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/* Translator for S_IFLNK nodes
Copyright (C) 1994, 2000, 2001, 2002 Free Software Foundation
This program 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.
This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <argp.h>
#include <hurd/fsys.h>
#include <fcntl.h>
#include <errno.h>
#include <error.h>
#include <version.h>
#include "fsys_S.h"
mach_port_t realnode;
/* We return this for O_NOLINK lookups */
mach_port_t realnodenoauth;
/* We return this for non O_NOLINK lookups */
char *linktarget;
extern int fsys_server (mach_msg_header_t *, mach_msg_header_t *);
const char *argp_program_version = STANDARD_HURD_VERSION (symlink);
static const struct argp_option options[] =
{
{ 0 }
};
static const char args_doc[] = "TARGET";
static const char doc[] = "A translator for symlinks."
"\vA symlink is an alias for another node in the filesystem."
"\n"
"\nA symbolic link refers to its target `by name', and contains no actual"
" reference to the target. The target referenced by the symlink is"
" looked up in the namespace of the client.";
/* Parse a single option/argument. */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
if (key == ARGP_KEY_ARG && state->arg_num == 0)
linktarget = arg;
else if (key == ARGP_KEY_ARG || key == ARGP_KEY_NO_ARGS)
argp_usage (state);
else
return ARGP_ERR_UNKNOWN;
return 0;
}
static struct argp argp = { options, parse_opt, args_doc, doc };
int
main (int argc, char **argv)
{
mach_port_t bootstrap;
mach_port_t control;
error_t err;
/* Parse our options... */
argp_parse (&argp, argc, argv, 0, 0, 0);
task_get_bootstrap_port (mach_task_self (), &bootstrap);
if (bootstrap == MACH_PORT_NULL)
error (1, 0, "Must be started as a translator");
linktarget = argv[1];
/* Reply to our parent */
mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE, &control);
mach_port_insert_right (mach_task_self (), control, control,
MACH_MSG_TYPE_MAKE_SEND);
err =
fsys_startup (bootstrap, 0, control, MACH_MSG_TYPE_COPY_SEND, &realnode);
mach_port_deallocate (mach_task_self (), control);
mach_port_deallocate (mach_task_self (), bootstrap);
if (err)
error (1, err, "Starting up translator");
io_restrict_auth (realnode, &realnodenoauth, 0, 0, 0, 0);
mach_port_deallocate (mach_task_self (), realnode);
/* Mark us as important. */
mach_port_t proc = getproc ();
if (proc == MACH_PORT_NULL)
error (2, err, "cannot get a handle to our process");
err = proc_mark_important (proc);
/* This might fail due to permissions or because the old proc server
is still running, ignore any such errors. */
if (err && err != EPERM && err != EMIG_BAD_ID)
error (2, err, "Cannot mark us as important");
mach_port_deallocate (mach_task_self (), proc);
/* Launch */
while (1)
{
/* The timeout here is 10 minutes */
err = mach_msg_server_timeout (fsys_server, 0, control,
MACH_RCV_TIMEOUT, 1000 * 60 * 10);
if (err == MACH_RCV_TIMED_OUT)
exit (0);
}
}
kern_return_t
S_fsys_getroot (mach_port_t fsys_t,
mach_port_t dotdotnode,
const id_t *uids,
mach_msg_type_number_t nuids,
const id_t *gids,
mach_msg_type_number_t ngids,
int flags,
retry_type *do_retry,
string_t retry_name,
mach_port_t *ret,
mach_msg_type_name_t *rettype)
{
if (flags & O_NOLINK)
{
/* Return our underlying node. */
*ret = realnodenoauth;
*rettype = MACH_MSG_TYPE_COPY_SEND;
*do_retry = FS_RETRY_REAUTH;
retry_name[0] = '\0';
return 0;
}
else
{
/* Return telling the user to follow the link */
strcpy (retry_name, linktarget);
if (linktarget[0] == '/')
{
*do_retry = FS_RETRY_MAGICAL;
*ret = MACH_PORT_NULL;
*rettype = MACH_MSG_TYPE_COPY_SEND;
}
else
{
*do_retry = FS_RETRY_REAUTH;
*ret = dotdotnode;
*rettype = MACH_MSG_TYPE_MOVE_SEND;
}
}
return 0;
}
kern_return_t
S_fsys_goaway (mach_port_t control, int flags)
{
exit (0);
}
kern_return_t
S_fsys_syncfs (mach_port_t control,
int wait,
int recurse)
{
return 0;
}
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