/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 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.
*
* The split of ipcs.c into ipcs.c and ipc.c to accommodate the
* changes in ipcrm.c was done by Edwin Groothuis <edwin@FreeBSD.org>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/sysctl.h>
#define _WANT_SYSVMSG_INTERNALS
#include <sys/msg.h>
#define _WANT_SYSVSEM_INTERNALS
#include <sys/sem.h>
#define _WANT_SYSVSHM_INTERNALS
#include <sys/shm.h>
#include <assert.h>
#include <err.h>
#include <kvm.h>
#include <nlist.h>
#include <stddef.h>
#include "ipc.h"
int use_sysctl = 1;
struct semid_kernel *sema;
struct seminfo seminfo;
struct msginfo msginfo;
struct msqid_kernel *msqids;
struct shminfo shminfo;
struct shmid_kernel *shmsegs;
struct nlist symbols[] = {
{ .n_name = "sema" },
{ .n_name = "seminfo" },
{ .n_name = "msginfo" },
{ .n_name = "msqids" },
{ .n_name = "shminfo" },
{ .n_name = "shmsegs" },
{ .n_name = NULL }
};
#define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \
X(shmmin, sizeof(u_long)) \
X(shmmni, sizeof(u_long)) \
X(shmseg, sizeof(u_long)) \
X(shmall, sizeof(u_long))
#define SEMINFO_XVEC X(semmni, sizeof(int)) \
X(semmns, sizeof(int)) \
X(semmnu, sizeof(int)) \
X(semmsl, sizeof(int)) \
X(semopm, sizeof(int)) \
X(semume, sizeof(int)) \
X(semusz, sizeof(int)) \
X(semvmx, sizeof(int)) \
X(semaem, sizeof(int))
#define MSGINFO_XVEC X(msgmax, sizeof(int)) \
X(msgmni, sizeof(int)) \
X(msgmnb, sizeof(int)) \
X(msgtql, sizeof(int)) \
X(msgssz, sizeof(int)) \
X(msgseg, sizeof(int))
#define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) },
#define TYPEC struct shminfo
static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } };
#undef TYPEC
#define TYPEC struct seminfo
static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } };
#undef TYPEC
#define TYPEC struct msginfo
static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } };
#undef TYPEC
#undef X
kvm_t *kd;
void
sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr)
{
struct scgs_vector *xp;
size_t tsiz;
int rv;
for (xp = vecarr; xp->sysctl != NULL; xp++) {
assert(xp->offset <= size);
tsiz = xp->size;
rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset,
&tsiz, NULL, 0);
if (rv == -1)
err(1, "sysctlbyname: %s", xp->sysctl);
if (tsiz != xp->size)
errx(1, "%s size mismatch (expected %zu, got %zu)",
xp->sysctl, xp->size, tsiz);
}
}
void
kget(int idx, void *addr, size_t size)
{
const char *symn; /* symbol name */
size_t tsiz;
int rv;
unsigned long kaddr;
const char *sym2sysctl[] = { /* symbol to sysctl name table */
"kern.ipc.sema",
"kern.ipc.seminfo",
"kern.ipc.msginfo",
"kern.ipc.msqids",
"kern.ipc.shminfo",
"kern.ipc.shmsegs" };
assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl));
if (!use_sysctl) {
symn = symbols[idx].n_name;
if (*symn == '_')
symn++;
if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0)
errx(1, "symbol %s undefined", symn);
/*
* For some symbols, the value we retrieve is
* actually a pointer; since we want the actual value,
* we have to manually dereference it.
*/
switch (idx) {
case X_MSQIDS:
tsiz = sizeof(msqids);
rv = kvm_read(kd, symbols[idx].n_value,
&msqids, tsiz);
kaddr = (u_long)msqids;
break;
case X_SHMSEGS:
tsiz = sizeof(shmsegs);
rv = kvm_read(kd, symbols[idx].n_value,
&shmsegs, tsiz);
kaddr = (u_long)shmsegs;
break;
case X_SEMA:
tsiz = sizeof(sema);
rv = kvm_read(kd, symbols[idx].n_value,
&sema, tsiz);
kaddr = (u_long)sema;
break;
default:
rv = tsiz = 0;
kaddr = symbols[idx].n_value;
break;
}
if ((unsigned)rv != tsiz)
errx(1, "%s: %s", symn, kvm_geterr(kd));
if ((unsigned)kvm_read(kd, kaddr, addr, size) != size)
errx(1, "%s: %s", symn, kvm_geterr(kd));
} else {
switch (idx) {
case X_SHMINFO:
sysctlgatherstruct(addr, size, shminfo_scgsv);
break;
case X_SEMINFO:
sysctlgatherstruct(addr, size, seminfo_scgsv);
break;
case X_MSGINFO:
sysctlgatherstruct(addr, size, msginfo_scgsv);
break;
default:
tsiz = size;
rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz,
NULL, 0);
if (rv == -1)
err(1, "sysctlbyname: %s", sym2sysctl[idx]);
if (tsiz != size)
errx(1, "%s size mismatch "
"(expected %zu, got %zu)",
sym2sysctl[idx], size, tsiz);
break;
}
}
}
