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2da24fa6e9
PR: 9982 Adviced by: des Reviewed by: -alpha and -net (no objection) Obtained from: OpenBSD
198 lines
5.8 KiB
C
198 lines
5.8 KiB
C
/*
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* ++Copyright++ 1983, 1990, 1993
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* -
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* Copyright (c) 1983, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* -
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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* -
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* --Copyright--
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
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static char rcsid[] = "$FreeBSD$";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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/*
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* ASCII internet address interpretation routine.
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* The value returned is in network order.
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*/
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in_addr_t /* XXX should be struct in_addr :( */
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inet_addr(cp)
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register const char *cp;
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{
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struct in_addr val;
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if (inet_aton(cp, &val))
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return (val.s_addr);
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return (INADDR_NONE);
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}
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/*
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* Check whether "cp" is a valid ASCII representation
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* of an Internet address and convert to a binary address.
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* Returns 1 if the address is valid, 0 if not.
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* This replaces inet_addr, the return value from which
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* cannot distinguish between failure and a local broadcast address.
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*/
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int
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inet_aton(cp, addr)
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register const char *cp;
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struct in_addr *addr;
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{
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u_long parts[4];
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in_addr_t val;
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char *c;
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char *endptr;
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int gotend, n;
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c = (char *)cp;
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n = 0;
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/*
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* Run through the string, grabbing numbers until
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* the end of the string, or some error
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*/
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gotend = 0;
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while (!gotend) {
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errno = 0;
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val = strtoul(c, &endptr, 0);
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if (errno == ERANGE) /* Fail completely if it overflowed. */
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return (0);
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/*
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* If the whole string is invalid, endptr will equal
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* c.. this way we can make sure someone hasn't
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* gone '.12' or something which would get past
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* the next check.
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*/
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if (endptr == c)
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return (0);
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parts[n] = val;
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c = endptr;
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/* Check the next character past the previous number's end */
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switch (*c) {
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case '.' :
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/* Make sure we only do 3 dots .. */
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if (n == 3) /* Whoops. Quit. */
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return (0);
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n++;
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c++;
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break;
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case '\0':
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gotend = 1;
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break;
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default:
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if (isspace((unsigned char)*c)) {
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gotend = 1;
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break;
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} else
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return (0); /* Invalid character, so fail */
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}
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}
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/*
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* Concoct the address according to
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* the number of parts specified.
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*/
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switch (n) {
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case 0: /* a -- 32 bits */
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/*
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* Nothing is necessary here. Overflow checking was
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* already done in strtoul().
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*/
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break;
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case 1: /* a.b -- 8.24 bits */
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if (val > 0xffffff || parts[0] > 0xff)
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return (0);
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val |= parts[0] << 24;
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break;
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case 2: /* a.b.c -- 8.8.16 bits */
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if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16);
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break;
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case 3: /* a.b.c.d -- 8.8.8.8 bits */
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if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
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parts[2] > 0xff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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break;
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}
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if (addr != NULL)
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addr->s_addr = htonl(val);
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return (1);
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}
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/*
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* Weak aliases for applications that use certain private entry points,
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* and fail to include <arpa/inet.h>.
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*/
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#undef inet_addr
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__weak_reference(__inet_addr, inet_addr);
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#undef inet_aton
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__weak_reference(__inet_aton, inet_aton);
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