Date: Mon, 27 Aug 2007 16:37:40 -0700 (PDT) From: Weiguang Shi <wgshizz@yahoo.com> To: Weiguang Shi <wgshizz@yahoo.com>, freebsd-net@freebsd.org Subject: Re: nc captures 1024 bytes Message-ID: <43862.94241.qm@web43132.mail.sp1.yahoo.com>
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To get the larger packets, I have to fix another hard-coded "1024" =0A=0A63=
0 readwrite(int nfd)=0A631 {=0A632 struct pollfd pfd[2];=0A633 =
unsigned char buf[8192];=0A634 int n, wfd =3D fileno(stdin);=0A=
635 int lfd =3D fileno(stdout);=0A636 int plen;=0A637 =0A63=
8 plen =3D jflag ? 8192 : 1024;=0A639 =0A=0A----- Original Message =
----=0AFrom: Weiguang Shi <wgshizz@yahoo.com>=0ATo: freebsd-net@freebsd.org=
=0ASent: Monday, August 27, 2007 4:05:26 PM=0ASubject: nc captures 1024 byt=
es=0A=0AHi,=0A=0AMy system is FreeBSD 6.2. I sent a UDP datagram of 1464 by=
tes to port =0A1234 where nc was waiting=0A % nc -n -u -l 1234 >tt=0A=0A=
Afterwards, the size of tt, however, was only 1024 bytes.=0A=0AI noticed t=
his piece of code in nc=0A=0A341 if (uflag) {=0A342=
int rv, plen;=0A343 =
char buf[8192];=0A344 struct sock=
addr_storage z;=0A345 =0A346 len =3D sizeof=
(z);=0A347 plen =3D jflag ? 8192 : 1024;=0A=
348 rv =3D recvfrom(s, buf, plen, MSG_PEEK,=
=0A349 (struct sockaddr *)&z, &len);=0A=
350 if (rv < 0)=0A351 =
err(1, "recvfrom");=0A=0AWhy 1024 instead of something l=
ike 1500-20-8=3D1472?=0A=0AThanks.=0AWei=0A=0A=0A=0A=0A =0A__________=
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