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diff --git a/snmplib/inet_pton.c b/snmplib/inet_pton.c
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+/* Id: inet_pton.c,v 1.5 2001/04/13 15:24:35 lukem Exp */
+/* $NetBSD: inet_pton.c,v 1.16 2000/02/07 18:51:02 itojun Exp $ */
+
+/* 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.
+ */
+
+#include <net-snmp/net-snmp-config.h>
+
+#ifndef HAVE_INET_PTON
+
+#include <ctype.h>
+
+#if HAVE_ARPA_NAMESER_H
+#include <arpa/nameser.h>
+#endif
+
+#if defined(HAVE_WINSOCK_H)
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#endif
+#include <errno.h>
+#include <stdio.h>
+#if HAVE_STRING_H
+#include <string.h>
+#else
+#include <strings.h>
+#endif
+
+#include <net-snmp/types.h>
+
+#ifndef EAFNOSUPPORT
+#define EAFNOSUPPORT WSAEAFNOSUPPORT
+#endif
+
+#ifndef IN6ADDRSZ
+#define IN6ADDRSZ 16
+#endif
+
+#ifndef INT16SZ
+#define INT16SZ 2
+#endif
+ /*
+ * End of Net-SNMP Win32 additions
+ */
+
+#ifndef INADDRSZ
+#define INADDRSZ 4
+#endif
+
+/*
+ * 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(const char *src, u_char *dst, int pton);
+#ifdef NETSNMP_ENABLE_IPV6
+static int inet_pton6(const char *src, u_char *dst);
+#endif
+
+/* 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, 1));
+#ifdef NETSNMP_ENABLE_IPV6
+ case AF_INET6:
+ return (inet_pton6(src, dst));
+#endif
+ default:
+ errno = EAFNOSUPPORT;
+ return (-1);
+ }
+ /* NOTREACHED */
+}
+
+/* int
+ * inet_pton4(src, dst, pton)
+ * when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand.
+ * when last arg is 1: inet_pton(). decimal dotted-quad only.
+ * return:
+ * 1 if `src' is a valid input, else 0.
+ * notice:
+ * does not touch `dst' unless it's returning 1.
+ * author:
+ * Paul Vixie, 1996.
+ */
+static int
+inet_pton4(src, dst, pton)
+ const char *src;
+ u_char *dst;
+ int pton;
+{
+ u_int val;
+ u_int digit;
+ int base, n;
+ unsigned char c;
+ u_int parts[4];
+ register u_int *pp = parts;
+
+ c = *src;
+ for (;;) {
+ /*
+ * Collect number up to ``.''.
+ * Values are specified as for C:
+ * 0x=hex, 0=octal, isdigit=decimal.
+ */
+ if (!isdigit(c))
+ return (0);
+ val = 0; base = 10;
+ if (c == '0') {
+ c = *++src;
+ if (c == 'x' || c == 'X')
+ base = 16, c = *++src;
+ else if (isdigit(c) && c != '9')
+ base = 8;
+ }
+ /* inet_pton() takes decimal only */
+ if (pton && base != 10)
+ return (0);
+ for (;;) {
+ if (isdigit(c)) {
+ digit = c - '0';
+ if ((int)digit >= base)
+ break;
+ val = (val * base) + digit;
+ c = *++src;
+ } else if (base == 16 && isxdigit(c)) {
+ digit = c + 10 - (islower(c) ? 'a' : 'A');
+ if (digit >= 16)
+ break;
+ val = (val << 4) | digit;
+ c = *++src;
+ } else
+ break;
+ }
+ if (c == '.') {
+ /*
+ * Internet format:
+ * a.b.c.d
+ * a.b.c (with c treated as 16 bits)
+ * a.b (with b treated as 24 bits)
+ * a (with a treated as 32 bits)
+ */
+ if (pp >= parts + 3)
+ return (0);
+ *pp++ = val;
+ c = *++src;
+ } else
+ break;
+ }
+ /*
+ * Check for trailing characters.
+ */
+ if (c != '\0' && !isspace(c))
+ return (0);
+ /*
+ * Concoct the address according to
+ * the number of parts specified.
+ */
+ n = pp - parts + 1;
+ /* inet_pton() takes dotted-quad only. it does not take shorthand. */
+ if (pton && n != 4)
+ return (0);
+ switch (n) {
+
+ case 0:
+ return (0); /* initial nondigit */
+
+ case 1: /* a -- 32 bits */
+ break;
+
+ case 2: /* a.b -- 8.24 bits */
+ if (parts[0] > 0xff || val > 0xffffff)
+ return (0);
+ val |= parts[0] << 24;
+ break;
+
+ case 3: /* a.b.c -- 8.8.16 bits */
+ if ((parts[0] | parts[1]) > 0xff || val > 0xffff)
+ return (0);
+ val |= (parts[0] << 24) | (parts[1] << 16);
+ break;
+
+ case 4: /* a.b.c.d -- 8.8.8.8 bits */
+ if ((parts[0] | parts[1] | parts[2] | val) > 0xff)
+ return (0);
+ val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+ break;
+ }
+ if (dst) {
+ val = htonl(val);
+ memcpy(dst, &val, INADDRSZ);
+ }
+ return (1);
+}
+
+#ifdef NETSNMP_ENABLE_IPV6
+/* 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[IN6ADDRSZ], *tp, *endp, *colonp;
+ const char *xdigits, *curtok;
+ int ch, saw_xdigit;
+ u_int val;
+
+ memset((tp = tmp), '\0', IN6ADDRSZ);
+ endp = tp + 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;
+ } else if (*src == '\0')
+ return (0);
+ if (tp + INT16SZ > endp)
+ return (0);
+ *tp++ = (u_char) (val >> 8) & 0xff;
+ *tp++ = (u_char) val & 0xff;
+ saw_xdigit = 0;
+ val = 0;
+ continue;
+ }
+ if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
+ inet_pton4(curtok, tp, 1) > 0) {
+ tp += INADDRSZ;
+ saw_xdigit = 0;
+ break; /* '\0' was seen by inet_pton4(). */
+ }
+ return (0);
+ }
+ if (saw_xdigit) {
+ if (tp + 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;
+
+ if (tp == endp)
+ return (0);
+ 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, IN6ADDRSZ);
+ return (1);
+}
+#endif
+
+#endif /* HAVE_INET_PTON */
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