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"""M2Crypto client-side FTP/TLS.

This implementation complies with draft-murray-auth-ftp-ssl-07.txt.

Example:

>>> from M2Crypto import ftpslib
>>> f = ftpslib.FTP_TLS()
>>> f.connect('', 9021)
'220 spinnaker.dyndns.org M2Crypto (Medusa) FTP/TLS server v0.07 ready.'
>>> f.auth_tls()
>>> f.set_pasv(0)
>>> f.login('ftp', 'ngps@')
'230 Ok.'
>>> f.retrlines('LIST')
-rw-rw-r--   1 0        198          2326 Jul  3  1996 apache_pb.gif
drwxrwxr-x   7 0        198          1536 Oct 10  2000 manual
drwxrwxr-x   2 0        198           512 Oct 31  2000 modpy
drwxrwxr-x   2 0        198           512 Oct 31  2000 bobo
drwxr-xr-x   2 0        198         14336 May 28 15:54 postgresql
drwxr-xr-x   4 100      198           512 May 16 17:19 home
drwxr-xr-x   7 100      100          3584 Sep 23  2000 openacs
drwxr-xr-x  10 0        0             512 Aug  5  2000 python1.5
-rw-r--r--   1 100      198           326 Jul 29 03:29 index.html
drwxr-xr-x  12 0        0             512 May 31 17:08 python2.1
'226 Transfer complete'
>>> f.quit()
'221 Goodbye.'
>>>


Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""

# Python
from ftplib import *
from ftplib import parse150, parse227
from ftplib import error_reply, error_temp, error_perm, error_proto
import socket, time

# M2Crypto
import SSL

DEFAULT_PROTOCOL='sslv23'

class FTP_TLS(FTP):

    """Python OO interface to client-side FTP/TLS."""

    def __init__(self, host=None, ssl_ctx=None):
        """Initialise the client. If 'host' is supplied, connect to it."""
        if ssl_ctx is not None:
            self.ssl_ctx = ssl_ctx
        else:
            self.ssl_ctx = SSL.Context(DEFAULT_PROTOCOL)
        FTP.__init__(self, host)
        self.prot = 0

    def auth_tls(self):
        """Secure the control connection per AUTH TLS, aka AUTH TLS-C."""
        self.voidcmd('AUTH TLS')
        s = SSL.Connection(self.ssl_ctx, self.sock)
        s.setup_ssl()
        s.set_connect_state()
        s.connect_ssl()
        self.sock = s
        self.file = self.sock.makefile()

    def auth_ssl(self):
        """Secure the control connection per AUTH SSL, aka AUTH TLS-P."""
        raise NotImplementedError

    def prot_p(self):
        """Set up secure data connection."""
        self.voidcmd('PBSZ 0')
        self.voidcmd('PROT P')
        self.prot = 1
            
    def prot_c(self):
        """Set up data connection in the clear."""
        self.voidcmd('PROT C')
        self.prot = 0
            
    def ntransfercmd(self, cmd, rest=None):
        """Initiate a data transfer."""
        conn, size = FTP.ntransfercmd(self, cmd, rest)
        if self.prot:
            conn = SSL.Connection(self.ssl_ctx, conn)
            conn.setup_ssl()
            conn.set_connect_state()
            conn.set_session(self.sock.get_session())
            conn.connect_ssl()
        return conn, size
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