Date: Sat, 27 Jan 2001 20:06:24 +0100 (CET) From: klaus@winf.htu.tuwien.ac.at To: FreeBSD-gnats-submit@freebsd.org Subject: bin/24683: obscure natd(8) error message Message-ID: <20010127190624.D0B565D6B@winf.htu.tuwien.ac.at>
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>Number: 24683
>Category: bin
>Synopsis: obscure natd(8) error message
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Jan 27 11:10:04 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Klaus A. Brunner
>Release: FreeBSD 4.2-STABLE i386
>Organization:
HTU Wien, FS WInf
>Environment:
FreeBSD (any version?) running natd(8)
>Description:
There is a rather annoying problem with natd(8)'s error message
"unable to write packet back (...)". This error message may occur
when a host is down, or when a firewall rule prevents natd from
completing a sendto(). The problem is not that this error message
exists, but that it does not give *any* detail (_which_ packet,
addresses?).
The problem is frequently reported on -questions and other lists,
and it's also been bugging me for a while because I just couldn't
figure out what was happening from ipfw logs et al.
>How-To-Repeat:
(see description)
One scenario where this seems to happen frequently is when you're
running Samba and natd on the same box.
>Fix:
This simple patch makes the error message verbose enough to be useful:
--- natd.c Sat Jan 27 19:48:30 2001
+++ /tmp/natd.c Sat Jan 27 19:38:50 2001
@@ -586,7 +586,7 @@
static void FlushPacketBuffer (int fd)
{
int wrote;
- char msgBuf[80];
+ char msgBuf[160];
/*
* Put packet back for processing.
*/
@@ -616,7 +616,8 @@
}
else {
- sprintf (msgBuf, "failed to write packet back");
+ sprintf (msgBuf, "failed to write packet back (%s)",
+ FormatPacket((struct ip*)packetBuf));
Warn (msgBuf);
}
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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