/*	$NetBSD$	*/

/*-
 * Copyright (c) 2015 Taylor R. Campbell
 * All rights reserved.
 *
 * 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 AUTHOR 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 AUTHOR 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.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD$");

#include "namespace.h"

#include <sys/ioctl_pb.h>

#include <pb.h>

#include <proplib/plistref.h>

int
ioctl_pb_init(int fd, unsigned long cmd, struct pb_msg req,
    struct pb_msg res)
{

	pb_init(res);
	if (ioctl_pb(fd, cmd, req, res) == -1) {
		pb_destroy(res);
		return -1;
	}

	return 0;
}

int
ioctl_pb(int fd, unsigned long cmd, struct pb_msg req, struct pb_msg res)
{
	const size_t nmagic = sizeof(PB_IOCTL_MAGIC);
	struct plistref pref;
	unsigned char *reqbuf = NULL, *resbuf = NULL;
	size_t reqlen, reslen;
	int error;

	error = pb_encoding_size(req, &reqlen);
	if (error)
		goto out;

	if (reqlen > SIZE_MAX - nmagic) {
		error = ENOMEM;
		goto out;
	}
	reqbuf = malloc(nmagic + reqlen);
	if (reqbuf == NULL) {
		error = ENOMEM;
		goto out;
	}

	(void)memcpy(reqbuf, PB_IOCTL_MAGIC, nmagic);
	error = pb_encode_to_memory(req, reqbuf + nmagic, reqlen);
	if (error)
		goto out;

	pref.pref_plist = reqbuf;
	pref.pref_len = nmagic + reqlen;
	if (ioctl(fd, cmd, &pref) == -1) {
		error = errno;
		goto out;
	}
	free(reqbuf);
	reqbuf = NULL;

	resbuf = pref.pref_plist;
	reslen = pref.pref_len;
	error = pb_decode_from_memory(res, resbuf, reslen);
	if (error)
		goto out;
	(void)munmap(resbuf, reslen);
	resbuf = NULL;

out:	if (resbuf)
		(void)munmap(resbuf, reslen);
	if (reqbuf)
		free(reqbuf);
	if (error) {
		errno = error;
		return -1;
	} else {
		return 0;
	}
}