Devuan bug report logs - #421
isc-dhcp-client: no ipv6 prefix set automatically

Package: isc-dhcp-client; Reported by: Adrian Zaugg <adi@ente.limmat.ch>; Keywords: debian; Done: Mark Hindley <mark@hindley.org.uk>; Maintainer for isc-dhcp-client is (unknown).

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Date: Mon, 6 Apr 2020 09:59:40 +0100
From: Mark Hindley <mark@hindley.org.uk>
To: 421-done@bugs.devuan.org
Subject: Re: reported to Debian under #955825
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On Sun, 5 Apr 2020 13:58:54 +0200 Adrian Zaugg <adi@ente.limmat.ch> wrote:
> 
> Could you please close this bug, I reported it to Debian directly. You
> can find it under #955825 [1]. Thank you.
> 
> 
> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=955825

Thanks.

Closing here.

Mark

Notification sent to Adrian Zaugg <adi@ente.limmat.ch>:
bug acknowledged by developer. Full text available.
Reply sent to Mark Hindley <mark@hindley.org.uk>:
You have taken responsibility. Full text available.

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From: Adrian Zaugg <adi@ente.limmat.ch>
Subject: reported to Debian under #955825
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Could you please close this bug, I reported it to Debian directly. You
can find it under #955825 [1]. Thank you.


[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=955825

Acknowledgement sent to Adrian Zaugg <adi@ente.limmat.ch>:
Extra info received and forwarded to list. Copy sent to devuan-dev@lists.dyne.org. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, devuan-dev@lists.dyne.org:
bug#421; Package isc-dhcp-client. Full text available.
Added tag(s) debian. Request was from Mark Hindley <mark@hindley.org.uk> to 421-submit@bugs.devuan.org. Full text available.

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Date: Sun, 5 Apr 2020 09:48:59 +0100
From: Mark Hindley <mark@hindley.org.uk>
To: Adrian Zaugg <adi@ente.limmat.ch>, 421@bugs.devuan.org
Subject: Re: bug#421: isc-dhcp-client: no ipv6 prefix set automatically
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Control: tags -1 debian

On Sat, Apr 04, 2020 at 11:00:28PM +0200, Adrian Zaugg wrote:
> Package: isc-dhcp-client
> Version: 4.3.5-3+deb9u1
> Severity: important
> 
> Requesting an address over dhcp6 does not set the ipv6 prefix length. The address received seems always get 
> a /128 prefix set, even if the dhcp6 server sends another one. 

Adrian,

Thanks for this. However isc-dhcp-client is not a forked package and Devuan uses
the Debian pacakges directly. You would be better reporting this directly to
Debian's BTS.

Thanks.

Mark

Information forwarded to devuan-bugs@lists.dyne.org, devuan-dev@lists.dyne.org:
bug#421; Package isc-dhcp-client. Full text available.

Message received at submit@bugs.devuan.org:


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From: Adrian Zaugg <adi@ente.limmat.ch>
To: Devuan Bug Tracking System <submit@bugs.devuan.org>
Subject: isc-dhcp-client: no ipv6 prefix set automatically
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Package: isc-dhcp-client
Version: 4.3.5-3+deb9u1
Severity: important

Requesting an address over dhcp6 does not set the ipv6 prefix length. The address received seems always get 
a /128 prefix set, even if the dhcp6 server sends another one. 

I expect dhclient to set the prefix lenght, if the dhcp6 server sends one.

The code in /sbin/dhclient-script under "### DHCPv6 Handlers" is the same in ascii and Debian/unstable (4.4.1-2.1+b2). 

It has a mark "TODO: handle prefix change: ?based on ${old_ip6_prefix} and ${new_ip6_prefix}?"... In the code that 
does set the ipv6 address using iproute2 there is no prefix mentioned. See line 385 and the following:

    385     BOUND6|RENEW6|REBIND6)
    386         if [ "${new_ip6_address}" ]; then
    387             # set leased IP
    388             ip -6 addr add ${new_ip6_address} \
    389                 dev ${interface} scope global
    390         fi

This part has two problems: It should also be called upon reason REBOOT6 (see dhclient-script(8)) and it 
should set the prefix if one was given. I suggest to change this to:

    385     BOUND6|RENEW6|REBIND6|REBOOT6)
    386         if [ "${new_ip6_address}" ]; then
    387 
    388             # check wether a prefix was passed and add it to the address
    389             if [ -n "$new_ip6_prefixlen" ]; then
    390                 new_ip6_address_and_prefix="${new_ip6_address}/${new_ip6_prefixlen}"
    391             else
    392                 new_ip6_address_and_prefix="${new_ip6_address}"
    393             fi
    394 
    395             # set leased IP
    396             ip -6 addr add ${new_ip6_address_and_prefix} \
    397                 dev ${interface} scope global

According to my tests this resolves the problem. Please review.


Regards, Adrian.


-- System Information:
Distributor ID:	Devuan
Description:	Devuan GNU/Linux 2.1 (ascii)
Release:	2.1
Codename:	ascii

Architecture: x86_64

Kernel: Linux 4.9.0-12-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages isc-dhcp-client depends on:
ii  debianutils       4.8.1.1
ii  iproute2          4.9.0-1+deb9u1
ii  libc6             2.24-11+deb9u4
ii  libdns-export162  1:9.10.3.dfsg.P4-12.3+deb9u5
ii  libisc-export160  1:9.10.3.dfsg.P4-12.3+deb9u5

Versions of packages isc-dhcp-client recommends:
ii  isc-dhcp-common  4.3.5-3+deb9u1

Versions of packages isc-dhcp-client suggests:
pn  avahi-autoipd         <none>
pn  isc-dhcp-client-ddns  <none>
ii  resolvconf            1.79

-- Configuration Files:
/etc/dhcp/debug changed [not included]

-- no debconf information

Acknowledgement sent to Adrian Zaugg <adi@ente.limmat.ch>:
New bug report received and forwarded. Copy sent to devuan-dev@lists.dyne.org.

Your message specified a Severity: in the pseudo-header, but the severity value important was not recognised. The default severity normal is being used instead. The recognised values are: critical, grave, normal, minor, wishlist.

Full text available.


Report forwarded to devuan-bugs@lists.dyne.org, devuan-dev@lists.dyne.org:
bug#421; Package isc-dhcp-client. Full text available.

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1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.

Devuan Bugs Owner <owner@bugs.devuan.org>.
Last modified: Sat, 4 Jul 2020 00:39:02 UTC