[libvirt] [PATCH] test_driver: implement virDomainInterfaceAddresses

[Ilias Stamatis]

On Thu, May 23, 2019 at 9:46 AM Erik Skultety <eskultet at redhat.com> wrote:
>
> On Wed, May 22, 2019 at 10:10:34PM +0200, Ilias Stamatis wrote:
> > Ignore @source in the case of the test driver and return fixed private
> > IPv4 addresses for all the interfaces defined in the domain.
> >
> > Signed-off-by: Ilias Stamatis <stamatis.iliass at gmail.com>
> > ---
> >
> > The default config of the test driver has no guest interfaces defined,
> > so this must be tested with a custom config.
> >
> > Maybe it would be a good idea to add one or more guest interfaces in the
> > default config. I could send an additional patch for this.
>
> I agree and at the same time I think that patch and this one should be part of
> the same series.

Sure, I'll add that. One interface would be sufficient I suppose? How
about the following?

<interface type='network'>
  <mac address='aa:bb:cc:dd:ee:ff'/>
  <source network='default' bridge='virbr0'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x00' function='0x0'/>
</interface>

>
> >
> >  src/test/test_driver.c | 71 ++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 71 insertions(+)
> >
> > diff --git a/src/test/test_driver.c b/src/test/test_driver.c
> > index a4c17ef0df..3a81f51a88 100644
> > --- a/src/test/test_driver.c
> > +++ b/src/test/test_driver.c
> > @@ -3220,6 +3220,76 @@ static int testDomainBlockStats(virDomainPtr domain,
> >      return ret;
> >  }
> >
> > +static int
> > +testDomainInterfaceAddresses(virDomainPtr dom,
> > +                             virDomainInterfacePtr **ifaces,
> > +                             unsigned int source ATTRIBUTE_UNUSED,
> > +                             unsigned int flags)
> > +{
> > +    size_t i;
> > +    size_t ifaces_count = 0;
> > +    int ret = -1;
> > +    char ipaddr[32];
> > +    char macaddr[VIR_MAC_STRING_BUFLEN];
> > +    virDomainObjPtr vm = NULL;
> > +    virDomainInterfacePtr iface = NULL;
> > +    virDomainInterfacePtr *ifaces_ret = NULL;
> > +
> > +    virCheckFlags(0, -1);
> > +
> > +    if (!(vm = testDomObjFromDomain(dom)))
> > +        goto cleanup;
> > +
> > +    if (virDomainObjCheckActive(vm) < 0)
> > +        goto cleanup;
> > +
> > +    if (VIR_ALLOC_N(ifaces_ret, vm->def->nnets) < 0)
> > +        goto cleanup;
> > +
> > +    for (i = 0; i < vm->def->nnets; i++) {
> > +        if (VIR_ALLOC(iface) < 0)
> > +            goto cleanup;
> > +
> > +        if (VIR_STRDUP(iface->name, vm->def->nets[i]->ifname) < 0)
> > +            goto cleanup;
> > +
> > +        virMacAddrFormat(&(vm->def->nets[i]->mac), macaddr);
> > +        if (VIR_STRDUP(iface->hwaddr, macaddr) < 0)
> > +            goto cleanup;
> > +
> > +        if (VIR_ALLOC(iface->addrs) < 0)
> > +            goto cleanup;
> > +
> > +        iface->addrs[0].type = VIR_IP_ADDR_TYPE_IPV4;
> > +        iface->addrs[0].prefix = 24;
> > +
> > +        sprintf(ipaddr, "192.168.0.%ld", 100 + (i % 155));
>
> It's test driver do we expect to be dealing with that many interfaces? I think
> '100 + i' or even 'i + i' would be just fine, we don't need to overcomplicate
> it.

I agree in general, but I don't think it's really overcomplicated
here, it's just 5 extra chars. :D Why not reply with results that make
sense in all cases?

>
> > +        if (VIR_STRDUP(iface->addrs[0].addr, ipaddr) < 0)
> > +            goto cleanup;
>
> How about using virAsprintf directly into iface->addrs[0].addr? (sprintf is also
> blacklisted by the syntax-check)
>

Aah, great! I wasn't aware of this function, I'll change it to use that.

Btw, how can I run this syntax-check you refer to or see which
functions are blacklisted?

> > +
> > +        iface->naddrs = 1;
> > +
> > +        VIR_STEAL_PTR(ifaces_ret[i], iface);
>
> We usually use VIR_APPEND_ELEMENT for ^this, it also takes the ifaces_count
> counter which it increments for you, but since you already pre-allocated the
> list earlier, you'd be interested in the _INPLACE version of the same macro.
>

Cool, I'll implement all these and re-send.

Thanks for the review!

Ilias