/*      $NetBSD: restart.c,v 1.1.1.3 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/restart.c
*
*/

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


static void
restart_fake_mntfs(mntent_t *me, am_ops *fs_ops)
{
 mntfs *mf;
 am_opts mo;
 char *cp;

 /*
  * Partially fake up an opts structure
  */
 memset(&mo, 0, sizeof(mo));
 mo.opt_rhost = NULL;
 mo.opt_rfs = NULL;
 cp = strchr(me->mnt_fsname, ':');
 if (cp) {
   *cp = '\0';
   mo.opt_rhost = xstrdup(me->mnt_fsname);
   mo.opt_rfs = xstrdup(cp + 1);
   *cp = ':';
 } else if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) {
   /*
    * Hacky workaround for mnttab NFS entries that only list the server
    */
   plog(XLOG_WARNING, "NFS server entry assumed to be %s:/", me->mnt_fsname);
   mo.opt_rhost = xstrdup(me->mnt_fsname);
   mo.opt_rfs = xstrdup("/");
   me->mnt_fsname = str3cat(me->mnt_fsname, mo.opt_rhost, ":", "/");
 }
 mo.opt_fs = me->mnt_dir;
 mo.opt_opts = me->mnt_opts;

 /*
  * Make a new mounted filesystem
  */
 mf = find_mntfs(fs_ops, &mo, me->mnt_dir,
                 me->mnt_fsname, "", me->mnt_opts, "");
 if (mf->mf_refc == 1) {
   mf->mf_flags |= MFF_RESTART | MFF_MOUNTED;
   mf->mf_error = 0;                /* Already mounted correctly */
   /*
    * Only timeout non-NFS entries
    */
   if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS))
     mf->mf_flags |= MFF_RSTKEEP;
   if (fs_ops->fs_init) {
     /*
      * Don't care whether this worked since
      * it is checked again when the fs is
      * inherited.
      */
     (void) (*fs_ops->fs_init) (mf);
   }
   plog(XLOG_INFO, "%s restarted fstype %s on %s, flags 0x%x",
        me->mnt_fsname, fs_ops->fs_type, me->mnt_dir, mf->mf_flags);
 } else {
   /* Something strange happened - two mounts at the same place! */
   free_mntfs(mf);
 }
 /*
  * Clean up mo
  */
 XFREE(mo.opt_rhost);
 XFREE(mo.opt_rfs);
}


/*
* Handle an amd restart.
*
* Scan through the mount list finding all "interesting" mount points.
* Next hack up partial data structures and add the mounted file
* system to the list of known filesystems.
*
* This module relies on internal details of other components.  If
* you change something else make *sure* restart() still works.
*/
void
restart(void)
{
 mntlist *ml, *mlp;

 /*
  * Read the existing mount table.  For each entry, find nfs, ufs or auto
  * mounts and create a partial am_node to represent it.
  */
 for (mlp = ml = read_mtab("restart", mnttab_file_name);
      mlp;
      mlp = mlp->mnext) {
   mntent_t *me = mlp->mnt;
   am_ops *fs_ops = NULL;

   if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) {
     /*
      * NFS entry, or possibly an Amd entry...
      * The mnt_fsname for daemon mount points is
      *        host:(pidXXX)
      * or (seen on Solaris)
      *        host:daemon(pidXXX)
      */
     char *colon = strchr(me->mnt_fsname, ':');
     if (colon && strstr(colon, "(pid"))
       continue;
   }

   /* Search for the correct filesystem ops */
   fs_ops = ops_search(me->mnt_type);

   /*
    * Catch everything else with symlinks to
    * avoid recursive mounts.  This is debatable...
    */
   if (!fs_ops)
     fs_ops = &amfs_link_ops;

   restart_fake_mntfs(me, fs_ops);
 }

 /*
  * Free the mount list
  */
 free_mntlist(ml);
}


/*
* Handle an amd restart for amd's own mount points.
*
* Scan through the mount list finding all daemon mount points
* (determined by the presence of a pid inside the mount info).
* Next hack up partial data structures and add the mounted file
* system to the list of known filesystems.
*
* This module relies on internal details of other components.  If
* you change something else make *sure* restart() still works.
*/
void
restart_automounter_nodes(void)
{
 mntlist *ml, *mlp;
 /* reasonably sized list of restarted nfs ports */
 u_short old_ports[256];

 memset((voidp) &old_ports, 0, sizeof(u_short) * 256);

 /*
  * Read the existing mount table.  For each entry, find nfs, ufs or auto
  * mounts and create a partial am_node to represent it.
  */
 for (mlp = ml = read_mtab("restart", mnttab_file_name);
      mlp;
      mlp = mlp->mnext) {
   mntent_t *me = mlp->mnt;
   am_ops *fs_ops = NULL;
   char *colon;
   long pid;
   u_short port;
   int err;

   if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS))
     continue;                 /* to next mlp */
   /*
    * NFS entry, or possibly an Amd entry...
    * The mnt_fsname for daemon mount points is
    *     host:(pidXXX)
    * or (seen on Solaris)
    *     host:daemon(pidXXX)
    */
   colon = strchr(me->mnt_fsname, ':');
   if (!colon || !strstr(colon, "(pid"))
     continue;
   /* if got here, then we matched an existing Amd mount point */
   err = 1;

   plog(XLOG_WARNING, "%s is an existing automount point", me->mnt_dir);

   /* Is the old automounter still alive? */
   if (sscanf(colon, "%*[^(](pid%ld%*[,)]", &pid) != 1) {
     plog(XLOG_WARNING, "Can't parse pid in %s", me->mnt_fsname);
     goto give_up;
   }
   if (kill(pid, 0) != -1 || errno != ESRCH) {
     plog(XLOG_WARNING, "Automounter (pid: %ld) still alive", pid);
     goto give_up;
   }

   /*
    * Do we have a map for this mount point?  Who cares, we'll restart
    * anyway -- getting ESTALE is way better than hanging.
    */

   /* Can we restart it? Only if it tells us what port it was using... */
   if (sscanf(colon, "%*[^,],port%hu)", &port) != 1) {
     plog(XLOG_WARNING, "No port specified for %s", me->mnt_fsname);
     goto give_up;
   }

   /* Maybe we already own that port... */
   if (port != nfs_port) {
     int i;
     for (i = 0; i < 256; i++) {
       if (old_ports[i] == port ||
           old_ports[i] == 0)
         break;
     }
     if (i == 256) {
       plog(XLOG_WARNING, "Too many open ports (256)");
       goto give_up;
     }

     if (old_ports[i] == 0) {
       int soNFS;
       SVCXPRT *nfsxprt;
       if (create_nfs_service(&soNFS, &port, &nfsxprt, nfs_dispatcher,
           get_nfs_dispatcher_version(nfs_dispatcher)) != 0) {
         plog(XLOG_WARNING, "Can't bind to port %u", port);
         goto give_up;
       }
       old_ports[i] = nfs_port = port;
     }
   }
   err = 0;

 give_up:
   if (err) {
     plog(XLOG_WARNING, "Can't restart %s, leaving it alone", me->mnt_dir);
     fs_ops = &amfs_link_ops;
   } else {
     fs_ops = &amfs_toplvl_ops;
   }

   restart_fake_mntfs(me, fs_ops);
 } /* end of "for (mlp" */

 /* free the mount list */
 free_mntlist(ml);
}

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