/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 * 
 * Obtained from: $NetBSD: msgtest.c,v 1.7 2002/07/20 08:36:25 grant Exp $
 */

/*
 * Test the SVID-compatible Message Queue facility.
 */

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/wait.h>

#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

void    print_msqid_ds (struct msqid_ds *, mode_t);
void    sigsys_handler(int);
void    sigchld_handler (int);
void    cleanup (void);
void    receiver (void);
void    usage (void);

#define MESSAGE_TEXT_LEN        255

/*
 * Define it as test_mymsg because we already have struct mymsg and we dont
 * want to conflict with it.  Also, regression fails when the default mymsg
 * struct is used, because mtext[] array is '1', so the passed string cannot
 * be processed.
 */
struct test_mymsg {
        long    mtype;
        char    mtext[MESSAGE_TEXT_LEN];
};

const char *m1_str = "California is overrated.";
const char *m2_str = "The quick brown fox jumped over the lazy dog.";

#define MTYPE_1         1
#define MTYPE_1_ACK     2

#define MTYPE_2         3
#define MTYPE_2_ACK     4

int     sender_msqid = -1;
pid_t   child_pid;

key_t   msgkey;

int
main(int argc, char *argv[])
{
        struct sigaction sa;
        struct msqid_ds m_ds;
        struct test_mymsg m;
        sigset_t sigmask;

        if (argc != 2)
                usage();

        /*
         * Install a SIGSYS handler so that we can exit gracefully if
         * System V Message Queue support isn't in the kernel.
         */
        sa.sa_handler = sigsys_handler;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
        if (sigaction(SIGSYS, &sa, NULL) == -1)
                err(1, "sigaction SIGSYS");

        /*
         * Install and SIGCHLD handler to deal with all possible exit
         * conditions of the receiver.
         */
        sa.sa_handler = sigchld_handler;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
        if (sigaction(SIGCHLD, &sa, NULL) == -1)
                err(1, "sigaction SIGCHLD");

        msgkey = ftok(argv[1], 4160);

        /*
         * Initialize child_pid to ourselves to that the cleanup function
         * works before we create the receiver.
         */
        child_pid = getpid();

        /*
         * Make sure that when the sender exits, the message queue is
         * removed.
         */
        if (atexit(cleanup) == -1)
                err(1, "atexit");

        if ((sender_msqid = msgget(msgkey, IPC_CREAT | 0640)) == -1)
                err(1, "msgget");

        if (msgctl(sender_msqid, IPC_STAT, &m_ds) == -1)
                err(1, "msgctl IPC_STAT");

        print_msqid_ds(&m_ds, 0640);

        m_ds.msg_perm.mode = (m_ds.msg_perm.mode & ~0777) | 0600;

        if (msgctl(sender_msqid, IPC_SET, &m_ds) == -1)
                err(1, "msgctl IPC_SET");

        bzero(&m_ds, sizeof m_ds);

        if (msgctl(sender_msqid, IPC_STAT, &m_ds) == -1)
                err(1, "msgctl IPC_STAT");

        if ((m_ds.msg_perm.mode & 0777) != 0600)
                err(1, "IPC_SET of mode didn't hold");

        print_msqid_ds(&m_ds, 0600);

        switch ((child_pid = fork())) {
        case -1:
                err(1, "fork");
                /* NOTREACHED */

        case 0:
                receiver();
                break;

        default:
                break;
        }

        /*
         * Send the first message to the receiver and wait for the ACK.
         */
        m.mtype = MTYPE_1;
        strcpy(m.mtext, m1_str);
        if (msgsnd(sender_msqid, &m, strlen(m1_str) + 1, 0) == -1)
                err(1, "sender: msgsnd 1");

        if (msgrcv(sender_msqid, &m, sizeof(m.mtext), MTYPE_1_ACK, 0) !=
            strlen(m1_str) + 1)
                err(1, "sender: msgrcv 1 ack");

        print_msqid_ds(&m_ds, 0600);

        /*
         * Send the second message to the receiver and wait for the ACK.
         */
        m.mtype = MTYPE_2;
        strcpy(m.mtext, m2_str);
        if (msgsnd(sender_msqid, &m, strlen(m2_str) + 1, 0) == -1)
                err(1, "sender: msgsnd 2");

        if (msgrcv(sender_msqid, &m, sizeof(m.mtext), MTYPE_2_ACK, 0) !=
            strlen(m2_str) + 1)
                err(1, "sender: msgrcv 2 ack");

        /*
         * Suspend forever; when we get SIGCHLD, the handler will exit.
         */
        sigemptyset(&sigmask);
        (void) sigsuspend(&sigmask);

        /*
         * ...and any other signal is an unexpected error.
         */
        errx(1, "sender: received unexpected signal");
}

void
sigsys_handler(int signo)
{

        errx(1, "System V Message Queue support is not present in the kernel");
}

void
sigchld_handler(int signo)
{
        struct msqid_ds m_ds;
        int cstatus;

        /*
         * Reap the child; if it exited successfully, then the test passed!
         */
        if (waitpid(child_pid, &cstatus, 0) != child_pid)
                err(1, "waitpid");

        if (WIFEXITED(cstatus) == 0)
                errx(1, "receiver exited abnormally");

        if (WEXITSTATUS(cstatus) != 0)
                errx(1, "receiver exited with status %d",
                    WEXITSTATUS(cstatus));

        /*
         * If we get here, the child has exited normally, and thus
         * we should exit normally too.  First, tho, we print out
         * the final stats for the message queue.
         */

        if (msgctl(sender_msqid, IPC_STAT, &m_ds) == -1)
                err(1, "msgctl IPC_STAT");

        print_msqid_ds(&m_ds, 0600);

        exit(0);
}

void
cleanup()
{

        /*
         * If we're the sender, and it exists, remove the message queue.
         */
        if (child_pid != 0 && sender_msqid != -1) {
                if (msgctl(sender_msqid, IPC_RMID, NULL) == -1)
                        warn("msgctl IPC_RMID");
        }
}

void
print_msqid_ds(struct msqid_ds *mp, mode_t mode)
{
        uid_t uid = geteuid();
        gid_t gid = getegid();

        printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
            mp->msg_perm.uid, mp->msg_perm.gid,
            mp->msg_perm.cuid, mp->msg_perm.cgid,
            mp->msg_perm.mode & 0777);

        printf("qnum %lu, qbytes %lu, lspid %d, lrpid %d\n",
            mp->msg_qnum, (u_long)mp->msg_qbytes, mp->msg_lspid,
            mp->msg_lrpid);

        printf("stime: %s", ctime(&mp->msg_stime));
        printf("rtime: %s", ctime(&mp->msg_rtime));
        printf("ctime: %s", ctime(&mp->msg_ctime));

        /*
         * Sanity check a few things.
         */

        if (mp->msg_perm.uid != uid || mp->msg_perm.cuid != uid)
                errx(1, "uid mismatch");

        if (mp->msg_perm.gid != gid || mp->msg_perm.cgid != gid)
                errx(1, "gid mismatch");

        if ((mp->msg_perm.mode & 0777) != mode)
                errx(1, "mode mismatch");
}

void
usage()
{

        fprintf(stderr, "usage: %s keypath\n", getprogname());
        exit(1);
}

void
receiver()
{
        struct test_mymsg m;
        int msqid;

        if ((msqid = msgget(msgkey, 0)) == -1)
                err(1, "receiver: msgget");

        /*
         * Receive the first message, print it, and send an ACK.
         */

        if (msgrcv(msqid, &m, sizeof(m.mtext), MTYPE_1, 0) !=
            strlen(m1_str) + 1)
                err(1, "receiver: msgrcv 1");

        printf("%s\n", m.mtext);
        if (strcmp(m.mtext, m1_str) != 0)
                err(1, "receiver: message 1 data isn't correct");

        m.mtype = MTYPE_1_ACK;

        if (msgsnd(msqid, &m, strlen(m1_str) + 1, 0) == -1)
                err(1, "receiver: msgsnd ack 1");

        /*
         * Receive the second message, print it, and send an ACK.
         */

        if (msgrcv(msqid, &m, sizeof(m.mtext), MTYPE_2, 0) !=
            strlen(m2_str) + 1)
                err(1, "receiver: msgrcv 2");

        printf("%s\n", m.mtext);
        if (strcmp(m.mtext, m2_str) != 0)
                err(1, "receiver: message 2 data isn't correct");

        m.mtype = MTYPE_2_ACK;

        if (msgsnd(msqid, &m, strlen(m2_str) + 1, 0) == -1)
                err(1, "receiver: msgsnd ack 2");

        exit(0);
}