28 Mar
2020
28 Mar
'20
5:14 p.m.
On Sat, Mar 28, 2020 at 01:12:35PM +0200, Peter Pentchev wrote:
On Thu, Mar 26, 2020 at 01:38:17PM +1100, Dave
Horsfall wrote:
...but, of course, this is still not what Derek was talking about
earlier - there is no separation of the file descriptors connected to
the socket: closing the stdout one would not result in a FIN being sent
along the line.
G'luck,
Peter
--
Peter Pentchev roam(a){ringlet.net,debian.org,FreeBSD.org} pp(a)storpool.com
PGP key: http://people.FreeBSD.org/~roam/roam.key.asc
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On Wed, 25 Mar 2020, Grant Taylor via TUHS
wrote:
This can't really be done with netcat, but it's quite easy to do with
socat; here's an example with a trivial program that reads lines from
its standard input and writes a single line to its standard output:
[roam@straylight ~]$ socat -v tcp4:nimbus.fccf.net:25 exec:./heysmtp.py
· netcat's STDOUT to grep's STDIN
· grep's STDOUT to netcat's STDIN
Are you trying to set up a loop of processes or something? I'm not sure if
that is even possible, although you can't rule out creative uses of dup2()
etc... 2020/03/28 13:09:04.005497 length=48 from=0
to=47
220 nimbus.fccf.net ESMTP Postfix (Debian/GNU)\r
< 2020/03/28 13:09:04.018931 length=6 from=0 to=5
QUIT\r
2020/03/28 13:09:04.035387 length=15 from=48
to=62
221 2.0.0 Bye\r
[roam@straylight ~]$
All the output was actually from socat because of the "-v" option
specified.