nc captures 1024 bytes

[Weiguang Shi]

Hi,

My system is FreeBSD 6.2. I sent a UDP datagram of 1464 bytes to port 
1234 where nc was waiting
    % nc -n -u -l 1234 >tt

Afterwards, the size of tt, however, was only 1024  bytes.

I noticed this piece of code in nc

341                         if (uflag) {
342                                 int rv, plen;
343                                 char buf[8192];
344                                 struct sockaddr_storage z;
345 
346                                 len = sizeof(z);
347                                 plen = jflag ? 8192 : 1024;
348                                 rv = recvfrom(s, buf, plen, MSG_PEEK,
349                                     (struct sockaddr *)&z, &len);
350                                 if (rv < 0)
351                                         err(1, "recvfrom");

Why 1024 instead of something like 1500-20-8=1472?

Thanks.
Wei




       
____________________________________________________________________________________
Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games.
http://sims.yahoo.com/