EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.2 / Demo / sockets / ftp.py

# A simple FTP client.\r
#\r
# The information to write this program was gathered from RFC 959,\r
# but this is not a complete implementation!  Yet it shows how a simple\r
# FTP client can be built, and you are welcome to extend it to suit\r
# it to your needs...\r
#\r
# How it works (assuming you've read the RFC):\r
#\r
# User commands are passed uninterpreted to the server.  However, the\r
# user never needs to send a PORT command.  Rather, the client opens a\r
# port right away and sends the appropriate PORT command to the server.\r
# When a response code 150 is received, this port is used to receive\r
# the data (which is written to stdout in this version), and when the\r
# data is exhausted, a new port is opened and a corresponding PORT\r
# command sent.  In order to avoid errors when reusing ports quickly\r
# (and because there is no s.getsockname() method in Python yet) we\r
# cycle through a number of ports in the 50000 range.\r
\r
\r
import sys, posix, string\r
from socket import *\r
\r
\r
BUFSIZE = 1024\r
\r
# Default port numbers used by the FTP protocol.\r
#\r
FTP_PORT = 21\r
FTP_DATA_PORT = FTP_PORT - 1\r
\r
# Change the data port to something not needing root permissions.\r
#\r
FTP_DATA_PORT = FTP_DATA_PORT + 50000\r
\r
\r
# Main program (called at the end of this file).\r
#\r
def main():\r
    hostname = sys.argv[1]\r
    control(hostname)\r
\r
\r
# Control process (user interface and user protocol interpreter).\r
#\r
def control(hostname):\r
    #\r
    # Create control connection\r
    #\r
    s = socket(AF_INET, SOCK_STREAM)\r
    s.connect((hostname, FTP_PORT))\r
    f = s.makefile('r') # Reading the replies is easier from a file...\r
    #\r
    # Control loop\r
    #\r
    r = None\r
    while 1:\r
        code = getreply(f)\r
        if code in ('221', 'EOF'): break\r
        if code == '150':\r
            getdata(r)\r
            code = getreply(f)\r
            r = None\r
        if not r:\r
            r = newdataport(s, f)\r
        cmd = getcommand()\r
        if not cmd: break\r
        s.send(cmd + '\r\n')\r
\r
\r
# Create a new data port and send a PORT command to the server for it.\r
# (Cycle through a number of ports to avoid problems with reusing\r
# a port within a short time.)\r
#\r
nextport = 0\r
#\r
def newdataport(s, f):\r
    global nextport\r
    port = nextport + FTP_DATA_PORT\r
    nextport = (nextport+1) % 16\r
    r = socket(AF_INET, SOCK_STREAM)\r
    r.bind((gethostbyname(gethostname()), port))\r
    r.listen(1)\r
    sendportcmd(s, f, port)\r
    return r\r
\r
\r
# Send an appropriate port command.\r
#\r
def sendportcmd(s, f, port):\r
    hostname = gethostname()\r
    hostaddr = gethostbyname(hostname)\r
    hbytes = string.splitfields(hostaddr, '.')\r
    pbytes = [repr(port//256), repr(port%256)]\r
    bytes = hbytes + pbytes\r
    cmd = 'PORT ' + string.joinfields(bytes, ',')\r
    s.send(cmd + '\r\n')\r
    code = getreply(f)\r
\r
\r
# Process an ftp reply and return the 3-digit reply code (as a string).\r
# The reply should be a line of text starting with a 3-digit number.\r
# If the 4th char is '-', it is a multi-line reply and is\r
# terminate by a line starting with the same 3-digit number.\r
# Any text while receiving the reply is echoed to the file.\r
#\r
def getreply(f):\r
    line = f.readline()\r
    if not line: return 'EOF'\r
    print line,\r
    code = line[:3]\r
    if line[3:4] == '-':\r
        while 1:\r
            line = f.readline()\r
            if not line: break # Really an error\r
            print line,\r
            if line[:3] == code and line[3:4] != '-': break\r
    return code\r
\r
\r
# Get the data from the data connection.\r
#\r
def getdata(r):\r
    print '(accepting data connection)'\r
    conn, host = r.accept()\r
    print '(data connection accepted)'\r
    while 1:\r
        data = conn.recv(BUFSIZE)\r
        if not data: break\r
        sys.stdout.write(data)\r
    print '(end of data connection)'\r
\r
# Get a command from the user.\r
#\r
def getcommand():\r
    try:\r
        while 1:\r
            line = raw_input('ftp.py> ')\r
            if line: return line\r
    except EOFError:\r
        return ''\r
\r
\r
# Call the main program.\r
#\r
main()\r