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tcptee.py is a tee for TCP. It acts as a simple TCP proxy and dumps all traffic onto stdout.
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# A tee for TCP, similar to `socal -v`. | |
# | |
# | server | |
# client ---| | |
# | stdout | |
import socket | |
from select import select | |
import sys | |
import logging | |
class TcpTee: | |
def __init__(self, source_port, destination): | |
self.destination = destination | |
self.teesock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
self.teesock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) | |
self.teesock.bind(('127.0.0.1', source_port)) | |
self.teesock.listen(200) | |
# Linked client/server sockets in both directions | |
self.channel = {} | |
def run(self): | |
while 1: | |
inputready, outputready, exceptready = select([self.teesock] + list(self.channel.keys()), [], []) | |
for s in inputready: | |
if s == self.teesock: | |
self.on_accept() | |
break | |
data = s.recv(4096) | |
if not data: | |
self.on_close(s) | |
break | |
self.on_recv(s, data) | |
def on_accept(self): | |
clientsock, clientaddr = self.teesock.accept() | |
serversock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
try: | |
serversock.connect(self.destination) | |
except Exception: | |
logging.exception('Could not connect to server %s. Closing connection to client %s' % (self.destination, clientaddr)) | |
clientsock.close() | |
else: | |
logging.info("%r has connected", clientaddr) | |
self.channel[clientsock] = serversock | |
self.channel[serversock] = clientsock | |
def on_close(self, sock): | |
logging.info("%s has disconnected", sock.getpeername()) | |
othersock = self.channel[sock] | |
sock.close() | |
othersock.close() | |
del self.channel[sock] | |
del self.channel[othersock] | |
def on_recv(self, sock, data): | |
print(data) | |
self.channel[sock].send(data) | |
if __name__ == '__main__': | |
import argparse | |
parser = argparse.ArgumentParser() | |
parser.add_argument("listen_port", help="The port this process will listen on.", type=int) | |
parser.add_argument("server_host", help="The remote host to connect to.") | |
parser.add_argument("server_port", help="The remote port to connect to.", type=int) | |
args = parser.parse_args() | |
logging.basicConfig(stream=sys.stderr, level=logging.DEBUG) | |
tee = TcpTee(int(args.listen_port), (args.server_host, int(args.server_port))) | |
try: | |
tee.run() | |
except KeyboardInterrupt: | |
logging.info("Ctrl C - Good Bye") | |
sys.exit(1) |
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