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Message-Id: <200212091226.gB9CQjJc046365@curry.mchp.siemens.de>
Date: Mon, 9 Dec 2002 13:26:45 +0100 (CET)
From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: PATCH: tcpdump needs -a flag if netmask is set to 0xffffffff
X-Send-Pr-Version: 3.113
X-GNATS-Notify:

>Number:         46123
>Category:       bin
>Synopsis:       PATCH: tcpdump needs -a flag if netmask is set to 0xffffffff
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    fenner
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 09 04:30:01 PST 2002
>Closed-Date:    Mon Aug 22 15:15:16 GMT 2005
>Last-Modified:  Mon Aug 22 15:15:16 GMT 2005
>Originator:     Andre Albsmeier
>Release:        FreeBSD 4.7-STABLE i386
>Organization:
>Environment:

System: 4.7-STABLE FreeBSD #0: Fri Nov 29 09:27:20 CET 2002

>Description:

If the -a flag was not specified tcpdump doesn't convert network and
broadcast addresses to names. However, it treats everything as a
broadcast address if the interface has a netmask of 0xffffffff (recent
versions of ppp set the netmask to 0xffffffff for the tun0 interface).
This means that even non-broadcast/network destined traffic won't
get their addresses converted.

>How-To-Repeat:

If you use a recent version of ppp the netmask should be 0xffffffff:

andre@gate:~>ifconfig tun0
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1492
        inet 217.88.xxx.yyy --> 217.5.98.95 netmask 0xffffffff 
        Opened by PID 15634

If you run a tcpdump on tun0 (without -a) you see your traffic
but it won't be converted to names.


>Fix:

The patch disables the check for broadcast/network addresses if the
netmask is set to 0xffffffff:

--- contrib/tcpdump/addrtoname.c.ORI	Thu Sep 12 09:56:44 2002
+++ contrib/tcpdump/addrtoname.c	Sat Sep 14 12:35:10 2002
@@ -200,6 +200,7 @@
 	if (!nflag &&
 	    (addr & f_netmask) == f_localnet &&
 	    (aflag ||
+	    netmask == 0xffffffff ||
 	    !((addr & ~netmask) == 0 || (addr | netmask) == 0xffffffff))) {
 		if (!setjmp(getname_env)) {
 			(void)setsignal(SIGALRM, nohostname);

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->fenner 
Responsible-Changed-By: fenner 
Responsible-Changed-When: Mon Mar 3 10:11:12 PST 2003 
Responsible-Changed-Why:  
I am "mr. tcpdump" 

http://www.freebsd.org/cgi/query-pr.cgi?pr=46123 
State-Changed-From-To: open->feedback 
State-Changed-By: bms 
State-Changed-When: Mon Jun 14 15:12:48 GMT 2004 
State-Changed-Why:  
Can you reproduce this problem with a more recent version of tcpdump, 
e.g. 3.8.3 in -CURRENT or ports? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=46123 

From: Andre Albsmeier <Andre.Albsmeier@siemens.com>
To: bug-followup@FreeBSD.org, andre.albsmeier@mchp.siemens.de
Cc:  
Subject: Re: bin/46123: PATCH: tcpdump needs -a flag if netmask is set to 0xffffffff
Date: Mon, 22 Aug 2005 09:31:08 +0200

 Please close this PR.
 
 Newer versions of FreeBSD (I tried 5.4-STABLE)
 don't have this problem anymore.
State-Changed-From-To: feedback->closed 
State-Changed-By: fenner 
State-Changed-When: Mon Aug 22 15:14:49 GMT 2005 
State-Changed-Why:  
Fixed in recent (or perhaps not-so recent) tcpdump imports. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=46123 
>Unformatted:
