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""" This is an incredibly simple port forwarder from port 7000 to 22 on
localhost. It calls a callback function when the socket is closed, to
demonstrate one way that you could start to do interesting things by
starting from a simple framework like this.
"""
import eventlet
def closed_callback():
print("called back")
def forward(source, dest, cb=lambda: None):
"""Forwards bytes unidirectionally from source to dest"""
while True:
d = source.recv(32384)
if d == '':
cb()
break
dest.sendall(d)
listener = eventlet.listen(('localhost', 7000))
while True:
client, addr = listener.accept()
server = eventlet.connect(('localhost', 22))
# two unidirectional forwarders make a bidirectional one
eventlet.spawn_n(forward, client, server, closed_callback)
eventlet.spawn_n(forward, server, client)
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