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✏️ ftp.py

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# A simple FTP client.
#
# The information to write this program was gathered from RFC 959,
# but this is not a complete implementation!  Yet it shows how a simple
# FTP client can be built, and you are welcome to extend it to suit
# it to your needs...
#
# How it works (assuming you've read the RFC):
#
# User commands are passed uninterpreted to the server.  However, the
# user never needs to send a PORT command.  Rather, the client opens a
# port right away and sends the appropriate PORT command to the server.
# When a response code 150 is received, this port is used to receive
# the data (which is written to stdout in this version), and when the
# data is exhausted, a new port is opened and a corresponding PORT
# command sent.  In order to avoid errors when reusing ports quickly
# (and because there is no s.getsockname() method in Python yet) we
# cycle through a number of ports in the 50000 range.

import sys, posix, string
from socket import *

BUFSIZE = 1024

# Default port numbers used by the FTP protocol.
#
FTP_PORT = 21
FTP_DATA_PORT = FTP_PORT - 1

# Change the data port to something not needing root permissions.
#
FTP_DATA_PORT = FTP_DATA_PORT + 50000

# Main program (called at the end of this file).
#
def main():
    hostname = sys.argv[1]
    control(hostname)

# Control process (user interface and user protocol interpreter).
#
def control(hostname):
    #
    # Create control connection
    #
    s = socket(AF_INET, SOCK_STREAM)
    s.connect((hostname, FTP_PORT))
    f = s.makefile('r') # Reading the replies is easier from a file...
    #
    # Control loop
    #
    r = None
    while 1:
        code = getreply(f)
        if code in ('221', 'EOF'): break
        if code == '150':
            getdata(r)
            code = getreply(f)
            r = None
        if not r:
            r = newdataport(s, f)
        cmd = getcommand()
        if not cmd: break
        s.send(cmd + '\r\n')

# Create a new data port and send a PORT command to the server for it.
# (Cycle through a number of ports to avoid problems with reusing
# a port within a short time.)
#
nextport = 0
#
def newdataport(s, f):
    global nextport
    port = nextport + FTP_DATA_PORT
    nextport = (nextport+1) % 16
    r = socket(AF_INET, SOCK_STREAM)
    r.bind((gethostbyname(gethostname()), port))
    r.listen(1)
    sendportcmd(s, f, port)
    return r

# Send an appropriate port command.
#
def sendportcmd(s, f, port):
    hostname = gethostname()
    hostaddr = gethostbyname(hostname)
    hbytes = string.splitfields(hostaddr, '.')
    pbytes = [repr(port//256), repr(port%256)]
    bytes = hbytes + pbytes
    cmd = 'PORT ' + string.joinfields(bytes, ',')
    s.send(cmd + '\r\n')
    code = getreply(f)

# Process an ftp reply and return the 3-digit reply code (as a string).
# The reply should be a line of text starting with a 3-digit number.
# If the 4th char is '-', it is a multi-line reply and is
# terminate by a line starting with the same 3-digit number.
# Any text while receiving the reply is echoed to the file.
#
def getreply(f):
    line = f.readline()
    if not line: return 'EOF'
    print line,
    code = line[:3]
    if line[3:4] == '-':
        while 1:
            line = f.readline()
            if not line: break # Really an error
            print line,
            if line[:3] == code and line[3:4] != '-': break
    return code

# Get the data from the data connection.
#
def getdata(r):
    print '(accepting data connection)'
    conn, host = r.accept()
    print '(data connection accepted)'
    while 1:
        data = conn.recv(BUFSIZE)
        if not data: break
        sys.stdout.write(data)
    print '(end of data connection)'

# Get a command from the user.
#
def getcommand():
    try:
        while 1:
            line = raw_input('ftp.py> ')
            if line: return line
    except EOFError:
        return ''

# Call the main program.
#
main()

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✏️ ftp.py