Provided implementations of inet_net_pton and inet_pton from BIND for systems...

  Changelog for the c-ares project

* April 5

- Dominick Meglio: Provided implementations of inet_net_pton and inet_pton

  from BIND for systems that do not include these functions.

* March 11, 2005

- Dominick Meglio added ares_parse_aaaa_reply.c and did various

ares_strerror.c ares_cancel.c ares_init.c ares_timeout.c ares_destroy.c	   \

ares_mkquery.c ares_version.c ares_expand_name.c ares_parse_a_reply.c	   \

windows_port.c ares_expand_string.c ares_parse_ptr_reply.c                 \

ares_parse_aaaa_reply.c

ares_parse_aaaa_reply.c inet_net_pton.c

HHEADERS = ares.h ares_private.h setup.h ares_dns.h ares_version.h nameser.h

     AC_DEFINE_UNQUOTED(HAVE_STRUCT_IN6_ADDR,1,[Define to 1 if you have struct in6_addr.])

)

dnl check for inet_pton

AC_CHECK_FUNCS(inet_pton)

dnl Some systems have it, but not IPv6

if test "$ac_cv_func_inet_pton" = "yes" ; then

AC_MSG_CHECKING(if inet_pton supports IPv6)

AC_TRY_RUN(

  [

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>

#endif

#ifdef HAVE_WINSOCK_H

#include <winsock.h>

#endif

#ifdef HAVE_NETINET_IN_H

#include <netinet/in.h>

#endif

int main()

  {

    struct in6_addr addr6;

    if (inet_pton(AF_INET6, "::1", &addr6) < 1)

      exit(1);

    else

      exit(0);

  }

  ], [

       AC_MSG_RESULT(yes)

       AC_DEFINE_UNQUOTED(HAVE_INET_PTON_IPV6,1,[Define to 1 if inet_pton supports IPv6.])

     ], AC_MSG_RESULT(no),AC_MSG_RESULT(no))

fi

dnl Check for inet_net_pton

AC_CHECK_FUNCS(inet_net_pton)

dnl Again, some systems have it, but not IPv6

if test "$ac_cv_func_inet_net_pton" = "yes" ; then

AC_MSG_CHECKING(if inet_net_pton supports IPv6)

AC_TRY_RUN(

  [

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>

#endif

#ifdef HAVE_WINSOCK_H

#include <winsock.h>

#endif

#ifdef HAVE_NETINET_IN_H

#include <netinet/in.h>

#endif

int main()

  {

    struct in6_addr addr6;

    if (inet_net_pton(AF_INET6, "::1", &addr6, sizeof(addr6)) < 1)

      exit(1);

    else

      exit(0);

  }

  ], [

       AC_MSG_RESULT(yes)

       AC_DEFINE_UNQUOTED(HAVE_INET_NET_PTON_IPV6,1,[Define to 1 if inet_net_pton supports IPv6.])

     ], AC_MSG_RESULT(no),AC_MSG_RESULT(no))

fi

AC_OUTPUT(Makefile)

/*

 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

 * 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.

 */

#include "setup.h"

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/nameser.h>

#include <arpa/inet.h>

#include <ctype.h>

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#if !defined(HAVE_INET_NET_PTON) || !defined(HAVE_INET_NET_PTON_IPV6) || \

    !defined(HAVE_INET_PTON) || !defined(HAVE_INET_PTON_IPV6)

/*

 * 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";

	static const char digits[] = "0123456789";

	int n, ch, tmp = 0, dirty, bits;

	const u_char *odst = dst;

	ch = *src++;

	if (ch == '0' && (src[0] == 'x' || src[0] == 'X')

	    && isascii((unsigned char)(src[1]))

	    && isxdigit((unsigned char)(src[1]))) {

		/* Hexadecimal: Eat nybble string. */

		if (size <= 0U)

			goto emsgsize;

		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;

			if (dirty == 0)

				tmp = n;

			else

				tmp = (tmp << 4) | n;

			if (++dirty == 2) {

				if (size-- <= 0U)

					goto emsgsize;

				*dst++ = (u_char) tmp;

				dirty = 0;

			}

		}

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

			if (size-- <= 0U)

				goto emsgsize;

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

		}

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

		/* Decimal: eat dotted digit string. */

		for (;;) {

			tmp = 0;

			do {

				n = strchr(digits, ch) - digits;

				tmp *= 10;

				tmp += n;

				if (tmp > 255)

					goto enoent;

			} while ((ch = *src++) != '\0' &&

				 isascii(ch) && isdigit(ch));

			if (size-- <= 0U)

				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((unsigned char)(src[0])) &&

	    isdigit((unsigned char)(src[0])) && dst > odst) {

		/* CIDR width specifier.  Nothing can follow it. */

		ch = *src++;	/* Skip over the /. */

		bits = 0;

		do {

			n = strchr(digits, ch) - digits;

			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 = 8;

		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 < ((dst - odst) * 8))

			bits = (dst - odst) * 8;

		/*

		 * If there are no additional bits specified for a class D

		 * address adjust bits to 4.

		 */

		if (bits == 8 && *odst == 224)

			bits = 4;

	}

	/* Extend network to cover the actual mask. */

	while (bits > ((dst - odst) * 8)) {

		if (size-- <= 0U)

			goto emsgsize;

		*dst++ = '\0';

	}

	return (bits);

 enoent:

	errno = ENOENT;

	return (-1);

 emsgsize:

	errno = EMSGSIZE;

	return (-1);

}

static int

getbits(const char *src, int *bitsp) {

	static const char digits[] = "0123456789";

	int n;

	int val;

	char ch;

	val = 0;

	n = 0;

	while ((ch = *src++) != '\0') {

		const char *pch;

		pch = strchr(digits, ch);

		if (pch != NULL) {

			if (n++ != 0 && val == 0)	/* no leading zeros */

				return (0);

			val *= 10;

			val += (pch - digits);

			if (val > 128)			/* range */

				return (0);

			continue;

		}

		return (0);

	}

	if (n == 0)

		return (0);

	*bitsp = val;

	return (1);

}

static int

getv4(const char *src, u_char *dst, int *bitsp) {

	static const char digits[] = "0123456789";

	u_char *odst = dst;

	int n;

	u_int val;

	char ch;

	val = 0;

	n = 0;

	while ((ch = *src++) != '\0') {

		const char *pch;

		pch = strchr(digits, ch);

		if (pch != NULL) {

			if (n++ != 0 && val == 0)	/* no leading zeros */

				return (0);

			val *= 10;

			val += (pch - digits);

			if (val > 255)			/* range */

				return (0);

			continue;

		}

		if (ch == '.' || ch == '/') {

			if (dst - odst > 3)		/* too many octets? */

				return (0);

			*dst++ = val;

			if (ch == '/')

				return (getbits(src, bitsp));

			val = 0;

			n = 0;

			continue;

		}

		return (0);

	}

	if (n == 0)

		return (0);

	if (dst - odst > 3)		/* too many octets? */

		return (0);

	*dst++ = val;

	return (1);

}

static int

inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) {

	static const char xdigits_l[] = "0123456789abcdef",

			  xdigits_u[] = "0123456789ABCDEF";

	u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;

	const char *xdigits, *curtok;

	int ch, saw_xdigit;

	u_int val;

	int digits;

	int bits;

	size_t bytes;

	int words;

	int ipv4;

	memset((tp = tmp), '\0', NS_IN6ADDRSZ);

	endp = tp + NS_IN6ADDRSZ;

	colonp = NULL;

	/* Leading :: requires some special handling. */

	if (*src == ':')

		if (*++src != ':')

			goto enoent;

	curtok = src;

	saw_xdigit = 0;

	val = 0;

	digits = 0;

	bits = -1;

	ipv4 = 0;

	while ((ch = *src++) != '\0') {

		const char *pch;

		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)

			pch = strchr((xdigits = xdigits_u), ch);

		if (pch != NULL) {

			val <<= 4;

			val |= (pch - xdigits);

			if (++digits > 4)

				goto enoent;

			saw_xdigit = 1;

			continue;

		}

		if (ch == ':') {

			curtok = src;

			if (!saw_xdigit) {

				if (colonp)

					goto enoent;

				colonp = tp;

				continue;

			} else if (*src == '\0')

				goto enoent;

			if (tp + NS_INT16SZ > endp)

				return (0);

			*tp++ = (u_char) (val >> 8) & 0xff;

			*tp++ = (u_char) val & 0xff;

			saw_xdigit = 0;

			digits = 0;

			val = 0;

			continue;

		}

		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&

		     getv4(curtok, tp, &bits) > 0) {

			tp += NS_INADDRSZ;

			saw_xdigit = 0;

			ipv4 = 1;

			break;	/* '\0' was seen by inet_pton4(). */

		}

		if (ch == '/' && getbits(src, &bits) > 0)

			break;

		goto enoent;

	}

	if (saw_xdigit) {

		if (tp + NS_INT16SZ > endp)

			goto enoent;

		*tp++ = (u_char) (val >> 8) & 0xff;

		*tp++ = (u_char) val & 0xff;

	}

	if (bits == -1)

		bits = 128;

	words = (bits + 15) / 16;

	if (words < 2)

		words = 2;

	if (ipv4)

		words = 8;

	endp =  tmp + 2 * words;

	if (colonp != NULL) {

		/*

		 * Since some memmove()'s erroneously fail to handle

		 * overlapping regions, we'll do the shift by hand.

		 */

		const int n = tp - colonp;

		int i;

		if (tp == endp)

			goto enoent;

		for (i = 1; i <= n; i++) {

			endp[- i] = colonp[n - i];

			colonp[n - i] = 0;

		}

		tp = endp;

	}

	if (tp != endp)

		goto enoent;

	bytes = (bits + 7) / 8;

	if (bytes > size)

		goto emsgsize;

	memcpy(dst, tmp, bytes);

	return (bits);

 enoent:

	errno = ENOENT;

	return (-1);

 emsgsize:

	errno = EMSGSIZE;

	return (-1);

}

/*

 * 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

ares_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));

	case AF_INET6:

		return (inet_net_pton_ipv6(src, dst, size));

	default:

		errno = EAFNOSUPPORT;

		return (-1);

	}

}

#endif

#if !defined(HAVE_INET_PTON) || !defined(HAVE_INET_PTON_IPV6)

int ares_inet_pton(int af, const char *src, void *dst) {

	int size, result;

	if (af == AF_INET)

		size = sizeof(struct in_addr);

	else if (af == AF_INET6)

		size = sizeof(struct in6_addr);

	else

	{

		errno = EAFNOSUPPORT;

		return -1;

	}

	result = ares_inet_net_pton(af, src, dst, size);

	if (result == -1 && errno == ENOENT)

		return 0;

	return (result > -1 ? 1 : -1);

}

#endif

};

#endif

#if defined(HAVE_INET_PTON) && defined(HAVE_INET_PTON_IPV6)

#define ares_inet_pton(x,y,z) inet_pton(x,y,z)

#else

int ares_inet_pton(int af, const char *src, void *dst);

#endif

#if defined(HAVE_INET_NET_PTON) && defined(HAVE_INET_NET_PTON_IPV6)

#define ares_inet_net_pton(w,x,y,z) inet_net_pton(w,x,y,z)

#else

int ares_inet_net_pton(int af, const char *src, void *dst, unsigned int size);

#endif

#endif /* ARES_SETUP_H */