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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);
touch (node, TOUCH_ATIME);
return 0;
}
/* Append BUF, of length BUF_LEN to *TO, of length *TO_LEN, reallocating and
updating *TO & *TO_LEN appropriately. If an allocation error occurs,
*TO's old value is freed, and *TO is set to 0. */
static void
str_append (char **to, size_t *to_len, const char *buf, const size_t buf_len)
{
size_t new_len = *to_len + buf_len;
char *new_to = realloc (*to, new_len + 1);
if (new_to)
{
memcpy (new_to + *to_len, buf, buf_len);
new_to[new_len] = '\0';
*to = new_to;
*to_len = new_len;
}
else
{
free (*to);
*to = 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;
char *arg = 0;
int did_replace = 0;
struct hostmux *mux = node->nn->mux;
char *template = mux->trans_template;
size_t template_len = mux->trans_template_len;
char *host_pat = mux->host_pat;
const char *host = node->nn->name->canon;
size_t host_len = strlen (host);
*argz = 0; /* Initialize return value. */
*argz_len = 0;
if (host_pat)
{
size_t host_pat_len = strlen (host_pat);
while (!err && (arg = argz_next (template, template_len, arg)))
{
char *match = strstr (arg, host_pat);
if (match)
{
char *from = match + host_pat_len;
size_t to_len = match - arg;
char *to = strndup (arg, to_len);
while (to && from)
{
str_append (&to, &to_len, host, host_len);
if (to)
{
match = strstr (from, host_pat);
if (match)
{
str_append (&to, &to_len, from, match - from);
from = match + host_pat_len;
}
else
{
str_append (&to, &to_len, from, strlen (from));
from = 0;
}
}
}
if (to)
{
err = argz_add (argz, argz_len, to);
free (to);
}
else
err = ENOMEM;
did_replace = 1;
}
else
err = argz_add (argz, argz_len, arg);
}
}
else
err = argz_append (argz, argz_len, template, template_len);
if (!err && !did_replace)
err = argz_add (argz, argz_len, host);
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);
}
name->node = new;
*node = new;
return 0;
}
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