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app.py
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app.py
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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
import socket
import threading
import time
import logging
import os
import errno
_logger = logging.getLogger()
_logger.setLevel(os.getenv("LOG_LEVEL", logging.WARNING))
def server(local_port, remote_cid, remote_port):
try:
dock_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
dock_socket.bind(("", local_port))
dock_socket.listen(128)
while True:
client_socket = dock_socket.accept()[0]
server_socket = socket.socket(socket.AF_VSOCK, socket.SOCK_STREAM)
server_socket.connect((remote_cid, remote_port))
outgoing_thread = threading.Thread(
target=forward, args=(client_socket, server_socket)
)
incoming_thread = threading.Thread(
target=forward, args=(server_socket, client_socket)
)
outgoing_thread.start()
incoming_thread.start()
except Exception as e:
_logger.debug(f"exception happened in proxy thread: {e}")
finally:
new_thread = threading.Thread(
target=server, args=(local_port, remote_cid, remote_port)
)
new_thread.start()
def forward(source, destination):
string = " "
while string:
string = source.recv(1024)
if string:
destination.sendall(string)
else:
try:
source.shutdown(socket.SHUT_RD)
destination.shutdown(socket.SHUT_WR)
except socket.error as e:
# race condition
if e.errno != errno.ENOTCONN:
raise
def run(local_port, enclave_cid, enclave_port):
thread = threading.Thread(
target=server, args=(local_port, enclave_cid, enclave_port)
)
thread.start()
while True:
time.sleep(60)
if __name__ == "__main__":
_logger.info("starting vsock proxy")
run(443, 16, 5000)