/* * 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 #include #include #include #include #include #include #include #include #include #ifdef MACOSX #include #include #include /* gethostname */ #endif #include "jvm.h" #include "jni_util.h" #include "net_util.h" #ifndef IPV6_DEFS_H #include #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, "", "()V"); CHECK_NULL_RETURN(ni_ia4ctrID, JNI_FALSE); ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "", "()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); if (name == NULL) { freeifaddrs(ifa); return NULL; } /* 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 */ }