/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include "alloc-util.h"
#include "device-private.h"
#include "device-util.h"
#include "errno-util.h"
#include "link-config.h"
#include "log.h"
#include "string-util.h"
#include "strv.h"
#include "udev-builtin.h"

static LinkConfigContext *ctx = NULL;

static int builtin_net_setup_link(UdevEvent *event, int argc, char **argv) {
        sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
        _cleanup_(link_freep) Link *link = NULL;
        int r;

        if (argc > 1)
                return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), "This program takes no arguments.");

        sd_device_action_t action;
        r = sd_device_get_action(dev, &action);
        if (r < 0)
                return log_device_error_errno(dev, r, "Failed to get action: %m");

        if (!IN_SET(action, SD_DEVICE_ADD, SD_DEVICE_BIND, SD_DEVICE_MOVE)) {
                log_device_debug(dev, "Not applying .link settings on '%s' uevent.",
                                 device_action_to_string(action));

                /* Import previously assigned .link file name. */
                (void) udev_builtin_import_property(dev, event->dev_db_clone, event->event_mode, "ID_NET_LINK_FILE");
                (void) udev_builtin_import_property(dev, event->dev_db_clone, event->event_mode, "ID_NET_LINK_FILE_DROPINS");

                /* Set ID_NET_NAME= with the current interface name. */
                const char *value;
                if (sd_device_get_sysname(dev, &value) >= 0)
                        (void) udev_builtin_add_property(dev, event->event_mode, "ID_NET_NAME", value);

                return 0;
        }

        r = link_new(ctx, &event->rtnl, dev, event->dev_db_clone, &link);
        if (r == -ENODEV) {
                log_device_debug_errno(dev, r, "Link vanished while getting information, ignoring.");
                return 0;
        }
        if (r < 0)
                return log_device_warning_errno(dev, r, "Failed to get link information: %m");

        r = link_get_config(ctx, link);
        if (r < 0) {
                if (r == -ENOENT) {
                        log_device_debug_errno(dev, r, "No matching link configuration found, ignoring device.");
                        return 0;
                }

                return log_device_error_errno(dev, r, "Failed to get link config: %m");
        }

        r = link_apply_config(ctx, &event->rtnl, link, event->event_mode);
        if (r == -ENODEV)
                log_device_debug_errno(dev, r, "Link vanished while applying configuration, ignoring.");
        else if (r < 0)
                log_device_warning_errno(dev, r, "Could not apply link configuration, ignoring: %m");

        event->altnames = TAKE_PTR(link->altnames);

        return 0;
}

static int builtin_net_setup_link_init(void) {
        int r;

        if (ctx)
                return 0;

        r = link_config_ctx_new(&ctx);
        if (r < 0)
                return r;

        r = link_config_load(ctx);
        if (r < 0)
                return r;

        log_debug("Created link configuration context.");
        return 0;
}

static void builtin_net_setup_link_exit(void) {
        ctx = link_config_ctx_free(ctx);
        log_debug("Unloaded link configuration context.");
}

static bool builtin_net_setup_link_should_reload(void) {
        if (!ctx)
                return false;

        if (link_config_should_reload(ctx)) {
                log_debug("Link configuration context needs reloading.");
                return true;
        }

        return false;
}

const UdevBuiltin udev_builtin_net_setup_link = {
        .name = "net_setup_link",
        .cmd = builtin_net_setup_link,
        .init = builtin_net_setup_link_init,
        .exit = builtin_net_setup_link_exit,
        .should_reload = builtin_net_setup_link_should_reload,
        .help = "Configure network link",
        .run_once = false,
};