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/*
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "trans.h"
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <hurd/fsys.h>
error_t
fshelp_fetch_root (struct transbox *box, file_t dotdot,
uid_t *uids, int uids_len,
uid_t *gids, int gids_len,
int flags, fshelp_callback_t callback,
retry_type *retry, char *retryname,
file_t *root)
{
error_t err;
mach_port_t control;
do
{
if (box->active == MACH_PORT_NULL)
do
{
mach_port_t underlying;
uid_t uid, gid;
char *argz;
int argz_len;
error_t err;
mach_port_t ports[INIT_PORT_MAX];
int ints[INIT_INT_MAX];
mach_port_t fds[STDERR_FILENO + 1];
auth_t ourauth, newauth;
int uidarray[2], gidarray[2];
mach_port_t
reauth (mach_port_t port)
{
mach_port_t rend, ret;
error_t err;
rend = mach_reply_port ();
err = io_reauthenticate (port, rend,
MACH_MSG_TYPE_MAKE_SEND);
assert_perror (err);
err = auth_user_authenticate (newauth, port, rend,
MACH_MSG_TYPE_MAKE_SEND,
&ret);
if (err)
ret = MACH_PORT_NULL;
mach_port_destroy (mach_task_self (), rend);
mach_port_deallocate (mach_task_self (), port);
return ret;
}
err = (*callback) (box->cookie, &underlying, &uid,
&gid, &argz, &argz_len);
if (err)
return err;
mutex_lock (&box->innerlock); /* cancellation point XXX */
mutex_unlock (box->lock);
ourauth = getauth ();
uidarray[0] = uidarray[1] = uid;
gidarray[0] = gidarray[1] = gid;
err = auth_makeauth (ourauth, MACH_PORT_NULL, 0,
MACH_MSG_TYPE_MAKE_SEND,
uidarray, 1, uidarray, 2,
gidarray, 1, gidarray, 2, &newauth);
assert_perror (err);
bzero (ports, INIT_PORT_MAX * sizeof (mach_port_t));
bzero (fds, (STDERR_FILENO + 1) * sizeof (mach_port_t));
bzero (ints, INIT_INT_MAX * sizeof (int));
ports[INIT_PORT_CWDIR] = reauth (getcwdir ());
ports[INIT_PORT_CRDIR] = reauth (getcrdir ());
ports[INIT_PORT_AUTH] = newauth;
fds[STDERR_FILENO] = reauth (getdport (STDERR_FILENO));
err = fshelp_start_translator_long (reauth (underlying),
MACH_MSG_TYPE_MOVE_SEND,
argz, argz, argz_len,
fds, STDERR_FILENO + 1,
MACH_MSG_TYPE_MOVE_SEND,
ports, INIT_PORT_MAX,
MACH_MSG_TYPE_MOVE_SEND,
ints, INIT_INT_MAX,
0, &box->active);
mutex_unlock (&box->innerlock);
if (err)
return err;
mutex_lock (box->lock);
/* The loop here is because between the interlock unlock and
the reacquire of the node lock, someone might have deallocated
the port we just added. */
}
while (box->active == MACH_PORT_NULL);
control = box->active;
mach_port_mod_refs (mach_task_self (), control,
MACH_PORT_RIGHT_SEND, 1);
mutex_unlock (box->lock);
/* Cancellation point XXX */
err = fsys_getroot (control, dotdot, MACH_MSG_TYPE_COPY_SEND,
uids, uids_len, gids, gids_len, flags,
retry, retryname, root);
mutex_lock (box->lock);
if ((err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
&& control == box->active)
fshelp_set_active (box, MACH_PORT_NULL);
mach_port_deallocate (mach_task_self (), control);
}
while (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED);
mach_port_deallocate (mach_task_self (), dotdot);
return err;
}
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