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• Append message to JBoss Console using jboss-log4j.xml

  - by Random Joe

  I'm unable to append messages from my application to the JBoss console. The following are the changes that I made to the jboss-log4j.xml configuration file: <category name="com.tricubes"> <priority value="INFO"/> <appender-ref ref="CONSOLE"/> </category> Here is my code: public class OneToOneValidation2 { private static final Logger logger = Logger.getLogger("com.tricubes"); public boolean validate(byte[] fpImage, byte[] fpTemplate, String desc, String ticket) { ... logger.info("BES INFO: SOCKET MSG SENT " + intToByteArray(x)); ... return b; } } What am I missing? TIA!

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• How do I modify this download function in Python?

  - by TIMEX

  Right now, it's iffy. Gzip, images, sometimes it doesn't work. How do I modify this download function so that it can work with anything? (Regardless of gzip or any header?) How do I automatically "Detect" if it's gzip? I don't want to always pass True/False, like I do right now. def download(source_url, g = False, correct_url = True): try: socket.setdefaulttimeout(10) agents = ['Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)','Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.1)','Microsoft Internet Explorer/4.0b1 (Windows 95)','Opera/8.00 (Windows NT 5.1; U; en)'] ree = urllib2.Request(source_url) ree.add_header('User-Agent',random.choice(agents)) ree.add_header('Accept-encoding', 'gzip') opener = urllib2.build_opener() h = opener.open(ree).read() if g: compressedstream = StringIO(h) gzipper = gzip.GzipFile(fileobj=compressedstream) data = gzipper.read() return data else: return h except Exception, e: return ""

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• setting up a private network using linksys router

  - by user287745

  scenerio:- a database server running sql server 2005 and sql server management studio 2005 express editions a web server running IIS 5.0v using windows xp pro. two other computer having windows xp and windows 98 i have a linksys router which i use to access point for wireless (laptop) there are 5 sockets behind it four for clients and one for internet. i would like to setup a LAN- something like a private hosting area with two clients. would should i do? where to connect what and what would the changes in settnigs be. right now it uses dhcp or something to assign ips. where will the webserver be attached to the internet socket? where will the db server be attached? any guide, links, help thank you

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• Strange client's address returned throug accept(..) function.

  - by Negai

  Hi everyone, I'm a socket programming newbie. Here's a snippet: struct sockaddr_storage client_addr; ... client_addr_size = sizeof(client_addr); client_socket = accept( server_socket, (struct sockaddr *)&client_addr, &client_addr_size ); ... result = inet_ntop( AF_INET, &((struct sockaddr_in *)&client_addr)->sin_addr, client_addr_str, sizeof(client_addr_str) ); Whenever the client connects the address I get is 0.0.0.0 regardless from the host. Can anybody explain, what I'm doing wrong? Thanks.

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• Locking a file to verify a single execution of a service. How reliable?

  - by Camilo Díaz

  Hello, I am deploying a little service to an UNIX(AIX) system. I want to check if there is no active instance of that service running when starting it. How reliable is to implement that check like this? Try to acquire a lock on a file (w/ FileChannel) If succeeds, keep lock and continue execution If fails, exit and refuse to run the main body I am aware of software like the Tanuki wrapper, however, I'm longing for a simpler(maybe not portable) solution. Regarding PIDFILE(s): I want to avoid using them if possible, as I don't have administrative rights on the machine, neither knowledge in AIX's shell programming.

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• List hits per hour from a MySQL table

  - by Axel

  I am trying to work out the hits per hour from a database. Data basically is stored as follows (with other columns) : Table Name: Hits ============================ VisitorIP TIMESTAMP ---------------------------- 15.215.65.65 123456789 I want to display total hits per hour (within the last 6 hours ) including the hours that has no hits. Example of the output: // Assuming now : 21:00 21:00 - 0 hits 20:00 - 1 hits 19:00 - 4 hits 18:00 - 0 hits 17:00 - 2 hits 16:00 - 3 hits i would love to get the data as array, Please note that the stored date is in UNIX time stamp format. and there may be some hours without any hits! Thanks

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• Javascript / Flash : When exactly are flash external callback methods triggered ?

  - by felace

  I have a flash application using callbacks to javascript functions (eg. when it receives some data over a socket, it'll call a js script which would change the content of a div according to that given data). Afaik, there is no actual mutual exclusion in javascript so I'm not sure if I can/need to simulate something like : callbackFunc() { lock(mutex1) foo unlock(mutex1) } ... someOtherFunc() { lock(mutex1) bar unlock(mutex1) } So, the question is, when are those callbacks called ? Are they simply queued to be executed right after the browser finishes its task or are they triggered randomly ?

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• How to learn to program C the right way

  - by sfactor

  i have been programming in C/C++ for my academic courses a lot and was under the impression i had a pretty good grasp of it. but lately i had to work in a bluetooth application that had a server and client implementation in a Linux box and an embedded system. i learned bluez bluetooth API, socket/network programming and coded it. however i ran into a lot of problems with memory leaks and segmentation faults and other memory related errors along the way.as the code grew more complex i all but lost control of the pointers and threads and sockets. this got me wondering that i had a lot to learn that they didn't say in the basic C/C++ books. so i wanted to ask for the resources that are available that'll help be code better in a professional way in C/C++ .especially for the Linux/Mac environment (gcc compiler).

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• Best cross-platform solution for network server?

  - by Anonymous

  Hi, im starting a new project and for the first time i want to be cross-platform. But the tricky is my project would involve listen server, cryptos etc., etc. So i was wondering what is the best solution for cross-platform development (OpenSSL, instead of MSCrypto etc.) that would be easy to write with VS2010 (yeah the RC). The language is still not specified (depends on witch we would be easier) but im leaning to Visual C++. In Cross-Platform i mean windows/generic unix compilation.

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• Calculating a delta of years from a date

  - by Spiros

  I am trying to figure out a way to calculate the year of birth for records when given the age to two decimals at a given date - in Perl. To illustrate this example consider these two records: date, age at date 25 Nov 2005, 74.23 21 Jan 2007, 75.38 What I want to do is get the year of birth based on those records - it should be, in theory, consistent. The problem is that when I try to derive it by calculating the difference between the year in the date field minus the age, I run into rounding errors making the results look wrong while they are in fact correct. I have tried using some "clever" combination of int() or sprintf() to round things up but to not avail. I have looked at Date::Calc but cant see something I can use. p.s. As many dates are pre-1970, I cannot not unfortunately use UNIX epoch for this.

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• SocketAsyncEventArgs and buffering while messages are in parts

  - by Rob

  C# socket server, which has roughly 200 - 500 active connections, each one constantly sending messages to our server. About 70% of the time the messages are handled fine (in the correct order etc), however in the other 30% of cases we have jumbled up messages and things get screwed up. We should note that some clients send data in unicode and others in ASCII, so that's handled as well. Messages sent to the server are a variable length string which end in a char3, it's the char3 that we break on, other than that we keep receiving data. Could anyone shed any light on our ProcessReceive code and see what could possibly be causing us issues and how we can solve this small issue (here's hoping it's a small issue!) Code below:

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• Odd C interview question

  - by Brennan Vincent

  Hi guys. I found this problem on a site full of interview questions, and was stumped by it. Is there some preprocessor directive that allows one to read from standard input during compilation? Write a small C program, which while compiling takes another program from input terminal, and on running gives the result for the second program. (NOTE: The key is, think UNIX). Suppose, the program is 1.c Then, while compiling $ cc -o 1 1.c int main() { printf("Hello World\n"); } ^D $ ./1 Hello World

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• launch an app to record keep with greasemonkey

  - by acidzombie24

  I have my greasemonkey script scanning every page i visit for a specific string. I would like to recordkeep the variations of the string in a sqlite db. I'll have another app process this db everyonce in a while. What i dont know is HOW do i store the data into the sqlite db? i was thinking i can launch an executable automatically if the string was found but i dont know how to do that through javascript. Another alternative i thought was have a socket listen on a certain port and have some js magic but i couldnt think of a silent way to send data like that.

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• Which encoding (code page) is used for file names in ZIP archive under Mac OS x 10.6

  - by bao

  I have a zip library SharpZipLib which intended to work with ZIP archives using C#. It has parameter ICSharpCode.SharpZipLib.Zip.ZipConstants.DefaultCodePage which specifies encoding of file names in zip archive. I know that in Windows and in OSX different encodings are used to store file names. 1) Which encodings (code pages) are used in both? 2) How to determine programmatically which encoding is used? When I open in Win7 zip file packed under MacOS X, I see files with bad names (originally - cyrillic) and folder called __MACOSX, so I can say zip was prepared on Mac box. Any other way? What about other UNIX like systems?

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• Cannot import SQLite with Python 2.6

  - by David McLaughlin

  I'm running Python 2.6 on Unix and when I run the interactive prompt (SQLite is supposed to be preinstalled) I get: [root@idev htdocs]# python Python 2.6 (r26:66714, Oct 23 2008, 16:25:34) [GCC 3.2.2 20030222 (Red Hat Linux 3.2.2-5)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named sqlite >>> import sqlite Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named sqlite >>> How do I resolve this?

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• What is the best book in client server programming ?

  - by Nayef

  What is the best "new" book in client server programming with C#? I mean principles of inter-network architecture and communication protocols. Open systems and interoperability. Case studies of particular protocols from network layer and above. Socket programming. Remoting. Selected examples of networked client-server applications such as e-mail, news, file-transfer, HTTP. Client-Server Programming Project(s). Using APIs. Software tools and environments.

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• Sql CLR calling webservice throws exception

  - by TonyP

  I have clr stored procedure that calls a Webservice method. Webmethod in turn call a com object .. and do some processing on a remote Unix server. When I invoke webmethod by it self it works fine. But when called from the CLR I get the following exception.. What am I doing wrong ? Msg 6522, Level 16, State 1, Procedure PrintOa, Line 0 A .NET Framework error occurred during execution of user-defined routine or aggregate "PrintOa": System.Security.HostProtectionException: Attempted to perform an operation that was forbidden by the CLR host. The protected resources (only available with full trust) were: All The demanded resources were: Synchronization System.Security.HostProtectionException: at System.Reflection.MethodBase.PerformSecurityCheck(Object obj, RuntimeMethodHandle method, IntPtr parent, UInt32 invocationFlags) at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Diagnostics.TraceUtils.GetRuntimeObject(String className, Type baseType, String initializeData) at System.Diagnostics.TypedElement.BaseGetRuntimeObject() at System.Diagnostics.ListenerElement.GetRuntimeObject() at System.Diagnostics.ListenerElementsCollection.GetRuntimeObject() at System.Diagnostics.TraceInternal.get_Listeners() at System.Diagnostics.TraceInternal.WriteLine(Object value) at System.Diagnostics.Debug.WriteLine(Object value) at BaaNOA.PrintOA(String trid)

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• hg access control

  - by andreas buykx

  Me and a couple of colleagues are starting to use mercurial, and we want to have a shared repository that would contain our QC-ed changes. Each of the developers hg clones the repository and pushes his changes back to the shared repository. I've read the HG init tutorial and skimmed through the red bean book, but could not find how to control who is allowed to push changes to the shared repository. Can someone tell me how to set up a hg repository such that it only allows specified users (by unix userids) to push changes?

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• can you use proxies to do load/stress testing on a server, with proxy serving as a sort of mirror?

  - by EndangeringSpecies

  suppose I want to test a server's and its web application's ability to handle many simultaneous connections well and show decent latency. So ideally I would want a thousand machines to bombard it with usage requests, but that's not practicable. So instead, can I just make a testing script with a thousand threads to run on the same server and have them perform the testing, connecting to the server via a geographically far-away proxy? My reasoning here is that the signal will have to travel realistically big distances to the proxy and back, so that sort of emulates the reality of real clients accessing the server. Then again, to take this one step further, are there prepackaged emulators/frameworks that could perform a similar test without using internet at all, just simulating the latency of the network, realistically creating all the socket connections and other resource intensive stuff etc?

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• How do I force git to use LF instead of CR+LF under windows?

  - by Sorin Sbarnea

  I want to force git to checkout files under Windows using just LF not CR+LF. I checked the two configuration options but I was not able to find the right combination of settings. I want it to convert all files to LF and keep the LF on the files. Remark: I used autocrlf = input but this just repairs the files when you commit them. I want to force it to get them using LF. Probably I wasn't so clear: the repository is already using LF but the files checked out using msysgit are using CR+LF and I want to forge msysgit to get them with LF: forcing Unix line endings.

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• How do I shorten the repository URL using svn+ssh similar to svnserve -r?

  - by Marcus

  In the svnbook, it shows you how to shorten the URL to your repositories when using svnserve as a daemon, using -r like: svnserve -d -r /usr/local/repositories That way, you can refer to the repository you need right after the hostname in the URL without revealing any of the local path (which is /usr/local/repositories/project1): svn checkout svn://host.example.com/project1 However, now that I am switching to svn+ssh, I have the local path back in my repository URL: svn checkout svn+ssh://host.example.com/usr/local/repositories/project1 Does anyone know how to hide that local path and use a shorter URL as up above, using svn+ssh and WITHOUT using a UNIX soft link on the svn server? (you still end up with an extra string in the URL if you use a soft link...) UPDATE: The solution to this can be found in the accepted answer over on ServerFault (the green-checked answer). Yay!

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• Chrome SSL Security Issue under Windows systems?

  - by fraido

  The Fortify.net website allows you to check what SSL Encryption key is used by your browser. I gave it a try with the browsers I've on my machine and these are the results Fedora 9 Firefox 3.0.8 = AES cipher, 256-bit key Chrome 4.0.249.30 = AES cipher, 256-bit key Windows XP SP3 IE 6.0.2x = RC4 cipher, 128-bit key Firefox = AES cipher, 256-bit key Chrome 4.1.249.1042 (42199) = RC4 cipher, 128-bit key .... WHAT!!?!! Chrome is using RC4 128-bit (as IE6 does) that is well known as been very weak! Chrome under Unix works fine... I'm wondering how is this possible? Do you have this issue or is there a way to change the default key to be AES 256bit? I'm using Chrome as the main browser under Windows and I'm really considering to switch back to Firefox

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• Integrating WebSockets with Rails using Rack and Event Machine

  - by Toby Hede

  I have created an Asynchronous version of Rails 3 that I would like to integrate with a WebSocket implementation. I am using EventMachine, Ruby 1.9, Fibers and various em-flavoured libraries as documented by the wickedly good Ilya Grigorik. I have been looking at em-websocket as the handler for WebSocket connections but unsure of the best approach for hooking this into a Rails app. Ideally, this would work in a similar fashion to node.js with Express and Socket.io - incoming connections should be detected and dispatched to the WebSocket handler or the regular rails stack as indicated by the HTTP headers & etc. TL;DR WebSocket handler that plugs into an existing Rails application Transparently dispatch incoming WebSocket requests to endpoints in the app

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• How to load an RSA key from binary data to an RSA structure using the OpenSSL C Library?

  - by Andreas Bonini

  Currently I have my private key saved in a file, private.key, and I use the following function to load it: RSA *r = PEM_read_RSAPrivateKey("private.key", NULL, NULL, NULL); This works perfectly but I'm not happy with the file-based format; I want to save my key in pure binary form (ie, no base64 or similar) in a char* variable and load/save the key from/to it. This way I have much more freedom: I'll be able to store the key directly into the application const char key[] { 0x01, 0x02, ... };, send it over a network socket, etc. Unfortunately though I haven't found a way to do that. The only way to save and load a key I know of reads/saves it to a file directly.

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• Any good way to set the exit status of a Cocoa application?

  - by buglesareking

  I have a Cocoa app which interacts with a server and displays a GUI. If there is a fatal error, I display an alert and exit. I'd like to set the exit status to a non-zero value to reflect that an error occurred, for ease of interaction with some other UNIX based tools. Unfortunately I've been unable to find a good way to do so - NSApplication doesn't seem to have any way to set an exit status. At the moment, I've subclassed NSApplication and added an exitStatus ivar (which I set in my app delegate when necessary), then overridden -terminate: so that it calls exit(exitStatus). This works fine, but it seems a bit grungy to me, not to mention that I may be missing something important that the stadnard `terminate: is doing behind the scenes. I can't call [super terminate:sender] in my subclassed method, because that exit()s without giving me a chance to set the status. Am I missing something obvious?

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