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/*-
* Copyright (c) 1998 Michael Smith
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* The unified bootloader passes us a pointer to a preserved copy of
* bootstrap/kernel environment variables.
* We make these available using sysctl for both in-kernel and
* out-of-kernel consumers.
*
* Note that the current sysctl infrastructure doesn't allow
* dynamic insertion or traversal through handled spaces. Grr.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/libkern.h>
char *kern_envp;
static char *kernenv_next(char *cp);
char *
getenv(char *name)
{
char *cp, *ep;
int len;
for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
;
len = ep - cp;
if (*ep == '=')
ep++;
if (!strncmp(name, cp, len))
return(ep);
}
return(NULL);
}
/*
* Return an integer value from an environment variable.
*/
int
getenv_int(char *name, int *data)
{
quad_t tmp;
int rval;
rval = getenv_quad(name, &tmp);
if (rval) {
*data = (int) tmp;
}
return (rval);
}
/*
* Return a quad_t value from an environment variable.
*/
quad_t
getenv_quad(char *name, quad_t *data)
{
const char *value;
char *vtp;
quad_t iv;
if ((value = getenv(name)) == NULL)
return(0);
iv = strtoq(value, &vtp, 0);
if ((vtp == value) || (*vtp != '\0'))
return(0);
*data = iv;
return(1);
}
static int
sysctl_kernenv(SYSCTL_HANDLER_ARGS)
{
int *name = (int *)arg1;
u_int namelen = arg2;
char *cp;
int i, error;
if (kern_envp == NULL)
return(ENOENT);
name++;
namelen--;
if (namelen != 1)
return(EINVAL);
cp = kern_envp;
for (i = 0; i < name[0]; i++) {
cp = kernenv_next(cp);
if (cp == NULL)
break;
}
if (cp == NULL)
return(ENOENT);
error = SYSCTL_OUT(req, cp, strlen(cp) + 1);
return (error);
}
SYSCTL_NODE(_kern, OID_AUTO, environment, CTLFLAG_RD, sysctl_kernenv, "kernel environment space");
/*
* Find the next entry after the one which (cp) falls within, return a
* pointer to its start or NULL if there are no more.
*/
static char *
kernenv_next(char *cp)
{
if (cp != NULL) {
while (*cp != 0)
cp++;
cp++;
if (*cp == 0)
cp = NULL;
}
return(cp);
}
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