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Re: how to modify a PE file add my dll in import table 24-Apr-02 22:16 24-Apr-02 22:16  i need source code thx! string search utility tppradeep1822-Apr-02 21:54 tppradeep18 22-Apr-02 21:54  Can somebody please give me URL to any utility for searching a string withing another string. I know VC++ is very powerful. I want to use the utlity in Visual Basic. It would be nice if there is utility in DLL form which I can use in Visual Basic. Does someone know. Please help me. Re: string search utility Joaquín M López Muñoz23-Apr-02 3:19 Joaquín M López Muñoz 23-Apr-02 3:19  Can't you use built-in function InStr for this purpose? My guess is that its performance will match that of any regular implementation in C++. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo Closing application in InitDialog() Sameer Maggon22-Apr-02 21:52 Sameer Maggon 22-Apr-02 21:52  Hi, How do i close my application in InitDialog() According to some checkings i want to terminate my application.. I've tried EndDialog.. and DestroyWindow() Please help Re: Closing application in InitDialog() Hans Ruck22-Apr-02 22:00 Hans Ruck 22-Apr-02 22:00  As i understand, your application is a dialog-based one? rechi Re: Closing application in InitDialog() Sameer Maggon22-Apr-02 22:06 Sameer Maggon 22-Apr-02 22:06  Yes, my application is a Dialog Based MFC Application Re: Closing application in InitDialog() Hans Ruck22-Apr-02 22:09 Hans Ruck 22-Apr-02 22:09  Then, it should work with EndDialog. I've created a test application and i've put: EndDialog(0); // adding this!!! return TRUE; // return TRUE unless you set the focus to a control The application is stopping immediately. rechi Re: Closing application in InitDialog() AlexMarbus23-Apr-02 0:35 AlexMarbus 23-Apr-02 0:35  You can call EndDialog, but don't use '0' as argument: use IDOK or IDCANCEL instead. -- Alex Marbus www.marbus.net But then again, I could be wrong. Re: Closing application in InitDialog() Hans Ruck23-Apr-02 0:48 Hans Ruck 23-Apr-02 0:48  OK, OK... 0 was just a random value to see if EndDialog works fine. rechi Re: Closing application in InitDialog() Tim Smith23-Apr-02 2:19 Tim Smith 23-Apr-02 2:19  You can use 0. You can use 13259. The argument to EndDialog is just the value that is returned to the application. IDOK and IDCANCEL are used so application can tell which control closed the dialog. Tim Smith I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk? Backdoors! Rickard Andersson2022-Apr-02 21:29 Rickard Andersson20 22-Apr-02 21:29  I will sonn start a big Client/Server project and I have a question about backdoors (if you know what I mean?). How to prevent them? It's a difficult question but is there any documentation on the net which the most common backdoors is? I want to write a safety server with no leaks! ------------------------------------ Rickard Andersson, Suza Computing ICQ#: 50302279 I'm from the winter country SWEDEN! ------------------------------------ Re: Backdoors! l a u r e n22-Apr-02 22:34 l a u r e n 22-Apr-02 22:34  ummmm it totally depends on what server platform you use if you use iis there are known holes and fixes and whatnots linux / unix the same if you were to write your own say web server you could make it hack proof to a large extent a) because you know exactly what does what and b) cos the hackers dont know the system its kinda a vague answer to a vague question situations to avoid #37: "good morning ... how many sugars do you take in your coffee ... and what was your name again?" coming soon: situations to avoid #38: "...and the dog was there too?" Re: Backdoors! Rickard Andersson2022-Apr-02 23:07 Rickard Andersson20 22-Apr-02 23:07  lauren wrote: its kinda a vague answer to a vague question Well, I predicted it wouldn't be easy to answer. I building a TCP/IP server in Win32 API and it's gonna be a server that handle unlimited connections and it's a chat server. Is there any leaks that can take a hacker into the system if I run the server on: 1) WinXP 2) Linux 3) Win9x 4) Win2000 I know as I said before that this isn't an easy question to answer, but I just want to know if there is any specific leaks or something that I might know! ------------------------------------ Rickard Andersson, Suza Computing ICQ#: 50302279 I'm from the winter country SWEDEN! ------------------------------------ Re: Backdoors! Giles23-Apr-02 0:12 Giles 23-Apr-02 0:12  Buffer under/over runs, though people accidently , or even maliciously passing strings/streams of data, that can cause your custom protocol to fail. This is largely seen in C++ imlpementation though the use of pointers or unchecked arrays, that can go below or above the array boundaries. Not only could data become corupted like this, clever malicous programmers can exploit these weakneses, and inject there own binary code that executes correctly and allows then to execute thier own code on the server, quite often as a worm or virus - e.g. Nimida, or what ever it is called. Where as with a langage like VB this kind of thing is less likley to happen. With VB for example there are still weaknesses that can be exploted with poorly implemented code. But then you don't often write severs in VB that handle multimepl connections. The clasic example is for a web server. A user passes a URL of a page to be served e.g. http:\\localhost\index.htm A bad implementation would just chop off the http and host name and convert it to the currect webroot folder, so that a malformed address such as http:\\localhost\..\..\a_file.txt would be transalated to extract a file two folders above the webroot folder though the .. in the path!! Think about ways in which someone implementing a custom client for your server could accidently malform the protocol or data passed, and how the server would handle it. e.g. The first 4 bytes of your custom protocol indicate how many bytes are in the buffer, when in fact more have been passed. Validate everything. Hope this helps, Giles Re: Backdoors! Rickard Andersson2023-Apr-02 0:55 Rickard Andersson20 23-Apr-02 0:55  If I always check what data my server recevies and check if it's a valid command and then do something. If a string that is unrecognized will be sent to the server it just ignoring that string and keep call recv().... shouldn't it be pretty impossible for Nimba viruses to execute their self?? I mean, I check what kind of string that my server receves and so... if my custom protocoll on my server has commands like: MSG Hello developers out there! MSGEND\t\t FIL file_data_goes_here FileName.exe you see that each command have 3 letters. And if I check the string that receves if the 3 first letters is MSG or FIL then I keep going and handle the commands, but if the 3 first letters is unrecognized by the server it just ignore the receved string and keep listening...and if it repeates too many times you could close the connection to to the client... Isn't that good enough, Giles? ------------------------------------ Rickard Andersson, Suza Computing ICQ#: 50302279 I'm from the winter country SWEDEN! ------------------------------------ Re: Backdoors! Mike Nordell23-Apr-02 10:12 Mike Nordell 23-Apr-02 10:12  I building a TCP/IP server in Win32 API and it's gonna be a server that handle unlimited connections and it's a chat server. Perhaps you should have a look at the existing IRC servers? From what you wrote it seems you're trying to reinvent the wheel. How to check if a directory Exists Sameer Maggon22-Apr-02 21:10 Sameer Maggon 22-Apr-02 21:10  Hi, How can i check whether a directory exists or not.. suppose i want to check for a directory "C:\ABC\DATA" "C:\ABC\MAM" Re: How to check if a directory Exists l a u r e n22-Apr-02 21:16 l a u r e n 22-Apr-02 21:16  use the findfirstfile() thingy and set the win32_find_data dwAttributes member to have the FILE_ATTRIBUTE_DIRECTORY included situations to avoid #37: "good morning ... how many sugars do you take in your coffee ... and what was your name again?" coming soon: situations to avoid #38: "...and the dog was there too?" Re: How to check if a directory Exists Sameer Maggon22-Apr-02 21:55 Sameer Maggon 22-Apr-02 21:55  Thanx for the help Re: How to check if a directory Exists Tom Archer23-Apr-02 3:50 Tom Archer 23-Apr-02 3:50  You can also use the _access C runtime function. Cheers, Tom Archer Author, Inside C# Please note that the opinions expressed in this correspondence do not necessarily reflect the views of the author. Re: How to check if a directory Exists Mike Nordell23-Apr-02 10:15 Mike Nordell 23-Apr-02 10:15  You can also use the _access C runtime function. But please don't do it. Either use ANSI C functions, ISO C++ functions or native functions. Mixing in POSIX (which is a half-breed in Win32 land - fits like a foot in a glove) makes no sense. Re: How to check if a directory Exists Tom Archer23-Apr-02 10:23 Tom Archer 23-Apr-02 10:23  You're going to have to do a lot better than that. Exactly why does it make "no sense"? Cheers, Tom Archer Author, Inside C# Please note that the opinions expressed in this correspondence do not necessarily reflect the views of the author. Re: How to check if a directory Exists Ravi Bhavnani23-Apr-02 10:33 Ravi Bhavnani 23-Apr-02 10:33  CString strDirectory = "..."; CFileStatus fileStatus; if (CFile::GetStatus (strDirectory, fileStatus)) { if (fileStatus.m_attribute & CFile::directory) { // dir exists ... } } /ravi "There is always one more bug..." http://www.ravib.com ravib@ravib.com Re: How to check if a directory Exists Jamie Hale16-May-02 10:05 Jamie Hale 16-May-02 10:05  This was quite handy! Thanks. J "I am wise enough to therefore not spout my ill informed opinion as if it were remotely related to fact." - Christian Graus Re: How to check if a directory Exists Ravi Bhavnani16-May-02 10:56 Ravi Bhavnani 16-May-02 10:56  Glad to help, Jamie. Actually I'm working on a CP article that will collect all file/dir handling methods into a single class. Stay tuned! /ravi "There is always one more bug..." http://www.ravib.com ravib@ravib.com

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