/*

 * 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 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.

 */

#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) __THROW;

/*

 * 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:

		__set_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

 *	0b11110000 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";

	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;

		dirty = 0;

		tmp = 0;	/* To calm down gcc.  */

		src++;	/* skip x or X. */

		while (isxdigit((ch = *src++))) {

			ch = _tolower(ch);

			n = (const char *) __rawmemchr(xdigits, ch) - xdigits;

			assert(n >= 0 && n <= 15);

			if (dirty == 0)

				tmp = n;

			else

				tmp = (tmp << 4) | n;

			if (++dirty == 2) {

				if (size-- <= 0)

					goto emsgsize;

				*dst++ = (u_char) tmp;

				dirty = 0;

			}

		}

		if (dirty) {  /* Odd trailing nybble? */

			if (size-- <= 0)

				goto emsgsize;

			*dst++ = (u_char) (tmp << 4);

		}

	} else if (isascii(ch) && isdigit(ch)) {

		/* Decimal: eat dotted digit string. */

		for (;;) {

			tmp = 0;

			do {

				n = ((const char *) __rawmemchr(xdigits, ch)

				     - xdigits);

				assert(n >= 0 && n <= 9);

				tmp *= 10;

				tmp += n;

				if (tmp > 255)

					goto enoent;

			} while (isascii((ch = *src++)) && 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 = (const char *) __rawmemchr(xdigits, ch) - xdigits;

			assert(n >= 0 && n <= 9);

			bits *= 10;

			bits += n;

		} while (isascii((ch = *src++)) && 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:

	__set_errno (ENOENT);

	return (-1);

 emsgsize:

	__set_errno (EMSGSIZE);

	return (-1);

}