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• How to enable/disable authentication without password when executing commands as superuser?

  - by 44taka

  On a Fedora 19 system which I set up for somebody a while ago I noticed that no authentication is required when commands are executed as the superuser. So, for example, when running Yum Extender, configuring the firewall or running some command with sudo in the terminal, I am not asked to provide a password. (With graphical applications the authentication dialog pops up for a few milliseconds.) For better security I would like to disable this automatic (authentication-less) assumption of superuser privileges. I do not remember if or how I enabled this authentication without a password. I might have enabled it for convenience for the non-pro user of this machine, but did not do any "fancy" things (like editing config files) to do so. I did not edit the sudoer file. I just checked that. I might have checked a "Do not ask for password again" checkbox or something similar. Whatever I did, I would like to undo it and enforce authentication for superuser tasks again.

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• Does programmable hardware exist to allow hardware to be programmed by computers?

  - by agentbanks217

  I am a programmer and I have never really dealt with the hardware of anything, only software. I want to start building things that I can control from my computer using programming. My question is are there such devices on the market that have a programmable interface or API? For example, I want to build an automated window blinds opening/closing device, and I would like to be able to control it from my computer e.g. writing an app or some code to schedule them when to open and close. I would like to know if there are any devices that can be programmed to do that (the computer part)?

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• How can I disallow a user's scripts from accessing anything above their user folder?

  - by Jaxo

  This is probably an extremely simple question to answer for anybody who knows what they're doing, but I can't find any answers myself. I'm trying to set up a subdirectory for my good friend to test his PHP scripts on my (Apache) hosting plan. I don't want to let him access anything else on my server, however, for obvious reasons. His FTP login already leads him to the proper directory, which does not allow navigating any higher than it's root (mydomain.com/friend/). I would like the same behavior to be applied to any scripts, so he cannot simply <?php print_r(glob("../*")); ?> and view all my files. I'm thinking this can be done with an .htaccess file setting the DocumentRoot somewhere, but I can't have the file available for modification inside the user directory. Is this possible without majorly rewiring the web server? I've tried Googling all sorts of things to describe my problem, but without the proper terminology, all I get is "shared hosting" websites and people trying to sell me security packages.

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• How would you manage development between many Staging branches?

  - by Trip

  We have a Staging Branch. then we came out with a Beta branch for users to move whenever they wanted to from old Production branch to the new features. Our plan seemed simple, we test on Staging, when items get QA'd, they get cherry-picked and deploy to Beta. Here's the problem! A bug will discreetly make its way on to Beta, and since Beta is a production environment, it needs fixes fast and accurate. But not all the QA's got done. Enter Git hell.. So I find a problem on Beta. No sweat, its already been fixed on Staging, but when I go to cherry-pick the item over, Beta barely has any of the other pre-requisites of code to implement this small change. Now Beta has a little here and a little there, and I can't imagine it as a code base being as stable as Staging. What's more, is I'm dealing with some insane Git conflicts, and having to monkey patch a bunch of things to make up for what Beta hasn't caught up with Staging. Can someone polite or non-polite terms, tell me what we're doing wrong here as far as assembling this project? Any awesome recommendations or workarounds or alternatives to the system we came up with?

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• How can I keep the Windows 8 virtual keyboard from popping up?

  - by orbfish

  I am the unwilling recipient of Windows 8. Lenovo couldn't fix the new Windows 7 Ultrabook I bought, so they sent me a Yoga laptop, with touch-screen and Windows 8. Once I bought a start menu replacement, I don't mind Windows 8 too much - it's ugly, but most things work as well as Windows 7. But the thing that drives me crazy, endlessly, is the virtual keyboard popping up when I'm trying to do something else (well, just about anytime, since I almost never use it to type). It's like a giant Clippy that covers half the screen. I haven't figured out what causes it to pop up. It seems pretty random, and sometimes it goes away before I can even reach for the escape key. Sometimes it comes up when I'm typing, sometimes when my hands are nowhere near the keyboard. Sometimes several times a minute, sometimes not for hours. Any suggestions?

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• A lot of connections to port 6881 - some new attacks or what ?

  - by stoleto

  Ok so i am the admin of a small network with a web server and only the web server has a direct connection to the internet, the rest of the network are connecting through another place. I was inspecting the traffic on the server with tcpdump, and i found a LOT of connections from different IP addresses to port 6881. All ports on my machine are blocked except those who are really needed for a web server (like port 80), so i checked it out and confirmed that 6881 and the rest ports are in filtered(firewalled) state. Why all those ips are continuously trying to make connection to the server on port 6881 no matter it's not open at all ? Is this some new kind of attack or maybe there's some new exploit (maybe 0day?) for some service running on 6881 ? AFAIK on 6881 operate the bittorrent and similar, so really, what's the deal ? It would be nice if someone clarifies me some things.

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• How to keep track of user images when using a CDN? [closed]

  - by Programmer

  We are considering moving our user profile images from the local server to the Rackspace CDN (Cloud Files). However, how do you keep track of where each user's profile image is located on the CDN? Wouldn't you have to store the CDN URL for each user image in the local Database and query it every time you display a user image? Isn't that slower than accessing a user image directly on the local server which requires no such DB query to retrieve since you already know where it is stored based on the user's User ID? What if a user has an album of pics? How would you keep track of all those images that belong just to that one user? What about the order of those pics? In the case of the Rackspace CDN, we're looking at using a Container for each individual user to help keep things more logically organized, but we don't know what the best way to track all of it is since the CDN provides a seemingly random URL for each image. To make matters worse, you can't even delete a non-empty Container belonging to a user when they delete their account, you actually have to delete each object inside the Container one-by-one before deleting the Container itself. It doesn't end there, you can't even have nested Containers or "sub-folders", and you can't rename a file (you must copy it with a new name and delete the old one manually). It just sounds so incredibly more complicated then we thought it would be, and it certainly does not feel "intuitive" compared to local storage, so we don't know what to do. Please help.

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• Install correct libraries depending on 64/32 bit

  - by Rich

  I am using Bash to install a customised version of JBoss, and one of the things I would like to do is install the correct version of the Apache Portable Runtime, which is a native binary. This script could be run on both 32 and 64 bit versions of RHEL. What are my options for identifying which version of the APR to install? I think we only have 32bit and x64-based systems here. I would still like to identify i64 systems so that the script can refuse to install on that type of machine. I am aware of using uname -m and grepping /proc/cpuinfo to find out, but was wondering which approach others would recommend?

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• AR9485 wireless card loses ability to connect after hibernation

  - by DrewDiezel

  This has happened twice now, the first time it happened I just reinstalled Ubuntu. The only things that I've been messing with in terms of networking, have been restarting the network-manager service after I resume from hibernate (because it never works right after resume, but restarting the service fixes that), and changing my mac address with ifconfig wlan0 down && ifconfig wlan0 hw ether 11:22:33:44:55 && ifconfig wlan0 up. using tail | dmesg returns a bunch of attempts to connect, saying something like authenticating ... okay you're connected! now I'm going to just disconnect because I feel like it. (reason=3). Any ideas? If it helps maybe I'll add a picture of the tail|dmesg output later. My wireless drivers are as follows: Atheros AR9485 Wireless Network Adapter Hamachi Network Interface Microsoft Virtual Wifi Miniport Adapter Realtek PCIe GBE Family Controller VirtualBox Host-Only Ethernet Adapter Here is a pastebin of some terminal outputs that could help. Also, the reddit thread has a few answers, for anyone curious. It's located here. It is entirely possible that it's just my school wifi blocking out my laptop, and my home wifi sucks. Wifi does work at places other than my home and school, however my phone can connect to both places. Here is a pastebin of the results of the wireless-info script.

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• My computer is broken after recent update attempt to 14.04

  - by user317550

  So it all started on a day much like today, because it is today but that's not the point, when I got a notification telling me I haven't upgraded to 14.04. Not due to lack of trying, however. It offered to upgrade me itself. Now keep in mind, I've tried very hard to upgrade my is from 12.04 to 14.04. Many times, I believe, due to tinkering where there shouldn't be tinkering, my BIOS are messed up. So upgrading is essentially impossible, but I wasn't about to stop it from updating for me, thinking it didn't have too much to do with BIOS as it doesn't reboot until after. So I let it go about its business and some time later I look back at it, and my unity sidebar is gone, and anytime there's text on screen it shows as those box things. The real bottom line is that I want to know my options. All of them. I would love to be able to keep the stuff on my hard drive so a hard drive swap may be an option if you guys say that would work. I just need my computer back. Let me know if I left anything out. Peace! B^)

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• Using (embedding?) wireshark in a C application for sniffing

  - by happy_emi

  I'm writing a C/C++ application which needs (among other things) to sniff packets and save the output in a file. This file will be read and processed by wireshark after a few days, using a LUA script to do some other stuff. My question is for the sniffing part which must be provided by my application. I can see two ways to do this: 1) Fork the wireshark process in background (of course using the command line version) 2) Using wireshark as library: no forking but include stuff like "wireshark.h" and link against libwireshark.so, thus using function calls to do the sniffing. So far I haven't found any documentation about #2 and it seems that #1 is the "right way" to embed sniffing capabilities in my code. Do you think I'm doing he right thing? Does wireshark allow embedding as a library?

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• When to open source a project under development? [closed]

  - by QuasarDonkey

  Possible Duplicate: Is it OK to push my code to GitHub while it is still in early development? I've been working on a hobby project for a few months now; it's clocking in at over 15000 source lines of code. A number of people have expressed interest in joining development, and I have full intentions of going open source, since it would not be feasible for me to complete the project alone. I'm just not sure when to open-source it. For context, I've notice many successful open source projects, such as the Linux kernel, had considerable work done before they were open-sourced. In my case, I'd been planning on open-sourcing it after I complete all the underlying libraries and overall architecture. Is this a mistake; should I just release it right now? I'm worried that since certain critical underlying components haven't been finalized, if people build a large codebase around them, it will be very difficult to change or fix things later. On the other hand, it's a very large project that will require multiple developers to complete in a reasonable time. So when is the right time during development to go open source? Preferably, I'd like to hear from some folks who have started their own projects.

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• How to get around OS X Lion Server SMB "safe save"?

  - by borrrden

  First, there is this problem: http://support.apple.com/kb/TS4149 Which says that anything copied to os x server via smb will be "safe saved" and essentially chmod to 600. This is extremely annoying and counterproductive to having a share server... I did what the article said, but nothing has changed. It is very vague about how to actually set the ACL permissions, but I think I did that via Server.app - hardware - storage - edit permissions. I added (in addition to other things): Guests - Read & Write Others - Read & Write Actually every entry is read and write, but despite this...it is still chmod to 600 when I try to copy a file via SMB. Where else should I look to solve this madness? Alternatively, how can I get rid of this crappy SMB and put back the original SMB? I tried SMBUp but it just fails to start the service every time...

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• Ubuntu 12.04 login screen flickers. “Could not write bytes: broken pipes”

  - by Brayn

  I use Ubuntu 12.04 x64 with a dual-boot setup. Yesterday it worked fine but this morning when I attempted to boot it gets to the login screen and then it just flickers, alternating between the login screen and the console showing boot items (mainly Apache, the last one being "Battery status" although it's a desktop) all with [OK] status. The only error that I can see is: "Could not write bytes: broken pipes" on top of the screen. The only things I can think of that could cause this are: This morning I had a removable hdd plugged in during boot time, which I usually don't have Yesterday I've installed Dwarven Fortress that requires some x32 libraries so I've installed ia32 using synaptic. As far as I know this shouldn't brake the system but I didn't reboot yesterday so I can't be sure. I've tried booting in recovery mode and tried running the utils there but still no luck. I've ran out of ideas. Thanks. EDIT: Forgot to mention that all partitions have plenty of free space EDIT2: In the end I just reinstalled Ubuntu as time was of the essence.

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• Program to Queue Files for Copy/Move/Delete in linux?

  - by laliga

  I've search the net for Linux's answer to something like Teracopy (Windows)... but could not find anything suitable. The closest things i got are: Krusader. Mentioned in their features but indicated as 'not implemented yet'. MiniCopier. A java based app http://a.courreges.free.fr/projets/minicopier/minicopier-en.php rsync is not an option. Can someone recommend me a simple file copy tool that can queue files for copy/move/delete? Preferably if I can drag and drop from Nautilus. If something like this does not exist, can someone please tell me why? ...am I the only person that needs something like this?

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• Is it fair to not support IE or older browsers? [closed]

  - by XToro

  Possible Duplicate: So now Google has said no to old browsers when can the rest of us follow suit? Normally a SO browser but this question doesn't fit there, hopefully it fits here. I just want to ask from web designers' point of view if it's wrong to not care about supporting Internet Explorer or older browsers. The site I'm designing looks great in all browsers except IE9-. There are certain things that IE doesn't support or behave like other browsers; webkit stuff, some CSS styles, drop-and-drop files from OS etc etc, but it all works great in Safari, FireFox, Chrome etc. Should I be that concerned? I know there are several people that use IE, but it's limitations have just been causing me more work by having to come up with workarounds. From what I've read, many of the issues I've been having should be solved with IE10, but not everybody keeps up to date. I know of several people who are still using IE6! Again, I'm hoping this is the right place to ask a question like this, and if not, please point me to the right stack exchange site instead of just downvoting me. Thanks!

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• Connections to Cotendo CDN servers are unreliable

  - by user139050

  I've been having a lot of trouble viewing certain websites - Gawker Media, DeviantArt, etc. - and through further investigation they all appear to be using a CDN called Cotendo. On my machine, and only this one, connections reset themselves midway through the download most of the time. This is not browser-specific; even wget (Cygwin) is unable to download anything without retrying a few times. This happens inside virtual machines as well. Unfortunately, I'm pretty stumped on why this is happening. My hosts file is empty (except for a couple LAN-specific things) and I've checked a few different DNS servers, but I can't really think of anything else to try. Anyone have any ideas?

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• ID Badge Access System for Building with Active Directory Integration [closed]

  - by Alex

  I hope this is the right place for this question. So, we're looking into setting up a building access that uses badges or cards of some kind. I wanted to ask the users on here if they've had to do such setups and/or if they have recommendations? Is there maybe a system that integrates with Active Directory? I know one of the things our managers want to do is to be able to run reports on when people are entering the buildings. I'd appreciate any suggestions and thanks in advance!

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• nagios service check

  - by DRH

  I am new to nagios and we have a small issue I need to ask assistance with. Many of the machines that we monitor can go unresponsive for a bit when some very intensive cpu tasks are run. This makes nagios send warnings and alerts while these hosts are busy reporting things like 'ping timeout' or 'zombie processes' and even swap space warnings, but in actuality there is not a problem. Is there a way to configure nagios to not send such alerts, but check x number of times over a period of time and only then send an alert at the end of that time if the server in question has not recovered?. Looking at the commands.cfg file, I see entries like this: define command{ command_name check_local_swap command_line $USER1$/check_swap -w $ARG1$ -c $ARG2$ } How could I modify this example to accomplish what I want above. Thanks

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• What is the most effective approach to learn an unfamiliar complex program? [closed]

  - by bdroc

  Possible Duplicate: How do you dive into large code bases? I have quite a bit of experience with different programming languages and writing small and functional programs for a variety of purposes. My coding skills aren't what I have a problem with. In fact, I've written a decent web application from scratch for my startup. However, I have trouble jumping into unfamiliar applications. What's the most effective way to approach learning a new program's structure and/or architecture so that I can start attacking the code effectively? Are there useful tools for their respective languages (Python and Java are my two primary languages)? Should I be starting with just looking at function names or documentation? How do you veterans approach this problem? I find this has to be with minimal help from coworkers or contributors who are already familiar with the application and have better things to do than help me. I'd love to practice this skill in an open source project so any suggestions for starting points (maybe mildly complex) would be great too!

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• How should I implement multiple threads in a game? [duplicate]

  - by xerwin

  This question already has an answer here: Multi-threaded games best practices. One thread for 'logic', one for rendering, or more? 6 answers So I recently started learning Java, and having a interest in playing games as well as developing them, naturally I want to create game in Java. I have experience with games in C# and C++ but all of them were single-threaded simple games. But now, I learned how easy it is to make threads in Java, I want to take things to the next level. I started thinking about how would I actually implement threading in a game. I read couple of articles that say the same thing "Usually you have thread for rendering, for updating game logic, for AI, ..." but I haven't (or didn't look hard enough) found example of implementation. My idea how to make implementation is something like this (example for AI) public class AIThread implements Runnable{ private List<AI> ai; private Player player; /*...*/ public void run() { for (int i = 0; i < ai.size(); i++){ ai.get(i).update(player); } Thread.sleep(/* sleep until the next game "tick" */); } } I think this could work. If I also had a rendering and updating thread list of AI in both those threads, since I need to draw the AI and I need to calculate the logic between player and AI(But that could be moved to AIThread, but as an example) . Coming from C++ I'm used to do thing elegantly and efficiently, and this seems like neither of those. So what would be the correct way to handle this? Should I just keep multiple copies of resources in each thread or should I have the resources on one spot, declared with synchronized keyword? I'm afraid that could cause deadlocks, but I'm not yet qualified enough to know when a code will produce deadlock.

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• Role of OSI layers when we open a url in browser?

  - by user2715898

  I have searched on this topic a lot but I am not able to understand how and where OSI layers (Application, Presentation, Session, Transport, Network, Datalink, Physical) come into picture in the whole process of opening a webpage in browser. I have read this - http://stackoverflow.com/questions/2092527/what-happens-when-you-type-in-a-url-in-browser?lq=1 and I know all the functions of all the layers that are there in OSI model. Also, do we use OSI model or TCP/IP in the whole process? Basically I am having problem linking all the things together. And please forgive me if there are resources out there that explain this concept. You can definitely point to them.

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• Should I amortize scripting cost via bytecode analysis or multithreading?

  - by user18983

  I'm working on a game sort of thing where users can write arbitrary code for individual agents, and I'm trying to decide the best way to divide up computation time. The simplest option would be to give each agent a set amount of time and skip their turn if it elapses without an action being decided upon, but I would like people to be able to write their agents decision functions without having to think too much about how long its taking unless they really want to. The two approaches I'm considering are giving each agent a set number of bytecode instructions (taking cost into account) each timestep, and making players deal with the consequences of the game state changing between blocks of computation (as with Battlecode) or giving each agent it's own thread and giving each thread equal time on the processor. I'm about equally knowledgeable on both concurrency and bytecode stuff, which is to say not very, so I'm wondering which approach would be best. I have a clearer idea of how I'd structure things if I used bytecode, but less certainty about how to actually implement the analysis. I'm pretty sure I can work up a concurrency based system without much trouble, but I worry it will be messier with more overhead and will add unnecessary complexity to the project.

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• I am being paid very little(imo), how can I change this? [migrated]

  - by LagWagon

  I am a web developer with about 4 years of relevant work experience in my field. Recently, I went from making $30/hr working from home contracting for large companies to a full time job that only pays 40k/yr. The company I work for now is great, nice people, but a little behind the times. I joined on with very little experience in SQL development but they put me in charge of querying the DB and making reports right away, so I had to go in head first and pick up that skill right away. Which is great, I'm happy I learned more of that, and really make good time when doing SQL now. However, I'm now doing most of their advanced SQL stuff. The day I started, another employee who was running a MVC project based in Yii (which is the sole item that makes this company software) put in his two weeks. Two weeks later, I'm the only one who knows how to use, access, modify, or update this project. Its quite a large responsibility for an "entry level dev", no? I am doing highly advanced jQuery for them to modernize their forms, webpages, amongst other things, a skill that I would bet on few Entry levels being able to do as well as me. I may be wrong, but I feel that what I'm making now is not acceptable. We don't have reviews, ever, so I can't just wait for that.. so I was wondering.. do I sound justified in wanting to be paid more, and how can I make this happen?

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• D20 java engine

  - by javydreamercsw

  I'm trying to incorporate PCGen into my application to avoid recreating the wheel for D20 system. (Are there any other libraries out there?) In other words I would like to use PCGen as a library and do things like: CRUD characters (and all related information) Experience/level managements I don't need the GUI part of it just the information to pass to my application. This is a scenario I can think of: 1. Load available custom classes 2. Create a new Character/NPC 3. Transfer the stats to my system 4. Player keeps playing so I need to update experience 5. Save player in my system and recreate it later. I'm trying to start to create a character from PCClass with no luck. Looking at the code it seems it'll try to load it. I assume load from a file generated from the GUI. Is there a way of bypassing the GUI for all this? I was looking for a tutorial of some sorts without luck. I was able to figure out how to use the dice within PCGen but that's about it. Any ideas?

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