/*
 * Copyright (c) 2000 by Matthew Jacob
 * 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,
 *    without modification, immediately at the beginning of the file.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * the GNU Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 * 
 * Matthew Jacob
 * Feral Software
 * mjacob@feral.com
 */
#include <unistd.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_enc.h>

#define ALLSTAT (SES_ENCSTAT_UNRECOV | SES_ENCSTAT_CRITICAL | \
        SES_ENCSTAT_NONCRITICAL | SES_ENCSTAT_INFO)

/*
 * Monitor named SES devices and note (via syslog) any changes in status.
 */

int
main(int a, char **v)
{
        static const char *usage =
            "usage: %s [ -c ] [ -d ] [ -t pollinterval ] device [ device ]\n";
        int fd, polltime, dev, nodaemon, clear, c;
        encioc_enc_status_t stat, nstat, *carray;

        if (a < 2) {
                fprintf(stderr, usage, *v);
                return (1);
        }

        nodaemon = 0;
        polltime = 30;
        clear = 0;
        while ((c = getopt(a, v, "cdt:")) != -1) {
                switch (c) {
                case 'c':
                        clear = 1;
                        break;
                case 'd':
                        nodaemon = 1;
                        break;
                case 't':
                        polltime = atoi(optarg);
                        break;
                default:
                        fprintf(stderr, usage, *v);
                        return (1);
                }
        }

        carray = malloc(a);
        if (carray == NULL) {
                perror("malloc");
                return (1);
        }
        for (dev = optind; dev < a; dev++)
                carray[dev] = (encioc_enc_status_t) -1;

        /*
         * Check to make sure we can open all devices
         */
        for (dev = optind; dev < a; dev++) {
                fd = open(v[dev], O_RDWR);
                if (fd < 0) {
                        perror(v[dev]);
                        return (1);
                }
                if (ioctl(fd, ENCIOC_INIT, NULL) < 0) {
                        fprintf(stderr, "%s: ENCIOC_INIT fails- %s\n",
                            v[dev], strerror(errno));
                        return (1);
                }
                (void) close(fd);
        }
        if (nodaemon == 0) {
                if (daemon(0, 0) < 0) {
                        perror("daemon");
                        return (1);
                }
                openlog("sesd", LOG_CONS, LOG_USER);
        } else {
                openlog("sesd", LOG_CONS|LOG_PERROR, LOG_USER);
        }

        for (;;) {
                for (dev = optind; dev < a; dev++) {
                        fd = open(v[dev], O_RDWR);
                        if (fd < 0) {
                                syslog(LOG_ERR, "%s: %m", v[dev]);
                                continue;
                        }

                        /*
                         * Get the actual current enclosure status.
                         */
                        if (ioctl(fd, ENCIOC_GETENCSTAT, (caddr_t) &stat) < 0) {
                                syslog(LOG_ERR,
                                    "%s: ENCIOC_GETENCSTAT- %m", v[dev]);
                                (void) close(fd);
                                continue;
                        }
                        if (stat != 0 && clear) {
                                nstat = 0;
                                if (ioctl(fd, ENCIOC_SETENCSTAT,
                                    (caddr_t) &nstat) < 0) {
                                        syslog(LOG_ERR,
                                            "%s: ENCIOC_SETENCSTAT- %m", v[dev]);
                                }
                        }
                        (void) close(fd);

                        if (stat == carray[dev])
                                continue;

                        carray[dev] = stat;
                        if ((stat & ALLSTAT) == 0) {
                                syslog(LOG_NOTICE,
                                    "%s: Enclosure Status OK", v[dev]);
                        }
                        if (stat & SES_ENCSTAT_INFO) {
                                syslog(LOG_NOTICE,
                                    "%s: Enclosure Has Information", v[dev]);
                        }
                        if (stat & SES_ENCSTAT_NONCRITICAL) {
                                syslog(LOG_WARNING,
                                    "%s: Enclosure Non-Critical", v[dev]);
                        }
                        if (stat & SES_ENCSTAT_CRITICAL) {
                                syslog(LOG_CRIT,
                                    "%s: Enclosure Critical", v[dev]);
                        }
                        if (stat & SES_ENCSTAT_UNRECOV) {
                                syslog(LOG_ALERT,
                                    "%s: Enclosure Unrecoverable", v[dev]);
                        }
                }
                sleep(polltime);
        }
        /* NOTREACHED */
}