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|
/* $OpenBSD: kern_sysctl.c,v 1.76 2002/12/17 23:11:31 millert Exp $ */
/* $NetBSD: kern_sysctl.c,v 1.17 1996/05/20 17:49:05 mrg Exp $ */
/*-
* 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.
*
* 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
*/
/*
* sysctl system call.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/unistd.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <uvm/uvm_extern.h>
#include <sys/sysctl.h>
#include <sys/msgbuf.h>
#include <sys/dkstat.h>
#include <sys/vmmeter.h>
#include <sys/namei.h>
#include <sys/exec.h>
#include <sys/mbuf.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <dev/rndvar.h>
#ifdef DDB
#include <ddb/db_var.h>
#endif
#ifdef SYSVMSG
#include <sys/msg.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVSHM
#include <sys/shm.h>
#endif
extern struct forkstat forkstat;
extern struct nchstats nchstats;
extern int nselcoll, fscale;
extern struct disklist_head disklist;
extern fixpt_t ccpu;
extern long numvnodes;
int sysctl_diskinit(int, struct proc *);
int sysctl_proc_args(int *, u_int, void *, size_t *, struct proc *);
/*
* Lock to avoid too many processes vslocking a large amount of memory
* at the same time.
*/
struct lock sysctl_lock, sysctl_disklock;
#if defined(KMEMSTATS) || defined(DIAGNOSTIC) || defined(FFS_SOFTUPDATES)
struct lock sysctl_kmemlock;
#endif
void
sysctl_init()
{
lockinit(&sysctl_lock, PLOCK|PCATCH, "sysctl", 0, 0);
lockinit(&sysctl_disklock, PLOCK|PCATCH, "sysctl_disklock", 0, 0);
#if defined(KMEMSTATS) || defined(DIAGNOSTIC) || defined(FFS_SOFTUPDATES)
lockinit(&sysctl_kmemlock, PLOCK|PCATCH, "sysctl_kmemlock", 0, 0);
#endif
}
int
sys___sysctl(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
register struct sys___sysctl_args /* {
syscallarg(int *) name;
syscallarg(u_int) namelen;
syscallarg(void *) old;
syscallarg(size_t *) oldlenp;
syscallarg(void *) new;
syscallarg(size_t) newlen;
} */ *uap = v;
int error, dolock = 1;
size_t savelen = 0, oldlen = 0;
sysctlfn *fn;
int name[CTL_MAXNAME];
if (SCARG(uap, new) != NULL &&
(error = suser(p->p_ucred, &p->p_acflag)))
return (error);
/*
* all top-level sysctl names are non-terminal
*/
if (SCARG(uap, namelen) > CTL_MAXNAME || SCARG(uap, namelen) < 2)
return (EINVAL);
error = copyin(SCARG(uap, name), &name,
SCARG(uap, namelen) * sizeof(int));
if (error)
return (error);
switch (name[0]) {
case CTL_KERN:
fn = kern_sysctl;
if (name[2] == KERN_VNODE) /* XXX */
dolock = 0;
break;
case CTL_HW:
fn = hw_sysctl;
break;
case CTL_VM:
fn = uvm_sysctl;
break;
case CTL_NET:
fn = net_sysctl;
break;
case CTL_FS:
fn = fs_sysctl;
break;
case CTL_VFS:
fn = vfs_sysctl;
break;
case CTL_MACHDEP:
fn = cpu_sysctl;
break;
#ifdef DEBUG
case CTL_DEBUG:
fn = debug_sysctl;
break;
#endif
#ifdef DDB
case CTL_DDB:
fn = ddb_sysctl;
break;
#endif
default:
return (EOPNOTSUPP);
}
if (SCARG(uap, oldlenp) &&
(error = copyin(SCARG(uap, oldlenp), &oldlen, sizeof(oldlen))))
return (error);
if (SCARG(uap, old) != NULL) {
if ((error = lockmgr(&sysctl_lock, LK_EXCLUSIVE, NULL, p)) != 0)
return (error);
if (dolock) {
error = uvm_vslock(p, SCARG(uap, old), oldlen,
VM_PROT_READ|VM_PROT_WRITE);
if (error) {
lockmgr(&sysctl_lock, LK_RELEASE, NULL, p);
return (error);
}
}
savelen = oldlen;
}
error = (*fn)(name + 1, SCARG(uap, namelen) - 1, SCARG(uap, old),
&oldlen, SCARG(uap, new), SCARG(uap, newlen), p);
if (SCARG(uap, old) != NULL) {
if (dolock)
uvm_vsunlock(p, SCARG(uap, old), savelen);
lockmgr(&sysctl_lock, LK_RELEASE, NULL, p);
}
if (error)
return (error);
if (SCARG(uap, oldlenp))
error = copyout(&oldlen, SCARG(uap, oldlenp), sizeof(oldlen));
return (error);
}
/*
* Attributes stored in the kernel.
*/
char hostname[MAXHOSTNAMELEN];
int hostnamelen;
char domainname[MAXHOSTNAMELEN];
int domainnamelen;
long hostid;
char *disknames = NULL;
struct diskstats *diskstats = NULL;
#ifdef INSECURE
int securelevel = -1;
#else
int securelevel;
#endif
/*
* kernel related system variables.
*/
int
kern_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
int error, level, inthostid, oldsgap;
extern int somaxconn, sominconn;
extern int usermount, nosuidcoredump;
extern long cp_time[CPUSTATES];
extern int stackgap_random;
#ifdef CRYPTO
extern int usercrypto;
extern int userasymcrypto;
extern int cryptodevallowsoft;
#endif
/* all sysctl names at this level are terminal except a ton of them */
if (namelen != 1) {
switch (name[0]) {
case KERN_PROC:
case KERN_PROF:
case KERN_MALLOCSTATS:
case KERN_TTY:
case KERN_POOL:
case KERN_PROC_ARGS:
case KERN_SYSVIPC_INFO:
case KERN_SEMINFO:
case KERN_SHMINFO:
break;
default:
return (ENOTDIR); /* overloaded */
}
}
switch (name[0]) {
case KERN_OSTYPE:
return (sysctl_rdstring(oldp, oldlenp, newp, ostype));
case KERN_OSRELEASE:
return (sysctl_rdstring(oldp, oldlenp, newp, osrelease));
case KERN_OSREV:
return (sysctl_rdint(oldp, oldlenp, newp, OpenBSD));
case KERN_OSVERSION:
return (sysctl_rdstring(oldp, oldlenp, newp, osversion));
case KERN_VERSION:
return (sysctl_rdstring(oldp, oldlenp, newp, version));
case KERN_MAXVNODES:
return(sysctl_int(oldp, oldlenp, newp, newlen, &desiredvnodes));
case KERN_MAXPROC:
return (sysctl_int(oldp, oldlenp, newp, newlen, &maxproc));
case KERN_MAXFILES:
return (sysctl_int(oldp, oldlenp, newp, newlen, &maxfiles));
case KERN_NFILES:
return (sysctl_rdint(oldp, oldlenp, newp, nfiles));
case KERN_TTYCOUNT:
return (sysctl_rdint(oldp, oldlenp, newp, tty_count));
case KERN_NUMVNODES:
return (sysctl_rdint(oldp, oldlenp, newp, numvnodes));
case KERN_ARGMAX:
return (sysctl_rdint(oldp, oldlenp, newp, ARG_MAX));
case KERN_NSELCOLL:
return (sysctl_rdint(oldp, oldlenp, newp, nselcoll));
case KERN_SECURELVL:
level = securelevel;
if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &level)) ||
newp == NULL)
return (error);
if ((securelevel > 0 || level < -1)
&& level < securelevel && p->p_pid != 1)
return (EPERM);
securelevel = level;
return (0);
case KERN_HOSTNAME:
error = sysctl_tstring(oldp, oldlenp, newp, newlen,
hostname, sizeof(hostname));
if (newp && !error)
hostnamelen = newlen;
return (error);
case KERN_DOMAINNAME:
error = sysctl_tstring(oldp, oldlenp, newp, newlen,
domainname, sizeof(domainname));
if (newp && !error)
domainnamelen = newlen;
return (error);
case KERN_HOSTID:
inthostid = hostid; /* XXX assumes sizeof long <= sizeof int */
error = sysctl_int(oldp, oldlenp, newp, newlen, &inthostid);
hostid = inthostid;
return (error);
case KERN_CLOCKRATE:
return (sysctl_clockrate(oldp, oldlenp));
case KERN_BOOTTIME:
return (sysctl_rdstruct(oldp, oldlenp, newp, &boottime,
sizeof(struct timeval)));
case KERN_VNODE:
return (sysctl_vnode(oldp, oldlenp, p));
case KERN_PROC:
return (sysctl_doproc(name + 1, namelen - 1, oldp, oldlenp));
case KERN_PROC_ARGS:
return (sysctl_proc_args(name + 1, namelen - 1, oldp, oldlenp,
p));
case KERN_FILE:
return (sysctl_file(oldp, oldlenp));
case KERN_MBSTAT:
return (sysctl_rdstruct(oldp, oldlenp, newp, &mbstat,
sizeof(mbstat)));
#ifdef GPROF
case KERN_PROF:
return (sysctl_doprof(name + 1, namelen - 1, oldp, oldlenp,
newp, newlen));
#endif
case KERN_POSIX1:
return (sysctl_rdint(oldp, oldlenp, newp, _POSIX_VERSION));
case KERN_NGROUPS:
return (sysctl_rdint(oldp, oldlenp, newp, NGROUPS_MAX));
case KERN_JOB_CONTROL:
return (sysctl_rdint(oldp, oldlenp, newp, 1));
case KERN_SAVED_IDS:
#ifdef _POSIX_SAVED_IDS
return (sysctl_rdint(oldp, oldlenp, newp, 1));
#else
return (sysctl_rdint(oldp, oldlenp, newp, 0));
#endif
case KERN_MAXPARTITIONS:
return (sysctl_rdint(oldp, oldlenp, newp, MAXPARTITIONS));
case KERN_RAWPARTITION:
return (sysctl_rdint(oldp, oldlenp, newp, RAW_PART));
case KERN_SOMAXCONN:
return (sysctl_int(oldp, oldlenp, newp, newlen, &somaxconn));
case KERN_SOMINCONN:
return (sysctl_int(oldp, oldlenp, newp, newlen, &sominconn));
case KERN_USERMOUNT:
return (sysctl_int(oldp, oldlenp, newp, newlen, &usermount));
case KERN_RND:
return (sysctl_rdstruct(oldp, oldlenp, newp, &rndstats,
sizeof(rndstats)));
case KERN_ARND:
return (sysctl_rdint(oldp, oldlenp, newp, arc4random()));
case KERN_NOSUIDCOREDUMP:
return (sysctl_int(oldp, oldlenp, newp, newlen, &nosuidcoredump));
case KERN_FSYNC:
return (sysctl_rdint(oldp, oldlenp, newp, 1));
case KERN_SYSVMSG:
#ifdef SYSVMSG
return (sysctl_rdint(oldp, oldlenp, newp, 1));
#else
return (sysctl_rdint(oldp, oldlenp, newp, 0));
#endif
case KERN_SYSVSEM:
#ifdef SYSVSEM
return (sysctl_rdint(oldp, oldlenp, newp, 1));
#else
return (sysctl_rdint(oldp, oldlenp, newp, 0));
#endif
case KERN_SYSVSHM:
#ifdef SYSVSHM
return (sysctl_rdint(oldp, oldlenp, newp, 1));
#else
return (sysctl_rdint(oldp, oldlenp, newp, 0));
#endif
case KERN_MSGBUFSIZE:
/*
* deal with cases where the message buffer has
* become corrupted.
*/
if (!msgbufp || msgbufp->msg_magic != MSG_MAGIC)
return (ENXIO);
return (sysctl_rdint(oldp, oldlenp, newp, msgbufp->msg_bufs));
case KERN_MSGBUF:
/* see note above */
if (!msgbufp || msgbufp->msg_magic != MSG_MAGIC)
return (ENXIO);
return (sysctl_rdstruct(oldp, oldlenp, newp, msgbufp,
msgbufp->msg_bufs + offsetof(struct msgbuf, msg_bufc)));
case KERN_MALLOCSTATS:
return (sysctl_malloc(name + 1, namelen - 1, oldp, oldlenp,
newp, newlen, p));
case KERN_CPTIME:
return (sysctl_rdstruct(oldp, oldlenp, newp, &cp_time,
sizeof(cp_time)));
case KERN_NCHSTATS:
return (sysctl_rdstruct(oldp, oldlenp, newp, &nchstats,
sizeof(struct nchstats)));
case KERN_FORKSTAT:
return (sysctl_rdstruct(oldp, oldlenp, newp, &forkstat,
sizeof(struct forkstat)));
case KERN_TTY:
return (sysctl_tty(name + 1, namelen - 1, oldp, oldlenp,
newp, newlen));
case KERN_FSCALE:
return (sysctl_rdint(oldp, oldlenp, newp, fscale));
case KERN_CCPU:
return (sysctl_rdint(oldp, oldlenp, newp, ccpu));
case KERN_NPROCS:
return (sysctl_rdint(oldp, oldlenp, newp, nprocs));
case KERN_POOL:
return (sysctl_dopool(name + 1, namelen - 1, oldp, oldlenp));
case KERN_STACKGAPRANDOM:
oldsgap = stackgap_random;
error = sysctl_int(oldp, oldlenp, newp, newlen, &stackgap_random);
/*
* Safety harness.
*/
if ((stackgap_random < ALIGNBYTES && stackgap_random != 0) ||
!powerof2(stackgap_random) ||
stackgap_random > PAGE_SIZE * 2) {
stackgap_random = oldsgap;
return (EINVAL);
}
return (error);
#if defined(SYSVMSG) || defined(SYSVSEM) || defined(SYSVSHM)
case KERN_SYSVIPC_INFO:
return (sysctl_sysvipc(name + 1, namelen - 1, oldp, oldlenp));
#endif
#ifdef CRYPTO
case KERN_USERCRYPTO:
return (sysctl_int(oldp, oldlenp, newp, newlen, &usercrypto));
case KERN_USERASYMCRYPTO:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&userasymcrypto));
case KERN_CRYPTODEVALLOWSOFT:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&cryptodevallowsoft));
#endif
case KERN_SPLASSERT:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&splassert_ctl));
#ifdef SYSVSEM
case KERN_SEMINFO:
return (sysctl_sysvsem(name + 1, namelen - 1, oldp, oldlenp,
newp, newlen));
#endif
#ifdef SYSVSHM
case KERN_SHMINFO:
return (sysctl_sysvshm(name + 1, namelen - 1, oldp, oldlenp,
newp, newlen));
#endif
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
/*
* hardware related system variables.
*/
int
hw_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
extern char machine[], cpu_model[];
int err;
/* all sysctl names at this level are terminal */
if (namelen != 1)
return (ENOTDIR); /* overloaded */
switch (name[0]) {
case HW_MACHINE:
return (sysctl_rdstring(oldp, oldlenp, newp, machine));
case HW_MODEL:
return (sysctl_rdstring(oldp, oldlenp, newp, cpu_model));
case HW_NCPU:
return (sysctl_rdint(oldp, oldlenp, newp, 1)); /* XXX */
case HW_BYTEORDER:
return (sysctl_rdint(oldp, oldlenp, newp, BYTE_ORDER));
case HW_PHYSMEM:
return (sysctl_rdint(oldp, oldlenp, newp, ctob(physmem)));
case HW_USERMEM:
return (sysctl_rdint(oldp, oldlenp, newp,
ctob(physmem - uvmexp.wired)));
case HW_PAGESIZE:
return (sysctl_rdint(oldp, oldlenp, newp, PAGE_SIZE));
case HW_DISKNAMES:
err = sysctl_diskinit(0, p);
if (err)
return err;
if (disknames)
return (sysctl_rdstring(oldp, oldlenp, newp,
disknames));
else
return (sysctl_rdstring(oldp, oldlenp, newp, ""));
case HW_DISKSTATS:
err = sysctl_diskinit(1, p);
if (err)
return err;
return (sysctl_rdstruct(oldp, oldlenp, newp, diskstats,
disk_count * sizeof(struct diskstats)));
case HW_DISKCOUNT:
return (sysctl_rdint(oldp, oldlenp, newp, disk_count));
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
#ifdef DEBUG
/*
* Debugging related system variables.
*/
struct ctldebug debug0, debug1, debug2, debug3, debug4;
struct ctldebug debug5, debug6, debug7, debug8, debug9;
struct ctldebug debug10, debug11, debug12, debug13, debug14;
struct ctldebug debug15, debug16, debug17, debug18, debug19;
static struct ctldebug *debugvars[CTL_DEBUG_MAXID] = {
&debug0, &debug1, &debug2, &debug3, &debug4,
&debug5, &debug6, &debug7, &debug8, &debug9,
&debug10, &debug11, &debug12, &debug13, &debug14,
&debug15, &debug16, &debug17, &debug18, &debug19,
};
int
debug_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
struct ctldebug *cdp;
/* all sysctl names at this level are name and field */
if (namelen != 2)
return (ENOTDIR); /* overloaded */
cdp = debugvars[name[0]];
if (cdp->debugname == 0)
return (EOPNOTSUPP);
switch (name[1]) {
case CTL_DEBUG_NAME:
return (sysctl_rdstring(oldp, oldlenp, newp, cdp->debugname));
case CTL_DEBUG_VALUE:
return (sysctl_int(oldp, oldlenp, newp, newlen, cdp->debugvar));
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
#endif /* DEBUG */
/*
* Validate parameters and get old / set new parameters
* for an integer-valued sysctl function.
*/
int
sysctl_int(oldp, oldlenp, newp, newlen, valp)
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
int *valp;
{
int error = 0;
if (oldp && *oldlenp < sizeof(int))
return (ENOMEM);
if (newp && newlen != sizeof(int))
return (EINVAL);
*oldlenp = sizeof(int);
if (oldp)
error = copyout(valp, oldp, sizeof(int));
if (error == 0 && newp)
error = copyin(newp, valp, sizeof(int));
return (error);
}
/*
* As above, but read-only.
*/
int
sysctl_rdint(oldp, oldlenp, newp, val)
void *oldp;
size_t *oldlenp;
void *newp;
int val;
{
int error = 0;
if (oldp && *oldlenp < sizeof(int))
return (ENOMEM);
if (newp)
return (EPERM);
*oldlenp = sizeof(int);
if (oldp)
error = copyout((caddr_t)&val, oldp, sizeof(int));
return (error);
}
/*
* Validate parameters and get old / set new parameters
* for an integer-valued sysctl function.
*/
int
sysctl_quad(oldp, oldlenp, newp, newlen, valp)
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
int64_t *valp;
{
int error = 0;
if (oldp && *oldlenp < sizeof(int64_t))
return (ENOMEM);
if (newp && newlen != sizeof(int64_t))
return (EINVAL);
*oldlenp = sizeof(int64_t);
if (oldp)
error = copyout(valp, oldp, sizeof(int64_t));
if (error == 0 && newp)
error = copyin(newp, valp, sizeof(int64_t));
return (error);
}
/*
* As above, but read-only.
*/
int
sysctl_rdquad(oldp, oldlenp, newp, val)
void *oldp;
size_t *oldlenp;
void *newp;
int64_t val;
{
int error = 0;
if (oldp && *oldlenp < sizeof(int64_t))
return (ENOMEM);
if (newp)
return (EPERM);
*oldlenp = sizeof(int64_t);
if (oldp)
error = copyout((caddr_t)&val, oldp, sizeof(int64_t));
return (error);
}
/*
* Validate parameters and get old / set new parameters
* for a string-valued sysctl function.
*/
int
sysctl_string(oldp, oldlenp, newp, newlen, str, maxlen)
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
char *str;
int maxlen;
{
return sysctl__string(oldp, oldlenp, newp, newlen, str, maxlen, 0);
}
int
sysctl_tstring(oldp, oldlenp, newp, newlen, str, maxlen)
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
char *str;
int maxlen;
{
return sysctl__string(oldp, oldlenp, newp, newlen, str, maxlen, 1);
}
int
sysctl__string(oldp, oldlenp, newp, newlen, str, maxlen, trunc)
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
char *str;
int maxlen;
int trunc;
{
int len, error = 0;
char c;
len = strlen(str) + 1;
if (oldp && *oldlenp < len) {
if (trunc == 0 || *oldlenp == 0)
return (ENOMEM);
}
if (newp && newlen >= maxlen)
return (EINVAL);
if (oldp) {
if (trunc && *oldlenp < len) {
/* save & zap NUL terminator while copying */
c = str[*oldlenp-1];
str[*oldlenp-1] = '\0';
error = copyout(str, oldp, *oldlenp);
str[*oldlenp-1] = c;
} else {
*oldlenp = len;
error = copyout(str, oldp, len);
}
}
if (error == 0 && newp) {
error = copyin(newp, str, newlen);
str[newlen] = 0;
}
return (error);
}
/*
* As above, but read-only.
*/
int
sysctl_rdstring(oldp, oldlenp, newp, str)
void *oldp;
size_t *oldlenp;
void *newp;
const char *str;
{
int len, error = 0;
len = strlen(str) + 1;
if (oldp && *oldlenp < len)
return (ENOMEM);
if (newp)
return (EPERM);
*oldlenp = len;
if (oldp)
error = copyout(str, oldp, len);
return (error);
}
/*
* Validate parameters and get old / set new parameters
* for a structure oriented sysctl function.
*/
int
sysctl_struct(oldp, oldlenp, newp, newlen, sp, len)
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
void *sp;
int len;
{
int error = 0;
if (oldp && *oldlenp < len)
return (ENOMEM);
if (newp && newlen > len)
return (EINVAL);
if (oldp) {
*oldlenp = len;
error = copyout(sp, oldp, len);
}
if (error == 0 && newp)
error = copyin(newp, sp, len);
return (error);
}
/*
* Validate parameters and get old parameters
* for a structure oriented sysctl function.
*/
int
sysctl_rdstruct(oldp, oldlenp, newp, sp, len)
void *oldp;
size_t *oldlenp;
void *newp;
const void *sp;
int len;
{
int error = 0;
if (oldp && *oldlenp < len)
return (ENOMEM);
if (newp)
return (EPERM);
*oldlenp = len;
if (oldp)
error = copyout(sp, oldp, len);
return (error);
}
/*
* Get file structures.
*/
int
sysctl_file(where, sizep)
char *where;
size_t *sizep;
{
int buflen, error;
struct file *fp;
char *start = where;
buflen = *sizep;
if (where == NULL) {
/*
* overestimate by 10 files
*/
*sizep = sizeof(filehead) + (nfiles + 10) * sizeof(struct file);
return (0);
}
/*
* first copyout filehead
*/
if (buflen < sizeof(filehead)) {
*sizep = 0;
return (0);
}
error = copyout((caddr_t)&filehead, where, sizeof(filehead));
if (error)
return (error);
buflen -= sizeof(filehead);
where += sizeof(filehead);
/*
* followed by an array of file structures
*/
LIST_FOREACH(fp, &filehead, f_list) {
if (buflen < sizeof(struct file)) {
*sizep = where - start;
return (ENOMEM);
}
error = copyout((caddr_t)fp, where, sizeof (struct file));
if (error)
return (error);
buflen -= sizeof(struct file);
where += sizeof(struct file);
}
*sizep = where - start;
return (0);
}
/*
* try over estimating by 5 procs
*/
#define KERN_PROCSLOP (5 * sizeof (struct kinfo_proc))
int
sysctl_doproc(name, namelen, where, sizep)
int *name;
u_int namelen;
char *where;
size_t *sizep;
{
register struct proc *p;
register struct kinfo_proc *dp = (struct kinfo_proc *)where;
register int needed = 0;
int buflen = where != NULL ? *sizep : 0;
int doingzomb;
struct eproc eproc;
int error = 0;
if (namelen != 2 && !(namelen == 1 &&
(name[0] == KERN_PROC_ALL || name[0] == KERN_PROC_KTHREAD)))
return (EINVAL);
p = LIST_FIRST(&allproc);
doingzomb = 0;
again:
for (; p != 0; p = LIST_NEXT(p, p_list)) {
/*
* Skip embryonic processes.
*/
if (p->p_stat == SIDL)
continue;
/*
* TODO - make more efficient (see notes below).
* do by session.
*/
switch (name[0]) {
case KERN_PROC_PID:
/* could do this with just a lookup */
if (p->p_pid != (pid_t)name[1])
continue;
break;
case KERN_PROC_PGRP:
/* could do this by traversing pgrp */
if (p->p_pgrp->pg_id != (pid_t)name[1])
continue;
break;
case KERN_PROC_TTY:
if ((p->p_flag & P_CONTROLT) == 0 ||
p->p_session->s_ttyp == NULL ||
p->p_session->s_ttyp->t_dev != (dev_t)name[1])
continue;
break;
case KERN_PROC_UID:
if (p->p_ucred->cr_uid != (uid_t)name[1])
continue;
break;
case KERN_PROC_RUID:
if (p->p_cred->p_ruid != (uid_t)name[1])
continue;
break;
case KERN_PROC_ALL:
if (p->p_flag & P_SYSTEM)
continue;
break;
}
if (buflen >= sizeof(struct kinfo_proc)) {
fill_eproc(p, &eproc);
error = copyout((caddr_t)p, &dp->kp_proc,
sizeof(struct proc));
if (error)
return (error);
error = copyout((caddr_t)&eproc, &dp->kp_eproc,
sizeof(eproc));
if (error)
return (error);
dp++;
buflen -= sizeof(struct kinfo_proc);
}
needed += sizeof(struct kinfo_proc);
}
if (doingzomb == 0) {
p = LIST_FIRST(&zombproc);
doingzomb++;
goto again;
}
if (where != NULL) {
*sizep = (caddr_t)dp - where;
if (needed > *sizep)
return (ENOMEM);
} else {
needed += KERN_PROCSLOP;
*sizep = needed;
}
return (0);
}
/*
* Fill in an eproc structure for the specified process.
*/
void
fill_eproc(struct proc *p, struct eproc *ep)
{
struct tty *tp;
ep->e_paddr = p;
ep->e_sess = p->p_pgrp->pg_session;
ep->e_pcred = *p->p_cred;
ep->e_ucred = *p->p_ucred;
if (p->p_stat == SIDL || P_ZOMBIE(p)) {
ep->e_vm.vm_rssize = 0;
ep->e_vm.vm_tsize = 0;
ep->e_vm.vm_dsize = 0;
ep->e_vm.vm_ssize = 0;
bzero(&ep->e_pstats, sizeof(ep->e_pstats));
ep->e_pstats_valid = 0;
} else {
struct vmspace *vm = p->p_vmspace;
PHOLD(p); /* need for pstats */
ep->e_vm.vm_rssize = vm_resident_count(vm);
ep->e_vm.vm_tsize = vm->vm_tsize;
ep->e_vm.vm_dsize = vm->vm_dsize;
ep->e_vm.vm_ssize = vm->vm_ssize;
ep->e_pstats = *p->p_stats;
ep->e_pstats_valid = 1;
PRELE(p);
}
if (p->p_pptr)
ep->e_ppid = p->p_pptr->p_pid;
else
ep->e_ppid = 0;
ep->e_pgid = p->p_pgrp->pg_id;
ep->e_jobc = p->p_pgrp->pg_jobc;
if ((p->p_flag & P_CONTROLT) &&
(tp = ep->e_sess->s_ttyp)) {
ep->e_tdev = tp->t_dev;
ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
ep->e_tsess = tp->t_session;
} else
ep->e_tdev = NODEV;
ep->e_flag = ep->e_sess->s_ttyvp ? EPROC_CTTY : 0;
if (SESS_LEADER(p))
ep->e_flag |= EPROC_SLEADER;
strncpy(ep->e_wmesg, p->p_wmesg ? p->p_wmesg : "", WMESGLEN);
ep->e_wmesg[WMESGLEN] = '\0';
ep->e_xsize = ep->e_xrssize = 0;
ep->e_xccount = ep->e_xswrss = 0;
strncpy(ep->e_login, ep->e_sess->s_login, MAXLOGNAME-1);
ep->e_login[MAXLOGNAME-1] = '\0';
strncpy(ep->e_emul, p->p_emul->e_name, EMULNAMELEN);
ep->e_emul[EMULNAMELEN] = '\0';
ep->e_maxrss = p->p_rlimit ? p->p_rlimit[RLIMIT_RSS].rlim_cur : 0;
}
int
sysctl_proc_args(int *name, u_int namelen, void *oldp, size_t *oldlenp,
struct proc *cp)
{
struct proc *vp;
pid_t pid;
int op;
struct ps_strings pss;
struct iovec iov;
struct uio uio;
int error;
size_t limit;
int cnt;
char **rargv, **vargv; /* reader vs. victim */
char *rarg, *varg;
char *buf;
if (namelen > 2)
return (ENOTDIR);
if (namelen < 2)
return (EINVAL);
pid = name[0];
op = name[1];
switch (op) {
case KERN_PROC_ARGV:
case KERN_PROC_NARGV:
case KERN_PROC_ENV:
case KERN_PROC_NENV:
break;
default:
return (EOPNOTSUPP);
}
if ((vp = pfind(pid)) == NULL)
return (ESRCH);
if (P_ZOMBIE(vp) || (vp->p_flag & P_SYSTEM))
return (EINVAL);
/* Exiting - don't bother, it will be gone soon anyway */
if ((vp->p_flag & P_WEXIT))
return (ESRCH);
/* Execing - danger. */
if ((vp->p_flag & P_INEXEC))
return (EBUSY);
vp->p_vmspace->vm_refcnt++; /* XXX */
buf = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
iov.iov_base = &pss;
iov.iov_len = sizeof(pss);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = (off_t)PS_STRINGS;
uio.uio_resid = sizeof(pss);
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_procp = cp;
if ((error = uvm_io(&vp->p_vmspace->vm_map, &uio)) != 0)
goto out;
if (op == KERN_PROC_NARGV) {
error = sysctl_rdint(oldp, oldlenp, NULL, pss.ps_nargvstr);
goto out;
}
if (op == KERN_PROC_NENV) {
error = sysctl_rdint(oldp, oldlenp, NULL, pss.ps_nenvstr);
goto out;
}
if (op == KERN_PROC_ARGV) {
cnt = pss.ps_nargvstr;
vargv = pss.ps_argvstr;
} else {
cnt = pss.ps_nenvstr;
vargv = pss.ps_envstr;
}
/* -1 to have space for a terminating NUL */
limit = *oldlenp - 1;
*oldlenp = 0;
if (limit > 8 * PAGE_SIZE) {
/* Don't allow a denial of service. */
error = E2BIG;
goto out;
}
rargv = oldp;
/*
* *oldlenp - number of bytes copied out into readers buffer.
* limit - maximal number of bytes allowed into readers buffer.
* rarg - pointer into readers buffer where next arg will be stored.
* rargv - pointer into readers buffer where the next rarg pointer
* will be stored.
* vargv - pointer into victim address space where the next argument
* will be read.
*/
/* space for cnt pointers and a NULL */
rarg = (char *)(rargv + cnt + 1);
*oldlenp += (cnt + 1) * sizeof(char **);
while (cnt > 0 && *oldlenp < limit) {
size_t len, vstrlen;
/* Write to readers argv */
if ((error = copyout(&rarg, rargv, sizeof(rarg))) != 0)
goto out;
/* read the victim argv */
iov.iov_base = &varg;
iov.iov_len = sizeof(varg);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = (off_t)(vaddr_t)vargv;
uio.uio_resid = sizeof(varg);
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_procp = cp;
if ((error = uvm_io(&vp->p_vmspace->vm_map, &uio)) != 0)
goto out;
if (varg == NULL)
break;
/*
* read the victim arg. We must jump through hoops to avoid
* crossing a page boundary too much and returning an error.
*/
more:
len = PAGE_SIZE - (((vaddr_t)varg) & PAGE_MASK);
/* leave space for the terminating NUL */
iov.iov_base = buf;
iov.iov_len = len;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = (off_t)(vaddr_t)varg;
uio.uio_resid = len;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_procp = cp;
if ((error = uvm_io(&vp->p_vmspace->vm_map, &uio)) != 0)
goto out;
for (vstrlen = 0; vstrlen < len; vstrlen++) {
if (buf[vstrlen] == '\0')
break;
}
/* Don't overflow readers buffer. */
if (*oldlenp + vstrlen + 1 >= limit) {
error = ENOMEM;
goto out;
}
if ((error = copyout(buf, rarg, vstrlen)) != 0)
goto out;
*oldlenp += vstrlen;
rarg += vstrlen;
/* The string didn't end in this page? */
if (vstrlen == len) {
varg += vstrlen;
goto more;
}
/* End of string. Terminate it with a NUL */
buf[0] = '\0';
if ((error = copyout(buf, rarg, 1)) != 0)
goto out;
*oldlenp += 1;;
rarg += 1;
vargv++;
rargv++;
cnt--;
}
if (*oldlenp >= limit) {
error = ENOMEM;
goto out;
}
/* Write the terminating null */
rarg = NULL;
error = copyout(&rarg, rargv, sizeof(rarg));
out:
uvmspace_free(vp->p_vmspace);
free(buf, M_TEMP);
return (error);
}
/*
* Initialize disknames/diskstats for export by sysctl. If update is set,
* then we simply update the disk statistics information.
*/
int
sysctl_diskinit(update, p)
int update;
struct proc *p;
{
struct diskstats *sdk;
struct disk *dk;
int i, tlen, l;
if ((i = lockmgr(&sysctl_disklock, LK_EXCLUSIVE, NULL, p)) != 0)
return i;
if (disk_change) {
for (dk = TAILQ_FIRST(&disklist), tlen = 0; dk;
dk = TAILQ_NEXT(dk, dk_link))
tlen += strlen(dk->dk_name) + 1;
tlen++;
if (disknames)
free(disknames, M_SYSCTL);
if (diskstats)
free(diskstats, M_SYSCTL);
diskstats = NULL;
disknames = NULL;
diskstats = malloc(disk_count * sizeof(struct diskstats),
M_SYSCTL, M_WAITOK);
disknames = malloc(tlen, M_SYSCTL, M_WAITOK);
disknames[0] = '\0';
for (dk = TAILQ_FIRST(&disklist), i = 0, l = 0; dk;
dk = TAILQ_NEXT(dk, dk_link), i++) {
l += sprintf(disknames + l, "%s,",
dk->dk_name ? dk->dk_name : "");
sdk = diskstats + i;
sdk->ds_busy = dk->dk_busy;
sdk->ds_xfer = dk->dk_xfer;
sdk->ds_seek = dk->dk_seek;
sdk->ds_bytes = dk->dk_bytes;
sdk->ds_attachtime = dk->dk_attachtime;
sdk->ds_timestamp = dk->dk_timestamp;
sdk->ds_time = dk->dk_time;
}
/* Eliminate trailing comma */
if (l != 0)
disknames[l - 1] = '\0';
disk_change = 0;
} else if (update) {
/* Just update, number of drives hasn't changed */
for (dk = TAILQ_FIRST(&disklist), i = 0; dk;
dk = TAILQ_NEXT(dk, dk_link), i++) {
sdk = diskstats + i;
sdk->ds_busy = dk->dk_busy;
sdk->ds_xfer = dk->dk_xfer;
sdk->ds_seek = dk->dk_seek;
sdk->ds_bytes = dk->dk_bytes;
sdk->ds_attachtime = dk->dk_attachtime;
sdk->ds_timestamp = dk->dk_timestamp;
sdk->ds_time = dk->dk_time;
}
}
lockmgr(&sysctl_disklock, LK_RELEASE, NULL, p);
return 0;
}
#if defined(SYSVMSG) || defined(SYSVSEM) || defined(SYSVSHM)
int
sysctl_sysvipc(name, namelen, where, sizep)
int *name;
u_int namelen;
void *where;
size_t *sizep;
{
#ifdef SYSVMSG
struct msg_sysctl_info *msgsi;
#endif
#ifdef SYSVSEM
struct sem_sysctl_info *semsi;
#endif
#ifdef SYSVSHM
struct shm_sysctl_info *shmsi;
#endif
size_t infosize, dssize, tsize, buflen;
int i, nds, error, ret;
void *buf;
if (namelen != 1)
return (EINVAL);
buflen = *sizep;
switch (*name) {
case KERN_SYSVIPC_MSG_INFO:
#ifdef SYSVMSG
infosize = sizeof(msgsi->msginfo);
nds = msginfo.msgmni;
dssize = sizeof(msgsi->msgids[0]);
break;
#else
return (EOPNOTSUPP);
#endif
case KERN_SYSVIPC_SEM_INFO:
#ifdef SYSVSEM
infosize = sizeof(semsi->seminfo);
nds = seminfo.semmni;
dssize = sizeof(semsi->semids[0]);
break;
#else
return (EOPNOTSUPP);
#endif
case KERN_SYSVIPC_SHM_INFO:
#ifdef SYSVSHM
infosize = sizeof(shmsi->shminfo);
nds = shminfo.shmmni;
dssize = sizeof(shmsi->shmids[0]);
break;
#else
return (EOPNOTSUPP);
#endif
default:
return (EINVAL);
}
tsize = infosize + (nds * dssize);
/* Return just the total size required. */
if (where == NULL) {
*sizep = tsize;
return (0);
}
/* Not enough room for even the info struct. */
if (buflen < infosize) {
*sizep = 0;
return (ENOMEM);
}
buf = malloc(min(tsize, buflen), M_TEMP, M_WAITOK);
bzero(buf, min(tsize, buflen));
switch (*name) {
#ifdef SYSVMSG
case KERN_SYSVIPC_MSG_INFO:
msgsi = (struct msg_sysctl_info *)buf;
msgsi->msginfo = msginfo;
break;
#endif
#ifdef SYSVSEM
case KERN_SYSVIPC_SEM_INFO:
semsi = (struct sem_sysctl_info *)buf;
semsi->seminfo = seminfo;
break;
#endif
#ifdef SYSVSHM
case KERN_SYSVIPC_SHM_INFO:
shmsi = (struct shm_sysctl_info *)buf;
shmsi->shminfo = shminfo;
break;
#endif
}
buflen -= infosize;
ret = 0;
if (buflen > 0) {
/* Fill in the IPC data structures. */
for (i = 0; i < nds; i++) {
if (buflen < dssize) {
ret = ENOMEM;
break;
}
switch (*name) {
#ifdef SYSVMSG
case KERN_SYSVIPC_MSG_INFO:
bcopy(&msqids[i], &msgsi->msgids[i], dssize);
break;
#endif
#ifdef SYSVSEM
case KERN_SYSVIPC_SEM_INFO:
if (sema[i] != NULL)
bcopy(sema[i], &semsi->semids[i],
dssize);
else
bzero(&semsi->semids[i], dssize);
break;
#endif
#ifdef SYSVSHM
case KERN_SYSVIPC_SHM_INFO:
if (shmsegs[i] != NULL)
bcopy(shmsegs[i], &shmsi->shmids[i],
dssize);
else
bzero(&shmsi->shmids[i], dssize);
break;
#endif
}
buflen -= dssize;
}
}
*sizep -= buflen;
error = copyout(buf, where, *sizep);
free(buf, M_TEMP);
/* If copyout succeeded, use return code set earlier. */
return (error ? error : ret);
}
#endif /* SYSVMSG || SYSVSEM || SYSVSHM */
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