/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Adam Glass.
 * 4. 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/param.h>
#define _WANT_SYSVMSG_INTERNALS
#include <sys/msg.h>
#define _WANT_SYSVSEM_INTERNALS
#define _WANT_SEMUN
#include <sys/sem.h>
#define _WANT_SYSVSHM_INTERNALS
#include <sys/shm.h>

#include <ctype.h>
#include <err.h>
#include <grp.h>
#include <kvm.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "ipc.h"

static int      signaled;
static int      errflg;
static int      rmverbose = 0;

static void
usage(void)
{

        fprintf(stderr,
            "usage: ipcrm [-W] [-v[v]]\n"
            "             [-q msqid] [-m shmid] [-s semid]\n"
            "             [-Q msgkey] [-M shmkey] [-S semkey] ...\n");
        exit(1);
}

static int
msgrm(key_t key, int id)
{

        if (key == -1 || id == -1) {
                struct msqid_kernel *kxmsqids;
                size_t kxmsqids_len;
                int num;

                kget(X_MSGINFO, &msginfo, sizeof(msginfo));
                kxmsqids_len = sizeof(struct msqid_kernel) * msginfo.msgmni;
                kxmsqids = malloc(kxmsqids_len);
                kget(X_MSQIDS, kxmsqids, kxmsqids_len);
                num = msginfo.msgmni;
                while (num-- && !signaled)
                        if (kxmsqids[num].u.msg_qbytes != 0) {
                                id = IXSEQ_TO_IPCID(num,
                                        kxmsqids[num].u.msg_perm);
                                if (msgctl(id, IPC_RMID, NULL) < 0) {
                                        if (rmverbose > 1)
                                                warn("msqid(%d): ", id);
                                        errflg++;
                                } else
                                        if (rmverbose)
                                                printf(
                                                    "Removed %s %d\n",
                                                    IPC_TO_STRING('Q'),
                                                    id);
                        }
                return signaled ? -1 : 0;       /* errors maybe handled above */
        }

        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 == -1 || id == -1) {
                struct shmid_kernel *kxshmids;
                size_t kxshmids_len;
                int num;

                kget(X_SHMINFO, &shminfo, sizeof(shminfo));
                kxshmids_len = sizeof(struct shmid_kernel) * shminfo.shmmni;
                kxshmids = malloc(kxshmids_len);
                kget(X_SHMSEGS, kxshmids, kxshmids_len);
                num = shminfo.shmmni;
                while (num-- && !signaled)
                        if (kxshmids[num].u.shm_perm.mode & 0x0800) {
                                id = IXSEQ_TO_IPCID(num,
                                        kxshmids[num].u.shm_perm);
                                if (shmctl(id, IPC_RMID, NULL) < 0) {
                                        if (rmverbose > 1)
                                                warn("shmid(%d): ", id);
                                        errflg++;
                                } else
                                        if (rmverbose)
                                                printf(
                                                    "Removed %s %d\n",
                                                    IPC_TO_STRING('M'),
                                                    id);
                        }
                return signaled ? -1 : 0;       /* errors maybe handled above */
        }

        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)
{
        union semun arg;

        if (key == -1 || id == -1) {
                struct semid_kernel *kxsema;
                size_t kxsema_len;
                int num;

                kget(X_SEMINFO, &seminfo, sizeof(seminfo));
                kxsema_len = sizeof(struct semid_kernel) * seminfo.semmni;
                kxsema = malloc(kxsema_len);
                kget(X_SEMA, kxsema, kxsema_len);
                num = seminfo.semmni;
                while (num-- && !signaled)
                        if ((kxsema[num].u.sem_perm.mode & SEM_ALLOC) != 0) {
                                id = IXSEQ_TO_IPCID(num,
                                        kxsema[num].u.sem_perm);
                                if (semctl(id, 0, IPC_RMID, NULL) < 0) {
                                        if (rmverbose > 1)
                                                warn("semid(%d): ", id);
                                        errflg++;
                                } else
                                        if (rmverbose)
                                                printf(
                                                    "Removed %s %d\n",
                                                    IPC_TO_STRING('S'),
                                                    id);
                        }
                return signaled ? -1 : 0;       /* errors maybe handled above */
        }

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

        return semctl(id, 0, IPC_RMID, arg);
}

static void
not_configured(int signo __unused)
{

        signaled++;
}

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

        while ((c = getopt(argc, argv, "q:m:s:Q:M:S:vWy")) != -1) {

                signaled = 0;
                switch (c) {
                case 'v':
                        rmverbose++;
                        break;
                case 'y':
                        use_sysctl = 0;
                        break;
                }
        }

        optind = 1;
        errflg = 0;
        signal(SIGSYS, not_configured);
        while ((c = getopt(argc, argv, "q:m:s:Q:M:S:vWy")) != -1) {

                signaled = 0;
                switch (c) {
                case 'q':
                case 'm':
                case 's':
                        target_id = atoi(optarg);
                        if (c == 'q')
                                result = msgrm(0, target_id);
                        else if (c == 'm')
                                result = shmrm(0, target_id);
                        else
                                result = semrm(0, target_id);
                        if (result < 0) {
                                errflg++;
                                if (!signaled)
                                        warn("%sid(%d): ",
                                            IPC_TO_STR(toupper(c)), target_id);
                                else
                                        warnx(
                                            "%ss are not configured "
                                            "in the running kernel",
                                            IPC_TO_STRING(toupper(c)));
                        }
                        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;
                        }
                        if (c == 'Q')
                                result = msgrm(target_key, 0);
                        else if (c == 'M')
                                result = shmrm(target_key, 0);
                        else
                                result = semrm(target_key, 0);
                        if (result < 0) {
                                errflg++;
                                if (!signaled)
                                        warn("%ss(%ld): ",
                                            IPC_TO_STR(c), target_key);
                                else
                                        warnx("%ss are not configured "
                                            "in the running kernel",
                                            IPC_TO_STRING(c));
                        }
                        break;
                case 'v':
                case 'y':
                        /* Handled in other getopt() loop */
                        break;
                case 'W':
                        msgrm(-1, 0);
                        shmrm(-1, 0);
                        semrm(-1, 0);
                        break;
                case ':':
                        fprintf(stderr,
                            "option -%c requires an argument\n", optopt);
                        usage();
                case '?':
                        fprintf(stderr, "unrecognized option: -%c\n", optopt);
                        usage();
                }
        }

        if (optind != argc) {
                fprintf(stderr, "unknown argument: %s\n", argv[optind]);
                usage();
        }
        exit(errflg);
}