network: introduce Describe() method for manager and links

1 files changed, 135 insertions, 0 deletions

diff --git a/src/network/networkd-json.c b/src/network/networkd-json.c
new file mode 100644
index 0000000000..7a7fc24ea6
--- /dev/null
+++ b/src/network/networkd-json.c
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "network-util.h"
+#include "networkd-json.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+#include "networkd-network.h"
+#include "sort-util.h"
+
+static int network_build_json(Network *network, JsonVariant **ret) {
+        assert(network);
+        assert(ret);
+
+        return json_build(ret, JSON_BUILD_OBJECT(
+                                        JSON_BUILD_PAIR("NetworkFile", JSON_BUILD_STRING(network->filename))));
+}
+
+static int device_build_json(sd_device *device, JsonVariant **ret) {
+        const char *link = NULL, *path = NULL, *vendor = NULL, *model = NULL;
+
+        assert(device);
+        assert(ret);
+
+        (void) sd_device_get_property_value(device, "ID_NET_LINK_FILE", &link);
+        (void) sd_device_get_property_value(device, "ID_PATH", &path);
+
+        if (sd_device_get_property_value(device, "ID_VENDOR_FROM_DATABASE", &vendor) < 0)
+                (void) sd_device_get_property_value(device, "ID_VENDOR", &vendor);
+
+        if (sd_device_get_property_value(device, "ID_MODEL_FROM_DATABASE", &model) < 0)
+                (void) sd_device_get_property_value(device, "ID_MODEL", &model);
+
+        return json_build(ret, JSON_BUILD_OBJECT(
+                                        JSON_BUILD_PAIR("LinkFile", JSON_BUILD_STRING(link)),
+                                        JSON_BUILD_PAIR("Path", JSON_BUILD_STRING(path)),
+                                        JSON_BUILD_PAIR("Vendor", JSON_BUILD_STRING(vendor)),
+                                        JSON_BUILD_PAIR("Model", JSON_BUILD_STRING(model))));
+}
+
+int link_build_json(Link *link, JsonVariant **ret) {
+        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+        _cleanup_free_ char *type = NULL;
+        int r;
+
+        assert(link);
+        assert(ret);
+
+        r = link_get_type_string(link->sd_device, link->iftype, &type);
+        if (r == -ENOMEM)
+                return r;
+
+        r = json_build(&v, JSON_BUILD_OBJECT(
+                                        JSON_BUILD_PAIR("Index", JSON_BUILD_INTEGER(link->ifindex)),
+                                        JSON_BUILD_PAIR("Name", JSON_BUILD_STRING(link->ifname)),
+                                        JSON_BUILD_PAIR("AlternativeNames", JSON_BUILD_STRV(link->alternative_names)),
+                                        JSON_BUILD_PAIR("Type", JSON_BUILD_STRING(type)),
+                                        JSON_BUILD_PAIR("Driver", JSON_BUILD_STRING(link->driver)),
+                                        JSON_BUILD_PAIR("SetupState", JSON_BUILD_STRING(link_state_to_string(link->state))),
+                                        JSON_BUILD_PAIR("OperationalState", JSON_BUILD_STRING(link_operstate_to_string(link->operstate))),
+                                        JSON_BUILD_PAIR("CarrierState", JSON_BUILD_STRING(link_carrier_state_to_string(link->carrier_state))),
+                                        JSON_BUILD_PAIR("AddressState", JSON_BUILD_STRING(link_address_state_to_string(link->address_state))),
+                                        JSON_BUILD_PAIR("IPv4AddressState", JSON_BUILD_STRING(link_address_state_to_string(link->ipv4_address_state))),
+                                        JSON_BUILD_PAIR("IPv6AddressState", JSON_BUILD_STRING(link_address_state_to_string(link->ipv6_address_state)))));
+        if (r < 0)
+                return r;
+
+        if (link->network) {
+                _cleanup_(json_variant_unrefp) JsonVariant *w = NULL;
+
+                r = network_build_json(link->network, &w);
+                if (r < 0)
+                        return r;
+
+                r = json_variant_merge(&v, w);
+                if (r < 0)
+                        return r;
+        }
+
+        if (link->sd_device) {
+                _cleanup_(json_variant_unrefp) JsonVariant *w = NULL;
+
+                r = device_build_json(link->sd_device, &w);
+                if (r < 0)
+                        return r;
+
+                r = json_variant_merge(&v, w);
+                if (r < 0)
+                        return r;
+        }
+
+        *ret = TAKE_PTR(v);
+        return 0;
+}
+
+static int link_json_compare(JsonVariant * const *a, JsonVariant * const *b) {
+        intmax_t index_a, index_b;
+
+        assert(a && *a);
+        assert(b && *b);
+
+        index_a = json_variant_integer(json_variant_by_key(*a, "Index"));
+        index_b = json_variant_integer(json_variant_by_key(*b, "Index"));
+
+        return CMP(index_a, index_b);
+}
+
+int manager_build_json(Manager *manager, JsonVariant **ret) {
+        JsonVariant **elements;
+        Link *link;
+        size_t n = 0;
+        int r;
+
+        assert(manager);
+        assert(ret);
+
+        elements = new(JsonVariant*, hashmap_size(manager->links));
+        if (!elements)
+                return -ENOMEM;
+
+        HASHMAP_FOREACH(link, manager->links) {
+                r = link_build_json(link, elements + n);
+                if (r < 0)
+                        goto finalize;
+                n++;
+        }
+
+        typesafe_qsort(elements, n, link_json_compare);
+
+        r = json_build(ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("Interfaces", JSON_BUILD_VARIANT_ARRAY(elements, n))));
+
+finalize:
+        json_variant_unref_many(elements, n);
+        free(elements);
+        return r;
+}