Python implementation Netcat

import sysimport socketimport getoptimport threadingimport subprocesslisten =  Falsecommand = Falseupload = Falseexecute =  "target = " "Upload_ destination =  "" Port = 0def usage ():    print  "BHP Net  tool "    print    print " usage: bhpnet.py -t  target_host -p port "    print "-l --listen -listen on  [host]:[port] for incoming connections "    print "-e -- Execute=file_to_run -execute the given file uponreceiving a connection "     print  "-c --command - initialize a command shell"     print  "-u --upload=destination - upon receiveing  Connection upload a fiLe and write to [destination] "    print    print     print  "Examples:"     print  "bhpnet.py -t  192.168.0.1 -p 5555 -l -c "    print " bhpnet.py -t  192.168.0.1 -p 5555 -l -u=c:\\target.exe "    print " echo  " Abcdefghi '  | ./bhpnet.py -t 192.168.11.12 -p 135 '      Sys.exit (0) Def main ():     global listen    global port     global execute    global command     Global upload_destination    global target    if not  len (sys.argv[1:]):         usage ()     try:       &nBsp; opts,args = getopt.getopt (sys.argv[1:], "HLE:T:P:CU:", ["Help", "Listen", "execute", "Port", " Command "," Upload "])     except getopt. GETOPTERROR&NBSP;AS&NBSP;ERR:&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;PRINT&NBSP;STR (ERR)          usage ()     for o,a in opts:         if o in  ("-H", "--help"):             usage ()         elif o  in  ("-L", "--listen"):             listen  = True        elif o in  ("-E", "--execute"):             execute = a         elif o in  ("-C", "--commaNdshell "):             command = true         elif o in  ("-U", "--upload"):             upload_destination = a         elif o in  ("-T", "--target"):             target = a        elif o  in  ("-P", "--port"):             port  = int (a)         else:             assert false, "Unhanded option"     if  Not listen and len (target)  and port > 0:         buffer&nbSp;= sys.stdin.read ()         client_sender (buffer)      if listen:        server_loop () Main () Def client_ Sender (Buffer):     client = socket.socket (Socket.af_inet,socket. Sock_stream)     try:        client.connect ((target , port))         if len (buffer):             client.send (buffer)          While true:            recv_len = 1             response =  ""              while recv_len:            &nBSP;&NBSP;&NBSP;&NBSP;&NBSP;DATA&NBSP;=&NBSP;CLIENT.RECV (4096)                  recv_len = len (data)                  response += data                 if recv_len <  4096:                     break            print  Response,            buffer = raw_input ( "")             buffer +=  "\ n"              client.send (buffer)      except:        print  "[*] exception! exiting.]         client.close () Def server_loop ():     Global target    if not len (target):         target =  "0.0.0.0"     server = socket.socket (socket.af_ Inet,socket. Sock_stream)     server.bind ((Target,port))     server.listen (5)      while true:        client_socket,addr =  server.accept ()         client_thread = threading. Thread (target=client_handler,args= (Client_socket,))         client_ Thread.Start () Def run_command (command):     command = command.rstrip ()      try:     &Nbsp;  output = subprocess.check_output (command,stderr=subprocess. Stdout,shell=true)     except:        output =   "failed to execute command.\r\n"     return outputdef client _handler (client_soket):     global upload    global execute     global command    if len (upload_destination):         file_buffer =  ""          while true:            data = &NBSP;CLIENT_SOKET.RECV (4096)             if  not data:                 break            else:                 file_buffer += data        try:             file_description = open ( Upload_destination, "WB")             file_ Description.write (File_buffer)             file_ Description.close ()             client_soket.send (" successfully saved file to %s\r\n " % upload_destination)          except:            client_ Soket.send ("failed to save file to %s\r\n"  % upload_destination)      if len (Execute):        output = run_command (Execute)          client_soket.send (output)     if command:         while True:             client_soket ("<BHP:#>")              cmd_buffer =  ""              while  "\ n"  not in cmd_buffer:           &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;CMD_BUFFER&NBSP;+=&NBSP;CLIENT_SOKET.RECV (1024x768)              response = run_command (Cmd_buffer)              client_soket.send (response)

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Python implementation Netcat