FTP explicit TLS connection Python 3.7

Question

Goodmorning everyone, I'm trying to connect with python to the ip address of my explicit FTP server on TLS ...

from ftplib import FTP_TLS

def Ftp_Transfer():
      
    ftps = FTP_TLS('ftp://username@IP:PORT')
    ftps.login(user='username', passwd='pass')

But I got this error:

Traceback (most recent call last):
  File "C:\Users\Utente\Desktop\Lavori\Organizzazione\LOG_Windows.p
y", line 13, in Ftp_Transfer
    ftps = FTP_TLS('ftp://username@IP:PORT')
  File "C:\Users\Utente\Anaconda3\lib\ftplib.py", line 745, in __init__
    FTP.__init__(self, host, user, passwd, acct, timeout, source_address)
  File "C:\Users\Utente\Anaconda3\lib\ftplib.py", line 117, in __init__
    self.connect(host)
  File "C:\Users\Utente\Anaconda3\lib\ftplib.py", line 152, in connect
    source_address=self.source_address)
  File "C:\Users\Utente\Anaconda3\lib\socket.py", line 707, in create_connection

    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
  File "C:\Users\Utente\Anaconda3\lib\socket.py", line 748, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 11003] getaddrinfo failed

Can someone help me?

Answer 1

(I bring up FileZilla because that is the only server we consistantly have problems with)

I do know that FTP_TLS does not support FileZilla servers running on modern configurations - There has been work to hack the FTP_TLS implementation, but even that doesn't work on 2020 FileZilla default configs.

We ended up running lftp from the commant-line, through Python. Please note this is a HORRIBLE idea (security vulnerability) if any input comes from an un-trusted user.

Example of our implementation below. Works for Implicit FTP over TLS:

import os
# add `;set xfer:clobber yes` to -e arguments to enable file overwrite
os.system('lftp -u %(username)s,%(password)s -e "set ssl:verify-certificate no;get %(remote_filename)s -o %(local_filename)s;exit" ftps://%(host)s' % {
        'username': USERNAME,
        'password': PASSWORD,
        'host': HOST,
        'remote_filename': '/filename-to-download.txt',
        'local_filename': '/path/to/filename.txt',
    }
)

If you don't have lftp installed, on Ubuntu you can simply run:

apt install lftp