On Mon, 31 Mar 2014 20:21:17 +0100 Stuart Henderson <st...@openbsd.org> wrote:
> On 2014/03/31 20:33, Christopher Zimmermann wrote: > > But our netcat won't ever terminate when used for sending an udp > > datagram: > > > > $ echo 'Hello, World!' |nc -Nu 8.8.8.8 53 > > this seems to work though ... > > $ echo 'Hello, World!' | nc -N -w0 -u 10.0.0.1 53 I tried that, too. It's not reliable due to a race between stdin and 0ms timeout: dd if=/dev/zero bs=1K count=1K |md5 |./nc -u 8.8.8.8 53 >&- if it still works, crank the count further up. I know I can use -w1 instead (that's what I currently do). But that's just a workaround, not a fix. Also it is vulnerable by forged replies. Christopher -- http://gmerlin.de OpenPGP: http://gmerlin.de/christopher.pub F190 D013 8F01 AA53 E080 3F3C F17F B0A1 D44E 4FEE
