/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2006 - 2008 Novell, Inc.
 * Copyright (C) 2008 - 2014 Red Hat, Inc.
 */

/*
 * nm-online.c - Are we online?
 *
 * Return values:
 *
 * 0: already online or connection established within given timeout
 * 1: offline or not online within given timeout
 * 2: unspecified error
 *
 * Robert Love <rml@novell.com>
 */

#include "libnm-client-aux-extern/nm-default-client.h"

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <locale.h>

#include "libnm-client-aux-extern/nm-libnm-aux.h"

#define PROGRESS_STEPS 15

#define EXIT_NONE                -1
#define EXIT_FAILURE_OFFLINE     1
#define EXIT_FAILURE_ERROR       2
#define EXIT_FAILURE_LIBNM_BUG   42
#define EXIT_FAILURE_UNSPECIFIED 43

typedef struct {
    GMainLoop    *loop;
    NMClient     *client;
    GCancellable *client_new_cancellable;
    guint         client_new_timeout_id;
    guint         handle_timeout_id;
    gulong        client_notify_id;
    gboolean      exit_no_nm;
    gboolean      wait_startup;
    gboolean      quiet;
    gint64        start_timestamp_ms;
    gint64        end_timestamp_ms;
    gint64        progress_step_duration;
    int           retval;
} OnlineData;

static gint64
_now_ms(void)
{
    return g_get_monotonic_time() / (G_USEC_PER_SEC / 1000);
}

static void
_return(OnlineData *data, int retval)
{
    nm_assert(data);
    nm_assert(data->retval == EXIT_FAILURE_UNSPECIFIED);

    data->retval = retval;
    nm_clear_g_signal_handler(data->client, &data->client_notify_id);
    g_main_loop_quit(data->loop);
}

static void
_print_progress(gboolean wait_startup, int progress_next_step_i, gint64 remaining_ms, int retval)
{
    int i, j;

    j = progress_next_step_i < 0 ? PROGRESS_STEPS : progress_next_step_i;

    g_print("\r%s", _("Connecting"));
    for (i = 0; i < PROGRESS_STEPS; i++)
        putchar(i < j ? '.' : ' ');
    g_print(" %4lds", (long) (MAX(0, remaining_ms + 999) / 1000));
    if (retval != EXIT_NONE) {
        const char *result;

        if (wait_startup) {
            if (retval == EXIT_SUCCESS)
                result = "started";
            else if (retval == EXIT_FAILURE_OFFLINE)
                result = "startup-pending";
            else
                result = "failure";
        } else {
            if (retval == EXIT_SUCCESS)
                result = "online";
            else
                result = "offline";
        }

        g_print(" [%s]\n", result);
    }
    fflush(stdout);
}

static gboolean
quit_if_connected(OnlineData *data)
{
    NMState state;

    state = nm_client_get_state(data->client);
    if (!nm_client_get_nm_running(data->client)) {
        if (data->exit_no_nm) {
            _return(data, EXIT_FAILURE_OFFLINE);
            return TRUE;
        }
    } else if (data->wait_startup) {
        if (!nm_client_get_startup(data->client)) {
            _return(data, EXIT_SUCCESS);
            return TRUE;
        }
    } else {
        if (state == NM_STATE_CONNECTED_LOCAL || state == NM_STATE_CONNECTED_SITE
            || state == NM_STATE_CONNECTED_GLOBAL) {
            _return(data, EXIT_SUCCESS);
            return TRUE;
        }
    }
    if (data->exit_no_nm && (state != NM_STATE_CONNECTING)) {
        _return(data, EXIT_FAILURE_OFFLINE);
        return TRUE;
    }

    return FALSE;
}

static void
client_properties_changed(GObject *object, GParamSpec *pspec, gpointer user_data)
{
    quit_if_connected(user_data);
}

static gboolean
handle_timeout(gpointer user_data)
{
    OnlineData  *data                 = user_data;
    const gint64 now                  = _now_ms();
    gint64       remaining_ms         = data->end_timestamp_ms - now;
    const gint64 elapsed_ms           = now - data->start_timestamp_ms;
    int          progress_next_step_i = 0;

    data->handle_timeout_id = 0;

    if (remaining_ms <= 3) {
        _return(data, EXIT_FAILURE_OFFLINE);
        return G_SOURCE_REMOVE;
    }

    if (!data->quiet) {
        gint64 rem;

        /* calculate the next step (not the current): floor()+1 */
        progress_next_step_i =
            NM_MIN((elapsed_ms / data->progress_step_duration) + 1, PROGRESS_STEPS);
        _print_progress(data->wait_startup, progress_next_step_i, remaining_ms, EXIT_NONE);

        /* synchronize the timeout with the ticking of the seconds. */
        rem = remaining_ms % 1000;
        if (rem <= 3)
            rem = rem + G_USEC_PER_SEC;
        /* add small offset to awake a bit after the second ticks */
        remaining_ms = NM_MIN(remaining_ms, rem + 10);

        /* synchronize the timeout with the steps of the progress bar. */
        rem = (progress_next_step_i * data->progress_step_duration) - elapsed_ms;
        if (rem <= 3)
            rem = rem + data->progress_step_duration;
        /* add small offset to awake a bit after the second ticks */
        remaining_ms = NM_MIN(remaining_ms, rem + 10);
    }

    data->handle_timeout_id = g_timeout_add(remaining_ms, handle_timeout, data);
    return G_SOURCE_REMOVE;
}

static gboolean
got_client_timeout(gpointer user_data)
{
    OnlineData *data = user_data;

    data->client_new_timeout_id = 0;
    data->quiet                 = TRUE;
    g_printerr(_("Error: timeout creating NMClient object\n"));
    _return(data, EXIT_FAILURE_LIBNM_BUG);
    return G_SOURCE_REMOVE;
}

static void
got_client(GObject *source_object, GAsyncResult *res, gpointer user_data)
{
    OnlineData           *data  = user_data;
    gs_free_error GError *error = NULL;

    nm_assert(NM_IS_CLIENT(source_object));
    nm_assert(NM_CLIENT(source_object) == data->client);

    nm_clear_g_source(&data->client_new_timeout_id);
    g_clear_object(&data->client_new_cancellable);

    if (!g_async_initable_init_finish(G_ASYNC_INITABLE(source_object), res, &error)) {
        if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
            return;
        data->quiet = TRUE;
        g_printerr(_("Error: Could not create NMClient object: %s\n"), error->message);
        _return(data, EXIT_FAILURE_ERROR);
        return;
    }

    if (quit_if_connected(data))
        return;

    data->client_notify_id =
        g_signal_connect(data->client, "notify", G_CALLBACK(client_properties_changed), data);
    data->handle_timeout_id =
        g_timeout_add(data->quiet ? NM_MAX(0, data->end_timestamp_ms - _now_ms()) : 0,
                      handle_timeout,
                      data);
}

int
main(int argc, char *argv[])
{
    OnlineData data = {
        .retval = EXIT_FAILURE_UNSPECIFIED,
    };
    int             t_secs;
    GOptionContext *opt_ctx = NULL;
    gboolean        success;
    GOptionEntry    options[] = {
        {"quiet", 'q', 0, G_OPTION_ARG_NONE, &data.quiet, N_("Don't print anything"), NULL},
        {"wait-for-startup",
            's',
            0,
            G_OPTION_ARG_NONE,
            &data.wait_startup,
            N_("Wait for NetworkManager startup instead of a connection"),
            NULL},
        {"timeout",
            't',
            0,
            G_OPTION_ARG_INT,
            &t_secs,
            N_("Time to wait for a connection, in seconds (without the option, default value is 30). "
               "Maximum value is 2073600 seconds."),
            "<timeout>"},
        {"exit",
            'x',
            0,
            G_OPTION_ARG_NONE,
            &data.exit_no_nm,
            N_("Exit immediately if NetworkManager is not running or connecting"),
            NULL},
        {NULL},
    };

    /* Set locale to be able to use environment variables */
    setlocale(LC_ALL, "");

    bindtextdomain(GETTEXT_PACKAGE, NMLOCALEDIR);
    bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
    textdomain(GETTEXT_PACKAGE);

    t_secs = _nm_utils_ascii_str_to_int64(g_getenv("NM_ONLINE_TIMEOUT"), 10, 0, G_MAXINT, 30);

    data.start_timestamp_ms = _now_ms();

    opt_ctx = g_option_context_new(NULL);
    g_option_context_set_translation_domain(opt_ctx, GETTEXT_PACKAGE);
    g_option_context_set_ignore_unknown_options(opt_ctx, FALSE);
    g_option_context_set_help_enabled(opt_ctx, TRUE);
    g_option_context_add_main_entries(opt_ctx, options, NULL);

    g_option_context_set_summary(
        opt_ctx,
        _("Waits for NetworkManager to finish activating startup network connections."));

    success = g_option_context_parse(opt_ctx, &argc, &argv, NULL);
    g_option_context_free(opt_ctx);

    if (!success) {
        g_printerr("%s: %s\n",
                   argv[0],
                   _("Invalid option.  Please use --help to see a list of valid options."));
        return EXIT_FAILURE_ERROR;
    }

    if (t_secs < 0 || t_secs > 2073600) {
        g_printerr("%s: %s\n",
                   argv[0],
                   _("Invalid option.  Please use --help to see a list of valid options."));
        return EXIT_FAILURE_ERROR;
    }

    if (t_secs == 0)
        data.quiet = TRUE;

    data.loop = g_main_loop_new(NULL, FALSE);

    data.end_timestamp_ms       = data.start_timestamp_ms + (t_secs * 1000);
    data.progress_step_duration = NM_MAX(
        1,
        (data.end_timestamp_ms - data.start_timestamp_ms + PROGRESS_STEPS / 2) / PROGRESS_STEPS);

    data.client_new_cancellable = g_cancellable_new();

    data.client_new_timeout_id = g_timeout_add_seconds(30, got_client_timeout, &data);

    data.client = nmc_client_new_async(data.client_new_cancellable,
                                       got_client,
                                       &data,
                                       NM_CLIENT_INSTANCE_FLAGS,
                                       (guint) NM_CLIENT_INSTANCE_FLAGS_NO_AUTO_FETCH_PERMISSIONS,
                                       NULL);

    g_main_loop_run(data.loop);

    nm_clear_g_cancellable(&data.client_new_cancellable);
    nm_clear_g_source(&data.client_new_timeout_id);
    nm_clear_g_source(&data.handle_timeout_id);
    nm_clear_g_signal_handler(data.client, &data.client_notify_id);
    g_clear_object(&data.client);

    nm_clear_pointer(&data.loop, g_main_loop_unref);

    if (!data.quiet)
        _print_progress(data.wait_startup,
                        -1,
                        NM_MAX(0, data.end_timestamp_ms - _now_ms()),
                        data.retval);

    return data.retval;
}
