network: implement ListLinks DBus method

src/network/networkd-manager-bus.c

@@ -3,10 +3,50 @@
 #include "alloc-util.h"
 #include "bus-util.h"
 #include "networkd-link-bus.h"
+#include "networkd-link.h"
 #include "networkd-manager-bus.h"
 #include "networkd-manager.h"
+#include "path-util.h"
 #include "strv.h"
 
+static int method_list_links(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+        Manager *manager = userdata;
+        Iterator i;
+        Link *link;
+        int r;
+
+        r = sd_bus_message_new_method_return(message, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_open_container(reply, 'a', "(iso)");
+        if (r < 0)
+                return r;
+
+        HASHMAP_FOREACH(link, manager->links, i) {
+                _cleanup_free_ char *path = NULL;
+
+                path = link_bus_path(link);
+                if (!path)
+                        return -ENOMEM;
+
+                r = sd_bus_message_append(
+                        reply, "(iso)",
+                        link->ifindex,
+                        link->ifname,
+                        empty_to_root(path));
+                if (r < 0)
+                        return r;
+        }
+
+        r = sd_bus_message_close_container(reply);
+        if (r < 0)
+                return r;
+
+        return sd_bus_send(NULL, reply, NULL);
+}
+
 const sd_bus_vtable manager_vtable[] = {
         SD_BUS_VTABLE_START(0),
 
@@ -14,6 +54,8 @@ const sd_bus_vtable manager_vtable[] = {
         SD_BUS_PROPERTY("CarrierState", "s", property_get_carrier_state, offsetof(Manager, carrier_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         SD_BUS_PROPERTY("AddressState", "s", property_get_address_state, offsetof(Manager, address_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 
+        SD_BUS_METHOD("ListLinks", NULL, "a(iso)", method_list_links, SD_BUS_VTABLE_UNPRIVILEGED),
+
         SD_BUS_VTABLE_END
 };
 

src/network/org.freedesktop.network1.conf

@@ -36,6 +36,10 @@
                        send_interface="org.freedesktop.DBus.Properties"
                        send_member="GetAll"/>
 
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.network1.Manager"
+                       send_member="ListLinks"/>
+
                 <allow receive_sender="org.freedesktop.network1"/>
         </policy>