Re: [PATCH] Add forwarders attribute to <dns /> element.

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On Mon, Sep 02, 2013 at 08:50:30AM -0300, Diego Woitasen wrote:
> Useful to set custom forwarders instead of using the contents of
> /etc/resolv.conf. It helps me to setup dnsmasq as local nameserver to resolv VM
> domain names from domain 0, when domain option is used.
> 
> Signed-off-by: Diego Woitasen <diego.woitasen@xxxxxxxxxxx>
> ---
>  src/conf/network_conf.c                            | 34 +++++++++++++++++++++-
>  src/conf/network_conf.h                            |  1 +
>  src/network/bridge_driver.c                        |  8 +++++
>  .../nat-network-dns-forwarders.conf                | 15 ++++++++++
>  .../nat-network-dns-forwarders.xml                 |  9 ++++++
>  tests/networkxml2conftest.c                        |  1 +
>  6 files changed, 67 insertions(+), 1 deletion(-)
>  create mode 100644 tests/networkxml2confdata/nat-network-dns-forwarders.conf
>  create mode 100644 tests/networkxml2confdata/nat-network-dns-forwarders.xml
> 


> @@ -1058,6 +1065,20 @@ virNetworkDNSDefParseXML(const char *networkName,
>          }
>      }
>  
> +    forwarders = virXPathString("string(./@forwarders)", ctxt);
> +    if (forwarders) {
> +        def->forwarders = virStringSplit(forwarders, ",", 0);

It is frowned upon to create XML where one attribute encodes multiple
separate values. For example, makes it impossible for apps to extract
a single value using xpath queies.

If we need to support multiple addresses for forwarders, then this
suggests we need a child element underneath <dns> eg perhaps

  <dns>
    <forwarder addr='8.8.8.8'/>
    <forwarder addr='1.2.3.4'/>
    <forwarder addr='234:223::4242'/>
  </dns>


Daniel
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