network: introduce GetLinkByName and GetLinkByIndex bus methods

2 files changed, 79 insertions, 0 deletions

diff --git a/src/network/networkd-manager-bus.c b/src/network/networkd-manager-bus.c
index b52e3f7dd6..6174104f5e 100644
--- a/src/network/networkd-manager-bus.c
+++ b/src/network/networkd-manager-bus.c
@@ -1,6 +1,9 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
+#include <net/if.h>
+
 #include "alloc-util.h"
+#include "bus-common-errors.h"
 #include "bus-util.h"
 #include "networkd-link-bus.h"
 #include "networkd-link.h"
@@ -47,6 +50,72 @@ static int method_list_links(sd_bus_message *message, void *userdata, sd_bus_err
         return sd_bus_send(NULL, reply, NULL);
 }
 
+static int method_get_link_by_name(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+        _cleanup_free_ char *path = NULL;
+        Manager *manager = userdata;
+        const char *name;
+        int index, r;
+        Link *link;
+
+        r = sd_bus_message_read(message, "s", &name);
+        if (r < 0)
+                return r;
+
+        index = if_nametoindex(name);
+        if (index <= 0)
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %s not known", name);
+
+        link = hashmap_get(manager->links, INT_TO_PTR(index));
+        if (!link)
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %s not known", name);
+
+        r = sd_bus_message_new_method_return(message, &reply);
+        if (r < 0)
+                return r;
+
+        path = link_bus_path(link);
+        if (!path)
+                return -ENOMEM;
+
+        r = sd_bus_message_append(reply, "io", link->ifindex, empty_to_root(path));
+        if (r < 0)
+                return r;
+
+        return sd_bus_send(NULL, reply, NULL);
+}
+
+static int method_get_link_by_index(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+        _cleanup_free_ char *path = NULL;
+        Manager *manager = userdata;
+        int32_t index;
+        Link *link;
+        int r;
+
+        r = sd_bus_message_read(message, "i", &index);
+        if (r < 0)
+                return r;
+
+        link = hashmap_get(manager->links, INT_TO_PTR((int) index));
+        if (!link)
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_LINK, "Link %" PRIi32 " not known", index);
+
+        r = sd_bus_message_new_method_return(message, &reply);
+        if (r < 0)
+                return r;
+
+        path = link_bus_path(link);
+        if (!path)
+                return -ENOMEM;
+
+        r = sd_bus_message_append(reply, "so", link->ifname, empty_to_root(path));
+        if (r < 0)
+                return r;
+
+        return sd_bus_send(NULL, reply, NULL);
+}
+
 const sd_bus_vtable manager_vtable[] = {
         SD_BUS_VTABLE_START(0),
 
@@ -55,6 +124,8 @@ const sd_bus_vtable manager_vtable[] = {
         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_METHOD("GetLinkByName", "s", "io", method_get_link_by_name, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("GetLinkByIndex", "i", "so", method_get_link_by_index, SD_BUS_VTABLE_UNPRIVILEGED),
 
         SD_BUS_VTABLE_END
 };
diff --git a/src/network/org.freedesktop.network1.conf b/src/network/org.freedesktop.network1.conf
index 279da06a98..56a78ee7dc 100644
--- a/src/network/org.freedesktop.network1.conf
+++ b/src/network/org.freedesktop.network1.conf
@@ -40,6 +40,14 @@
                        send_interface="org.freedesktop.network1.Manager"
                        send_member="ListLinks"/>
 
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.network1.Manager"
+                       send_member="GetLinkByName"/>
+
+                <allow send_destination="org.freedesktop.network1"
+                       send_interface="org.freedesktop.network1.Manager"
+                       send_member="GetLinkByIndex"/>
+
                 <allow receive_sender="org.freedesktop.network1"/>
         </policy>