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Kernel environment access, preloaded module lookup.

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This commit is contained in:
Mike Smith 1998-10-09 00:31:29 +00:00
parent d7a5acb5ec
commit 6ba9413b55
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=40090
2 changed files with 270 additions and 0 deletions
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126
sys/kern/kern_environment.c Normal file
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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.
*
* $Id$
/*
* 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>
#include <machine/bootinfo.h>
char *kern_envp;
static char *kernenv_next(char *cp);
static void
kernenv_init(void* arg)
{
if (bootinfo.bi_envp != 0)
kern_envp = (char *)bootinfo.bi_envp;
}
SYSINIT(kernenv, SI_SUB_CONSOLE, SI_ORDER_FIRST, kernenv_init, 0);
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);
}
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);
}

144
sys/kern/subr_module.c Normal file
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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.
*
* $Id$
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/linker.h>
/*
* Preloaded module support
*/
caddr_t module_metadata;
/*
* Search for the preloaded module (name)
*/
caddr_t
module_search_by_name(const char *name)
{
caddr_t curp;
u_int32_t *hdr;
if (module_metadata != NULL) {
curp = module_metadata;
for (;;) {
hdr = (u_int32_t *)curp;
if (hdr[0] == 0)
break;
/* Search for a MODINFO_NAME field */
if ((hdr[0] == MODINFO_NAME) &&
!strcmp(name, curp + sizeof(u_int32_t) * 2))
return(curp);
/* skip to next field */
curp += sizeof(u_int32_t) * 2 + hdr[1];
}
}
return(NULL);
}
/*
* Search for the first preloaded module of (type)
*/
caddr_t
module_search_by_type(const char *type)
{
caddr_t curp, lname;
u_int32_t *hdr;
if (module_metadata != NULL) {
curp = module_metadata;
lname = NULL;
for (;;) {
hdr = (u_int32_t *)curp;
if (hdr[0] == 0)
break;
/* remember the start of each record */
if (hdr[0] == MODINFO_NAME)
lname = curp;
/* Search for a MODINFO_TYPE field */
if ((hdr[0] == MODINFO_TYPE) &&
!strcmp(type, curp + sizeof(u_int32_t) * 2))
return(lname);
/* skip to next field */
curp += sizeof(u_int32_t) * 2 + hdr[1];
}
}
return(NULL);
}
/*
* Given a preloaded module handle (mod), return a pointer
* to the data for the attribute (inf).
*/
caddr_t
module_search_info(caddr_t mod, int inf)
{
caddr_t curp;
u_int32_t *hdr;
u_int32_t type = 0;
curp = mod;
for (;;) {
hdr = (u_int32_t *)curp;
/* end of module data? */
if (hdr[0] == 0)
break;
/*
* We give up once we've looped back to what we were looking at
* first - this should normally be a MODINFO_NAME field.
*/
if (type == 0) {
type = hdr[0];
} else {
if (hdr[0] == type)
break;
}
/*
* Attribute match? Return pointer to data.
* Consumer may safely assume that size value preceeds
* data.
*/
if (hdr[0] == inf)
return(curp + (sizeof(u_int32_t) * 2));
/* skip to next field */
curp += sizeof(u_int32_t) * 2 + hdr[1];
}
return(NULL);
}