connection.py

import struct
import time
import random
import hashlib
import socket
import os

version = struct.pack("i", 70002)
services = struct.pack("Q", 0)
timestamp = struct.pack("q", time.time())

addr_recv_services = struct.pack("Q", 0) #services
addr_recv_ip = struct.pack(">16s", "127.0.0.1")
addr_recv_port = struct.pack(">H", 8333)

addr_trans_services = struct.pack("Q", 0) #services
addr_trans_ip = struct.pack(">16s", "127.0.0.1")
addr_trans_port = struct.pack(">H", 8333)

nonce = struct.pack("Q", random.getrandbits(64))
user_agent_bytes = struct.pack("B", 0)
starting_height = struct.pack("i", 395292)
relay = struct.pack("?", False)

payload = version + services + timestamp + addr_recv_services + addr_recv_ip + addr_recv_port + addr_trans_services + addr_trans_ip + addr_trans_port + nonce + user_agent_bytes + starting_height + relay

magic = "F9BEB4D9".decode("hex")
command = "version" + 5 * "\00"
length = struct.pack("I", len(payload))

check = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4]

msg = magic + command + length + check + payload

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

HOST = "66.90.137.89"
PORT = 8333

s.connect((HOST, PORT))

s.send(msg)

s.recv(1024)