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• help in security assignment

  - by scatman

  i have to write a program that sniffs network packets (part1-the simple part). and i have to update the program (part2) so that it will be able to terminate connections. the specific requirements are: construct raw packets by specifying data link layer and network layer information including appropriate source and destination MAC and IP addresses. These packets are intended to terminate the connection. To do so, you should used SOCK_RAW as the socket type to be able to set the header information by yourself. can anybody give me some ideas on the second part? should i hijack the session,apply a dos attack on one of the users?? all i need is some tips of how to terminate the connection. i am using c programming language. and this is a course assignment for the security course.

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• Keeping the scroll to bottom

  - by Shishant

  Hello, I have a shoutbox and I want to keep the scroll to bottom same as IM windows. My html is <div id="shoutContainer"> <table id="shoutbox"> <tbody> <!-- shouts here --> </tbody> </table> </div> My css #shoutContainer { height: 100px; overflow-y: scroll; } If its not possible through html and css. Can we achieve this in raw javascript? because I am not using any framework

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• File management

  - by user343934

  I am working on python and biopython right now. I have a file upload form and whatever file is uploaded suppose(abc.fasta) then i want to pass same name in execute (abc.fasta) function parameter and display function parameter (abc.aln). Right now i am changing file name manually, but i want to have it automatically. Workflow goes like this. ----If submit is not true then display only header and form part --- if submit is true then call execute() and get file name from form input --- Then display the save file result in the same page. File name is same as input. My raw code is here -- http://pastebin.com/FPUgZSSe Any suggestions, changes and algorithm is appreciated Thanks

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• Html POST and return the same form with the values

  - by vtortola

  Hi, I'm learning web development, and I don't know how do this simple thing. I've a html form with "text", "radio" and "checkbox" controls, that POST the values to the server and it saves them, for example in a file. I save the POST in raw format: key=value&key=value&key=value&key=value and I'd like that when the user open the form back, return the form with the saved values already in the controls. Is there any neat way to do this? Or should I parse the POST string and set the values one by one in the controls at the server level? I think, I could return the saved data in a hidden input control, and after with a javascript I could do a getElementById(key) and set the value to each input control... but do I need to put the post string in a special format? How would you do it? Thank you in advance.

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• Monitoring an audio line.

  - by Stefan Liebenberg

  I need to monitor my audio line-in in linux, and in the event that audio is played, the sound must be recorded and saved to a file. Similiar to how motion monitors the video feed. Is it possible to do this with bash? something along the lines of: #!/bin/bash # audio device device=/dev/audio-line-in # below this threshold audio will not be recorded. noise_threshold=10 # folder where recordings are stored storage_folder=~/recordings # run indefenitly, until Ctrl-C is pressed while true; do # noise_level() represents a function to determine # the noise level from device if noise_level( $device ) > $noise_threshold; then # stream from device to file, can be encoded to mp3 later. cat $device > $storage_folder/`date`.raw fi; done;

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• Can't ssh from CentOS 6.5 to SUSE LINUX 10.1

  - by Pavel Tankov

  We have a quite old installation of SUSE LINUX 10.1 (i586) in the office. The problem shortly: I can successfully ssh to it from machines in the same LAN (192.168.1.0) and not from others (that are in 10.23.0.0). The SuSE has SSH server openssh-4.2p1-18.12. I have ruled out the firewall and hosts.allow and hosts.deny files. When my ssh login attempt fails, here is what the logs say: on the client: $ ssh -vvv 192.168.1.5 OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 192.168.1.5 [192.168.1.5] port 22. debug1: Connection established. debug1: identity file /home/nbuild/.ssh/identity type -1 debug1: identity file /home/nbuild/.ssh/identity-cert type -1 debug1: identity file /home/nbuild/.ssh/id_rsa type -1 debug1: identity file /home/nbuild/.ssh/id_rsa-cert type -1 debug1: identity file /home/nbuild/.ssh/id_dsa type -1 debug1: identity file /home/nbuild/.ssh/id_dsa-cert type -1 on the server: Aug 21 16:34:25 serverhost sshd[20736]: debug3: fd 4 is not O_NONBLOCK Aug 21 16:34:25 serverhost sshd[20736]: debug1: Forked child 20739. Aug 21 16:34:25 serverhost sshd[20736]: debug3: send_rexec_state: entering fd = 7 config len 403 Aug 21 16:34:25 serverhost sshd[20736]: debug3: ssh_msg_send: type 0 Aug 21 16:34:25 serverhost sshd[20736]: debug3: send_rexec_state: done Aug 21 16:34:25 serverhost sshd[20739]: debug1: rexec start in 4 out 4 newsock 4 pipe 6 sock 7 Aug 21 16:34:25 serverhost sshd[20739]: debug1: inetd sockets after dupping: 3, 3 Aug 21 16:34:25 serverhost sshd[20739]: debug3: Normalising mapped IPv4 in IPv6 address Aug 21 16:34:25 serverhost sshd[20739]: Connection from 10.23.1.11 port 44340 The above log on the server is when I enable DEBUG3 log level. However, with the default log level (INFO), the only thing the server logs is this: Aug 21 16:38:32 serverhost sshd[20749]: Did not receive identification string from 10.23.1.11 Any hints? I feel I've tried everything already.

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• django - order query set by postgres function

  - by thebiglife

  My initial question was here and was related to the postgres backend. http://stackoverflow.com/questions/2408965/postgres-subquery-ordering-by-subquery Now my problem has moved onwards to the Django ORM layer. I essentially want to order a query by a postgres function ('idx', taken from the above stackoverflow work) I've gone through trying to use model.objects.extra(order_by ) or simply order_by but I believe both of these need the order_by parameter to be an attribute or a field known to Django. I'm trying to think how to solve this without having to revert to using an entirely raw SQL query through a model manager.

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• Interacting With Class Objects in Ruby

  - by michaelmichael

  How can I interact with objects I've created based on their given attributes in Ruby? To give some context, I'm parsing a text file that might have several hundred entries like the following: ASIN: B00137RNIQ -------------------------Status Info------------------------- Upload created: 2010-04-09 09:33:45 Upload state: Imported Upload state id: 3 I can parse the above with regular expressions and use the data to create new objects in a "Product" class: class Product attr_reader :asin, :creation_date, :upload_state, :upload_state_id def initialize(asin, creation_date, upload_state, upload_state_id) @asin = asin @creation_date = creation_date @upload_state = upload_state @upload_state_id = upload_state_id end end After parsing, the raw text from above will be stored in an object that look like this: [#<Product:0x00000101006ef8 @asin="B00137RNIQ", @creation_date="2010-04-09 09:33:45 ", @upload_state="Imported ", @upload_state_id="3">] How can I then interact with the newly created class objects? For example, how might I pull all the creation dates for objects with an upload_state_id of 3? I get the feeling I'm going to have to write class methods, but I'm a bit stuck on where to start.

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• overview/history of resident memory usage

  - by kapet

  I have a fairly complicated program (Python with SWIG'ed C++ code, long running server) that shows a constantly growing resident memory usage. I've been digging with the usual tools for the leak (valgrind, Pythons gc module, etc.) but to no avail so far. I'm a bit afraid that the actual problem is memory fragmentation within Python and/or libc managed memory. Anyway, my question is more specific right now: Is there a tool to visualize resident memory usage and ideally show how it develops over time? I think the raw data is in /proc/$PID/smaps but I was hoping there's some tool that shows me a nice graph of the amounts used by mmap'ed files vs. anonymous mmap'ed memory vs. heap over time so that it's easier to see (literally) what's changing. I couldn't find anything though. Does anybody know of a ready to use tool that graphs memory usage over space and time in an intuitive way?

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• SSRS Issue: Rounding to nearest .25

  - by D.R.

  I have an SSRS (2008) report that takes in a raw transactions, then groups and totals them. At the "Total" level, I would like to round the final numbers to the nearest .25, however I cannot find a method to do this. According to what I've read, the Round() function in SSRS only rounds to integers. I have found a couple ways to do it in SQL, but the problem is, I want to do all the calculations with the REAL numbers and just round the result so that I don't introduce a significant amount of error from the real numbers. Here's the best SQL solution I could find: dec(round(number * 4, 0)/4,11,2) as Nearest_Qtr Anyone know how I could do the equivalent in the actual SSRS report? Thanks in advance for the help!

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• Large file download for a Rails project

  - by Horace Ho

  One client project will be online two months later. One of the requirements changed is to support large files (10 to 15MB per RAW camera file, expected 1000 to 5000 files download per day) download worldwide for their customers. The process will be: there is upload screen via paperclip to the rails local public folder a hourly task to upload to web storage (S3?) update the download url from paperclip url to the web url Questions: is there a gem/plug-in for this purpose? if no, any gem/plug-in for S3 to recommend? Questions about the storage provider: is S3 recommended? or other service to recommend? The baseline is: the client's web server does not and will not have the bandwidth to handle the downloads. Thanks

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• how to add markup to text using JavaScript regex

  - by Richard

  I need to add markup to some text using JavaScript regular expressions. In Python I could do this with: >>> import re >>> re.sub('(banana|apple)', r'<b>{\1}</b>', 'I have 1 banana and 2 apples!') 'I have 1 <b>{banana}</b> and 2 <b>{apple}</b>s!' What is the equivalent in JavaScript? string.replace(regex, newstring) seems to only take a raw string for replacing.

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• Appropriate high level language to deal with binary data

  - by fortran

  Hi, I need to write a small tool that parses a textual input and generates some binary encoded data. I would prefer to stay away from C and the like, in favour of a higher level, (optionally) safer, more expressive and faster to develop language. My language of choice for this kind of tasks usually is Python, but for this case dealing with binary raw data can be problematic if one isn't very careful with the numbers being promoted to bignums, sign extensions and such. Ideally I would like to have records with named bitfields that are portable to be serialised in a consistent manner. (I know that there's a strong point in doing it in a language I already master, although it isn't optimal, but I think this could be a good opportunity to learn something new). Thanks.

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• Android: Playing sound when button clicked?

  - by gazeebo

  Hi all, I'm trying to play a sound file when a button is clicked but keeps getting an error. The error is "The method create(Context, int) in the type MediaPlayer is not applicable for the arguments (new View.OnClickListener(){}, int)" Here's my code: @Override public void onClick(View v) { // TODO Auto-generated method stub Button zero = (Button)this.findViewById(R.id.btnZero); zero.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub mp = MediaPlayer.create(this, R.raw.mamacita_zero); } }); } Any help or tips would be appreciated. Thnx!

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• rails migration. modify starting point for auto_increment

  - by railsnew

  I have a table already created. I am looking for a rails migration where I can modify the starting point of the auto_increment number for id column of my table. Let's say I want it to start from 1000. I googled a bit and came across this: it says: :options "string" pass raw options to your underlying database, e.g. auto_increment = 10000. Note that passing options will cause you to lose the default ENGINE=InnoDB statement Can this be used for something I want? and how will the migration look since i am changing the column and not creating new one...

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• Spring 3 - Theme with separate JSP

  - by Max

  Hi, I'm trying to rewrite some Spring 1.2 code to Spring 3.0 one. Currently I'm stuck with JSP resolved by URL problem. Application uses separate JSP files with different layouts for serving the same model from the same controller. The JSP is switched using interceptor, that intercepts the url and changes the view. For example: /design_one/mypage.htm -> MyPageController -> /design_one/mypage.jsp /design_two/mypage.htm -> MyPageController -> /design_two/mypage.jsp Is there a way to make same or similar functionality using something better than raw interceptors?

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• What is the typical maximum number of database connections for Oracle running on Windows server ?

  - by Sake

  We are maintaining a database server that serve a large number of clients. Each client typically running serveral client-applications. The total number of connections to the database server (Oracle 9i) is reaching 800 connections on peak load. The windows 2003 server is starting to run out of memory. We are now planning to move to 64bit Windows in order to gain higher memory capability. As a developer I suggest moving to multi-tier architecture with conneciton pooling, which I believe is a natural solution to this problem. However, in order to support my idea, I want the information on: what exactly is the typical number of connections allowed for Oracle database ? What is the problem when the number connections is too high ? Too much memory comsumption ? or too many sockets opened ? or too many context switching between threads ? To be a little bit specific, how could Oracle Forms application scale to thousand of users without facing this problem ? Shall Oracle RAC applied to this case ? I'm sure the answer to this question should depend on quite a number of factors, like the exact spec of the hardware being used. I'm expecting a rough estimation or some experience from the real world.

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• saving file name from html form input

  - by user343934

  I am working on python and biopython right now. I have a file upload form and whatever file is uploaded suppose(abc.fasta) then i want to pass same name in execute (abc.fasta) function parameter and display function parameter (abc.aln). Workflow goes like this. ----If submit is not true then display only header and form part --- if submit is true then call execute() and get file name from form input --- Then display the save file result in the same page. File name is same as input. My raw code is here -- http://pastebin.com/FPUgZSSe Any suggestions, changes and algorithm is appreciated Thanks

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• after building in more ram, bios/debian does nothing [closed]

  - by derty

  My private server has 2x1gb Ram working with a 64bit Debian and an Q6600 Intel. This runs 2 virtual mashines on it each one recives 512mb RAM. Which you can immagine is a bit tight for the hole system. Now i got 2x2gb ram from a friend. I'm not sure if thery are clocking at the same speed, but i'm sure my power adaptor is not on his limit and can handle that. So there are 2 ram sockets left at the mainboard. I shuted down the system and build in the 4 gigs and looked what happen. After pressing the start button, everything gets noisy as known BUT the screen shows nothing, not even the bios stuff it usally does. Why isn't the system booting? I can immagine that it does not direkt link between booting debian and the bios not showing a thing. Or is it Grub? I mounted the system disk, and i can see it, switch folders write stuff with "vim" it does not seems like there is a problem.

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• Deserialising Json to derived types in Asp.Net Web API

  - by IoChaos

  I'm calling a method of my WebAPI sending a json that I would like to match (or bind) with a model. In the controller I have a method like: public Result Post([ModelBinder(typeof(CustomModelBinder))]MyClass model); 'MyClass', wich is given as a parameter is an abstract class. I would like that at, depending of the type of json passed, the correct inherited class is instantiated. To achieve it, I'm trying to implement a custom binder. The problem is that (I don't know if it's very basic but I can't find anything) I don't know how to retrieve the raw Json (or better, some kind of serialization) that comes in the request. I see: actionContext.Request.Content But all methods are exposed as async. I don't know who this fits with passing the generate model to the controller method... Thanks a lot!

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• A simple group-by (no count) in Django

  - by Daniel Quinn

  If this were raw-SQL, it'd be a no-brainer, but in Django, this is proving to be quite difficult to find. What I want is this really: SELECT user_id FROM django_comments WHERE content_type_id = ? AND object_pk = ? GROUP BY user_id It's those last two lines that're the problem. I'd like to do this the "Django-way" but the only thing I've found is mention of aggregates and annotations, which I don't think solve this issue... do they? If someone could explain this to me, I'd really appreciate it.

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• Somewhat newb question about assy and the heap.

  - by Eric M

  Ultimately I am just trying to figure out how to dynamically allocate heap memory from within assembly. If I call Linux sbrk() from assembly code, can I use the address returned as I would use an address of a statically (ie in the .data section of my program listing) declared chunk of memory? I know Linux uses the hardware MMU if present, so I am not sure if what sbrk returns is a 'raw' pointer to real RAM, or is it a cooked pointer to RAM that may be modified by Linux's VM system? I read this: How are sbrk/brk implemented in Linux?. I suspect I can not use the return value from sbrk() without worry: the MMU fault on access-non-allocated-address must cause the VM to alter the real location in RAM being addressed. Thus assy, not linked against libc or what-have-you, would not know the address has changed. Does this make sense, or am I out to lunch?

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• How to make flyspell bypass some words by context?

  - by manu

  Hi, I use Emacs for writing most of my writings. I write using reStructuredText, and then transform them to LaTeX after some preprocessing since I write my citations á-la LaTeX. This is an excerpt of one of my texts (in Spanish): En \cite[pp.~XXVIII--XXIX]{Crnkovic2002} se brindan algunos riesgos que se pueden asumir con el desarrollo basado en componentes, los This text is processed by some custom scripts that deals with the \cite part so rst2latex can do its job. When I activate flyspell-mode it signals most of the citation keys as spelling errors. How can I tell flyspell not to spellcheck things within \cite commands. Furthermore, how can I combine rst-mode and flyspell, so that rst-mode would keep flyspell from spellchecking the following? reST comments reST code literal reST directive parameters and arguments reST raw directive contents Any ideas?

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• Single-Page Web Apps: Client-side datastores & server persistence

  - by fig-gnuton

  How should client-side datastores & persistence be handled in a single-page web application? Global vars vs. DI/IoC: Should datastores be assigned to global variables so any part of the application can access them? Or should they be dependency injected where required? Server persistence: Assuming a datastore's data needn't always be persisted to the server immediately, should the datastore itself handle persistence? If not, then what class should handle persistence and how should the persistence class fit into the client-side architecture overall? Is the datastore considered the model in MVC, or is it something else since it just stores raw data?

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• How to get the domain name from an url with PHP?

  - by ilhan

  For example http://www.google.com/ -> google.com http://www.ma219.metu.edu.tr -> metu.edu.tr https://www.nic.tr/ -> nic.tr http://www.plasticsurgery.a.bg/ -> plasticsurgery.a.bg www.abv.bg -> abv.bg abv.bg -> abv.bg The output should not have subdomain. Edit: It would be great if we were able to read http://mxr.mozilla.org/mozilla/source/netwerk/dns/src/effective_tld_names.dat?raw=1

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