[libvirt] [PATCH v3] leaseshelper: improvements to support all events

[Nehal J Wani]

On Mon, Aug 4, 2014 at 1:29 PM, Nehal J Wani <nehaljw.kkd1 at gmail.com> wrote:
>
> This patch enables the helper program to detect event(s) triggered when there
> is a change in lease length or expiry and client-id. This transfers complete
> control of leases database to libvirt and obsoletes use of the lease database
> file (<network-name>.leases). That file will not be created, read, or written.
> This is achieved by adding the option --leasefile-ro to dnsmasq and passing a
> custom env var to leaseshelper, which helps us map events related to leases
> with their corresponding network bridges, no matter what the event be.
>
> Also, this requires the addition of a new non-lease entry in our custom lease
> database: "server-duid". It is required to identify a DHCPv6 server.
>
> Now that dnsmasq doesn't maintain its own leases database, it relies on our
> helper program to tell it about previous leases and server duid. Thus, this
> patch makes our leases program honor an extra action: "init", in which it sends
> the known info in a particular format to dnsmasq by printing it to stdout.
>
> ---
>
>  This is compatible with libvirt 1.2.6 as only additions have been
>  introduced, and the old leases file (*.status) will still be supported.
>
>  v3: * Add server-duid as an entry in the lease object for every ipv6 lease.
>      * Remove unnecessary variables and double copies.
>      * Take value from DNSMASQ_OLD_HOSTNAME if hostname is not known.
>
>  v2: http://www.redhat.com/archives/libvir-list/2014-July/msg01109.html
>
>  v1: https://www.redhat.com/archives/libvir-list/2014-July/msg00568.html
>
>  src/network/bridge_driver.c |   3 +
>  src/network/leaseshelper.c  | 132 +++++++++++++++++++++++++++++++++++---------
>  2 files changed, 109 insertions(+), 26 deletions(-)
>
> diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
> index 965fdec..b578b3a 100644
> --- a/src/network/bridge_driver.c
> +++ b/src/network/bridge_driver.c

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