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• Using directory traversal attack to execute commands

  - by gAMBOOKa

  Is there a way to execute commands using directory traversal attacks? For instance, I access a server's etc/passwd file like this http://server.com/..%01/..%01/..%01//etc/passwd Is there a way to run a command instead? Like... http://server.com/..%01/..%01/..%01//ls ..... and get an output? EDIT: To be clear here, I've found the vuln in our company's server. I'm looking to raise the risk level (or bonus points for me) by proving that it may give an attacker complete access to the system

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• Accessing Java Connector Architecture (JCA) from a Non-Managed environment

  - by Paul Kuykendall

  Hi, We have been using a JCA to interface with a low-level network resource from within WebSphere, however we have a requirement to be able to access the same network resource externally from Tomcat (i.e. not in a managed environment). The network communication and protocol layouts is very verbose, so we would rather not copy/paste several thousand lines of code (and then have to maintain them separately). From reading the JCA spec, there is supposedly some support to execute the code in a non-managed environment (such as Tomcat). Unfortunately, I have no idea what the interfaces are supposed to do, or how to call them from outside a managed environment (the spec is pretty vague). Are there any implementation examples out there that show how to modify a JCA to be usable in a non-managed environment? Thanks!

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• Implementing an ActiveRecord before_find

  - by thaiyoshi

  I am building a search with the keywords cached in a table. Before a user-inputted keyword is looked up in the table, it is normalized. For example, some punctuation like '-' is removed and the casing is standardized. The normalized keyword is then used to find fetch the search results. I am currently handling the normalization in the controller with a before_filter. I was wondering if there was a way to do this in the model instead. Something conceptually like a "before_find" callback would work although that wouldn't make sense on for an instance level.

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• Switch role after connecting to database

  - by Chris Gow

  Is it possible to change the postgresql role a user is using when interacting with postgres after the initial connection? The database(s) will be used in a web application and I'd like to employ database level rules on tables and schemas with connection pooling. From reading the postgresql documentation it appears I can switch roles if I originally connect as a user with the superuser role, but I would prefer to initially connect as a user with minimal permissions and switch as necessary. Having to specify the user's password when switching would be fine (in fact I'd prefer it). What am I missing?

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• Legalities of programming companion Android apps

  - by honeal

  I'm interested in creating companion apps to several current Android apps and was curious if there is a legal issue with using their name and/or icons from the app. Like the companion app being called Angry Birds Companion or something and you were to use a picture of the level or one of the characters, etc (I'm simply pulling from thin air so don't judge the idea, just the question, please). I know there are Strategy guides to video games that use icons and names, but I'm assuming they have prior consent. Does anyone have any factual input on this?

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• Windows Service on NetworkService account can't access remote (shared) directory

  - by Aetius

  I'm trying to remotely access a shared folder with a Windows Service set to NetworkService account permissions. However, I get errors when I try to do this, e.g. Directory.Exists(servicePath) returns false, FileSystemWatcher doesn't recognize activity in the directory. If I change the service's account to LocalSystem, these methods work. I don't want to give the service root-level access, though. It seems to be a permissions problem, so how can I give the service permission to access the directory and monitor it?

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• Is there any practical usage of Doubly Linked List, Queues and Stacks?

  - by Chouette

  I've been coding for quite sometime now. And my work pertains to solving real-world business scenarios. However, I have not really come across any practical usage of some of the data structures like the Linked List, Queues and Stacks etc. Not even at the business framework level. Of course, there is the ubiquitous HashTable, ArrayList and of late the List...but is there any practical usage of some of the other basic data structures? It would be great if someone gave a real-world solution where a Doubly Linked List "performs" better than the obvious easily usable counterpart.

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• Suggestions on including free database products to include in an application - SQL Server Express or

  - by superartsy

  I am working on an enterprise level product that is designed around SQL Server Express and specifically its features (views, concurrent users, stored procedures, CASE and IF statements). Though we don't use any advanced SQL Server features, the database size limit of 4GB in the Express edition may up being a limitation. A work-around is that customers can move to more full-featured versions of SQL Server. The problem is that SQL Server Express deployment is not easy, and the installer size is huge. This is a major drawback for someone looking to try our product. You don't want end-users to not buy a product because the download is huge. Does anyone have any recommendations of a database that has a smaller footprint but all the features of Express and which can be migrated to express?

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• Can I get parameter names/values procedurally from the currently executing function?

  - by Pwninstein

  I would like to do something like this: public MyFunction(int integerParameter, string stringParameter){ //Do this: LogParameters(); //Instead of this: //Log.Debug("integerParameter: " + integerParameter + // ", stringParameter: " + stringParameter); } public LogParameters(){ //Look up 1 level in the call stack (if possible), //Programmatically loop through the function's parameters/values //and log them to a file (with the function name as well). //If I can pass a MethodInfo instead of analyzing the call stack, great. } I'm not even sure what I want to do is possible, but it would be very nice to be able to automatically output parameter names/values at runtime to a file without explicitly writing the code to log them. Thanks!

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• .NET CF 2.0: Stream implements IDisposable ... kind of?

  - by mvanbem

  I've run into something odd in a .NET CF 2.0 project for Pocket PC 2003 (Visual Studio 2005). I was dealing with a System.IO.Stream object and found that the IDE wouldn't auto-complete the Dispose() method. I typed it in manually and received: 'System.IO.Stream.Dispose(bool)' is inaccessible due to its protection level The error is referring to the protected Dispose(bool) method. Dispose() is either private or not present. Question 1: How is this possible? Stream implements IDisposable: public abstract class Stream : MarshalByRefObject, IDisposable ... and IDisposable requires a Dispose() method: public interface IDisposable { void Dispose(); } I know the compiler won't let me get away with that in my code. Question 2: Will I cause problems by working around and disposing my streams directly? IDisposable idisp = someStream; idisp.Dispose(); The implicit cast is accepted by the compiler.

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• Books/resources for help with extracting useful feedback from clients?

  - by Eric

  I'm a web application developer looking for a book or something similar that can help with effectively communicating with clients who have a very vague or unrealistic idea of what they'd like out of the work I'm doing. Some fictional, though not by much, examples of situations: Clients who are not familiar with using the Internet, and insist on features that are not even remotely feasible (ex. time travel) Clients who are unable to express accurately what they're looking for (ex. "I know that's what I said and signed off on, but it's not what I meant") Clients who refuse to attend meetings or review sessions to answer questions or define requirements (which makes any agile development impossible) For the most part, I'm trying to find best practices for how to handle these kinds of things on a team-building level. The best ways to effectively address serious project roadblocks without sounding like a total jerk. Any recommendations for reading material on this topic?

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• Distributing cpu-bound compression jobs to multiple computers?

  - by barnaby

  The other day I needed to archive a lot of data on our network and I was frustrated I had no immediate way to harness the power of multiple machines to speed-up the process. I understand that creating a distributed job management system is a leap from a command-line archiving tool. I'm now wondering what the simplest solution to this type of distributed performance scenario could be. Would a custom tool always be a requirement or are there ways to use standard utilities and somehow distribute their load transparently at a higher level? Thanks for any suggestions.

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• How to switch data pins on/off on parallel port?

  - by Matt

  I want to simply switch certain data pins on and off, so that they can control a set of relays. I'm not asking about the hardware bit (should be easy), but I don't know where to begin writing the software. I don't want a high level library that can send bytes to a device - I literally want to switch on/off certain pins. I'm running Linux and I want to do this in Java, so would I just need a library? It would be nice if the library has good documentation and is easy to use, but if not then a short example code will help me get started.

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• Firefox 17.0.1 ignoring font-weight

  - by jphogan

  http://iamsinc.com/blog/new-producer-bonus/ For some reason Firefox 17.0.1 on my Windows 7 machine is ignoring the font-weight of the td elements. It should be normal. This works fine in Chrome, IE 7 8, & 9, but not in FF. I have also tested it on an XP machine running 17.0.1 and it works fine. The font-weight should be normal, not bold. In the second box down ($300k level), the font-weight is showing up as bold on Win 7 FF 17.0.1 which pushes the pictures outside of the box. I have even tried reducing the font-weight waaay down and it has not effect on the problematic FF browser Does anybody have a solution or even a work-around? I hate to make the pictures all smaller just to work around this. Thanks!

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• Becoming better at Vim

  - by Autopulated

  I've been using Vim for quite a long time, but I'm at a level where I use insert mode most of the time, and I still use the arrow keys to move around(!). I feel like I'm not getting the best out of my lovely editor, particularly regarding navigating (especially code), copy & pasting, and doing other manipulations of existing code. (though I am quite comfortable with complicated search/replace patterns). How should I go about learning more? What resources would people recommend?

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• singleton pattern in java- lazy Intialization

  - by flash

  public static MySingleton getInstance() { if (_instance==null) { synchronized (MySingleton.class) { _instance = new MySingleton(); } } return _instance; } 1.is there a flaw with the above implementation of the getInstance method? 2.What is the difference between the two implementations.? public static synchronized MySingleton getInstance() { if (_instance==null) { _instance = new MySingleton(); } return _instance; } I have seen a lot of answers on the singleton pattern in stackoverflow but the question I have posted is to know mainly difference of 'synchronize' at method and block level in this particular case.

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• Case Sensitivity of Action Names in Struts 2

  - by IK

  Is there an easy way to make Struts 2 action names case insensitive? Currently I have the following action defined: <action name="printTest" class="MyClass" > <result name="error">/WEB-INF/jsp/error.jsp</result> <result name="input">/WEB-INF/jsp/test.jsp</result> <result name="success">/WEB-INF/jsp/test.jsp</result> </action> If the user types URL "/app/printtest.do" instead of "/app/printtest.do" this action is not executed. Other then mod_rewrite on the httpd level or something like that, the only option that I know about right now is simply adding the same exact action and changing the name to "printtest". Ideally it would be a simple config change to struts.xml

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• What are the differences in performance between synchronous and asynchronous JavaScript script loading?

  - by jasdeepkhalsa

  My question is simply: what are the differences in performance between synchronous and asynchronous JavaScript script loading? From what I've gathered synchronous code blocks the loading of a page and/or rest of the code from executing. This happens at two levels. First, at the level of the script actually loading, and secondly, within the JavaScript code itself. For example, on the page: Synchronous: <script src="demo_async.js" type="text/javascript"></script> Asynchronous: <script async src="demo_async.js" type="text/javascript"></script> And within a script: Synchronous: function a() {alert("a"); function b() {alert("b");}} Asynchronous (and self-executing): (function(a, function(b){ alert(b); }) { alert(a); }))(); So what really is the difference in performance from using these different loading methods and JavaScript patterns?

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• How to add Exception to route with :any in CodeIgniter?

  - by aslamdoctor

  In my project, have setup an admin panel under a folder inside controllers folder like this controllers/admin_panel/dashboard.php And when we open it like this, it loads dashboard controller default http://www.mysite.com/admin_panel Now I have added a page controller on root level to load the page content from database. So here I have some a setup of kind of CMS. To load the page controller, I have added a condition in routes as below $route[':any'] = "page"; But what it is doing now is, when I try to open admin_panel, it loads the page controller. So I want to add a kind of exception condition here like route any except admin_panel Any suggestions how can I achieve this ? Thanks in advance.

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• Are sessions modifiable by the client/user?

  - by Sev

  In my PHP Web-App I use sessions to store the user's data. For exmaple, if a user logs in, then an instance of the User class is generated and stored in a Session. I have access levels associated with each user to determine their privileges. Store the user in a session by: $_SESSION['currentUser'] = new User($_POST['username']); For example: if($_SESSION['currentUser'] -> getAccessLevel() == 1) { //allow administration functions } where getAccessLevel() is simply a get method in the User class that returns the _accesslevel member variable. Is this secure? Or can the client somehow modify their access level through session manipulation of some sort?

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• Targeting an iFrame once with jQuery

  - by user275074

  Hi, I have a series of frames (4) which are used in a page to create loading of dynamic content through Ajax calls. In each of these frames I target parent level elements and update them with there respective content e.g. $("#loadingGrid1",top.document).show(); $("#frameSkills",top.document).hide(); In jQuery is there a way to instead of targeting specific elements on the parent page multiple times, simply target the page once into a variable e.g. var parentPage=$('#frameSkills',top.document); And then use this variable to apply content like $(parentPage #loadingGrid1).hide() Hope I've explained what I'm after enough. Basically, I'm having to call "top.document" in every jQuery selector I make and it seems like a waste of energy.

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• Bash file descriptor leak

  - by Charles Duffy

  I get a file descriptor leak when running the following code: function get_fd_count() { local fds cd /proc/$$/fd; fds=( * ) # avoid a StackOverflow source colorizer bug echo "${#fds[@]}" } function fd_leak_func() { echo ">> Current FDs: $(get_fd_count)" read retval new_state < <(set +e; new_state=$(echo foo); retval=$?; printf "%d %s\n" $retval $new_state) } function parent_func() { while fd_leak_func; do :; done } parent_func Tested on both 3.2.25 and 4.0.28. Taking the while loop out of parent_func and running it at top level makes the problem go away. What's going on here? More to the point, are workarounds available?

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• How to edit files on the users file system from my web server?

  - by Abs

  Hello all, I am really looking for implementation advice as I have entered a new realm that I am not familiar with. At the simplest level, I would like to find a way that I can read/write to a users machine from my web server. For this to work, I think I will have to install some sort of "plugin" on the users machine which can receive (or poll?) the server for instructions. The above is the line of thought that I currently have, maybe using JAVA to do this. This needs to work on Linux, Mac and Windows OS. I am really looking for advice on the above, is it a good idea? Is there a better way of doing this? Is there something out there already that I can build on top of? I really appreciate all input and advice as this is something I have not done before. Thanks all

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• Is it worth migrating to NHibernate 2.x from NHibernate 1.2?

  - by Amitabh

  We are using nHibernate 1.2 in a system which is not performing good. Will there be some performance improvement if we migrate to latest version of nHibernate? Overall is it a good idea to migrate to the latest version of nHibernate? EDIT: I want to use following features to improve performance. 1. Second level cache. 2. Joined Table. 3. MultiQuery to batch queries.

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• Exclude subexpression from regex in c++

  - by wyatt

  Suppose I was trying to match the following expression using regex.h in C++, and trying to obtain the subexpressions contained: /^((1|2)|3) (1|2)$/ Suppose it were matched against the string "3 1", the subexpressions would be: "3 1" "3" "1" If, instead it were matched against the string "2 1", the subexpressions would be: "2 1" "2" "2" "1" Which means that, depending on how the first subexpression evaluates, the final one is in a different element in the pmatch array. I realise this particular example is trivial, as I could remove one of the sets of brackets, or grab the last element of the array, but it becomes problematic in more complicated expressions. Suppose all I want are the top-level subexpressions, the ones which aren't subexpressions of other subexpressions. Is there any way to only get them? Or, alternatively, to know how many subexpressions are matched within a subexpression, so that I can traverse the array irrespective of how it evaluates? Thanks

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