Assembly TCP Echo Server

Requirements

Windows! This uses windows syscalls and win64 calling convention

nasm - Our assembler to turn *.asm files into binary

Windows SDK - We use windows api system calls so we need to link with the *.Lib files these function are found in

link - The windows link.exe application which will turn our binary into a valid Portable Executable (PE) file

Running

The make.ps1 builds and runs the echo server

1. Find the below in in the make.ps1 file and update to your windows SDK path

   $WIN_LIB_PATH = "C:\Program Files (x86)\Windows Kits\10\Lib\10.0.19041.0"

2. Run the below in a powershell window

   .\make.ps1

3. Thats it!

Did it work?

You should see the terminal hang if it is running. It is now listening on all IPv4 interfaces on port 6969 Can test with your favourite TCP client. Example using netcat

    echo "Testing my echo server" | nc -v 127.0.0.1 6969