src/windows/native/java/net/Inet6AddressImpl.c - toolchain/jdk/jdk9_jdk - Git at Google

 /*
  * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 #include <windows.h>
 #include <winsock2.h>
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <malloc.h>
 #include <sys/types.h>
 #include <process.h>

 #include "java_net_InetAddress.h"
 #include "java_net_Inet4AddressImpl.h"
 #include "java_net_Inet6AddressImpl.h"
 #include "net_util.h"
 #include "icmp.h"

 #ifdef WIN32
 #ifndef _WIN64

 /* Retain this code a little longer to support building in
  * old environments.  _MSC_VER is defined as:
  *     1200 for MSVC++ 6.0
  *     1310 for Vc7
  */
 #if defined(_MSC_VER) && _MSC_VER < 1310
 #define sockaddr_in6 SOCKADDR_IN6
 #endif
 #endif
 #define uint32_t UINT32
 #endif

 /*
  * Inet6AddressImpl
  */

 /*
  * Class:     java_net_Inet6AddressImpl
  * Method:    getLocalHostName
  * Signature: ()Ljava/lang/String;
  */
 JNIEXPORT jstring JNICALL
 Java_java_net_Inet6AddressImpl_getLocalHostName (JNIEnv *env, jobject this) {
     char hostname [256];

     if (gethostname (hostname, sizeof (hostname)) == -1) {
         strcpy (hostname, "localhost");
     }
     return JNU_NewStringPlatform (env, hostname);
 }

 static jclass ni_iacls;
 static jclass ni_ia4cls;
 static jclass ni_ia6cls;
 static jmethodID ni_ia4ctrID;
 static jmethodID ni_ia6ctrID;
 static jfieldID ni_iaaddressID;
 static jfieldID ni_iahostID;
 static jfieldID ni_iafamilyID;
 static jfieldID ni_ia6ipaddressID;
 static int initialized = 0;

 JNIEXPORT jobjectArray JNICALL
 Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
                                                 jstring host) {
     const char *hostname;
     jobjectArray ret = 0;
     int retLen = 0;
     jboolean preferIPv6Address;

     int error=0;
     struct addrinfo hints, *res, *resNew = NULL;

     if (!initialized) {
       ni_iacls = (*env)->FindClass(env, "java/net/InetAddress");
       ni_iacls = (*env)->NewGlobalRef(env, ni_iacls);
       ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address");
       ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls);
       ni_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");
       ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);
       ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");
       ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<init>", "()V");
       ni_iaaddressID = (*env)->GetFieldID(env, ni_iacls, "address", "I");
       ni_iafamilyID = (*env)->GetFieldID(env, ni_iacls, "family", "I");
       ni_iahostID = (*env)->GetFieldID(env, ni_iacls, "hostName", "Ljava/lang/String;");
       ni_ia6ipaddressID = (*env)->GetFieldID(env, ni_ia6cls, "ipaddress", "[B");
       initialized = 1;
     }
     if (IS_NULL(host)) {
         JNU_ThrowNullPointerException(env, "host is null");
         return 0;
     }
     hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE);
     CHECK_NULL_RETURN(hostname, NULL);

     if (NET_addrtransAvailable()) {
         static jfieldID ia_preferIPv6AddressID;
         if (ia_preferIPv6AddressID == NULL) {
             jclass c = (*env)->FindClass(env,"java/net/InetAddress");
             if (c)  {
                 ia_preferIPv6AddressID =
                     (*env)->GetStaticFieldID(env, c, "preferIPv6Address", "Z");
             }
             if (ia_preferIPv6AddressID == NULL) {
                 JNU_ReleaseStringPlatformChars(env, host, hostname);
                 return NULL;
             }
         }
         /* get the address preference */
         preferIPv6Address
             = (*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID);

         /* Try once, with our static buffer. */
         memset(&hints, 0, sizeof(hints));
         hints.ai_flags = AI_CANONNAME;
         hints.ai_family = AF_UNSPEC;

         error = (*getaddrinfo_ptr)(hostname, NULL, &hints, &res);

         if (error) {
             /* report error */
             JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException",
                             (char *)hostname);
             JNU_ReleaseStringPlatformChars(env, host, hostname);
             return NULL;
         } else {
             int i = 0;
             int inetCount = 0, inet6Count = 0, inetIndex, inet6Index;
             struct addrinfo *itr, *last, *iterator = res;
             while (iterator != NULL) {
                 int skip = 0;
                 itr = resNew;
                 while (itr != NULL) {
                     if (iterator->ai_family == itr->ai_family &&
                         iterator->ai_addrlen == itr->ai_addrlen) {
                         if (itr->ai_family == AF_INET) { /* AF_INET */
                             struct sockaddr_in *addr1, *addr2;
                             addr1 = (struct sockaddr_in *)iterator->ai_addr;
                             addr2 = (struct sockaddr_in *)itr->ai_addr;
                             if (addr1->sin_addr.s_addr ==
                                 addr2->sin_addr.s_addr) {
                                 skip = 1;
                                 break;
                             }
                         } else {
                             int t;
                             struct sockaddr_in6 *addr1, *addr2;
                             addr1 = (struct sockaddr_in6 *)iterator->ai_addr;
                             addr2 = (struct sockaddr_in6 *)itr->ai_addr;

                             for (t = 0; t < 16; t++) {
                                 if (addr1->sin6_addr.s6_addr[t] !=
                                     addr2->sin6_addr.s6_addr[t]) {
                                     break;
                                 }
                             }
                             if (t < 16) {
                                 itr = itr->ai_next;
                                 continue;
                             } else {
                                 skip = 1;
                                 break;
                             }
                         }
                     } else if (iterator->ai_family != AF_INET &&
                                iterator->ai_family != AF_INET6) {
                         /* we can't handle other family types */
                         skip = 1;
                         break;
                     }
                     itr = itr->ai_next;
                 }

                 if (!skip) {
                     struct addrinfo *next
                         = (struct addrinfo*) malloc(sizeof(struct addrinfo));
                     if (!next) {
                         JNU_ThrowOutOfMemoryError(env, "heap allocation failed");
                         ret = NULL;
                         goto cleanupAndReturn;
                     }
                     memcpy(next, iterator, sizeof(struct addrinfo));
                     next->ai_next = NULL;
                     if (resNew == NULL) {
                         resNew = next;
                     } else {
                         last->ai_next = next;
                     }
                     last = next;
                     i++;
                     if (iterator->ai_family == AF_INET) {
                         inetCount ++;
                     } else if (iterator->ai_family == AF_INET6) {
                         inet6Count ++;
                     }
                 }
                 iterator = iterator->ai_next;
             }
             retLen = i;
             iterator = resNew;
             i = 0;
             ret = (*env)->NewObjectArray(env, retLen, ni_iacls, NULL);

             if (IS_NULL(ret)) {
                 /* we may have memory to free at the end of this */
                 goto cleanupAndReturn;
             }

             if (preferIPv6Address) {
                 inetIndex = inet6Count;
                 inet6Index = 0;
             } else {
                 inetIndex = 0;
                 inet6Index = inetCount;
             }

             while (iterator != NULL) {
                 if (iterator->ai_family == AF_INET) {
                   jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID);
                   if (IS_NULL(iaObj)) {
                     ret = NULL;
                     goto cleanupAndReturn;
                   }
                   (*env)->SetIntField(env, iaObj, ni_iaaddressID,
                                       ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));
                   (*env)->SetObjectField(env, iaObj, ni_iahostID, host);
                   (*env)->SetObjectArrayElement(env, ret, inetIndex, iaObj);
                     inetIndex ++;
                 } else if (iterator->ai_family == AF_INET6) {
                   jint scope = 0;
                   jbyteArray ipaddress;
                   jobject iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);
                   if (IS_NULL(iaObj)) {
                     ret = NULL;
                     goto cleanupAndReturn;
                   }
                   ipaddress = (*env)->NewByteArray(env, 16);
                   if (IS_NULL(ipaddress)) {
                     ret = NULL;
                     goto cleanupAndReturn;
                   }
                   (*env)->SetByteArrayRegion(env, ipaddress, 0, 16,
                                              (jbyte *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));
                   scope = ((struct sockaddr_in6*)iterator->ai_addr)->sin6_scope_id;
                   if (scope != 0) { /* zero is default value, no need to set */
                     (*env)->SetIntField(env, iaObj, ia6_scopeidID, scope);
                     (*env)->SetBooleanField(env, iaObj, ia6_scopeidsetID, JNI_TRUE);
                   }
                   (*env)->SetObjectField(env, iaObj, ni_ia6ipaddressID, ipaddress);
                   (*env)->SetObjectField(env, iaObj, ni_iahostID, host);
                   (*env)->SetObjectArrayElement(env, ret, inet6Index, iaObj);
                   inet6Index ++;
                 }
                 iterator = iterator->ai_next;
             }
         }
     }

 cleanupAndReturn:
     {
         struct addrinfo *iterator, *tmp;
         iterator = resNew;
         while (iterator != NULL) {
             tmp = iterator;
             iterator = iterator->ai_next;
             free(tmp);
         }
         JNU_ReleaseStringPlatformChars(env, host, hostname);
     }

     if (NET_addrtransAvailable())
         (*freeaddrinfo_ptr)(res);

     return ret;
 }

 /*
  * Class:     java_net_Inet6AddressImpl
  * Method:    getHostByAddr
  * Signature: (I)Ljava/lang/String;
  */
 JNIEXPORT jstring JNICALL
 Java_java_net_Inet6AddressImpl_getHostByAddr(JNIEnv *env, jobject this,
                                             jbyteArray addrArray) {
     jstring ret = NULL;

     char host[NI_MAXHOST+1];
     int error = 0;
     int len = 0;
     jbyte caddr[16];

     if (NET_addrtransAvailable()) {
         struct sockaddr_in him4;
         struct sockaddr_in6 him6;
         struct sockaddr *sa;

         /*
          * For IPv4 addresses construct a sockaddr_in structure.
          */
         if ((*env)->GetArrayLength(env, addrArray) == 4) {
             jint addr;
             (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr);
             addr = ((caddr[0]<<24) & 0xff000000);
             addr |= ((caddr[1] <<16) & 0xff0000);
             addr |= ((caddr[2] <<8) & 0xff00);
             addr |= (caddr[3] & 0xff);
             memset((char *) &him4, 0, sizeof(him4));
             him4.sin_addr.s_addr = (uint32_t) htonl(addr);
             him4.sin_family = AF_INET;
             sa = (struct sockaddr *) &him4;
             len = sizeof(him4);
         } else {
             /*
              * For IPv6 address construct a sockaddr_in6 structure.
              */
             (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);
             memset((char *) &him6, 0, sizeof(him6));
             memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );
             him6.sin6_family = AF_INET6;
             sa = (struct sockaddr *) &him6 ;
             len = sizeof(him6) ;
         }

         error = (*getnameinfo_ptr)(sa, len, host, NI_MAXHOST, NULL, 0,
                                    NI_NAMEREQD);

         if (!error) {
             ret = (*env)->NewStringUTF(env, host);
         }
     }

     if (ret == NULL) {
         JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL);
     }

     return ret;
 }

 #ifdef AF_INET6


 /**
  * ping implementation.
  * Send a ICMP_ECHO_REQUEST packet every second until either the timeout
  * expires or a answer is received.
  * Returns true is an ECHO_REPLY is received, otherwise, false.
  */
 static jboolean
 ping6(JNIEnv *env, jint fd, struct SOCKADDR_IN6* him, jint timeout,
       struct SOCKADDR_IN6* netif, jint ttl) {
     jint size;
     jint n, len, i;
     char sendbuf[1500];
     char auxbuf[1500];
     unsigned char recvbuf[1500];
     struct icmp6_hdr *icmp6;
     struct SOCKADDR_IN6 sa_recv;
     unsigned short pid, seq;
     int read_rv = 0;
     WSAEVENT hEvent;
     struct ip6_pseudo_hdr *pseudo_ip6;
     int timestamp;
     int tmout2;

     /* Initialize the sequence number to a suitable random number and
        shift right one place to allow sufficient room for increamenting. */
     seq = ((unsigned short)rand()) >> 1;

     /* icmp_id is a 16 bit data type, therefore down cast the pid */
     pid = (unsigned short) _getpid();

     size = 60*1024;
     setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (const char *)&size, sizeof(size));
     /**
      * A TTL was specified, let's set the socket option.
      */
     if (ttl > 0) {
       setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, (const char *) &ttl, sizeof(ttl));
     }

     /**
      * A network interface was specified, let's bind to it.
      */
     if (netif != NULL) {
       if (NET_Bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) < 0){
         NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket to interface");
         closesocket(fd);
         return JNI_FALSE;
       }
     }

     /*
      * Make the socket non blocking
      */
     hEvent = WSACreateEvent();
     WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE);

     /**
      * send 1 ICMP REQUEST every second until either we get a valid reply
      * or the timeout expired.
      */
     do {
       /* let's tag the ECHO packet with our pid so we can identify it */
       timestamp = GetCurrentTime();
       memset(sendbuf, 0, 1500);
       icmp6 = (struct icmp6_hdr *) sendbuf;
       icmp6->icmp6_type = ICMP6_ECHO_REQUEST;
       icmp6->icmp6_code = 0;
       icmp6->icmp6_id = htons(pid);
       icmp6->icmp6_seq = htons(seq);
       icmp6->icmp6_cksum = 0;
       memcpy((icmp6 + 1), &timestamp, sizeof(int));
       if (netif != NULL) {
         memset(auxbuf, 0, 1500);
         pseudo_ip6 = (struct ip6_pseudo_hdr*) auxbuf;
         memcpy(&pseudo_ip6->ip6_src, &netif->sin6_addr, sizeof(struct in6_addr));
         memcpy(&pseudo_ip6->ip6_dst, &him->sin6_addr, sizeof(struct in6_addr));
         pseudo_ip6->ip6_plen= htonl( 64 );
         pseudo_ip6->ip6_nxt = htonl( IPPROTO_ICMPV6 );
         memcpy(auxbuf + sizeof(struct ip6_pseudo_hdr), icmp6, 64);
         /**
          * We shouldn't have to do that as computing the checksum is supposed
          * to be done by the IPv6 stack. Unfortunately windows, here too, is
          * uterly broken, or non compliant, so let's do it.
          * Problem is to compute the checksum I need to know the source address
          * which happens only if I know the interface to be used...
          */
         icmp6->icmp6_cksum = in_cksum((u_short *)pseudo_ip6, sizeof(struct ip6_pseudo_hdr) + 64);
       }

       /**
        * Ping!
        */
       n = sendto(fd, sendbuf, 64, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6));
       if (n < 0 && (WSAGetLastError() == WSAEINTR || WSAGetLastError() == WSAEADDRNOTAVAIL)) {
         // Happens when using a "tunnel interface" for instance.
         // Or trying to send a packet on a different scope.
         closesocket(fd);
         WSACloseEvent(hEvent);
         return JNI_FALSE;
       }
       if (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK) {
         NET_ThrowNew(env, WSAGetLastError(), "Can't send ICMP packet");
         closesocket(fd);
         WSACloseEvent(hEvent);
         return JNI_FALSE;
       }

       tmout2 = timeout > 1000 ? 1000 : timeout;
       do {
         tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2);

         if (tmout2 >= 0) {
           len = sizeof(sa_recv);
           memset(recvbuf, 0, 1500);
           /**
            * For some unknown reason, besides plain stupidity, windows
            * truncates the first 4 bytes of the icmpv6 header some we can't
            * check for the ICMP_ECHOREPLY value.
            * we'll check the other values, though
            */
           n = recvfrom(fd, recvbuf + 4, sizeof(recvbuf) - 4, 0, (struct sockaddr*) &sa_recv, &len);
           icmp6 = (struct icmp6_hdr *) (recvbuf);
           memcpy(&i, (icmp6 + 1), sizeof(int));
           /**
            * Is that the reply we were expecting?
            */
           if (n >= 8 && ntohs(icmp6->icmp6_seq) == seq &&
               ntohs(icmp6->icmp6_id) == pid && i == timestamp) {
             closesocket(fd);
             WSACloseEvent(hEvent);
             return JNI_TRUE;
           }
         }
       } while (tmout2 > 0);
       timeout -= 1000;
       seq++;
     } while (timeout > 0);
     closesocket(fd);
     WSACloseEvent(hEvent);
     return JNI_FALSE;
 }
 #endif /* AF_INET6 */

 /*
  * Class:     java_net_Inet6AddressImpl
  * Method:    isReachable0
  * Signature: ([bII[bI)Z
  */
 JNIEXPORT jboolean JNICALL
 Java_java_net_Inet6AddressImpl_isReachable0(JNIEnv *env, jobject this,
                                            jbyteArray addrArray,
                                            jint scope,
                                            jint timeout,
                                            jbyteArray ifArray,
                                            jint ttl, jint if_scope) {
 #ifdef AF_INET6
     jbyte caddr[16];
     jint fd, sz;
     struct sockaddr_in6 him6;
     struct sockaddr_in6* netif = NULL;
     struct sockaddr_in6 inf6;
     WSAEVENT hEvent;
     int len = 0;
     int connect_rv = -1;

     /*
      * If IPv6 is not enable, then we can't reach an IPv6 address, can we?
      * Actually, we probably shouldn't even get here.
      */
     if (!ipv6_available()) {
       return JNI_FALSE;
     }
     /*
      * If it's an IPv4 address, ICMP won't work with IPv4 mapped address,
      * therefore, let's delegate to the Inet4Address method.
      */
     sz = (*env)->GetArrayLength(env, addrArray);
     if (sz == 4) {
       return Java_java_net_Inet4AddressImpl_isReachable0(env, this,
                                                          addrArray,
                                                          timeout,
                                                          ifArray, ttl);
     }

     memset((char *) caddr, 0, 16);
     memset((char *) &him6, 0, sizeof(him6));
     (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);
     memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );
     him6.sin6_family = AF_INET6;
     if (scope > 0) {
       him6.sin6_scope_id = scope;
     }
     len = sizeof(struct sockaddr_in6);
     /**
      * A network interface was specified, let's convert the address
      */
     if (!(IS_NULL(ifArray))) {
       memset((char *) caddr, 0, 16);
       memset((char *) &inf6, 0, sizeof(inf6));
       (*env)->GetByteArrayRegion(env, ifArray, 0, 16, caddr);
       memcpy((void *)&(inf6.sin6_addr), caddr, sizeof(struct in6_addr) );
       inf6.sin6_family = AF_INET6;
       inf6.sin6_port = 0;
       inf6.sin6_scope_id = if_scope;
       netif = &inf6;
     }

 #if 0
     /*
      * Windows implementation of ICMP & RAW sockets is too unreliable for now.
      * Therefore it's best not to try it at all and rely only on TCP
      * We may revisit and enable this code in the future.
      */

     /*
      * Right now, windows doesn't generate the ICMP checksum automatically
      * so we have to compute it, but we can do it only if we know which
      * interface will be used. Therefore, don't try to use ICMP if no
      * interface was specified.
      * When ICMPv6 support improves in windows, we may change this.
      */
     if (!(IS_NULL(ifArray))) {
       /*
        * If we can create a RAW socket, then when can use the ICMP ECHO_REQUEST
        * otherwise we'll try a tcp socket to the Echo port (7).
        * Note that this is empiric, and not connecting could mean it's blocked
        * or the echo servioe has been disabled.
        */
       fd = NET_Socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);

       if (fd != -1) { /* Good to go, let's do a ping */
         return ping6(env, fd, &him6, timeout, netif, ttl);
       }
     }
 #endif

     /* No good, let's fall back on TCP */
     fd = NET_Socket(AF_INET6, SOCK_STREAM, 0);
     if (fd == JVM_IO_ERR) {
         /* note: if you run out of fds, you may not be able to load
          * the exception class, and get a NoClassDefFoundError
          * instead.
          */
         NET_ThrowNew(env, errno, "Can't create socket");
         return JNI_FALSE;
     }

     /**
      * A TTL was specified, let's set the socket option.
      */
     if (ttl > 0) {
       setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, (const char *)&ttl, sizeof(ttl));
     }

     /**
      * A network interface was specified, let's bind to it.
      */
     if (netif != NULL) {
       if (NET_Bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) < 0) {
         NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket to interface");
         closesocket(fd);
         return JNI_FALSE;
       }
     }

     /**
      * Make the socket non blocking.
      */
     hEvent = WSACreateEvent();
     WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE);

     /* no need to use NET_Connect as non-blocking */
     him6.sin6_port = htons((short) 7); /* Echo port */
     connect_rv = connect(fd, (struct sockaddr *)&him6, len);

     /**
      * connection established or refused immediately, either way it means
      * we were able to reach the host!
      */
     if (connect_rv == 0 || WSAGetLastError() == WSAECONNREFUSED) {
         WSACloseEvent(hEvent);
         closesocket(fd);
         return JNI_TRUE;
     } else {
         int optlen;

         switch (WSAGetLastError()) {
         case WSAEHOSTUNREACH:   /* Host Unreachable */
         case WSAENETUNREACH:    /* Network Unreachable */
         case WSAENETDOWN:       /* Network is down */
         case WSAEPFNOSUPPORT:   /* Protocol Family unsupported */
           WSACloseEvent(hEvent);
           closesocket(fd);
           return JNI_FALSE;
         }

         if (WSAGetLastError() != WSAEWOULDBLOCK) {
             NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException",
                                          "connect failed");
             WSACloseEvent(hEvent);
             closesocket(fd);
             return JNI_FALSE;
         }

         timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout);

         if (timeout >= 0) {
           /* has connection been established? */
           optlen = sizeof(connect_rv);
           if (JVM_GetSockOpt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv,
                              &optlen) <0) {
             connect_rv = WSAGetLastError();
           }

           if (connect_rv == 0 || connect_rv == WSAECONNREFUSED) {
             WSACloseEvent(hEvent);
             closesocket(fd);
             return JNI_TRUE;
           }
         }
     }
     WSACloseEvent(hEvent);
     closesocket(fd);
 #endif /* AF_INET6 */
     return JNI_FALSE;
 }
	/*
	* Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	#include <windows.h>
	#include <winsock2.h>
	#include <ctype.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <malloc.h>
	#include <sys/types.h>
	#include <process.h>

	#include "java_net_InetAddress.h"
	#include "java_net_Inet4AddressImpl.h"
	#include "java_net_Inet6AddressImpl.h"
	#include "net_util.h"
	#include "icmp.h"

	#ifdef WIN32
	#ifndef _WIN64

	/* Retain this code a little longer to support building in
	* old environments. _MSC_VER is defined as:
	* 1200 for MSVC++ 6.0
	* 1310 for Vc7
	*/
	#if defined(_MSC_VER) && _MSC_VER < 1310
	#define sockaddr_in6 SOCKADDR_IN6
	#endif
	#endif
	#define uint32_t UINT32
	#endif

	/*
	* Inet6AddressImpl
	*/

	/*
	* Class: java_net_Inet6AddressImpl
	* Method: getLocalHostName
	* Signature: ()Ljava/lang/String;
	*/
	JNIEXPORT jstring JNICALL
	Java_java_net_Inet6AddressImpl_getLocalHostName (JNIEnv *env, jobject this) {
	char hostname [256];

	if (gethostname (hostname, sizeof (hostname)) == -1) {
	strcpy (hostname, "localhost");
	}
	return JNU_NewStringPlatform (env, hostname);
	}

	static jclass ni_iacls;
	static jclass ni_ia4cls;
	static jclass ni_ia6cls;
	static jmethodID ni_ia4ctrID;
	static jmethodID ni_ia6ctrID;
	static jfieldID ni_iaaddressID;
	static jfieldID ni_iahostID;
	static jfieldID ni_iafamilyID;
	static jfieldID ni_ia6ipaddressID;
	static int initialized = 0;

	JNIEXPORT jobjectArray JNICALL
	Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
	jstring host) {
	const char *hostname;
	jobjectArray ret = 0;
	int retLen = 0;
	jboolean preferIPv6Address;

	int error=0;
	struct addrinfo hints, res, resNew = NULL;

	if (!initialized) {
	ni_iacls = (*env)->FindClass(env, "java/net/InetAddress");
	ni_iacls = (*env)->NewGlobalRef(env, ni_iacls);
	ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address");
	ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls);
	ni_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");
	ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);
	ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");
	ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<init>", "()V");
	ni_iaaddressID = (*env)->GetFieldID(env, ni_iacls, "address", "I");
	ni_iafamilyID = (*env)->GetFieldID(env, ni_iacls, "family", "I");
	ni_iahostID = (*env)->GetFieldID(env, ni_iacls, "hostName", "Ljava/lang/String;");
	ni_ia6ipaddressID = (*env)->GetFieldID(env, ni_ia6cls, "ipaddress", "[B");
	initialized = 1;
	}
	if (IS_NULL(host)) {
	JNU_ThrowNullPointerException(env, "host is null");
	return 0;
	}
	hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE);
	CHECK_NULL_RETURN(hostname, NULL);

	if (NET_addrtransAvailable()) {
	static jfieldID ia_preferIPv6AddressID;
	if (ia_preferIPv6AddressID == NULL) {
	jclass c = (*env)->FindClass(env,"java/net/InetAddress");
	if (c) {
	ia_preferIPv6AddressID =
	(*env)->GetStaticFieldID(env, c, "preferIPv6Address", "Z");
	}
	if (ia_preferIPv6AddressID == NULL) {
	JNU_ReleaseStringPlatformChars(env, host, hostname);
	return NULL;
	}
	}
	/* get the address preference */
	preferIPv6Address
	= (*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID);

	/* Try once, with our static buffer. */
	memset(&hints, 0, sizeof(hints));
	hints.ai_flags = AI_CANONNAME;
	hints.ai_family = AF_UNSPEC;

	error = (*getaddrinfo_ptr)(hostname, NULL, &hints, &res);

	if (error) {
	/* report error */
	JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException",
	(char *)hostname);
	JNU_ReleaseStringPlatformChars(env, host, hostname);
	return NULL;
	} else {
	int i = 0;
	int inetCount = 0, inet6Count = 0, inetIndex, inet6Index;
	struct addrinfo itr, last, *iterator = res;
	while (iterator != NULL) {
	int skip = 0;
	itr = resNew;
	while (itr != NULL) {
	if (iterator->ai_family == itr->ai_family &&
	iterator->ai_addrlen == itr->ai_addrlen) {
	if (itr->ai_family == AF_INET) { /* AF_INET */
	struct sockaddr_in addr1, addr2;
	addr1 = (struct sockaddr_in *)iterator->ai_addr;
	addr2 = (struct sockaddr_in *)itr->ai_addr;
	if (addr1->sin_addr.s_addr ==
	addr2->sin_addr.s_addr) {
	skip = 1;
	break;
	}
	} else {
	int t;
	struct sockaddr_in6 addr1, addr2;
	addr1 = (struct sockaddr_in6 *)iterator->ai_addr;
	addr2 = (struct sockaddr_in6 *)itr->ai_addr;

	for (t = 0; t < 16; t++) {
	if (addr1->sin6_addr.s6_addr[t] !=
	addr2->sin6_addr.s6_addr[t]) {
	break;
	}
	}
	if (t < 16) {
	itr = itr->ai_next;
	continue;
	} else {
	skip = 1;
	break;
	}
	}
	} else if (iterator->ai_family != AF_INET &&
	iterator->ai_family != AF_INET6) {
	/* we can't handle other family types */
	skip = 1;
	break;
	}
	itr = itr->ai_next;
	}

	if (!skip) {
	struct addrinfo *next
	= (struct addrinfo*) malloc(sizeof(struct addrinfo));
	if (!next) {
	JNU_ThrowOutOfMemoryError(env, "heap allocation failed");
	ret = NULL;
	goto cleanupAndReturn;
	}
	memcpy(next, iterator, sizeof(struct addrinfo));
	next->ai_next = NULL;
	if (resNew == NULL) {
	resNew = next;
	} else {
	last->ai_next = next;
	}
	last = next;
	i++;
	if (iterator->ai_family == AF_INET) {
	inetCount ++;
	} else if (iterator->ai_family == AF_INET6) {
	inet6Count ++;
	}
	}
	iterator = iterator->ai_next;
	}
	retLen = i;
	iterator = resNew;
	i = 0;
	ret = (*env)->NewObjectArray(env, retLen, ni_iacls, NULL);

	if (IS_NULL(ret)) {
	/* we may have memory to free at the end of this */
	goto cleanupAndReturn;
	}

	if (preferIPv6Address) {
	inetIndex = inet6Count;
	inet6Index = 0;
	} else {
	inetIndex = 0;
	inet6Index = inetCount;
	}

	while (iterator != NULL) {
	if (iterator->ai_family == AF_INET) {
	jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID);
	if (IS_NULL(iaObj)) {
	ret = NULL;
	goto cleanupAndReturn;
	}
	(*env)->SetIntField(env, iaObj, ni_iaaddressID,
	ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));
	(*env)->SetObjectField(env, iaObj, ni_iahostID, host);
	(*env)->SetObjectArrayElement(env, ret, inetIndex, iaObj);
	inetIndex ++;
	} else if (iterator->ai_family == AF_INET6) {
	jint scope = 0;
	jbyteArray ipaddress;
	jobject iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);
	if (IS_NULL(iaObj)) {
	ret = NULL;
	goto cleanupAndReturn;
	}
	ipaddress = (*env)->NewByteArray(env, 16);
	if (IS_NULL(ipaddress)) {
	ret = NULL;
	goto cleanupAndReturn;
	}
	(*env)->SetByteArrayRegion(env, ipaddress, 0, 16,
	(jbyte )&(((struct sockaddr_in6)iterator->ai_addr)->sin6_addr));
	scope = ((struct sockaddr_in6*)iterator->ai_addr)->sin6_scope_id;
	if (scope != 0) { /* zero is default value, no need to set */
	(*env)->SetIntField(env, iaObj, ia6_scopeidID, scope);
	(*env)->SetBooleanField(env, iaObj, ia6_scopeidsetID, JNI_TRUE);
	}
	(*env)->SetObjectField(env, iaObj, ni_ia6ipaddressID, ipaddress);
	(*env)->SetObjectField(env, iaObj, ni_iahostID, host);
	(*env)->SetObjectArrayElement(env, ret, inet6Index, iaObj);
	inet6Index ++;
	}
	iterator = iterator->ai_next;
	}
	}
	}

	cleanupAndReturn:
	{
	struct addrinfo iterator, tmp;
	iterator = resNew;
	while (iterator != NULL) {
	tmp = iterator;
	iterator = iterator->ai_next;
	free(tmp);
	}
	JNU_ReleaseStringPlatformChars(env, host, hostname);
	}

	if (NET_addrtransAvailable())
	(*freeaddrinfo_ptr)(res);

	return ret;
	}

	/*
	* Class: java_net_Inet6AddressImpl
	* Method: getHostByAddr
	* Signature: (I)Ljava/lang/String;
	*/
	JNIEXPORT jstring JNICALL
	Java_java_net_Inet6AddressImpl_getHostByAddr(JNIEnv *env, jobject this,
	jbyteArray addrArray) {
	jstring ret = NULL;

	char host[NI_MAXHOST+1];
	int error = 0;
	int len = 0;
	jbyte caddr[16];

	if (NET_addrtransAvailable()) {
	struct sockaddr_in him4;
	struct sockaddr_in6 him6;
	struct sockaddr *sa;

	/*
	* For IPv4 addresses construct a sockaddr_in structure.
	*/
	if ((*env)->GetArrayLength(env, addrArray) == 4) {
	jint addr;
	(*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr);
	addr = ((caddr[0]<<24) & 0xff000000);
	addr \|= ((caddr[1] <<16) & 0xff0000);
	addr \|= ((caddr[2] <<8) & 0xff00);
	addr \|= (caddr[3] & 0xff);
	memset((char *) &him4, 0, sizeof(him4));
	him4.sin_addr.s_addr = (uint32_t) htonl(addr);
	him4.sin_family = AF_INET;
	sa = (struct sockaddr *) &him4;
	len = sizeof(him4);
	} else {
	/*
	* For IPv6 address construct a sockaddr_in6 structure.
	*/
	(*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);
	memset((char *) &him6, 0, sizeof(him6));
	memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );
	him6.sin6_family = AF_INET6;
	sa = (struct sockaddr *) &him6 ;
	len = sizeof(him6) ;
	}

	error = (*getnameinfo_ptr)(sa, len, host, NI_MAXHOST, NULL, 0,
	NI_NAMEREQD);

	if (!error) {
	ret = (*env)->NewStringUTF(env, host);
	}
	}

	if (ret == NULL) {
	JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL);
	}

	return ret;
	}

	#ifdef AF_INET6


	/**
	* ping implementation.
	* Send a ICMP_ECHO_REQUEST packet every second until either the timeout
	* expires or a answer is received.
	* Returns true is an ECHO_REPLY is received, otherwise, false.
	*/
	static jboolean
	ping6(JNIEnv env, jint fd, struct SOCKADDR_IN6 him, jint timeout,
	struct SOCKADDR_IN6* netif, jint ttl) {
	jint size;
	jint n, len, i;
	char sendbuf[1500];
	char auxbuf[1500];
	unsigned char recvbuf[1500];
	struct icmp6_hdr *icmp6;
	struct SOCKADDR_IN6 sa_recv;
	unsigned short pid, seq;
	int read_rv = 0;
	WSAEVENT hEvent;
	struct ip6_pseudo_hdr *pseudo_ip6;
	int timestamp;
	int tmout2;

	/* Initialize the sequence number to a suitable random number and
	shift right one place to allow sufficient room for increamenting. */
	seq = ((unsigned short)rand()) >> 1;

	/* icmp_id is a 16 bit data type, therefore down cast the pid */
	pid = (unsigned short) _getpid();

	size = 60*1024;
	setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (const char *)&size, sizeof(size));
	/**
	* A TTL was specified, let's set the socket option.
	*/
	if (ttl > 0) {
	setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, (const char *) &ttl, sizeof(ttl));
	}

	/**
	* A network interface was specified, let's bind to it.
	*/
	if (netif != NULL) {
	if (NET_Bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) < 0){
	NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket to interface");
	closesocket(fd);
	return JNI_FALSE;
	}
	}

	/*
	* Make the socket non blocking
	*/
	hEvent = WSACreateEvent();
	WSAEventSelect(fd, hEvent, FD_READ\|FD_CONNECT\|FD_CLOSE);

	/**
	* send 1 ICMP REQUEST every second until either we get a valid reply
	* or the timeout expired.
	*/
	do {
	/* let's tag the ECHO packet with our pid so we can identify it */
	timestamp = GetCurrentTime();
	memset(sendbuf, 0, 1500);
	icmp6 = (struct icmp6_hdr *) sendbuf;
	icmp6->icmp6_type = ICMP6_ECHO_REQUEST;
	icmp6->icmp6_code = 0;
	icmp6->icmp6_id = htons(pid);
	icmp6->icmp6_seq = htons(seq);
	icmp6->icmp6_cksum = 0;
	memcpy((icmp6 + 1), &timestamp, sizeof(int));
	if (netif != NULL) {
	memset(auxbuf, 0, 1500);
	pseudo_ip6 = (struct ip6_pseudo_hdr*) auxbuf;
	memcpy(&pseudo_ip6->ip6_src, &netif->sin6_addr, sizeof(struct in6_addr));
	memcpy(&pseudo_ip6->ip6_dst, &him->sin6_addr, sizeof(struct in6_addr));
	pseudo_ip6->ip6_plen= htonl( 64 );
	pseudo_ip6->ip6_nxt = htonl( IPPROTO_ICMPV6 );
	memcpy(auxbuf + sizeof(struct ip6_pseudo_hdr), icmp6, 64);
	/**
	* We shouldn't have to do that as computing the checksum is supposed
	* to be done by the IPv6 stack. Unfortunately windows, here too, is
	* uterly broken, or non compliant, so let's do it.
	* Problem is to compute the checksum I need to know the source address
	* which happens only if I know the interface to be used...
	*/
	icmp6->icmp6_cksum = in_cksum((u_short *)pseudo_ip6, sizeof(struct ip6_pseudo_hdr) + 64);
	}

	/**
	* Ping!
	*/
	n = sendto(fd, sendbuf, 64, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6));
	if (n < 0 && (WSAGetLastError() == WSAEINTR \|\| WSAGetLastError() == WSAEADDRNOTAVAIL)) {
	// Happens when using a "tunnel interface" for instance.
	// Or trying to send a packet on a different scope.
	closesocket(fd);
	WSACloseEvent(hEvent);
	return JNI_FALSE;
	}
	if (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK) {
	NET_ThrowNew(env, WSAGetLastError(), "Can't send ICMP packet");
	closesocket(fd);
	WSACloseEvent(hEvent);
	return JNI_FALSE;
	}

	tmout2 = timeout > 1000 ? 1000 : timeout;
	do {
	tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2);

	if (tmout2 >= 0) {
	len = sizeof(sa_recv);
	memset(recvbuf, 0, 1500);
	/**
	* For some unknown reason, besides plain stupidity, windows
	* truncates the first 4 bytes of the icmpv6 header some we can't
	* check for the ICMP_ECHOREPLY value.
	* we'll check the other values, though
	*/
	n = recvfrom(fd, recvbuf + 4, sizeof(recvbuf) - 4, 0, (struct sockaddr*) &sa_recv, &len);
	icmp6 = (struct icmp6_hdr *) (recvbuf);
	memcpy(&i, (icmp6 + 1), sizeof(int));
	/**
	* Is that the reply we were expecting?
	*/
	if (n >= 8 && ntohs(icmp6->icmp6_seq) == seq &&
	ntohs(icmp6->icmp6_id) == pid && i == timestamp) {
	closesocket(fd);
	WSACloseEvent(hEvent);
	return JNI_TRUE;
	}
	}
	} while (tmout2 > 0);
	timeout -= 1000;
	seq++;
	} while (timeout > 0);
	closesocket(fd);
	WSACloseEvent(hEvent);
	return JNI_FALSE;
	}
	#endif /* AF_INET6 */

	/*
	* Class: java_net_Inet6AddressImpl
	* Method: isReachable0
	* Signature: ([bII[bI)Z
	*/
	JNIEXPORT jboolean JNICALL
	Java_java_net_Inet6AddressImpl_isReachable0(JNIEnv *env, jobject this,
	jbyteArray addrArray,
	jint scope,
	jint timeout,
	jbyteArray ifArray,
	jint ttl, jint if_scope) {
	#ifdef AF_INET6
	jbyte caddr[16];
	jint fd, sz;
	struct sockaddr_in6 him6;
	struct sockaddr_in6* netif = NULL;
	struct sockaddr_in6 inf6;
	WSAEVENT hEvent;
	int len = 0;
	int connect_rv = -1;

	/*
	* If IPv6 is not enable, then we can't reach an IPv6 address, can we?
	* Actually, we probably shouldn't even get here.
	*/
	if (!ipv6_available()) {
	return JNI_FALSE;
	}
	/*
	* If it's an IPv4 address, ICMP won't work with IPv4 mapped address,
	* therefore, let's delegate to the Inet4Address method.
	*/
	sz = (*env)->GetArrayLength(env, addrArray);
	if (sz == 4) {
	return Java_java_net_Inet4AddressImpl_isReachable0(env, this,
	addrArray,
	timeout,
	ifArray, ttl);
	}

	memset((char *) caddr, 0, 16);
	memset((char *) &him6, 0, sizeof(him6));
	(*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);
	memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );
	him6.sin6_family = AF_INET6;
	if (scope > 0) {
	him6.sin6_scope_id = scope;
	}
	len = sizeof(struct sockaddr_in6);
	/**
	* A network interface was specified, let's convert the address
	*/
	if (!(IS_NULL(ifArray))) {
	memset((char *) caddr, 0, 16);
	memset((char *) &inf6, 0, sizeof(inf6));
	(*env)->GetByteArrayRegion(env, ifArray, 0, 16, caddr);
	memcpy((void *)&(inf6.sin6_addr), caddr, sizeof(struct in6_addr) );
	inf6.sin6_family = AF_INET6;
	inf6.sin6_port = 0;
	inf6.sin6_scope_id = if_scope;
	netif = &inf6;
	}

	#if 0
	/*
	* Windows implementation of ICMP & RAW sockets is too unreliable for now.
	* Therefore it's best not to try it at all and rely only on TCP
	* We may revisit and enable this code in the future.
	*/

	/*
	* Right now, windows doesn't generate the ICMP checksum automatically
	* so we have to compute it, but we can do it only if we know which
	* interface will be used. Therefore, don't try to use ICMP if no
	* interface was specified.
	* When ICMPv6 support improves in windows, we may change this.
	*/
	if (!(IS_NULL(ifArray))) {
	/*
	* If we can create a RAW socket, then when can use the ICMP ECHO_REQUEST
	* otherwise we'll try a tcp socket to the Echo port (7).
	* Note that this is empiric, and not connecting could mean it's blocked
	* or the echo servioe has been disabled.
	*/
	fd = NET_Socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);

	if (fd != -1) { /* Good to go, let's do a ping */
	return ping6(env, fd, &him6, timeout, netif, ttl);
	}
	}
	#endif

	/* No good, let's fall back on TCP */
	fd = NET_Socket(AF_INET6, SOCK_STREAM, 0);
	if (fd == JVM_IO_ERR) {
	/* note: if you run out of fds, you may not be able to load
	* the exception class, and get a NoClassDefFoundError
	* instead.
	*/
	NET_ThrowNew(env, errno, "Can't create socket");
	return JNI_FALSE;
	}

	/**
	* A TTL was specified, let's set the socket option.
	*/
	if (ttl > 0) {
	setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, (const char *)&ttl, sizeof(ttl));
	}

	/**
	* A network interface was specified, let's bind to it.
	*/
	if (netif != NULL) {
	if (NET_Bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) < 0) {
	NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket to interface");
	closesocket(fd);
	return JNI_FALSE;
	}
	}

	/**
	* Make the socket non blocking.
	*/
	hEvent = WSACreateEvent();
	WSAEventSelect(fd, hEvent, FD_READ\|FD_CONNECT\|FD_CLOSE);

	/* no need to use NET_Connect as non-blocking */
	him6.sin6_port = htons((short) 7); /* Echo port */
	connect_rv = connect(fd, (struct sockaddr *)&him6, len);

	/**
	* connection established or refused immediately, either way it means
	* we were able to reach the host!
	*/
	if (connect_rv == 0 \|\| WSAGetLastError() == WSAECONNREFUSED) {
	WSACloseEvent(hEvent);
	closesocket(fd);
	return JNI_TRUE;
	} else {
	int optlen;

	switch (WSAGetLastError()) {
	case WSAEHOSTUNREACH: /* Host Unreachable */
	case WSAENETUNREACH: /* Network Unreachable */
	case WSAENETDOWN: /* Network is down */
	case WSAEPFNOSUPPORT: /* Protocol Family unsupported */
	WSACloseEvent(hEvent);
	closesocket(fd);
	return JNI_FALSE;
	}

	if (WSAGetLastError() != WSAEWOULDBLOCK) {
	NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException",
	"connect failed");
	WSACloseEvent(hEvent);
	closesocket(fd);
	return JNI_FALSE;
	}

	timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout);

	if (timeout >= 0) {
	/* has connection been established? */
	optlen = sizeof(connect_rv);
	if (JVM_GetSockOpt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv,
	&optlen) <0) {
	connect_rv = WSAGetLastError();
	}

	if (connect_rv == 0 \|\| connect_rv == WSAECONNREFUSED) {
	WSACloseEvent(hEvent);
	closesocket(fd);
	return JNI_TRUE;
	}
	}
	}
	WSACloseEvent(hEvent);
	closesocket(fd);
	#endif /* AF_INET6 */
	return JNI_FALSE;
	}