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 <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef MACOSX
#include <ifaddrs.h>
#include <net/if.h>
#include <unistd.h> /* gethostname */
#endif
#include "jvm.h"
#include "jni_util.h"
#include "net_util.h"
#ifndef IPV6_DEFS_H
#include <netinet/icmp6.h>
#endif
#include "java_net_Inet4AddressImpl.h"
#include "java_net_Inet6AddressImpl.h"
/* the initial size of our hostent buffers */
#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#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[NI_MAXHOST+1];
hostname[0] = '\0';
if (JVM_GetHostName(hostname, sizeof(hostname))) {
/* Something went wrong, maybe networking is not setup? */
strcpy(hostname, "localhost");
} else {
// ensure null-terminated
hostname[NI_MAXHOST] = '\0';
#if defined(__linux__) || defined(_ALLBSD_SOURCE)
/* On Linux/FreeBSD gethostname() says "host.domain.sun.com". On
* Solaris gethostname() says "host", so extra work is needed.
*/
#else
/* Solaris doesn't want to give us a fully qualified domain name.
* We do a reverse lookup to try and get one. This works
* if DNS occurs before NIS in /etc/resolv.conf, but fails
* if NIS comes first (it still gets only a partial name).
* We use thread-safe system calls.
*/
#ifdef AF_INET6
struct addrinfo hints, *res;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_UNSPEC;
error = getaddrinfo(hostname, NULL, &hints, &res);
if (error == 0) {
/* host is known to name service */
error = getnameinfo(res->ai_addr,
res->ai_addrlen,
hostname,
NI_MAXHOST,
NULL,
0,
NI_NAMEREQD);
/* if getnameinfo fails hostname is still the value
from gethostname */
freeaddrinfo(res);
}
#endif /* AF_INET6 */
#endif /* __linux__ || _ALLBSD_SOURCE */
}
return (*env)->NewStringUTF(env, hostname);
}
static jclass ni_iacls;
static jclass ni_ia4cls;
static jclass ni_ia6cls;
static jmethodID ni_ia4ctrID;
static jmethodID ni_ia6ctrID;
static jboolean preferIPv6Address;
static jboolean initializeInetClasses(JNIEnv *env)
{
jfieldID ni_preferIPv6AddressID;
static int initialized = 0;
if (!initialized) {
ni_iacls = (*env)->FindClass(env, "java/net/InetAddress");
CHECK_NULL_RETURN(ni_iacls, JNI_FALSE);
ni_iacls = (*env)->NewGlobalRef(env, ni_iacls);
CHECK_NULL_RETURN(ni_iacls, JNI_FALSE);
ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address");
CHECK_NULL_RETURN(ni_ia4cls, JNI_FALSE);
ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls);
CHECK_NULL_RETURN(ni_ia4cls, JNI_FALSE);
ni_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");
CHECK_NULL_RETURN(ni_ia6cls, JNI_FALSE);
ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);
CHECK_NULL_RETURN(ni_ia6cls, JNI_FALSE);
ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");
CHECK_NULL_RETURN(ni_ia4ctrID, JNI_FALSE);
ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<init>", "()V");
CHECK_NULL_RETURN(ni_ia6ctrID, JNI_FALSE);
ni_preferIPv6AddressID =
(*env)->GetStaticFieldID(env, ni_iacls, "preferIPv6Address", "Z");
CHECK_NULL_RETURN(ni_preferIPv6AddressID, JNI_FALSE);
preferIPv6Address =
(*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID);
initialized = 1;
}
return JNI_TRUE;
}
#ifdef MACOSX
/* also called from Inet4AddressImpl.c */
__private_extern__ jobjectArray
lookupIfLocalhost(JNIEnv *env, const char *hostname, jboolean includeV6)
{
jobjectArray result = NULL;
char myhostname[NI_MAXHOST+1];
struct ifaddrs *ifa = NULL;
int familyOrder = 0;
int count = 0, i, j;
int addrs4 = 0, addrs6 = 0, numV4Loopbacks = 0, numV6Loopbacks = 0;
jboolean includeLoopback = JNI_FALSE;
jobject name;
// Make sure static variables we need are set.
if (!initializeInetClasses(env))
return NULL;
/* If the requested name matches this host's hostname, return IP addresses
* from all attached interfaces. (#2844683 et al) This prevents undesired
* PPP dialup, but may return addresses that don't actually correspond to
* the name (if the name actually matches something in DNS etc.
*/
myhostname[0] = '\0';
if (JVM_GetHostName(myhostname, NI_MAXHOST)) {
/* Something went wrong, maybe networking is not setup? */
return NULL;
}
myhostname[NI_MAXHOST] = '\0';
if (strcmp(myhostname, hostname) != 0) {
// Non-self lookup
return NULL;
}
if (getifaddrs(&ifa) != 0) {
NET_ThrowNew(env, errno, "Can't get local interface addresses");
return NULL;
}
name = (*env)->NewStringUTF(env, hostname);
/* Iterate over the interfaces, and total up the number of IPv4 and IPv6
* addresses we have. Also keep a count of loopback addresses. We need to
* exclude them in the normal case, but return them if we don't get an IP
* address.
*/
struct ifaddrs *iter = ifa;
while (iter) {
int family = iter->ifa_addr->sa_family;
if (iter->ifa_name[0] != '\0' && iter->ifa_addr)
{
jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK;
if (family == AF_INET) {
addrs4++;
if (isLoopback) numV4Loopbacks++;
} else if (family == AF_INET6 && includeV6) {
addrs6++;
if (isLoopback) numV6Loopbacks++;
} else {
/* We don't care e.g. AF_LINK */
}
}
iter = iter->ifa_next;
}
if (addrs4 == numV4Loopbacks && addrs6 == numV6Loopbacks) {
// We don't have a real IP address, just loopback. We need to include
// loopback in our results.
includeLoopback = JNI_TRUE;
}
/* Create and fill the Java array. */
int arraySize = addrs4 + addrs6 -
(includeLoopback ? 0 : (numV4Loopbacks + numV6Loopbacks));
result = (*env)->NewObjectArray(env, arraySize, ni_iacls, NULL);
if (!result) goto done;
if (preferIPv6Address) {
i = includeLoopback ? addrs6 : (addrs6 - numV6Loopbacks);
j = 0;
} else {
i = 0;
j = includeLoopback ? addrs4 : (addrs4 - numV4Loopbacks);
}
// Now loop around the ifaddrs
iter = ifa;
while (iter != NULL) {
jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK;
int family = iter->ifa_addr->sa_family;
if (iter->ifa_name[0] != '\0' && iter->ifa_addr
&& (family == AF_INET || (family == AF_INET6 && includeV6))
&& (!isLoopback || includeLoopback))
{
int port;
int index = (family == AF_INET) ? i++ : j++;
jobject o = NET_SockaddrToInetAddress(env, iter->ifa_addr, &port);
if (!o) {
freeifaddrs(ifa);
if (!(*env)->ExceptionCheck(env))
JNU_ThrowOutOfMemoryError(env, "Object allocation failed");
return NULL;
}
setInetAddress_hostName(env, o, name);
(*env)->SetObjectArrayElement(env, result, index, o);
(*env)->DeleteLocalRef(env, o);
}
iter = iter->ifa_next;
}
done:
freeifaddrs(ifa);
return result;
}
#endif
/*
* Find an internet address for a given hostname. Note that this
* code only works for addresses of type INET. The translation
* of %d.%d.%d.%d to an address (int) occurs in java now, so the
* String "host" shouldn't *ever* be a %d.%d.%d.%d string
*
* Class: java_net_Inet6AddressImpl
* Method: lookupAllHostAddr
* Signature: (Ljava/lang/String;)[[B
*/
JNIEXPORT jobjectArray JNICALL
Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
jstring host) {
const char *hostname;
jobjectArray ret = 0;
int retLen = 0;
int error=0;
#ifdef AF_INET6
struct addrinfo hints, *res, *resNew = NULL;
#endif /* AF_INET6 */
if (!initializeInetClasses(env))
return NULL;
if (IS_NULL(host)) {
JNU_ThrowNullPointerException(env, "host is null");
return 0;
}
hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE);
CHECK_NULL_RETURN(hostname, NULL);
#ifdef MACOSX
/*
* If we're looking up the local machine, attempt to get the address
* from getifaddrs. This ensures we get an IPv6 address for the local
* machine.
*/
ret = lookupIfLocalhost(env, hostname, JNI_TRUE);
if (ret != NULL || (*env)->ExceptionCheck(env)) {
JNU_ReleaseStringPlatformChars(env, host, hostname);
return ret;
}
#endif
#ifdef AF_INET6
/* Try once, with our static buffer. */
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_UNSPEC;
#ifdef __solaris__
/*
* Workaround for Solaris bug 4160367 - if a hostname contains a
* white space then 0.0.0.0 is returned
*/
if (isspace((unsigned char)hostname[0])) {
JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException",
hostname);
JNU_ReleaseStringPlatformChars(env, host, hostname);
return NULL;
}
#endif
error = getaddrinfo(hostname, NULL, &hints, &res);
if (error) {
/* report error */
ThrowUnknownHostExceptionWithGaiError(env, hostname, error);
JNU_ReleaseStringPlatformChars(env, host, hostname);
return NULL;
} else {
int i = 0;
int inetCount = 0, inet6Count = 0, inetIndex, inet6Index;
struct addrinfo *itr, *last = NULL, *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;
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) {
/* AF_INET addresses will be offset by inet6Count */
inetIndex = inet6Count;
inet6Index = 0;
} else {
/* AF_INET6 addresses will be offset by inetCount */
inetIndex = 0;
inet6Index = inetCount;
}
while (iterator != NULL) {
int ret1;
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;
jobject iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);
if (IS_NULL(iaObj)) {
ret = NULL;
goto cleanupAndReturn;
}
ret1 = setInet6Address_ipaddress(env, iaObj, (char *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));
if (!ret1) {
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);
#endif /* AF_INET6 */
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;
#ifdef AF_INET6
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((void *) &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((void *) &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);
}
#endif /* AF_INET6 */
if (ret == NULL) {
JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL);
}
return ret;
}
#define SET_NONBLOCKING(fd) { \
int flags = fcntl(fd, F_GETFL); \
flags |= O_NONBLOCK; \
fcntl(fd, F_SETFL, flags); \
}
#ifdef AF_INET6
static jboolean
ping6(JNIEnv *env, jint fd, struct sockaddr_in6* him, jint timeout,
struct sockaddr_in6* netif, jint ttl) {
jint size;
jint n;
socklen_t len;
char sendbuf[1500];
unsigned char recvbuf[1500];
struct icmp6_hdr *icmp6;
struct sockaddr_in6 sa_recv;
jbyte *caddr, *recv_caddr;
jchar pid;
jint tmout2, seq = 1;
struct timeval tv;
size_t plen;
#ifdef __linux__
{
int csum_offset;
/**
* For some strange reason, the linux kernel won't calculate the
* checksum of ICMPv6 packets unless you set this socket option
*/
csum_offset = 2;
setsockopt(fd, SOL_RAW, IPV6_CHECKSUM, &csum_offset, sizeof(int));
}
#endif
caddr = (jbyte *)&(him->sin6_addr);
/* icmp_id is a 16 bit data type, therefore down cast the pid */
pid = (jchar)getpid();
size = 60*1024;
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size));
if (ttl > 0) {
setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
}
if (netif != NULL) {
if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) {
NET_ThrowNew(env, errno, "Can't bind socket");
close(fd);
return JNI_FALSE;
}
}
SET_NONBLOCKING(fd);
do {
icmp6 = (struct icmp6_hdr *) sendbuf;
icmp6->icmp6_type = ICMP6_ECHO_REQUEST;
icmp6->icmp6_code = 0;
/* let's tag the ECHO packet with our pid so we can identify it */
icmp6->icmp6_id = htons(pid);
icmp6->icmp6_seq = htons(seq);
seq++;
icmp6->icmp6_cksum = 0;
gettimeofday(&tv, NULL);
memcpy(sendbuf + sizeof(struct icmp6_hdr), &tv, sizeof(tv));
plen = sizeof(struct icmp6_hdr) + sizeof(tv);
n = sendto(fd, sendbuf, plen, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6));
if (n < 0 && errno != EINPROGRESS) {
#ifdef __linux__
if (errno != EINVAL && errno != EHOSTUNREACH)
/*
* On some Linux versions, when a socket is bound to the
* loopback interface, sendto will fail and errno will be
* set to EINVAL or EHOSTUNREACH.
* When that happens, don't throw an exception, just return false.
*/
#endif /*__linux__ */
NET_ThrowNew(env, errno, "Can't send ICMP packet");
close(fd);
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);
n = recvfrom(fd, recvbuf, sizeof(recvbuf), 0, (struct sockaddr*) &sa_recv, &len);
icmp6 = (struct icmp6_hdr *) (recvbuf);
recv_caddr = (jbyte *)&(sa_recv.sin6_addr);
/*
* We did receive something, but is it what we were expecting?
* I.E.: An ICMP6_ECHO_REPLY packet with the proper PID and
* from the host that we are trying to determine is reachable.
*/
if (n >= 8 && icmp6->icmp6_type == ICMP6_ECHO_REPLY &&
(ntohs(icmp6->icmp6_id) == pid)) {
if (NET_IsEqual(caddr, recv_caddr)) {
close(fd);
return JNI_TRUE;
}
if (NET_IsZeroAddr(caddr)) {
close(fd);
return JNI_TRUE;
}
}
}
} while (tmout2 > 0);
timeout -= 1000;
} while (timeout > 0);
close(fd);
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 inf6;
struct sockaddr_in6* netif = NULL;
int len = 0;
int connect_rv = -1;
/*
* If IPv6 is not enable, then we can't reach an IPv6 address, can we?
*/
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((void *) caddr, 0, 16);
memset((void *) &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;
#ifdef __linux__
if (scope > 0)
him6.sin6_scope_id = scope;
else
him6.sin6_scope_id = getDefaultIPv6Interface( &(him6.sin6_addr));
len = sizeof(struct sockaddr_in6);
#else
if (scope > 0)
him6.sin6_scope_id = scope;
len = sizeof(struct sockaddr_in6);
#endif
/*
* If a network interface was specified, let's create the address
* for it.
*/
if (!(IS_NULL(ifArray))) {
memset((void *) caddr, 0, 16);
memset((void *) &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_scope_id = if_scope;
netif = &inf6;
}
/*
* 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 service has been disabled.
*/
fd = JVM_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);
}
/* No good, let's fall back on TCP */
fd = JVM_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;
}
if (ttl > 0) {
setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
}
/*
* A network interface was specified, so let's bind to it.
*/
if (netif != NULL) {
if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) {
NET_ThrowNew(env, errno, "Can't bind socket");
close(fd);
return JNI_FALSE;
}
}
SET_NONBLOCKING(fd);
/* no need to use NET_Connect as non-blocking */
him6.sin6_port = htons((short) 7); /* Echo port */
connect_rv = JVM_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 || errno == ECONNREFUSED) {
close(fd);
return JNI_TRUE;
} else {
int optlen;
switch (errno) {
case ENETUNREACH: /* Network Unreachable */
case EAFNOSUPPORT: /* Address Family not supported */
case EADDRNOTAVAIL: /* address is not available on the remote machine */
#ifdef __linux__
case EINVAL:
case EHOSTUNREACH:
/*
* On some Linux versions, when a socket is bound to the
* loopback interface, connect will fail and errno will
* be set to EINVAL or EHOSTUNREACH. When that happens,
* don't throw an exception, just return false.
*/
#endif /* __linux__ */
close(fd);
return JNI_FALSE;
}
if (errno != EINPROGRESS) {
NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException",
"connect failed");
close(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 = errno;
}
if (connect_rv == 0 || ECONNREFUSED) {
close(fd);
return JNI_TRUE;
}
}
close(fd);
return JNI_FALSE;
}
#else /* AF_INET6 */
return JNI_FALSE;
#endif /* AF_INET6 */
}
Other Java examples (source code examples)Here is a short list of links related to this Java Inet6AddressImpl.c source code file: |
The search page
Other Java source code examples at this package level
Click here to learn more about this project
