Kernel environment access, preloaded module lookup.
This commit is contained in:
Mike Smith
parent
d7a5acb5ec
commit
6ba9413b55
126
sys/kern/kern_environment.c
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126
sys/kern/kern_environment.c
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/*-
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* Copyright (c) 1998 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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/*
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* The unified bootloader passes us a pointer to a preserved copy of
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* bootstrap/kernel environment variables.
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* We make these available using sysctl for both in-kernel and
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* out-of-kernel consumers.
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*
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* Note that the current sysctl infrastructure doesn't allow
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* dynamic insertion or traversal through handled spaces. Grr.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/libkern.h>
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#include <machine/bootinfo.h>
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char *kern_envp;
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static char *kernenv_next(char *cp);
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static void
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kernenv_init(void* arg)
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{
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if (bootinfo.bi_envp != 0)
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kern_envp = (char *)bootinfo.bi_envp;
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}
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SYSINIT(kernenv, SI_SUB_CONSOLE, SI_ORDER_FIRST, kernenv_init, 0);
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char *
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getenv(char *name)
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{
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char *cp, *ep;
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int len;
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for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
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for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
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;
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len = ep - cp;
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if (*ep = '=')
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ep++;
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if (!strncmp(name, cp, len))
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return(ep);
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}
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return(NULL);
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}
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static int
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sysctl_kernenv SYSCTL_HANDLER_ARGS
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{
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int *name = (int *)arg1;
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u_int namelen = arg2;
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char *cp;
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int i, error;
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if (kern_envp == NULL)
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return(ENOENT);
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name++;
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namelen--;
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if (namelen != 1)
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return(EINVAL);
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cp = kern_envp;
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for (i = 0; i < name[0]; i++) {
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cp = kernenv_next(cp);
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if (cp == NULL)
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break;
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}
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if (cp == NULL)
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return(ENOENT);
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error = SYSCTL_OUT(req, cp, strlen(cp) + 1);
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return (error);
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}
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SYSCTL_NODE(_kern, OID_AUTO, environment, CTLFLAG_RD, sysctl_kernenv, "kernel environment space");
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/*
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* Find the next entry after the one which (cp) falls within, return a
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* pointer to its start or NULL if there are no more.
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*/
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static char *
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kernenv_next(char *cp)
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{
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if (cp != NULL) {
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while (*cp != 0)
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cp++;
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cp++;
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if (*cp == 0)
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cp = NULL;
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}
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return(cp);
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}
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144
sys/kern/subr_module.c
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144
sys/kern/subr_module.c
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@ -0,0 +1,144 @@
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/*-
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* Copyright (c) 1998 Michael Smith
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/linker.h>
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/*
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* Preloaded module support
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*/
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caddr_t module_metadata;
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/*
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* Search for the preloaded module (name)
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*/
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caddr_t
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module_search_by_name(const char *name)
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{
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caddr_t curp;
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u_int32_t *hdr;
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if (module_metadata != NULL) {
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curp = module_metadata;
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for (;;) {
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hdr = (u_int32_t *)curp;
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if (hdr[0] == 0)
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break;
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/* Search for a MODINFO_NAME field */
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if ((hdr[0] == MODINFO_NAME) &&
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!strcmp(name, curp + sizeof(u_int32_t) * 2))
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return(curp);
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/* skip to next field */
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curp += sizeof(u_int32_t) * 2 + hdr[1];
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}
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}
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return(NULL);
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}
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/*
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* Search for the first preloaded module of (type)
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*/
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caddr_t
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module_search_by_type(const char *type)
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{
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caddr_t curp, lname;
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u_int32_t *hdr;
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if (module_metadata != NULL) {
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curp = module_metadata;
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lname = NULL;
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for (;;) {
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hdr = (u_int32_t *)curp;
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if (hdr[0] == 0)
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break;
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/* remember the start of each record */
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if (hdr[0] == MODINFO_NAME)
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lname = curp;
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/* Search for a MODINFO_TYPE field */
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if ((hdr[0] == MODINFO_TYPE) &&
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!strcmp(type, curp + sizeof(u_int32_t) * 2))
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return(lname);
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/* skip to next field */
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curp += sizeof(u_int32_t) * 2 + hdr[1];
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}
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}
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return(NULL);
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}
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/*
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* Given a preloaded module handle (mod), return a pointer
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* to the data for the attribute (inf).
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*/
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caddr_t
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module_search_info(caddr_t mod, int inf)
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{
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caddr_t curp;
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u_int32_t *hdr;
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u_int32_t type = 0;
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curp = mod;
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for (;;) {
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hdr = (u_int32_t *)curp;
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/* end of module data? */
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if (hdr[0] == 0)
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break;
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/*
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* We give up once we've looped back to what we were looking at
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* first - this should normally be a MODINFO_NAME field.
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*/
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if (type == 0) {
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type = hdr[0];
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} else {
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if (hdr[0] == type)
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break;
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}
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/*
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* Attribute match? Return pointer to data.
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* Consumer may safely assume that size value preceeds
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* data.
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*/
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if (hdr[0] == inf)
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return(curp + (sizeof(u_int32_t) * 2));
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/* skip to next field */
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curp += sizeof(u_int32_t) * 2 + hdr[1];
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}
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return(NULL);
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}
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