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April 15, 2017 07:29
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TCP 劫持
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import asyncio | |
import socket | |
import struct | |
SO_ORIGINAL_DST = 80 | |
class NATCPServerProtocol(asyncio.Protocol): | |
def connection_made(self, transport): | |
self.src = peername = transport.get_extra_info('peername') | |
self.sock = sock = transport.get_extra_info('socket') | |
self.dst = self.get_dst_from_socket(sock) | |
print('Connection from {} to {}.'.format(peername, self.dst)) | |
self.transport = transport | |
self.buffer = b'' | |
self.closed = False | |
self.client = NATCPClientProtocol(self) | |
asyncio.ensure_future(self.setup_client()) | |
def data_received(self, data): | |
if not hasattr(self.client, 'transport'): | |
self.buffer += data | |
else: | |
self.client.transport.write(data) | |
def connection_lost(self, exc): | |
if hasattr(self.client, 'transport'): | |
self.client.transport.close() | |
self.closed = True | |
print('Client closed the connection from {} to {}.'.format(self.src, self.dst)) | |
def get_dst_from_socket(self, sock): | |
dst_info = sock.getsockopt(socket.SOL_IP, SO_ORIGINAL_DST, 16) | |
port, ip = self.port_and_ip_struct.unpack(dst_info) | |
ip = socket.inet_ntoa(ip) | |
return ip, port | |
async def setup_client(self): | |
loop = asyncio.get_event_loop() | |
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
sock.setsockopt(socket.SOL_IP, socket.IP_TRANSPARENT, 1) | |
sock.bind((self.src[0], 0)) | |
sock.setblocking(False) | |
await loop.sock_connect(sock, self.dst) | |
await loop.create_connection(lambda: self.client, sock=sock) | |
port_and_ip_struct = struct.Struct('!2xH4s8x') | |
class NATCPClientProtocol(asyncio.Protocol): | |
def __init__(self, server): | |
self.server = server | |
def connection_made(self, transport): | |
if self.server.closed: | |
transport.close() | |
else: | |
self.transport = transport | |
self.transport.write(self.server.buffer) | |
self.server.buffer = b'' | |
def data_received(self, data): | |
self.server.transport.write(data) | |
def connection_lost(self, exc): | |
print('Remote server closed the connection from {} to {}.'.format(self.server.src, self.server.dst)) | |
self.server.transport.close() | |
loop = asyncio.get_event_loop() | |
# Each client connection will create a new protocol instance | |
coro = loop.create_server(NATCPServerProtocol, '0.0.0.0', 2334) | |
server = loop.run_until_complete(coro) | |
# Serve requests until Ctrl+C is pressed | |
print('Serving on {}'.format(server.sockets[0].getsockname())) | |
try: | |
loop.run_forever() | |
except KeyboardInterrupt: | |
pass | |
# Close the server | |
server.close() | |
loop.run_until_complete(server.wait_closed()) | |
loop.close() |
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