but I would like this webservice to be easily accessible and not have trouble with different file formats. I was thinking of an alternative, which would allow the use a short (5-10 char) random string [R] rather than the message for autentication, e.g. H = HMAC(K,R) The user then passes the random string to the server and the server checks the HMAC server side (using random string + shared secret). As far as I can see, this produces the following issues: There is no message integrity - this is ok message integrity is not important for this service A user could re-use the hash with a different message - I can see 2 ways around this Combine the random string with a timestamp so the hash is only valid for a set period of time Only allow each random string to be used once Since the client is in control of the random string, it is easier to look for collisions I should point out that the principle reason for authentication is to implement rate limiting on the API service. There is zero need for message integrity, and its not a big deal if someone can forge a single request (but it is if they can forge a very large number very quickly). I know that the correct answer is to make sure the message [M] is the same on all platforms/languages before hashing it. But, taking that out of the equation, is the above proposal an acceptable 2nd best?

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• Windows recv method usage

  - by vandamon taigi

  I'm making a multiplayer game and I have an issue with the recv function ( or the send one , not sure ). Server side code : char* UserName = new char[256]; ZeroMemory(UserName,256); recv(sConnect,UserName,256,0); // works char* Password = new char[256]; ZeroMemory(Password,256); recv(sConnect,Password,256,0); // works users[ ++usercount ] = new Client(UserName,Password,sConnect); if( users[usercount] ->GetLogInSuccesful() ) send(sConnect,"0x0001",6,0); // debugging shows it gets here and sends the data. Client side code : send(server->getsConnect(),User,256,0); // works send(server->getsConnect(),Pass,256,0); // works char* Response = new char[6]; ZeroMemory(Response,6); recv(server->getsConnect(),Response,6,0); // gets stuck here. Any ideea why does it get stuck on that recv ? I also tried by making response [256] or such.

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