Debug your program in gdb$.$ The following questions may be of interest

$1.$ What are all the functions in the provided file? And how are they connected?

$2.$ What is the assembly code for each fiunction?

a$.$ What potentially does this function do$?$ Is it of interest? b

$.$ Are there any potential arrays$/$buffers$?$ Are there any local variables? Where are they in the stack$/$heap$?$ If there is an array$/$buffer$,$ what can potentially be its size?

Note: If there is a strepy $()$ function, the local buffer address is generally specified by the lea $($load effective address$)$ command a couple of lines above stropy$()$

c$.$ Is there any compor jmp$/$jle$/$jge in the code? What are they trying to do and where are they leading to$?$

d$.$ What is an estimate of the function's saved ebp and return address"

$3.$ Based on step $2.$ what is the potential format of the exploit string