From 80899629519139a7eb86842942a9471d05eb4112 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Thu, 23 Dec 2021 11:37:00 +0100
Subject: [PATCH] lib: extract NETWORK_ADDRESS and NETWORK_PREFIX as macros

The 169.254.0.0/16 network specification (for the appliance) is currently
duplicated between the direct backend and the libvirt backend. In a
subsequent patch, we're going to need the network specification in yet
another spot; extract it now to the NETWORK_ADDRESS and NETWORK_PREFIX
macros (simply as strings).

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2034160
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20211223103701.12702-3-lersek@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
(cherry picked from commit 216de164e091a5c36403f24901698044a43ae0d9)
---
 lib/guestfs-internal.h | 6 ++++++
 lib/launch-direct.c    | 2 +-
 lib/launch-libvirt.c   | 3 ++-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/guestfs-internal.h b/lib/guestfs-internal.h
index 8eb2dd3ad..e24d570f5 100644
--- a/lib/guestfs-internal.h
+++ b/lib/guestfs-internal.h
@@ -183,6 +183,12 @@ cleanup_mutex_unlock (pthread_mutex_t **ptr)
 #endif
 #endif
 
+/* Network address and network mask (expressed as address prefix) that the
+ * appliance will see (if networking is enabled).
+ */
+#define NETWORK_ADDRESS "169.254.0.0"
+#define NETWORK_PREFIX  "16"
+
 /* Guestfs handle and associated structures. */
 
 /* State. */
diff --git a/lib/launch-direct.c b/lib/launch-direct.c
index e5b9a5611..4f038f4f0 100644
--- a/lib/launch-direct.c
+++ b/lib/launch-direct.c
@@ -689,7 +689,7 @@ launch_direct (guestfs_h *g, void *datav, const char *arg)
     start_list ("-netdev") {
       append_list ("user");
       append_list ("id=usernet");
-      append_list ("net=169.254.0.0/16");
+      append_list ("net=" NETWORK_ADDRESS "/" NETWORK_PREFIX);
     } end_list ();
     start_list ("-device") {
       append_list (VIRTIO_DEVICE_NAME ("virtio-net"));
diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c
index 9e8336938..266d88824 100644
--- a/lib/launch-libvirt.c
+++ b/lib/launch-libvirt.c
@@ -1843,7 +1843,8 @@ construct_libvirt_xml_qemu_cmdline (guestfs_h *g,
       } end_element ();
 
       start_element ("qemu:arg") {
-        attribute ("value", "user,id=usernet,net=169.254.0.0/16");
+        attribute ("value",
+                   "user,id=usernet,net=" NETWORK_ADDRESS "/" NETWORK_PREFIX);
       } end_element ();
 
       start_element ("qemu:arg") {
-- 
2.31.1