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• PHP security regarding login

  - by piers

  I have read a lot about PHP login security recently, but many questions on Stack Overflow regarding security are outdated. I understand bcrypt is one of the best ways of hashing passwords today. However, for my site, I believe sha512 will do very well, at least to begin with. (I mean bcrypt is for bigger sites, sites that require high security, right?) I´m also wonder about salting. Is it necessary for every password to have its own unique salt? Should I have one field for the salt and one for the password in my database table? What would be a decent salt today? Should I join the username together with the password and add a random word/letter/special character combination to it? Thanks for your help!

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• Is the Google Webmaster Tools verification temporary?

  - by Senseful

  When you add a site to Google Webmaster Tools, it asks you to verify it (e.g. via a <meta> tag). I verified a site a while ago, but when I logged in, I noticed that it isn't verified anymore. The history shows that it was verified 58 days ago, but then 30 days ago it tried and failed saying that "revierification failed". I'm not sure if this is a result of some setting I changed which required a reverification, or if Google Webmaster Tools periodically tries to verify the site. I was under the impression that the verification only happens once when you add the site, and then you can delete the <meta> tag. If this is not how it works, and it does reverify periodically, will it require a different <meta> tag value or can I keep the original one I used and never have to worry about it again?

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• Creating natural environments that can run on lower end computers in Unity3D/C#

  - by Timothy Williams

  So, I'm starting work on a project soon that will require me to create realistic environments that can preferably run on PC's besides high quality ones. The goal is to get as real an environment as possible while still being easy(ish) to run. The only problem is I've NEVER done anything with 3D environments, making trees sway, grass move, lighting, etc. Can anyone give me any help? Perhaps describe how it's done? Link me to articles? I'm just looking to be pointed in the right direction, not for you to write the code for me. Any help at all would be greatly appreciated, I'm using Unity3D and C# as my language. Thanks, Tim.

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• Tomcat JNDI Connection Pool docs - Random Connection Closed Exceptions

  - by Andy Faibishenko

  I found this in the Tomcat documentation here What I don't understand is why they close all the JDBC objects twice - once in the try{} block and once in the finally{} block. Why not just close them once in the finally{} clause? This is the relevant docs: Random Connection Closed Exceptions These can occur when one request gets a db connection from the connection pool and closes it twice. When using a connection pool, closing the connection just returns it to the pool for reuse by another request, it doesn't close the connection. And Tomcat uses multiple threads to handle concurrent requests. Here is an example of the sequence of events which could cause this error in Tomcat: Request 1 running in Thread 1 gets a db connection. Request 1 closes the db connection. The JVM switches the running thread to Thread 2 Request 2 running in Thread 2 gets a db connection (the same db connection just closed by Request 1). The JVM switches the running thread back to Thread 1 Request 1 closes the db connection a second time in a finally block. The JVM switches the running thread back to Thread 2 Request 2 Thread 2 tries to use the db connection but fails because Request 1 closed it. Here is an example of properly written code to use a db connection obtained from a connection pool: Connection conn = null; Statement stmt = null; // Or PreparedStatement if needed ResultSet rs = null; try { conn = ... get connection from connection pool ... stmt = conn.createStatement("select ..."); rs = stmt.executeQuery(); ... iterate through the result set ... rs.close(); rs = null; stmt.close(); stmt = null; conn.close(); // Return to connection pool conn = null; // Make sure we don't close it twice } catch (SQLException e) { ... deal with errors ... } finally { // Always make sure result sets and statements are closed, // and the connection is returned to the pool if (rs != null) { try { rs.close(); } catch (SQLException e) { ; } rs = null; } if (stmt != null) { try { stmt.close(); } catch (SQLException e) { ; } stmt = null; } if (conn != null) { try { conn.close(); } catch (SQLException e) { ; } conn = null; } }

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• What is the best way to bind a repeater to an AJAX response?

  - by Murtaza RC

  I am trying to bind a repeater after an AJAX response. Step 1 : Make an Ajax call to the fucntion in the code behind: Step 2 : Do some business logic and finally bind the data to the repeater Step 3 : Get the response back from the codebehind to the Ajax call Step 4 : Once we get the response back what is the right way to strip out extra HTML for example the head and body tags etc. One way is to put a "breaker" logic. for example : <html><body> #breaker REPEATER control HERE #breaker </html></body> and once I get the response back I use a JS function to find anything between the #breaker tags and strip out anything outside and I should get the required HTML response of only the repeated items. Is this the only / Best way to achieve this kind of functionality?

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• A Quantity class with units

  - by Ryan Ohs

  Goals Create a class that associates a numeric quantity with a unit of measurement. Provide support for simple arithmetic and comparison operations. Implementation An immutable class (Could have been struct but I may try inheritance later) Unit is stored in an enumeration Supported operations: Addition w/ like units Subtraction w/ like units Multiplication by scalar Division by scalar Modulus by scalar Equals() >, >=, <, <=, == IComparable ToString() Implicit cast to Decimal The Source The souce can be downloaded from Github. Notes This class does not support any arithmetic that would modify the unit. This class is not suitable for manipulating currencies. Future Ideas Have a CompositeQuantity class that would allow quantities with unlike units to be combined. Similar currency class with support for allocations/distributions. Provide conversion between units. (Actually I think this would be best placed in an external service. Many situations I deal with require some sort of dynamic conversion ratio.)

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• Strange error in ASP.NET

  - by rockinthesixstring

  Every once in a while I get about 10 - 20 identical errors on my asp.net app. It's always the same, and I'm wondering if it is someone trying to hack in (it happens about once a month). Source: System.Web Message: The file '/~/Default.aspx' does not exist. User IP: 89.122.29.80 User Browser: Unknown 0.0 User OS: Unknown Stack trace: at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean noAssert) at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp, Boolean noAssert) at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) at System.Web.UI.PageHandlerFactory.System.Web.IHttpHandlerFactory2.GetHandler(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) at System.Web.HttpApplication.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean completedSynchronously) why on earth would someone be trying to access "/~/Default.aspx" ?

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• Firefox extension: how to read a cookie name and value on the current page

  - by encryptor

  My extension works on an application, which requires user login. Once the user has logged in, I need to read the cookies and use them in my XMLHttpRequests. So initially I need to check if the cookie is set, if not, I direct the user to the login page. Once logged in, I need to read the cookies and send it as part of my further requests. How do I read cookies from a XMLHttpRequest or otherwise (if we don't even know the name of the cookie) There is to function as getRequestHeader.. but what I need is something like that.

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• recurring billing / profiles management system

  - by Karl Cassar

  As a company, we have various recurring fees which our clients pay - these can include: hosting plans maintenance agreements SLAs ... I would like to know if anyone knows of a good, web-based recurring billing / payments management system which we could use to help us get more organised regarding this aspect of our business. Basically, we would need to: Create recurring profiles, e.g: Hosting, emails / domain services @ 200eur / year Be able to give free / extend the subscription period, for any reason. Also, we don't have specific products which we would like to choose and charge - all these recurring fees are discussed with the clients, and are created on a per-client basis. I'm not sure if this is the best place to ask for, however since I think most 'webmasters' require such a system to keep track of payment, I thought this would be the place to go for. Thanks in advance!

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• Best way to deal with a system without a user acceptance / testing phase

  - by billy.bob

  Historically I've been able to get away with making small changes to an in-house helpdesk system riding on a LAMP stack and just making a backup prior to editing. This has no user acceptance / testing phase and I work on the live .php files directly. However now the requirement has arisen that will require a bit more coding done, and I'm obviously not particularly happy about making these changes without a framework to support me. What would the best way forward be? I could just make another backup I suppose.

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• Sessions in asp.net

  - by Indranil Mutsuddy

  Hello i have a login page so once the user enters the correct details he enters into the home page. Now i want to implement 3 things once he clicks the button 'log out' he must be redirected to a page saying" logged out successfully " n even if clicks the back button in the browser, he should not be able to access. if the user leaves the homepage idle for a specific amount of time say 10minutes and then he tries to navigate after 10 mins a msg should display saying "Your Session has been expired login again" if given the url of homepage he shouldnt be able to access unless logged in. I am not sure about what exactly i need to do and how to do. Plz Help Regards Indranil Mutsuddy

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• Cuda vs OpenCL - opinions

  - by Martin Beckett

  Interested in peoples opinions of Cuda vs openCL following NVidia's Cuda4 release. I had originally gone with openCL since cross platform, open standards are a good thing(tm). I assumed NVidia would fall into line as they had done with openGL. But having talked to some NVidia people, they (naturaly) claim that they will concentrate on CUDA and openCL is hampered by having committees and having to please everyone - like openGL. And with the new tools and libs in CUDA it's hard to argue with that. -I'm in a fairly technical market so I can require the users to have particular HW.

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• Triggering shouldStartLoadWithRequest with multiple window.location.href calls

  - by AlBeebe

  Im trying to pass multiple things from a webpage inside a UIWebView back to my iPhone app via the shouldStartLoadWithRequest method of the UIWebView. Basically my webpage calls window.location.href = "command://foo=bar" and i am able to intercept that in my app no problem. Now if i create a loop and do multiple window.location.href calls at once, then shouldStartLoadWithRequest only appears to get called on once and the call it gets is the very last firing of window.location.href at the end of the loop. The same thing happens with the webview for Android, only the last window.location.href gets processed.

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• What happens if you're unable to solve a problem?

  - by gablin

  I'm a year away from graduating from university, and I'm really looking forward to solving practical problems. Especially non-trivial ones which require a bit of research and a lot of thinking. But at the same time, that is also my greatest fear - being faced with a problem that I'm unable to solve, no matter how hard I try. And with pressure to deliver code on impending deadlines just around the corner, it does look a bit scary when viewing it from the safe playgrounds on uni (where the worst thing that can happen is that you have to redo a course or exam). So for those who have been in industry for any longer length of time, what would happen if you were told to solve a problem that you couldn't? Has it happened, and if so, what did happen? Did they just drop it and said "Oh well, guess we can make do with something else"? Were there consequences? Were you reprimanded, or even fired?

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• How should I invoke a physics engine?

  - by ymfoi

  I'm new to writing games. I'm planning to write a 2D battle game which may require an physics engine. Suppose I've written one, but how can I combine it with the main routine of my game? Should I attach it directly to the graphics render routine or put it in an individual thread? I've spent much time looking for some common approach, but found nothing. So can you reveal some basics idea for me, a newbie? Thanks! P.S. There're many other problems I have to deal with if I choose to start a separate thread for the physics engine, for example, the lock problem, while from my intuition, I guess I'd better separate the render and the physics engine.

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• Do we set the bar too high by requiring that code tests not suffer from buffer overflow?

  - by brice

  We are currently recruiting for a Junior Developer position working mainly in C on Linux. As part of the process, we require candidates to complete a code test at their leisure in C. So far we have rejected two candidates on the basis that their code, although readable and in one case rather idiomatic, suffered from buffer overflow errors due to unbounded buffer writes. Are buffer overflows acceptable from a graduate developer? Are we setting the bar too high? What is the expected capability of graduate/Junior engineers? [Edit]: We explicitly ask for error-checked, production quality code. We provide a test & build framework for the candidates

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• How can I create a temporary sandbox to compile from source?

  - by zoopp

  I want to follow the steps found here in order to run League of Legends under Ubuntu. According to the guide, I have to compile wine from source because it needs some patches. Compiling from source involves downloading quite a few dependency packages which I don't want to get mixed with the system and thus I'm wondering if there's a way to somehow isolate the whole "download dependencies packages and compile" process as I am only interested in the final wine binary. By isolating the compile process I can just copy the resulting binary and do a simple delete on the sandbox whereas doing it the naive way would require a more complex cleanup.

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• Projecting a targetting ring using direct3d

  - by JohnB

  I'm trying to draw a "targetting ring" on the ground below a "unit" in a hobby 3d game I'm working on. Basically I want to project a bright red patterned ring onto the ground terrain below the unit. The only approach I can think of is this - Draw the world once as normal Draw the world a second time but in my vertex shader I have the world x,y,z coordinates of the vertex and I can pass in the coordinates of the highlighted unit - so I can calculate what the u,v coordinates in my project texture should be at that point in the world for that vertex. I'd then use the pixel shader to pick pixels from the target ring texture and blend them into the previously drawn world. I believe that should be easy, and should work but it involves me drawing the whole visible world twice as it's hard to determine exactly which polygons the targetting ring might fall onto. It seems a big overhead to draw the whole world twice, once for the normal lit textured ground, and then again just to draw the targetting ring. Is there a better approach that I'm missing?

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• Selection of parameters in Diffie-Hellman

  - by allenzzzxd

  Hello, maybe it's not so proper to ask this question here... anyway, I'm trying to use the gmp library for the implementation of DH, but the problem here I got is: Once, when I was doing the tests to observe the output, although big values of prime and the private keys were selected: p was about more than 300 digits long in decimal a, b were about 100 digits long finally I got a shared secret key which was extremely small, perhaps smaller than 10^8 in decimal... This problem didn't show up many times, in fact, during all the observation, it appeared just once...but still, this was not so good at all. So I wonder if there are some methods which can avoid this... Thanx a lot

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• After the upgrading to 13.10, I can't input Japanese and Chinese in Emacs

  - by oda

  I have just upgraded Ubuntu from 13.04 to 13.10. It seems iBus have been made big changes.Then I just go to system setting - text entry settings - add "Chinese pinyin" and "Japanese anty" input method. It works well when I input Chinese or Japanese in terminal or .txt file. But when I want to input Chinese and Japanese in Emacs. Even though I have enable ibus-mode in the buffer and change to Chinese pinyin or Japanese anty input method. It just output the English word. Below is the ibus configure in .emacs.By the way, It works well before I upgrade Ubuntu to 13.10 and Emacs to 24.3.1. (add-to-list 'load-path (concat my-emacs-path "/ibus-el-0.3.2")) ;;(setq ibus-python-shell-command-name "python2.7") (require 'ibus) ;; Turn on ibus-mode automatically after loading .emacs (add-hook 'after-init-hook 'ibus-mode-on) (setq ibus-cursor-color '("red" "blue" "limegreen"))

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• What are the basics (best practices, etc) of writing a good Flash application?

  - by donut

  I've been tasked with writing a Flash application for facilitating a Fantasy Football draft pick. Normally, my choice would be to write this application in JavaScript. Unfortunately, it will require the use of sockets and since we don't have enough experience with Web Socket JS to be sure it would work in this situation I need to learn Flash. Currently, I'm most proficient in JavaScript/HTML/CSS/PHP/MySQL and have never really used Flash in a meaningful way. As best as I can I want to start this project off "the right way". So, what are good to know best practices and/or references/resources that will teach my the right way of doing things in Flash?

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• Are libc versions tied to kernel versions?

  - by mathematician1975

  After reading the answers to my previous question I have come to the conclusion that an answer to the following question is what I was actually looking for: Does a particular version of the kernel require a particular version of libc to run properly? Basically my problem stems from building an application on my 12.04 ubuntu and trying to run it on 8.04. I have since learned from this and other stackexchange forums that it is backward compatibility of libc that causes these problems. Therefore what I am perhaps naively trying to do is build the same version of libc that exists on my target and then link against that on my host when I build the application. Then in an ideal world when I copy this to the host, having been linked to the "correct" libc it should work (in my head at least). I have been totally unable to find a way to install an older libc on my system, and wondered if each version is tightly bound to a kernel version, hence the above question.

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• Flex Overwriting my .HTML wrapper

  - by brett

  When I make changes to a Flex project and rerun the project, it seems that FlashBuilder4 rewrites my html wrapper that embeds the SWF. But I have additional javascript code in the html wrapper and don't want to keep losing my code. I had to re-write the code once and it was a pain in the neck. How do I stop it from re-writing the html. And the related question: how do I stop it from deleting the html during a clean? I basically need to exclude the html from its processing once it's been created the first time. P.S. I'm using Flash Builder 4, but I suppose it's the same in Flex Builder 3.

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• When does "proper" programming no longer matter?

  - by Kai Qing

  I've been a full time programmer for about 8 years now. Web based mostly, ranging in weird jobs for clients. Never anything I "want" to do. So my experience is limited to what I've been contracted to do, having no real incentive to master anything in particular. So here's my scenario and ultimately what I wonder about... I've been building an android game in my spare time. It's using the libgdx library so quite a bit of the heavy lifting is done for me. I don't read much of the docs cause unless it's in tutorial format I will just not care, and ultimately most of my questions have already been asked on stackoverflow. I get along fine and my game works as expected... Suspiciously well, even. So much so that I wonder why one should bother to be "proper" when coding if the end result is ultimately the same. To be more specific, I used a hashtable because I wanted something close to an associative array. Human readable key values. In other places to achieve similar things, I use a vector. I know libgdx has vector2 and vector3 classes, but I've never used them. When I come across weird problems and search stackoverflow for help, I see a lot of people just reaming the questions that use a certain datatype when another one is technically "proper." Like using an ArrayList because it does not require defined bounds versus re-defining an int[] with new known boundaries. Or even something trivial like this: for(int i = 0; i < items.length; i ++) { // do something } I know it evaluates item.length on every iteration. I just don't care. I know items will never be more than 15 to 20 items. So why bother caring if I evaluate items.length on every iteration? So I wonder - why does everyone get all up in arms over this? Who cares if I use a less efficient datatype to get the job done? I ran some tests to see how the app performs using the lazy, get it done fast and don't look back method I just described versus the proper, follow the tutorial and use the exact data types suggested by the community. The results: Same thing. Average 45 fps. I opened every app on the phone and galaxy tab. Same deal. No difference. My game is pretty graphic intensive. It's not like it's just a simple thing. I expected it to perform kind of badly since I don't care to optimize image assets or... well, you probably get the idea. I'm making the game for fun. As a joke, really. But in doing so I'm working outside the normal scope of my job, which is to always follow the rules and do it the right way. So to say, I am without bounds here and this has caused me to wonder why I ever really care to be "proper" So I guess my question to you is this: Is there a threshold when it no longer matters to be proper? Is there a lasting, longer term consequence to the lazy, get it done and don't look back route? Is it ok to say - "so long as it gets the job done, I don't care?" Disclaimer: When I program my game, I am almost always drunk. I do it to remember why I got into this stuff to begin with because the monotony of client based web work will make you hate being a programmer. I'm having a blast and my game is not crashing, tests well, performs well, looks good on all devices so far and has no noticeable negative impact on any of my testing devices. I expected failure because I was being so drunkenly careless with my code, but to my surprise, it had no noticeable impact. I am now starting to question the need to be careful. Help me regain the ability to care! ... or explain why it's not a bad thing to not care. Secondary disclaimer: I am aware of the benefits of maintainability. For myself and others. Agreed. But it's not like someone happening across my inefficient int[] loop won't know what it does. As an experienced programmer those kinds of things are just clear on sight. I document the complex stuff for myself knowing I was drunk and will probably need a reminder. Those notes would clarify any confusion for someone who might ever gaze upon my ridiculous game - though the reality is that either I maintain it myself or it fades into time. I'm ok with that. But if it doesn't slow the device down, or crash, then crossing the t's and dotting the i's might actually require more time than it's worth.

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• Fix for EF4 Profiler Issue Coming in next Cumulative Update

  - by Ajarn Mark Caldwell

  Hey!  What do you know?  Microsoft Connect really works! I was very happy this morning to open my email and find a notice from Umachandar on the SQL Programmability Team that they have created a fix for the Odd Profiler Results with EF4 issue that I wrote about last June.  Not only did I blog about it, but I logged an item to Connect with repro steps and sample code.  And now, they have announced that they have a fix for this problem and that it will be included in the next Cumulative Update for SQL Server 2008 R2. For those of you not running 2008 R2, or who prefer to wait for full Service Packs rather than install the latest Cumulative Updates, I also wrote about a workaround for the issue, as long as you do not require the Multiple Active Result Sets feature to be enabled. It is easy with Microsoft to get the feeling that you’re just shouting in the wind, and it is nice to get validation once in a while that they really are listening.

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