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/*
 * Copyright (c) 2001-2002 Packet Design, LLC.
 * All rights reserved.
 * 
 * Subject to the following obligations and disclaimer of warranty,
 * use and redistribution of this software, in source or object code
 * forms, with or without modifications are expressly permitted by
 * Packet Design; provided, however, that:
 * 
 *    (i)  Any and all reproductions of the source or object code
 *         must include the copyright notice above and the following
 *         disclaimer of warranties; and
 *    (ii) No rights are granted, in any manner or form, to use
 *         Packet Design trademarks, including the mark "PACKET DESIGN"
 *         on advertising, endorsements, or otherwise except as such
 *         appears in the above copyright notice or in the software.
 * 
 * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
 * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
 * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
 * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
 * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
 * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
 * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
 * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
 * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
 * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 PACKET DESIGN IS ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Archie Cobbs <archie@freebsd.org>
 */

#include "ppp/ppp_defs.h"
#include "ppp/ppp_util.h"

#define PATH_RANDOM		"/dev/urandom"

/*
 * Decode ASCII message
 */
void
ppp_util_ascify(char *buf, size_t bsiz, const u_char *data, size_t len)
{
	char *bp = buf;
	int i;

	for (bp = buf, i = 0; i < len; i++) {
		const char ch = (char)data[i];

		if (bsiz < 3)
			break;
		switch (ch) {
		case '\t':
			*bp++ = '\\';
			*bp++ = 't';
			bsiz -= 2;
			break;
		case '\n':
			*bp++ = '\\';
			*bp++ = 'n';
			bsiz -= 2;
			break;
		case '\r':
			*bp++ = '\\';
			*bp++ = 'r';
			bsiz -= 2;
			break;
		default:
			if (isprint(ch & 0x7f)) {
				*bp++ = ch;
				bsiz--;
			} else {
				*bp++ = '^';
				*bp++ = '@' + (ch & 0x1f);
				bsiz -= 2;
			}
			break;
		}
	}
	*bp = '\0';
}

/*
 * Generate random bytes
 */
int
ppp_util_random(void *buf, size_t len)
{
	int rlen;
	int fd;

	if ((fd = open(PATH_RANDOM, O_RDONLY)) == -1)
		return (-1);
	rlen = read(fd, buf, len);
	(void)close(fd);
	if (rlen == -1)
		return (-1);
	if (rlen != len) {
		errno = ENXIO;
		return (-1);
	}
	return (0);
}