As stated in the title. I'm trying to enable FTP over TLS and have inherited the TLS_FTPHandler class when writing my own custom Handler. However, this led to some hard-to-ignore but hard-to-identify causes of problems in the connection, leading to extremely high CPU usage and making the log file several gigabytes long (I turned on debug logging). **Recurrence:** Using client: FileZilla Pro ``` FileZilla Pro ------------- Version: 3.61.1 Build information: Compiled for: x86_64-w64-mingw32 Compiled on: x86_64-pc-linux-gnu Build date: 2022-09-30 Compiled with: x86_64-w64-mingw32-gcc (GCC) 10-win32 20210110 Compiler flags: -O2 -g -Wall -Wextra -Wno-deprecated-copy -ffunction-sections -fdata-sections -Wno-cast-function-type Linked against: wxWidgets: 3.0.6 SQLite: 3.35.5 GnuTLS: 3.7.7 Operating system: Name: Windows Server 2016 (build 20348), 64-bit edition Version: 10.0 Platform: 64-bit system CPU features: sse sse2 sse3 ssse3 sse4.1 sse4.2 avx avx2 aes pclmulqdq rdrnd bmi bmi2 adx lm Settings dir: [REDACTED] ``` 1. Initialize the server. I am in the process of integrating the FTP service into a system and the document that oversees the FTP service is here: [https://github.com/Creeper19472/cfms_2/blob/3646c8fd6de376489d7bc7e93946bc302ec064ca/include/fileftp/pyftpd.py](url) To start from the file itself, you should probably pass `main()` the absolute path to its project folder (I'm assuming you've cloned the repository, since this file needs to be backed by the database initialized by cfms_server.py in the root directory). And don't forget to install requirements `(pip install -i requirements.txt)` Run `cfms_server.py` (in the root directory), and it will initialize itself. Meanwhile it will start the ftp service on port 5104 (by default). 2. Create a database entry in content/fqueue.db. (It's a sqlite3 file) Like this: ``` INSERT INTO "main"."ft_queue" ("task_id", "token", "operation", "file_id", "fake_id", "fake_dir", "expire_time", "done") VALUES ('e6222cd64d3da6e99f9da8bd2c125101945ed15fa4218d3956ac254a97e1a7b9519fec189e41f6c6367fd61fb11bd217a37cfb0135b745cd21992812cfa19517', '["ca17b203c685b1300dd0317a1b0ad60b48eb5465dcc67efafcb6d3eee103f481", "53e12e72baccda5c0e37fed1b7180bbd"]', 'read', '0', 'acdc5311fac9aa2def188b2cd7c9f361523aa6c018ce6ed28034f16f607c71594d7f0cecf27ef069affbc69c2548d00d1a238761c3b805839b0c97d6f10f9d77', 'e6222cd64d3da6e99f9da8bd2c125101945ed15fa4218d3956ac254a97e1a7b9519fec189e41f6c6367fd61fb11bd217a37cfb0135b745cd21992812cfa19517', '1688993648.48515', '0'); ``` 3. Open FileZilla and connect to the server (deafult address is localhost:5104), username: `e6222cd64d3da6e99f9da8bd2c125101945ed15fa4218d3956ac254a97e1a7b9519fec189e41f6c6367fd61fb11bd217a37cfb0135b745cd21992812cfa19517`, password: `c54cc034130651c23416cd20f522fae855cc8fa869783b1798c0ad1d0d00d484` (per above) 4. download a file. then close the connection from FileZilla. 5. And see the log file. Like this below: ``` ... 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () 2023-07-09 19:53:11,499 - pyftpdlib - DEBUG - [debug] call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) () ... ``` I tried to find out what's going on, but I still have no idea after searching the Internet. The only thing I found is that this log seemed to be made by `handlers.py` (pyftpdlib), in line 3402: ``` except SSL.SysCallError as err: debug("call: _do_ssl_shutdown() -> shutdown(), err: %r" % err, inst=self) errnum, errstr = err.args if errnum in _ERRNOS_DISCONNECTED or \ errstr == 'Unexpected EOF': super().close() else: raise except SSL.Error as err: debug("call: _do_ssl_shutdown() -> shutdown(), err: %r" % err, inst=self) # see: # https://github.com/giampaolo/pyftpdlib/issues/171 # https://bugs.launchpad.net/pyopenssl/+bug/785985 if err.args and not getattr(err, "errno", None): pass else: raise except socket.error as err: debug("call: _do_ssl_shutdown() -> shutdown(), err: %r" % err, inst=self) if err.errno in _ERRNOS_DISCONNECTED: super().close() else: raise ``` But I actually don't know which statement caught the exception.

call: _do_ssl_shutdown() -> shutdown(), err: Error([('SSL routines', '', 'shutdown while in init')]) #603

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