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List:       freebsd-doc
Subject:    docs/102719: [patch] ng_bpf(4) example leads to unneeded promiscuos
From:       Eugene Grosbein <eugen () grosbein ! pp ! ru>
Date:       2006-08-31 6:06:03
Message-ID: 200608310606.k7V663Vm004581 () nkz ! delikates-nk ! ru
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> Number:         102719
> Category:       docs
> Synopsis:       [patch] ng_bpf(4) example leads to unneeded promiscuos mode \
>                 activation
> Confidential:   no
> Severity:       non-critical
> Priority:       low
> Responsible:    freebsd-doc
> State:          open
> Quarter:        
> Keywords:       
> Date-Required:
> Class:          doc-bug
> Submitter-Id:   current-users
> Arrival-Date:   Thu Aug 31 06:10:12 GMT 2006
> Closed-Date:
> Last-Modified:
> Originator:     Eugene Grosbein
> Release:        FreeBSD 6.1-STABLE i386
> Organization:
Svyaz Service JSC
> Environment:
System: FreeBSD nkz.delikates-nk.ru 6.1-STABLE FreeBSD 6.1-STABLE #0: Wed Aug 16 \
20:09:18 KRAST 2006 sa@nkz.delikates-nk.ru:/home/obj/home/src/sys/NKZ i386

> Description:
	ng_bpf(4) teaches to use tcpdump(1) to generate raw BPF
        instructions. However, the exact command line does not
	include	'-p' option. This may activate promiscous mode on
	first ethernet interface, if any. This is not needed and
	should not happen.

> How-To-Repeat:
	Use example from bg_bpf(4) manual page and see pair of
	'promiscuous mode enabled/promiscuous mode disabled' messages
	in the kernel log.

> Fix:

--- src/share/man/man4/ng_bpf.4.orig	Sat Feb  5 18:31:31 2005
+++ src/share/man/man4/ng_bpf.4	Thu Aug 31 13:49:15 2006
@@ -170,7 +170,7 @@
 }
 xxENDxx
 
-BPFPROG=`tcpdump -s 8192 -ddd ${PATTERN} | awk -f /tmp/bpf.awk`
+BPFPROG=`tcpdump -s 8192 -i lo0 -p -ddd ${PATTERN} | awk -f /tmp/bpf.awk`
 
 ngctl msg ${NODEPATH} setprogram { thisHook=\\"${INHOOK}\\" \\
   ifMatch=\\"${MATCHHOOK}\\" \\


> Release-Note:
> Audit-Trail:
> Unformatted:
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