StdLib/BsdSocketLib/inet_net_pton.c

/*
 * Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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.
 */

/*
 * Portions copyright (c) 1999, 2000
 * Intel Corporation.
 * 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 Intel Corporation and
 *    its contributors.
 *
 * 4. Neither the name of Intel Corporation or its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION 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 INTEL CORPORATION 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.
 *
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char orig_rcsid[] = "From Id: inet_net_pton.c,v 1.8 1996/11/21 10:28:12 vixie Exp $";
static const char rcsid[] = "$Id: inet_net_pton.c,v 1.1.1.1 2003/11/19 01:51:29 kyu3 Exp $";
#endif

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

static int  inet_net_pton_ipv4 (const char *src, u_char *dst,
                    size_t size);

/*
 * static int
 * inet_net_pton(af, src, dst, size)
 *  convert network number from presentation to network format.
 *  accepts hex octets, hex strings, decimal octets, and /CIDR.
 *  "size" is in bytes and describes "dst".
 * return:
 *  number of bits, either imputed classfully or specified with /CIDR,
 *  or -1 if some failure occurred (check errno).  ENOENT means it was
 *  not a valid network specification.
 * author:
 *  Paul Vixie (ISC), June 1996
 */
int
inet_net_pton(
    int af,
    const char *src,
    void *dst,
    size_t size
    )
{
    switch (af) {
    case AF_INET:
        return (inet_net_pton_ipv4(src, dst, size));
    default:
        errno = EAFNOSUPPORT;
        return (-1);
    }
}

/*
 * static int
 * inet_net_pton_ipv4(src, dst, size)
 *  convert IPv4 network number from presentation to network format.
 *  accepts hex octets, hex strings, decimal octets, and /CIDR.
 *  "size" is in bytes and describes "dst".
 * return:
 *  number of bits, either imputed classfully or specified with /CIDR,
 *  or -1 if some failure occurred (check errno).  ENOENT means it was
 *  not an IPv4 network specification.
 * note:
 *  network byte order assumed.  this means 192.5.5.240/28 has
 *  0x11110000 in its fourth octet.
 * author:
 *  Paul Vixie (ISC), June 1996
 */
static int
inet_net_pton_ipv4(
    const char *src,
    u_char *dst,
    size_t size
    )
{
    static const char xdigits[] = "0123456789abcdef";
    static const char digits[] = "0123456789";
    int n;
  int ch;
  int tmp;
  int dirty;
  int bits;
    const u_char *odst = dst;

    ch = *src++;
    if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
        && isascii(src[1]) && isxdigit(src[1])) {
        /* Hexadecimal: Eat nybble string. */
        if (size <= 0)
            goto emsgsize;
        *dst = 0, dirty = 0;
        src++;  /* skip x or X. */
        while ((ch = *src++) != '\0' &&
               isascii(ch) && isxdigit(ch)) {
            if (isupper(ch))
                ch = tolower(ch);
            n = (int)(strchr(xdigits, ch) - xdigits);
            assert(n >= 0 && n <= 15);
            *dst |= n;
            if (!dirty++)
                *dst <<= 4;
            else if (size-- > 0)
                *++dst = 0, dirty = 0;
            else
                goto emsgsize;
        }
        if (dirty)
            size--;
    } else if (isascii(ch) && isdigit(ch)) {
        /* Decimal: eat dotted digit string. */
        for (;;) {
            tmp = 0;
            do {
                n = (int)(strchr(digits, ch) - digits);
                assert(n >= 0 && n <= 9);
                tmp *= 10;
                tmp += n;
                if (tmp > 255)
                    goto enoent;
            } while ((ch = *src++) != '\0' &&
                 isascii(ch) && isdigit(ch));
            if (size-- <= 0)
                goto emsgsize;
            *dst++ = (u_char) tmp;
            if (ch == '\0' || ch == '/')
                break;
            if (ch != '.')
                goto enoent;
            ch = *src++;
            if (!isascii(ch) || !isdigit(ch))
                goto enoent;
        }
    } else
        goto enoent;

    bits = -1;
    if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
        /* CIDR width specifier.  Nothing can follow it. */
        ch = *src++;    /* Skip over the /. */
        bits = 0;
        do {
            n = (int)(strchr(digits, ch) - digits);
            assert(n >= 0 && n <= 9);
            bits *= 10;
            bits += n;
        } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
        if (ch != '\0')
            goto enoent;
        if (bits > 32)
            goto emsgsize;
    }

    /* Firey death and destruction unless we prefetched EOS. */
    if (ch != '\0')
        goto enoent;

    /* If nothing was written to the destination, we found no address. */
    if (dst == odst)
        goto enoent;
    /* If no CIDR spec was given, infer width from net class. */
    if (bits == -1) {
        if (*odst >= 240)   /* Class E */
            bits = 32;
        else if (*odst >= 224)  /* Class D */
            bits = 4;
        else if (*odst >= 192)  /* Class C */
            bits = 24;
        else if (*odst >= 128)  /* Class B */
            bits = 16;
        else            /* Class A */
            bits = 8;
        /* If imputed mask is narrower than specified octets, widen. */
        if (bits >= 8 && bits < ((dst - odst) * 8))
            bits = (int)(dst - odst) * 8;
    }
    /* Extend network to cover the actual mask. */
    while (bits > ((dst - odst) * 8)) {
        if (size-- <= 0)
            goto emsgsize;
        *dst++ = '\0';
    }
    return (bits);

 enoent:
    errno = ENOENT;
    return (-1);

 emsgsize:
    errno = EMSGSIZE;
    return (-1);
}