netlink: add RTM_GETLINK support to read MAC address

Since we're also now reading responses we need to check sender
credentials to make sure we're talking to the kernel, and not
some other process spoofing netlink.

Signed-off-by: Dan Williams <dan@ioncontrol.co>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/mm-port-net.c b/src/mm-port-net.c
index f1122ef6..a1fb4372 100644
--- a/src/mm-port-net.c
+++ b/src/mm-port-net.c
@@ -97,6 +97,59 @@ mm_port_net_link_setup (MMPortNet            *self,
 
 /*****************************************************************************/
 
+GByteArray *
+mm_port_net_get_hwaddress_finish (MMPortNet     *self,
+                                  GAsyncResult  *res,
+                                  GError       **error)
+{
+    return g_task_propagate_pointer (G_TASK (res), error);
+}
+
+static void
+netlink_get_hwaddress_ready (MMNetlink    *netlink,
+                             GAsyncResult *res,
+                             GTask        *task)
+{
+    GError     *error = NULL;
+    GByteArray *hwaddr;
+
+    hwaddr = mm_netlink_get_hwaddr_finish (netlink, res, &error);
+    if (!hwaddr) {
+        g_prefix_error (&error, "netlink operation failed: ");
+        g_task_return_error (task, error);
+    } else
+        g_task_return_pointer (task, hwaddr, (GDestroyNotify) g_byte_array_unref);
+    g_object_unref (task);
+}
+
+void
+mm_port_net_get_hwaddress (MMPortNet            *self,
+                           GCancellable         *cancellable,
+                           GAsyncReadyCallback   callback,
+                           gpointer              user_data)
+{
+    GTask *task;
+
+    task = g_task_new (self, cancellable, callback, user_data);
+
+    ensure_ifindex (self);
+    if (!self->priv->ifindex) {
+        g_task_return_new_error (task, MM_CORE_ERROR, MM_CORE_ERROR_FAILED,
+                                 "no valid interface index found for %s",
+                                 mm_port_get_device (MM_PORT (self)));
+        g_object_unref (task);
+        return;
+    }
+
+    mm_netlink_get_hwaddr (mm_netlink_get (), /* singleton */
+                           self->priv->ifindex,
+                           cancellable,
+                           (GAsyncReadyCallback) netlink_get_hwaddress_ready,
+                           task);
+}
+
+/*****************************************************************************/
+
 MMPortNet *
 mm_port_net_new (const gchar *name)
 {