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/*
Copyright (C) 1995,96,99,2000,02 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, void *cookie,
file_t dotdot,
struct iouser *user,
int flags,
fshelp_fetch_root_callback1_t callback1,
fshelp_fetch_root_callback2_t callback2,
retry_type *retry, char *retryname,
file_t *root)
{
error_t err;
mach_port_t control;
int cancel;
int i;
start_over:
if (box->active != MACH_PORT_NULL)
assert ((box->flags & TRANSBOX_STARTING) == 0);
else
{
uid_t uid, gid;
char *argz;
size_t 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;
mach_port_t reauth (mach_port_t port) /* Consumes PORT. */
{
mach_port_t rend, ret;
error_t err;
if (port == MACH_PORT_NULL)
return port;
if (ourauth == MACH_PORT_NULL)
/* We have no auth server, so we aren't doing reauthentications.
Just pass on our own ports directly. */
return port;
rend = mach_reply_port ();
/* MAKE_SEND is safe here because we destroy REND ourselves. */
err = io_reauthenticate (port, rend,
MACH_MSG_TYPE_MAKE_SEND);
mach_port_deallocate (mach_task_self (), port);
if (! err)
err = auth_user_authenticate (newauth, rend,
MACH_MSG_TYPE_MAKE_SEND, &ret);
if (err)
ret = MACH_PORT_NULL;
mach_port_mod_refs (mach_task_self (), rend, MACH_PORT_RIGHT_RECEIVE, -1);
return ret;
}
error_t fetch_underlying (int flags, mach_port_t *underlying,
mach_msg_type_name_t *underlying_type,
task_t task, void *cookie)
{
return
(*callback2) (box->cookie, cookie, flags,
underlying, underlying_type);
}
if (box->flags & TRANSBOX_STARTING)
{
box->flags |= TRANSBOX_WANTED;
cancel = hurd_condition_wait (&box->wakeup, box->lock);
if (cancel)
return EINTR;
goto start_over;
}
box->flags |= TRANSBOX_STARTING;
mutex_unlock (box->lock);
err = (*callback1) (box->cookie, cookie, &uid, &gid, &argz, &argz_len);
if (err)
goto return_error;
ourauth = getauth ();
if (ourauth == MACH_PORT_NULL)
newauth = ourauth;
else
{
uid_t uidarray[2] = { uid, uid };
gid_t gidarray[2] = { gid, gid };
err = auth_makeauth (ourauth, 0, MACH_MSG_TYPE_COPY_SEND, 0,
uidarray, 1, uidarray, 2,
gidarray, 1, gidarray, 2, &newauth);
if (err)
goto return_error;
}
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] = dotdot;
ports[INIT_PORT_CRDIR] = reauth (getcrdir ());
ports[INIT_PORT_AUTH] = newauth;
fds[STDERR_FILENO] = reauth (getdport (STDERR_FILENO));
err = fshelp_start_translator_long (fetch_underlying, NULL,
argz, argz, argz_len,
fds, MACH_MSG_TYPE_COPY_SEND,
STDERR_FILENO + 1,
ports, MACH_MSG_TYPE_COPY_SEND,
INIT_PORT_MAX,
ints, INIT_INT_MAX,
uid,
0, &control);
for (i = 0; i <= STDERR_FILENO; i++)
mach_port_deallocate (mach_task_self (), fds[i]);
for (i = 0; i < INIT_PORT_MAX; i++)
if (i != INIT_PORT_CWDIR)
mach_port_deallocate (mach_task_self (), ports[i]);
mutex_lock (box->lock);
free (argz);
return_error:
box->flags &= ~TRANSBOX_STARTING;
if (box->flags & TRANSBOX_WANTED)
{
box->flags &= ~TRANSBOX_WANTED;
condition_broadcast (&box->wakeup);
}
if (err)
return err;
if (! MACH_PORT_VALID (control))
/* The start translator succeeded, but it returned a bogus port. */
return EDIED;
box->active = control;
}
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,
user->uids->ids, user->uids->num,
user->gids->ids, user->gids->num,
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, 0);
mach_port_deallocate (mach_task_self (), control);
if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
goto start_over;
return err;
}
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