/*      $NetBSD: ops_udf.c,v 1.1.1.2 2015/01/17 16:34:15 christos Exp $ */

/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*
* File: am-utils/amd/ops_udf.c
*
*/

/*
* UDF file system
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>

/* forward definitions */
static char *udf_match(am_opts *fo);
static int udf_mount(am_node *am, mntfs *mf);
static int udf_umount(am_node *am, mntfs *mf);

/*
* Ops structure
*/
am_ops udf_ops =
{
       "udf",
       udf_match,
       0,                              /* udf_init */
       udf_mount,
       udf_umount,
       amfs_error_lookup_child,
       amfs_error_mount_child,
       amfs_error_readdir,
       0,                              /* udf_readlink */
       0,                              /* udf_mounted */
       0,                              /* udf_umounted */
       amfs_generic_find_srvr,
       0,                              /* udf_get_wchan */
       FS_MKMNT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
#ifdef HAVE_FS_AUTOFS
       AUTOFS_UDF_FS_FLAGS,
#endif /* HAVE_FS_AUTOFS */
};

#if defined(HAVE_UDF_ARGS_T_NOBODY_GID) || defined(HAVE_UDF_ARGS_T_NOBODY_UID)
static int
a_num(const char *s, const char *id_type)
{
       int id;
       char *ep;

       id = strtol(s, &ep, 0);
       if (*ep || s == ep || id < 0) {
               plog(XLOG_ERROR, "mount_udf: unknown %s: %s", id_type, s);
               return 0;
       }
       return id;
}
#endif /* defined(HAVE_UDF_ARGS_T_NOBODY_GID) || defined(HAVE_UDF_ARGS_T_NOBODY_UID) */

#if defined(HAVE_UDF_ARGS_T_NOBODY_GID)
static gid_t
a_gid(const char *s, const char *id_type)
{
       struct group *gr;

       if ((gr = getgrnam(s)) != NULL)
               return gr->gr_gid;
       return a_num(s, id_type);
}
#endif /* defined(HAVE_UDF_ARGS_T_NOBODY_GID) */

#if defined(HAVE_UDF_ARGS_T_NOBODY_UID)
static uid_t
a_uid(const char *s, const char *id_type)
{
       struct passwd *pw;

       if ((pw = getpwnam(s)) != NULL)
               return pw->pw_uid;
       return a_num(s, id_type);
}
#endif /* defined(HAVE_UDF_ARGS_T_NOBODY_UID) */

/*
* UDF needs remote filesystem.
*/
static char *
udf_match(am_opts *fo)
{

       if (!fo->opt_dev) {
               plog(XLOG_USER, "udf: no source device specified");
               return 0;
       }
       dlog("UDF: mounting device \"%s\" on \"%s\"", fo->opt_dev, fo->opt_fs);

       /*
        * Determine magic cookie to put in mtab
        */
       return xstrdup(fo->opt_dev);
}

static int
mount_udf(char *mntdir, char *fs_name, char *opts, int on_autofs)
{
       udf_args_t udf_args;
       mntent_t mnt;
       int flags;
       char *str;
#if defined(HAVE_UDF_ARGS_T_NOBODY_UID) || defined(HAVE_UDF_ARGS_T_ANON_UID)
       uid_t uid_nobody;
       gid_t gid_nobody;
#endif /* defined(HAVE_UDF_ARGS_T_NOBODY_UID) || defined(HAVE_UDF_ARGS_T_ANON_UID) */
       /*
        * Figure out the name of the file system type.
        */
       MTYPE_TYPE type = MOUNT_TYPE_UDF;

#if defined(HAVE_UDF_ARGS_T_NOBODY_UID) || defined(HAVE_UDF_ARGS_T_ANON_UID)
       uid_nobody = a_uid("nobody", "user");
       if (uid_nobody == 0) {
               plog(XLOG_ERROR, "mount_udf: invalid uid for nobody");
               return EPERM;
       }
#endif /* defined(HAVE_UDF_ARGS_T_NOBODY_UID) || defined(HAVE_UDF_ARGS_T_ANON_UID) */

#if defined(HAVE_UDF_ARGS_T_NOBODY_GID) || defined(HAVE_UDF_ARGS_T_ANON_GID)
       gid_nobody = a_gid("nobody", "group");
       if (gid_nobody == 0) {
               plog(XLOG_ERROR, "mount_udf: invalid gid for nobody");
               return EPERM;
       }
#endif /* defined(HAVE_UDF_ARGS_T_NOBODY_GID) || defined(HAVE_UDF_ARGS_T_ANON_GID) */

       str = NULL;
       memset((voidp) &udf_args, 0, sizeof(udf_args)); /* Paranoid */

       /*
        * Fill in the mount structure
        */
       memset((voidp)&mnt, 0, sizeof(mnt));
       mnt.mnt_dir = mntdir;
       mnt.mnt_fsname = fs_name;
       mnt.mnt_type = MNTTAB_TYPE_UDF;
       mnt.mnt_opts = opts;

       flags = compute_mount_flags(&mnt);

#ifdef HAVE_UDF_ARGS_T_UDFMFLAGS
# if defined(MNT2_UDF_OPT_CLOSESESSION) && defined(MNTTAB_OPT_CLOSESESSION)
       if (amu_hasmntopt(&mnt, MNTTAB_OPT_CLOSESESSION))
               udf_args.udfmflags |= MNT2_UDF_OPT_CLOSESESSION;
# endif /* defined(MNT2_UDF_OPT_CLOSESESSION) && defined(MNTTAB_OPT_CLOSESESSION) */
#endif /* HAVE_UDF_ARGS_T_UDFMFLAGS */

#ifdef HAVE_UDF_ARGS_T_NOBODY_UID
       udf_args.nobody_uid = uid_nobody;
#endif /* HAVE_UDF_ARGS_T_NOBODY_UID */

#ifdef HAVE_UDF_ARGS_T_NOBODY_GID
       udf_args.nobody_gid = gid_nobody;
#endif /* HAVE_UDF_ARGS_T_NOBODY_GID */

#ifdef HAVE_UDF_ARGS_T_ANON_UID
       udf_args.anon_uid = uid_nobody; /* default to nobody */
       if ((str = hasmntstr(&mnt, MNTTAB_OPT_USER)) != NULL) {
               udf_args.anon_uid = a_uid(str, MNTTAB_OPT_USER);
               XFREE(str);
       }
#endif /* HAVE_UDF_ARGS_T_ANON_UID */

#ifdef HAVE_UDF_ARGS_T_ANON_GID
       udf_args.anon_gid = gid_nobody; /* default to nobody */
       if ((str = hasmntstr(&mnt, MNTTAB_OPT_GROUP)) != NULL) {
               udf_args.anon_gid = a_gid(str, MNTTAB_OPT_GROUP);
               XFREE(str);
       }
#endif /* HAVE_UDF_ARGS_T_ANON_GID */

#ifdef HAVE_UDF_ARGS_T_GMTOFF
       udf_args.gmtoff = 0;
       if ((str = hasmntstr(&mnt, MNTTAB_OPT_GMTOFF)) != NULL) {
               udf_args.gmtoff = a_num(str, MNTTAB_OPT_GMTOFF);
               XFREE(str);
       }
#endif /* HAVE_UDF_ARGS_T_GMTOFF */

#ifdef HAVE_UDF_ARGS_T_SESSIONNR
       udf_args.sessionnr = 0;
       if ((str = hasmntstr(&mnt, MNTTAB_OPT_SESSIONNR)) != NULL) {
               udf_args.sessionnr = a_num(str, MNTTAB_OPT_SESSIONNR);
               XFREE(str);
       }
#endif /* HAVE_UDF_ARGS_T_SESSIONNR */

#ifdef HAVE_UDF_ARGS_T_VERSION
# ifdef UDFMNT_VERSION
       udf_args.version = UDFMNT_VERSION;
# endif /* UDFMNT_VERSION */
#endif /* HAVE_UDF_ARGS_T_VERSION */

#ifdef HAVE_UFS_ARGS_T_FSPEC
       udf_args.fspec = fs_name;
#endif /* HAVE_UFS_ARGS_T_FSPEC */

       /*
        * Call generic mount routine
        */
       return mount_fs(&mnt, flags, (caddr_t)&udf_args, 0, type, 0, NULL,
           mnttab_file_name, on_autofs);
}

static int
udf_mount(am_node *am, mntfs *mf)
{
       int on_autofs;
       int error;

       on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
       error = mount_udf(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
       if (error) {
               errno = error;
               plog(XLOG_ERROR, "mount_udf: %m");
               return error;
       }
       return 0;
}


static int
udf_umount(am_node *am, mntfs *mf)
{
       int unmount_flags;

       unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
       return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
}

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