/*
 * mgmt-keywrap.c
 * --------------
 * CLI functions to manage the keywrap core
 *
 * Copyright (c) 2019, NORDUnet A/S All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the NORDUnet nor the names of its contributors may
 *   be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define HAL_OK CMSIS_HAL_OK
#include "stm-init.h"
#include "mgmt-cli.h"
#include "mgmt-keywrap.h"
#undef HAL_OK

#define HAL_OK LIBHAL_OK
#include "hal.h"
#include "hal_internal.h"
#undef HAL_OK

#include <stdlib.h>
#include <string.h>

static int cmd_keywrap_core(struct cli_def *cli, const char *command, char *argv[], int argc)
{
    if (argc == 1) {
        int onoff = -1;
        if (strcmp(argv[0], "on") == 0)
            onoff = 1;
        else if (strcmp(argv[0], "off") == 0)
            onoff = 0;
        if (onoff >= 0) {
            int ret = hal_aes_use_keywrap_core(onoff);
            if (ret)
                cli_print(cli, "keywrap core enabled");
            else if (onoff)
                cli_print(cli, "keywrap core not found");
            else
                cli_print(cli, "keywrap core disabled");
            return CLI_OK;
        }
    }

    cli_print(cli, "Syntax: %s <on|off>", command);
    return CLI_ERROR;
}

static int cmd_keywrap_stats_show(struct cli_def *cli, const char *command, char *argv[], int argc)
{
    command = command;
    argv = argv;
    argc = argc;

    unsigned load, skip;
    hal_error_t err;

    if ((err = hal_aes_keywrap_get_stats(&load, &skip)) != LIBHAL_OK) {
        cli_print(cli, "Error getting stats: %s", hal_error_string(err));
        return CLI_ERROR;
    }

    cli_print(cli, "loaded %u, skipped %u", load, skip);

    return CLI_OK;
}

static int cmd_keywrap_stats_reset(struct cli_def *cli, const char *command, char *argv[], int argc)
{
    cli = cli;
    command = command;
    argv = argv;
    argc = argc;

    hal_aes_keywrap_reset_stats();

    return CLI_OK;
}

static int cmd_keywrap_zero(struct cli_def *cli, const char *command, char *argv[], int argc)
{
    command = command;
    argv = argv;
    argc = argc;

    hal_error_t err;

    if ((err = hal_aes_keywrap_zero(NULL)) != LIBHAL_OK) {
        cli_print(cli, "Error zeroing KEK: %s", hal_error_string(err));
        return CLI_ERROR;
    }

    return CLI_OK;
}

static int cmd_keywrap_timeout(struct cli_def *cli, const char *command, char *argv[], int argc)
{
    if (argc != 1) {
    errout:
        cli_print(cli, "Syntax: %s <cycle count>", command);
        return CLI_ERROR;
    }

    char *endptr;
    unsigned long n = strtoul(argv[0], &endptr, 0);
    if (n == 0 && endptr == argv[0])
        /* no valid digits */
        goto errout;

    hal_error_t err;

    if ((err = hal_aes_keywrap_set_timeout(NULL, n)) != LIBHAL_OK) {
        cli_print(cli, "Error setting KEK timeout: %s", hal_error_string(err));
        return CLI_ERROR;
    }

    return CLI_OK;
}

void configure_cli_keywrap(struct cli_def *cli)
{
    struct cli_command *c_keywrap = cli_register_command(cli, NULL, "keywrap", NULL, 0, 0, NULL);

    /* keywrap core */
    cli_register_command(cli, c_keywrap, "core", cmd_keywrap_core, 0, 0, "Toggle use of the keywrap core");

    struct cli_command *c_stats = cli_register_command(cli, c_keywrap, "stats", NULL, 0, 0, NULL);

    /* keywrap stats show */
    cli_register_command(cli, c_stats, "show", cmd_keywrap_stats_show, 0, 0, "Show the keywrap KEK stats");

    /* keywrap stats reset */
    cli_register_command(cli, c_stats, "reset", cmd_keywrap_stats_reset, 0, 0, "Reset the keywrap KEK stats");

    /* keywrap zero */
    cli_register_command(cli, c_keywrap, "zero", cmd_keywrap_zero, 0, 0, "Zero the KEK in the keywrap core");

    /* keywrap timeout */
    cli_register_command(cli, c_keywrap, "timeout", cmd_keywrap_timeout, 0, 0, "Set the KEK timeout in the keywrap core");
}