python > 3.5: Issue with unix domain sockets
Maximilian.Blenk@bmw.de
Maximilian.Blenk@bmw.de
Mon May 3 12:57:26 GMT 2021
Hello everyone,
I noticed that latest Cygwin release (3.2.0-1) has an issue with python and unix domain sockets, although I’m not a 100% sure about the root cause. My best guess is that something is wrong with the unix domain dockets implementation. I would like to attach the cygcheck.out but it seems to exceed the 180kb limit mentioned on the website (even zipped)
Simple Reproducer:
I tried to get the example shown at https://pymotw.com/3/socket/uds.html working. It works if I execute it with python3.5 (both client and server), but it doesn’t if I use python3.6 or newer (actually tested 3.6 and 3.7 on Windows 10):
Correct Behavior:
Server:
$ python3.5 server.py
starting up on ./uds_socket
waiting for a connection
connection from
received b'This is the mess'
sending data back to the client
received b'age. It will be'
sending data back to the client
received b' repeated.'
sending data back to the client
received b''
no data from
waiting for a connection
…
Client:
$ python3.5 client.py
connecting to ./uds_socket
sending b'This is the message. It will be repeated.'
received b'This is the mess'
received b'age. It will be'
received b' repeated.'
closing socket
Incorrect Behavior:
Server:
$ python3.7 server.py
starting up on ./uds_socket
waiting for a connection
Traceback (most recent call last):
File "server.py", line 27, in <module>
connection, client_address = sock.accept()
File "/usr/lib/python3.7/socket.py", line 214, in accept
sock = socket(self.family, self.type, self.proto, fileno=fd)
File "/usr/lib/python3.7/socket.py", line 151, in __init__
_socket.socket.__init__(self, family, type, proto, fileno)
SystemError: <slot wrapper '__init__' of '_socket.socket' objects> returned NULL without setting an error
Client:
$ python3.7 client.py
connecting to ./uds_socket
sending b'This is the message. It will be repeated.'
closing socket
Traceback (most recent call last):
File "client.py", line 27, in <module>
data = sock.recv(16)
ConnectionResetError: [Errno 104] Connection reset by peer
Am I missing something?
BR Max
--
BMW Car IT GmbH
Maximilian Blenk
Security Engineer
Lise-Meitner-Str. 14
89081 Ulm
Web: http://www.bmw-carit.de
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