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  • What's the best way to block IP spoofing on a layer 3 switch?

    - by toupeira
    We're hosting Dedicated Servers and are currently using old 3com switches with IP-based ACLs. So each port has an ACL that allows all IP addresses assigned to this customer, and blocks everything else. But now 3com was bought by HP, and the follow-up model only supports basic ACL that aren't flexible enough to both allow certain IPs while blocking others. Looking at other switches in a similar price-range, we've found that most of them have similar problems or don't offer any ACL features at all. I assume this could also somehow be done with VLANs, but if I understand this correctly we'd still need some kind of ACL to actually specify the valid IP addresses for each port. What do you use to make sure your customers don't use unassigned IP addresses? Or what switches can you recommend that have flexible ACL functionality?

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  • Block SMTP connections from mail domains which don't themselves accept SMTP connection.

    - by bignose
    I'm administrating a mail service for a small business. Their mail host's internet connection is an ADSL service with a permanent IP address. Unfortunately, many misconfigured mail systems will happily deliver to this host, but, when the host attempts to send mail back (e.g. a bounce notice, or a normal response from someone), the original sender refuses to receive connections from this host. That misconfiguration makes their system a one-way mail sender, which is a problem. How can I configure Postfix on this customer's mail host to refuse SMTP sessions that declare a sender domain which itself refuses SMTP from this host? That is, if the SMTP client declares a domain that we can't make SMTP connections back to, then there's not much point accepting the incoming connection in the first place. I'm imagining a late check (after the low-cost checks to winnow most of the rubbish connections) that keeps the client on the other end while it attempts an SMTP client connection back to the declared domain of the sender. If that connection is rejected, the incoming one is also rejected. I'm also open to other suggestions for how this problem might be addressed (short of not using this mail host at all, which isn't an option).

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  • How to block this URL pattern in Varnish VCL?

    - by iTech
    My website is getting badly hit by spambots and scrappers, I am using Cloudflare but the problem still remains there. The problem is spambots accessing non-existing urls causing a lot of load to my drupal backend which goes all the way and bootstraps db just to serve a 404 error doc. I cant simply dish out non-drupal 404's for all page not found errors, as I need to have drupal catch them. Since, varnish is in front it can check if the bot is acting nice and asking for valid url - if not it servers them a 404 or 403. These bots are causing errors using this pattern : http://www.megaleecher.net/http:/www.megaleecher.net/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_Storage Now, pls. suggest a regex varnbisg VCL directive which catches this URL pattern and serves a 404 error from varnish, preventing it from reaching apache/drupal ?

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  • Do large corporations block jQuery content on web pages?

    - by Max Vernon
    We are currently redesigning our website. The company we've hired to do the redesign is advocating the use of jQuery to render the pages dynamically. Our SEO specialist is under the impression that many larger corporations may have jQuery blocked in their proxies to prevent their users from visiting sites like Facebook. Is this something you are aware of? Forgive me if this is off topic for SF.SE!

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  • Different font SIZES in a Text Editor, based on Script(Alphabet) type (ie. per Unicode Code-Block)

    - by fred.bear
    Some non-Latin-based scripts(alphabets) have more detail in their glyphs than do the Latin-based-script equivalents, and typically need a larger font to give the same degree of legibility (resolution-wise). Sometimes, both script types need to be present in the same file. Notepad++ allows different font SIZES (and colour, etc) courtesy of syntax-highlighting. This allows me to display larger-fonted non-Latin-based script in a // BIG-FONT comment. Although this has been quite handy for me in some situations, it is quite limited. A Word Processor can handle this scenario, but I'm not interested in that. I want a nice simple(?) plain(?) Text Editor to do it... on a per script-type basis... eg. mixing Latin-1 and Devanagari (and Mandarin, and ... Such a thing may not exits, but Notepad++ has shown that a simple(?) plain(?) Text Editor is capable of it. Does anyone know of such a Text Editor? ...Q. Why not a Word Processor? ...A. Because GCC and Python don't like that format! but UTF-8 is fine.

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  • How do I block my ISP from framing websites?

    - by PJB
    I've noticed recently, as of today, that all the websites I visit (except for a specific few sites such as Google) are all put into a frame. I'm not sure what the reason for this is, there are no ads displayed and everything appears normal. The only reason I found out is because the headers weren't loading correctly and none of the page titles showed up properly - I quickly checked the source code and saw that instead of the source of the page I was expecting to see, there was a single line with a frame. I first thought maybe somekind of trojan, but after going through various checks I've determined it's my ISP and/or somekind of Internet Registry (I traced the IP shown in the source code) What can be done to prevent this frame, short of using a VPN? I feel like I am being spied on. PS: I'm located in South Korea.

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  • Help with converting an XML into a 2D level (Actionscript 3.0)

    - by inzombiak
    I'm making a little platformer and wanted to use Ogmo to create my level. I've gotten everything to work except the level that my code generates is not the same as what I see in Ogmo. I've checked the array and it fits with the level in Ogmo, but when I loop through it with my code I get the wrong thing. I've included my code for creating the level as well as an image of what I get and what I'm supposed to get. EDIT: I tried to add it, but I couldn't get it to display properly Also, if any of you know of better level editors please let me know. xmlLoader.addEventListener(Event.COMPLETE, LoadXML); xmlLoader.load(new URLRequest("Level1.oel")); function LoadXML(e:Event):void { levelXML = new XML(e.target.data); xmlFilter = levelXML.* for each (var levelTest:XML in levelXML.*) { crack = levelTest; } levelArray = crack.split(''); trace(levelArray); count = 0; for(i = 0; i <= 23; i++) { for(j = 0; j <= 35; j++) { if(levelArray[i*36+j] == 1) { block = new Platform; s.addChild(block); block.x = j*20; block.y = i*20; count++; trace(i); trace(block.x); trace(j); trace(block.y); } } } trace(count);

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  • Suckerfish Menu Not Working. Nested UL not displaying block

    - by Brett
    I'm going out of my mind with this one. I'm trying to build a suckerfish css drop down menu. I have the first level working ok but I can't get the nested ul (under the Glossary tab) to display in block format and show my a background color. I've been at this for three days and I'm about to go crazy. If anyone can help I'd really appreciate it. You can see it here: www.brettlockhart.com/blast/ body { min-width:640px; margin:0px; padding:0px 40px 0px 40px; background-color:#eee; } /*Nav One styles*/ nav#navOne ul { width:100%; min-width:640px; height:25px; margin:0px auto; padding:0px; background-image:url(/blast/images/navOneBg.png); border-radius:0px 0px 8px 8px; text-align:right; float:right; } nav#navOne ul li { position:relative; display:inline; margin: 0px 0px 0px 10px auto; padding:3px 0px; border-left:1px #0b4c8f solid; line-height:23px; } nav#navOne ul li:last-child { margin-right:10px; } .arrowDown { margin: auto; font-family:Tahoma, Geneva, sans-serif; font-size:.7em; color:#FFF; padding: 0px 5px 0px 0px; } nav#navOne ul li a { margin: 0px auto; padding: 4px 10px 4px 15px; font-family:Tahoma, Geneva, sans-serif; font-size:.7em; color:#FFF; border-left:1px #5d9ee0 solid; text-decoration:none; line-height:23px; } /*Nav One rollover*/ nav#navOne ul li ul { display:none; background-image:none; } nav#navOne ul li:hover ul { display:block !important; } nav#navOne ul li:hover nav#navOne ul li ul li { background-color:#69C !important; left:0px; top:26px; z-index:10; } h1 { float:left; width:158px; text-indent:-9999px; background-image:url(/blast/images/logo.png); background-repeat:no-repeat; } #search { float:right; width:280px; margin:0px; padding:0px; } /*Nav Two styles*/ nav#navTwo h3 { display:inline; } nav#navTwo ul { width:100%; height:50px; margin:0 auto; padding:0px; border:1px solid red; clear:both; } nav#navTwo ul li { display:inline; border: 1px solid green; margin-top:20px; } <header> <nav id="navOne"> <ul> <li><a href="#">Sign In</a></li> <li><a href="#">Register</a></li> <li><a href="#">Print Page</a></li> <li id="glossary"><a href="#">Glossary</a> <ul> <li><a href="#">Item Placeholder</a></li> <li><a href="#">Item Placeholder</a></li> <li><a href="#">Item Placeholder</a></li> <li><a href="#">Item Placeholder</a></li> <li><a href="#">Item Placeholder</a></li> <li><a href="#">Item Placeholder</a></li> </ul> </li> <li><a href="#">Text Size: A A A</a></li> <li><a href="#">Select Your Location</a> <span class="arrowDown">&#x2C5;</span></li> </ul> </nav><!--/navOne--> <h1>Logo</h1> <div id="search"> <form action="?" method="get"> <fieldset> <input type="text" id="searchField"> <input type="submit" id="searchSubmit" value="Submit"> Search:<label for="radioHere">here</label> <input type="radio" id="radioHere" name="here" value="here"> <label for="radioWeb">the web</label> <input type="radio" id="radioWeb" name="the web" value="the web"> </fieldset> </form> </div><!--/search--> <nav id="navTwo"> <ul> <li><h3>Residential:</h3></li> <li>TV</li> <li>Internet</li> <li>Phone</li> <li>Pricing</li> <li class="navTwoSelected">Music</li> <li>Order</li> <li>Billing</li> <li>Support</li> <li>|</li> <li>Business</li> <li>About Us</li> </ul> </nav><!--/navTwo--> <nav id="navThree"> <ul> <li>Today</li> <li>Watch</li> <li>Surf</li> <li>Play</li> <li class="navThreeSelected">Listen</li> <li>Learn</li> <li>Local</li> </ul> <h3>Tools:</h3> <ul> <li>Webmail</li> <li>Account</li> <li>Billing</li> <li>Order Services</li> </ul> </nav><!--/navThree--> <nav id="navFour"> <h3>Your are here:</h3> <ul id="breadcrumbs"> <li>Residential ></li> <li>My Place ></li> <li>Listen ></li> <li class="currentPage">Music</li> </ul> </nav><!--/navFour--> </header>

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  • How to force a DIV block to extend to the bottom of a page, even if it has no content?

    - by Sir Psycho
    Hi, I'm trying to get the content div to stretch all the way to the bottom of the page but so far, its only stretching if theres actual content to display. The reason I want to do this is so if there isn't much content to display, the vertical border still goes all the way down. Here is my code <body> <form id="form1"> <div id="header"> <a title="Home" href="index.html" /> </div> <div id="menuwrapper"> <div id="menu"> </div> </div> <div id="content"> </div> and my CSS body { font-family: Trebuchet MS, Verdana, MS Sans Serif; font-size:0.9em; margin:0; padding:0; } div#header { width: 100%; height: 100px; } #header a { background-position: 100px 30px; background: transparent url(site-style-images/sitelogo.jpg) no-repeat fixed 100px 30px; height: 80px; display: block; } #header, #menuwrapper { background-repeat: repeat; background-image: url(site-style-images/darkblue_background_color.jpg); } #menu #menuwrapper { height:25px; } div#menuwrapper { width:100% } #menu, #content { width:1024px; margin: 0 auto; } div#menu { height: 25px; background-color:#50657a; } Thanks for taking a looksi

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  • Silverlight: How can I built an overview display block for any XAML?

    - by Ryan Bates
    Hi all, I am trying to create a generic "overview" control for any XAML. A good example of the desired effect would be on Google Maps or Bing maps: The main map zooms into some content, while a small "overview" block is docked to one of the map corners, showing the user where he/she is zoomed into. My content is all placed inside a <Canvas>, which can then be scaled and zoomed with transforms. While the user does this kind of navigation, I would like to give them a visual indication of where they are in the larger context of the content. I have tried to take a 'screenshot' of the XAML before the user starts navigating, i.e. create a WriteableBitmap wbImageData = new WriteableBitmap(TheCanvas, null); and then displaying it in an Image. Based on the user's scrolling and zooming activity, a Rectangle displays which part of the content is currently visible in the display area. This works OK-ish (still clunky), but the image has to be redone everytime the content changes. Is there a simple way to create this kind of preview, or does anyone know of a component that does it? Thanks!

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  • How can I create a DOTNET COM interop assembly for Classic ASP that does not sequentially block othe

    - by Alex Waddell
    Setup -- Create a simple COM addin through DOTNET/C# that does nothing but sleep on the current thread for 5 seconds. namespace ComTest { [ComVisible(true)] [ProgId("ComTester.Tester")] [Guid("D4D0BF9C-C169-4e5f-B28B-AFA194B29340")] [ClassInterface(ClassInterfaceType.AutoDual)] public class Tester { [STAThread()] public string Test() { System.Threading.Thread.Sleep(5000); return DateTime.Now.ToString(); } } } From an ASP page, call the test component: <%@ Language=VBScript %> <%option explicit%> <%response.Buffer=false%> <% dim test set test = CreateObject("ComTester.Tester") %> <HTML> <HEAD></HEAD> <BODY> <% Response.Write(test.Test()) set test = nothing %> </BODY> </HTML> When run on a windows 2003 server, the test.asp page blocks ALL OTHER threads in the site while the COM components sleeps. How can I create a COM component for ASP that does not block all ASP worker threads?

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  • How do I force a DIV block to extend to the bottom of a page even if it has no content?

    - by Vince Panuccio
    In the markup shown below, I'm trying to get the content div to stretch all the way to the bottom of the page but it's only stretching if there's content to display. The reason I want to do this is so the vertical border still appears down the page even if there isn't any content to display. Here is my code <body> <form id="form1"> <div id="header"> <a title="Home" href="index.html" /> </div> <div id="menuwrapper"> <div id="menu"> </div> </div> <div id="content"> </div> and my CSS body { font-family: Trebuchet MS, Verdana, MS Sans Serif; font-size:0.9em; margin:0; padding:0; } div#header { width: 100%; height: 100px; } #header a { background-position: 100px 30px; background: transparent url(site-style-images/sitelogo.jpg) no-repeat fixed 100px 30px; height: 80px; display: block; } #header, #menuwrapper { background-repeat: repeat; background-image: url(site-style-images/darkblue_background_color.jpg); } #menu #menuwrapper { height:25px; } div#menuwrapper { width:100% } #menu, #content { width:1024px; margin: 0 auto; } div#menu { height: 25px; background-color:#50657a; } Thanks for taking a look.

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  • Creating a tiled map with blender

    - by JamesB
    I'm looking at creating map tiles based on a 3D model made in blender, The map is 16 x 16 in blender. I've got 4 different zoom levels and each tile is 100 x 100 pixels. The entire map at the most zoomed out level is 4 x 4 tiles constructing an image of 400 x 400. The most zoomed in level is 256 x 256 obviously constructing an image of 25600 x 25600 What I need is a script for blender that can create the tiles from the model. I've never written in python before so I've been trying to adapt a couple of the scripts which are already there. So far I've come up with a script, but it doesn't work very well. I'm having real difficulties getting the tiles to line up seamlessly. I'm not too concerned about changing the height of the camera as I can always create the same zoomed out tiles at 6400 x 6400 images and split the resulting images into the correct tiles. Here is what I've got so far... #!BPY """ Name: 'Export Map Tiles' Blender: '242' Group: 'Export' Tip: 'Export to Map' """ import Blender from Blender import Scene,sys from Blender.Scene import Render def init(): thumbsize = 200 CameraHeight = 4.4 YStart = -8 YMove = 4 XStart = -8 XMove = 4 ZoomLevel = 1 Path = "/Images/Map/" Blender.drawmap = [thumbsize,CameraHeight,YStart,YMove,XStart,XMove,ZoomLevel,Path] def show_prefs(): buttonthumbsize = Blender.Draw.Create(Blender.drawmap[0]); buttonCameraHeight = Blender.Draw.Create(Blender.drawmap[1]) buttonYStart = Blender.Draw.Create(Blender.drawmap[2]) buttonYMove = Blender.Draw.Create(Blender.drawmap[3]) buttonXStart = Blender.Draw.Create(Blender.drawmap[4]) buttonXMove = Blender.Draw.Create(Blender.drawmap[5]) buttonZoomLevel = Blender.Draw.Create(Blender.drawmap[6]) buttonPath = Blender.Draw.Create(Blender.drawmap[7]) block = [] block.append(("Image Size", buttonthumbsize, 0, 500)) block.append(("Camera Height", buttonCameraHeight, -0, 10)) block.append(("Y Start", buttonYStart, -10, 10)) block.append(("Y Move", buttonYMove, 0, 5)) block.append(("X Start", buttonXStart,-10, 10)) block.append(("X Move", buttonXMove, 0, 5)) block.append(("Zoom Level", buttonZoomLevel, 1, 10)) block.append(("Export Path", buttonPath,0,200,"The Path to save the tiles")) retval = Blender.Draw.PupBlock("Draw Map: Preferences" , block) if retval: Blender.drawmap[0] = buttonthumbsize.val Blender.drawmap[1] = buttonCameraHeight.val Blender.drawmap[2] = buttonYStart.val Blender.drawmap[3] = buttonYMove.val Blender.drawmap[4] = buttonXStart.val Blender.drawmap[5] = buttonXMove.val Blender.drawmap[6] = buttonZoomLevel.val Blender.drawmap[7] = buttonPath.val Export() def Export(): scn = Scene.GetCurrent() context = scn.getRenderingContext() def cutStr(str): #cut off path leaving name c = str.find("\\") while c != -1: c = c + 1 str = str[c:] c = str.find("\\") str = str[:-6] return str #variables from gui: thumbsize,CameraHeight,YStart,YMove,XStart,XMove,ZoomLevel,Path = Blender.drawmap XMove = XMove / ZoomLevel YMove = YMove / ZoomLevel Camera = Scene.GetCurrent().getCurrentCamera() Camera.LocZ = CameraHeight / ZoomLevel YStart = YStart + (YMove / 2) XStart = XStart + (XMove / 2) #Point it straight down Camera.RotX = 0 Camera.RotY = 0 Camera.RotZ = 0 TileCount = 4**ZoomLevel #Because the first thing we do is move the camera, start it off the map Camera.LocY = YStart - YMove for i in range(0,TileCount): Camera.LocY = Camera.LocY + YMove Camera.LocX = XStart - XMove for j in range(0,TileCount): Camera.LocX = Camera.LocX + XMove Render.EnableDispWin() context.extensions = True context.renderPath = Path #setting thumbsize context.imageSizeX(thumbsize) context.imageSizeY(thumbsize) #could be put into a gui. context.imageType = Render.PNG context.enableOversampling(0) #render context.render() #save image ZasString = '%s' %(int(ZoomLevel)) XasString = '%s' %(int(j+1)) YasString = '%s' %(int((3-i)+1)) context.saveRenderedImage("Z" + ZasString + "X" + XasString + "Y" + YasString) #close the windows Render.CloseRenderWindow() try: type(Blender.drawmap) except: #print 'initialize extern variables' init() show_prefs()

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  • CakePHP requestAction and eval code

    - by Naveed
    Hi, I am using cakephp for my site. I have stored multiple blocks in database and trying to access the code with following syntax. foreach($blocks as $block){ if($block['Block']['position'] == 'left'){ $str = $block['Block']['value']; eval("\"echo $str\";"); } } And i m getting this error; : Undefined property: View::$requestAction [APP\views\layouts\home.ctp(60) : eval()'d code Your Help will be highly appreciated. Thanks,

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  • Java Thread - Synchronization issue

    - by Yatendra Goel
    From Sun's tutorial: Synchronized methods enable a simple strategy for preventing thread interference and memory consistency errors: if an object is visible to more than one thread, all reads or writes to that object's variables are done through synchronized methods. (An important exception: final fields, which cannot be modified after the object is constructed, can be safely read through non-synchronized methods, once the object is constructed) This strategy is effective, but can present problems with liveness, as we'll see later in this lesson. Q1. Is the above statements mean that if an object of a class is going to be shared among multiple threads, then all instance methods of that class (except getters of final fields) should be made synchronized, since instance methods process instance variables?

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  • Synchronizing access to an inner object's methods?

    - by user291701
    Suppose I have the following: public class Foo { private ReadingList mReadingList = new ReadingList(); public ReadingList getReadingList() { synchronized (mReadingList) { return mReadingList; } } } If I try modifying the ReadingList object in two threads, the synchronization above won't help me, right?: // Thread 1 foo1.getReadingList().setName("aaa"); // Thread 2 foo2.getReadingList().setName("bbb"); do I have to wrap each method I want synchronized like so: public class Foo { private ReadingList mReadingList = new ReadingList(); public synchronized void setReadingListName(String name) { mReadingList.setName(name); } public synchronized void setReadingListAuthor(String author) { mReadingList.setAuthor(author); } ... and so on for each method of ReadingList I want exposed and synched? I'd end up just writing wrapper methods for each method of ReadingList. Thanks

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  • changing the bg color of an active click function in jquery?

    - by pingpong
    basically i have this click function in jquery: (this is just a snippet, not full) $('.block').click(function(){ var id= $(this).attr('id'); i want to chnage the background color of the block that has been clicked only, assigned with the id i.e. $('.block').click(function(){ var id= $(this).attr('id'); $('.block').css('background-color','grey'); but where do i assign the id, so jquery knows, to only turn the clicked block into grey, not the others, cheers

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  • How can I find a URL called [link] inside a block of HTML containing other URLs?

    - by DrTwox
    I'm writing a script to rewrite Reddit's RSS feeds. The script needs to find a URL named [link] inside a block of HTML that contains other URLs. The HTML is contained in an XML element called <description>. Here are two examples of the <description> element from I need to parse and the [link] I would need to get. First example: <description>submitted by &lt;a href=&#34;http://www.reddit.com/user/wildlyinaccurate&#34;&gt; wildlyinaccurate &lt;/a&gt; &lt;br/&gt; &lt;a href=&#34;http://wildlyinaccurate.com/a-hackers-guide-to-git&#34;&gt;[link]&lt;/a&gt; &lt;a href="http://www.reddit.com/r/programming/comments/26jvl7/a_hackers_guide_to_git/"&gt;[66 comments]&lt;/a&gt;</description> The [link] is: http://wildlyinaccurate.com/a-hackers-guide-to-git Second example: <description>&lt;!-- SC_OFF --&gt;&lt;div class=&#34;md&#34;&gt;&lt;p&gt;I work a support role at a company where I primarily fix issues our customers our experiencing with our software, which is a browser based application written primarily in javascript. I&amp;#39;ve been doing this for 2 years, but I want to take it to the next level (with the long term goal being that I become proficient enough to call myself a developer). I&amp;#39;ve been reading &amp;quot;Javascript The Definitive Guide&amp;quot; by O&amp;#39;Reilly but I was wondering if any of you more experienced users out there had some tips on taking it to the next level. Should I start incorporating some PHP and Jquery into my learning? Side projects on my spare time? Any good online resources? Etc. &lt;/p&gt; &lt;p&gt;Thanks! &lt;/p&gt; &lt;/div&gt;&lt;!-- SC_ON --&gt; submitted by &lt;a href=&#34;http://www.reddit.com/user/56killa&#34;&gt; 56killa &lt;/a&gt; &lt;br/&gt; &lt;a href=&#34;http://www.reddit.com/r/javascript/comments/26nduc/i_want_to_become_more_experienced_with_javascript/&#34;&gt;[link]&lt;/a&gt; &lt;a href="http://www.reddit.com/r/javascript/comments/26nduc/i_want_to_become_more_experienced_with_javascript/"&gt;[4 comments]&lt;/a&gt;</description> The [link] is: http://www.reddit.com/r/javascript/comments/26nduc/i_want_to_become_more_experienced_with_javascript/

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  • Java threading problem

    - by Krt_Malta
    Hi! I'm using multiple threads in my application. Basically I have a combo box and upon selecting Inbox, p1 resumes and p2 is suspended and upon selecting Send, p2 starts and p1 stops. Below is the code (I'm sure it's not perfect) public void modifyText(ModifyEvent e) { if (combo.getText().equals("Inbox")) { synchronized(p2) { p2.cont = false; } table.removeAll(); synchronized(p1) { p1.cont = true; p1.notify(); } } else if (combo.getText().equals("Sent")) { synchronized(p2) { p1.cont = false; } table.removeAll(); synchronized(p1) { p2.cont = true; p2.notify(); } } } }); and for P1 and P2 I have this inside their while loops: synchronized (this) { while (cont == false) try { wait(); } catch (Exception e) { } } ... As it is it's now working (I'm a beginner to threads). On pressing Sent in the combo box, I get an IllegalStateMonitorException. Could anyone help me solve the problem plz? Thanks and regards, Krt_Malta

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  • mdadm: Win7-install created a boot partition on one of my RAID6 drives. How to rebuild?

    - by EXIT_FAILURE
    My problem happened when I attempted to install Windows 7 on it's own SSD. The Linux OS I used which has knowledge of the software RAID system is on a SSD that I disconnected prior to the install. This was so that windows (or I) wouldn't inadvertently mess it up. However, and in retrospect, foolishly, I left the RAID disks connected, thinking that windows wouldn't be so ridiculous as to mess with a HDD that it sees as just unallocated space. Boy was I wrong! After copying over the installation files to the SSD (as expected and desired), it also created an ntfs partition on one of the RAID disks. Both unexpected and totally undesired! . I changed out the SSDs again, and booted up in linux. mdadm didn't seem to have any problem assembling the array as before, but if I tried to mount the array, I got the error message: mount: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so dmesg: EXT4-fs (md0): ext4_check_descriptors: Block bitmap for group 0 not in group (block 1318081259)! EXT4-fs (md0): group descriptors corrupted! I then used qparted to delete the newly created ntfs partition on /dev/sdd so that it matched the other three /dev/sd{b,c,e}, and requested a resync of my array with echo repair > /sys/block/md0/md/sync_action This took around 4 hours, and upon completion, dmesg reports: md: md0: requested-resync done. A bit brief after a 4-hour task, though I'm unsure as to where other log files exist (I also seem to have messed up my sendmail configuration). In any case: No change reported according to mdadm, everything checks out. mdadm -D /dev/md0 still reports: Version : 1.2 Creation Time : Wed May 23 22:18:45 2012 Raid Level : raid6 Array Size : 3907026848 (3726.03 GiB 4000.80 GB) Used Dev Size : 1953513424 (1863.02 GiB 2000.40 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Update Time : Mon May 26 12:41:58 2014 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 4K Name : okamilinkun:0 UUID : 0c97ebf3:098864d8:126f44e3:e4337102 Events : 423 Number Major Minor RaidDevice State 0 8 16 0 active sync /dev/sdb 1 8 32 1 active sync /dev/sdc 2 8 48 2 active sync /dev/sdd 3 8 64 3 active sync /dev/sde Trying to mount it still reports: mount: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so and dmesg: EXT4-fs (md0): ext4_check_descriptors: Block bitmap for group 0 not in group (block 1318081259)! EXT4-fs (md0): group descriptors corrupted! I'm a bit unsure where to proceed from here, and trying stuff "to see if it works" is a bit too risky for me. This is what I suggest I should attempt to do: Tell mdadm that /dev/sdd (the one that windows wrote into) isn't reliable anymore, pretend it is newly re-introduced to the array, and reconstruct its content based on the other three drives. I also could be totally wrong in my assumptions, that the creation of the ntfs partition on /dev/sdd and subsequent deletion has changed something that cannot be fixed this way. My question: Help, what should I do? If I should do what I suggested , how do I do that? From reading documentation, etc, I would think maybe: mdadm --manage /dev/md0 --set-faulty /dev/sdd mdadm --manage /dev/md0 --remove /dev/sdd mdadm --manage /dev/md0 --re-add /dev/sdd However, the documentation examples suggest /dev/sdd1, which seems strange to me, as there is no partition there as far as linux is concerned, just unallocated space. Maybe these commands won't work without. Maybe it makes sense to mirror the partition table of one of the other raid devices that weren't touched, before --re-add. Something like: sfdisk -d /dev/sdb | sfdisk /dev/sdd Bonus question: Why would the Windows 7 installation do something so st...potentially dangerous? Update I went ahead and marked /dev/sdd as faulty, and removed it (not physically) from the array: # mdadm --manage /dev/md0 --set-faulty /dev/sdd # mdadm --manage /dev/md0 --remove /dev/sdd However, attempting to --re-add was disallowed: # mdadm --manage /dev/md0 --re-add /dev/sdd mdadm: --re-add for /dev/sdd to /dev/md0 is not possible --add, was fine. # mdadm --manage /dev/md0 --add /dev/sdd mdadm -D /dev/md0 now reports the state as clean, degraded, recovering, and /dev/sdd as spare rebuilding. /proc/mdstat shows the recovery progress: md0 : active raid6 sdd[4] sdc[1] sde[3] sdb[0] 3907026848 blocks super 1.2 level 6, 4k chunk, algorithm 2 [4/3] [UU_U] [>....................] recovery = 2.1% (42887780/1953513424) finish=348.7min speed=91297K/sec nmon also shows expected output: ¦sdb 0% 87.3 0.0| > |¦ ¦sdc 71% 109.1 0.0|RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR > |¦ ¦sdd 40% 0.0 87.3|WWWWWWWWWWWWWWWWWWWW > |¦ ¦sde 0% 87.3 0.0|> || It looks good so far. Crossing my fingers for another five+ hours :) Update 2 The recovery of /dev/sdd finished, with dmesg output: [44972.599552] md: md0: recovery done. [44972.682811] RAID conf printout: [44972.682815] --- level:6 rd:4 wd:4 [44972.682817] disk 0, o:1, dev:sdb [44972.682819] disk 1, o:1, dev:sdc [44972.682820] disk 2, o:1, dev:sdd [44972.682821] disk 3, o:1, dev:sde Attempting mount /dev/md0 reports: mount: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so And on dmesg: [44984.159908] EXT4-fs (md0): ext4_check_descriptors: Block bitmap for group 0 not in group (block 1318081259)! [44984.159912] EXT4-fs (md0): group descriptors corrupted! I'm not sure what do do now. Suggestions? Output of dumpe2fs /dev/md0: dumpe2fs 1.42.8 (20-Jun-2013) Filesystem volume name: Atlas Last mounted on: /mnt/atlas Filesystem UUID: e7bfb6a4-c907-4aa0-9b55-9528817bfd70 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 244195328 Block count: 976756712 Reserved block count: 48837835 Free blocks: 92000180 Free inodes: 243414877 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 791 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 RAID stripe width: 2 Flex block group size: 16 Filesystem created: Thu May 24 07:22:41 2012 Last mount time: Sun May 25 23:44:38 2014 Last write time: Sun May 25 23:46:42 2014 Mount count: 341 Maximum mount count: -1 Last checked: Thu May 24 07:22:41 2012 Check interval: 0 (<none>) Lifetime writes: 4357 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: e177a374-0b90-4eaa-b78f-d734aae13051 Journal backup: inode blocks dumpe2fs: Corrupt extent header while reading journal super block

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  • Microsoft Enterprise Library Caching Application Block not thread safe?!

    - by AlanR
    Good aftenoon, I created a super simple console app to test out the Enterprise Library Caching Application Block, and the behavior is blaffling. I'm hoping I screwed something that's easy to fix in the setup. Have each item expire after 5 seconds for testing purposes. Basic setup -- "every second pick a number between 0 and 2. if the cache doesn't already have it, put it in there -- otherwise just grab it from the cache. Do this inside a LOCK statement to ensure thread safety. APP.CONFIG: <configuration> <configSections> <section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </configSections> <cachingConfiguration defaultCacheManager="Cache Manager"> <cacheManagers> <add expirationPollFrequencyInSeconds="1" maximumElementsInCacheBeforeScavenging="1000" numberToRemoveWhenScavenging="10" backingStoreName="Null Storage" type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Cache Manager" /> </cacheManagers> <backingStores> <add encryptionProviderName="" type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Null Storage" /> </backingStores> </cachingConfiguration> </configuration> C#: using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Practices.EnterpriseLibrary.Common; using Microsoft.Practices.EnterpriseLibrary.Caching; using Microsoft.Practices.EnterpriseLibrary.Caching.Expirations; namespace ConsoleApplication1 { class Program { public static ICacheManager cache = CacheFactory.GetCacheManager("Cache Manager"); static void Main(string[] args) { while (true) { System.Threading.Thread.Sleep(1000); // sleep for one second. var key = new Random().Next(3).ToString(); string value; lock (cache) { if (!cache.Contains(key)) { cache.Add(key, key, CacheItemPriority.Normal, null, new SlidingTime(TimeSpan.FromSeconds(5))); } value = (string)cache.GetData(key); } Console.WriteLine("{0} --> '{1}'", key, value); //if (null == value) throw new Exception(); } } } } OUPUT -- How can I prevent the cache to returning nulls? 2 --> '2' 1 --> '1' 2 --> '2' 0 --> '0' 2 --> '2' 0 --> '0' 1 --> '' 0 --> '0' 1 --> '1' 2 --> '' 0 --> '0' 2 --> '2' 0 --> '0' 1 --> '' 2 --> '2' 1 --> '1' Press any key to continue . . . Thanks in advance, -Alan.

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  • Spring security request matcher is not working with regex

    - by Felipe Cardoso Martins
    Using Spring MVC + Security I have a business requirement that the users from SEC (Security team) has full access to the application and FRAUD (Anti-fraud team) has only access to the pages that URL not contains the words "block" or "update" with case insensitive. Bellow, all spring dependencies: $ mvn dependency:tree | grep spring [INFO] +- org.springframework:spring-webmvc:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-asm:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-beans:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-context:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-context-support:jar:3.1.2.RELEASE:compile [INFO] | \- org.springframework:spring-expression:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework:spring-core:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework:spring-web:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework.security:spring-security-core:jar:3.1.2.RELEASE:compile [INFO] | \- org.springframework:spring-aop:jar:3.0.7.RELEASE:compile [INFO] +- org.springframework.security:spring-security-web:jar:3.1.2.RELEASE:compile [INFO] | +- org.springframework:spring-jdbc:jar:3.0.7.RELEASE:compile [INFO] | \- org.springframework:spring-tx:jar:3.0.7.RELEASE:compile [INFO] +- org.springframework.security:spring-security-config:jar:3.1.2.RELEASE:compile [INFO] +- org.springframework.security:spring-security-acl:jar:3.1.2.RELEASE:compile Bellow, some examples of mapped URL path from spring log: Mapped URL path [/index] onto handler 'homeController' Mapped URL path [/index.*] onto handler 'homeController' Mapped URL path [/index/] onto handler 'homeController' Mapped URL path [/cellphone/block] onto handler 'cellphoneController' Mapped URL path [/cellphone/block.*] onto handler 'cellphoneController' Mapped URL path [/cellphone/block/] onto handler 'cellphoneController' Mapped URL path [/cellphone/confirmBlock] onto handler 'cellphoneController' Mapped URL path [/cellphone/confirmBlock.*] onto handler 'cellphoneController' Mapped URL path [/cellphone/confirmBlock/] onto handler 'cellphoneController' Mapped URL path [/user/update] onto handler 'userController' Mapped URL path [/user/update.*] onto handler 'userController' Mapped URL path [/user/update/] onto handler 'userController' Mapped URL path [/user/index] onto handler 'userController' Mapped URL path [/user/index.*] onto handler 'userController' Mapped URL path [/user/index/] onto handler 'userController' Mapped URL path [/search] onto handler 'searchController' Mapped URL path [/search.*] onto handler 'searchController' Mapped URL path [/search/] onto handler 'searchController' Mapped URL path [/doSearch] onto handler 'searchController' Mapped URL path [/doSearch.*] onto handler 'searchController' Mapped URL path [/doSearch/] onto handler 'searchController' Bellow, a test of the regular expressions used in spring-security.xml (I'm not a regex speciality, improvements are welcome =]): import java.util.Arrays; import java.util.List; public class RegexTest { public static void main(String[] args) { List<String> pathSamples = Arrays.asList( "/index", "/index.*", "/index/", "/cellphone/block", "/cellphone/block.*", "/cellphone/block/", "/cellphone/confirmBlock", "/cellphone/confirmBlock.*", "/cellphone/confirmBlock/", "/user/update", "/user/update.*", "/user/update/", "/user/index", "/user/index.*", "/user/index/", "/search", "/search.*", "/search/", "/doSearch", "/doSearch.*", "/doSearch/"); for (String pathSample : pathSamples) { System.out.println("Path sample: " + pathSample + " - SEC: " + pathSample.matches("^.*$") + " | FRAUD: " + pathSample.matches("^(?!.*(?i)(block|update)).*$")); } } } Bellow, the console result of Java class above: Path sample: /index - SEC: true | FRAUD: true Path sample: /index.* - SEC: true | FRAUD: true Path sample: /index/ - SEC: true | FRAUD: true Path sample: /cellphone/block - SEC: true | FRAUD: false Path sample: /cellphone/block.* - SEC: true | FRAUD: false Path sample: /cellphone/block/ - SEC: true | FRAUD: false Path sample: /cellphone/confirmBlock - SEC: true | FRAUD: false Path sample: /cellphone/confirmBlock.* - SEC: true | FRAUD: false Path sample: /cellphone/confirmBlock/ - SEC: true | FRAUD: false Path sample: /user/update - SEC: true | FRAUD: false Path sample: /user/update.* - SEC: true | FRAUD: false Path sample: /user/update/ - SEC: true | FRAUD: false Path sample: /user/index - SEC: true | FRAUD: true Path sample: /user/index.* - SEC: true | FRAUD: true Path sample: /user/index/ - SEC: true | FRAUD: true Path sample: /search - SEC: true | FRAUD: true Path sample: /search.* - SEC: true | FRAUD: true Path sample: /search/ - SEC: true | FRAUD: true Path sample: /doSearch - SEC: true | FRAUD: true Path sample: /doSearch.* - SEC: true | FRAUD: true Path sample: /doSearch/ - SEC: true | FRAUD: true Tests Scenario 1 Bellow, the important part of spring-security.xml: <security:http entry-point-ref="entryPoint" request-matcher="regex"> <security:intercept-url pattern="^.*$" access="ROLE_SEC" /> <security:intercept-url pattern="^(?!.*(?i)(block|update)).*$" access="ROLE_FRAUD" /> <security:access-denied-handler error-page="/access-denied.html" /> <security:form-login always-use-default-target="false" login-processing-url="/doLogin.html" authentication-failure-handler-ref="authFailHandler" authentication-success-handler-ref="authSuccessHandler" /> <security:logout logout-url="/logout.html" success-handler-ref="logoutSuccessHandler" /> </security:http> Behaviour: FRAUD group **can't" access any page SEC group works fine Scenario 2 NOTE that I only changed the order of intercept-url in spring-security.xml bellow: <security:http entry-point-ref="entryPoint" request-matcher="regex"> <security:intercept-url pattern="^(?!.*(?i)(block|update)).*$" access="ROLE_FRAUD" /> <security:intercept-url pattern="^.*$" access="ROLE_SEC" /> <security:access-denied-handler error-page="/access-denied.html" /> <security:form-login always-use-default-target="false" login-processing-url="/doLogin.html" authentication-failure-handler-ref="authFailHandler" authentication-success-handler-ref="authSuccessHandler" /> <security:logout logout-url="/logout.html" success-handler-ref="logoutSuccessHandler" /> </security:http> Behaviour: SEC group **can't" access any page FRAUD group works fine Conclusion I did something wrong or spring-security have a bug. The problem already was solved in a very bad way, but I need to fix it quickly. Anyone knows some tricks to debug better it without open the frameworks code? Cheers, Felipe

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