FM / sockets

/usr/lib64/python2.7/Demo/sockets

Name	Size	Mode	Actions
broadcast.py	283	0644	edit dl rm
broadcast.pyc	547	0644	edit dl rm
broadcast.pyo	547	0644	edit dl rm
echosvr.py	738	0755	edit dl rm
echosvr.pyc	827	0644	edit dl rm
echosvr.pyo	827	0644	edit dl rm
finger.py	1259	0755	edit dl rm
finger.pyc	1162	0644	edit dl rm
finger.pyo	1162	0644	edit dl rm
ftp.py	3928	0644	edit dl rm
ftp.pyc	2954	0644	edit dl rm
ftp.pyo	2954	0644	edit dl rm
gopher.py	9783	0755	edit dl rm
gopher.pyc	10323	0644	edit dl rm
gopher.pyo	10323	0644	edit dl rm
mcast.py	2214	0755	edit dl rm
mcast.pyc	2169	0644	edit dl rm
mcast.pyo	2169	0644	edit dl rm
radio.py	287	0644	edit dl rm
radio.pyc	471	0644	edit dl rm
radio.pyo	471	0644	edit dl rm
README	628	0644	edit dl rm
rpython.py	713	0755	edit dl rm
rpython.pyc	982	0644	edit dl rm
rpython.pyo	982	0644	edit dl rm
rpythond.py	1213	0755	edit dl rm
rpythond.pyc	1335	0644	edit dl rm
rpythond.pyo	1335	0644	edit dl rm
telnet.py	3009	0755	edit dl rm
telnet.pyc	2149	0644	edit dl rm
telnet.pyo	2149	0644	edit dl rm
throughput.py	2084	0755	edit dl rm
throughput.pyc	2473	0644	edit dl rm
throughput.pyo	2473	0644	edit dl rm
udpecho.py	1467	0755	edit dl rm
udpecho.pyc	2027	0644	edit dl rm
udpecho.pyo	2027	0644	edit dl rm
unicast.py	230	0644	edit dl rm
unicast.pyc	456	0644	edit dl rm
unicast.pyo	456	0644	edit dl rm
unixclient.py	232	0644	edit dl rm
unixclient.pyc	424	0644	edit dl rm
unixclient.pyo	424	0644	edit dl rm
unixserver.py	414	0644	edit dl rm
unixserver.pyc	593	0644	edit dl rm
unixserver.pyo	593	0644	edit dl rm

Edit: /usr/lib64/python2.7/Demo/sockets/ftp.py (3928B)

# 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()

cmd: