206 lines
5.9 KiB
C
206 lines
5.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The split of ipcs.c into ipcs.c and ipc.c to accommodate the
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* changes in ipcrm.c was done by Edwin Groothuis <edwin@FreeBSD.org>
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#define _WANT_SYSVMSG_INTERNALS
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#include <sys/msg.h>
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#define _WANT_SYSVSEM_INTERNALS
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#include <sys/sem.h>
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#define _WANT_SYSVSHM_INTERNALS
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#include <sys/shm.h>
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#include <assert.h>
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#include <err.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <stddef.h>
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#include "ipc.h"
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int use_sysctl = 1;
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struct semid_kernel *sema;
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struct seminfo seminfo;
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struct msginfo msginfo;
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struct msqid_kernel *msqids;
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struct shminfo shminfo;
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struct shmid_kernel *shmsegs;
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struct nlist symbols[] = {
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{ .n_name = "sema" },
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{ .n_name = "seminfo" },
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{ .n_name = "msginfo" },
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{ .n_name = "msqids" },
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{ .n_name = "shminfo" },
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{ .n_name = "shmsegs" },
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{ .n_name = NULL }
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};
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#define SHMINFO_XVEC X(shmmax, sizeof(u_long)) \
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X(shmmin, sizeof(u_long)) \
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X(shmmni, sizeof(u_long)) \
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X(shmseg, sizeof(u_long)) \
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X(shmall, sizeof(u_long))
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#define SEMINFO_XVEC X(semmni, sizeof(int)) \
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X(semmns, sizeof(int)) \
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X(semmnu, sizeof(int)) \
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X(semmsl, sizeof(int)) \
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X(semopm, sizeof(int)) \
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X(semume, sizeof(int)) \
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X(semusz, sizeof(int)) \
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X(semvmx, sizeof(int)) \
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X(semaem, sizeof(int))
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#define MSGINFO_XVEC X(msgmax, sizeof(int)) \
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X(msgmni, sizeof(int)) \
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X(msgmnb, sizeof(int)) \
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X(msgtql, sizeof(int)) \
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X(msgssz, sizeof(int)) \
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X(msgseg, sizeof(int))
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#define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) },
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#define TYPEC struct shminfo
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static struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { .sysctl=NULL } };
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#undef TYPEC
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#define TYPEC struct seminfo
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static struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { .sysctl=NULL } };
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#undef TYPEC
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#define TYPEC struct msginfo
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static struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { .sysctl=NULL } };
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#undef TYPEC
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#undef X
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kvm_t *kd;
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void
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sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr)
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{
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struct scgs_vector *xp;
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size_t tsiz;
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int rv;
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for (xp = vecarr; xp->sysctl != NULL; xp++) {
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assert(xp->offset <= size);
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tsiz = xp->size;
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rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset,
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&tsiz, NULL, 0);
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if (rv == -1)
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err(1, "sysctlbyname: %s", xp->sysctl);
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if (tsiz != xp->size)
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errx(1, "%s size mismatch (expected %zu, got %zu)",
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xp->sysctl, xp->size, tsiz);
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}
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}
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void
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kget(int idx, void *addr, size_t size)
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{
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const char *symn; /* symbol name */
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size_t tsiz;
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int rv;
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unsigned long kaddr;
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const char *sym2sysctl[] = { /* symbol to sysctl name table */
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"kern.ipc.sema",
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"kern.ipc.seminfo",
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"kern.ipc.msginfo",
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"kern.ipc.msqids",
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"kern.ipc.shminfo",
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"kern.ipc.shmsegs" };
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assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl));
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if (!use_sysctl) {
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symn = symbols[idx].n_name;
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if (*symn == '_')
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symn++;
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if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0)
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errx(1, "symbol %s undefined", symn);
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/*
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* For some symbols, the value we retrieve is
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* actually a pointer; since we want the actual value,
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* we have to manually dereference it.
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*/
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switch (idx) {
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case X_MSQIDS:
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tsiz = sizeof(msqids);
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rv = kvm_read(kd, symbols[idx].n_value,
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&msqids, tsiz);
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kaddr = (u_long)msqids;
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break;
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case X_SHMSEGS:
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tsiz = sizeof(shmsegs);
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rv = kvm_read(kd, symbols[idx].n_value,
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&shmsegs, tsiz);
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kaddr = (u_long)shmsegs;
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break;
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case X_SEMA:
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tsiz = sizeof(sema);
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rv = kvm_read(kd, symbols[idx].n_value,
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&sema, tsiz);
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kaddr = (u_long)sema;
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break;
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default:
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rv = tsiz = 0;
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kaddr = symbols[idx].n_value;
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break;
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}
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if ((unsigned)rv != tsiz)
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errx(1, "%s: %s", symn, kvm_geterr(kd));
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if ((unsigned)kvm_read(kd, kaddr, addr, size) != size)
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errx(1, "%s: %s", symn, kvm_geterr(kd));
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} else {
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switch (idx) {
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case X_SHMINFO:
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sysctlgatherstruct(addr, size, shminfo_scgsv);
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break;
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case X_SEMINFO:
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sysctlgatherstruct(addr, size, seminfo_scgsv);
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break;
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case X_MSGINFO:
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sysctlgatherstruct(addr, size, msginfo_scgsv);
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break;
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default:
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tsiz = size;
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rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz,
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NULL, 0);
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if (rv == -1)
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err(1, "sysctlbyname: %s", sym2sysctl[idx]);
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if (tsiz != size)
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errx(1, "%s size mismatch "
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"(expected %zu, got %zu)",
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sym2sysctl[idx], size, tsiz);
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break;
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}
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}
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}
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