/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <sys/types.h>
#include <unistd.h>
#include <stropts.h>
#include <libintl.h>
#include <errno.h>
#include <time.h>
#include <string.h>
#include <assert.h>
#include <getopt.h>
#include <cmdparse.h>
#include <signal.h>
#include <pthread.h>
#include <fcntl.h>
#include <locale.h>
#include <sys/systeminfo.h>

#include <libiscsit.h>
#include <sys/iscsit/iscsit_common.h>

static int it_enable(int, char **, cmdOptions_t *, void *);
static int it_disable(int, char **, cmdOptions_t *, void *);

/*
 *  MAJOR - This should only change when there is an incompatible change made
 *  to the interfaces or the output.
 *
 *  MINOR - This should change whenever there is a new command or new feature
 *  with no incompatible change.
 */
#define VERSION_STRING_MAJOR        "1"
#define VERSION_STRING_MINOR        "0"
#define VERSION_STRING_MAX_LEN      10

/* 10 ms sleep in nanoseconds */
#define TEN_MS_NANOSLEEP  10000000

/* tables set up based on cmdparse instructions */

/* add new options here */
optionTbl_t longOptions[] = {
        {NULL, 0, 0, 0}
};

/*
 * Add new subcommands here
 */
subCommandProps_t subcommands[] = {
        {"start", it_enable, NULL, NULL, NULL, OPERAND_NONE, NULL},
        {"stop", it_disable, NULL, NULL, NULL, OPERAND_NONE, NULL},
        {NULL, 0, NULL, NULL, 0, 0, 0, NULL}
};

/* globals */
char *cmdName;

/*
 * Opens the iSCSI Target Node
 *
 * fd - Return the iscsit file descriptor
 */
static int
it_open(int *fd)
{

        int ret = ITADM_SUCCESS;

        *fd = open(ISCSIT_NODE, O_RDONLY);
        if (*fd < 0) {
                if (errno == EPERM) {
                        (void) fprintf(stdout, "open failed: EPERM");
                        ret = ITADM_PERM;
                } else {
                        (void) fprintf(stdout, "open failed: INVALID");
                        ret = ITADM_INVALID;
                }
        }

        return (ret);
}

/*
 * Enables the iSCSI Target
 */
/*ARGSUSED*/
static int
it_enable(int operandLen, char *operands[], cmdOptions_t *options,
    void *args)
{
        int     ret;
        int     fd;
        char    buf[256];
        uint32_t *buflenp;
        char    *fqhnp;
        iscsit_hostinfo_t hostinfo;

        (void) fprintf(stdout, "%s: %s\n", cmdName,
            gettext("Requesting to enable iscsi target"));

        bzero(buf, 256);
        bzero(hostinfo.fqhn, sizeof (hostinfo.fqhn));

        /* Open the iscsi target node */
        if ((ret = it_open(&fd)) != ITADM_SUCCESS) {
                (void) fprintf(stdout, "Unable to open device %s", ISCSIT_NODE);
                return (ret);
        }

        (void) fprintf(stdout, "it_enable [fd=%d]\n", fd);
        /* enable the iscsi target */
        buflenp = (uint32_t *)((void *)&buf);
        *buflenp = strlen("target_name") + 1;
        (void) strncpy(buf + sizeof (uint32_t), "target_name",
            256 - sizeof (uint32_t));

        fqhnp = &hostinfo.fqhn[0];

        ret = sysinfo(SI_HOSTNAME, fqhnp, 256);

        if ((ret != -1) && (ret < sizeof (hostinfo.fqhn))) {
                fqhnp += ret;
                hostinfo.length = ret;
                hostinfo.fqhn[ret-1] = '.';
                hostinfo.length += sysinfo(SI_SRPC_DOMAIN, fqhnp,
                    sizeof (hostinfo.fqhn) - ret);
        }

        (void) fprintf(stdout, "it_enable: fqhn = '%s'\n", hostinfo.fqhn);

        if ((ret = ioctl(fd, ISCSIT_IOC_ENABLE_SVC, &hostinfo)) != 0) {
                (void) fprintf(stdout, "Unable to issue ioctl: %d", errno);
                return (ret);
        }
        return (ITADM_SUCCESS);
}


/*
 * Disable the iSCSI target
 */
/* ARGSUSED */
static int
it_disable(int operandLen, char *operands[], cmdOptions_t *options,
    void *args)
{
        int     ret;
        int     fd;

        (void) fprintf(stdout, "%s: %s\n", cmdName,
            gettext("Requesting to disable iscsi target"));

        /* Open the iscsi target node */
        if ((ret = it_open(&fd)) != ITADM_SUCCESS) {
                return (ret);
        }

        /* disable the iSCSI target */
        if ((ret = ioctl(fd, ISCSIT_IOC_DISABLE_SVC, NULL)) != 0) {
                return (ret);
        }
        return (ITADM_SUCCESS);
}

/*
 * input:
 *  execFullName - exec name of program (argv[0])
 *
 *  copied from usr/src/cmd/zoneadm/zoneadm.c in OS/Net
 *  (changed name to lowerCamelCase to keep consistent with this file)
 *
 * Returns:
 *  command name portion of execFullName
 */
static char *
getExecBasename(char *execFullname)
{
        char *lastSlash, *execBasename;

        /* guard against '/' at end of command invocation */
        for (;;) {
                lastSlash = strrchr(execFullname, '/');
                if (lastSlash == NULL) {
                        execBasename = execFullname;
                        break;
                } else {
                        execBasename = lastSlash + 1;
                        if (*execBasename == '\0') {
                                *lastSlash = '\0';
                                continue;
                        }
                        break;
                }
        }
        return (execBasename);
}

int
main(int argc, char *argv[])
{
        synTables_t synTables;
        char versionString[VERSION_STRING_MAX_LEN];
        int ret;
        int funcRet;
        void *subcommandArgs = NULL;

        (void) setlocale(LC_ALL, "");
        /* set global command name */
        cmdName = getExecBasename(argv[0]);

        (void) snprintf(versionString, VERSION_STRING_MAX_LEN, "%s.%s",
            VERSION_STRING_MAJOR, VERSION_STRING_MINOR);
        synTables.versionString = versionString;
        synTables.longOptionTbl = &longOptions[0];
        synTables.subCommandPropsTbl = &subcommands[0];

        ret = cmdParse(argc, argv, synTables, subcommandArgs, &funcRet);
        if (ret != 0) {
                return (ret);
        }

        return (funcRet);
} /* end main */