An FTP client library for MicroPython.
This is an adaption of the ftplib module from the CPython standard library to
MicroPython. Apart from making it compatible with the socket module
implementation of MicroPython and removing the use of the re library, some
parts of the original library have been removed and the code and docstrings
have been cleaned up somewhat.
The FTP_TLS class has been moved to a separate module file (ftplibtls.py)
and the all_errors module global variable has been removed. The test code has
been moved to a separate script and reworked too. The ftpcp function has been
moved to the ftpcp.py module file.
The code has been tested under the following MicroPython ports against the FTP server from the pyftpdlib package.
unixstm32(using W5500 ethernet module)esp8266esp32rp2(Raspberry Pi Pico W)
For the esp8266 port the code needed to be slighty altered to make it work
with the ssl module there and to reduce the memory usage. This version can
be found in the esp directory (this version also works with the
esp32 port, but there you should be able to use the normal version too).
FTP-over-TLS support is available in a separate ftplibtls module:
>>> from ftplibtls import FTP_TLS
>>> ftp = FTP_TLS('example.com') # default port 21
>>> ftp.login('username', 'password')
>>> ftp.prot_p()
>>> ftp.retrlines('LIST')Note that you must call the prot_b method after connecting and
authentication to actually establish secure communication for data transfers.
If you require server certificate validation (recommended):
>>> from ftplib import FTP_TLS, ssl
>>> ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
>>> ctx.verify_mode = ssl.CERT_REQUIRED
>>> ctx.load_verify_locations(cafile="cert.der") # Certificate file must be in DER format
>>> ftp = FTP_TLS(ssl_context=ctx, server_hostname="example.com")
>>> ftp.connect('example.com')
>>> ftp.prot_p()
>>> ftp.retrlines('LIST')Use the server_hostname constructor argument if the common name in the
server's certificate differs from the host name used for connecting.
Note: the version of ftplibtls in the esp directory does not support the
ssl_context and server_hostname constructor arguments, since the ssl
module of the esp2866 port unfortunately does not support server certificate
validation.
The tests directory contains the pyftplib-server.py script to start an FTP
server, which is based on the pyftpdlib library for CPython and which
supports FTP over TLS.
To run this script with TLS support enabled, you first need to create a server certificate. For testing, a self-signed certificate can be used and created with:
openssl req -new -x509 -nodes -out cert.pem -keyout tests/key.pem
Specify the country, code, location, organization and common name, when
prompted. (Note: the test scripts in the tests directory assume that the
common name you choose is example.com. If you choose a different common name,
these scripts will fail with an error due to certificate verification failure.)
Combine the server certificate and the key into one file:
cat tests/key.pem tests/cert.pem > tests/keycert.pem
The ftplibtls module needs the server certificate in DER format, so convert
it with:
openssl x509 -in tests/cert.pem -out tests/cert.der -outform DER
Now you can start the test FTP server:
mkdir -p tests/ftproot
python3 tests/pyftpdlib-server.py -w -s -p 2121 -c tests/keycert.pem tests/ftproot
The FTP server will listen on port 2121, support TLS using the certificate in the
file tests/keycert.pem and allow clients to read files from the directory
tests/ftproot and also upload files there.
To upload a file to the test FTP server using the ftplibtls module, run the
tests/test_upload.py script:
MICROPYPATH=`pwd` micropython tests/test_upload.py ftps://localhost:2121 <filename>
This should upload the file <filename> to the FTP server using FTP over TLS
and the file should appear in the tests/ftproot directory.
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