Question

I’m trying to write a secure transfer file program using Python and AES and i’ve got a problem i don’t totally understand. I send my file by parsing it with 1024 bytes chunks and sending them over but the server side who receive the data crashes ( I use AES CBC therefore my data length must be a multiple of 16 bytes ) and the error i get says that it is not.

I tried to print the length of the data sent by the client on the client side and the length of the data received on the server and it shows that the client is sending exactly 1024 bytes each time like it’s supposed to, but the server side shows that at some point in time, a received packet is not and so less than 1024 bytes ( for example 743 bytes ).

I tried to put a time.sleep(0.5) between each socket send on the client side and it seems to work. Is it possible that it is some kind of socket buffer failure on the server side ? That too much data is being send too fast by the client and that it breaks somehow the socket buffer on the server side so the data is corrupted or vanish and the recv(1024) only receive a broken chunk? That’s the only thing i could think of, but this may also be completely false, if anyone has an idea of why this is not working properly it would be great 😉

Following my idea i tried :

    self.s.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, 32768000)
    print socket.SO_RCVBUF

I tried to put a 32mbytes buffer on the server side but On Windows XP it shows 4098 on the print and on linux it shows only 8. I don’t know how i must interpret this, the only thing i know is that it seems that it doesn’t have a 32mbytes buffer so the code doesn’t work.

Well it’s been a really long post, i hope some of you had the courage to read it all to here ! i’m totally lost there so if anyone has any idea about this please share it 😀

Thanks to Faisal my code is here :

Server Side: ( count is my filesize/1024 )

while 1:
    txt=self.s.recv(1024)
    if txt == " ":
        break       
    txt = self.cipher.decrypt(txt)
    if countbis == count:
        txt = txt.rstrip()
    tfile.write(txt)
    countbis+=1

Client side :

while 1:
    txt= tfile.read(1024)
    if not txt:
        self.s.send(" ")
        break
    txt += ' ' * (-len(txt) % 16)
    txt = self.cipher.encrypt(txt)
    self.s.send(txt)

Thanks in advance,

Nolhian

Answer 1

Welcome to network programming! You’ve just fallen into the same mistaken assumption that everyone makes the first time through in assuming that client sends & server recives should be symmetric. Unfortunately, this is not the case. The OS allows reception to occur in arbitrarily sized chunks. It’s fairly easy to work around though, just buffer your data until the amount you’ve read in equals the amount you wish to receive. Something along the lines of this will do the trick:

buff=''
while len(buff) < 1024:
    buff += s.recv( 1024 - len(buff) )