networkd: expose DHCP server pool size and offset via DBus (#41137)

src/network/networkd-dhcp-server-bus.c

@@ -74,6 +74,46 @@ static int property_get_leases(
         return sd_bus_message_close_container(reply);
 }
 
+static int property_get_pool_size(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+        Link *l = ASSERT_PTR(userdata);
+        sd_dhcp_server *s;
+        uint32_t v;
+
+        assert(reply);
+
+        s = l->dhcp_server;
+        v = s && !sd_dhcp_server_is_in_relay_mode(s) ? s->pool_size : UINT32_MAX;
+
+        return sd_bus_message_append_basic(reply, 'u', &v);
+}
+
+static int property_get_pool_offset(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+        Link *l = ASSERT_PTR(userdata);
+        sd_dhcp_server *s;
+        uint32_t v;
+
+        assert(reply);
+
+        s = l->dhcp_server;
+        v = s && !sd_dhcp_server_is_in_relay_mode(s) ? s->pool_offset : UINT32_MAX;
+
+        return sd_bus_message_append_basic(reply, 'u', &v);
+}
+
 static int dhcp_server_emit_changed_strv(Link *link, char **properties) {
         _cleanup_free_ char *path = NULL;
 
@@ -104,6 +144,8 @@ static const sd_bus_vtable dhcp_server_vtable[] = {
         SD_BUS_VTABLE_START(0),
 
         SD_BUS_PROPERTY("Leases", "a(uayayayayt)", property_get_leases, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+        SD_BUS_PROPERTY("PoolSize", "u", property_get_pool_size, 0, SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("PoolOffset", "u", property_get_pool_offset, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 
         SD_BUS_VTABLE_END
 };