/*	$OpenBSD: ccitt_addr.c,v 1.9 2005/02/18 04:00:21 jaredy Exp $	*/
/*	$NetBSD: ccitt_addr.c,v 1.8 1995/04/23 10:33:41 cgd Exp $	*/

/*
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)ccitt_addr.c	8.1 (Berkeley) 6/5/93
 */

/*
 * parse CCITT addresses
 *
 * Addresses must have the format: [hpr],x121address[,userdata][,protocol]
 * items enclosed with square brackets are optional
 * 'h' or 'p' means hi priority (packet size = 128; specific to Datapac
 * and necessary only for X.25(76) and non-negotiating X.25(80) DTE's)
 * 'r' means reverse charge (remote DTE pays for call).
 * The x121address consists of an optional netid and dot, followed
 * by a dte address.
 *
 * Frank Pronk
 * The University of British Columbia
 * Laboratory for Computational Vision
 * Copyright (c) 1984
 */

#include <sys/types.h>
#include <sys/socket.h>

#include <netccitt/x25.h>

#include <stdlib.h>
#include <string.h>

static char *copychar(char *, char *);

int
ccitt_addr(char *addr, struct sockaddr_x25 *xp)
{
	char *p, *ap, *limit;
	int havenet = 0;

	memset(xp, 0, sizeof(*xp));
	xp->x25_family = AF_CCITT;
	xp->x25_len = sizeof(*xp);
	p = addr;

	/*
	 * process optional priority and reverse charging flags
	 */

	if (*p == 'p' || *p == 'r' || *p == 'h') {
		while (*p == 'p' || *p == 'r' || *p == 'h') {
			if (*p == 'p' || *p == 'h')
				xp->x25_opts.op_psize = X25_PS128;
			else if (*p == 'r')
				xp->x25_opts.op_flags |= X25_REVERSE_CHARGE;
			p++;
		}
		if (*p != ',')
			return (0);
		p++;
	}
	if (*p == '\0')
		return (0);

	/*
	 * [network id:]X.121 address
	 */

	ap = xp->x25_addr;
	limit = ap + sizeof(xp->x25_addr) - 1;
	while (*p) {
		if (*p == ',')
			break;
		if (*p == '.' || *p == ':') {
			if (havenet)
				return (0);
			havenet++;
			xp->x25_net = atoi(xp->x25_addr);
			p++;
			ap = xp->x25_addr;
			*ap = '\0';
		}
		if (*p < '0' || *p > '9')
			return (0);
		if (ap >= limit)
			return (0);
		*ap++ = *p++;
	}
	if (*p == '\0')
		return (1);

	/*
	 * optional user data, bytes 4 to 16
	 */

	p++;
	ap = xp->x25_udata + 4;		/* first four bytes are protocol id */
	limit = ap + sizeof(xp->x25_udata) - 4;
	xp->x25_udlen = 4;
	while (*p) {
		if (*p == ',')
			break;
		if (ap >= limit)
			return (0);
		p = copychar(p, ap++);
		xp->x25_udlen++;
	}
	if (xp->x25_udlen == 4)
		xp->x25_udlen = 0;
	if (*p == '\0')
		return (1);

	p++;
	ap = xp->x25_udata;		/* protocol id */
	limit = ap + (xp->x25_udlen ? 4 : sizeof(xp->x25_udata));
	while (*p) {
		if (*p == ',')
			return (0);
		if (ap >= limit)
			return (0);
		p = copychar(p, ap++);
	}
	if (xp->x25_udlen == 0)
		xp->x25_udlen = ap - xp->x25_udata;
	return (1);
}

static char *
copychar(char *from, char *to)
{
	int n;

	if (*from != '\\' || from[1] < '0' || from[1] > '7') {
		*to = *from++;
		return (from);
	}
	n = *++from - '0';
	from++;
	if (*from >= '0' && *from <= '7') {
		int n1;

		n = n*8 + *from++ - '0';
		if (*from >= '0' && *from <= '7' && (n1 = n*8 + *from-'0') < 256) {
			n = n1;
			from++;
		}
	}
	*to = n;
	return (from);
}