Hello Greg:
I commented on this report earlier when I meant to use "reply" hence you did not see my comment:
"This has actually already been fixed under:
https://bugs.isc.org/Ticket/Display.html?id=47757
but it has not yet been released. It should be available in our public repo, now hosted on gitlab:
gitlab.isc.org:isc-projects/dhcp.git
Otherwise it will be available when we release 4.4.2, date TBD."
Regards,
Thomas Markwalder
ISC Software Engineering
On Tue Apr 09 13:48:00 2019, greg.rabil@bt.com wrote:
> Hello,
> Do you have any comment about this bug report?
>
> Thanks,
> Greg Rabil
>
> -----Original Message-----
> From: DHCP Bugs via RT [mailto:dhcp-confidential@isc.org]
> Sent: Tuesday, April 2, 2019 4:34 PM
> To: Rabil,AG,A Gregory,JTK2 R <greg.rabil@bt.com>
> Subject: [ISC-Bugs #49169] AutoReply: DHCP 4.4.1 - Dynamic DNS updates
> are done via TCP instead of UDP
>
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> instead of UDP", and to let you know that we have opened a ticket for
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> ---------------------------------------------------------------------
>
> Bug Report from www.isc.org:
>
> Name: Greg Rabil
> Email: greg.rabil@bt.com
> Software Version: DHCP 4.4.1
> OS: Linux
> Subject:Dynamic DNS updates are done via TCP instead of UDP
>
>
> Bug Detail
> ===========
> In DHCP 4.3, all dynamic DNS updates are performed using UDP. In DHCP
> 4.4, that behavior has changed to use TCP. As far as I can tell, this
> change was not intentional, and instead is a bug caused by changes in
> the BIND library.
>
> In both DHCP 4.3 and 4.4, the common/dns.c source file contains a
> macro that maps ddns_update to dns_client_startupdate. When the
> ddns_modify_fwd function calls ddns_update (dns_client_startupdate),
> it passes DNS_CLIENTRESOPT_ALLOWRUN as the eight argument. The
> bind/include/dns/client.h file defines DNS_CLIENTRESOPT_ALLOWRUN as
> 0x02.
>
> The problem stems from the change in the implementation of the
> dns_client_startupdate function between the bind-9.9.11 package in
> DHCP 4.3 and the bind-9.11.2-p1 package in DHCP 4.4. Specifically, in
> bind-9.9.11, the implementation of dns_client_startupdate in
> lib/dns/client.c references the eight parameter (options) only in this
> line:
>
> UNUSED(options);
>
> However, in bind-9.11-2-p1, the implementation includes the line
> above, as well as this line:
>
> want_tcp = ISC_TF((options & DNS_CLIENTUPDOPT_TCP) != 0);
>
> Note that lib/dns/include/dns/client.h defines DNS_CLIENTUPDOPT_TCP as
> 0x02, which then sets the 'want_tcp' boolean to true.
>
> Since the caller (client.c in DHCP source code) is intending to set
> DNS_CLIENTRESOPT_ALLOWRUN flag via the options parameter, but not the
> DNS_CLIENTUPDOPT_TCP flag, this is the source of the problem, and a
> change in behavior with respect to the DDNS updates using UDP in DHCP
> 4.3 but TCP in DHCP 4.4.
>
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>