/*     $NetBSD: mnttab.c,v 1.4 2019/01/27 02:08:34 pgoyette Exp $  */

/*-
* Copyright (c) 2006 Pawel Jakub Dawidek <[email protected]>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
*/

/*
* This file implements Solaris compatible getmntany() and hasmntopt()
* functions.
*/

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/cddl/compat/opensolaris/misc/mnttab.c 209962 2010-07-12 23:49:04Z mm $");
__RCSID("$NetBSD: mnttab.c,v 1.4 2019/01/27 02:08:34 pgoyette Exp $");

#include <sys/param.h>
#include <sys/statvfs.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>

#include <stdio.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

char *
mntopt(char **p)
{
       char *cp = *p;
       char *retstr;

       while (*cp && isspace(*cp))
               cp++;

       retstr = cp;
       while (*cp && *cp != ',')
               cp++;

       if (*cp) {
               *cp = '\0';
               cp++;
       }

       *p = cp;
       return (retstr);
}

char *
hasmntopt(struct mnttab *mnt, char *opt)
{
       char tmpopts[MNT_LINE_MAX];
       char *f, *opts = tmpopts;

       if (mnt->mnt_mntopts == NULL)
               return (NULL);
       (void) strcpy(opts, mnt->mnt_mntopts);
       f = mntopt(&opts);
       for (; *f; f = mntopt(&opts)) {
               if (strncmp(opt, f, strlen(opt)) == 0)
                       return (f - tmpopts + mnt->mnt_mntopts);
       }
       return (NULL);
}

static void
optadd(char *mntopts, size_t size, const char *opt)
{

       if (mntopts[0] != '\0')
               strlcat(mntopts, ",", size);
       strlcat(mntopts, opt, size);
}

void
statvfs2mnttab(struct statvfs *sfs, struct mnttab *mp)
{
       static char mntopts[MNTMAXSTR];
       long flags;

       mntopts[0] = '\0';

       flags = sfs->f_flag;
#define OPTADD(opt)     optadd(mntopts, sizeof(mntopts), (opt))
       if (flags & MNT_RDONLY)
               OPTADD(MNTOPT_RO);
       else
               OPTADD(MNTOPT_RW);
       if (flags & MNT_NOSUID)
               OPTADD(MNTOPT_NOSUID);
       else
               OPTADD(MNTOPT_SETUID);
       if (flags & MNT_UPDATE)
               OPTADD(MNTOPT_REMOUNT);
       if (flags & MNT_NOATIME)
               OPTADD(MNTOPT_NOATIME);
       else
               OPTADD(MNTOPT_ATIME);
       OPTADD(MNTOPT_NOXATTR);
       if (flags & MNT_NOEXEC)
               OPTADD(MNTOPT_NOEXEC);
       else
               OPTADD(MNTOPT_EXEC);
#undef  OPTADD
       mp->mnt_special = sfs->f_mntfromname;
       mp->mnt_mountp = sfs->f_mntonname;
       mp->mnt_fstype = sfs->f_fstypename;
       mp->mnt_mntopts = mntopts;
}

static struct statvfs *gsfs;
static int allfs;

static int
statvfs_init(void)
{
       struct statvfs *sfs;
       int error;

       if (gsfs != NULL) {
               free(gsfs);
               gsfs = NULL;
       }
       allfs = getvfsstat(NULL, 0, ST_WAIT);
       if (allfs == -1)
               goto fail;
       gsfs = malloc(sizeof(gsfs[0]) * allfs * 2);
       if (gsfs == NULL)
               goto fail;
       allfs = getvfsstat(gsfs, sizeof(gsfs[0]) * allfs * 2, ST_WAIT);
       if (allfs == -1)
               goto fail;
       sfs = realloc(gsfs, allfs * sizeof(gsfs[0]));
       if (sfs != NULL)
               gsfs = sfs;
       return (0);
fail:
       error = errno;
       if (gsfs != NULL)
               free(gsfs);
       gsfs = NULL;
       allfs = 0;
       return (error);
}

int
getmntany(FILE *fd, struct mnttab *mgetp, struct mnttab *mrefp)
{
       int i, error;

       error = statvfs_init();
       if (error != 0)
               return (error);

       for (i = 0; i < allfs; i++) {
               if (mrefp->mnt_special != NULL &&
                   strcmp(mrefp->mnt_special, gsfs[i].f_mntfromname) != 0) {
                       continue;
               }
               if (mrefp->mnt_mountp != NULL &&
                   strcmp(mrefp->mnt_mountp, gsfs[i].f_mntonname) != 0) {
                       continue;
               }
               if (mrefp->mnt_fstype != NULL &&
                   strcmp(mrefp->mnt_fstype, gsfs[i].f_fstypename) != 0) {
                       continue;
               }
               statvfs2mnttab(&gsfs[i], mgetp);
               return (0);
       }
       return (-1);
}

int
getmntent(FILE *fp, struct mnttab *mp)
{
       struct statvfs *sfs;
       int error, nfs;

       nfs = (int)lseek(fileno(fp), 0, SEEK_CUR);
       if (nfs == -1)
               return (errno);
       /* If nfs is 0, we want to refresh our cache. */
       if (nfs == 0 || gsfs == NULL) {
               error = statvfs_init();
               if (error != 0)
                       return (error);
       }
       if (nfs >= allfs)
               return (-1);
       statvfs2mnttab(&gsfs[nfs], mp);
       if (lseek(fileno(fp), 1, SEEK_CUR) == -1)
               return (errno);
       return (0);
}

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