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/* Usermux leaf node functions
Copyright (C) 1997,2002 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdio.h>
#include <string.h>
#include <pwd.h>
#include <argz.h>
#include <hurd/paths.h>
#include "usermux.h"
/* Read the contents of NODE (a symlink), for USER, into BUF. */
error_t
netfs_attempt_readlink (struct iouser *user, struct node *node, char *buf)
{
assert (node->nn->name);
/* For symlink nodes, the translator spec just contains the link target. */
memcpy (buf, node->nn->trans, node->nn->trans_len);
fshelp_touch (&node->nn_stat, TOUCH_ATIME, usermux_maptime);
return 0;
}
/* For locked node NODE with S_IPTRANS set in its mode, look up the name of
its translator. Store the name into newly malloced storage, and return it
in *ARGZ; set *ARGZ_LEN to the total length.
For usermux, this creates a new translator string by instantiating the
global translator template. */
error_t
netfs_get_translator (struct node *node, char **trans, size_t *trans_len)
{
if (! node->nn->name)
return EINVAL;
else
{
fshelp_touch (&node->nn_stat, TOUCH_ATIME, usermux_maptime);
*trans = 0;
*trans_len = 0;
if (S_ISLNK (node->nn_stat.st_mode))
argz_add (trans, trans_len, _HURD_SYMLINK);
return
argz_append (trans, trans_len, node->nn->trans, node->nn->trans_len);
}
}
/* Create a new leaf node in MUX, with a name NAME, and return the new node
with a single reference in NODE. */
error_t
create_user_node (struct usermux *mux, struct usermux_name *name,
struct passwd *pw, struct node **node)
{
error_t err;
struct node *new;
struct netnode *nn = malloc (sizeof (struct netnode));
if (! nn)
return ENOMEM;
nn->mux = mux;
nn->name = name;
new = netfs_make_node (nn);
if (! new)
{
free (nn);
return ENOMEM;
}
new->nn_stat = mux->stat_template;
new->nn_stat.st_ino = pw->pw_uid + USERMUX_FILENO_UID_OFFSET;
if (strcmp (mux->trans_template, _HURD_SYMLINK) == 0
&& mux->trans_template_len == sizeof _HURD_SYMLINK)
{
err = argz_create_sep (pw->pw_dir, 0, &nn->trans, &nn->trans_len);
new->nn_stat.st_mode = (S_IFLNK | 0666);
new->nn_stat.st_size = nn->trans_len;
}
else
{
unsigned replace_count = 0;
nn->trans = 0; /* Initialize return value. */
nn->trans_len = 0;
err = argz_append (&nn->trans, &nn->trans_len,
mux->trans_template, mux->trans_template_len);
/* Perform any substitutions. */
if (!err && mux->user_pat && *mux->user_pat)
err = argz_replace (&nn->trans, &nn->trans_len,
mux->user_pat, pw->pw_name,
&replace_count);
if (!err && mux->home_pat && *mux->home_pat)
err = argz_replace (&nn->trans, &nn->trans_len,
mux->home_pat, pw->pw_dir,
&replace_count);
if (!err && mux->uid_pat && *mux->uid_pat)
{
char uid_buf[10];
snprintf (uid_buf, sizeof uid_buf, "%d", pw->pw_uid);
err = argz_replace (&nn->trans, &nn->trans_len,
mux->uid_pat, uid_buf,
&replace_count);
}
if (!err && replace_count == 0)
/* Default, if no instances of any pattern occur, is to append the
user home dir. */
err = argz_add (&nn->trans, &nn->trans_len, pw->pw_dir);
if (err && nn->trans_len > 0)
free (nn->trans);
new->nn_stat.st_mode = (S_IFREG | S_IPTRANS | 0666);
new->nn_stat.st_size = 0;
}
new->nn_translated = new->nn_stat.st_mode;
if (err)
{
free (nn);
free (new);
return err;
}
fshelp_touch (&new->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
usermux_maptime);
name->node = new;
*node = new;
return 0;
}
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