/* $OpenBSD: bufaux.c,v 1.60 2014/04/30 05:29:56 djm Exp $ */
/*
 * Copyright (c) 2012 Damien Miller <djm@mindrot.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* Emulation wrappers for legacy OpenSSH buffer API atop sshbuf */

#include "includes.h"

#include <sys/types.h>

#include "buffer.h"
#include "log.h"
#include "ssherr.h"

int
buffer_get_short_ret(u_short *v, Buffer *buffer)
{
	int ret;

	if ((ret = sshbuf_get_u16(buffer, v)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return -1;
	}
	return 0;
}

u_short
buffer_get_short(Buffer *buffer)
{
	u_short ret;

	if (buffer_get_short_ret(&ret, buffer) == -1)
		fatal("%s: buffer error", __func__);

	return (ret);
}

int
buffer_get_int_ret(u_int *v, Buffer *buffer)
{
	int ret;

	if ((ret = sshbuf_get_u32(buffer, v)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return -1;
	}
	return 0;
}

u_int
buffer_get_int(Buffer *buffer)
{
	u_int ret;

	if (buffer_get_int_ret(&ret, buffer) == -1)
		fatal("%s: buffer error", __func__);

	return (ret);
}

int
buffer_get_int64_ret(u_int64_t *v, Buffer *buffer)
{
	int ret;

	if ((ret = sshbuf_get_u64(buffer, v)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return -1;
	}
	return 0;
}

u_int64_t
buffer_get_int64(Buffer *buffer)
{
	u_int64_t ret;

	if (buffer_get_int64_ret(&ret, buffer) == -1)
		fatal("%s: buffer error", __func__);

	return (ret);
}

void
buffer_put_short(Buffer *buffer, u_short value)
{
	int ret;

	if ((ret = sshbuf_put_u16(buffer, value)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}

void
buffer_put_int(Buffer *buffer, u_int value)
{
	int ret;

	if ((ret = sshbuf_put_u32(buffer, value)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}

void
buffer_put_int64(Buffer *buffer, u_int64_t value)
{
	int ret;

	if ((ret = sshbuf_put_u64(buffer, value)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}

void *
buffer_get_string_ret(Buffer *buffer, u_int *length_ptr)
{
	size_t len;
	int ret;
	u_char *value;

	if ((ret = sshbuf_get_string(buffer, &value, &len)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return NULL;
	}
	if (length_ptr != NULL)
		*length_ptr = len;  /* Safe: sshbuf never stores len > 2^31 */
	return value;
}

void *
buffer_get_string(Buffer *buffer, u_int *length_ptr)
{
	void *ret;

	if ((ret = buffer_get_string_ret(buffer, length_ptr)) == NULL)
		fatal("%s: buffer error", __func__);
	return (ret);
}

char *
buffer_get_cstring_ret(Buffer *buffer, u_int *length_ptr)
{
	size_t len;
	int ret;
	char *value;

	if ((ret = sshbuf_get_cstring(buffer, &value, &len)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return NULL;
	}
	if (length_ptr != NULL)
		*length_ptr = len;  /* Safe: sshbuf never stores len > 2^31 */
	return value;
}

char *
buffer_get_cstring(Buffer *buffer, u_int *length_ptr)
{
	char *ret;

	if ((ret = buffer_get_cstring_ret(buffer, length_ptr)) == NULL)
		fatal("%s: buffer error", __func__);
	return ret;
}

const void *
buffer_get_string_ptr_ret(Buffer *buffer, u_int *length_ptr)
{
	size_t len;
	int ret;
	const u_char *value;

	if ((ret = sshbuf_get_string_direct(buffer, &value, &len)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return NULL;
	}
	if (length_ptr != NULL)
		*length_ptr = len;  /* Safe: sshbuf never stores len > 2^31 */
	return value;
}

const void *
buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr)
{
	const void *ret;

	if ((ret = buffer_get_string_ptr_ret(buffer, length_ptr)) == NULL)
		fatal("%s: buffer error", __func__);
	return (ret);
}

void
buffer_put_string(Buffer *buffer, const void *buf, u_int len)
{
	int ret;

	if ((ret = sshbuf_put_string(buffer, buf, len)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}

void
buffer_put_cstring(Buffer *buffer, const char *s)
{
	int ret;

	if ((ret = sshbuf_put_cstring(buffer, s)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}

int
buffer_get_char_ret(char *v, Buffer *buffer)
{
	int ret;

	if ((ret = sshbuf_get_u8(buffer, (u_char *)v)) != 0) {
		ssh_error("%s: %s", __func__, ssh_err(ret));
		return -1;
	}
	return 0;
}

int
buffer_get_char(Buffer *buffer)
{
	char ch;

	if (buffer_get_char_ret(&ch, buffer) == -1)
		fatal("%s: buffer error", __func__);
	return (u_char) ch;
}

void
buffer_put_char(Buffer *buffer, int value)
{
	int ret;

	if ((ret = sshbuf_put_u8(buffer, value)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}

void
buffer_put_bignum2_from_string(Buffer *buffer, const u_char *s, u_int l)
{
	int ret;

	if ((ret = sshbuf_put_bignum2_bytes(buffer, s, l)) != 0)
		fatal("%s: %s", __func__, ssh_err(ret));
}