/* * Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: * 	This product includes software developed by the University of * 	California, Berkeley and its contributors. * 4. 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. *//* * Portions Copyright (c) 1993 by Digital Equipment Corporation. *  * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. *  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT * CORPORATION 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. *//* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Portions Copyright (c) 1996-1999 by Internet Software Consortium. * * 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 ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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. */#if defined(LIBC_SCCS) && !defined(lint)static const char sccsid[] = "@(#)inet_addr.c	8.1 (Berkeley) 6/17/93";static const char rcsid[] = "$Id: inet_addr.c,v 1.2.206.2 2004/03/17 00:29:45 marka Exp $";#endif /* LIBC_SCCS and not lint */#include "port_before.h"#include <sys/types.h>#include <sys/param.h>#include <netinet/in.h>#include <arpa/inet.h>#include <ctype.h>#include "port_after.h"/* * Ascii internet address interpretation routine. * The value returned is in network order. */u_longinet_addr(const char *cp) {	struct in_addr val;	if (inet_aton(cp, &val))		return (val.s_addr);	return (INADDR_NONE);}/*  * Check whether "cp" is a valid ascii representation * of an Internet address and convert to a binary address. * Returns 1 if the address is valid, 0 if not. * This replaces inet_addr, the return value from which * cannot distinguish between failure and a local broadcast address. */intinet_aton(const char *cp, struct in_addr *addr) {	u_long val;	int base, n;	char c;	u_int8_t parts[4];	u_int8_t *pp = parts;	int digit;	c = *cp;	for (;;) {		/*		 * Collect number up to ``.''.		 * Values are specified as for C:		 * 0x=hex, 0=octal, isdigit=decimal.		 */		if (!isdigit((unsigned char)c))			return (0);		val = 0; base = 10; digit = 0;		if (c == '0') {			c = *++cp;			if (c == 'x' || c == 'X')				base = 16, c = *++cp;			else {				base = 8;				digit = 1 ;			}		}		for (;;) {			if (isascii(c) && isdigit((unsigned char)c)) {				if (base == 8 && (c == '8' || c == '9'))					return (0);				val = (val * base) + (c - '0');				c = *++cp;				digit = 1;			} else if (base == 16 && isascii(c) && 				   isxdigit((unsigned char)c)) {				val = (val << 4) |					(c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));				c = *++cp;				digit = 1;			} else				break;		}		if (c == '.') {			/*			 * Internet format:			 *	a.b.c.d			 *	a.b.c	(with c treated as 16 bits)			 *	a.b	(with b treated as 24 bits)			 */			if (pp >= parts + 3 || val > 0xffU)				return (0);			*pp++ = val;			c = *++cp;		} else			break;	}	/*	 * Check for trailing characters.	 */	if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))		return (0);	/*	 * Did we get a valid digit?	 */	if (!digit)		return (0);	/*	 * Concoct the address according to	 * the number of parts specified.	 */	n = pp - parts + 1;	switch (n) {	case 1:				/* a -- 32 bits */		break;	case 2:				/* a.b -- 8.24 bits */		if (val > 0xffffffU)			return (0);		val |= parts[0] << 24;		break;	case 3:				/* a.b.c -- 8.8.16 bits */		if (val > 0xffffU)			return (0);		val |= (parts[0] << 24) | (parts[1] << 16);		break;	case 4:				/* a.b.c.d -- 8.8.8.8 bits */		if (val > 0xffU)			return (0);		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);		break;	}	if (addr != NULL)		addr->s_addr = htonl(val);	return (1);}