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May 25, 2024 09:40
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Fork of Python stdlib ftp client that uses pyOpenSSL
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| """ | |
| Standard library code adapted to support testing. | |
| Fork of standard library code, started as a backport of Python ftplib from 2.7 | |
| to 2.5, and updated with some inspiration from Python 3.8. | |
| https://github.com/python/cpython/blob/3.8/Lib/ftplib.py | |
| This is a quick and dirty port. | |
| pyOpenSSL is used instead of the standard ssl module. | |
| On top of the port, a few extra functionalities were added; | |
| * Add support for FTPS CCC | |
| * Add support for Implicit FTPS | |
| * Allow explicit usage of extended commands. | |
| * Raise an explicit error if command channel was not properly closed. | |
| * Allow using an explicit cipher list. | |
| * Allow using an explicit SSL/TLS method. | |
| * Allow checking server identity. | |
| ------------------ | |
| 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. | |
| # | |
| from __future__ import print_function | |
| from __future__ import absolute_import | |
| import errno | |
| import os | |
| import sys | |
| import time | |
| import six | |
| # Import SOCKS module if it exists, else standard socket module socket | |
| try: | |
| import SOCKS | |
| socket = SOCKS | |
| del SOCKS # import SOCKS as socket | |
| from socket import getfqdn | |
| socket.getfqdn = getfqdn | |
| del getfqdn | |
| except ImportError: | |
| import socket | |
| import OpenSSL.SSL as ssl | |
| if six.PY3 or ssl.OPENSSL_VERSION_NUMBER > 0x10101000: | |
| OPENSSL_SECLEVEL = '@SECLEVEL=0' | |
| else: | |
| # Seclevel not supported. | |
| OPENSSL_SECLEVEL = '' | |
| _GLOBAL_DEFAULT_TIMEOUT = 5 | |
| __all__ = ["FTP", "Netrc", 'FTP_TLS', 'FTP_TLSI'] | |
| # Magic number from <socket.h> | |
| MSG_OOB = 0x1 # Process data out of band | |
| # The standard FTP server control port | |
| FTP_PORT = 21 | |
| # Exception raised when an error or invalid response is received | |
| class Error(Exception): pass | |
| class error_closed(Error): pass # Connection is already closed. | |
| 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, EnvironmentError, EOFError) | |
| def _read_line(fp): | |
| """ | |
| Read a line in text mode. | |
| """ | |
| result = _read_binary_line(fp) | |
| if six.PY2: | |
| return result.decode('utf-8') | |
| return result | |
| def _read_binary_line(fp): | |
| """ | |
| Helper to read a line and handle various socket errors. | |
| """ | |
| try: | |
| return fp.readline() | |
| except Exception as error: | |
| if error.args[0] == 10054: | |
| # On Windows the socket was already closed. | |
| return b'' | |
| raise | |
| # 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, encoding | |
| 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. | |
| The last parameter is the encoding of filenames and storlines output. | |
| 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 | |
| sock = None | |
| file = None | |
| welcome = None | |
| passiveserver = True | |
| extended_address = True | |
| last_passive_host = None | |
| last_passive_port = None | |
| # Data to send soon after the connection. | |
| # Can be used to inject PROXY protocol data. | |
| # It should be a tuple for the command channel data and the passive | |
| # port data. | |
| connect_data = () | |
| def __init__(self, host='', user='', passwd='', acct='', | |
| timeout=_GLOBAL_DEFAULT_TIMEOUT, encoding='utf-8'): | |
| """ | |
| 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()). | |
| """ | |
| self.encoding = encoding | |
| self.timeout = timeout | |
| if host: | |
| self.connect(host) | |
| if user: | |
| self.login(user, passwd, acct) | |
| def connect(self, host='', port=0, timeout=-999): | |
| """ | |
| 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) | |
| """ | |
| if host != '': | |
| self.host = host | |
| if port > 0: | |
| self.port = port | |
| if timeout != -999: | |
| self.timeout = timeout | |
| msg = "getaddrinfo returns an empty list" | |
| for res in socket.getaddrinfo( | |
| self.host, self.port, 0, socket.SOCK_STREAM): | |
| af, socktype, proto, canonname, sa = res | |
| try: | |
| self.sock = socket.socket(af, socktype, proto) | |
| self.sock.connect(sa) | |
| except socket.error as msg: | |
| if self.sock: | |
| self.sock.close() | |
| self.sock = None | |
| continue | |
| break | |
| if not self.sock: | |
| raise socket.error(msg) | |
| if self.connect_data: | |
| self.sock.sendall(self.connect_data[0]) | |
| self.af = self.sock.family | |
| self.file = self.sock.makefile('rb') | |
| 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 | |
| def set_extended_address(self, val): | |
| '''Use extended passive or active mode for data transfers. | |
| With a false argument, use the normal EPRT mode, | |
| With a true argument, use the PASV command.''' | |
| self.extended_address = val | |
| # Internal: "sanitize" a string for printing | |
| def sanitize(self, s): | |
| if s[:5] == 'pass ' or s[:5] == 'PASS ': | |
| i = len(s) | |
| while i > 5 and s[i-1] in '\r\n': | |
| i = i-1 | |
| 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') | |
| if self.sock is None: | |
| raise error_closed() | |
| 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 = _read_binary_line(self.file).decode(self.encoding) | |
| 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.''' | |
| msg = "getaddrinfo returns an empty list" | |
| 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 socket.error as msg: | |
| if sock: | |
| sock.close() | |
| sock = None | |
| continue | |
| break | |
| if not sock: | |
| raise socket.error(msg) | |
| sock.listen(1) | |
| port = sock.getsockname()[1] # Get proper port | |
| host = self.sock.getsockname()[0] # Get proper host | |
| if self.extended_address: | |
| self.sendeprt(host, port) | |
| else: | |
| self.sendport(host, port) | |
| if self.timeout is not _GLOBAL_DEFAULT_TIMEOUT: | |
| sock.settimeout(self.timeout) | |
| return sock | |
| def makepasv(self): | |
| if self.extended_address: | |
| host, port = parse229( | |
| self.sendcmd('EPSV'), self.sock.getpeername()) | |
| else: | |
| host, port = parse227(self.sendcmd('PASV')) | |
| 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() | |
| self.last_passive_host = host | |
| self.last_passive_port = port | |
| af, socktype, proto, canon, sa = socket.getaddrinfo( | |
| host, port, 0, socket.SOCK_STREAM)[0] | |
| conn = socket.socket(af, socktype, proto) | |
| conn.connect(sa) | |
| if self.connect_data: | |
| conn.sendall(self.connect_data[1]) | |
| if rest is not None: | |
| self.sendcmd("REST %s" % rest) | |
| time.sleep(0.01) | |
| 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) | |
| else: | |
| sock = self.makeport() | |
| 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') | |
| conn = self.transfercmd(cmd, rest) | |
| while 1: | |
| data = conn.recv(blocksize) | |
| if not data: | |
| break | |
| callback(data) | |
| conn.close() | |
| return self.voidresp() | |
| def retrlines(self, cmd, callback = None, strip_line=True): | |
| """Retrieve data in line mode. A new port is created for you. | |
| Args: | |
| cmd: A RETR, LIST, NLST, or MLSD command. | |
| callback: An optional single parameter callable that is called | |
| for each line with the trailing CRLF stripped. | |
| [default: print_line()] | |
| strip_line: A flat for allowing to return the actual line separator | |
| received over the data channel. | |
| Returns: | |
| The response code. | |
| """ | |
| if callback is None: callback = print_line | |
| self.sendcmd('TYPE A') | |
| conn = self.transfercmd(cmd) | |
| # To support testing, we always read the content in binary mode. | |
| fp = conn.makefile('rb') | |
| while 1: | |
| line = _read_binary_line(fp).decode(self.encoding) | |
| if self.debugging > 2: print('*retr*', repr(line)) | |
| if not line: | |
| # Nothing read. We should be at EOF. | |
| break | |
| if strip_line: | |
| if line[-2:] == CRLF: | |
| line = line[:-2] | |
| elif line[-1:] == '\n': | |
| line = line[:-1] | |
| callback(line) | |
| fp.close() | |
| conn.close() | |
| 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 | |
| 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') | |
| conn = self.transfercmd(cmd, rest) | |
| while 1: | |
| buf = fp.read(blocksize) | |
| if not buf: break | |
| conn.sendall(buf) | |
| if callback: callback(buf) | |
| conn.close() | |
| 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 | |
| on each line after it is sent. [default: None] | |
| Returns: | |
| The response code. | |
| """ | |
| self.voidcmd('TYPE A') | |
| conn = self.transfercmd(cmd) | |
| while 1: | |
| # To support testing, the local file is always read the local | |
| # source file binary mode. | |
| buf = _read_binary_line(fp).decode(self.encoding) | |
| if not buf: | |
| break | |
| if buf[-1] != '\n': | |
| # No new line delimiter, so no need to convert it. | |
| pass | |
| elif buf[-2:] != CRLF: | |
| # We need to convert the newline. | |
| if buf[-1] in CRLF: | |
| buf = buf[:-1] | |
| buf = buf + CRLF | |
| conn.sendall(buf.encode(self.encoding)) | |
| if callback: callback(buf) | |
| conn.close() | |
| 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 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() | |
| try: | |
| return int(s) | |
| except (OverflowError, ValueError): | |
| return int(s) | |
| def mkd(self, dirname): | |
| '''Make a directory, return its full pathname.''' | |
| resp = self.sendcmd('MKD ' + dirname) | |
| return parse257(resp) | |
| def rmd(self, dirname): | |
| '''Remove a directory.''' | |
| return self.voidcmd('RMD ' + dirname) | |
| def pwd(self): | |
| '''Return current working directory.''' | |
| resp = self.sendcmd('PWD') | |
| 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. | |
| """ | |
| if self.sock is not None: | |
| try: | |
| self.sock.shutdown(socket.SHUT_RDWR) | |
| except socket.error as error: | |
| if error.errno == errno.ENOTCONN: | |
| # Shutdown is already done as socket is closed. | |
| pass | |
| else: | |
| raise | |
| self.sock.close() | |
| if self.file is not None: | |
| self.file.close() | |
| self.file = self.sock = None | |
| class FTP_TLS(FTP): | |
| '''A FTP subclass which adds TLS support to FTP as described | |
| in RFC-4217. | |
| Connect as usual to port 21 explicitly 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.SSLv23_METHOD | |
| def __init__(self, host='', user='', passwd='', acct='', keyfile=None, | |
| certfile=None, timeout=_GLOBAL_DEFAULT_TIMEOUT, | |
| cipher_list=None, method=None, cafile=None): | |
| self.keyfile = keyfile | |
| self.certfile = certfile | |
| self.cafile = cafile | |
| self.cipher_list = cipher_list | |
| if method is None: | |
| method = self.ssl_version | |
| self.method = method | |
| self._prot_p = False | |
| self.dtp_session_reuse = True | |
| self.ssl_context = None | |
| FTP.__init__(self, host, user, passwd, acct, timeout) | |
| def init_ssl_context(self): | |
| '''Retun a SSL context for this client.''' | |
| if self.ssl_context is None: | |
| self.ssl_context = ssl.Context(self.method) | |
| if not self.cipher_list: | |
| self.cipher_list = 'ALL' + OPENSSL_SECLEVEL | |
| self.ssl_context.set_cipher_list(self.cipher_list) | |
| if self.certfile: | |
| self.ssl_context.use_certificate_file(self.certfile) | |
| if not self.keyfile: | |
| self.keyfile = self.certfile | |
| if self.keyfile: | |
| self.ssl_context.use_privatekey_file(self.keyfile) | |
| if self.cafile: | |
| def verify_server_certificate( | |
| conn, cert, errno, depth, preverify_ok): | |
| return preverify_ok | |
| self.ssl_context.set_verify( | |
| ssl.VERIFY_PEER | ssl.VERIFY_FAIL_IF_NO_PEER_CERT | | |
| ssl.VERIFY_CLIENT_ONCE, | |
| verify_server_certificate, | |
| ) | |
| self.ssl_context.load_verify_locations(self.cafile, None) | |
| self._OP_ALL = getattr(ssl, 'OP_ALL', 0x0000FFFF) | |
| self.ssl_context.set_options(self._OP_ALL) | |
| # OP_NO_TICKET is not (yet) exposed by PyOpenSSL | |
| self._OP_NO_TICKET = 0x00004000 | |
| self.ssl_context.set_options(self._OP_NO_TICKET) | |
| self.ssl_context.set_options(ssl.OP_SINGLE_DH_USE) | |
| def getline(self): | |
| """ | |
| SSL wrapper for plan FTP.getline | |
| """ | |
| return self._callSSL(FTP.getline, self) | |
| def putline(self, line): | |
| """ | |
| SSL wrapper for plan FTP.putline | |
| """ | |
| return self._callSSL(FTP.putline, self, line) | |
| def _callSSL(self, callback, *args, **kwargs): | |
| """ | |
| Try to call a method which uses the SSL layer, | |
| retrying on WantReadError. | |
| """ | |
| _tries = kwargs.pop('_tries', 0) | |
| try: | |
| return callback(*args, **kwargs) | |
| except (ssl.WantReadError, ssl.WantWriteError): # noqa:cover | |
| # This means that SSL layers still needs to read data in order | |
| # to get our data. | |
| # We wait for SSL thread to do its job and try again. | |
| # Waiting for less results in reaching the | |
| # recursion limit. | |
| if _tries > 20: | |
| # We already tried enough. | |
| raise | |
| time.sleep(0.1) | |
| kwargs['_tries'] = _tries + 1 | |
| return self._callSSL(callback, *args, **kwargs) | |
| except ssl.SysCallError as error: | |
| # Connection was closed. | |
| raise error_perm('SysCallError {}'.format(error)) | |
| def doSSLShutdown(self, socket, timeout=10): | |
| """ | |
| Clear the SSL part of a socket. | |
| """ | |
| if not isinstance(socket, ssl.Connection): | |
| return | |
| start_time = time.time() | |
| socket.set_shutdown(ssl.SENT_SHUTDOWN | ssl.RECEIVED_SHUTDOWN) | |
| while time.time() - start_time < timeout: | |
| try: | |
| # Try the handshake, just in the case in which it was | |
| # accidentally not triggered yet. | |
| socket.do_handshake() | |
| except ssl.WantReadError: | |
| pass | |
| state = socket.get_state_string() | |
| if state == b'SSL negotiation finished successfully': | |
| break | |
| if not socket.shutdown(): | |
| # TLS not yet finalized. | |
| # Wait and retry. | |
| time.sleep(0.1) | |
| socket.shutdown() | |
| def close(self): | |
| """ | |
| Close the connection without assuming anything about it. | |
| """ | |
| if self.sock is not None: | |
| try: | |
| # On FTPS self.sock is a SSL.Connection. | |
| try: | |
| self.sock.shutdown() | |
| except TypeError: | |
| # We might have downgraded the data channel using CCC. | |
| self.sock.shutdown(socket.SHUT_RDWR) | |
| self.sock.close() | |
| except socket.error as error: | |
| if error.errno == errno.ENOTCONN: | |
| # Shutdown is already done as socket is closed. | |
| pass | |
| else: | |
| raise | |
| if self.file is not None: | |
| self.file.close() | |
| self.file = self.sock = None | |
| def login(self, user='', passwd='', acct='', secure=True): | |
| if secure and not isinstance(self.sock, ssl.Connection): | |
| 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.Connection): | |
| raise ValueError("Already using TLS") | |
| if self.method == ssl.TLSv1_METHOD: | |
| resp = self.voidcmd('AUTH TLS') | |
| else: | |
| resp = self.voidcmd('AUTH SSL') | |
| self.init_ssl_context() | |
| # The non-SSL-wrapped socket. | |
| self._clean_socket = self.sock | |
| self._clean_file = self.file | |
| self.sock = ssl.Connection(self.ssl_context, self.sock) | |
| self.sock.setblocking(True) | |
| self.sock.set_connect_state() | |
| try: | |
| self.sock.do_handshake() | |
| except ssl.WantReadError: | |
| pass | |
| if six.PY2: | |
| self.file = socket._fileobject(self.sock, 'rb') | |
| else: | |
| self.file = socket.SocketIO(self.sock, 'rb') | |
| 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 | |
| def ccc(self): | |
| if not isinstance(self.sock, ssl.Connection): | |
| raise ValueError("not using TLS") | |
| resp = self.voidcmd('CCC') | |
| self.sock.set_shutdown(ssl.SENT_SHUTDOWN | ssl.RECEIVED_SHUTDOWN) | |
| done = self.sock.shutdown() | |
| assert done is True | |
| self.sock = self._clean_socket | |
| self.file = self.sock.makefile('rb') | |
| # Flush the data from the tls shutdown. | |
| self.sock.recv(100) | |
| return resp | |
| # --- Overridden FTP methods | |
| def ntransfercmd(self, cmd, rest=None): | |
| '''See `FTP.ntransfercmd`. | |
| Initiate a transfer over data channel.''' | |
| conn, size = FTP.ntransfercmd(self, cmd, rest) | |
| if self._prot_p: | |
| conn = ssl.Connection(self.ssl_context, conn) | |
| conn.set_connect_state() | |
| if self.dtp_session_reuse: | |
| conn.set_session(self.sock.get_session()) | |
| return conn, size | |
| def retrbinary(self, cmd, callback, blocksize=8192, rest=None): | |
| self.voidcmd('TYPE I') | |
| conn = self.transfercmd(cmd, rest) | |
| try: | |
| while 1: | |
| data = None | |
| try: | |
| data = self._callSSL(conn.recv, blocksize) | |
| except ssl.ZeroReturnError: | |
| # pyOpenSSL does not return 0, but rather | |
| # SSL.ZeroReturnError | |
| pass | |
| if not data: | |
| break | |
| callback(data) | |
| self.doSSLShutdown(conn) | |
| except error_perm: | |
| # There was an error processing the data connection. | |
| # Read the command response and forward the error. | |
| resp = self.getresp() | |
| raise error_perm(resp) | |
| finally: | |
| conn.close() | |
| return self.voidresp() | |
| def retrlines(self, cmd, callback=None, strip_line=True): | |
| """ | |
| Read lines over SSL. | |
| """ | |
| if callback is None: | |
| callback = print_line | |
| self.sendcmd('TYPE A') | |
| conn = self.transfercmd(cmd) | |
| # Content of unfinished line. | |
| buff = b'' | |
| try: | |
| while 1: | |
| try: | |
| data = self._callSSL(conn.recv, 8192) | |
| if not data: | |
| break | |
| except ssl.ZeroReturnError: | |
| '''When the socket is using SSL it will raise | |
| ZeroReturnError instead of returning 0.''' | |
| break | |
| data = buff + data | |
| buff = b'' | |
| lines = data.splitlines(True) | |
| last_line = lines[-1] | |
| if not last_line.endswith(b'\n'): | |
| # last line does not have a new line... so it might | |
| # be a partial line. | |
| buff = last_line | |
| lines = lines[:-1] | |
| for line in lines: | |
| if strip_line: | |
| if line[-2:] == B_CRLF: | |
| line = line[:-2] | |
| elif line[-1:] == '\n': | |
| line = line[:-1] | |
| callback(line.decode(self.encoding)) | |
| # Notify last line, if not sent already. | |
| if buff: | |
| callback(buff.decode(self.encoding)) | |
| self.doSSLShutdown(conn) | |
| except error_perm: | |
| # There was an error processing the data connection. | |
| # Read the command response and forward the error. | |
| resp = self.getresp() | |
| raise error_perm(resp) | |
| finally: | |
| conn.close() | |
| return self.voidresp() | |
| def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None): | |
| self.voidcmd('TYPE I') | |
| conn = self.transfercmd(cmd, rest) | |
| try: | |
| while 1: | |
| buf = fp.read(blocksize) | |
| if not buf: | |
| break | |
| self._callSSL(conn.sendall, buf) | |
| if callback: | |
| callback(buf) | |
| self.doSSLShutdown(conn) | |
| finally: | |
| conn.close() | |
| return self.voidresp() | |
| def storlines(self, cmd, fp, callback=None): | |
| self.voidcmd('TYPE A') | |
| conn = self.transfercmd(cmd) | |
| try: | |
| while 1: | |
| buf = _read_binary_line(fp).decode(self.encoding) | |
| if not buf: | |
| break | |
| if buf[-1] != '\n': | |
| # No new line delimiter, so no need to convert it. | |
| pass | |
| elif buf[-2:] != CRLF: | |
| if buf[-1] in CRLF: | |
| buf = buf[:-1] | |
| buf = buf + CRLF | |
| self._callSSL(conn.sendall, buf.encode(self.encoding)) | |
| if callback: | |
| callback(buf) | |
| # Wait a bit for the last chunk to be sent. | |
| # I have no idea why this is needed for the ASCII tests. | |
| # as for SSL it all should be bytes. | |
| # This failure was not observed for binary tests executed via | |
| # storbinary, but it might be because for binary all data is | |
| # written in one go. | |
| time.sleep(0.1) | |
| self.doSSLShutdown(conn) | |
| finally: | |
| conn.close() | |
| return self.voidresp() | |
| all_errors = (Error, IOError, EOFError, ssl.Error) | |
| class FTP_TLSI(FTP_TLS): | |
| '''A FTP_TLS subclass which add implicit FTPS support.''' | |
| def __init__(self, *args, **kwargs): | |
| FTP_TLS.__init__(self, *args, **kwargs) | |
| self.init_ssl_context() | |
| def connect(self, host='', port=0, timeout=-999): | |
| '''Connect to host. Arguments are: | |
| - host: hostname to connect to (string, default previous host) | |
| - port: port to connect to (integer, default previous port) | |
| ''' | |
| if host != '': | |
| self.host = host | |
| if port > 0: | |
| self.port = port | |
| if timeout != -999: | |
| self.timeout = timeout | |
| msg = "getaddrinfo returns an empty list" | |
| for res in socket.getaddrinfo( | |
| self.host, self.port, 0, socket.SOCK_STREAM): | |
| af, socktype, proto, canonname, sa = res | |
| try: | |
| self._clean_socket = socket.socket(af, socktype) | |
| self._clean_socket.setblocking(True) | |
| self._clean_socket.connect(sa) | |
| self.sock = ssl.Connection( | |
| self.ssl_context, self._clean_socket) | |
| self.sock.setblocking(True) | |
| self.sock.set_connect_state() | |
| except socket.error as msg: | |
| if self.sock: | |
| self.sock.close() | |
| self.sock = None | |
| continue | |
| break | |
| if not self.sock: | |
| raise socket.error(msg) | |
| self.af = self.sock.family | |
| if self.connect_data: | |
| self._clean_socket.sendall(self.connect_data[0]) | |
| try: | |
| self.sock.do_handshake() | |
| except ssl.WantReadError: | |
| pass | |
| if six.PY2: | |
| self.file = socket._fileobject(self.sock, 'rb') | |
| else: | |
| self.file = socket.SocketIO(self.sock, 'rb') | |
| self.welcome = self.getresp() | |
| return self.welcome | |
| def login(self, user='', passwd='', acct='', secure=True): | |
| return FTP.login(self, user, passwd, acct) | |
| def auth(self): | |
| """ | |
| Called to initiate explicit FTPS. | |
| """ | |
| raise AssertionError('FTPSI has no AUTH command.') | |
| _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("150 .* \((\d+) bytes\)", re.IGNORECASE) | |
| m = _150_re.match(resp) | |
| if not m: | |
| return None | |
| s = m.group(1) | |
| try: | |
| return int(s) | |
| except (OverflowError, ValueError): | |
| return int(s) | |
| _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+)') | |
| 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 a 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() | |
| class Netrc: | |
| """Class to parse & provide access to 'netrc' format files. | |
| See the netrc(4) man page for information on the file format. | |
| WARNING: This class is obsolete -- use module netrc instead. | |
| """ | |
| __defuser = None | |
| __defpasswd = None | |
| __defacct = None | |
| def __init__(self, filename=None): | |
| if filename is None: | |
| if "HOME" in os.environ: | |
| filename = os.path.join(os.environ["HOME"], | |
| ".netrc") | |
| else: | |
| raise IOError( | |
| "specify file to load or set $HOME") | |
| self.__hosts = {} | |
| self.__macros = {} | |
| fp = open(filename, "r") | |
| in_macro = 0 | |
| macro_name = None | |
| macro_lines = [] | |
| while 1: | |
| line = _read_line(fp) | |
| if not line: break | |
| if in_macro and line.strip(): | |
| macro_lines.append(line) | |
| continue | |
| elif in_macro: | |
| self.__macros[macro_name] = tuple(macro_lines) | |
| in_macro = 0 | |
| words = line.split() | |
| host = user = passwd = acct = None | |
| default = 0 | |
| i = 0 | |
| while i < len(words): | |
| w1 = words[i] | |
| if i+1 < len(words): | |
| w2 = words[i + 1] | |
| else: | |
| w2 = None | |
| if w1 == 'default': | |
| default = 1 | |
| elif w1 == 'machine' and w2: | |
| host = w2.lower() | |
| i = i + 1 | |
| elif w1 == 'login' and w2: | |
| user = w2 | |
| i = i + 1 | |
| elif w1 == 'password' and w2: | |
| passwd = w2 | |
| i = i + 1 | |
| elif w1 == 'account' and w2: | |
| acct = w2 | |
| i = i + 1 | |
| elif w1 == 'macdef' and w2: | |
| macro_name = w2 | |
| macro_lines = [] | |
| in_macro = 1 | |
| break | |
| i = i + 1 | |
| if default: | |
| self.__defuser = user or self.__defuser | |
| self.__defpasswd = passwd or self.__defpasswd | |
| self.__defacct = acct or self.__defacct | |
| if host: | |
| if host in self.__hosts: | |
| ouser, opasswd, oacct = \ | |
| self.__hosts[host] | |
| user = user or ouser | |
| passwd = passwd or opasswd | |
| acct = acct or oacct | |
| self.__hosts[host] = user, passwd, acct | |
| fp.close() | |
| def get_hosts(self): | |
| """Return a list of hosts mentioned in the .netrc file.""" | |
| return list(self.__hosts.keys()) | |
| def get_account(self, host): | |
| """Returns login information for the named host. | |
| The return value is a triple containing userid, | |
| password, and the accounting field. | |
| """ | |
| host = host.lower() | |
| user = passwd = acct = None | |
| if host in self.__hosts: | |
| user, passwd, acct = self.__hosts[host] | |
| user = user or self.__defuser | |
| passwd = passwd or self.__defpasswd | |
| acct = acct or self.__defacct | |
| return user, passwd, acct | |
| def get_macros(self): | |
| """Return a list of all defined macro names.""" | |
| return list(self.__macros.keys()) | |
| def get_macro(self, macro): | |
| """Return a sequence of lines which define a named macro.""" | |
| return self.__macros[macro] | |
| 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) | |
| 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: | |
| netrc = Netrc(rcfile) | |
| except IOError: | |
| if rcfile is not None: | |
| sys.stderr.write("Could not open account file" | |
| " -- using anonymous login.") | |
| else: | |
| try: | |
| userid, passwd, acct = netrc.get_account(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:] | |
| 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() |
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