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  • Sendmail + m4 - problem converting mc files into cf

    - by zbigh
    Hi I'm currently trying to configure sendmail fo the first time and setup a mail server on a small embedded computer ( running a custom linux distribution ). I'm having an issue with the m4 macros: I'm trying to convert this: VERSIONID(`$Id: generic-linux.mc,v 8.1 1999/09/24 22:48:05 gshapiro Exp $') OSTYPE(linux)dnl DOMAIN(generic)dnl define(HELPFILE, `/etc/mail/helpfile') FEATURE(nouucp, `noscpecial') MAILER(local)dnl MAILER(smtp)dnl to sendmail.cf, but all the output I get when running m4 is: VERSIONID($Id: generic-linux.mc,v 8.1 1999/09/24 22:48:05 gshapiro Exp $) OSTYPE(linux)DOMAIN(generic) FEATURE(nouucp, noscpecial) MAILER(local)MAILER(smtp) Am I doing something wrong?

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  • Sendmail + m4 - problem converting mc files into cf

    - by zbigh
    Hi I'm currently trying to configure sendmail fo the first time and setup a mail server on a small embedded computer ( running a custom linux distribution ). I'm having an issue with the m4 macros: I'm trying to convert this: VERSIONID(`$Id: generic-linux.mc,v 8.1 1999/09/24 22:48:05 gshapiro Exp $') OSTYPE(linux)dnl DOMAIN(generic)dnl define(HELPFILE, `/etc/mail/helpfile') FEATURE(nouucp, `noscpecial') MAILER(local)dnl MAILER(smtp)dnl to sendmail.cf, but all the output I get when running m4 is: VERSIONID($Id: generic-linux.mc,v 8.1 1999/09/24 22:48:05 gshapiro Exp $) OSTYPE(linux)DOMAIN(generic) FEATURE(nouucp, noscpecial) MAILER(local)MAILER(smtp) Am I doing something wrong?

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  • How to implement a memory transaction scope in C#?

    - by theburningmonk
    Hi, we have a cache which I would like to put some transaction scopes around so that any process have to explicitly 'commit' the changes it wants to do to the cached objects and make it possible to rollback any changes when the process fails halfway as well. Right now, we're deep cloning the cached objects on get requests, it works but it's not a clean solution and involves a fair bit of maintenance too. I remember hearing about some MTS (memory transaction scope) solution on .NetRocks a while back but can't remember the name of it! Does anyone know of a good MTS framework out there? Alternatively, if I was to implement my own, are there any good guidelines/patterns on how to do this? Thanks,

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  • How to diagnose causes of oom-killer killing processes

    - by dunxd
    I have a small virtual private server running CentOS and www/mail/db, which has recently had a couple of incidents where the web server and ssh became unresponsive. Looking at the logs, I saw that oom-killer had killed these processes, possibly due to running out of memory and swap. Can anyone give me some pointers at how to diagnose what may have caused the most recent incident? Is it likely the first process killed? Where else should I be looking?

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  • Using Parallel Extensions with ThreadStatic attribute. Could it leak memory?

    - by the-locster
    I'm using Parallel Extensions fairly heavily and I've just now encountered a case where using thread locla storrage might be sensible to allow re-use of objects by worker threads. As such I was lookign at the ThreadStatic attribute which marks a static field/variable as having a unique value per thread. It seems to me that it would be unwise to use PE with the ThreadStatic attribute without any guarantee of thread re-use by PE. That is, if threads are created and destroyed to some degree would the variables (and thus objects they point to) remain in thread local storage for some indeterminate amount of time, thus causing a memory leak? Or perhaps the thread storage is tied to the threads and disposed of when the threads are disposed? But then you still potentially have threads in a pool that are longed lived and that accumulate thread local storage from various pieces of code the threads are used for. Is there a better approach to obtaining thread local storage with PE? Thankyou.

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  • Subclassing Satchmo's Category model, but then getting the error "'Manager' object has no attribute 'root_categories'"

    - by hellsgate
    I'm using Satchmo as part of a website I'm currently building. At the moment I'm trying add more functions to the Satchmo Category class, but obviously I'm not going to make any changes to the Satchmo files. So, I thought that subclassing the Category class would give me a new class which contains all the Satchmo Category properties and methods while allowing me to add my own. However, either Python subclassing doesn't work like that, or I am doing it wrong. Here is the code I'm using to subclass Category: from product.models import Category class MyCategory(Category): """ additional functions to pull data from the Satchmo store app """ One of the methods I can normally use from the Category class is: Category.objects.root_categories() however, when I try to access MyCategory.objects.root_categories() I get the following error: AttributeError: 'Manager' object has no attribute 'root_categories' Can anyone point me in the right direction for solving this?

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  • Tracking object entries when "playing" a Windows Enhanced Metafile

    - by lzcd
    One of my current projects requires that I work out what colours are being used in an EMF file. I have been able to successfully whip up a file parser in C# that notes all references to colours... but haven't had any luck tracking which objects are in use across the entire file so I can apart colours that are referenced from colours that are used to paint on screen. The older style WMF files are easy as the object library starts at zero and one can simply track each "Create Object" style command... but EMF files are proving to be trickier as there seems to be preexisting entries in the library (if the "Select Object" commands I'm seeing are to be believed). Would anyone be able to either enlighten me on how to track objects in the library correctly with EMF files... or suggest an easier alternative to work out which colours are actually being used in the file (as opposed to just being defined)?

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  • Problem with Hyperic monitoring on CloudFoundry - frequent alerts

    - by Pavel P
    Hi, I'm running single instance CloudFoundry configuration with one web application. I turned on Hyperic monitoring with notification for case of web app unavailability. Now I randomly receive alert emails (Subject "An alert has been triggered - Deployment myapp - context unavailable") that the application is not running, but it obviously is running fine. In access log of Apache I see two requests every 15 seconds: 127.0.0.1 - - [17/Mar/2010:15:37:33 +0100] "GET /server-status?auto HTTP/1.1" 200 438 "-" "Jakarta Commons-HttpClient/3.1" 127.0.0.1 - - [17/Mar/2010:15:37:33 +0100] "GET /myapp HTTP/1.1" 200 - "-" "Jakarta Commons-HttpClient/3.1" At the time when I get the alert emails, everything in log still seems to be fine - two requests. Do you have idea what could be wrong? Did anybody have this kind of problem and solve it? Thanks, P

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  • Using a Loader for a string of QML

    - by Robbert
    In Qt 5.3 I've been using the Loader QML element for loading screens. Now I'm trying to load a string of QML dynamically. Qt.createQmlObject enables me to do so, but I can't seem to get the Loader element to play along. Seems like Loader only takes a URL (QUrl) or component (QQmlComponent), but Qt.createQmlObject creates an object (QObject). I'm new to QML, but from my understanding components are reusable elements, similar to classes, and objects are the instances of those classes. I thus can't seem to wrap my head around why Loader wouldn't work with objects. How can I show a loading screen while (asynchronously) parsing and initializing a string of QML? Example QML code: Item { Rectangle {id: content} Loader {id: loader} Component.onCompleted: { var obj = Qt.createQmlObject('import QtQuick 2.3; Rectangle {}', content); loader.source = obj; // Throws error. } }

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  • Nagios check for wuauserv on Windows Server 2008+

    - by Mechaflash
    From Windows Server 2008+, wuauserv is no longer a service that's ran all of the time and is instead ran as a scheduled task. I'm not sure of the exact behavior of how the scheduled task is created as it seems the schedule is generated and edited by another service. Prior to this, we setup nagios to just check for the running service to ensure it was accepting updates. My question is, how does one track the proper execution/running of wuauserv service in Windows Server 2008+ to ensure it is accepting updates with nagios?

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  • Python equivalent of Java's compareTo()

    - by astay13
    I'm doing a project in Python (3.2) for which I need to compare user defined objects. I'm used to OOP in Java, where one would define a compareTo() method in the class that specifies the natural ordering of that class, as in the example below: public class Foo { int a, b; public Foo(int aa, int bb) { a = aa; b = bb; } public int compareTo(Foo that) { // return a negative number if this < that // return 0 if this == that // return a positive number if this > that if (this.a == that.a) return this.b - that.b; else return this.a - that.a; } } I'm fairly new to classes/objects in Python, so I'd like to know what is the "pythonic" way to define the natural ordering of a class?

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  • Django Passing Custom Form Parameters to Formset

    - by Paolo Bergantino
    I have a Django Form that looks like this: class ServiceForm(forms.Form): option = forms.ModelChoiceField(queryset=ServiceOption.objects.none()) rate = forms.DecimalField(widget=custom_widgets.SmallField()) units = forms.IntegerField(min_value=1, widget=custom_widgets.SmallField()) def __init__(self, *args, **kwargs): affiliate = kwargs.pop('affiliate') super(ServiceForm, self).__init__(*args, **kwargs) self.fields["option"].queryset = ServiceOption.objects.filter(affiliate=affiliate) I call this form with something like this: form = ServiceForm(affiliate=request.affiliate) Where request.affiliate is the logged in user. This works as intended. My problem is that I now want to turn this single form into a formset. What I can't figure out is how I can pass the affiliate information to the individual forms when creating the formset. According to the docs to make a formset out of this I need to do something like this: ServiceFormSet = forms.formsets.formset_factory(ServiceForm, extra=3) And then I need to create it like this: formset = ServiceFormSet() Now how can I pass affiliate=request.affiliate to the individual forms this way?

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  • perl: Run remote perl script through SSH and query environment variables on remote machine

    - by kakyo
    I'm running a perl script through SSH, in the perl script I query environment variables using $ENV{MY_VAR_NAME} and it works fine when run locally. But through SSH, all environment variables become unset. I also tried to run system("source ~/.bash_profile"); at the beginning of my script to no avail. Any tips? EDIT: Rephrasing my question. I have machine A and B. I ran my perl on machine B, trying to get the environment variables on B and it worked. Then I ssh from A to B running the same script, i.e., using this code ssh user@B perl myscript.pl This time the environment variables on B are all blank. Any tips? UPDATE: I found that running the above script, ~/.bashrc on Machine B was invoked, but after setting environment variables in ~/.bashrc, run the above command again and still I don't see any environment variables. Also, if my perl script contains only echo $ENV{PATH} Then I get /usr/bin:/bin:/usr/sbin:/sbin

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  • Does Windows performance degrade past a certain level of CPU utilization?

    - by Mike Taylor
    Is there a recommended average CPU threshold in running Windows boxes based on experience in other shops? Background: We are running with Windows Server 2003 32-bit OS. Servers are handling a major enterprise-level web application suite with a high frequency of small transactions mixed in with much larger transactions - overall average is 13ms. Our average overall CPU utilization of the Windows servers are ~60% during prime-shift. And we question at what level does the Windows OS begin to shimmy on the CPU scheduling road? Thanks.

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  • Tracking upstream svn changes with git-svn and github?

    - by Joseph Turian
    How do I track upstream SVN changes using git-svn and github? I used git-svn to convert an SVN repo to git on github: $ git svn clone -s http://svn.osqa.net/svnroot/osqa/ osqa $ cd osqa $ git remote add origin [email protected]:turian/osqa.git $ git push origin master I then made a few changes in my git repo, committed, and pushed to github. Now, I am on a new machine. I want to take upstream SVN changes, merge them with my github repo, and push them to my github repo. This documentation says: "If you ever lose your local copy, just run the import again with the same settings, and you’ll get another working directory with all the necessary SVN metainfo." So I did the following. But none of the commands work as desired. How do I track upstream SVN changes using git-svn and github? What am I doing wrong? $ git svn clone -s http://svn.osqa.net/svnroot/osqa/ osqa $ cd osqa $ git remote add origin [email protected]:turian/osqa.git $ git push origin master To [email protected]:turian/osqa.git ! [rejected] master -> master (non-fast forward) error: failed to push some refs to '[email protected]:turian/osqa.git' $ git pull remote: Counting objects: 21, done. remote: Compressing objects: 100% (17/17), done. remote: Total 17 (delta 7), reused 9 (delta 0) Unpacking objects: 100% (17/17), done. From [email protected]:turian/osqa * [new branch] master -> origin/master From [email protected]:turian/osqa * [new tag] master -> master You asked me to pull without telling me which branch you want to merge with, and 'branch.master.merge' in your configuration file does not tell me either. Please name which branch you want to merge on the command line and try again (e.g. 'git pull <repository> <refspec>'). See git-pull(1) for details on the refspec. ... $ /usr//lib/git-core/git-svn rebase warning: refname 'master' is ambiguous. First, rewinding head to replay your work on top of it... Applying: Added forum/management/commands/dumpsettings.py error: Ref refs/heads/master is at 6acd747f95aef6d9bce37f86798a32c14e04b82e but expected a7109d94d813b20c230a029ecd67801e6067a452 fatal: Cannot lock the ref 'refs/heads/master'. Could not move back to refs/heads/master rebase refs/remotes/trunk: command returned error: 1

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  • Base-camp Style Subdomains and IDs of Models

    - by Newy
    I have an app that has Basecamp-style subdomains, that is, I have Projects, Users, Apples and Oranges. The Users, Apples and Oranges are all keyed to a Project and only exist in the http://project.myapp.com. I added a project_id to Users, Apples and Oranges and everything works, except of course that the ids of those three objects increment globally, and throughout my app I lookup objects by that id. This doesn't seem like best practice. Should I instead do lookups by a secondary key? How does that affect efficiency? If there's a good blog post that covers this, would be wesome.

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  • How to configure Apache to run in front of IIS (.net+php)

    - by Chris
    Hi So basically I have IIS6 running a .net application, running on port 80. What I want is to insert php code in this application. I found on a forum someone suggesting to run Apache+php in front of the IIS server so, like this, the .net code will be interpreted by the IIS server and after that the result will be passed to Apache that will interpret the php code. Is it possible? If yes then how to configure the Apache server? Thanks guys :)

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  • CPU Lockup when loading folder of bookmarks in Firefox

    - by Gary M. Mugford
    I am running Firefox 3.6 on WinXPSP3 on a duo Core machine with 4G of memory. I am also running Avast! free anti-virus and ZoneAlarm free firewall, both latest versions. Within the last month, my service provider basically forced me to upgrade to a Docsis 3.0 compliant modem (offered me a deal I couldn't turn down). At that point, I also upgraded to FF3.6. Basically, I am not unhappy with many aspects of this switchover, EXCEPT, when I now load a folder of bookmarks (anywhere from 10 to 38) I get nothing like the load times I experienced a couple of months back. It's taking minutes rather than seconds. And the first bookmark in one of the folders, GMail, rarely loads before timing out. I have used the old trick of powering off the cable modem before my day's work. This used to fix 'load-lag' in the old days. I have switched from my ISP's DNS server to Google, OpenDNS and back. And nothing seems to work currently. It's not my DNS cache. That's been flushed and secondary computers also have the same issue when loading folders. I have watched the CPU usage and loading the folder will send VSMon (ZoneAlarm) usage over 40 percent, AVastSvc (Avast!) over 30 and Firefox will then push the needle to 100. There's a brief burst by SVCHost when the others falter in devouring cycles. Then everything subsides to single digits once the last tab is loaded. The only other nominal nastiness is VSMon ALWAYS hitting 50 percent when ANY program starts downloading content from the internet. If I shutdown ZoneAlarm (and VSMon with it), the same slow loading takes place, but this time System is running 50% plus, again driving the usage to 100 per cent. I have my doubts FF3.6 vs FF3.5 is an issue, since the other computers are still running 3.5 and suffer the same issue. Those computers are on, but inactive, most of the time, being backups. Obviously, when the CPU hits 100, I can't do much of anything in FireFox OR in other programs. Video play through WMPC or VLC is extremely choppy, although it doesn't seem to affect the audio. Any ideas what I can try next? Thanks, GM

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  • How can I resolve this one application coming up with an "You don't have permission to use the application" error?

    - by morgant
    I've got a Mac OS X 10.6 Snow Leopard Server Open Directory Master with a user who's getting Mobility & Application managed preferences from a group (the only group they're a member of). The workstation is also running Mac OS X 10.6 Snow Leopard, when the user logs in and tries to run our primary application which they're explicitly allowed to run (via the group's preferences), it says "You don't have permission to use the application 'Blah'". Now, the application is added to the group's list of always allowed applications, unsigned (so a minor difference in application version or file contents shouldn't disallow it). It even lives in a subdirectory of /Applications which is in the list of folders to allow applications. I've run into this when logging this user into new workstations and the following usually works: Log them out Remove the following files from their mobile home folder on the workstation: /Library/Managed\ Preferences/, ~/.FileSync, ~/Library/Preferences/com.apple.finder.plist, and ~/Library/Preferences/com.apple.MCX.plist. Remove the following files from their network home folder on the server: ~/.FileSync, ~/Library/Preferences/com.apple.finder.plist, and ~/Library/Preferences/com.apple.MCX.plist. Log them back in on the workstation. However, this no longer resolves the issue. Their Home Sync preferences are set (on the group) to sync ~, but not the following files (manually, at login, and at logout... no background sync here): ~/.SymAVQSFile ~/NAVMac800QSFile ~/Library ~/.FileSync ~/.account Their Preferences Sync preferences are set (also on the group) to sync ~/Library & ~/Documents/Microsoft User Data, but not the following files (also manually, at login, and at logout... no background sync): ~/.SymAVQSFile ~/.Trash ~/.Trashes ~/Documents/Microsoft User Data/Entourage Temp ~/Library/Application Support/SyncServices ~/Library/Application Support/MobileSync ~/Library/Caches ~/Library/Calendars/Calendar Cache ~/Library/Logs ~/Library/Mail/AvailableFeeds ~/Library/Mail/Envelope Index ~/Library/Preferences/Macromedia/ ~/Library/Printers ~/Library/PubSub/Database ~/Library/PubSub/Downloads ~/Library/PubSub/Feeds ~/Library/Safari/Icons.db ~/Library/Safari/HistoryIndex.sk ~/Library/iTunes/iPhone Software Updates IMAP-* Exchange-* EWS-* Mac-* ~/Library/Preferences/ByHost ~/Library/Preferences/com.apple.dock.plist ~/Library/Preferences/com.apple.sitebarlists.plist ~/Library/Application Support/4D ~/Library/Preferences/com.apple.MCX.plist ~/.FileSync ~/.account Even with ~/Library/Preferences/com.apple.MCX.plist prevented from syncing during a Preferences Sync, it still seems to show up in the network home on the server frequently. Are there any other files other than ~/Library/Preferences/com.apple.MCX.plist that contain application Managed Preferences that might be causing this one app to be showing up as not allowed? Any ideas on how ~/Library/Preferences/com.apple.MCX.plist keeps getting sync'd back up the network home folder on the server? Update: I thought I had found a workaround this morning, but it also seemed to be extremely temporary. Basically, loking at /Library/Managed\ Preferences/[shortname]/com.apple.applicationaccess.new.plist I discovered that it didn't have an entry for the application in question, but /Library/Managed\ Preferences/[shortname]/complete.plist did. Naturally, I deleted com.apple.applicationaccess.new.plist, logged in again, and it worked... on one workstation. It failed on others, and after logging out & back in a couple more times it started failing on all of them again, even after further deletions of com.apple.applicationaccess.new.plist. Oddly, com.apple.applicationaccess.new.plist & complete.plist do both contain an entry for the application in question now, but it still says it's not allowed. Further Update: Okay, so I now have a reproducible workaround which seems to be required after every reboot of the workstation: Log in as the user (you'll discover you cannot launch the application in question). Fast User Switch to the local admin account on the workstation (we always have one on every machine). From that local admin account, run sudo mcxrefresh -n 'shortname' (logging out and back in as the user in question will not work). Fast User Switch back to the user (you'll still not be allowed to run the application). Log the user out and back in (you'll now be able to run the application in question.) Fast User Switch back to the local admin account, log it out, and log back in as the user in question. If you do all that exactly as described it'll keep working through log out & log back in, but NOT through a reboot. If, after a reboot, you try something like logging in as the local admin account, running sudo mcxrefresh -n 'shortname', logging out, then logging in as the user in question, it will NOT work. Yet Another Update We don't have any computer groups in our Open Directory, so it shouldn't be getting any conflicting settings from there. I ran sudo mcxquery -format xml -user shortname -group groupname before & after performing the aforementioned process to allow the application in question to be run and the results were identical (saved the result to files & diff'd... I'm not just guessing here). One Step Forward, Half a Step Back: When the Mac OS X 10.6.5 Server update was released, we upgraded our Open Directory Master to it as the changes included the following managed preferences fixes which I hoped might address this issue: Addresses an issue that could prevent managed preferences from being applied when a user logs in on a workstation that has been idle. Fixes an issue that could prevent administrators from bypassing client management settings on a workstation. This seemed to improve the situation slightly. The application in question now usually launches without error. If, and when it does launch with the "You don't have permission to use the application" error, logging the user out and back in seems to correct it. That said, we've since had to add a couple of applications to the user's ~/Applications/ directory and those are still prevented from launching. The workstations are running Mac OS X 10.6.4, the OD Master (which the workstations are bound to) is running Mac OS 10.6.5 Server (although there are two OD Replicas still running 10.6.4 Server), and we're using Workgroup Manager 10.6.3 (which is included with the Server Admin Tools 10.6.5 upgrade) to add the applications (unsigned, as always). This time, I've caught the following in /var/log/system.log when attempting to launch one of the allowed applications from ~/Applications: Dec 22 17:36:24 hostname parentalcontrolsd[43221]: -[ActivityTracker checkApp:csFlags:] [954:username] -- *** Incoming app appears to be masquerading as white listed app and failed signature validation: /Users/username/Applications/FileMaker Pro 5.5/FileMaker Pro.app/Contents/MacOS/FileMaker Pro. Note: This may be a valid app of a different version than what was whitelisted (on a different volume?) Dec 22 17:36:24 hostname [0x0-0xa42a42].com.filemaker.filemakerpro[43304]: launch of /Users/username/Applications/FileMaker Pro 5.5/FileMaker Pro.app/Contents/MacOS/FileMaker Pro was blocked Dec 22 17:36:24 hostname com.apple.launchd.peruser.1340[6375] ([0x0-0xa42a42].com.filemaker.filemakerpro[43304]): Exited with exit code: 255 Dec 22 17:36:24 hostname parentalcontrolsd[43221]: -[ActivityTracker(Private) _removeAppFromWhiteList:] [1362:username] -- *** Couldn't find local user record Running sudo mcxquery -format xml -user username -group groupname includes the following entry for FileMaker Pro 5.5 (and appears to include a full integration of the user's application whitelist & group's application whitelist): <dict> <key>bundleID</key> <string>com.filemaker.filemakerpro</string> <key>displayName</key> <string>FileMaker Pro</string> </dict> Note the lack of <key>appID</key><data> ... </data> which seems to specify a signed application. While whitelisted directories also appear to be correctly listed in the results, they too do not actually allow the applications to be run either. What is going on here?! Where else should I be looking?

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  • UIIMageView, warning: check_safe_call: could not restore current frame

    - by lukya
    Hi, I am changing the image in UIImageView based on accelerometer input. The images are stored in an array. The application runs fine for a while and then crashes. warning: check_safe_call: could not restore current frame I am not using "UIImage ImageNamed" method when populating the array. The total size of all images is around 12 Mb. But individual images are very light (<100 kb) and i am using only one image at a time from the array. Just in case there are any autoreleases, I have allocated a NSAutoreleasePool in view did load and am draining it in the didReceiveMemoryWarning method (which does get called 2, 3 times before the app crashes?). Following is the code that creates images array: //create autorelease pool as we are creating many autoreleased objects NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSMutableArray *finalarr = [[NSMutableArray alloc] initWithCapacity:9]; NSLog(@"start loading"); for(int y = 0; y < 100; y+=10) { NSMutableArray *arr = [[NSMutableArray alloc] initWithCapacity:10]; for(int x = 0; x < 10; x++) { NSString *imageName = [[NSString alloc] initWithFormat:@"0%d",y + x]; UIImage *img = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:imageName ofType:@"png"]]; [arr addObject:img]; [imageName release]; [img release]; } [finalarr addObject:arr]; [arr release]; } NSLog(@"done loading"); // Override point for customization after app launch viewController.imagesArray = finalarr; [finalarr release]; //retain the array of images [viewController.imagesArray retain]; //release the aurtorelease pool to free memory taken up by objects enqued for release [pool release]; As the app runs smoothly for a while, which means array creation is definitely not the problem. After this the following method is called from [accelerometer didAccelerate] -(BOOL)setImageForX:(int)x andY:(int)y { [self.imageView setImage:(UIImage*)[(NSArray*)[self.imagesArray objectAtIndex:y] objectAtIndex:x]]; return TRUE; } So the only code being executed is the "UIImageView setImage". But no objects are being created here. Please let me know if the code seems to have any leaks or i am doing something wrong. Thanks, Swapnil

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  • SQL Injection with Plain-Vanilla NHibernate

    - by James D
    Hello, Plain-vanilla NHibernate setup, eg, no fluent NHibernate, no HQL, nothing except domain objects and NHibernate mapping files. I load objects via: _lightSabers = session.CreateCriteria(typeof(LightSaber)).List<LightSaber>(); I apply raw user input directly to one property on the "LightSaber" class: myLightSaber.NameTag = "Raw malicious text from user"; I then save the LightSaber: session.SaveOrUpdate(myLightSaber); Everything I've seen says that yes, under this situation you are immune to SQL injection, because of the way NHibernate parameterizes and escapes the queries under the hood. However, I'm also a relative NHibernate beginner so I wanted to double-check. *waves hand* these aren't the droids you're looking for. Thanks!

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  • Making swap faster, easier to use and exception-safe

    - by FredOverflow
    I could not sleep last night and started thinking about std::swap. Here is the familiar C++98 version: template <typename T> void swap(T& a, T& b) { T c(a); a = b; b = c; } If a user-defined class Foo uses external ressources, this is inefficient. The common idiom is to provide a method void Foo::swap(Foo& other) and a specialization of std::swap<Foo>. Note that this does not work with class templates since you cannot partially specialize a function template, and overloading names in the std namespace is illegal. The solution is to write a template function in one's own namespace and rely on argument dependent lookup to find it. This depends critically on the client to follow the "using std::swap idiom" instead of calling std::swap directly. Very brittle. In C++0x, if Foo has a user-defined move constructor and a move assignment operator, providing a custom swap method and a std::swap<Foo> specialization has little to no performance benefit, because the C++0x version of std::swap uses efficient moves instead of copies: #include <utility> template <typename T> void swap(T& a, T& b) { T c(std::move(a)); a = std::move(b); b = std::move(c); } Not having to fiddle with swap anymore already takes a lot of burden away from the programmer. Current compilers do not generate move constructors and move assignment operators automatically yet, but as far as I know, this will change. The only problem left then is exception-safety, because in general, move operations are allowed to throw, and this opens up a whole can of worms. The question "What exactly is the state of a moved-from object?" complicates things further. Then I was thinking, what exactly are the semantics of std::swap in C++0x if everything goes fine? What is the state of the objects before and after the swap? Typically, swapping via move operations does not touch external resources, only the "flat" object representations themselves. So why not simply write a swap template that does exactly that: swap the object representations? #include <cstring> template <typename T> void swap(T& a, T& b) { unsigned char c[sizeof(T)]; memcpy( c, &a, sizeof(T)); memcpy(&a, &b, sizeof(T)); memcpy(&b, c, sizeof(T)); } This is as efficient as it gets: it simply blasts through raw memory. It does not require any intervention from the user: no special swap methods or move operations have to be defined. This means that it even works in C++98 (which does not have rvalue references, mind you). But even more importantly, we can now forget about the exception-safety issues, because memcpy never throws. I can see two potential problems with this approach: First, not all objects are meant to be swapped. If a class designer hides the copy constructor or the copy assignment operator, trying to swap objects of the class should fail at compile-time. We can simply introduce some dead code that checks whether copying and assignment are legal on the type: template <typename T> void swap(T& a, T& b) { if (false) // dead code, never executed { T c(a); // copy-constructible? a = b; // assignable? } unsigned char c[sizeof(T)]; std::memcpy( c, &a, sizeof(T)); std::memcpy(&a, &b, sizeof(T)); std::memcpy(&b, c, sizeof(T)); } Any decent compiler can trivially get rid of the dead code. (There are probably better ways to check the "swap conformance", but that is not the point. What matters is that it's possible). Second, some types might perform "unusual" actions in the copy constructor and copy assignment operator. For example, they might notify observers of their change. I deem this a minor issue, because such kinds of objects probably should not have provided copy operations in the first place. Please let me know what you think of this approach to swapping. Would it work in practice? Would you use it? Can you identify library types where this would break? Do you see additional problems? Discuss!

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  • linq to sql dynamic data modify object before insert and update

    - by Dan Tanner
    I'm using Dynamic Data and LINQ to SQL for some admin pages on a .NET 3.5 web app. All my admin tables a CreatedBy, CreatedDate, UpdatedBy, and UpdatedDate. I'm looking for a way to inject the setting of these properties before the objects are inserted and updated. I've seen an object_inserting hook if you have a linq to sql datasource in the web form, but I'm using dynamic data...is there an easy way to generically set that? And I've also looked at modifying each of the partial classes for my admin objects, but the closest hook I see is to implement the OnValidate method with the Insert action. Any suggestions? TIA.

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