/*      $NetBSD: prop_kern.c,v 1.7 2006/11/28 18:36:26 cube 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the NetBSD
*      Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* 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>

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.
        * XXX Some sanity check on the size?
        */
       buf = malloc(pref->pref_len + 1, M_TEMP, M_WAITOK);
       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__ */

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