Solutions to NULLIFY's 2019 CTF Script Challenges

sockping.py

import socket
import time
import sys

HOST = '18.216.82.207'
PORT = 2003

s = socket.create_connection((HOST,PORT))


def main():
	intro = s.recv(1024)
	print('Intro\t', repr(intro))
	time.sleep(3)
	call = s.recv(1024)
	print('Call\t\t', repr(call))
	'''
	print('Replaced\t\t', repr(call.replace(b'\n', b'')))
	response = call.lstrip() # replace(b'\n', b'') + b'\n'
	s.sendall(response)
	print('Response bytes:\t', repr(response))
	time.sleep(2)
	call = s.recv(1024)
	print('Call\t\t', repr(call))
	'''
def loop():

	HOST = '18.216.82.207'
	PORT = 2001

	s = socket.create_connection((HOST,PORT))


	intro = s.recv(1024)
	print('Intro\t', repr(intro))
	call = s.recv(1024)

	while call:
		print('Call\t\t', repr(call))
		response = call.lstrip()
		s.sendall(response)
		print("Sent\t", repr(response))
		time.sleep(1)
		call = s.recv(1024)

def rps():

	import re

	HOST = '18.216.82.207'
	PORT = 2002

	s = socket.create_connection((HOST,PORT))
	intro = s.recv(1024)

	print('Intro\t', repr(intro))
	time.sleep(3)
	call = s.recv(1024)

	while call:
		print('Call\t', repr(call))
		if re.search("\nROCK\n" , call.decode()):
			s.send(b'p\n')
			print('Sent: \t Paper')
		elif re.search("\nPAPER\n", call.decode()):
			s.send(b's\n')
			print('Sent: \t Scissors')
		else: 
			#re.search("\nSCISSORS\n", call.decode()):
			s.send(b'r\n')
			print('Sent: \t Rock')

		time.sleep(1.5)
		call = s.recv(1024)

def guessing():

	HOST = '18.216.82.207'
	PORT = 2003

	s = socket.create_connection((HOST,PORT))

	number = [4,2,9,4,9,6,7,2,9,5]
	guess = [0,0,0,0,0,0,0,0,0,0]

	res = s.recv(1024)
	
	print('Intro\t', repr(res))

	# to string => string = ''.join(str(n) for n in number)
	# to bytes => bytes = bytes(string.encode())

	i = 0

	while res:

		message = (''.join(str(g) for g in guess) + '\n')
		s.send(bytes(message.encode()))
		print("Sent:\t" + message)
		time.sleep(1)
		res = s.recv(1024)
		print('Result:\t', repr(res))

		if 'HIGH\n' not in  str(res.decode()):
			guess[i] +=1
			time.sleep(0.5)

		else: 
			guess[i] -= 1
			i += 1
			time.sleep(0.5)

def sorting():

	import re

	HOST = '18.216.82.207'
	PORT = 2004

	s = socket.create_connection((HOST,PORT))

	intro = s.recv(1024) 
	print("Intro:\t", repr(intro))

	res = s.recv(1024)
	print("Example:\t", repr(res))

	sort_me = res.decode().split('\n')[3].replace(' ', '').split(',')
	
	sort = list()

	for e in sort_me:
		sort.append(int(e))

	to_string = ', '.join(str(s) for s in sorted(sort))
	
	print('Sorted:\n' + to_string + '\n')

	s.send(bytes(to_string.encode() + b'\n'))
	res = s.recv(1024)

	print('Sort me:\t', repr(res))

	while res:

		sort_me = res.decode().replace(' ', '').split(',') # .split('\n').replace(' ', '').split(',')
		print(sort_me)
		
		sort = list()

		for e in sort_me:
			sort.append(int(e))
		
		to_string = ', '.join(str(s) for s in sorted(sort))

		print('Sorted:\n' + to_string + '\n')

		s.send(bytes(to_string.encode() + b'\n'))
		time.sleep(1)
		res = s.recv(1024)

		print('Sort me:\t', repr(res))

if __name__ == '__main__':
	guessing()