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from __future__ import print_function
from code import InteractiveConsole
import errno
import socket
import sys
import eventlet
from eventlet import hubs
from eventlet.support import greenlets, get_errno
try:
sys.ps1
except AttributeError:
sys.ps1 = '>>> '
try:
sys.ps2
except AttributeError:
sys.ps2 = '... '
class FileProxy(object):
def __init__(self, f):
self.f = f
def isatty(self):
return True
def flush(self):
pass
def write(self, data, *a, **kw):
self.f.write(data, *a, **kw)
self.f.flush()
def readline(self, *a):
return self.f.readline(*a).replace('\r\n', '\n')
def __getattr__(self, attr):
return getattr(self.f, attr)
# @@tavis: the `locals` args below mask the built-in function. Should
# be renamed.
class SocketConsole(greenlets.greenlet):
def __init__(self, desc, hostport, locals):
self.hostport = hostport
self.locals = locals
# mangle the socket
self.desc = FileProxy(desc)
greenlets.greenlet.__init__(self)
def run(self):
try:
console = InteractiveConsole(self.locals)
console.interact()
finally:
self.switch_out()
self.finalize()
def switch(self, *args, **kw):
self.saved = sys.stdin, sys.stderr, sys.stdout
sys.stdin = sys.stdout = sys.stderr = self.desc
greenlets.greenlet.switch(self, *args, **kw)
def switch_out(self):
sys.stdin, sys.stderr, sys.stdout = self.saved
def finalize(self):
# restore the state of the socket
self.desc = None
print("backdoor closed to %s:%s" % self.hostport)
def backdoor_server(sock, locals=None):
""" Blocking function that runs a backdoor server on the socket *sock*,
accepting connections and running backdoor consoles for each client that
connects.
The *locals* argument is a dictionary that will be included in the locals()
of the interpreters. It can be convenient to stick important application
variables in here.
"""
print("backdoor server listening on %s:%s" % sock.getsockname())
try:
try:
while True:
socketpair = sock.accept()
backdoor(socketpair, locals)
except socket.error as e:
# Broken pipe means it was shutdown
if get_errno(e) != errno.EPIPE:
raise
finally:
sock.close()
def backdoor(conn_info, locals=None):
"""Sets up an interactive console on a socket with a single connected
client. This does not block the caller, as it spawns a new greenlet to
handle the console. This is meant to be called from within an accept loop
(such as backdoor_server).
"""
conn, addr = conn_info
host, port = addr
print("backdoor to %s:%s" % (host, port))
fl = conn.makefile("rw")
console = SocketConsole(fl, (host, port), locals)
hub = hubs.get_hub()
hub.schedule_call_global(0, console.switch)
if __name__ == '__main__':
backdoor_server(eventlet.listen(('127.0.0.1', 9000)), {})
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