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/*
Copyright (C) 1993, 1994 Free Software Foundation
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 the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Michael I. Bushnell. */
#include "priv.h"
#include "fsys_S.h"
#include "fsys_reply_U.h"
#include <assert.h>
#include <fcntl.h>
#include <string.h>
struct pending_open
{
struct trivfs_protid *cred;
mach_port_t reply_port;
mach_msg_type_name_t reply_port_type;
struct pending_open *next;
};
kern_return_t
trivfs_S_fsys_getroot (struct trivfs_control *cntl,
mach_port_t reply_port,
mach_msg_type_name_t reply_port_type,
mach_port_t dotdot,
uid_t *uids, u_int nuids,
uid_t *gids, u_int ngids,
int flags,
retry_type *do_retry,
char *retry_name,
mach_port_t *newpt,
mach_msg_type_name_t *newpttype)
{
struct trivfs_protid *cred;
mach_port_t new_realnode;
error_t err = 0;
int perms;
int i;
if (!cntl)
return EOPNOTSUPP;
if ((flags & (O_READ|O_WRITE|O_EXEC) & trivfs_allow_open)
!= (flags & (O_READ|O_WRITE|O_EXEC)))
return EOPNOTSUPP;
/* O_CREAT and O_EXCL are not meaningful here; O_NOLINK and O_NOTRANS
will only be useful when trivfs supports translators (which it doesn't
now). */
flags &= O_HURD;
flags &= ~(O_CREAT|O_EXCL|O_NOLINK|O_NOTRANS);
io_restrict_auth (cntl->underlying, &new_realnode,
uids, nuids, gids, ngids);
file_check_access (new_realnode, &perms);
if ((flags & (O_READ|O_WRITE|O_EXEC) & perms)
!= (flags & (O_READ|O_WRITE|O_EXEC)))
{
mach_port_deallocate (mach_task_self (), new_realnode);
return EACCES;
}
if (trivfs_check_open_hook)
{
err = (*trivfs_check_open_hook) (cntl, uids, nuids, gids, ngids, flags);
assert (err != EWOULDBLOCK);
if (err && (err != EWOULDBLOCK
|| (err == EWOULDBLOCK && (flags & O_NONBLOCK))))
{
mach_port_deallocate (mach_task_self (), new_realnode);
return err;
}
}
cred = ports_allocate_port (sizeof (struct trivfs_protid),
cntl->protidtypes);
cred->isroot = 0;
for (i = 0; i < nuids; i++)
if (uids[i] == 0)
cred->isroot = 1;
cred->uids = malloc (nuids * sizeof (uid_t));
cred->gids = malloc (ngids * sizeof (uid_t));
bcopy (uids, cred->uids, nuids * sizeof (uid_t));
bcopy (gids, cred->gids, ngids * sizeof (uid_t));
cred->nuids = nuids;
cred->ngids = ngids;
cred->hook = 0;
cred->po = malloc (sizeof (struct trivfs_peropen));
cred->po->refcnt = 1;
cred->po->cntl = cntl;
cred->po->openmodes = (flags & ~O_NONBLOCK);
cred->po->hook = 0;
ports_port_ref (cntl);
if (trivfs_peropen_create_hook)
(*trivfs_peropen_create_hook) (cred->po);
cred->realnode = new_realnode;
if (trivfs_protid_create_hook)
(*trivfs_protid_create_hook) (cred);
if (err == EWOULDBLOCK)
{
/* This open request must block. */
struct pending_open *pendo;
pendo = malloc (sizeof (struct pending_open));
ports_port_ref (cred);
pendo->cred = cred;
pendo->reply_port = reply_port;
pendo->reply_port_type = reply_port_type;
pendo->next = 0;
if (cntl->openstail)
cntl->openstail->next = pendo;
else
cntl->openshead = pendo;
cntl->openstail = pendo;
ports_done_with_port (cntl);
mach_port_deallocate (mach_task_self (), dotdot);
return MIG_NO_REPLY;
}
else
{
*do_retry = FS_RETRY_NONE;
*retry_name = '\0';
*newpt = ports_get_right (cred);
*newpttype = MACH_MSG_TYPE_MAKE_SEND;
mach_port_deallocate (mach_task_self (), dotdot);
return 0;
}
}
void
trivfs_complete_open (struct trivfs_control *cntl,
int multi,
error_t err)
{
struct pending_open *pendo, *nxt;
if (!multi)
{
pendo = cntl->openshead;
cntl->openshead = pendo->next;
if (!cntl->openshead)
cntl->openstail = 0;
if (!err)
fsys_getroot_reply (pendo->reply_port, pendo->reply_port_type, 0,
FS_RETRY_NONE, "", ports_get_right (pendo->cred),
MACH_MSG_TYPE_MAKE_SEND);
else
fsys_getroot_reply (pendo->reply_port, pendo->reply_port_type, err,
FS_RETRY_NONE, "", MACH_PORT_NULL,
MACH_MSG_TYPE_COPY_SEND);
ports_done_with_port (pendo->cred);
free (pendo);
}
else
{
for (pendo = cntl->openshead; pendo; pendo = nxt)
{
if (!err)
fsys_getroot_reply (pendo->reply_port, pendo->reply_port_type, 0,
FS_RETRY_NONE, "",
ports_get_right (pendo->cred),
MACH_MSG_TYPE_MAKE_SEND);
else
fsys_getroot_reply (pendo->reply_port, pendo->reply_port_type, err,
FS_RETRY_NONE, "", MACH_PORT_NULL,
MACH_MSG_TYPE_COPY_SEND);
nxt = pendo->next;
ports_done_with_port (pendo->cred);
free (pendo);
}
cntl->openshead = cntl->openstail = 0;
}
}
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