/*      $NetBSD: am_ops.c,v 1.1.1.3 2015/01/17 16:34:15 christos 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/am_ops.c
*
*/

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


/*
* The order of these entries matters, since lookups in this table are done
* on a first-match basis.  The entries below are a mixture of native
* filesystems supported by the OS (HAVE_FS_FOO), and some meta-filesystems
* supported by amd (HAVE_AMU_FS_FOO).  The order is set here in expected
* match-hit such that more popular filesystems are listed first (nfs is the
* most popular, followed by a symlink F/S)
*/
static am_ops *vops[] =
{
#ifdef HAVE_FS_NFS
 &nfs_ops,                     /* network F/S (version 2) */
#endif /* HAVE_FS_NFS */
#ifdef HAVE_AMU_FS_LINK
 &amfs_link_ops,               /* symlink F/S */
#endif /* HAVE_AMU_FS_LINK */

 /*
  * Other amd-supported meta-filesystems.
  */
#ifdef HAVE_AMU_FS_NFSX
 &amfs_nfsx_ops,               /* multiple-nfs F/S */
#endif /* HAVE_AMU_FS_NFSX */
#ifdef HAVE_AMU_FS_NFSL
 &amfs_nfsl_ops,               /* NFS with local link existence check */
#endif /* HAVE_AMU_FS_NFSL */
#ifdef HAVE_AMU_FS_HOST
 &amfs_host_ops,               /* multiple exported nfs F/S */
#endif /* HAVE_AMU_FS_HOST */
#ifdef HAVE_AMU_FS_LINKX
 &amfs_linkx_ops,              /* symlink F/S with link target verify */
#endif /* HAVE_AMU_FS_LINKX */
#ifdef HAVE_AMU_FS_PROGRAM
 &amfs_program_ops,            /* program F/S */
#endif /* HAVE_AMU_FS_PROGRAM */
#ifdef HAVE_AMU_FS_UNION
 &amfs_union_ops,              /* union F/S */
#endif /* HAVE_AMU_FS_UNION */

 /*
  * A few more native filesystems.
  */
#ifdef HAVE_FS_UFS
 &ufs_ops,                     /* Unix F/S */
#endif /* HAVE_FS_UFS */
#ifdef HAVE_FS_XFS
 &xfs_ops,                     /* Unix (irix) F/S */
#endif /* HAVE_FS_XFS */
#ifdef HAVE_FS_EXT
 &ext2_ops,                    /* Unix (linux) F/S */
 &ext3_ops,                    /* Unix (linux) F/S */
 &ext4_ops,                    /* Unix (linux) F/S */
#endif /* HAVE_FS_EXT */
#ifdef HAVE_FS_EFS
 &efs_ops,                     /* Unix (irix) F/S */
#endif /* HAVE_FS_EFS */
#ifdef HAVE_FS_LOFS
 &lofs_ops,                    /* loopback F/S */
#endif /* HAVE_FS_LOFS */
#ifdef HAVE_FS_CDFS
 &cdfs_ops,                    /* CDROM/HSFS/ISO9960 F/S */
#endif /* HAVE_FS_CDFS */
#ifdef HAVE_FS_PCFS
 &pcfs_ops,                    /* Floppy/MSDOS F/S */
#endif /* HAVE_FS_PCFS */
#ifdef HAVE_FS_CACHEFS
 &cachefs_ops,                 /* caching F/S */
#endif /* HAVE_FS_CACHEFS */
#ifdef HAVE_FS_TMPFS
 &tmpfs_ops,                   /* /tmp (in memory) F/S */
#endif /* HAVE_FS_TMPFS */
#ifdef HAVE_FS_NULLFS
/* FILL IN */                   /* null (loopback) F/S */
#endif /* HAVE_FS_NULLFS */
#ifdef HAVE_FS_UNIONFS
/* FILL IN */                   /* union (bsd44) F/S */
#endif /* HAVE_FS_UNIONFS */
#ifdef HAVE_FS_UMAPFS
/* FILL IN */                   /* uid/gid mapping F/S */
#endif /* HAVE_FS_UMAPFS */
#ifdef HAVE_FS_UDF
 &udf_ops,                     /* UDF F/S */
#endif /* HAVE_FS_UDF */
#ifdef HAVE_FS_LUSTRE
 &lustre_ops,                  /* Lustre */
#endif /* HAVE_FS_LUSTRE */

 /*
  * These 4 should be last, in the order:
  *    (1) amfs_auto
  *    (2) amfs_direct
  *    (3) amfs_toplvl
  *    (4) amfs_error
  */
#ifdef HAVE_AMU_FS_AUTO
 &amfs_auto_ops,               /* Automounter F/S */
#endif /* HAVE_AMU_FS_AUTO */
#ifdef HAVE_AMU_FS_DIRECT
 &amfs_direct_ops,             /* direct-mount F/S */
#endif /* HAVE_AMU_FS_DIRECT */
#ifdef HAVE_AMU_FS_TOPLVL
 &amfs_toplvl_ops,             /* top-level mount F/S */
#endif /* HAVE_AMU_FS_TOPLVL */
#ifdef HAVE_AMU_FS_ERROR
 &amfs_error_ops,              /* error F/S */
#endif /* HAVE_AMU_FS_ERROR */
 0
};


void
ops_showamfstypes(char *buf, size_t l)
{
 struct am_ops **ap;
 int linesize = 0;

 buf[0] = '\0';
 for (ap = vops; *ap; ap++) {
   xstrlcat(buf, (*ap)->fs_type, l);
   if (ap[1])
     xstrlcat(buf, ", ", l);
   linesize += strlen((*ap)->fs_type) + 2;
   if (linesize > 62) {
     linesize = 0;
     xstrlcat(buf, "\n      ", l);
   }
 }
}


static void
ops_show1(char *buf, size_t l, int *linesizep, const char *name)
{
 xstrlcat(buf, name, l);
 xstrlcat(buf, ", ", l);
 *linesizep += strlen(name) + 2;
 if (*linesizep > 60) {
   xstrlcat(buf, "\t\n", l);
   *linesizep = 0;
 }
}


void
ops_showfstypes(char *buf, size_t l)
{
 int linesize = 0;

 buf[0] = '\0';

#ifdef MNTTAB_TYPE_AUTOFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_AUTOFS);
#endif /* MNTTAB_TYPE_AUTOFS */

#ifdef MNTTAB_TYPE_CACHEFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_CACHEFS);
#endif /* MNTTAB_TYPE_CACHEFS */

#ifdef MNTTAB_TYPE_CDFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_CDFS);
#endif /* MNTTAB_TYPE_CDFS */

#ifdef MNTTAB_TYPE_CFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_CFS);
#endif /* MNTTAB_TYPE_CFS */

#ifdef MNTTAB_TYPE_LOFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_LOFS);
#endif /* MNTTAB_TYPE_LOFS */

#ifdef MNTTAB_TYPE_EFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_EFS);
#endif /* MNTTAB_TYPE_EFS */

#ifdef MNTTAB_TYPE_MFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_MFS);
#endif /* MNTTAB_TYPE_MFS */

#ifdef MNTTAB_TYPE_NFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_NFS);
#endif /* MNTTAB_TYPE_NFS */

#ifdef MNTTAB_TYPE_NFS3
 ops_show1(buf, l, &linesize, "nfs3"); /* always hard-code as nfs3 */
#endif /* MNTTAB_TYPE_NFS3 */

#ifdef MNTTAB_TYPE_NULLFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_NULLFS);
#endif /* MNTTAB_TYPE_NULLFS */

#ifdef MNTTAB_TYPE_PCFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_PCFS);
#endif /* MNTTAB_TYPE_PCFS */

#ifdef MNTTAB_TYPE_TFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_TFS);
#endif /* MNTTAB_TYPE_TFS */

#ifdef MNTTAB_TYPE_TMPFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_TMPFS);
#endif /* MNTTAB_TYPE_TMPFS */

#ifdef MNTTAB_TYPE_UFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_UFS);
#endif /* MNTTAB_TYPE_UFS */

#ifdef MNTTAB_TYPE_UMAPFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_UMAPFS);
#endif /* MNTTAB_TYPE_UMAPFS */

#ifdef MNTTAB_TYPE_UNIONFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_UNIONFS);
#endif /* MNTTAB_TYPE_UNIONFS */

#ifdef MNTTAB_TYPE_XFS
 ops_show1(buf, l, &linesize, MNTTAB_TYPE_XFS);
#endif /* MNTTAB_TYPE_XFS */

 /* terminate with a period, newline, and NULL */
 if (buf[strlen(buf)-1] == '\n')
   buf[strlen(buf) - 4] = '\0';
 else
   buf[strlen(buf) - 2] = '\0';
 xstrlcat(buf, ".\n", l);
}


/*
* return string option which is the reverse of opt.
* nosuid -> suid
* quota -> noquota
* ro -> rw
* etc.
* may return pointer to static buffer or subpointer within opt.
*/
static char *
reverse_option(const char *opt)
{
 static char buf[80];

 /* sanity check */
 if (!opt)
   return NULL;

 /* check special cases */
 /* XXX: if this gets too long, rewrite the code more flexibly */
 if (STREQ(opt, "ro")) return "rw";
 if (STREQ(opt, "rw")) return "ro";
 if (STREQ(opt, "bg")) return "fg";
 if (STREQ(opt, "fg")) return "bg";
 if (STREQ(opt, "soft")) return "hard";
 if (STREQ(opt, "hard")) return "soft";

 /* check if string starts with 'no' and chop it */
 if (NSTREQ(opt, "no", 2)) {
   xstrlcpy(buf, &opt[2], sizeof(buf));
 } else {
   /* finally return a string prepended with 'no' */
   xstrlcpy(buf, "no", sizeof(buf));
   xstrlcat(buf, opt, sizeof(buf));
 }
 return buf;
}


/*
* start with an empty string. for each opts1 option that is not
* in opts2, add it to the string (make sure the reverse of it
* isn't in either). finally add opts2. return new string.
* Both opts1 and opts2 must not be null!
* Caller must eventually free the string being returned.
*/
static char *
merge_opts(const char *opts1, const char *opts2)
{
 mntent_t mnt2;                /* place holder for opts2 */
 char *newstr;                 /* new string to return (malloc'ed) */
 char *tmpstr;                 /* temp */
 char *eq;                     /* pointer to whatever follows '=' within temp */
 char oneopt[80];              /* one option w/o value if any */
 char *revoneopt;              /* reverse of oneopt */
 size_t len = strlen(opts1) + strlen(opts2) + 2; /* space for "," and NULL */
 char *s1 = xstrdup(opts1);    /* copy of opts1 to munge */

 /* initialization */
 mnt2.mnt_opts = (char *) opts2;
 newstr = xmalloc(len);
 newstr[0] = '\0';

 for (tmpstr = strtok(s1, ",");
      tmpstr;
      tmpstr = strtok(NULL, ",")) {
   /* copy option to temp buffer */
   xstrlcpy(oneopt, tmpstr, sizeof(oneopt));
   /* if option has a value such as rsize=1024, chop the value part */
   if ((eq = strchr(oneopt, '=')))
     *eq = '\0';
   /* find reverse option of oneopt */
   revoneopt = reverse_option(oneopt);
   /* if option or its reverse exist in opts2, ignore it */
   if (amu_hasmntopt(&mnt2, oneopt) || amu_hasmntopt(&mnt2, revoneopt))
     continue;
   /* add option to returned string */
   if (newstr[0]) {
     xstrlcat(newstr, ",", len);
     xstrlcat(newstr, tmpstr, len);
   } else {
     xstrlcpy(newstr, tmpstr, len);
   }
 }

 /* finally, append opts2 itself */
 if (newstr[0]) {
   xstrlcat(newstr, ",", len);
   xstrlcat(newstr, opts2, len);
 } else {
   xstrlcpy(newstr, opts2, len);
 }

 XFREE(s1);
 return newstr;
}


am_ops *
ops_search(char *type)
{
 am_ops **vp;
 am_ops *rop = NULL;
 for (vp = vops; (rop = *vp); vp++)
   if (STREQ(rop->fs_type, type))
     break;
 return rop;
}


am_ops *
ops_match(am_opts *fo, char *key, char *g_key, char *path, char *keym, char *map)
{
 am_ops *rop = NULL;
 char *link_dir;

 /*
  * First crack the global opts and the local opts
  */
 if (!eval_fs_opts(fo, key, g_key, path, keym, map)) {
   rop = &amfs_error_ops;
 } else if (fo->opt_type == 0) {
   plog(XLOG_USER, "No fs type specified (key = \"%s\", map = \"%s\")", keym, map);
   rop = &amfs_error_ops;
 } else {
   /*
    * Next find the correct filesystem type
    */
   rop = ops_search(fo->opt_type);
   if (!rop) {
     plog(XLOG_USER, "fs type \"%s\" not recognized", fo->opt_type);
     rop = &amfs_error_ops;
   }
 }

 /*
  * Make sure we have a default mount option.
  * Otherwise skip past any leading '-'.
  */
 if (fo->opt_opts == 0)
   fo->opt_opts = xstrdup("rw,defaults");
 else if (*fo->opt_opts == '-') {
   /*
    * We cannot simply do fo->opt_opts++ here since the opts
    * module will try to free the pointer fo->opt_opts later.
    * So just reallocate the thing -- stolcke 11/11/94
    */
   char *old = fo->opt_opts;
   fo->opt_opts = xstrdup(old + 1);
   XFREE(old);
 }

 /*
  * If addopts option was used, then append it to the
  * current options and remote mount options.
  */
 if (fo->opt_addopts) {
   if (STREQ(fo->opt_opts, fo->opt_remopts)) {
     /* optimize things for the common case where opts==remopts */
     char *mergedstr;
     mergedstr = merge_opts(fo->opt_opts, fo->opt_addopts);
     plog(XLOG_INFO, "merge rem/opts \"%s\" add \"%s\" => \"%s\"",
          fo->opt_opts, fo->opt_addopts, mergedstr);
     XFREE(fo->opt_opts);
     XFREE(fo->opt_remopts);
     fo->opt_opts = mergedstr;
     fo->opt_remopts = xstrdup(mergedstr);
   } else {
     char *mergedstr, *remmergedstr;
     mergedstr = merge_opts(fo->opt_opts, fo->opt_addopts);
     plog(XLOG_INFO, "merge opts \"%s\" add \"%s\" => \"%s\"",
          fo->opt_opts, fo->opt_addopts, mergedstr);
     XFREE(fo->opt_opts);
     fo->opt_opts = mergedstr;
     remmergedstr = merge_opts(fo->opt_remopts, fo->opt_addopts);
     plog(XLOG_INFO, "merge remopts \"%s\" add \"%s\" => \"%s\"",
          fo->opt_remopts, fo->opt_addopts, remmergedstr);
     XFREE(fo->opt_remopts);
     fo->opt_remopts = remmergedstr;
   }
 }

 /*
  * Initialize opt_mount_type to "nfs", if it's not initialized already
  */
 if (!fo->opt_mount_type)
   fo->opt_mount_type = "nfs";

 /* Normalize the sublink and make it absolute */
 link_dir = fo->opt_sublink;
 if (link_dir && link_dir[0] && link_dir[0] != '/') {
   link_dir = str3cat((char *) NULL, fo->opt_fs, "/", link_dir);
   normalize_slash(link_dir);
   XFREE(fo->opt_sublink);
   fo->opt_sublink = link_dir;
 }

 /*
  * Check the filesystem is happy
  */
 XFREE(fo->fs_mtab);

 fo->fs_mtab = rop->fs_match(fo);
 if (fo->fs_mtab)
   return rop;

 /*
  * Return error file system
  */
 fo->fs_mtab = amfs_error_ops.fs_match(fo);
 return &amfs_error_ops;
}

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