DOS | A simple dos attack api , written in go
kandi X-RAY | DOS Summary
kandi X-RAY | DOS Summary
This is a simple DOS attack api, built to help test server load.
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QUESTION
I'm trying to parse a DNS response using java. I'm following RFC-1035 for guidelines on how to send requests and receieve responses, the format that is.
According to said RFC the answer section of a response should look like so:
...ANSWER
Answered 2022-Apr-04 at 15:33My problem is that I can't seem to parse the NAME in the answer section. It seems to start with a pointer which makes no sense.
I probably know at lot less about this than you but am wondering why you say that? firstByte
is telling you there's a pointer and the following value (0x0c) shows you the offset of the name for compression purposes (if I've got that right). None of the other bits in the same byte as firstByte
is set so that can be ignored from the point of view of the offset value
QUESTION
I'm trying to get my head around programming real mode MS-DOS in C. Using some old books on game programming as a starting point. The source code in the book is written for Microsoft C, but I'm trying to get it to compile under OpenWatcom v2. I've run into a problem early on, when trying to access a pointer to the start of VGA video memory.
...ANSWER
Answered 2022-Apr-03 at 07:23It appears your OpenWatcom C compiler is defaulting to using C89. In C89 variable declarations must be at the beginning of a block scope. In your case all your code and data is at function scope, so the variable has to be declared at the beginning of main
before the code.
Moving the variable declaration this way should be C89 compatible:
QUESTION
IS it possible to look for an array of strings and/or integers inside an array of strings and/or integers? If so, then how?
To find a string in an array of strings I use code like:
...ANSWER
Answered 2022-Jan-27 at 19:29Personalized Study
- Change the number format of the cells containing the values to general or to a numeric format to make it work.
QUESTION
I got from a Linux-server an xml-file on a window10-machine. The file was base64-coded. I decoded the xml with a Perl-script using function decode_base64
from MIME::Base64
. I tested with a Perl-script if it is well-formed but this was not the case:
ANSWER
Answered 2022-Jan-07 at 15:42You don't have "hex codes" or "octal codes". That's how Notepad++ and Emacs display invalid bytes in the file.
The problem is that this doesn't match the file:
QUESTION
I cannot seem to sort out this challenge. I want the div #project1
to show (visibility, opacity, display) when hover on #img1
.
can't find the solution. would really appreciate some help.
...ANSWER
Answered 2022-Jan-31 at 03:08QUESTION
So i have to multiply 'a' by a number of 'b' times and I tried to do it like this. I also took some procedures from other questions I found.
...ANSWER
Answered 2022-Jan-16 at 01:51I keep getting the same error as 'Operand types do not match on lines 18 and 19
That's because TASM knows that the a and b variables are byte-sized given that they were defined using the DB
directive, but your instructions mov bx,a
and mov cx,b
are word-sized operations. So, a mis-match.
Your program is using the a and b 'variables' for user input via the DOS.BufferedInput function 0Ah. Read all about this function here.
What your definitions should look like is:
QUESTION
[Background Information]
So I installed the new Visual Studio 2022 and decided to try out .NET Core 6 for a simple script. Firstly, I created a new console app and was immediately confused. No main method, with no write up in the documentation to using CLI arguments (I need to pass two target path arguments). I found a overflow post regarding how to access arguments through the System.Environment class. So I moved on.
[Question]
In .NET Core 5 console apps I had no problem running compiled executables with arguments through the CLI. But when I published my code and ran it through the command line I got the following output (see output) with the strange line "program cannot run in DOS mode". Interestingly enough, it still reads one of ini files, but when I run through powershell it reads the other ini. This is very strange behavior to me. Should I just downgrade back to .NET Core 5 or try and understand what's happening? Is it the fact that I am reading INI's ? (unfortunately I have no choice as its a legacy project). Any help is appreciated.
[Code]
...ANSWER
Answered 2022-Jan-11 at 21:27Environment.GetCommandLineArgs()
always has process file name as the first element. You should start from index 1.
QUESTION
I have been given an assignment to make a 2 pass assembler for 8086
. I wish to keep things simple and only assemble small programs for now. I found that the .COM
format is very simple. However I cannot find the specifics of the file format.
Also I read that execution always begins at 100h
. So won't it be a problem if MS-DOS
(actually DOSBOX
in my case) has system programs already present there? And Do I need to provide some default stub code in the 0h
-100h
part?
I simply want to know how will I write a .COM
file that is runnable on DOSBOX
.
ANSWER
Answered 2021-Dec-23 at 05:25The .COM
format has no structure, it's a flat binary.
The program (the whole file) is loaded to address 100h
in some segment. Below that, you'll find the PSP for your program. The last usable word in the segment (usually at offset fffeh
) will be overwritten with 0000h
and the stack pointer pointed to it. This allows you to exit the program with a ret
instruction.
DOS's program-loader sets all of CS
, DS
, ES
, and SS
to the segment of your program. Then, the DOS kernel jumps to address 0100h
(i.e. the start of your program) to run it. (Technically, the program loader doesn't set cs
until it does a far jmp
or iret
to the cs:100h
; if it had set CS
earlier, any IP
value would be inside the new program's memory, not the DOS kernel.)
That's really all there is to it. Your program doesn't have to care about segmentation at all, as long as the flat 64K of the "tiny" memory model is sufficient for all your static code+data loaded from the file, stack at the top, and any memory in between as BSS or "heap". Any segment base works the same, so for example [bx]
and [bp]
address the same linear address even though bp
implies ss:
and bx
implies ds:
.
Note that because the DOS kernel picks a segment for your program, it won't collide with any already loaded programs or the DOS kernel. It'll just work as expected.
As for writing COM programs, I recommend using an assembler like NASM with output format “binary” (i.e. no output format). The general template is this:
QUESTION
I have recieved a exercice to learn about data types in haskell and I can't figure out how to solve this one.
They got me a data like : data CatLista a = Nil | Unit a| Conc (CatLista a) (CatLista a) deriving Eq
and I need to make the data types become: Nil -> [] , Unit x -> [x] , Conc -> same operator as (++)
So if you run Conc (Unit 9)(Conc (Unit 5) (Unit 3)) == Conc (Conc (Unit 9) (Unit 5))(Conc (Unit 3) Nil)
should give true and Conc (Unit 9)(Unit 3) == Conc (Unit 3) (Unit 9)
should give false.
I already tried instancing the show class like this:
...ANSWER
Answered 2021-Dec-08 at 20:49Two values are not equivalent if these produce the same String
when calling show
on these. The (==) :: Eq a => a -> a -> Bool
function is implemented by the Eq
typeclass. You thus need to implement the instance
of Eq
for your CatLista
yourself.
The default implementation for Eq
, if you use deriving Eq
is that two values are the same if they have the same data constructor, and the parameters are elementwise equivalent by calling (==)
on these.
You thus can implement the instance for Eq
yourself with:
QUESTION
I have a problem to display the properties of an object that is inside another object... I made a relationship in the backend with TypeORM using relations to bring the departments into the users, but I can't use them in the user request because the request is arriving as [[prototype]]
.
ANSWER
Answered 2021-Oct-10 at 01:46Unless your user->department
relation is set to be eager
, you'll need to load the lazy relation.
eg:
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