lxc: Add support to lxcDomainInterfaceAddresses() function

LXC driver is not able to retrieve IP addresses from domains. This
function was not implemented yet. It can be done using DHCP lease and
ARP table. Different from QEMU, LXC does not have an agent to fetch
this info, but other sources can be used.
Signed-off-by: NJulio Faracco <jcfaracco@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/lxc/lxc_driver.c

@@ -1740,6 +1740,49 @@ static int lxcConnectGetVersion(virConnectPtr conn, unsigned long *version)
 }
 
 
+static int
+lxcDomainInterfaceAddresses(virDomainPtr dom,
+                            virDomainInterfacePtr **ifaces,
+                            unsigned int source,
+                            unsigned int flags)
+{
+    virDomainObjPtr vm = NULL;
+    int ret = -1;
+
+    virCheckFlags(0, -1);
+
+    if (!(vm = lxcDomObjFromDomain(dom)))
+        goto cleanup;
+
+    if (virDomainInterfaceAddressesEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if (virDomainObjCheckActive(vm) < 0)
+        goto cleanup;
+
+    switch (source) {
+    case VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE:
+        ret = virDomainNetDHCPInterfaces(vm->def, ifaces);
+        break;
+
+    case VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_ARP:
+        ret = virDomainNetARPInterfaces(vm->def, ifaces);
+        break;
+
+    default:
+        virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED,
+                       _("Unknown IP address data source %d"),
+                       source);
+        break;
+    }
+
+ cleanup:
+    virDomainObjEndAPI(&vm);
+    return ret;
+}
+
+
+
 static char *lxcConnectGetHostname(virConnectPtr conn)
 {
     if (virConnectGetHostnameEnsureACL(conn) < 0)
@@ -5515,6 +5558,7 @@ static virHypervisorDriver lxcHypervisorDriver = {
     .domainGetMetadata = lxcDomainGetMetadata, /* 1.1.3 */
     .domainGetCPUStats = lxcDomainGetCPUStats, /* 1.2.2 */
     .domainGetHostname = lxcDomainGetHostname, /* 6.0.0 */
+    .domainInterfaceAddresses = lxcDomainInterfaceAddresses, /* 6.1.0 */
     .nodeGetMemoryParameters = lxcNodeGetMemoryParameters, /* 0.10.2 */
     .nodeSetMemoryParameters = lxcNodeSetMemoryParameters, /* 0.10.2 */
     .domainSendProcessSignal = lxcDomainSendProcessSignal, /* 1.0.1 */