/*
 * 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.
 */

#define LOFS
#define MNTTYPE_LOFS "lofs"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libintl.h>
#include <errno.h>
#include <sys/fstyp.h>
#include <sys/fsid.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <fslib.h>

#define RET_OK          0
/*
 * /sbin/mount and the fs-local method understand this exit code to
 * mean that all the mount failures were related to lofs mounts. Since
 * this program only attempts to mount lofs file systems, when it fails
 * it returns this exit status.
 */
#define RET_ERR         111

static void usage(void);

static char  optbuf[MAX_MNTOPT_STR] = { '\0', };
static int   optsize = 0;

static char fstype[] = MNTTYPE_LOFS;

/*
 * usage: mount [-Ormq] [-o options] special mountp
 *
 * This mount program is exec'ed by /usr/sbin/mount if '-F lofs' is
 * specified.
 */
int
main(int argc, char *argv[])
{
        int c;
        char *special;          /* Entity being mounted */
        char *mountp;           /* Entity being mounted on */
        char *savedoptbuf;
        char *myname;
        char typename[64];
        int flags = 0;
        int errflag = 0;
        int qflg = 0;

        myname = strrchr(argv[0], '/');
        myname = myname ? myname+1 : argv[0];
        (void) snprintf(typename, sizeof (typename), "%s %s", fstype, myname);
        argv[0] = typename;

        while ((c = getopt(argc, argv, "o:rmOq")) != EOF) {
                switch (c) {
                case '?':
                        errflag++;
                        break;

                case 'o':
                        if (strlcpy(optbuf, optarg, sizeof (optbuf)) >=
                            sizeof (optbuf)) {
                                (void) fprintf(stderr,
                                    gettext("%s: Invalid argument: %s\n"),
                                    myname, optarg);
                                return (2);
                        }
                        optsize = strlen(optbuf);
                        break;
                case 'O':
                        flags |= MS_OVERLAY;
                        break;
                case 'r':
                        flags |= MS_RDONLY;
                        break;

                case 'm':
                        flags |= MS_NOMNTTAB;
                        break;

                case 'q':
                        qflg = 1;
                        break;

                default:
                        usage();
                }
        }
        if ((argc - optind != 2) || errflag) {
                usage();
        }
        special = argv[argc - 2];
        mountp = argv[argc - 1];

        if ((savedoptbuf = strdup(optbuf)) == NULL) {
                (void) fprintf(stderr, gettext("%s: out of memory\n"),
                    myname);
                exit(2);
        }
        if (mount(special, mountp, flags | MS_OPTIONSTR, fstype, NULL, 0,
            optbuf, MAX_MNTOPT_STR)) {
                (void) fprintf(stderr, "mount: ");
                perror(special);
                exit(RET_ERR);
        }
        if (optsize && !qflg)
                cmp_requested_to_actual_options(savedoptbuf, optbuf,
                    special, mountp);
        return (0);
}

void
usage(void)
{
        (void) fprintf(stderr,
            "Usage: mount [-Ormq] [-o options] special mountpoint\n");
        exit(RET_ERR);
}