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Full Discussion: Continuous nc data acquisition fails ocassionally
Top Forums Shell Programming and Scripting Continuous nc data acquisition fails ocassionally Post 303019401 by Corona688 on Thursday 28th of June 2018 03:17:19 PM
Old 06-28-2018
GOT IT! If you want to send to nc more than once, you always have to do so from the same source port and IP. Otherwise nc will think you're a different sender and ignore it. And the source port is randomly chosen, unless you give the sender one with -p...

I have 192.168.0.126:19999 as the receiver here, and 192.168.0.150:20000 as the sender.

Receiving:

Code:
$ nc -u -l -p 20000 192.168.0.150 19999
asdf
asdf
...

Sending:

Code:
$ echo asdf | nc -p 19999 -u -w 1 192.168.0.126 20000
$ echo asdf | nc -p 19999 -u -w 1 192.168.0.126 20000
$

Note that the sender is not quitting at end-of-line, it's quitting at end-of-file, so should still be able to handle a long, slow stream.
Last edited by Corona688; 06-28-2018 at 06:09 PM..
These 2 Users Gave Thanks to Corona688 For This Post:
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LEARN ABOUT DEBIAN

lire::firewall::ipfilterdlfconverter

IpfilterDlfConverter(3pm)				  LogReport's Lire Documentation				 IpfilterDlfConverter(3pm)

NAME

       Lire::Firewall::IpfilterDlfConverter - convert ipf (ipmon) logs to firewall DLF

DESCRIPTION

       Lire::Firewall::IpfilterDlfConverter converts Ipfilter logs into firewall DLF format.  Input for this converter is the standard ipf syslog
       log file as produced by ipmon. IP Filter is shipped with FreeBSD, OpenBSD (up to 2.9) and some other OS's.

EXAMPLE

       A ipfilter logfile which looks like

	Oct 30 07:42:29 rolle ipmon[16747]: 07:42:28.585962	ie0 @0:9
	 b 192.168.48.1,45085 -> 192.168.48.2,22 PR tcp len 20 64 -S OUT
	Oct 30 07:40:24 rolle ipmon[16747]: 07:40:23.631307	ep1 @0:6
	 b 192.168.26.5,113 -> 192.168.26.1,3717 PR tcp len 20 40 -AR OUT
	Oct 30 07:42:29 rolle ipmon[16747]: 07:42:28.585962	ie0 @0:9
	 b 192.168.48.1,45085 -> 192.168.48.2,22 PR tcp len 20 64 -S OUT
	Oct 30 07:44:11 rolle ipmon[16747]: 07:44:10.605416 2x	   ep1 @0:15
	 b 192.168.26.1,138 -> 192.168.26.255,138 PR udp len 20 257  IN
	Oct 30 07:44:34 rolle ipmon[16747]: 07:44:33.891869	ie0 @0:10
	 b 192.168.48.1,23406 -> 192.168.48.2,22 PR tcp len 20 64 -S OUT
	Oct 30 07:49:13 rolle ipmon[16747]: 07:49:12.554420	ep1 @0:15
	 b 210.132.100.117 -> 192.168.26.5 PR icmp len 20 56 icmp 3/3 for
	 192.168.26.5,61915 - 210.132.100.117,53 PR udp len 20 23040 IN
	Oct 30 07:50:23 rolle ipmon[16747]: 07:50:22.908107	ep1 @0:15
	 b 210.132.100.117 -> 192.168.26.5 PR icmp len 20 56 icmp 3/3 for
	 192.168.26.5,4480 - 210.132.100.117,53 PR udp len 20 19712 IN
	Oct 30 07:56:11 rolle ipmon[16747]: 07:56:11.113029 2x	   ep1 @0:15
	 b 192.168.26.1,138 -> 192.168.26.255,138 PR udp len 20 257  IN

       (that's: .... 'PR' protocol 'len' length_of_ip_headers_saved packetlength direction) will get converted to something like

	994398737 denied igmp 100.187.115.1 - ep1 LIRE_NOTAVAIL 
	 224.0.0.2 - 56
	994398861 denied igmp 100.187.115.1 - ep1 LIRE_NOTAVAIL 
	 224.0.0.1 - 56
	994398862 denied igmp 100.187.115.1 - ep1 LIRE_NOTAVAIL 
	 224.0.0.2 - 56
	994406849 denied udp 192.168.26.4 137 ie0 LIRE_NOTAVAIL 
	 192.168.26.255 137 116
	994406850 denied udp 192.168.26.4 137 ie0 LIRE_NOTAVAIL 
	 192.168.26.255 137 116
	994406866 denied udp 192.168.26.4 137 ie0 LIRE_NOTAVAIL 
	 192.168.26.255 137 98

SEE ALSO

       ipl(4) for description of log structure.

       The ipmon.c source (e.g. on

	http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/ 
	 src/usr.sbin/ipmon/Attic/ipmon.c?rev=1.27& 
	 content-type=text/plain&hideattic=0

       ) for the specification of the log syntax.

       The IP Filter webpage on http://coombs.anu.edu.au/~avalon/ip-filter.html

AUTHOR

       Joost van Baal <joostvb@logreport.org>, Wessel Dankers <wsl@logreport.org>

VERSION

       $Id: IpfilterDlfConverter.pm,v 1.7 2009/03/15 08:10:55 vanbaal Exp $

COPYRIGHT

       Copyright (C) 2001-2003 Stichting LogReport Foundation LogReport@LogReport.org

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with
       http://www.gnu.org/copyleft/gpl.html.

Lire 2.1.1							    2009-03-15						 IpfilterDlfConverter(3pm)
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