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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 char rcsid[] = "$Id: inet_pton.c,v 1.2 2001-09-27 12:01:53 chris Exp $";

#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <arpa/nameser.h>

#include <string.h>

#include <errno.h>

/*

 * WARNING: Don't even consider trying to compile this on a system where

 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.

 */

static int      inet_pton4 __P((const char *src, u_char *dst));

static int      inet_pton6 __P((const char *src, u_char *dst));

/* int

 * inet_pton(af, src, dst)

 *      convert from presentation format (which usually means ASCII printable)

 *      to network format (which is usually some kind of binary format).

 * return:

 *      1 if the address was valid for the specified address family

 *      0 if the address wasn't valid (`dst' is untouched in this case)

 *      -1 if some other error occurred (`dst' is untouched in this case, too)

 * author:

 *      Paul Vixie, 1996.

 */

int

inet_pton(af, src, dst)

        int af;

        const char *src;

        void *dst;

{

        switch (af) {

        case AF_INET:

                return (inet_pton4(src, dst));

        case AF_INET6:

                return (inet_pton6(src, dst));

        default:

                errno = EAFNOSUPPORT;

                return (-1);

        }

        /* NOTREACHED */

}

/* int

 * inet_pton4(src, dst)

 *      like inet_aton() but without all the hexadecimal and shorthand.

 * return:

 *      1 if `src' is a valid dotted quad, else 0.

 * notice:

 *      does not touch `dst' unless it's returning 1.

 * author:

 *      Paul Vixie, 1996.

 */

static int

inet_pton4(src, dst)

        const char *src;

        u_char *dst;

{

        static const char digits[] = "0123456789";

        int saw_digit, octets, ch;

        u_char tmp[NS_INADDRSZ], *tp;

        saw_digit = 0;

        octets = 0;

        *(tp = tmp) = 0;

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

                const char *pch;

                if ((pch = strchr(digits, ch)) != NULL) {

                        u_int new = *tp * 10 + (pch - digits);

                        if (new > 255)

                                return (0);

                        *tp = new;

                        if (! saw_digit) {

                                if (++octets > 4)

                                        return (0);

                                saw_digit = 1;

                        }

                } else if (ch == '.' && saw_digit) {

                        if (octets == 4)

                                return (0);

                        *++tp = 0;

                        saw_digit = 0;

                } else

                        return (0);

        }

        if (octets < 4)

                return (0);

        memcpy(dst, tmp, NS_INADDRSZ);

        return (1);

}

/* int

 * inet_pton6(src, dst)

 *      convert presentation level address to network order binary form.

 * return:

 *      1 if `src' is a valid [RFC1884 2.2] address, else 0.

 * notice:

 *      (1) does not touch `dst' unless it's returning 1.

 *      (2) :: in a full address is silently ignored.

 * credit:

 *      inspired by Mark Andrews.

 * author:

 *      Paul Vixie, 1996.

 */

static int

inet_pton6(src, dst)

        const char *src;

        u_char *dst;

{

        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;

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

        endp = tp + NS_IN6ADDRSZ;

        colonp = NULL;

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

        if (*src == ':')

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

                        return (0);

        curtok = src;

        saw_xdigit = 0;

        val = 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 (val > 0xffff)

                                return (0);

                        saw_xdigit = 1;

                        continue;

                }

                if (ch == ':') {

                        curtok = src;

                        if (!saw_xdigit) {

                                if (colonp)

                                        return (0);

                                colonp = tp;

                                continue;

                        }

                        if (tp + NS_INT16SZ > endp)

                                return (0);

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

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

                        saw_xdigit = 0;

                        val = 0;

                        continue;

                }

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

                    inet_pton4(curtok, tp) > 0) {

                        tp += NS_INADDRSZ;

                        saw_xdigit = 0;

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

                }

                return (0);

        }

        if (saw_xdigit) {

                if (tp + NS_INT16SZ > endp)

                        return (0);

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

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

        }

        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;

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

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

                        colonp[n - i] = 0;

                }

                tp = endp;

        }

        if (tp != endp)

                return (0);

        memcpy(dst, tmp, NS_IN6ADDRSZ);

        return (1);

}