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Description:

pyftpdlib 2.0.0

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About
Python FTP server library provides a high-level portable interface to easily
write very efficient, scalable and asynchronous FTP servers with Python. It is
the most complete RFC-959 FTP server
implementation available for Python programming
language.

Features

Extremely lightweight, fast and scalable (see
why and
benchmarks).
Uses sendfile(2) (see pysendfile)
system call for uploads.
Uses epoll() / kqueue() / select() to handle concurrency asynchronously.
…But can optionally skip to a
multiple thread / process
model (as in: you’ll be free to block or use slow filesystems).
Portable: entirely written in pure Python.
Supports FTPS (RFC-4217),
IPv6 (RFC-2428),
Unicode file names (RFC-2640),
MLSD/MLST commands (RFC-3659).
Support for virtual users and virtual filesystem.
Flexible system of “authorizers” able to manage both “virtual” and
“real” users on on both
UNIX
and
Windows.

Performances
Despite being written in an interpreted language, pyftpdlib has transfer rates
comparable or superior to common UNIX FTP servers written in C. It usually tends
to scale better (see benchmarks)
because whereas vsftpd and proftpd use multiple processes to
achieve concurrency, pyftpdlib only uses one (see the C10K problem).

pyftpdlib vs. proftpd 1.3.4

benchmark type
pyftpdlib
proftpd
speedup

STOR (client -> server)
585.90 MB/sec
600.49 MB/sec
-0.02x

RETR (server -> client)
1652.72 MB/sec
1524.05 MB/sec
+0.08

300 concurrent clients (connect, login)
0.19 secs
9.98 secs
+51x

STOR (1 file with 300 idle clients)
585.59 MB/sec
518.55 MB/sec
+0.1x

RETR (1 file with 300 idle clients)
1497.58 MB/sec
1478.19 MB/sec
0x

300 concurrent clients (RETR 10M file)
3.41 secs
3.60 secs
+0.05x

300 concurrent clients (STOR 10M file)
8.60 secs
11.56 secs
+0.3x

300 concurrent clients (QUIT)
0.03 secs
0.39 secs
+12x

pyftpdlib vs. vsftpd 2.3.5

benchmark type
pyftpdlib
vsftpd
speedup

STOR (client -> server)
585.90 MB/sec
611.73 MB/sec
-0.04x

RETR (server -> client)
1652.72 MB/sec
1512.92 MB/sec
+0.09

300 concurrent clients (connect, login)
0.19 secs
20.39 secs
+106x

STOR (1 file with 300 idle clients)
585.59 MB/sec
610.23 MB/sec
-0.04x

RETR (1 file with 300 idle clients)
1497.58 MB/sec
1493.01 MB/sec
0x

300 concurrent clients (RETR 10M file)
3.41 secs
3.67 secs
+0.07x

300 concurrent clients (STOR 10M file)
8.60 secs
9.82 secs
+0.07x

300 concurrent clients (QUIT)
0.03 secs
0.01 secs
+0.14x

For more benchmarks see here.

Command line usage
Start a FTP server, with an anonymous user with write permissions, on port 2121:
$ python3 -m pyftpdlib --write
RuntimeWarning: write permissions assigned to anonymous user.
self._check_permissions(username, perm)
[I 2024-06-23 13:49:35] concurrency model: async
[I 2024-06-23 13:49:35] masquerade (NAT) address: None
[I 2024-06-23 13:49:35] passive ports: None
[I 2024-06-23 13:49:35] >>> starting FTP server on 0.0.0.0:2121, pid=763634 <<<

API usage
>>> from pyftpdlib.authorizers import DummyAuthorizer
>>> from pyftpdlib.handlers import FTPHandler
>>> from pyftpdlib.servers import FTPServer
>>>
>>> authorizer = DummyAuthorizer()
>>> authorizer.add_user("user", "12345", "/home/giampaolo", perm="elradfmwMT")
>>> authorizer.add_anonymous("/home/nobody")
>>>
>>> handler = FTPHandler
>>> handler.authorizer = authorizer
>>>
>>> server = FTPServer(("127.0.0.1", 21), handler)
>>> server.serve_forever()
[I 13-02-19 10:55:42] >>> starting FTP server on 127.0.0.1:21 <<<
[I 13-02-19 10:55:42] poller: <class 'pyftpdlib.ioloop.Epoll'>
[I 13-02-19 10:55:42] masquerade (NAT) address: None
[I 13-02-19 10:55:42] passive ports: None
[I 13-02-19 10:55:42] use sendfile(2): True
[I 13-02-19 10:55:45] 127.0.0.1:34178-[] FTP session opened (connect)
[I 13-02-19 10:55:48] 127.0.0.1:34178-[user] USER 'user' logged in.
[I 13-02-19 10:56:27] 127.0.0.1:34179-[user] RETR /home/giampaolo/.vimrc completed=1 bytes=1700 seconds=0.001
[I 13-02-19 10:56:39] 127.0.0.1:34179-[user] FTP session closed (disconnect).
other code samples

Donate
A lot of time and effort went into making pyftpdlib as it is right now.
If you feel pyftpdlib is useful to you or your business and want to support its
future development please consider donating me some money.