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/* Multiplexing filesystems by user
Copyright (C) 1997, 2000, 2002 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 <unistd.h>
#include <argp.h>
#include <argz.h>
#include <error.h>
#include <sys/time.h>
#include <hurd/paths.h>
#include <version.h>
#include "usermux.h"
const char *argp_program_version = STANDARD_HURD_VERSION (usermux);
char *netfs_server_name = "usermux";
char *netfs_server_version = HURD_VERSION;
int netfs_maxsymlinks = 25;
volatile struct mapped_time_value *usermux_mapped_time;
#define OPT_USER_PAT 1
#define OPT_HOME_PAT 2
#define OPT_UID_PAT 3
/* Startup options. */
static const struct argp_option options[] =
{
{ "user-pattern", OPT_USER_PAT, "PAT", 0,
"The string to replace in the translator specification with the user name"
" (default `${user}')" },
{ "home-pattern", OPT_HOME_PAT, "PAT", 0,
"The string to replace in the translator specification with the user's"
" home directory (default `${home}')" },
{ "uid-pattern", OPT_UID_PAT, "PAT", 0,
"The string to replace in the translator specification with the uid"
" (default `${uid}')" },
{ "clear-patterns", 'C', 0, 0,
"Reset all patterns to empty; this option may then be followed by options"
" to set specific patterns" },
{ 0 }
};
static const char args_doc[] = "[TRANSLATOR [ARG...]]";
static const char doc[] =
"A translator for invoking user-specific translators."
"\vThis translator appears like a directory in which user names can be"
" looked up, and will start TRANSLATOR to service each resulting node."
" If no pattern occurs in the translator specification, the users's"
" home directory is appended to it instead; TRANSLATOR defaults to"
" " _HURD_SYMLINK ".";
int
main (int argc, char **argv)
{
error_t err;
struct stat ul_stat;
mach_port_t bootstrap;
struct usermux mux =
{ user_pat: "${user}", home_pat: "${home}", uid_pat: "${uid}" };
struct netnode root_nn = { mux: &mux };
error_t parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
case OPT_USER_PAT: mux.user_pat = arg; break;
case OPT_HOME_PAT: mux.home_pat = arg; break;
case OPT_UID_PAT: mux.uid_pat = arg; break;
case 'C': memset (&mux, 0, sizeof mux); break;
case ARGP_KEY_NO_ARGS:
memset (&mux, 0, sizeof mux); /* Default doesn't use them;
be careful. */
return argz_create_sep (_HURD_SYMLINK, 0,
&mux.trans_template, &mux.trans_template_len);
case ARGP_KEY_ARGS:
/* Steal the entire tail of arg vector for our own use. */
return argz_create (state->argv + state->next,
&mux.trans_template, &mux.trans_template_len);
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
struct argp argp = { options, parse_opt, args_doc, doc };
/* Parse our command line arguments. */
argp_parse (&argp, argc, argv, 0, 0, 0);
task_get_bootstrap_port (mach_task_self (), &bootstrap);
netfs_init ();
/* Create the root node (some attributes initialized below). */
netfs_root_node = netfs_make_node (&root_nn);
if (! netfs_root_node)
error (5, ENOMEM, "Cannot create root node");
err = maptime_map (0, 0, &usermux_maptime);
if (err)
error (6, err, "Cannot map time");
/* Handshake with the party trying to start the translator. */
mux.underlying = netfs_startup (bootstrap, 0);
/* We inherit various attributes from the node underlying this translator. */
err = io_stat (mux.underlying, &ul_stat);
if (err)
error (7, err, "Cannot stat underlying node");
/* MUX.stat_template contains some fields that are inherited by all nodes
we create. */
mux.stat_template.st_uid = ul_stat.st_uid;
mux.stat_template.st_gid = ul_stat.st_gid;
mux.stat_template.st_author = ul_stat.st_author;
mux.stat_template.st_fsid = getpid ();
mux.stat_template.st_nlink = 1;
mux.stat_template.st_fstype = FSTYPE_MISC;
/* We implement symlinks directly, and everything else as a real
translator. */
if (strcmp (mux.trans_template, _HURD_SYMLINK) == 0)
mux.stat_template.st_mode = S_IFLNK | 0666;
else
mux.stat_template.st_mode = S_IFREG | S_IPTRANS | 0666;
/* Initialize the root node's stat information. */
netfs_root_node->nn_stat = mux.stat_template;
netfs_root_node->nn_stat.st_ino = 2;
netfs_root_node->nn_stat.st_mode =
S_IFDIR | (ul_stat.st_mode & ~S_IFMT & ~S_ITRANS);
netfs_root_node->nn_translated = 0;
fshelp_touch (&netfs_root_node->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
usermux_maptime);
for (;;) /* ?? */
netfs_server_loop ();
}
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