Bug 672551

Summary: DHCPv6 server creates a lease file that it cannot parse
Product: Red Hat Enterprise Linux 6 Reporter: Joseph Kachuck <jkachuck>
Component: dhcpAssignee: Jiri Popelka <jpopelka>
Status: CLOSED ERRATA QA Contact: Release Test Team <release-test-team>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.0CC: mganisin, ovasik, tcapek
Target Milestone: rcKeywords: OtherQA
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: dhcp-4.1.1-16.P1.el6 Doc Type: Bug Fix
Doc Text:
Previously, the dhcpd service with IPv6 support sometimes created a lease file that it was unable to parse. Consequently, once the service was restarted, it went into a loop and could not start. This bug has been fixed and now the service is able to properly parse all lease files it generates.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2011-05-19 14:05:10 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 684385    
Attachments:
Description Flags
dhcp-4.1.1-parsing-fixes.patch
none
dhclient-4.1.1-17.P1.el6.x86_64.rpm
none
dhcp-4.1.1-17.P1.el6.x86_64.rpm none

Description Joseph Kachuck 2011-01-25 15:21:40 UTC 
Created attachment 475182 [details]
dhcp-4.1.1-parsing-fixes.patch

---Problem Description---
When testing IPv6 DHCP server, certain test cases cause the server to generate
a DHCP leases file with incorrect syntax. The next time the DHCP server
restarts, it is unable to parse this leases file and goes into an infinite
loop. Here is a sample of the output:

[root@athena3-nut7 ~]# dhcpd -6 -cf /tmp/tahi/dhcpd/dhcpd6.conf -lf
/tmp/tahi/dhcpd/dhcpd6.leases -pf /tmp/tahi/dhcpd/dhcpd6.pid eth0
Internet Systems Consortium DHCP Server 4.1.1-P1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not
specified in the config file
/tmp/tahi/dhcpd/dhcpd6.leases line 33: semicolon expected.
}
^
/tmp/tahi/dhcpd/dhcpd6.leases line 34: corrupt lease file; expecting ia_na
contents, got '

'

^

The second of these error messages is then repeated in an infinite loop, and
the DHCP server is never able to start.

I downloaded the source code for DHCP 4.1.2 from
http://www.isc.org/software/dhcp and found that this problem had already been
fixed. I ported the appropriate patches back to 4.1.1-P1 and rebuilt the rpm.
After re-running the tests, we no longer encounter the above errors.

---uname output---
Linux athena3-nut7.linuxperf9025.net 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1
01:33:01 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

Machine Type = KVM guest on a x3950m2 RHEL6 host

---Steps to Reproduce---
Install the Tahi IPv6-conformance test suite and the DHCPv6 package.
- http://www.tahi.org/
- http://www.tahi.org/logo/dhcpv6/

Install RHEL6 on the node-under-test.

Run the dhcpv6.p2 server tests.

I have a KVM setup where I can demonstrate this test in more detail if there
are any questions or issues with the proposed patch.

---Network Component Data---
Userspace tool common name: dhcp

Userspace rpm: dhcp-4.1.1-12.P1.el6.x86_64
Comment 6 Joseph Kachuck 2011-03-15 17:36:30 UTC 
=== In Red Hat Customer Portal Case 00410827 ===
--- Comment by IBM bug, proxy on 3/15/2011 1:13 PM ---

------- Comment From kevcorry.com 2011-03-15 13:03 EDT-------
I will test out the new dhcp packages in the next day or two and post the results.
Comment 7 IBM Bug Proxy 2011-03-26 17:25:34 UTC 
------- Comment From prem.karat.ibm.com 2011-02-23 05:42 EDT-------
(In reply to comment #6)
> Hello,
> I have sent this up for engineering to review.
>
> Thank You
> Joe Kachuck

Hi Joe

Can you confirm if this is accepted?

Cheers,
Prem
Comment 8 IBM Bug Proxy 2011-03-26 17:25:40 UTC 
Created attachment 487922 [details]
dhclient-4.1.1-17.P1.el6.x86_64.rpm
Comment 9 IBM Bug Proxy 2011-03-26 17:25:49 UTC 
Created attachment 487923 [details]
dhcp-4.1.1-17.P1.el6.x86_64.rpm
Comment 10 IBM Bug Proxy 2011-03-28 16:45:44 UTC 
------- Comment From kevcorry.com 2011-03-28 12:32 EDT-------
I reran the DHCP tests using the new RPMs, and the parsing errors in the leases file no longer occur.
Comment 11 IBM Bug Proxy 2011-05-09 16:40:47 UTC 
------- Comment From kevcorry.com 2011-05-09 12:33 EDT-------
I verified this fix in RHEL 6.1 rc1.
Comment 12 Tomas Capek 2011-05-10 14:24:33 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Previously, the dhcpd service with IPv6 support sometimes created a lease file that it was unable to parse. Consequently, once the service was restarted, it went into a loop and could not start. This bug has been fixed and now the service is able to properly parse all lease files it generates.
Comment 13 errata-xmlrpc 2011-05-19 14:05:10 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-0697.html