/*      $NetBSD: amfs_program.c,v 1.2 2018/02/04 09:15:44 mrg Exp $     */

/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1989 Jan-Simon Pendry
* Copyright (c) 1989 Imperial College of Science, Technology & Medicine
* Copyright (c) 1989 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/amfs_program.c
*
*/

/*
* Program file system
*/

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

/* forward definitions */
static char *amfs_program_match(am_opts *fo);
static int amfs_program_mount(am_node *am, mntfs *mf);
static int amfs_program_umount(am_node *am, mntfs *mf);
static int amfs_program_init(mntfs *mf);

/*
* Ops structure
*/
am_ops amfs_program_ops =
{
 "program",
 amfs_program_match,
 amfs_program_init,
 amfs_program_mount,
 amfs_program_umount,
 amfs_error_lookup_child,
 amfs_error_mount_child,
 amfs_error_readdir,
 0,                            /* amfs_program_readlink */
 0,                            /* amfs_program_mounted */
 0,                            /* amfs_program_umounted */
 amfs_generic_find_srvr,
 0,                            /* amfs_program_get_wchan */
 FS_MKMNT | FS_BACKGROUND | FS_AMQINFO,        /* nfs_fs_flags */
#ifdef HAVE_FS_AUTOFS
 AUTOFS_PROGRAM_FS_FLAGS,
#endif /* HAVE_FS_AUTOFS */
};


/*
* Execute needs a mount and unmount command.
*/
static char *
amfs_program_match(am_opts *fo)
{
 char *prog;

 if (fo->opt_unmount && fo->opt_umount) {
   plog(XLOG_ERROR, "program: cannot specify both unmount and umount options");
   return 0;
 }
 if (!fo->opt_mount) {
   plog(XLOG_ERROR, "program: must specify mount command");
   return 0;
 }
 if (!fo->opt_unmount && !fo->opt_umount) {
   fo->opt_unmount = str3cat(NULL, UNMOUNT_PROGRAM, " umount ", fo->opt_fs);
   plog(XLOG_INFO, "program: un/umount not specified; using default \"%s\"",
        fo->opt_unmount);
 }
 prog = strchr(fo->opt_mount, ' ');

 return xstrdup(prog ? prog + 1 : fo->opt_mount);
}


static int
amfs_program_init(mntfs *mf)
{
 /* check if already saved value */
 if (mf->mf_private != NULL)
   return 0;

 if (mf->mf_fo == NULL)
   return 0;

 /* save unmount (or umount) command */
 if (mf->mf_fo->opt_unmount != NULL)
   mf->mf_private = (opaque_t) xstrdup(mf->mf_fo->opt_unmount);
 else
   mf->mf_private = (opaque_t) xstrdup(mf->mf_fo->opt_umount);
 mf->mf_prfree = (void (*)(opaque_t)) free;

 return 0;
}


static int
amfs_program_exec(char *info)
{
 char **xivec;
 int error;

 /*
  * Split copy of command info string
  */
 info = xstrdup(info);
 xivec = strsplit(info, ' ', '\'');

 /*
  * Put stdout to stderr
  */
 (void) fclose(stdout);
 if (!logfp) {
   logfp = stderr;             /* initialize before possible first use */
   if (dup(fileno(logfp)) == -1)
     goto out;
 }
 if (fileno(logfp) != fileno(stderr)) {
   (void) fclose(stderr);
   if (dup(fileno(logfp)) == -1)
     goto out;
 }

 /*
  * Try the exec
  */
 if (amuDebug(D_FULL)) {
   char **cp = xivec;
   plog(XLOG_DEBUG, "executing (un)mount command...");
   while (*cp) {
     plog(XLOG_DEBUG, "arg[%ld] = '%s'", (long) (cp - xivec), *cp);
     cp++;
   }
 }

 if (xivec[0] == 0 || xivec[1] == 0) {
   errno = EINVAL;
   plog(XLOG_USER, "1st/2nd args missing to (un)mount program");
 } else {
   (void) execv(xivec[0], xivec + 1);
   error = errno;
   plog(XLOG_ERROR, "exec failed: %m");
   errno = error;
 }

out:
 /*
  * Save error number
  */
 error = errno;

 /*
  * Free allocate memory
  */
 XFREE(info);
 XFREE(xivec);

 /*
  * Return error
  */
 return error;
}


static int
amfs_program_mount(am_node *am, mntfs *mf)
{
 return amfs_program_exec(mf->mf_fo->opt_mount);
}


static int
amfs_program_umount(am_node *am, mntfs *mf)
{
 return amfs_program_exec((char *) mf->mf_private);
}

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