/*      $NetBSD: ipcrm.c,v 1.17 2025/11/28 14:46:32 nia Exp $   */

/*
 * Copyright (c) 1994 Adam Glass
 * 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 BY Adam Glass ``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 Adam Glass 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.
 */

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <err.h>
#include <signal.h>
#include <sys/sysctl.h>

#define IPC_TO_STR(x) (x == 'Q' ? "msq" : (x == 'M' ? "shm" : "sem"))
#define IPC_TO_STRING(x) (x == 'Q' ? "message queue" : \
        (x == 'M' ? "shared memory segment" : "semaphore"))

static sig_atomic_t signaled;

static void     usage(void) __dead;
static int      msgrm(key_t, int);
static int      shmrm(key_t, int);
static int      semrm(key_t, int);
static int      msgrmall(void);
static int      shmrmall(void);
static int      semrmall(void);
static void     not_configured(int);

static void 
usage(void)
{
        (void)fprintf(stderr, "Usage: %s [-M shmkey] [-m shmid] [-Q msgkey]\n",
            getprogname());
        (void)fprintf(stderr, "\t[-q msqid] [-S semkey] [-s semid] ...\n");
        exit(1);
}

static int 
msgrm(key_t key, int id)
{
        if (key) {
                id = msgget(key, 0);
                if (id == -1)
                        return -1;
        }
        return msgctl(id, IPC_RMID, NULL);
}

static int 
shmrm(key_t key, int id)
{
        if (key) {
                id = shmget(key, 0, 0);
                if (id == -1)
                        return -1;
        }
        return shmctl(id, IPC_RMID, NULL);
}

static int 
semrm(key_t key, int id)
{

        if (key) {
                id = semget(key, 0, 0);
                if (id == -1)
                        return -1;
        }
        return semctl(id, 0, IPC_RMID, NULL);
}

static int
msgrmall(void)
{
        int mib[4];
        struct msg_sysctl_info *msgsi;
        int32_t i;
        size_t len;
        int result = 0;

        mib[0] = CTL_KERN;
        mib[1] = KERN_SYSVIPC;
        mib[2] = KERN_SYSVIPC_INFO;
        mib[3] = KERN_SYSVIPC_MSG_INFO;

        if (sysctl(mib, 4, NULL, &len, NULL, 0) == -1)
                err(1, "sysctl(KERN_SYSVIPC_MSG_INFO)");

        if ((msgsi = malloc(len)) == NULL)
                err(1, "malloc");
        if (sysctl(mib, 4, msgsi, &len, NULL, 0) == -1) {
                free(msgsi);
                err(1, "sysctl(KERN_SYSVIPC_MSG_INFO)");
        }

        for (i = 0; i < msgsi->msginfo.msgmni; i++) {
                struct msgid_ds_sysctl *msgptr = &msgsi->msgids[i];
                if (msgptr->msg_qbytes != 0)
                        result -= msgrm((key_t)0,
                            (int)IXSEQ_TO_IPCID(i, msgptr->msg_perm));
        }
        free(msgsi);
        return result;
}

static int
shmrmall(void)
{
        int mib[4];
        struct shm_sysctl_info *shmsi;
        size_t i, len;
        int result = 0;

        mib[0] = CTL_KERN;
        mib[1] = KERN_SYSVIPC;
        mib[2] = KERN_SYSVIPC_INFO;
        mib[3] = KERN_SYSVIPC_SHM_INFO;

        if (sysctl(mib, 4, NULL, &len, NULL, 0) == -1)
                err(1, "sysctl(KERN_SYSVIPC_SHM_INFO)");

        if ((shmsi = malloc(len)) == NULL)
                err(1, "malloc");
        if (sysctl(mib, 4, shmsi, &len, NULL, 0) == -1) {
                free(shmsi);
                err(1, "sysctl(KERN_SYSVIPC_SHM_INFO)");
        }

        for (i = 0; i < shmsi->shminfo.shmmni; i++) {
                struct shmid_ds_sysctl *shmptr = &shmsi->shmids[i];
                if (shmptr->shm_perm.mode & 0x0800)
                        result -= shmrm((key_t)0,
                            (int)IXSEQ_TO_IPCID(i, shmptr->shm_perm));
        }
        free(shmsi);
        return result;
}

static int
semrmall(void)
{
        int mib[4];
        struct sem_sysctl_info *semsi;
        size_t len;
        int32_t i;
        int result = 0;

        mib[0] = CTL_KERN;
        mib[1] = KERN_SYSVIPC;
        mib[2] = KERN_SYSVIPC_INFO;
        mib[3] = KERN_SYSVIPC_SEM_INFO;

        if (sysctl(mib, 4, NULL, &len, NULL, 0) == -1)
                err(1, "sysctl(KERN_SYSVIPC_SEM_INFO)");

        if ((semsi = malloc(len)) == NULL)
                err(1, "malloc");
        if (sysctl(mib, 4, semsi, &len, NULL, 0) == -1) {
                free(semsi);
                err(1, "sysctl(KERN_SYSVIPC_SEM_INFO)");
        }

        for (i = 0; i < semsi->seminfo.semmni; i++) {
                struct semid_ds_sysctl *semptr = &semsi->semids[i];
                if ((semptr->sem_perm.mode & SEM_ALLOC) != 0)
                        result -= semrm((key_t)0,
                            (int)IXSEQ_TO_IPCID(i, semptr->sem_perm));
        }
        free(semsi);
        return result;
}

static void 
/*ARGSUSED*/
not_configured(int n)
{
        signaled++;
}

int 
main(int argc, char *argv[])
{
        int     c, result, errflg, target_id;
        key_t   target_key;

        setprogname(argv[0]);
        errflg = 0;
        (void)signal(SIGSYS, not_configured);
        while ((c = getopt(argc, argv, "q:m:s:Q:M:S:")) != -1) {
                signaled = 0;
                target_id = 0;
                target_key = 0;
                result = 0;

                if (optarg != NULL && strcmp(optarg, "all") == 0) {
                        switch (c) {
                        case 'm':
                        case 'M':
                                result = shmrmall();
                                break;
                        case 'q':
                        case 'Q':
                                result = msgrmall();
                                break;
                        case 's':
                        case 'S':
                                result = semrmall();
                                break;
                        default:
                                usage();
                        }
                } else {
                        switch (c) {
                        case 'q':
                        case 'm':
                        case 's':
                                target_id = atoi(optarg);
                                break;
                        case 'Q':
                        case 'M':
                        case 'S':
                                target_key = atol(optarg);
                                if (target_key == IPC_PRIVATE) {
                                        warnx("can't remove private %ss",
                                            IPC_TO_STRING(c));
                                        continue;
                                }
                                break;
                        default:
                                usage();
                        }
                        switch (c) {
                        case 'q':
                                result = msgrm((key_t)0, target_id);
                                break;
                        case 'm':
                                result = shmrm((key_t)0, target_id);
                                break;
                        case 's':
                                result = semrm((key_t)0, target_id);
                                break;
                        case 'Q':
                                result = msgrm(target_key, 0);
                                break;
                        case 'M':
                                result = shmrm(target_key, 0);
                                break;
                        case 'S':
                                result = semrm(target_key, 0);
                                break;
                        }
                }
                if (result < 0) {
                        if (!signaled) {
                                if (target_id) {
                                        warn("%sid(%d): ",
                                            IPC_TO_STR(toupper(c)), target_id);
                                        errflg++;
                                } else if (target_key) {
                                        warn("%skey(%ld): ", IPC_TO_STR(c),
                                            (long)target_key);
                                        errflg++;
                                }
                        } else {
                                errflg++;
                                warnx("%ss are not configured in "
                                    "the running kernel",
                                    IPC_TO_STRING(toupper(c)));
                        }
                }
        }

        if (optind != argc) {
                warnx("Unknown argument: %s", argv[optind]);
                usage();
        }
        return errflg;
}