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/* Hostmux leaf node functions
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 <string.h>
#include <argz.h>
#include "hostmux.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);
memcpy (buf, node->nn->name->canon, node->nn_stat.st_size);
fshelp_touch (&node->nn_stat, TOUCH_ATIME, hostmux_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 hostmux, this creates a new translator string by instantiating the
global translator template. */
error_t
netfs_get_translator (struct node *node, char **argz, size_t *argz_len)
{
if (! node->nn->name)
return EINVAL;
else
{
error_t err = 0;
unsigned replace_count = 0;
struct hostmux *mux = node->nn->mux;
*argz = 0; /* Initialize return value. */
*argz_len = 0;
/* Return a copy of MUX's translator template, with occurances of
HOST_PAT replaced by the canonical hostname. */
err = argz_append (argz, argz_len,
mux->trans_template, mux->trans_template_len);
if (! err)
err = argz_replace (argz, argz_len,
mux->host_pat, node->nn->name->canon,
&replace_count);
if (!err && replace_count == 0)
/* Default, if no instances of HOST_PAT occur, is to append the
hostname. */
err = argz_add (argz, argz_len, node->nn->name->canon);
if (err && *argz_len > 0)
free (*argz);
return err;
}
}
/* 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_host_node (struct hostmux *mux, struct hostmux_name *name,
struct node **node)
{
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 = name->fileno;
if (strcmp (name->name, name->canon) == 0)
/* The real name of the host, make a real node. */
{
new->nn_stat.st_mode = (S_IFREG | S_IPTRANS | 0666);
new->nn_stat.st_size = 0;
}
else
/* An alias for this host, make a symlink instead. */
{
new->nn_stat.st_mode = (S_IFLNK | 0666);
new->nn_stat.st_size = strlen (name->canon);
}
fshelp_touch (&new->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
hostmux_maptime);
name->node = new;
*node = new;
return 0;
}
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