Java example source code file (Inet6AddressImpl.c)
The Inet6AddressImpl.c Java example source code/*
* Copyright (c) 2000, 2013, 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 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");
CHECK_NULL_RETURN(ni_iacls, NULL);
ni_iacls = (*env)->NewGlobalRef(env, ni_iacls);
CHECK_NULL_RETURN(ni_iacls, NULL);
ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address");
CHECK_NULL_RETURN(ni_ia4cls, NULL);
ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls);
CHECK_NULL_RETURN(ni_ia4cls, NULL);
ni_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");
CHECK_NULL_RETURN(ni_ia6cls, NULL);
ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);
CHECK_NULL_RETURN(ni_ia6cls, NULL);
ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");
CHECK_NULL_RETURN(ni_ia4ctrID, NULL);
ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<init>", "()V");
CHECK_NULL_RETURN(ni_ia6ctrID, NULL);
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) {
if (WSAGetLastError() == WSATRY_AGAIN) {
NET_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "UnknownHostException",
hostname);
JNU_ReleaseStringPlatformChars(env, host, hostname);
return NULL;
} else {
/* 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;
}
setInetAddress_addr(env, iaObj, ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));
setInetAddress_hostName(env, iaObj, host);
(*env)->SetObjectArrayElement(env, ret, inetIndex, iaObj);
inetIndex ++;
} else if (iterator->ai_family == AF_INET6) {
jint scope = 0, ret1;
jobject iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);
if (IS_NULL(iaObj)) {
ret = NULL;
goto cleanupAndReturn;
}
ret1 = setInet6Address_ipaddress(env, iaObj, (jbyte *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));
if (ret1 == JNI_FALSE) {
ret = NULL;
goto cleanupAndReturn;
}
scope = ((struct sockaddr_in6*)iterator->ai_addr)->sin6_scope_id;
if (scope != 0) { /* zero is default value, no need to set */
setInet6Address_scopeid(env, iaObj, scope);
}
setInetAddress_hostName(env, iaObj, 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);
}
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), ×tamp, 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 (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;
}
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