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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* 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.
* 3. Neither the name of Hyra 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 OWNER 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/sysctl.h>
#include <sys/syscall.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <vm/dynalloc.h>
#include <string.h>
#define HYRA_RELEASE "Hyra/" HYRA_ARCH " " \
HYRA_VERSION " " \
HYRA_BUILDDATE
static const char *hyra = "Hyra";
static const char *hyra_version = HYRA_VERSION;
static const char *osrelease = HYRA_RELEASE;
static struct sysctl_entry common_kerntab[] = {
[KERN_OSTYPE] = { KERN_OSTYPE, SYSCTL_OPTYPE_STR_RO, &hyra },
[KERN_OSRELEASE] = { KERN_OSRELEASE, SYSCTL_OPTYPE_STR_RO, &osrelease },
[KERN_VERSION] = { KERN_VERSION, SYSCTL_OPTYPE_STR_RO, &hyra_version },
};
/*
* Helper for sys_sysctl()
*/
static int
do_sysctl(struct sysctl_args *args)
{
struct sysctl_args new_args;
size_t name_len, oldlenp;
int *name = NULL;
void *oldp = NULL, *newp = NULL;
int retval = 0;
if (args->oldlenp == NULL) {
return -EINVAL;
}
name_len = args->nlen;
retval = copyin(args->oldlenp, &oldlenp, sizeof(oldlenp));
if (retval != 0) {
goto done;
}
/* Copy in newp if it is set */
if (args->newp == NULL) {
newp = NULL;
} else {
newp = dynalloc(args->newlen);
retval = copyin(args->newp, newp, args->newlen);
}
if (retval != 0) {
goto done;
}
name = dynalloc(name_len * sizeof(int));
retval = copyin(args->name, name, name_len * sizeof(int));
if (retval != 0) {
return retval;
}
oldp = dynalloc(oldlenp);
retval = copyin(args->oldp, oldp, oldlenp);
if (retval != 0) {
return retval;
}
/* Prepare the arguments for the sysctl call */
new_args.name = name;
new_args.nlen = name_len;
new_args.oldp = oldp;
new_args.oldlenp = &oldlenp;
new_args.newp = newp;
retval = sysctl(&new_args);
if (retval != 0) {
goto done;
}
copyout(oldp, args->oldp, oldlenp);
done:
if (name != NULL)
dynfree(name);
if (newp != NULL)
dynfree(newp);
if (oldp != NULL)
dynfree(oldp);
return retval;
}
int
sysctl(struct sysctl_args *args)
{
struct sysctl_entry *tmp;
char *tmp_str;
size_t oldlen, len;
if (args->name == NULL) {
return -EINVAL;
}
if (args->oldlenp == NULL) {
return -EINVAL;
}
/* TODO: Support writable values */
if (args->newp != NULL) {
return -ENOTSUP;
}
/*
* TODO: We only support toplevel names as of now and should
* expand this in the future. As of now, users will only
* be able to access kern.* entries.
*/
switch (*args->name) {
case KERN_OSTYPE:
tmp = &common_kerntab[KERN_OSTYPE];
tmp_str = *((char **)tmp->data);
len = strlen(tmp_str);
break;
case KERN_OSRELEASE:
tmp = &common_kerntab[KERN_OSRELEASE];
tmp_str = *((char **)tmp->data);
len = strlen(tmp_str);
break;
case KERN_VERSION:
tmp = &common_kerntab[KERN_VERSION];
tmp_str = *((char **)tmp->data);
len = strlen(tmp_str);
break;
default:
return -EINVAL;
}
/* Copy new data */
oldlen = *args->oldlenp;
memcpy(args->oldp, tmp_str, oldlen);
return (len > oldlen) ? -ENOMEM : 0;
}
scret_t
sys_sysctl(struct syscall_args *scargs)
{
struct sysctl_args args;
int error;
error = copyin((void *)scargs->arg0, &args, sizeof(args));
if (error != 0) {
return error;
}
return do_sysctl(&args);
}
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