Simple file transfer with python

ftrans is simple file transfer system for using promptly. Every linux computer is intalled. It makes easy to use this file transfer script.

python -m compileall .py .py python -m ftrans ftrans.py

#----------------------------------------------
# ftrans.py
#----------------------------------------------
import sys
import socket                   # Import socket module


#----------------------------------------------
# Global variables
#----------------------------------------------
global gip, gport, gfile

gip = '127.0.0.1'
gport = 60000
gfile = "aa.tar"

#----------------------------------------------
# Functions
#----------------------------------------------
def usage():
    print("Usage: " + sys.argv[0] + " s <port>")
    print("       " + sys.argv[0] + " c <ip> <port> <filename>")

def run_server():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)             # Create a socket object
    host = '0.0.0.0'                # Any cf.socket.gethostname()
    s.bind((host, gport))           # Bind to the port
    s.listen(5)                     # Now wait for client connection.

    print('Server listening... (Port:' + str(gport) + ")")

    while True:
        conn, addr = s.accept()     # Establish connection with client.
        print('Connection from : ', addr)
        data = conn.recv(1024)
        print('Server received : ', repr(data))

        #gfile = 'aa.tar'
        gfile = str(data)
        file = open(gfile,'rb')
        buf = file.read(1024)
        while (buf):
           conn.send(buf)
          #print('Sent ',len(buf))
           buf = file.read(1024)
        file.close()

        print('Sending Completed')
        conn.send('Thank you for connecting')
        conn.close()

def run_client():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)             # Create a socket object
    print("connecting to " + gip)
    s.connect((gip, gport))
    s.send(gfile)

    cnt = 0
    with open(gfile, 'wb') as file:
        print 'file opened'
        while True:
          #print('receiving data...')
           data = s.recv(1024)
          #print('data=', cnt, len(data))
           if not data:
              break
           # write data to a file
           file.write(data)

    file.close()
    print('Successfully get the file')
    s.close()
    print('connection closed')

def send_udp(ip, port, file):
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP socket

    fp = open(file,'rb')
    buf = fp.read(1024)
    buflen = 0
    print('Start...{0}:{1} {2}'.format(ip, port, file))

    while (buf):
        buflen = buflen + len(buf)
        sock.sendto(buf, (ip, port))
        buf = fp.read(1024)
    fp.close()
    sock.close()
    print('Send completed : ' + str(buflen))


#----------------------------------------------
# Check & Run
#----------------------------------------------
argc = len(sys.argv)
print("Starting...(Argc:" + str(argc) + ")")

if argc > 1:
    if sys.argv[1][0] == 's':
        print("server:" + sys.argv[1])
        if argc > 2:
            gport = int(sys.argv[2])
            run_server()
        else:
            usage()
            sys.exit()
    elif sys.argv[1][0] == 'c':
        print("client:" + sys.argv[1])
        if argc > 3:
            gip = sys.argv[2]
            gport = int(sys.argv[3])
            if argc > 4:
                gfile = sys.argv[4]
            run_client()
        else:
            usage()
            sys.exit()
    else:
        print("send udp:" + sys.argv[1])
        if argc > 3:
            gip = sys.argv[2]
            gport = int(sys.argv[3])
            if argc > 4:
                gfile = sys.argv[4]
            send_udp(gip, gport, gfile)
        else:
            usage()
            sys.exit()
else:
    usage()
    sys.exit()