/*      $NetBSD: wr_atab.c,v 1.1.1.3 2015/01/17 16:34:17 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/fsinfo/wr_atab.c
*
*/

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


/*
* Write a sequence of automount mount map entries
*/
static int
write_amount_info(FILE *af, automount *ap,  u_int sk)
{
 int errors = 0;

 if (ap->a_mount) {
   /*
    * A pseudo-directory.
    * This can also be a top-level directory, in which
    * case the type:=auto is not wanted...
    *
    * type:=auto;fs:=${map};pref:=whatever/
    */
   automount *ap2;
   if (strlen(ap->a_name) > sk) {
     fprintf(af, "%s type:=auto;fs:=${map};pref:=%s/\n",
             ap->a_name + sk, ap->a_name + sk);
   }
   ITER(ap2, automount, ap->a_mount)
     errors += write_amount_info(af, ap2, sk);
 } else if (ap->a_hardwiredfs) {

   /*
    * A hardwired filesystem "hostname:path"
    * rhost:=hostname;rfs:=path
    */
   char *key = ap->a_name + sk;
   char *hostname = ap->a_hardwiredfs;
   char *path = strrchr(hostname, (int) ':');

   if (path == NULL) {
     fprintf(stderr, "%s: %s not an NFS filesystem\n", ap->a_name, ap->a_hardwiredfs);
     errors++;
   } else {
     *path = '\0';
     path++;

     /*
      * Output the map key
      */
     fputs(key, af);
     fprintf(af, " rhost:=%s", hostname);
     fprintf(af, ";rfs:=%s", path);
     if (ap->a_opts && !STREQ(ap->a_opts, "")) {
       fprintf(af, ";%s", ap->a_opts);
     }
     fputc('\n', af);
     path--;
     *path = ':';
   }
 } else if (ap->a_mounted) {

   /*
    * A mounted partition
    * type:=link [ link entries ] type:=nfs [ nfs entries ]
    */
   dict_data *dd;
   dict_ent *de = ap->a_mounted;
   int done_type_link = 0;
   char *key = ap->a_name + sk;

   /*
    * Output the map key
    */
   fputs(key, af);

   /*
    * First output any Link locations that would not
    * otherwise be correctly mounted.  These refer
    * to filesystem which are not mounted in the same
    * place which the automounter would use.
    */
   ITER(dd, dict_data, &de->de_q) {
     fsi_mount *mp = (fsi_mount *) dd->dd_data;
     /*
      * If the mount point and the exported volname are the
      * same then this filesystem will be recognized by
      * the restart code - so we don't need to put out a
      * special rule for it.
      */
     if (mp->m_dk->d_host->h_lochost) {
       char amountpt[1024];
       compute_automount_point(amountpt, sizeof(amountpt),
                               mp->m_dk->d_host, mp->m_exported->m_volname);
       if (!STREQ(mp->m_dk->d_mountpt, amountpt)) {
         /*
          * ap->a_volname is the name of the aliased volume
          * mp->m_name is the mount point of the filesystem
          * mp->m_volname is the volume name of the filesystems
          */

         /*
          * Find length of key and volume names
          */
         int avlen = strlen(ap->a_volname);
         int mnlen = strlen(mp->m_volname);

         /*
          * Make sure a -type:=link is output once
          */
         if (!done_type_link) {
           done_type_link = 1;
           fputs(" -type:=link", af);
         }

         /*
          * Output a selector for the hostname,
          * the device from which to mount and
          * where to mount.  This will correspond
          * to the values output for the fstab.
          */
         if (mp->m_dk->d_host->h_lochost)
           fprintf(af, " host==%s", mp->m_dk->d_host->h_lochost);
         else
           fprintf(af, " hostd==%s", mp->m_dk->d_host->h_hostname);
         fprintf(af, ";fs:=%s", mp->m_name);

         /*
          * ... and a sublink if needed
          */
         if (mnlen < avlen) {
           char *sublink = ap->a_volname + mnlen + 1;
           fprintf(af, "/%s", sublink);
         }
         fputs(" ||", af);
       }
     }
   }

   /*
    * Next do the NFS locations
    */
   if (done_type_link)
     fputs(" -", af);

   ITER(dd, dict_data, &de->de_q) {
     fsi_mount *mp = (fsi_mount *) dd->dd_data;
     int namelen = mp->m_name_len;
     int exp_namelen = mp->m_exported->m_name_len;
     int volnlen = strlen(ap->a_volname);
     int mvolnlen = strlen(mp->m_volname);

     fputc(' ', af);

     /*
      * Output any selectors
      */
     if (mp->m_sel)
       fprintf(af, "%s;", mp->m_sel);

     /*
      * Print host and volname of exported filesystem
      */
     fprintf(af, "rhost:=%s",
             mp->m_dk->d_host->h_lochost ?
             mp->m_dk->d_host->h_lochost :
             mp->m_dk->d_host->h_hostname);
     fprintf(af, ";rfs:=%s", mp->m_exported->m_volname);
     if (ap->a_opts && !STREQ(ap->a_opts, "")) {
       fprintf(af, ";%s", ap->a_opts);
     }

     /*
      * Now determine whether a sublink is required.
      */
     if (exp_namelen < namelen || mvolnlen < volnlen) {
       char sublink[1024];
       sublink[0] = '\0';
       if (exp_namelen < namelen) {
         xstrlcat(sublink, mp->m_name + exp_namelen + 1, sizeof(sublink));
         if (mvolnlen < volnlen)
           xstrlcat(sublink, "/", sizeof(sublink));
       }
       if (mvolnlen < volnlen)
         xstrlcat(sublink, ap->a_volname + mvolnlen + 1, sizeof(sublink));

       fprintf(af, ";sublink:=%s", sublink);
     }
   }
   fputc('\n', af);
 } else if (ap->a_symlink) {

   /*
    * A specific link.
    *
    * type:=link;fs:=whatever
    */
   fprintf(af, "%s type:=link;fs:=%s\n", ap->a_name + sk, ap->a_symlink);
 }

 return errors;
}


/*
* Write a single automount configuration file
*/
static int
write_amount( qelem *q, char *def)
{
 automount *ap;
 int errors = 0;
 int direct = 0;

 /*
  * Output all indirect maps
  */
 ITER(ap, automount, q) {
   FILE *af;
   char *p;

   /*
    * If there is no a_mount node then this is really
    * a direct mount, so just keep a count and continue.
    * Direct mounts are output into a special file during
    * the second pass below.
    */
   if (!ap->a_mount) {
     direct++;
     continue;
   }

   p = strrchr(ap->a_name, '/');
   if (!p)
     p = ap->a_name;
   else
     p++;

   af = pref_open(mount_pref, p, gen_hdr, ap->a_name);
   if (af) {
     show_new(ap->a_name);
     fputs("/defaults ", af);
     if (*def)
       fprintf(af, "%s;", def);
     fputs("type:=nfs\n", af);
     errors += write_amount_info(af, ap, strlen(ap->a_name) + 1);
     errors += pref_close(af);
   }
 }

 /*
  * Output any direct map entries which were found during the
  * previous pass over the data.
  */
 if (direct) {
   FILE *af = pref_open(mount_pref, "direct.map", info_hdr, "direct mount");

   if (af) {
     show_new("direct mounts");
     fputs("/defaults ", af);
     if (*def)
       fprintf(af, "%s;", def);
     fputs("type:=nfs\n", af);
     ITER(ap, automount, q)
     if (!ap->a_mount)
         errors += write_amount_info(af, ap, 1);
     errors += pref_close(af);
   }
 }
 return errors;
}


/*
* Write all the needed automount configuration files
*/
int
write_atab(qelem *q)
{
 int errors = 0;

 if (mount_pref) {
   auto_tree *tp;
   show_area_being_processed("write automount", 5);
   ITER(tp, auto_tree, q)
     errors += write_amount(tp->t_mount, tp->t_defaults);
 }

 return errors;
}

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