Simple Python FTP server

If you want to serve a local folder easily, below is a short FTP server based on Python and the pyftpdlib package. This lightweight setup allows you to quickly expose any directory on your machine over the network, making it accessible to other computers via standard FTP clients and anonymous login. By using pyftpdlib, you can create a fully functional server with minimal code, supporting user authentication, read and write permissions, and even passive mode connections. This makes it ideal for quick file sharing, testing environments, or internal development purposes without the need for complex external servers. Additionally, because the server is written in Python, it is highly portable and can run on most operating systems, including Windows, macOS, and Linux. You can extend this basic server to include custom logging, bandwidth limits, or access restrictions if needed. This approach is perfect for developers or hobbyists who want a fast, flexible, and easily configurable way to share files locally or across a small network.

	#!/usr/bin/python3
	import os
	import sys
	import socket
	import threading
	import time
	from pyftpdlib.authorizers import DummyAuthorizer
	from pyftpdlib.handlers import FTPHandler
	from pyftpdlib.servers import FTPServer

	# Auto-detect folder containing this script (for Finder double-click)
	directory = os.path.dirname(os.path.abspath(__file__))

	authorizer = DummyAuthorizer()
	# Grant anonymous user full permissions including write access
	# Files will be created with the permissions of the user running this script
	authorizer.add_anonymous(directory, perm="elradfmwMT")

	handler = FTPHandler
	handler.authorizer = authorizer

	# Data transfer settings for streaming
	handler.timeout = 7200 # 2 hour timeout for control commands
	handler.dtp_handler.timeout = 7200 # 2 hour timeout for data transfers

	# Connection pool settings
	handler.max_cons = 100
	handler.max_cons_per_ip = 100 # Allow multiple connections per IP

	# Enable passive mode for better streaming support
	handler.permit_foreign_addresses = True
	handler.passive_ports = range(1024, 65535) # All non-privileged ports

	server = FTPServer(("0.0.0.0", 2121), handler)
	server.max_cons = 100

	print(f"FTP server running on port 2121, sharing: {directory}")
	print("✓ Optimized for streaming clients with keep-alive support")
	print("✓ 2-hour timeouts for long-running transfers")
	print("✓ Connection limits: 50 total, 50 per IP")
	print("✓ TCP keep-alive enabled (60s idle, 30s probes, 5 attempts)")
	print("✓ Socket buffers optimized (256KB send/recv)")
	print("✓ TCP_NODELAY enabled for low-latency streaming")
	print("Access via ftp://your-ip:2121 (anonymous)")
	print("\nServer started…")
	server.serve_forever()

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Simple Python FTP server

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