mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-26 11:47:31 +00:00
Code Issues Releases Activity
8dd27fd68b
freebsd/sys/kern/kern_sysctl.c
Peter Wemm a1d2540fa0 Fix the reversed source and dest args to bcopy() in the kernel space 
sysctl handler (ouch!)

Add a "const" qualifier to the source of the copyin() and copyout()
functions - the other const warning in kern_sysctl.c was silenced when
copyout was declared as having a const source.. (which it is)
1996-01-01 17:05:07 +00:00

1149 lines
27 KiB
C
Raw Blame History

/*-
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Karels at Berkeley Software Design, Inc.
*
* Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD
* project, to make these variables more userfriendly.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94
* $Id: kern_sysctl.c,v 1.58 1995/12/17 21:11:22 phk Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/unistd.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_extern.h>
/*
* Locking and stats
*/
static struct sysctl_lock {
int sl_lock;
int sl_want;
int sl_locked;
} memlock;
static int sysctl_root SYSCTL_HANDLER_ARGS;
extern struct linker_set sysctl_;
/*
* MIB definitions. XXX Very few of these, if any, belong here.
*/
SYSCTL_NODE(, 0, sysctl, CTLFLAG_RW, 0,
"Sysctl internal magic");
SYSCTL_NODE(, CTL_KERN, kern, CTLFLAG_RW, 0,
"High kernel, proc, limits &c");
SYSCTL_NODE(, CTL_VM, vm, CTLFLAG_RW, 0,
"Virtual memory");
SYSCTL_NODE(, CTL_FS, fs, CTLFLAG_RW, 0,
"File system");
SYSCTL_NODE(, CTL_NET, net, CTLFLAG_RW, 0,
"Network, (see socket.h)");
SYSCTL_NODE(, CTL_DEBUG, debug, CTLFLAG_RW, 0,
"Debugging");
SYSCTL_NODE(, CTL_HW, hw, CTLFLAG_RW, 0,
"hardware");
SYSCTL_NODE(, CTL_MACHDEP, machdep, CTLFLAG_RW, 0,
"machine dependent");
SYSCTL_NODE(, CTL_USER, user, CTLFLAG_RW, 0,
"user-level");
SYSCTL_STRING(_kern, KERN_OSRELEASE, osrelease, CTLFLAG_RD, osrelease, 0, "");
SYSCTL_INT(_kern, KERN_OSREV, osrevision, CTLFLAG_RD, 0, BSD, "");
SYSCTL_STRING(_kern, KERN_VERSION, version, CTLFLAG_RD, version, 0, "");
SYSCTL_STRING(_kern, KERN_OSTYPE, ostype, CTLFLAG_RD, ostype, 0, "");
extern int osreldate;
SYSCTL_INT(_kern, KERN_OSRELDATE, osreldate, CTLFLAG_RD, &osreldate, 0, "");
SYSCTL_INT(_kern, KERN_MAXPROC, maxproc, CTLFLAG_RD, &maxproc, 0, "");
SYSCTL_INT(_kern, KERN_MAXPROCPERUID, maxprocperuid,
CTLFLAG_RD, &maxprocperuid, 0, "");
SYSCTL_INT(_kern, KERN_ARGMAX, argmax, CTLFLAG_RD, 0, ARG_MAX, "");
SYSCTL_INT(_kern, KERN_POSIX1, posix1version, CTLFLAG_RD, 0, _POSIX_VERSION, "");
SYSCTL_INT(_kern, KERN_NGROUPS, ngroups, CTLFLAG_RD, 0, NGROUPS_MAX, "");
SYSCTL_INT(_kern, KERN_JOB_CONTROL, job_control, CTLFLAG_RD, 0, 1, "");
#ifdef _POSIX_SAVED_IDS
SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 0, 1, "");
#else
SYSCTL_INT(_kern, KERN_SAVED_IDS, saved_ids, CTLFLAG_RD, 0, 0, "");
#endif
char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */
SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile,
CTLFLAG_RW, kernelname, sizeof kernelname, "");
SYSCTL_INT(_hw, HW_NCPU, ncpu, CTLFLAG_RD, 0, 1, "");
SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD, 0, BYTE_ORDER, "");
SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD, 0, PAGE_SIZE, "");
char hostname[MAXHOSTNAMELEN];
SYSCTL_STRING(_kern, KERN_HOSTNAME, hostname, CTLFLAG_RW,
hostname, sizeof(hostname), "");
int securelevel = -1;
static int
sysctl_kern_securelvl SYSCTL_HANDLER_ARGS
{
int error, level;
level = securelevel;
error = sysctl_handle_int(oidp, &level, 0, req);
if (error || !req->newptr)
return (error);
if (level < securelevel && req->p->p_pid != 1)
return (EPERM);
securelevel = level;
return (error);
}
SYSCTL_PROC(_kern, KERN_SECURELVL, securelevel, CTLTYPE_INT|CTLFLAG_RW,
0, 0, sysctl_kern_securelvl, "I", "");
char domainname[MAXHOSTNAMELEN];
SYSCTL_STRING(_kern, KERN_DOMAINNAME, domainname, CTLFLAG_RW,
&domainname, sizeof(domainname), "");
long hostid;
/* Some trouble here, if sizeof (int) != sizeof (long) */
SYSCTL_INT(_kern, KERN_HOSTID, hostid, CTLFLAG_RW, &hostid, 0, "");
/*
* This is really cheating. These actually live in the libc, something
* which I'm not quite sure is a good idea anyway, but in order for
* getnext and friends to actually work, we define dummies here.
*/
SYSCTL_STRING(_user, USER_CS_PATH, cs_path, CTLFLAG_RW, "", 0, "");
SYSCTL_INT(_user, USER_BC_BASE_MAX, bc_base_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_BC_DIM_MAX, bc_dim_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_BC_SCALE_MAX, bc_scale_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_BC_STRING_MAX, bc_string_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_COLL_WEIGHTS_MAX, coll_weights_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_EXPR_NEST_MAX, expr_nest_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_LINE_MAX, line_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_RE_DUP_MAX, re_dup_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_VERSION, posix2_version, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_C_BIND, posix2_c_bind, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_C_DEV, posix2_c_dev, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_CHAR_TERM, posix2_char_term, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_FORT_DEV, posix2_fort_dev, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_FORT_RUN, posix2_fort_run, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_LOCALEDEF, posix2_localedef, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_SW_DEV, posix2_sw_dev, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_POSIX2_UPE, posix2_upe, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_STREAM_MAX, stream_max, CTLFLAG_RW, 0, 0, "");
SYSCTL_INT(_user, USER_TZNAME_MAX, tzname_max, CTLFLAG_RW, 0, 0, "");
/*
* End of MIB definitions.
*/
/*
* Initialization of the MIB tree.
*
* Order by number in each linker_set.
*/
static int
sysctl_order_cmp(const void *a, const void *b)
{
const struct sysctl_oid **pa, **pb;
pa = (const struct sysctl_oid **)a;
pb = (const struct sysctl_oid **)b;
if (*pa == NULL)
return (1);
if (*pb == NULL)
return (-1);
return ((*pa)->oid_number - (*pb)->oid_number);
}
static void
sysctl_order(void *arg)
{
int j, k;
struct linker_set *l = (struct linker_set *) arg;
struct sysctl_oid **oidpp;
/* First, find the highest oid we have */
j = l->ls_length;
oidpp = (struct sysctl_oid **) l->ls_items;
for (k = 0; j--; oidpp++)
if (*oidpp && (*oidpp)->oid_number > k)
k = (*oidpp)->oid_number;
/* Next, replace all OID_AUTO oids with new numbers */
j = l->ls_length;
oidpp = (struct sysctl_oid **) l->ls_items;
k += 100;
for (; j--; oidpp++)
if (*oidpp && (*oidpp)->oid_number == OID_AUTO)
(*oidpp)->oid_number = k++;
/* Finally: sort by oid */
j = l->ls_length;
oidpp = (struct sysctl_oid **) l->ls_items;
for (; j--; oidpp++) {
if (!*oidpp)
continue;
if ((*oidpp)->oid_arg1 == arg) {
*oidpp = 0;
continue;
}
if (((*oidpp)->oid_kind & CTLTYPE) == CTLTYPE_NODE)
if (!(*oidpp)->oid_handler)
sysctl_order((*oidpp)->oid_arg1);
}
qsort(l->ls_items, l->ls_length, sizeof l->ls_items[0],
sysctl_order_cmp);
}
SYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_order, &sysctl_);
/*
* "Staff-functions"
*
* These functions implement a presently undocumented interface
* used by the sysctl program to walk the tree, and get the type
* so it can print the value.
* This interface is under work and consideration, and should probably
* be killed with a big axe by the first person who can find the time.
* (be aware though, that the proper interface isn't as obvious as it
* may seem, there are various conflicting requirements.
*
* {0,0} printf the entire MIB-tree.
* {0,1,...} return the name of the "..." OID.
* {0,2,...} return the next OID.
* {0,3} return the OID of the name in "new"
* {0,4,...} return the kind & format info for the "..." OID.
*/
static void
sysctl_sysctl_debug_dump_node(struct linker_set *l, int i)
{
int j, k;
struct sysctl_oid **oidpp;
j = l->ls_length;
oidpp = (struct sysctl_oid **) l->ls_items;
for (; j--; oidpp++) {
if (!*oidpp)
continue;
for (k=0; k<i; k++)
printf(" ");
if ((*oidpp)->oid_number > 100) {
printf("Junk! %p # %d %s k %x a1 %p a2 %x h %p\n",
*oidpp,
(*oidpp)->oid_number, (*oidpp)->oid_name,
(*oidpp)->oid_kind, (*oidpp)->oid_arg1,
(*oidpp)->oid_arg2, (*oidpp)->oid_handler);
continue;
}
printf("%d %s ", (*oidpp)->oid_number, (*oidpp)->oid_name);
printf("%c%c",
(*oidpp)->oid_kind & CTLFLAG_RD ? 'R':' ',
(*oidpp)->oid_kind & CTLFLAG_WR ? 'W':' ');
switch ((*oidpp)->oid_kind & CTLTYPE) {
case CTLTYPE_NODE:
if ((*oidpp)->oid_handler) {
printf(" Node(proc)\n");
} else {
printf(" Node\n");
sysctl_sysctl_debug_dump_node(
(*oidpp)->oid_arg1, i+2);
}
break;
case CTLTYPE_INT: printf(" Int\n"); break;
case CTLTYPE_STRING: printf(" String\n"); break;
case CTLTYPE_QUAD: printf(" Quad\n"); break;
case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break;
default: printf("\n");
}
}
}
static int
sysctl_sysctl_debug SYSCTL_HANDLER_ARGS
{
sysctl_sysctl_debug_dump_node(&sysctl_, 0);
return ENOENT;
}
SYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD,
0, 0, sysctl_sysctl_debug, "-", "");
static int
sysctl_sysctl_name SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1;
u_int namelen = arg2;
int i, j, error = 0;
struct sysctl_oid **oidpp;
struct linker_set *lsp = &sysctl_;
char buf[10];
while (namelen) {
if (!lsp) {
sprintf(buf,"%d",*name);
if (req->oldidx)
error = SYSCTL_OUT(req, ".", 1);
if (!error)
error = SYSCTL_OUT(req, buf, strlen(buf));
if (error)
return (error);
namelen--;
name++;
continue;
}
oidpp = (struct sysctl_oid **) lsp->ls_items;
j = lsp->ls_length;
lsp = 0;
for (i = 0; i < j; i++, oidpp++) {
if (*oidpp && ((*oidpp)->oid_number != *name))
continue;
if (req->oldidx)
error = SYSCTL_OUT(req, ".", 1);
if (!error)
error = SYSCTL_OUT(req, (*oidpp)->oid_name,
strlen((*oidpp)->oid_name));
if (error)
return (error);
namelen--;
name++;
if (((*oidpp)->oid_kind & CTLTYPE) != CTLTYPE_NODE)
break;
if ((*oidpp)->oid_handler)
break;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
break;
}
}
return (SYSCTL_OUT(req, "", 1));
}
SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD, sysctl_sysctl_name, "");
static int
sysctl_sysctl_next_ls (struct linker_set *lsp, int *name, u_int namelen,
int *next, int *len, int level, struct sysctl_oid **oidp)
{
int i, j;
struct sysctl_oid **oidpp;
oidpp = (struct sysctl_oid **) lsp->ls_items;
j = lsp->ls_length;
*len = level;
for (i = 0; i < j; i++, oidpp++) {
if (!*oidpp)
continue;
*next = (*oidpp)->oid_number;
*oidp = *oidpp;
if (!namelen) {
if (((*oidpp)->oid_kind & CTLTYPE) != CTLTYPE_NODE)
return 0;
if ((*oidpp)->oid_handler)
/* We really should call the handler here...*/
return 0;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
return (sysctl_sysctl_next_ls (lsp, 0, 0, next+1,
len, level+1, oidp));
}
if ((*oidpp)->oid_number < *name)
continue;
if ((*oidpp)->oid_number > *name) {
if (((*oidpp)->oid_kind & CTLTYPE) != CTLTYPE_NODE)
return 0;
if ((*oidpp)->oid_handler)
return 0;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, name+1, namelen-1,
next+1, len, level+1, oidp))
return (0);
namelen = 1;
*len = level;
continue;
}
if (((*oidpp)->oid_kind & CTLTYPE) != CTLTYPE_NODE)
continue;
if ((*oidpp)->oid_handler)
continue;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
if (!sysctl_sysctl_next_ls (lsp, name+1, namelen-1, next+1,
len, level+1, oidp))
return (0);
namelen = 1;
*len = level;
}
return 1;
}
static int
sysctl_sysctl_next SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1;
u_int namelen = arg2;
int i, j, error;
struct sysctl_oid *oid;
struct linker_set *lsp = &sysctl_;
int newoid[CTL_MAXNAME];
i = sysctl_sysctl_next_ls (lsp, name, namelen, newoid, &j, 1, &oid);
if (i)
return ENOENT;
error = SYSCTL_OUT(req, newoid, j * sizeof (int));
return (error);
}
SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD, sysctl_sysctl_next, "");
static int
name2oid (char *name, int *oid, int *len, struct sysctl_oid **oidp)
{
int i, j;
struct sysctl_oid **oidpp;
struct linker_set *lsp = &sysctl_;
char *p;
if (!*name)
return ENOENT;
p = name + strlen(name) - 1 ;
if (*p == '.')
*p = '\0';
*len = 0;
for (p = name; *p && *p != '.'; p++)
;
i = *p;
if (i == '.')
*p = '\0';
j = lsp->ls_length;
oidpp = (struct sysctl_oid **) lsp->ls_items;
while (j-- && *len < CTL_MAXNAME) {
if (!*oidpp)
continue;
if (strcmp(name, (*oidpp)->oid_name)) {
oidpp++;
continue;
}
*oid++ = (*oidpp)->oid_number;
(*len)++;
if (!i) {
if (oidp)
*oidp = *oidpp;
return (0);
}
if (((*oidpp)->oid_kind & CTLTYPE) != CTLTYPE_NODE)
break;
if ((*oidpp)->oid_handler)
break;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
j = lsp->ls_length;
oidpp = (struct sysctl_oid **)lsp->ls_items;
name = p+1;
for (p = name; *p && *p != '.'; p++)
;
i = *p;
if (i == '.')
*p = '\0';
}
return ENOENT;
}
static int
sysctl_sysctl_name2oid SYSCTL_HANDLER_ARGS
{
char *p;
int error, oid[CTL_MAXNAME], len;
struct sysctl_oid *op = 0;
if (!req->newlen)
return ENOENT;
p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK);
error = SYSCTL_IN(req, p, req->newlen);
if (error) {
free(p, M_SYSCTL);
return (error);
}
p [req->newlen] = '\0';
error = name2oid(p, oid, &len, &op);
free(p, M_SYSCTL);
if (error)
return (error);
error = SYSCTL_OUT(req, oid, len * sizeof *oid);
return (error);
}
SYSCTL_PROC(_sysctl, 3, name2oid, CTLFLAG_RW|CTLFLAG_ANYBODY, 0, 0,
sysctl_sysctl_name2oid, "I", "");
static int
sysctl_sysctl_oidfmt SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1, error;
u_int namelen = arg2;
int indx, j;
struct sysctl_oid **oidpp;
struct linker_set *lsp = &sysctl_;
j = lsp->ls_length;
oidpp = (struct sysctl_oid **) lsp->ls_items;
indx = 0;
while (j-- && indx < CTL_MAXNAME) {
if (*oidpp && ((*oidpp)->oid_number == name[indx])) {
indx++;
if (((*oidpp)->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
if ((*oidpp)->oid_handler)
goto found;
if (indx == namelen)
goto found;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
j = lsp->ls_length;
oidpp = (struct sysctl_oid **)lsp->ls_items;
} else {
if (indx != namelen)
return EISDIR;
goto found;
}
} else {
oidpp++;
}
}
return ENOENT;
found:
if (!(*oidpp)->oid_fmt)
return ENOENT;
error = SYSCTL_OUT(req,
&(*oidpp)->oid_kind, sizeof((*oidpp)->oid_kind));
if (!error)
error = SYSCTL_OUT(req, (*oidpp)->oid_fmt,
strlen((*oidpp)->oid_fmt)+1);
return (error);
}
SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD, sysctl_sysctl_oidfmt, "");
/*
* Default "handler" functions.
*/
/*
* Handle an integer, signed or unsigned.
* Two cases:
* a variable: point arg1 at it.
* a constant: pass it in arg2.
*/
int
sysctl_handle_int SYSCTL_HANDLER_ARGS
{
int error = 0;
if (arg1)
error = SYSCTL_OUT(req, arg1, sizeof(int));
else if (arg2)
error = SYSCTL_OUT(req, &arg2, sizeof(int));
if (error || !req->newptr)
return (error);
if (!arg1)
error = EPERM;
else
error = SYSCTL_IN(req, arg1, sizeof(int));
return (error);
}
/*
* Handle our generic '\0' terminated 'C' string.
* Two cases:
* a variable string: point arg1 at it, arg2 is max length.
* a constant string: point arg1 at it, arg2 is zero.
*/
int
sysctl_handle_string SYSCTL_HANDLER_ARGS
{
int error=0;
error = SYSCTL_OUT(req, arg1, strlen((char *)arg1)+1);
if (error || !req->newptr || !arg2)
return (error);
if ((req->newlen - req->newidx) > arg2) {
error = E2BIG;
} else {
arg2 = (req->newlen - req->newidx);
error = SYSCTL_IN(req, arg1, arg2);
((char *)arg1)[arg2] = '\0';
}
return (error);
}
/*
* Handle any kind of opaque data.
* arg1 points to it, arg2 is the size.
*/
int
sysctl_handle_opaque SYSCTL_HANDLER_ARGS
{
int error;
error = SYSCTL_OUT(req, arg1, arg2);
if (error || !req->newptr)
return (error);
error = SYSCTL_IN(req, arg1, arg2);
return (error);
}
/*
* Transfer functions to/from kernel space.
* XXX: rather untested at this point
*/
static int
sysctl_old_kernel(struct sysctl_req *req, const void *p, int l)
{
int i = 0;
if (req->oldptr) {
i = min(req->oldlen - req->oldidx, l);
if (i > 0)
bcopy(p, req->oldptr + req->oldidx, i);
}
req->oldidx += l;
if (i != l)
return (ENOMEM);
return (0);
}
static int
sysctl_new_kernel(struct sysctl_req *req, const void *p, int l)
{
if (!req->newptr)
return 0;
if (req->newlen - req->newidx < l)
return (EINVAL);
bcopy(p, req->newptr + req->newidx, l);
req->newidx += l;
return (0);
}
/*
* Transfer function to/from user space.
*/
static int
sysctl_old_user(struct sysctl_req *req, const void *p, int l)
{
int error = 0, i = 0;
if (req->lock == 1 && req->oldptr) {
vslock(req->oldptr, req->oldlen);
req->lock = 2;
}
if (req->oldptr) {
i = min(req->oldlen - req->oldidx, l);
if (i > 0)
error = copyout(p, req->oldptr + req->oldidx, i);
}
req->oldidx += l;
if (error)
return (error);
if (req->oldptr && i < l)
return (ENOMEM);
return (0);
}
static int
sysctl_new_user(struct sysctl_req *req, void *p, int l)
{
int error;
if (!req->newptr)
return 0;
if (req->newlen - req->newidx < l)
return (EINVAL);
error = copyin(req->newptr + req->newidx, p, l);
req->newidx += l;
return (error);
}
/*
* Traverse our tree, and find the right node, execute whatever it points
* at, and return the resulting error code.
*/
int
sysctl_root SYSCTL_HANDLER_ARGS
{
int *name = (int *) arg1;
u_int namelen = arg2;
int indx, i, j;
struct sysctl_oid **oidpp;
struct linker_set *lsp = &sysctl_;
j = lsp->ls_length;
oidpp = (struct sysctl_oid **) lsp->ls_items;
indx = 0;
while (j-- && indx < CTL_MAXNAME) {
if (*oidpp && ((*oidpp)->oid_number == name[indx])) {
indx++;
if ((*oidpp)->oid_kind & CTLFLAG_NOLOCK)
req->lock = 0;
if (((*oidpp)->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
if ((*oidpp)->oid_handler)
goto found;
if (indx == namelen)
return ENOENT;
lsp = (struct linker_set*)(*oidpp)->oid_arg1;
j = lsp->ls_length;
oidpp = (struct sysctl_oid **)lsp->ls_items;
} else {
if (indx != namelen)
return EISDIR;
goto found;
}
} else {
oidpp++;
}
}
return ENOENT;
found:
/* If writing isn't allowed */
if (req->newptr && !((*oidpp)->oid_kind & CTLFLAG_WR))
return (EPERM);
/* Most likely only root can write */
if (!((*oidpp)->oid_kind & CTLFLAG_ANYBODY) &&
req->newptr && req->p &&
(i = suser(req->p->p_ucred, &req->p->p_acflag)))
return (i);
if (!(*oidpp)->oid_handler)
return EINVAL;
if (((*oidpp)->oid_kind & CTLTYPE) == CTLTYPE_NODE) {
i = ((*oidpp)->oid_handler) (*oidpp,
name + indx, namelen - indx,
req);
} else {
i = ((*oidpp)->oid_handler) (*oidpp,
(*oidpp)->oid_arg1, (*oidpp)->oid_arg2,
req);
}
return (i);
}
#ifndef _SYS_SYSPROTO_H_
struct sysctl_args {
int *name;
u_int namelen;
void *old;
size_t *oldlenp;
void *new;
size_t newlen;
};
#endif
int
__sysctl(struct proc *p, struct sysctl_args *uap, int *retval)
{
int error, i, j, name[CTL_MAXNAME];
if (uap->namelen > CTL_MAXNAME || uap->namelen < 2)
return (EINVAL);
error = copyin(uap->name, &name, uap->namelen * sizeof(int));
if (error)
return (error);
error = userland_sysctl(p, name, uap->namelen,
uap->old, uap->oldlenp, 0,
uap->new, uap->newlen, &j);
if (error && error != ENOMEM)
return (error);
if (uap->oldlenp) {
i = copyout(&j, uap->oldlenp, sizeof(j));
if (i)
return (i);
}
return (error);
}
/*
* This is used from various compatibility syscalls too. That's why name
* must be in kernel space.
*/
int
userland_sysctl(struct proc *p, int *name, u_int namelen, void *old, size_t *oldlenp, int inkernel, void *new, size_t newlen, int *retval)
{
int error = 0;
struct sysctl_req req;
bzero(&req, sizeof req);
req.p = p;
if (oldlenp) {
if (inkernel) {
req.oldlen = *oldlenp;
} else {
error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp));
if (error)
return (error);
}
}
if (old) {
if (!useracc(old, req.oldlen, B_WRITE))
return (EFAULT);
req.oldptr= old;
}
if (newlen) {
if (!useracc(new, req.newlen, B_READ))
return (EFAULT);
req.newlen = newlen;
req.newptr = new;
}
req.oldfunc = sysctl_old_user;
req.newfunc = sysctl_new_user;
req.lock = 1;
/* XXX this should probably be done in a general way */
while (memlock.sl_lock) {
memlock.sl_want = 1;
(void) tsleep((caddr_t)&memlock, PRIBIO+1, "sysctl", 0);
memlock.sl_locked++;
}
memlock.sl_lock = 1;
error = sysctl_root(0, name, namelen, &req);
if (req.lock == 2)
vsunlock(req.oldptr, req.oldlen, B_WRITE);
memlock.sl_lock = 0;
if (memlock.sl_want) {
memlock.sl_want = 0;
wakeup((caddr_t)&memlock);
}
if (error && error != ENOMEM)
return (error);
if (retval) {
if (req.oldptr && req.oldidx > req.oldlen)
*retval = req.oldlen;
else
*retval = req.oldidx;
}
return (error);
}
#ifdef COMPAT_43
#include <sys/socket.h>
#define KINFO_PROC (0<<8)
#define KINFO_RT (1<<8)
#define KINFO_VNODE (2<<8)
#define KINFO_FILE (3<<8)
#define KINFO_METER (4<<8)
#define KINFO_LOADAVG (5<<8)
#define KINFO_CLOCKRATE (6<<8)
/* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
#define KINFO_BSDI_SYSINFO (101<<8)
/*
* XXX this is bloat, but I hope it's better here than on the potentially
* limited kernel stack... -Peter
*/
static struct {
int bsdi_machine; /* "i386" on BSD/386 */
/* ^^^ this is an offset to the string, relative to the struct start */
char *pad0;
long pad1;
long pad2;
long pad3;
u_long pad4;
u_long pad5;
u_long pad6;
int bsdi_ostype; /* "BSD/386" on BSD/386 */
int bsdi_osrelease; /* "1.1" on BSD/386 */
long pad7;
long pad8;
char *pad9;
long pad10;
long pad11;
int pad12;
long pad13;
quad_t pad14;
long pad15;
struct timeval pad16;
/* we dont set this, because BSDI's uname used gethostname() instead */
int bsdi_hostname; /* hostname on BSD/386 */
/* the actual string data is appended here */
} bsdi_si;
/*
* this data is appended to the end of the bsdi_si structure during copyout.
* The "char *" offsets are relative to the base of the bsdi_si struct.
* This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
* should not exceed the length of the buffer here... (or else!! :-)
*/
static char bsdi_strings[80]; /* It had better be less than this! */
#ifndef _SYS_SYSPROTO_H_
struct getkerninfo_args {
int op;
char *where;
int *size;
int arg;
};
#endif
int
ogetkerninfo(struct proc *p, struct getkerninfo_args *uap, int *retval)
{
int error, name[6];
u_int size;
switch (uap->op & 0xff00) {
case KINFO_RT:
name[0] = CTL_NET;
name[1] = PF_ROUTE;
name[2] = 0;
name[3] = (uap->op & 0xff0000) >> 16;
name[4] = uap->op & 0xff;
name[5] = uap->arg;
error = userland_sysctl(p, name, 6, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_VNODE:
name[0] = CTL_KERN;
name[1] = KERN_VNODE;
error = userland_sysctl(p, name, 2, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_PROC:
name[0] = CTL_KERN;
name[1] = KERN_PROC;
name[2] = uap->op & 0xff;
name[3] = uap->arg;
error = userland_sysctl(p, name, 4, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_FILE:
name[0] = CTL_KERN;
name[1] = KERN_FILE;
error = userland_sysctl(p, name, 2, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_METER:
name[0] = CTL_VM;
name[1] = VM_METER;
error = userland_sysctl(p, name, 2, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_LOADAVG:
name[0] = CTL_VM;
name[1] = VM_LOADAVG;
error = userland_sysctl(p, name, 2, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_CLOCKRATE:
name[0] = CTL_KERN;
name[1] = KERN_CLOCKRATE;
error = userland_sysctl(p, name, 2, uap->where, uap->size,
0, 0, 0, &size);
break;
case KINFO_BSDI_SYSINFO: {
/*
* this is pretty crude, but it's just enough for uname()
* from BSDI's 1.x libc to work.
*
* In particular, it doesn't return the same results when
* the supplied buffer is too small. BSDI's version apparently
* will return the amount copied, and set the *size to how
* much was needed. The emulation framework here isn't capable
* of that, so we just set both to the amount copied.
* BSDI's 2.x product apparently fails with ENOMEM in this
* scenario.
*/
u_int needed;
u_int left;
char *s;
bzero((char *)&bsdi_si, sizeof(bsdi_si));
bzero(bsdi_strings, sizeof(bsdi_strings));
s = bsdi_strings;
bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
strcpy(s, ostype);
s += strlen(s) + 1;
bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
strcpy(s, osrelease);
s += strlen(s) + 1;
bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
strcpy(s, machine);
s += strlen(s) + 1;
needed = sizeof(bsdi_si) + (s - bsdi_strings);
if (uap->where == NULL) {
/* process is asking how much buffer to supply.. */
size = needed;
error = 0;
break;
}
/* if too much buffer supplied, trim it down */
if (size > needed)
size = needed;
/* how much of the buffer is remaining */
left = size;
if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
break;
/* is there any point in continuing? */
if (left > sizeof(bsdi_si)) {
left -= sizeof(bsdi_si);
error = copyout(&bsdi_strings,
uap->where + sizeof(bsdi_si), left);
}
break;
}
default:
return (EOPNOTSUPP);
}
if (error)
return (error);
*retval = size;
if (uap->size)
error = copyout((caddr_t)&size, (caddr_t)uap->size,
sizeof(size));
return (error);
}
#endif /* COMPAT_43 */
Reference in New Issue View Git Blame Copy Permalink