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"""An FTP client class and some helper functions. 

 

Based on RFC 959: File Transfer Protocol (FTP), by J. Postel and J. Reynolds 

 

Example: 

 

>>> from ftplib import FTP 

>>> ftp = FTP('ftp.python.org') # connect to host, default port 

>>> ftp.login() # default, i.e.: user anonymous, passwd anonymous@ 

'230 Guest login ok, access restrictions apply.' 

>>> ftp.retrlines('LIST') # list directory contents 

total 9 

drwxr-xr-x 8 root wheel 1024 Jan 3 1994 . 

drwxr-xr-x 8 root wheel 1024 Jan 3 1994 .. 

drwxr-xr-x 2 root wheel 1024 Jan 3 1994 bin 

drwxr-xr-x 2 root wheel 1024 Jan 3 1994 etc 

d-wxrwxr-x 2 ftp wheel 1024 Sep 5 13:43 incoming 

drwxr-xr-x 2 root wheel 1024 Nov 17 1993 lib 

drwxr-xr-x 6 1094 wheel 1024 Sep 13 19:07 pub 

drwxr-xr-x 3 root wheel 1024 Jan 3 1994 usr 

-rw-r--r-- 1 root root 312 Aug 1 1994 welcome.msg 

'226 Transfer complete.' 

>>> ftp.quit() 

'221 Goodbye.' 

>>> 

 

A nice test that reveals some of the network dialogue would be: 

python ftplib.py -d localhost -l -p -l 

""" 

 

# 

# Changes and improvements suggested by Steve Majewski. 

# Modified by Jack to work on the mac. 

# Modified by Siebren to support docstrings and PASV. 

# Modified by Phil Schwartz to add storbinary and storlines callbacks. 

# Modified by Giampaolo Rodola' to add TLS support. 

# 

 

import sys 

import socket 

from socket import _GLOBAL_DEFAULT_TIMEOUT 

 

__all__ = ["FTP", "error_reply", "error_temp", "error_perm", "error_proto", 

"all_errors"] 

 

# Magic number from <socket.h> 

MSG_OOB = 0x1 # Process data out of band 

 

 

# The standard FTP server control port 

FTP_PORT = 21 

# The sizehint parameter passed to readline() calls 

MAXLINE = 8192 

 

 

# Exception raised when an error or invalid response is received 

class Error(Exception): pass 

class error_reply(Error): pass # unexpected [123]xx reply 

class error_temp(Error): pass # 4xx errors 

class error_perm(Error): pass # 5xx errors 

class error_proto(Error): pass # response does not begin with [1-5] 

 

 

# All exceptions (hopefully) that may be raised here and that aren't 

# (always) programming errors on our side 

all_errors = (Error, OSError, EOFError) 

 

 

# Line terminators (we always output CRLF, but accept any of CRLF, CR, LF) 

CRLF = '\r\n' 

B_CRLF = b'\r\n' 

 

# The class itself 

class FTP: 

 

'''An FTP client class. 

 

To create a connection, call the class using these arguments: 

host, user, passwd, acct, timeout 

 

The first four arguments are all strings, and have default value ''. 

timeout must be numeric and defaults to None if not passed, 

meaning that no timeout will be set on any ftp socket(s) 

If a timeout is passed, then this is now the default timeout for all ftp 

socket operations for this instance. 

 

Then use self.connect() with optional host and port argument. 

 

To download a file, use ftp.retrlines('RETR ' + filename), 

or ftp.retrbinary() with slightly different arguments. 

To upload a file, use ftp.storlines() or ftp.storbinary(), 

which have an open file as argument (see their definitions 

below for details). 

The download/upload functions first issue appropriate TYPE 

and PORT or PASV commands. 

''' 

 

debugging = 0 

host = '' 

port = FTP_PORT 

maxline = MAXLINE 

sock = None 

file = None 

welcome = None 

passiveserver = 1 

encoding = "latin-1" 

 

# Initialization method (called by class instantiation). 

# Initialize host to localhost, port to standard ftp port 

# Optional arguments are host (for connect()), 

# and user, passwd, acct (for login()) 

def __init__(self, host='', user='', passwd='', acct='', 

timeout=_GLOBAL_DEFAULT_TIMEOUT, source_address=None): 

self.source_address = source_address 

self.timeout = timeout 

if host: 

self.connect(host) 

if user: 

self.login(user, passwd, acct) 

 

def __enter__(self): 

return self 

 

# Context management protocol: try to quit() if active 

def __exit__(self, *args): 

if self.sock is not None: 

try: 

self.quit() 

except (OSError, EOFError): 

pass 

finally: 

if self.sock is not None: 

self.close() 

 

def connect(self, host='', port=0, timeout=-999, source_address=None): 

'''Connect to host. Arguments are: 

- host: hostname to connect to (string, default previous host) 

- port: port to connect to (integer, default previous port) 

- timeout: the timeout to set against the ftp socket(s) 

- source_address: a 2-tuple (host, port) for the socket to bind 

to as its source address before connecting. 

''' 

if host != '': 

self.host = host 

if port > 0: 

self.port = port 

if timeout != -999: 

self.timeout = timeout 

if source_address is not None: 

self.source_address = source_address 

self.sock = socket.create_connection((self.host, self.port), self.timeout, 

source_address=self.source_address) 

self.af = self.sock.family 

self.file = self.sock.makefile('r', encoding=self.encoding) 

self.welcome = self.getresp() 

return self.welcome 

 

def getwelcome(self): 

'''Get the welcome message from the server. 

(this is read and squirreled away by connect())''' 

if self.debugging: 

print('*welcome*', self.sanitize(self.welcome)) 

return self.welcome 

 

def set_debuglevel(self, level): 

'''Set the debugging level. 

The required argument level means: 

0: no debugging output (default) 

1: print commands and responses but not body text etc. 

2: also print raw lines read and sent before stripping CR/LF''' 

self.debugging = level 

debug = set_debuglevel 

 

def set_pasv(self, val): 

'''Use passive or active mode for data transfers. 

With a false argument, use the normal PORT mode, 

With a true argument, use the PASV command.''' 

self.passiveserver = val 

 

# Internal: "sanitize" a string for printing 

def sanitize(self, s): 

if s[:5] in {'pass ', 'PASS '}: 

i = len(s.rstrip('\r\n')) 

s = s[:5] + '*'*(i-5) + s[i:] 

return repr(s) 

 

# Internal: send one line to the server, appending CRLF 

def putline(self, line): 

if '\r' in line or '\n' in line: 

raise ValueError('an illegal newline character should not be contained') 

line = line + CRLF 

if self.debugging > 1: 

print('*put*', self.sanitize(line)) 

self.sock.sendall(line.encode(self.encoding)) 

 

# Internal: send one command to the server (through putline()) 

def putcmd(self, line): 

if self.debugging: print('*cmd*', self.sanitize(line)) 

self.putline(line) 

 

# Internal: return one line from the server, stripping CRLF. 

# Raise EOFError if the connection is closed 

def getline(self): 

line = self.file.readline(self.maxline + 1) 

if len(line) > self.maxline: 

raise Error("got more than %d bytes" % self.maxline) 

if self.debugging > 1: 

print('*get*', self.sanitize(line)) 

if not line: 

raise EOFError 

if line[-2:] == CRLF: 

line = line[:-2] 

elif line[-1:] in CRLF: 

line = line[:-1] 

return line 

 

# Internal: get a response from the server, which may possibly 

# consist of multiple lines. Return a single string with no 

# trailing CRLF. If the response consists of multiple lines, 

# these are separated by '\n' characters in the string 

def getmultiline(self): 

line = self.getline() 

if line[3:4] == '-': 

code = line[:3] 

while 1: 

nextline = self.getline() 

line = line + ('\n' + nextline) 

if nextline[:3] == code and \ 

nextline[3:4] != '-': 

break 

return line 

 

# Internal: get a response from the server. 

# Raise various errors if the response indicates an error 

def getresp(self): 

resp = self.getmultiline() 

if self.debugging: 

print('*resp*', self.sanitize(resp)) 

self.lastresp = resp[:3] 

c = resp[:1] 

if c in {'1', '2', '3'}: 

return resp 

if c == '4': 

raise error_temp(resp) 

if c == '5': 

raise error_perm(resp) 

raise error_proto(resp) 

 

def voidresp(self): 

"""Expect a response beginning with '2'.""" 

resp = self.getresp() 

if resp[:1] != '2': 

raise error_reply(resp) 

return resp 

 

def abort(self): 

'''Abort a file transfer. Uses out-of-band data. 

This does not follow the procedure from the RFC to send Telnet 

IP and Synch; that doesn't seem to work with the servers I've 

tried. Instead, just send the ABOR command as OOB data.''' 

line = b'ABOR' + B_CRLF 

if self.debugging > 1: 

print('*put urgent*', self.sanitize(line)) 

self.sock.sendall(line, MSG_OOB) 

resp = self.getmultiline() 

if resp[:3] not in {'426', '225', '226'}: 

raise error_proto(resp) 

return resp 

 

def sendcmd(self, cmd): 

'''Send a command and return the response.''' 

self.putcmd(cmd) 

return self.getresp() 

 

def voidcmd(self, cmd): 

"""Send a command and expect a response beginning with '2'.""" 

self.putcmd(cmd) 

return self.voidresp() 

 

def sendport(self, host, port): 

'''Send a PORT command with the current host and the given 

port number. 

''' 

hbytes = host.split('.') 

pbytes = [repr(port//256), repr(port%256)] 

bytes = hbytes + pbytes 

cmd = 'PORT ' + ','.join(bytes) 

return self.voidcmd(cmd) 

 

def sendeprt(self, host, port): 

'''Send an EPRT command with the current host and the given port number.''' 

af = 0 

if self.af == socket.AF_INET: 

af = 1 

if self.af == socket.AF_INET6: 

af = 2 

if af == 0: 

raise error_proto('unsupported address family') 

fields = ['', repr(af), host, repr(port), ''] 

cmd = 'EPRT ' + '|'.join(fields) 

return self.voidcmd(cmd) 

 

def makeport(self): 

'''Create a new socket and send a PORT command for it.''' 

err = None 

sock = None 

for res in socket.getaddrinfo(None, 0, self.af, socket.SOCK_STREAM, 0, socket.AI_PASSIVE): 

af, socktype, proto, canonname, sa = res 

try: 

sock = socket.socket(af, socktype, proto) 

sock.bind(sa) 

except OSError as _: 

err = _ 

if sock: 

sock.close() 

sock = None 

continue 

break 

if sock is None: 

if err is not None: 

raise err 

else: 

raise OSError("getaddrinfo returns an empty list") 

sock.listen(1) 

port = sock.getsockname()[1] # Get proper port 

host = self.sock.getsockname()[0] # Get proper host 

if self.af == socket.AF_INET: 

resp = self.sendport(host, port) 

else: 

resp = self.sendeprt(host, port) 

if self.timeout is not _GLOBAL_DEFAULT_TIMEOUT: 

sock.settimeout(self.timeout) 

return sock 

 

def makepasv(self): 

if self.af == socket.AF_INET: 

host, port = parse227(self.sendcmd('PASV')) 

else: 

host, port = parse229(self.sendcmd('EPSV'), self.sock.getpeername()) 

return host, port 

 

def ntransfercmd(self, cmd, rest=None): 

"""Initiate a transfer over the data connection. 

 

If the transfer is active, send a port command and the 

transfer command, and accept the connection. If the server is 

passive, send a pasv command, connect to it, and start the 

transfer command. Either way, return the socket for the 

connection and the expected size of the transfer. The 

expected size may be None if it could not be determined. 

 

Optional `rest' argument can be a string that is sent as the 

argument to a REST command. This is essentially a server 

marker used to tell the server to skip over any data up to the 

given marker. 

""" 

size = None 

if self.passiveserver: 

host, port = self.makepasv() 

conn = socket.create_connection((host, port), self.timeout, 

source_address=self.source_address) 

try: 

if rest is not None: 

self.sendcmd("REST %s" % rest) 

resp = self.sendcmd(cmd) 

# Some servers apparently send a 200 reply to 

# a LIST or STOR command, before the 150 reply 

# (and way before the 226 reply). This seems to 

# be in violation of the protocol (which only allows 

# 1xx or error messages for LIST), so we just discard 

# this response. 

if resp[0] == '2': 

resp = self.getresp() 

if resp[0] != '1': 

raise error_reply(resp) 

except: 

conn.close() 

raise 

else: 

with self.makeport() as sock: 

if rest is not None: 

self.sendcmd("REST %s" % rest) 

resp = self.sendcmd(cmd) 

# See above. 

if resp[0] == '2': 

resp = self.getresp() 

if resp[0] != '1': 

raise error_reply(resp) 

conn, sockaddr = sock.accept() 

if self.timeout is not _GLOBAL_DEFAULT_TIMEOUT: 

conn.settimeout(self.timeout) 

if resp[:3] == '150': 

# this is conditional in case we received a 125 

size = parse150(resp) 

return conn, size 

 

def transfercmd(self, cmd, rest=None): 

"""Like ntransfercmd() but returns only the socket.""" 

return self.ntransfercmd(cmd, rest)[0] 

 

def login(self, user = '', passwd = '', acct = ''): 

'''Login, default anonymous.''' 

if not user: 

user = 'anonymous' 

if not passwd: 

passwd = '' 

if not acct: 

acct = '' 

if user == 'anonymous' and passwd in {'', '-'}: 

# If there is no anonymous ftp password specified 

# then we'll just use anonymous@ 

# We don't send any other thing because: 

# - We want to remain anonymous 

# - We want to stop SPAM 

# - We don't want to let ftp sites to discriminate by the user, 

# host or country. 

passwd = passwd + 'anonymous@' 

resp = self.sendcmd('USER ' + user) 

if resp[0] == '3': 

resp = self.sendcmd('PASS ' + passwd) 

if resp[0] == '3': 

resp = self.sendcmd('ACCT ' + acct) 

if resp[0] != '2': 

raise error_reply(resp) 

return resp 

 

def retrbinary(self, cmd, callback, blocksize=8192, rest=None): 

"""Retrieve data in binary mode. A new port is created for you. 

 

Args: 

cmd: A RETR command. 

callback: A single parameter callable to be called on each 

block of data read. 

blocksize: The maximum number of bytes to read from the 

socket at one time. [default: 8192] 

rest: Passed to transfercmd(). [default: None] 

 

Returns: 

The response code. 

""" 

self.voidcmd('TYPE I') 

with self.transfercmd(cmd, rest) as conn: 

while 1: 

data = conn.recv(blocksize) 

if not data: 

break 

callback(data) 

# shutdown ssl layer 

if _SSLSocket is not None and isinstance(conn, _SSLSocket): 

conn.unwrap() 

return self.voidresp() 

 

def retrlines(self, cmd, callback = None): 

"""Retrieve data in line mode. A new port is created for you. 

 

Args: 

cmd: A RETR, LIST, or NLST command. 

callback: An optional single parameter callable that is called 

for each line with the trailing CRLF stripped. 

[default: print_line()] 

 

Returns: 

The response code. 

""" 

if callback is None: 

callback = print_line 

resp = self.sendcmd('TYPE A') 

with self.transfercmd(cmd) as conn, \ 

conn.makefile('r', encoding=self.encoding) as fp: 

while 1: 

line = fp.readline(self.maxline + 1) 

if len(line) > self.maxline: 

raise Error("got more than %d bytes" % self.maxline) 

if self.debugging > 2: 

print('*retr*', repr(line)) 

if not line: 

break 

if line[-2:] == CRLF: 

line = line[:-2] 

elif line[-1:] == '\n': 

line = line[:-1] 

callback(line) 

# shutdown ssl layer 

if _SSLSocket is not None and isinstance(conn, _SSLSocket): 

conn.unwrap() 

return self.voidresp() 

 

def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None): 

"""Store a file in binary mode. A new port is created for you. 

 

Args: 

cmd: A STOR command. 

fp: A file-like object with a read(num_bytes) method. 

blocksize: The maximum data size to read from fp and send over 

the connection at once. [default: 8192] 

callback: An optional single parameter callable that is called on 

each block of data after it is sent. [default: None] 

rest: Passed to transfercmd(). [default: None] 

 

Returns: 

The response code. 

""" 

self.voidcmd('TYPE I') 

with self.transfercmd(cmd, rest) as conn: 

while 1: 

buf = fp.read(blocksize) 

if not buf: 

break 

conn.sendall(buf) 

if callback: 

callback(buf) 

# shutdown ssl layer 

if _SSLSocket is not None and isinstance(conn, _SSLSocket): 

conn.unwrap() 

return self.voidresp() 

 

def storlines(self, cmd, fp, callback=None): 

"""Store a file in line mode. A new port is created for you. 

 

Args: 

cmd: A STOR command. 

fp: A file-like object with a readline() method. 

callback: An optional single parameter callable that is called on 

each line after it is sent. [default: None] 

 

Returns: 

The response code. 

""" 

self.voidcmd('TYPE A') 

with self.transfercmd(cmd) as conn: 

while 1: 

buf = fp.readline(self.maxline + 1) 

if len(buf) > self.maxline: 

raise Error("got more than %d bytes" % self.maxline) 

if not buf: 

break 

if buf[-2:] != B_CRLF: 

if buf[-1] in B_CRLF: buf = buf[:-1] 

buf = buf + B_CRLF 

conn.sendall(buf) 

if callback: 

callback(buf) 

# shutdown ssl layer 

if _SSLSocket is not None and isinstance(conn, _SSLSocket): 

conn.unwrap() 

return self.voidresp() 

 

def acct(self, password): 

'''Send new account name.''' 

cmd = 'ACCT ' + password 

return self.voidcmd(cmd) 

 

def nlst(self, *args): 

'''Return a list of files in a given directory (default the current).''' 

cmd = 'NLST' 

for arg in args: 

cmd = cmd + (' ' + arg) 

files = [] 

self.retrlines(cmd, files.append) 

return files 

 

def dir(self, *args): 

'''List a directory in long form. 

By default list current directory to stdout. 

Optional last argument is callback function; all 

non-empty arguments before it are concatenated to the 

LIST command. (This *should* only be used for a pathname.)''' 

cmd = 'LIST' 

func = None 

if args[-1:] and type(args[-1]) != type(''): 

args, func = args[:-1], args[-1] 

for arg in args: 

if arg: 

cmd = cmd + (' ' + arg) 

self.retrlines(cmd, func) 

 

def mlsd(self, path="", facts=[]): 

'''List a directory in a standardized format by using MLSD 

command (RFC-3659). If path is omitted the current directory 

is assumed. "facts" is a list of strings representing the type 

of information desired (e.g. ["type", "size", "perm"]). 

 

Return a generator object yielding a tuple of two elements 

for every file found in path. 

First element is the file name, the second one is a dictionary 

including a variable number of "facts" depending on the server 

and whether "facts" argument has been provided. 

''' 

if facts: 

self.sendcmd("OPTS MLST " + ";".join(facts) + ";") 

if path: 

cmd = "MLSD %s" % path 

else: 

cmd = "MLSD" 

lines = [] 

self.retrlines(cmd, lines.append) 

for line in lines: 

facts_found, _, name = line.rstrip(CRLF).partition(' ') 

entry = {} 

for fact in facts_found[:-1].split(";"): 

key, _, value = fact.partition("=") 

entry[key.lower()] = value 

yield (name, entry) 

 

def rename(self, fromname, toname): 

'''Rename a file.''' 

resp = self.sendcmd('RNFR ' + fromname) 

if resp[0] != '3': 

raise error_reply(resp) 

return self.voidcmd('RNTO ' + toname) 

 

def delete(self, filename): 

'''Delete a file.''' 

resp = self.sendcmd('DELE ' + filename) 

if resp[:3] in {'250', '200'}: 

return resp 

else: 

raise error_reply(resp) 

 

def cwd(self, dirname): 

'''Change to a directory.''' 

if dirname == '..': 

try: 

return self.voidcmd('CDUP') 

except error_perm as msg: 

if msg.args[0][:3] != '500': 

raise 

elif dirname == '': 

dirname = '.' # does nothing, but could return error 

cmd = 'CWD ' + dirname 

return self.voidcmd(cmd) 

 

def size(self, filename): 

'''Retrieve the size of a file.''' 

# The SIZE command is defined in RFC-3659 

resp = self.sendcmd('SIZE ' + filename) 

if resp[:3] == '213': 

s = resp[3:].strip() 

return int(s) 

 

def mkd(self, dirname): 

'''Make a directory, return its full pathname.''' 

resp = self.voidcmd('MKD ' + dirname) 

# fix around non-compliant implementations such as IIS shipped 

# with Windows server 2003 

if not resp.startswith('257'): 

return '' 

return parse257(resp) 

 

def rmd(self, dirname): 

'''Remove a directory.''' 

return self.voidcmd('RMD ' + dirname) 

 

def pwd(self): 

'''Return current working directory.''' 

resp = self.voidcmd('PWD') 

# fix around non-compliant implementations such as IIS shipped 

# with Windows server 2003 

if not resp.startswith('257'): 

return '' 

return parse257(resp) 

 

def quit(self): 

'''Quit, and close the connection.''' 

resp = self.voidcmd('QUIT') 

self.close() 

return resp 

 

def close(self): 

'''Close the connection without assuming anything about it.''' 

try: 

file = self.file 

self.file = None 

if file is not None: 

file.close() 

finally: 

sock = self.sock 

self.sock = None 

if sock is not None: 

sock.close() 

 

try: 

import ssl 

except ImportError: 

_SSLSocket = None 

else: 

_SSLSocket = ssl.SSLSocket 

 

class FTP_TLS(FTP): 

'''A FTP subclass which adds TLS support to FTP as described 

in RFC-4217. 

 

Connect as usual to port 21 implicitly securing the FTP control 

connection before authenticating. 

 

Securing the data connection requires user to explicitly ask 

for it by calling prot_p() method. 

 

Usage example: 

>>> from ftplib import FTP_TLS 

>>> ftps = FTP_TLS('ftp.python.org') 

>>> ftps.login() # login anonymously previously securing control channel 

'230 Guest login ok, access restrictions apply.' 

>>> ftps.prot_p() # switch to secure data connection 

'200 Protection level set to P' 

>>> ftps.retrlines('LIST') # list directory content securely 

total 9 

drwxr-xr-x 8 root wheel 1024 Jan 3 1994 . 

drwxr-xr-x 8 root wheel 1024 Jan 3 1994 .. 

drwxr-xr-x 2 root wheel 1024 Jan 3 1994 bin 

drwxr-xr-x 2 root wheel 1024 Jan 3 1994 etc 

d-wxrwxr-x 2 ftp wheel 1024 Sep 5 13:43 incoming 

drwxr-xr-x 2 root wheel 1024 Nov 17 1993 lib 

drwxr-xr-x 6 1094 wheel 1024 Sep 13 19:07 pub 

drwxr-xr-x 3 root wheel 1024 Jan 3 1994 usr 

-rw-r--r-- 1 root root 312 Aug 1 1994 welcome.msg 

'226 Transfer complete.' 

>>> ftps.quit() 

'221 Goodbye.' 

>>> 

''' 

ssl_version = ssl.PROTOCOL_SSLv23 

 

def __init__(self, host='', user='', passwd='', acct='', keyfile=None, 

certfile=None, context=None, 

timeout=_GLOBAL_DEFAULT_TIMEOUT, source_address=None): 

if context is not None and keyfile is not None: 

raise ValueError("context and keyfile arguments are mutually " 

"exclusive") 

if context is not None and certfile is not None: 

raise ValueError("context and certfile arguments are mutually " 

"exclusive") 

if keyfile is not None or certfile is not None: 

import warnings 

warnings.warn("keyfile and certfile are deprecated, use a" 

"custom context instead", DeprecationWarning, 2) 

self.keyfile = keyfile 

self.certfile = certfile 

if context is None: 

context = ssl._create_stdlib_context(self.ssl_version, 

certfile=certfile, 

keyfile=keyfile) 

self.context = context 

self._prot_p = False 

FTP.__init__(self, host, user, passwd, acct, timeout, source_address) 

 

def login(self, user='', passwd='', acct='', secure=True): 

if secure and not isinstance(self.sock, ssl.SSLSocket): 

self.auth() 

return FTP.login(self, user, passwd, acct) 

 

def auth(self): 

'''Set up secure control connection by using TLS/SSL.''' 

if isinstance(self.sock, ssl.SSLSocket): 

raise ValueError("Already using TLS") 

if self.ssl_version >= ssl.PROTOCOL_SSLv23: 

resp = self.voidcmd('AUTH TLS') 

else: 

resp = self.voidcmd('AUTH SSL') 

self.sock = self.context.wrap_socket(self.sock, 

server_hostname=self.host) 

self.file = self.sock.makefile(mode='r', encoding=self.encoding) 

return resp 

 

def ccc(self): 

'''Switch back to a clear-text control connection.''' 

if not isinstance(self.sock, ssl.SSLSocket): 

raise ValueError("not using TLS") 

resp = self.voidcmd('CCC') 

self.sock = self.sock.unwrap() 

return resp 

 

def prot_p(self): 

'''Set up secure data connection.''' 

# PROT defines whether or not the data channel is to be protected. 

# Though RFC-2228 defines four possible protection levels, 

# RFC-4217 only recommends two, Clear and Private. 

# Clear (PROT C) means that no security is to be used on the 

# data-channel, Private (PROT P) means that the data-channel 

# should be protected by TLS. 

# PBSZ command MUST still be issued, but must have a parameter of 

# '0' to indicate that no buffering is taking place and the data 

# connection should not be encapsulated. 

self.voidcmd('PBSZ 0') 

resp = self.voidcmd('PROT P') 

self._prot_p = True 

return resp 

 

def prot_c(self): 

'''Set up clear text data connection.''' 

resp = self.voidcmd('PROT C') 

self._prot_p = False 

return resp 

 

# --- Overridden FTP methods 

 

def ntransfercmd(self, cmd, rest=None): 

conn, size = FTP.ntransfercmd(self, cmd, rest) 

if self._prot_p: 

conn = self.context.wrap_socket(conn, 

server_hostname=self.host) 

return conn, size 

 

def abort(self): 

# overridden as we can't pass MSG_OOB flag to sendall() 

line = b'ABOR' + B_CRLF 

self.sock.sendall(line) 

resp = self.getmultiline() 

if resp[:3] not in {'426', '225', '226'}: 

raise error_proto(resp) 

return resp 

 

__all__.append('FTP_TLS') 

all_errors = (Error, OSError, EOFError, ssl.SSLError) 

 

 

_150_re = None 

 

def parse150(resp): 

'''Parse the '150' response for a RETR request. 

Returns the expected transfer size or None; size is not guaranteed to 

be present in the 150 message. 

''' 

if resp[:3] != '150': 

raise error_reply(resp) 

global _150_re 

if _150_re is None: 

import re 

_150_re = re.compile( 

r"150 .* \((\d+) bytes\)", re.IGNORECASE | re.ASCII) 

m = _150_re.match(resp) 

if not m: 

return None 

return int(m.group(1)) 

 

 

_227_re = None 

 

def parse227(resp): 

'''Parse the '227' response for a PASV request. 

Raises error_proto if it does not contain '(h1,h2,h3,h4,p1,p2)' 

Return ('host.addr.as.numbers', port#) tuple.''' 

 

if resp[:3] != '227': 

raise error_reply(resp) 

global _227_re 

if _227_re is None: 

import re 

_227_re = re.compile(r'(\d+),(\d+),(\d+),(\d+),(\d+),(\d+)', re.ASCII) 

m = _227_re.search(resp) 

if not m: 

raise error_proto(resp) 

numbers = m.groups() 

host = '.'.join(numbers[:4]) 

port = (int(numbers[4]) << 8) + int(numbers[5]) 

return host, port 

 

 

def parse229(resp, peer): 

'''Parse the '229' response for an EPSV request. 

Raises error_proto if it does not contain '(|||port|)' 

Return ('host.addr.as.numbers', port#) tuple.''' 

 

if resp[:3] != '229': 

raise error_reply(resp) 

left = resp.find('(') 

if left < 0: raise error_proto(resp) 

right = resp.find(')', left + 1) 

if right < 0: 

raise error_proto(resp) # should contain '(|||port|)' 

if resp[left + 1] != resp[right - 1]: 

raise error_proto(resp) 

parts = resp[left + 1:right].split(resp[left+1]) 

if len(parts) != 5: 

raise error_proto(resp) 

host = peer[0] 

port = int(parts[3]) 

return host, port 

 

 

def parse257(resp): 

'''Parse the '257' response for a MKD or PWD request. 

This is a response to a MKD or PWD request: a directory name. 

Returns the directoryname in the 257 reply.''' 

 

if resp[:3] != '257': 

raise error_reply(resp) 

if resp[3:5] != ' "': 

return '' # Not compliant to RFC 959, but UNIX ftpd does this 

dirname = '' 

i = 5 

n = len(resp) 

while i < n: 

c = resp[i] 

i = i+1 

if c == '"': 

if i >= n or resp[i] != '"': 

break 

i = i+1 

dirname = dirname + c 

return dirname 

 

 

def print_line(line): 

'''Default retrlines callback to print a line.''' 

print(line) 

 

 

def ftpcp(source, sourcename, target, targetname = '', type = 'I'): 

'''Copy file from one FTP-instance to another.''' 

if not targetname: 

targetname = sourcename 

type = 'TYPE ' + type 

source.voidcmd(type) 

target.voidcmd(type) 

sourcehost, sourceport = parse227(source.sendcmd('PASV')) 

target.sendport(sourcehost, sourceport) 

# RFC 959: the user must "listen" [...] BEFORE sending the 

# transfer request. 

# So: STOR before RETR, because here the target is a "user". 

treply = target.sendcmd('STOR ' + targetname) 

if treply[:3] not in {'125', '150'}: 

raise error_proto # RFC 959 

sreply = source.sendcmd('RETR ' + sourcename) 

if sreply[:3] not in {'125', '150'}: 

raise error_proto # RFC 959 

source.voidresp() 

target.voidresp() 

 

 

def test(): 

'''Test program. 

Usage: ftp [-d] [-r[file]] host [-l[dir]] [-d[dir]] [-p] [file] ... 

 

-d dir 

-l list 

-p password 

''' 

 

if len(sys.argv) < 2: 

print(test.__doc__) 

sys.exit(0) 

 

import netrc 

 

debugging = 0 

rcfile = None 

while sys.argv[1] == '-d': 

debugging = debugging+1 

del sys.argv[1] 

if sys.argv[1][:2] == '-r': 

# get name of alternate ~/.netrc file: 

rcfile = sys.argv[1][2:] 

del sys.argv[1] 

host = sys.argv[1] 

ftp = FTP(host) 

ftp.set_debuglevel(debugging) 

userid = passwd = acct = '' 

try: 

netrcobj = netrc.netrc(rcfile) 

except OSError: 

if rcfile is not None: 

sys.stderr.write("Could not open account file" 

" -- using anonymous login.") 

else: 

try: 

userid, acct, passwd = netrcobj.authenticators(host) 

except KeyError: 

# no account for host 

sys.stderr.write( 

"No account -- using anonymous login.") 

ftp.login(userid, passwd, acct) 

for file in sys.argv[2:]: 

if file[:2] == '-l': 

ftp.dir(file[2:]) 

elif file[:2] == '-d': 

cmd = 'CWD' 

if file[2:]: cmd = cmd + ' ' + file[2:] 

resp = ftp.sendcmd(cmd) 

elif file == '-p': 

ftp.set_pasv(not ftp.passiveserver) 

else: 

ftp.retrbinary('RETR ' + file, \ 

sys.stdout.write, 1024) 

ftp.quit() 

 

 

if __name__ == '__main__': 

test()