networkd: add basic dbus API

Only the very basics, more to come.

For now:

$ busctl tree org.freedesktop.network1
└─/org/freedesktop/network1
  └─/org/freedesktop/network1/link
    ├─/org/freedesktop/network1/link/1
    ├─/org/freedesktop/network1/link/2
    ├─/org/freedesktop/network1/link/3
    ├─/org/freedesktop/network1/link/4
    ├─/org/freedesktop/network1/link/5
    ├─/org/freedesktop/network1/link/6
    ├─/org/freedesktop/network1/link/7
    ├─/org/freedesktop/network1/link/8
    └─/org/freedesktop/network1/link/9

$ busctl introspect org.freedesktop.network1 /org/freedesktop/network1
NAME                                TYPE      SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.network1.Manager    interface -         -            -
.OperationalState                   property  s         "carrier" emits-change

$ busctl introspect org.freedesktop.network1 /org/freedesktop/network1/link/1
NAME                                TYPE      SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.network1.Link       interface -         -            -
.AdministrativeState                property  s         "unmanaged" emits-change
.OperationalState                   property  s         "carrier" emits-change

1 files changed, 27 insertions, 4 deletions

diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index 4d27272b3b..40328a36c9 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -151,10 +151,6 @@ int manager_connect_bus(Manager *m) {
         } if (r < 0)
                 return r;
 
-        r = sd_bus_attach_event(m->bus, m->event, 0);
-        if (r < 0)
-                return r;
-
         r = sd_bus_add_match(m->bus, &m->prepare_for_sleep_slot,
                              "type='signal',"
                              "sender='org.freedesktop.login1',"
@@ -166,6 +162,26 @@ int manager_connect_bus(Manager *m) {
         if (r < 0)
                 return log_error_errno(r, "Failed to add match for PrepareForSleep: %m");
 
+        r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/network1", "org.freedesktop.network1.Manager", manager_vtable, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add manager object vtable: %m");
+
+        r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/network1/link", "org.freedesktop.network1.Link", link_vtable, link_object_find, m);
+        if (r < 0)
+               return log_error_errno(r, "Failed to add link object vtable: %m");
+
+        r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/network1/link", link_node_enumerator, m);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add link enumerator: %m");
+
+        r = sd_bus_request_name(m->bus, "org.freedesktop.network1", 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to register name: %m");
+
+        r = sd_bus_attach_event(m->bus, m->event, 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to attach bus to event loop: %m");
+
         return 0;
 }
 
@@ -741,6 +757,13 @@ int manager_save(Manager *m) {
                 goto fail;
         }
 
+        if (m->operational_state != operstate) {
+                m->operational_state = operstate;
+                r = manager_send_changed(m, "OperationalState", NULL);
+                if (r < 0)
+                        log_error_errno(r, "Could not emit changed OperationalState: %m");
+        }
+
         return 0;
 
 fail: