/*

 * Copyright (c) 2000, 2012, 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_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;

    static jfieldID ia_preferIPv6AddressID;

    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_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 (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(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, "Native 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)->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)->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);

    }

    freeaddrinfo(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];

    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(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;