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/*

 * 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.

 */

#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 1.2 2001-09-27 12:01:53 chris 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 __P((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(af, src, dst, size)

        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(src, dst, size)

        const char *src;

        u_char *dst;

        size_t size;

{

        static const char

                xdigits[] = "0123456789abcdef",

                digits[] = "0123456789";

        int n, ch, tmp, dirty, 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 = 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 = 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 = 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 = (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);

}