NetBSD Problem Report #50191

From www@NetBSD.org  Wed Sep  2 07:51:27 2015
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	for <gnats-bugs@gnats.NetBSD.org>; Wed,  2 Sep 2015 07:51:27 +0000 (UTC)
Message-Id: <20150902075126.1E198A65B7@mollari.NetBSD.org>
Date: Wed,  2 Sep 2015 07:51:26 +0000 (UTC)
From: taca@back-street.net
Reply-To: taca@back-street.net
To: gnats-bugs@NetBSD.org
Subject: /etc/rc.d/ntpd should also copy resolv.conf to chroot dir
X-Send-Pr-Version: www-1.0

>Number:         50191
>Category:       bin
>Synopsis:       /etc/rc.d/ntpd should also copy resolv.conf to chroot dir
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    bin-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 02 07:55:00 +0000 2015
>Closed-Date:    Wed Apr 24 12:05:16 +0000 2019
>Last-Modified:  Wed Apr 24 12:05:16 +0000 2019
>Originator:     Takahiro Kambe
>Release:        NetBSD 6.1_STABLE
>Organization:
K. I. S. U. Inc.
>Environment:
NetBSD nora.i.kisu.co.jp 6.1_STABLE NetBSD 6.1_STABLE (VMWARE-F7) #13: Tue Jul 14 17:24:53 JST 2015 sisbic-info@kisu.co.jp:/data/NetBSD-6/amd64.obj/sys/arch/amd64/compile/VMWARE-F7 amd64
Architecture: x86_64
Machine: amd64
>Description:
/etc/rc.d/ntpd should also copy resolv.conf to chroot directory.
>How-To-Repeat:
1. Run host without locally running DNS name server but specify
   name server(s) on other hosts in /etc/resolv.conf.
2. Prepare ntpd to start; configure /etc/ntp.conf properly
   refering NTP server using *hostname*.
3. In /etc/rc.conf, add these lines:

	ntpd=YES
	ntpd_chrootdir="/var/chroot/ntpd"

4. Start ntpd:

	# sh /etc/rc.d/ntpd start

Then, ntpd process dose not solve hostnames in ntp.conf trying to
resolve with local name server (which dose not exist).
>Fix:
Copy /etc/resolv.conf as /etc/services in /etc/rc.d/ntpd.

>Release-Note:

>Audit-Trail:
From: David Holland <dholland-bugs@netbsd.org>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: bin/50191: /etc/rc.d/ntpd should also copy resolv.conf to chroot
 dir
Date: Sun, 6 Sep 2015 00:07:32 +0000

 On Wed, Sep 02, 2015 at 07:55:00AM +0000, taca@back-street.net wrote:
  > >Description:
  > /etc/rc.d/ntpd should also copy resolv.conf to chroot directory.
  > >How-To-Repeat:
  > 1. Run host without locally running DNS name server but specify
  >    name server(s) on other hosts in /etc/resolv.conf.
  > 2. Prepare ntpd to start; configure /etc/ntp.conf properly
  >    refering NTP server using *hostname*.
  > 3. In /etc/rc.conf, add these lines:
  > 
  > 	ntpd=YES
  > 	ntpd_chrootdir="/var/chroot/ntpd"
  > 
  > 4. Start ntpd:
  > 
  > 	# sh /etc/rc.d/ntpd start
  > 
  > Then, ntpd process dose not solve hostnames in ntp.conf trying to
  > resolve with local name server (which dose not exist).
  > >Fix:
  > Copy /etc/resolv.conf as /etc/services in /etc/rc.d/ntpd.

 What happens if /etc/resolv.conf is being manipulated by dhcp?

 (Maybe we just don't care about that case...)

 -- 
 David A. Holland
 dholland@netbsd.org

From: Takahiro Kambe <taca@back-street.net>
To: gnats-bugs@NetBSD.org, dholland-bugs@netbsd.org
Cc: 
Subject: Re: bin/50191: /etc/rc.d/ntpd should also copy resolv.conf to
 chroot dir
Date: Sun, 06 Sep 2015 14:26:09 +0900 (JST)

 In message <20150906001007.1BCFAA65BC@mollari.NetBSD.org>
 	on Sun,  6 Sep 2015 00:10:07 +0000 (UTC),
 	David Holland <dholland-bugs@netbsd.org> wrote:
 >   > >Fix:
 >   > Copy /etc/resolv.conf as /etc/services in /etc/rc.d/ntpd.
 >  
 >  What happens if /etc/resolv.conf is being manipulated by dhcp?
 It become problem,

 * Connecting network was changed and name servers' IP address changed, too.
 * With some reason, reconfigure NTP server without restarting ntpd.

 In other cases, ntpd will start after getting IP address via DHCP, so
 it would not problem.

 >  (Maybe we just don't care about that case...)
 Sure.

 -- 
 Takahiro Kambe <taca@back-street.net>

From: Roy Marples <roy@marples.name>
To: gnats-bugs@NetBSD.org, dholland-bugs@netbsd.org,
 Takahiro Kambe <taca@back-street.net>
Cc: 
Subject: Re: bin/50191: /etc/rc.d/ntpd should also copy resolv.conf to chroot
 dir
Date: Thu, 18 Aug 2016 15:56:16 +0100

 libc will query the localhost resolver if resolv.conf is not present or
 no nameserver is specified.

 The correct solution is to run a resolver on the localhost.

 Roy

From: Takahiro Kambe <taca@back-street.net>
To: roy@marples.name
Cc: gnats-bugs@NetBSD.org, dholland-bugs@netbsd.org
Subject: Re: bin/50191: /etc/rc.d/ntpd should also copy resolv.conf to
 chroot dir
Date: Sat, 20 Aug 2016 14:19:41 +0900 (JST)

 In message <0d94857b-f013-be2c-bea8-1a6c55976dfb@marples.name>
 	on Thu, 18 Aug 2016 15:56:16 +0100,
 	Roy Marples <roy@marples.name> wrote:
 > libc will query the localhost resolver if resolv.conf is not present or
 > no nameserver is specified.
 I know it.

 > The correct solution is to run a resolver on the localhost.
 Your "resolver" is "caching server".

 Prerequisite is the case of a simple client machine which dose not
 (want to) run such a server.

 -- 
 Takahiro Kambe <taca@back-street.net>

State-Changed-From-To: open->closed
State-Changed-By: maya@NetBSD.org
State-Changed-When: Wed, 24 Apr 2019 12:05:16 +0000
State-Changed-Why:
Duplicate 49380, which has a commit.


>Unformatted:

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