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• Is SYN flooding still a threat?

  - by Rob

  Well recently I've been reading about different Denial of Service methods. One method that kind of stuck out was SYN flooding. I'm a member of some not-so-nice forums, and someone was selling a python script that would DoS a server using SYN packets with a spoofed IP address. However, if you sent a SYN packet to a server, with a spoofed IP address, the target server would return the SYN/ACK packet to the host that was spoofed. In which case, wouldn't the spoofed host return an RST packet, thus negating the 75 second long-wait, and ultimately failing in its attempt to DoS the server?

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• Indentation control while developing a small python like language

  - by sap

  Hello, I'm developing a small python like language using flex, byacc (for lexical and parsing) and C++, but i have a few questions regarding scope control. just as python it uses white spaces (or tabs) for indentation, not only that but i want to implement index breaking like for instance if you type "break 2" inside a while loop that's inside another while loop it would not only break from the last one but from the first loop as well (hence the number 2 after break) and so on. example: while 1 while 1 break 2 'hello world'!! #will never reach this. "!!" outputs with a newline end 'hello world again'!! #also will never reach this. again "!!" used for cout end #after break 2 it would jump right here but since I don't have an "anti" tab character to check when a scope ends (like C for example i would just use the '}' char) i was wondering if this method would the the best: I would define a global variable, like "int tabIndex" on my yacc file that i would access in my lex file using extern. then every time i find a tab character on my lex file i would increment that variable by 1. when parsing on my yacc file if i find a "break" keyword i would decrement by the amount typed after it from the tabIndex variable, and when i reach and EOF after compiling and i get a tabIndex != 0 i would output compilation error. now the problem is, whats the best way to see if the indentation got reduced, should i read \b (backspace) chars from lex and then reduce the tabIndex variable (when the user doesn't use break)? another method to achieve this? also just another small question, i want every executable to have its starting point on the function called start() should i hardcode this onto my yacc file? sorry for the long question any help is greatly appreciated. also if someone can provide an yacc file for python would be nice as a guideline (tried looking on Google and had no luck). thanks in advance.

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• Grails , how do I get an object NOT to save

  - by user350325

  Hello I am new to grails and trying to create a form which allows a user to change the email address associated with his/her account for a site I am creating. It asks for the user for their current password and also for the new email address they want to use. If the user enters the wrong password or an invalid email address then it should reject them with an appropriate error message. Now the email validation can be done through constraints in grails, but the password change has to match their current password. I have implemented this check as a method on a service class. See code below: def saveEmail = { def client = ClientUser.get(session.clientUserID) client.email = params.email if(clientUserService.checkPassword(session.clientUserID , params.password) ==false) { flash.message = "Incorrect Password" client.discard() redirect(action:'changeEmail') } else if(!client.validate()) { flash.message = "Invalid Email Address" redirect(action:'changeEmail') } else { client.save(); session.clientUserID = null; flash.message = "Your email address has been changed, please login again" redirect(controller: 'clientLogin' , action:'index') } } Now what I noticed that was odd was that if I entered an invalid email then it would not save the changes (as expected) BUT if I entered the wrong password and a valid email then it would save the changes and even write them back into the database even though it would give the correct "invalid password" error message. I was puzzled so set break points in all the if/else if/else blocks and found that it was hitting the first if statement as expected and not hitting the others , so it would never come accross a call to the save() method, yet it was saved anyway. After a little research I came accross documentation for the discard() method which you can see used in the code above. So I added this but still no avail. I even tried using discard then reloading the client object from the DB again but still no dice. This is very frustrating and I would be grateful for any help, since I think that this should surely not be a complicated requirement!

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• What's the best NAME for "quick" Category you add to a file?

  - by Joe Blow

  So the other day I was sick of typing out repetetive addTarget:action:forControlEvents:s, and macros are only entertaining for so long, so I did this: @implementation UIControl (xx) -(void)addTarget:(id)target action:(SEL)action { [self addTarget:target action:action forControlEvents:UIControlEventTouchUpInside]; } @end *and simply added it at the top of the .m file in question. Works great of course, but notice the "xx".* What's the best thing to NAME a "quick" Category like this? Annoyingly, it appears you can not leave the xx blank - it would then become an "Extension" (which, incidentally, I don't understand at all). I was thinking maybe: a single underscore the name of the class again identically "quick" perhaps the name of the class in this file (as in "quick extra routines for UIControl in CherryBomb") - so it would be UIControl(CherryBomb), ie, remind you that these extra routines are handy for CherryBomb "x" your or your company's initials (use the same "quick" Category name everywhere) "ThisTextNeverUsedAnywhere" By the way, I've been assuming that Categories only happen in the files that see them (CherryBomb.m in the example) - they do not from then on apply app-wide. ie they only apply where you include the header file (UIControl+NattyStuff) or in the "quick" case only in the file to which one adds the text. (By the way ... it appears you do not actually need to include an interface for such a Category, i.e. you can omit... //you can actually get away without these lines... //#import <UIKit/UIControl.h> //@interface UIControl (x) //-(void)addTarget:(id)target action:(SEL)action; //@end ... that part and it works fine.) For people who love Categories, and who doesn't, what's the answer to this troubling question? What should you name a "quick" Category where the name is never going to be referenced again and is irrelevant? Is "_" a solution?

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• Can I interrupt javascript code and then continue on a keystroke?

  - by Brian Ramsay

  I am porting an old game from C to Javascript. I have run into an issue with display code where I would like to have the main game code call display methods without having to worry about how those status messages are displayed. In the original code, if the message is too long, the program just waits for the player to toggle through the messages with the spacebar and then continues. This doesn't work in javascript, because while I wait for an event, all of the other program code continues. I had thought to use a callback so that further code can execute when the player hits the designated key, but I can't see how that will be viable with a lot of calls to display.update(msg) scattered throughout the code. Can I architect things differently so the event-based, asynchronous model works, or is there some other solution that would allow me to implement a more traditional event loop? Am I making sense? Example: // this is what the original code does, but obviously doesn't work in Javascript display = { update : function(msg) { // if msg is too long // wait for user input // ok, we've got input, continue } }; // this is more javascript-y... display = { update : function(msg, when_finished) { // show part of the message $(document).addEvent('keydown', function(e) { // display the rest of the message when_finished(); }); } }; // but makes for amazingly nasty game code do_something(param, function() { // in case do_something calls display I have to // provide a callback for everything afterwards // this happens next, but what if do_the_next_thing needs to call display? // I have to wait again do_the_next_thing(param, function() { // now I have to do this again, ad infinitum } }

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• Increasing the screen resolution in Ubuntu 10.04

  - by Veera

  I'm running Ubuntu 10.04 edition on my Acer 5738Z laptop. The screen size of my laptop is about 15'' but the screen resolution in Ubuntu is stuck at 1366x768. I know that my monitor could give better resolution, because previously I was running Win XP and I was able to set higher resolution there. So, my questions here: How do I increase my screen resolution, here? As per the answer given to a related question, I tried to edit the xorg.conf file, but I couldn't find the file in the place /etc/x11/. Should I create this file? If I have to install screen drivers separately, where could I find it?

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• problem with evolutionary algorithms degrading into simulated annealing: mutation too small?

  - by Schnalle

  i have a problem understanding evolutionary algorithms. i tried using this technique several times, but i always ran into the same problem: degeneration into simulated annealing. lets say my initial population, with fitness in brackets, is: A (7), B (9), C (14), D (19) after mating and mutation i have following children: AB (8.3), AC (12.2), AD (14.1), BC(11), BD (14.7), CD (17) after elimination of the weakest, we get A, AB, B, AC next turn, AB will mate again with a result around 8, pushing AC out. next turn, AB again, pushing B out (assuming mutation changes fitness mostly in the 1 range). now, after only a few turns the pool is populated with the originally fittest candidates (A, B) and mutations of those two (AB). this happens regardless of the size of the initial pool, it just takes a bit longer. say, with an initial population of 50 it takes 50 turns, then all others are eliminated, turning the whole setup in a more complicated simulated annealing. in the beginning i also mated canditates with themselves, worsening the problem. so, what do i miss? are my mutation rates simply too small and will it go away if i increase them? here's the project i'm using it for: http://stefan.schallerl.com/simuan-grid-grad/ yeah, the code is buggy and the interface sucks, but i'm too lazy to fix it right now - and be careful, it may lock up your browser. better use chrome, even thought firefox is not slower than chrome for once (probably the tracing for the image comparison pays off, yay!). if anyone is interested, the code can be found here. here i just dropped the ev-alg idea and went for simulated annealing. ps: i'm not even sure about simulated annealing - it is like evolutionary algorithms, just with a population size of one, right?

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• Need help. HDD Failed

  - by jiewmeng

  i have a seagate 3.5" 500GB SATA2 HDD that i put in a USB case (vantec) that failed recently. symptoms: at first, it started except that attempts made to browse certain folders resulted in "Data Error (Cyclic Redundancy Check)". then when i tried restarting the hdd, then i got a RAW partition, and windows 7 said i need to format it. i also tried using a desktop to connect to the HDD directly using SATA, windows 7 stuck at "starting windows" for abt half hour b4 i gave up on it. in the BIOS, it seems to detect the HDD model correctly, something like STA3500xxx something like that i also tried using TestDisk as suggested by jaclaz on MSFN and it did not find any partitions what could i do now?

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• How to functionally generate a tree breadth-first. (With Haskell)

  - by Dennetik

  Say I have the following Haskell tree type, where "State" is a simple wrapper: data Tree a = Branch (State a) [Tree a] | Leaf (State a) deriving (Eq, Show) I also have a function "expand :: Tree a - Tree a" which takes a leaf node, and expands it into a branch, or takes a branch and returns it unaltered. This tree type represents an N-ary search-tree. Searching depth-first is a waste, as the search-space is obviously infinite, as I can easily keep on expanding the search-space with the use of expand on all the tree's leaf nodes, and the chances of accidentally missing the goal-state is huge... thus the only solution is a breadth-first search, implemented pretty decent over here, which will find the solution if it's there. What I want to generate, though, is the tree traversed up to finding the solution. This is a problem because I only know how to do this depth-first, which could be done by simply called the "expand" function again and again upon the first child node... until a goal-state is found. (This would really not generate anything other then a really uncomfortable list.) Could anyone give me any hints on how to do this (or an entire algorithm), or a verdict on whether or not it's possible with a decent complexity? (Or any sources on this, because I found rather few.)

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• SEAGATE Barracuda 7200.11 HDD not running

  - by Dane411

  After a huge research, I'm stuck at the beggining of getting my HDD data back. Whats happening to me is that in the moment when I plug the power wire to my external 1TB SEAGATE Barracuda 7200.11 ST31000333AS HDD Fw LC15, it makes the sound like it's spinning to almost full speed and then shuts down and spins up again, and so on. It's well known that those HDDs have a bad firmware that someday randomly fails. There are like 2 main problems identified, BSY (busy) state, and LBA0 error. Last time I connected it to power nothing happened, it didnt try to start at all, is it that so called bricked state? I guess my HDDs error is the first one, but I dont really know if what I described is that BSY state or not, neither I know how to check it. How could I know it? Thank you so much!

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• Covert uiiamge into string

  - by Warrior

  I am new iphone development.Is there any possibility to covert the uiimage into string and then once again back to image. - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img1 editingInfo:(NSDictionary *)editInfo { [[picker parentViewController] dismissModalViewControllerAnimated:YES]; NSData *data = UIImagePNGRepresentation(img1); NSString *str1; str1 = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; MyAppAppDelegate *appDelegate = (MyAppAppDelegate *) [[UIApplication sharedApplication] delegate]; [appDelegate setCurrentLink:str1]; EmailPictureViewController *email = [[EmailPictureViewController alloc] initWithNibName:@"EmailPictureViewController" bundle:nil]; [self.navigationController pushViewController:email animated:YES]; } so i can use delegate methods to tranfer the image from one view to another view. so i should convert the string once again to image and display it in another view. In Another view - (void)viewDidLoad { MyAppAppDelegate *appDelegate =(MyAppAppDelegate *) [[UIApplication sharedApplication] delegate]; str1 = [appDelegate getCurrentLink]; NSLog(@"The String %@",str1); NSData *aData; aData = [str1 dataUsingEncoding: NSASCIIStringEncoding]; NSLog(@"The String Data %@",aData); NSLog(@"Inside Didload3"); [imgview setImage:[UIImage imageWithData:aData]]; } But this doesn't work for me.Where do i go wrong.Is there any way to solve it?.Please help me out.Thanks.

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• Windows Login Failure

  - by Chris Bateson

  I'm getting an error in the Event Viewer, which is also generating a lot of Logon Failure messages on our syslog server. Pretty much stuck on how to resolve. EventID: 536 Logon Type: 3 Reason: The NetLogon component is not active This is for a Windows Server 2003 system. I have checked here We're using Shavlik Protect 9 to scan and deploy patches. Shavlik stores the credentials for the systems and uses those stored credentials to deploy patches. This system is able to scan and deploy to other systems on the network using those credentials and no errors are generated. When installing to the local system that Shavlik is physically on then this error is generated. Whats interesting is that it doesn't generate during a scan, and the patches install fine. We've contacted Shavlik to get the response that they are unable to help since it's a Microsoft error. Has anyone seen this?

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• After travelling back in Firefox history, javascript won't run.

  - by Patonza

  When I use the back button on Firefox to reach a previously visited page, scripts on that page won't run again. Is there any fix/workaround to have the scripts execute again when viewing the page the second time? Please note that I have tested the same pages on Google Chrome and Internet Explorer and they work as intended. Here are the files and the steps I used to test the problem: (navigate to 0.html, click to get to 1.html, back button) 0.html <html><body> <script type="text/javascript"> window.onload = function() { alert('window.onload alert'); }; alert('inline alert'); </script> <a href="1.html">Click Me!</a> </body></html> 1.html <html><body> <p>Go BACK!</p> </body></html>

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• IE9 HANGS: jquery based webapp hanging ONLY with IE9

  - by Daniele B

  I'm stuck on this issue since days... This is the site I'm talking about. It is a webapp which makes large use of backbone, visualsearch, jquery plugins. This website is not working at the moment with IE8, but it's fine that it works with IE9...if just it would! What happens is that the website hangs when loaded ONLY with IE9 and (this is bizarre!) if the profiler tool of IE9 developer tools is ON it doesn't!! It also happens to oher people (I was notified of that) so I'm pretty sure it's not an issue linked to my browser settings. It makes me think about an error which has something to do with delays, or iterative functions which, in presence of profiler, are forced to delay bte cycles and so to leave free time slots to other functions which render the page. I can update with more details if needed. thanks.

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• VMWare Converter recommendations

  - by Tank Szuba

  I have two Ghost 14 backups of my machine. One for the machine fully configured with apps after and XP install and one of the last update before i re-imaged it (it's XP, I re-image about once every six months). I recently wanted to try simply using my initial image in a virtual environment to do my testing that generally causes me to need to re-image. I used the VMWare converter to convert the Ghost images to a virtual machine to use in Virtual box but they fail to properly boot. They get stuck after the bios loads and windows begins loading. If I power down the machine and refire it it will go to the error screen in windows that asks if you would like to boot to a different mode. none selected make any difference. What are some possible errors I should look for in the conversion process or in my settings for the converter?

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• Newsletter send using AJAX to avoid PHP timeout

  - by simPod

  I need to send newsletters. I have already a PHP script that sends mass emails but it won't work for long as email database is growing because of PHP max script run time. So, to avoid it I came up with a solution: I would call my PHP script using AJAX in javascript and I will give it $_GET parameter with a count 20 so the script would sent only 20 emails. Than AJAX would receive success response, and call my script again and again till all emails are send. Is it possible? I'm asking because I have never seen such a solution so I'm wondering if it is real (It's kinda hard to implement this into my PHP framework so I'm asking experts here first) To sum it up here's a code skeleton: <script> var emailCount = 1000; //would get this from DB var runCount = 20; //number of emails sent in one cycle var from = 0; //start number function sendMail(){ if(from<emailCount){ jQuery.ajaxfunction({ path: 'script.php?from='+from+'&count='+runCount successFc: function(){ from+=runCount; sendMail(); } }) } } sendMail(); </script> So, are there any obstacles? Thanks a lot.

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• p7h55-m/usb3 blue screen ?

  - by winterwindz

  hi im not sure if this is the right place to ask but, i just build a new desktop for gaming. i3 530 2.93 GHz P7H55-M/USB3 Corsair Vengeance 4GB 1600MHz iGame Gtx 460 Win 7 32bit Huntkey X7 900W Everytime i start the computer it would run normally until the windows loading and will just stuck and hit the blue screen.i tried everypossible way to repair,restore the windows but nutin seems to be working. I'm not sure if its compatibility problem or Bios or even Ram,since the beep is a normal beep and will only blue screen when loading the windows. if anyone can help me id appriciate it. thx

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• Booting a GPT USB key on older BIOS laptop

  - by fonix232

  I have an old HP EliteBook 8530p, which does not support booting from GPT USB (GPT HDDs are fine though). Lately I had the wish to have a fast-to-start OS for browsing, smaller web tasks, etc., so I grabbed a ChromeOS build (latest one by ArnoldTheBat), flashed it on an 8GB flash drive, and popped it in. It did not boot, so I dug deeper and discovered that it actually is GPT, and cannot be converted to MBR. As my laptop does not support UEFI booting from USB (there's a really-really beta UEFI support in the BIOS, but as I said, it only supports GPT hard drives, not USB devices), I'm stuck. Is there any way of booting it, say, another flash drive with a specific boot loader/manager (e.g. Plop)?

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• how can i realize a video-wall on 3-9pc with vlc

  - by Luca

  hello! i have to create a videowall, from 3 to 9 monitor. every monitor as a pc. actually, i stream from a server 9 movies with different istances of VLC, but i could also play on every machine the relative video with a single player. there's no problem. the real problem is that i really dont know how to sync the videos on a LAN...unfortunately there is a NETSYNC module inside VLC wich is NOT working. here are some info about my setup: videowall from 3 to 9 monitor || from 3 to 9 pc, all with the same configuration || a gigabit router+switch for the "dedicated" LAN im really stuck in this situation, if anyone has an idea or just a completely different solution, please, share it with me! thanks a lot in advance! :)

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• What's the vbs code to schedule a task every time Windows starts up?

  - by Wing C. Chen

  I would like to know how to write up the vbs code to schedule a windows task to start a .exe program every time the Windows starts up. I found the following code online: strComputer = "." Set objWMIService = GetObject("winmgmts:" _ & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2") Set objNewJob = objWMIService.Get("Win32_ScheduledJob") errJobCreated = objNewJob.Create _ ("Notepad.exe", "********123000.000000-420", _ True , 1 OR 4 OR 16, , , JobID) Wscript.Echo errJobCreated But it only tells me how to schedule the task every on some specific days and hours. I thought of creating a windows service. However the following is the story why I must look for an alternative to it. I created a windows service with RunAsService for my java program wrapped with Janel. The Service worked fine when I first installed and started it. However, after restarting my windows xp, a dialog window poped out saying that my janel generated .exe file has crashed, with my RunAsService service kept on going. The service worked fine when I terminated the service and restarted it again manually. Nevertheless, the same crash happens over and over again every time I restart my Windows.

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• How to connect a remote IP Phone to our VOIP Network?

  - by Mistiry

  We have an IP phone system in our office, and about 8 VoIP phones running on the system. We have a remote worker, who is literally states away. We'd like to connect his phone to our VoIP network, so that he has a business phone and an extension to which we could transfer calls. I was thinking, although I don't know for sure, that a pair of Cisco routers could be used in some way to make this work. I imagine a VPN solution, where I have one router connected to the phone network and the other router connected to the remote phone. Then have a site-to-site VPN set up so that the remote router... And that's where I'm stuck. I know the remote router will need to use the DHCP server of the phone system. I've never set up something like this, so I am seeking the help of the community here. What is the best way to get this remote VoIP phone RELIABLY connected to our internal VoIP network?

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• How to Enable Ports 25 - 28 on a Cisco Catalyst 3750

  - by Jared Brown

  I am trying to enable ports 25 - 28 on my 28 port Catalyst 3750. These four ports are my fiber ports. I am using the following command to bring up that interface. interface range Gi1/0/25 - 28 That works and it dumps me in the config-if-interface prompt. This is where I get stuck. I just want to enable these four ports and have them be in VLAN1 and On just like ports 1 - 24. How do I do this?

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• Hyper-V Guests suddenly stopped working

  - by Anton Gogolev

  Hi! Here's my configuration: Windows Server 2008 R2 Standard as a host OS, and two guests VMs running the same exact OS. Yesterday, Trial Activation on all OSes has expired and quite naturally all machines shut down. I rearmed the host, but cannot log on to either guest VMs. From what I see, they start up normally (State is listed as Running) but CPU Usage seems to be stuck at 3% and when I connect to it all I see is black textmode screen with cursor blinking. One of my VMs has several snapshots, and when I revert back, it starts up normally. Moreover, "reference VM" (the one I cloned these two VMs from) starts up just normally. How can I troubleshoot this issue?

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• Is it possible to have zsh+keychain+tmux not ask for keys?

  - by Wayne Werner

  I'm using tmux and zsh, and I've recently been learning about ssh-agent and keychain. From the manpage for zsh, it says that it will source .zlogin only if the shell is, well, a login shell. Following advice I read, I stuck keychain --clear in my .zlogin, which worked perfectly. When I logged into the box I had to unlock my key. However, each time I create a new window in tmux, it clears/makes me re-add my key. This is a little annoying... but I can understand it if, in fact, each new tmux window is a login window. I haven't been able to find much help outside of the manpages on this topic. So is each new tmux window a login shell, or is there any way that I can make it not clear my keys only when I create a tmux window?

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• What is the PastryKit Framework?

  - by Kerrick

  I'm trying to find any information I can on the PastryKit Javascript Framework. It appears to be in use on the iPhone User Guide that is displayed on the iPhone itself in Mobile Safari, but I cannot find any documentation or API. If you want to see it in action, open Safari 4, set your user agent to iPhone 3 (In the Develop menu) and check out the guide. Overall, it seems to be a way to write an HTML/CSS/Javascript application that acts like a native iPhone app. When it comes to Javascript, I used the JS Beautifier on (what I assume to be) the framework file and it was over 3,400 lines! Beautified, (again what I assume to be) their implementation of it was over 1,200 lines. On the CSS side, I used Clean CSS on (again what I assume to be) the framework CSS, and it came out to over 700 lines. Their implementation was shy of 500. Does anybody have, or know where to find, any information, documentation, or APIs on PastryKit? Or, can anybody figure out how to implement it?

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