Date: Fri, 25 Oct 2002 20:13:41 -0700 From: Peter Wemm <peter@wemm.org> To: John De Boskey <jwd@bsdwins.com> Cc: Current List <freebsd-current@freebsd.org> Subject: Re: Local DNS lookup by sshd? Message-ID: <20021026031341.419932A88D@canning.wemm.org> In-Reply-To: <20021026021753.GA95524@BSDWins.Com>
next in thread | previous in thread | raw e-mail | index | archive | help
John De Boskey wrote:
> Hi,
>
> When logging into a current 5.0 system via ssh, I see the following
> written to the system console (the 'xxx's are my whiteout):
>
> ... kernel: Connection attempt to UDP xxx.58.184.35:53 from xxx.58.184.35:492
53
> ... kernel: Connection attempt to UDP xxx.58.184.35:53 from xxx.58.184.35:492
54
> ... kernel: Connection attempt to UDP xxx.58.184.35:53 from xxx.58.184.35:492
55
> ... kernel: Connection attempt to UDP xxx.58.184.35:53 from xxx.58.184.35:492
56
>
> Basically, it looks like it is trying to talk to a DNS on the
> localhost. However, I do not have DNS running. I do not have localhost listed
> in /etc/resolv.conf. /etc/nsswitch.conf lists 'hosts: files dns' and putting
> my ssh origination id in /etc/hosts has no effect.
>
> It appears to be related to code in canohost.c. Before I start debugging,
> I thought I'd ask if anyone knew if there is a reason for this behaviour,
> or where it might be coming from (specifically).
Are you using privsep? If so, I think this is expected. The unpriviliged
side runs in a chroot under /var/empty. This means, that it cannot see any
/etc/nsswitch.conf and cannot see any /etc/resolv.conf or /etc/hosts.
And the resolver client library defaults querying on the first interface,
and in your case it used localhost.
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20021026031341.419932A88D>