NetBSD-5.0.2/common/lib/libprop/prop_kern.c
/* $NetBSD: prop_kern.c,v 1.9 2008/04/28 20:22:53 martin Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(__NetBSD__)
#include <sys/types.h>
#include <sys/ioctl.h>
#include <prop/proplib.h>
#if !defined(_KERNEL) && !defined(_STANDALONE)
#include <sys/mman.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
static int
_prop_object_pack_pref(prop_object_t obj, struct plistref *pref, char **bufp)
{
char *buf;
switch (prop_object_type(obj)) {
case PROP_TYPE_DICTIONARY:
buf = prop_dictionary_externalize(obj);
break;
case PROP_TYPE_ARRAY:
buf = prop_array_externalize(obj);
break;
default:
return (ENOTSUP);
}
if (buf == NULL) {
/* Assume we ran out of memory. */
return (ENOMEM);
}
pref->pref_plist = buf;
pref->pref_len = strlen(buf) + 1;
*bufp = buf;
return (0);
}
static int
_prop_object_send_ioctl(prop_object_t obj, int fd, unsigned long cmd)
{
struct plistref pref;
char *buf;
int error;
error = _prop_object_pack_pref(obj, &pref, &buf);
if (error)
return (error);
if (ioctl(fd, cmd, &pref) == -1)
error = errno;
else
error = 0;
free(buf);
return (error);
}
/*
* prop_array_send_ioctl --
* Send an array to the kernel using the specified ioctl.
*/
int
prop_array_send_ioctl(prop_array_t array, int fd, unsigned long cmd)
{
return (_prop_object_send_ioctl(array, fd, cmd));
}
/*
* prop_dictionary_send_ioctl --
* Send a dictionary to the kernel using the specified ioctl.
*/
int
prop_dictionary_send_ioctl(prop_dictionary_t dict, int fd, unsigned long cmd)
{
return (_prop_object_send_ioctl(dict, fd, cmd));
}
static int
_prop_object_unpack_pref(const struct plistref *pref, prop_type_t type,
prop_object_t *objp)
{
prop_object_t obj = NULL;
char *buf;
int error = 0;
if (pref->pref_len == 0) {
/*
* This should never happen; we should always get the XML
* for an empty dictionary if it's really empty.
*/
error = EIO;
goto out;
} else {
buf = pref->pref_plist;
buf[pref->pref_len - 1] = '\0'; /* extra insurance */
switch (type) {
case PROP_TYPE_DICTIONARY:
obj = prop_dictionary_internalize(buf);
break;
case PROP_TYPE_ARRAY:
obj = prop_array_internalize(buf);
break;
default:
error = ENOTSUP;
}
(void) munmap(buf, pref->pref_len);
if (obj == NULL && error == 0)
error = EIO;
}
out:
if (error == 0)
*objp = obj;
return (error);
}
/*
* prop_array_recv_ioctl --
* Receive an array from the kernel using the specified ioctl.
*/
int
prop_array_recv_ioctl(int fd, unsigned long cmd, prop_array_t *arrayp)
{
struct plistref pref;
if (ioctl(fd, cmd, &pref) == -1)
return (errno);
return (_prop_object_unpack_pref(&pref, PROP_TYPE_ARRAY,
(prop_object_t *)arrayp));
}
/*
* prop_dictionary_recv_ioctl --
* Receive a dictionary from the kernel using the specified ioctl.
*/
int
prop_dictionary_recv_ioctl(int fd, unsigned long cmd, prop_dictionary_t *dictp)
{
struct plistref pref;
if (ioctl(fd, cmd, &pref) == -1)
return (errno);
return (_prop_object_unpack_pref(&pref, PROP_TYPE_DICTIONARY,
(prop_object_t *)dictp));
}
/*
* prop_dictionary_sendrecv_ioctl --
* Combination send/receive a dictionary to/from the kernel using
* the specified ioctl.
*/
int
prop_dictionary_sendrecv_ioctl(prop_dictionary_t dict, int fd,
unsigned long cmd, prop_dictionary_t *dictp)
{
struct plistref pref;
char *buf;
int error;
error = _prop_object_pack_pref(dict, &pref, &buf);
if (error)
return (error);
if (ioctl(fd, cmd, &pref) == -1)
error = errno;
else
error = 0;
free(buf);
if (error)
return (error);
return (_prop_object_unpack_pref(&pref, PROP_TYPE_DICTIONARY,
(prop_object_t *)dictp));
}
#endif /* !_KERNEL && !_STANDALONE */
#if defined(_KERNEL)
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <uvm/uvm.h>
/* Arbitrary limit ioctl input to 64KB */
unsigned int prop_object_copyin_limit = 65536;
static int
_prop_object_copyin_ioctl(const struct plistref *pref, const prop_type_t type,
const u_long cmd, prop_object_t *objp)
{
prop_object_t obj = NULL;
char *buf;
int error;
if ((cmd & IOC_IN) == 0)
return (EFAULT);
/*
* Allocate an extra byte so we can guarantee NUL-termination.
*
* Allow malloc to fail in case pmap would be exhausted.
*/
buf = malloc(pref->pref_len + 1, M_TEMP, M_WAITOK | M_CANFAIL);
if (buf == NULL)
return (ENOMEM);
error = copyin(pref->pref_plist, buf, pref->pref_len);
if (error) {
free(buf, M_TEMP);
return (error);
}
buf[pref->pref_len] = '\0';
switch (type) {
case PROP_TYPE_ARRAY:
obj = prop_array_internalize(buf);
break;
case PROP_TYPE_DICTIONARY:
obj = prop_dictionary_internalize(buf);
break;
default:
error = ENOTSUP;
}
free(buf, M_TEMP);
if (obj == NULL) {
if (error == 0)
error = EIO;
} else {
*objp = obj;
}
return (error);
}
/*
* prop_array_copyin_ioctl --
* Copy in an array send with an ioctl.
*/
int
prop_array_copyin_ioctl(const struct plistref *pref, const u_long cmd,
prop_array_t *arrayp)
{
return (_prop_object_copyin_ioctl(pref, PROP_TYPE_ARRAY,
cmd, (prop_object_t *)arrayp));
}
/*
* prop_dictionary_copyin_ioctl --
* Copy in a dictionary sent with an ioctl.
*/
int
prop_dictionary_copyin_ioctl(const struct plistref *pref, const u_long cmd,
prop_dictionary_t *dictp)
{
return (_prop_object_copyin_ioctl(pref, PROP_TYPE_DICTIONARY,
cmd, (prop_object_t *)dictp));
}
static int
_prop_object_copyout_ioctl(struct plistref *pref, const u_long cmd,
prop_object_t obj)
{
struct lwp *l = curlwp; /* XXX */
struct proc *p = l->l_proc;
char *buf;
size_t len, rlen;
int error = 0;
vaddr_t uaddr;
if ((cmd & IOC_OUT) == 0)
return (EFAULT);
switch (prop_object_type(obj)) {
case PROP_TYPE_ARRAY:
buf = prop_array_externalize(obj);
break;
case PROP_TYPE_DICTIONARY:
buf = prop_dictionary_externalize(obj);
break;
default:
return (ENOTSUP);
}
if (buf == NULL)
return (ENOMEM);
len = strlen(buf) + 1;
rlen = round_page(len);
/*
* See sys_mmap() in sys/uvm/uvm_mmap.c.
* Let's act as if we were calling mmap(0, ...)
*/
uaddr = p->p_emul->e_vm_default_addr(p,
(vaddr_t)p->p_vmspace->vm_daddr, rlen);
error = uvm_mmap(&p->p_vmspace->vm_map,
&uaddr, rlen,
VM_PROT_READ|VM_PROT_WRITE,
VM_PROT_READ|VM_PROT_WRITE,
MAP_PRIVATE|MAP_ANON,
NULL, 0,
p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur);
if (error == 0) {
error = copyout(buf, (char *)uaddr, len);
if (error == 0) {
pref->pref_plist = (char *)uaddr;
pref->pref_len = len;
}
}
free(buf, M_TEMP);
return (error);
}
/*
* prop_array_copyout_ioctl --
* Copy out an array being received with an ioctl.
*/
int
prop_array_copyout_ioctl(struct plistref *pref, const u_long cmd,
prop_array_t array)
{
return (_prop_object_copyout_ioctl(pref, cmd, array));
}
/*
* prop_dictionary_copyout_ioctl --
* Copy out a dictionary being received with an ioctl.
*/
int
prop_dictionary_copyout_ioctl(struct plistref *pref, const u_long cmd,
prop_dictionary_t dict)
{
return (_prop_object_copyout_ioctl(pref, cmd, dict));
}
#endif /* _KERNEL */
#endif /* __NetBSD__ */