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/* Multiplexing filesystems by host
Copyright (C) 1997, 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 <version.h>
#include "hostmux.h"
const char *argp_program_version = STANDARD_HURD_VERSION (hostmux);
char *netfs_server_name = "hostmux";
char *netfs_server_version = HURD_VERSION;
int netfs_maxsymlinks = 25;
volatile struct mapped_time_value *hostmux_maptime;
#define DEFAULT_HOST_PAT "${host}"
/* Startup options. */
static const struct argp_option options[] =
{
{ "host-pattern", 'H', "PAT", 0,
"The string to replace in the translator specification with the hostname;"
" if empty, or doesn't occur, the hostname is appended as additional"
" argument instead (default `" DEFAULT_HOST_PAT "')" },
{ "canonicalize", 'C', 0, 0,
"Canonicalize hostname before passing it to TRANSLATOR, aliases will"
" show up as symbolic links to the canonicalized entry" },
{ 0 }
};
static const char args_doc[] = "TRANSLATOR [ARG...]";
static const char doc[] =
"A translator for invoking host-specific translators."
"\vThis translator appears like a directory in which hostnames can be"
" looked up, and will start TRANSLATOR to service each resulting node.";
/* Return an argz string describing the current options. Fill *ARGZ
with a pointer to newly malloced storage holding the list and *LEN
to the length of that storage. */
error_t
netfs_append_args (char **argz, size_t *argz_len)
{
char buf[80];
error_t err = 0;
struct hostmux *mux = netfs_root_node->nn->mux;
#define FOPT(fmt, arg) \
do { \
if (! err) \
{ \
snprintf (buf, sizeof buf, fmt, arg); \
err = argz_add (argz, argz_len, buf); \
} \
} while (0)
if (strcmp (mux->host_pat, DEFAULT_HOST_PAT) != 0)
FOPT ("--host-pattern=%s", mux->host_pat);
if (! err)
err = argz_append (argz, argz_len,
mux->trans_template, mux->trans_template_len);
return err;
}
int
main (int argc, char **argv)
{
error_t err;
struct stat ul_stat;
mach_port_t bootstrap;
struct hostmux mux = { host_pat: DEFAULT_HOST_PAT, next_fileno: 10 };
struct netnode root_nn = { mux: &mux };
error_t parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
case 'H':
mux.host_pat = arg; break;
case 'C':
mux.canonicalize = 1; break;
case ARGP_KEY_NO_ARGS:
argp_usage (state);
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, ARGP_IN_ORDER, 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, &hostmux_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;
/* 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;
/* If the underlying node isn't a directory, propagate read permission to
execute permission since we need that for lookups. */
if (! S_ISDIR (ul_stat.st_mode))
{
if (ul_stat.st_mode & S_IRUSR)
netfs_root_node->nn_stat.st_mode |= S_IXUSR;
if (ul_stat.st_mode & S_IRGRP)
netfs_root_node->nn_stat.st_mode |= S_IXGRP;
if (ul_stat.st_mode & S_IROTH)
netfs_root_node->nn_stat.st_mode |= S_IXOTH;
}
fshelp_touch (&netfs_root_node->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
hostmux_maptime);
for (;;) /* ?? */
netfs_server_loop ();
}
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