/*      $NetBSD: k_helper.c,v 1.7 2020/02/22 19:54:35 pgoyette Exp $    */
/*
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: k_helper.c,v 1.7 2020/02/22 19:54:35 pgoyette Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/evcnt.h>

#include <prop/proplib.h>

MODULE(MODULE_CLASS_MISC, k_helper, NULL);

/* --------------------------------------------------------------------- */
/* Sysctl interface to query information about the module.               */
/* --------------------------------------------------------------------- */

/* TODO: Change the integer variables below that represent booleans to
* bools, once sysctl(8) supports CTLTYPE_BOOL nodes. */

static int present = 1;
static int prop_str_ok;
static char prop_str_val[128];
static int prop_int_ok;
static int64_t prop_int_val;
static int prop_int_load;

static struct evcnt my_counter =
   EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "k_helper", "my_counter");

EVCNT_ATTACH_STATIC(my_counter);

#define K_HELPER 0x12345678
#define K_HELPER_PRESENT 0
#define K_HELPER_PROP_STR_OK 1
#define K_HELPER_PROP_STR_VAL 2
#define K_HELPER_PROP_INT_OK 3
#define K_HELPER_PROP_INT_VAL 4
#define K_HELPER_PROP_INT_LOAD 5

SYSCTL_SETUP(sysctl_k_helper_setup, "sysctl k_helper subtree setup")
{

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_NODE, "k_helper", NULL,
                      NULL, 0, NULL, 0,
                      CTL_VENDOR, K_HELPER, CTL_EOL);

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_INT, "present",
                      SYSCTL_DESCR("Whether the module was loaded or not"),
                      NULL, 0, &present, 0,
                      CTL_VENDOR, K_HELPER, K_HELPER_PRESENT, CTL_EOL);

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_INT, "prop_str_ok",
                      SYSCTL_DESCR("String property's validity"),
                      NULL, 0, &prop_str_ok, 0,
                      CTL_VENDOR, K_HELPER, K_HELPER_PROP_STR_OK, CTL_EOL);

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_STRING, "prop_str_val",
                      SYSCTL_DESCR("String property's value"),
                      NULL, 0, prop_str_val, 0,
                      CTL_VENDOR, K_HELPER, K_HELPER_PROP_STR_VAL, CTL_EOL);

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_INT, "prop_int_ok",
                      SYSCTL_DESCR("String property's validity"),
                      NULL, 0, &prop_int_ok, 0,
                      CTL_VENDOR, K_HELPER, K_HELPER_PROP_INT_OK, CTL_EOL);

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_QUAD, "prop_int_val",
                      SYSCTL_DESCR("String property's value"),
                      NULL, 0, &prop_int_val, 0,
                      CTL_VENDOR, K_HELPER, K_HELPER_PROP_INT_VAL, CTL_EOL);

       sysctl_createv(clog, 0, NULL, NULL,
                      CTLFLAG_PERMANENT,
                      CTLTYPE_INT, "prop_int_load",
                      SYSCTL_DESCR("Status of recursive modload"),
                      NULL, 0, &prop_int_load, 0,
                      CTL_VENDOR, K_HELPER, K_HELPER_PROP_INT_LOAD, CTL_EOL);
}

/* --------------------------------------------------------------------- */
/* Module management.                                                    */
/* --------------------------------------------------------------------- */

static
int
k_helper_init(prop_dictionary_t props)
{
       prop_object_t p;

       p = prop_dictionary_get(props, "prop_str");
       if (p == NULL)
               prop_str_ok = 0;
       else if (prop_object_type(p) != PROP_TYPE_STRING)
               prop_str_ok = 0;
       else {
               const char *msg = prop_string_cstring_nocopy(p);
               if (msg == NULL)
                       prop_str_ok = 0;
               else {
                       strlcpy(prop_str_val, msg, sizeof(prop_str_val));
                       prop_str_ok = 1;
               }
       }
       if (!prop_str_ok)
               strlcpy(prop_str_val, "", sizeof(prop_str_val));

       p = prop_dictionary_get(props, "prop_int");
       if (p == NULL)
               prop_int_ok = 0;
       else if (prop_object_type(p) != PROP_TYPE_NUMBER)
               prop_int_ok = 0;
       else {
               prop_int_val = prop_number_integer_value(p);
               prop_int_ok = 1;
       }
       if (!prop_int_ok)
               prop_int_val = -1;

       p = prop_dictionary_get(props, "prop_recurse");
       if (p != NULL && prop_object_type(p) == PROP_TYPE_STRING) {
               const char *recurse_name = prop_string_cstring_nocopy(p);
               if (recurse_name != NULL)
                       prop_int_load = module_load(recurse_name,
                           MODCTL_NO_PROP, NULL, MODULE_CLASS_ANY);
               else
                       prop_int_load = -1;
       } else
               prop_int_load = -2;

       return 0;
}

static
int
k_helper_fini(void *arg)
{

       return 0;
}

static
int
k_helper_modcmd(modcmd_t cmd, void *arg)
{
       int ret;

       switch (cmd) {
       case MODULE_CMD_INIT:
               ret = k_helper_init(arg);
               break;

       case MODULE_CMD_FINI:
               ret = k_helper_fini(arg);
               break;

       case MODULE_CMD_STAT:
       default:
               ret = ENOTTY;
       }

       return ret;
}

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