From 0a94b0138de65ae88e783143d2c4cab930303844 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan@ioncontrol.co>
Date: Mon, 2 Dec 2024 09:39:21 -0600
Subject: 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>
---
 src/mm-port-net.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

(limited to 'src/mm-port-net.c')

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)
 {
-- 
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