/* * Copyright (c) 2000, 2020, 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 #if defined(_ALLBSD_SOURCE) #include #include #endif #include "net_util.h" #include "java_net_InetAddress.h" #include "java_net_Inet4AddressImpl.h" #include "java_net_Inet6AddressImpl.h" #define SET_NONBLOCKING(fd) { \ int flags = fcntl(fd, F_GETFL); \ flags |= O_NONBLOCK; \ fcntl(fd, F_SETFL, flags); \ } /* * 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 (gethostname(hostname, sizeof(hostname)) != 0) { strcpy(hostname, "localhost"); } else { // make sure string is null-terminated hostname[NI_MAXHOST] = '\0'; } return (*env)->NewStringUTF(env, hostname); } #if defined(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; initInetAddressIDs(env); JNU_CHECK_EXCEPTION_RETURN(env, 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 (gethostname(myhostname, sizeof(myhostname)) == -1) { /* 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) { if (iter->ifa_addr != NULL) { int family = iter->ifa_addr->sa_family; if (iter->ifa_name[0] != '\0') { 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, ia_class, NULL); if (!result) goto done; if ((*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID)) { 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) { if (iter->ifa_addr != NULL) { jboolean isLoopback = iter->ifa_flags & IFF_LOOPBACK; int family = iter->ifa_addr->sa_family; if (iter->ifa_name[0] != '\0' && (family == AF_INET || (family == AF_INET6 && includeV6)) && (!isLoopback || includeLoopback)) { int port; int index = (family == AF_INET) ? i++ : j++; jobject o = NET_SockaddrToInetAddress(env, (SOCKETADDRESS *)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); if ((*env)->ExceptionCheck(env)) goto done; (*env)->SetObjectArrayElement(env, result, index, o); (*env)->DeleteLocalRef(env, o); } } iter = iter->ifa_next; } done: freeifaddrs(ifa); return result; } #endif /* * 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) { jobjectArray ret = NULL; const char *hostname; int error = 0; struct addrinfo hints, *res = NULL, *resNew = NULL, *last = NULL, *iterator; initInetAddressIDs(env); JNU_CHECK_EXCEPTION_RETURN(env, NULL); if (IS_NULL(host)) { JNU_ThrowNullPointerException(env, "host argument is null"); return NULL; } hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE); CHECK_NULL_RETURN(hostname, NULL); // 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 defined(MACOSX) // if getaddrinfo fails try getifaddrs ret = lookupIfLocalhost(env, hostname, JNI_TRUE); if (ret != NULL || (*env)->ExceptionCheck(env)) { goto cleanupAndReturn; } #endif // report error NET_ThrowUnknownHostExceptionWithGaiError(env, hostname, error); goto cleanupAndReturn; } else { int i = 0, inetCount = 0, inet6Count = 0, inetIndex = 0, inet6Index = 0, originalIndex = 0; int addressPreference = (*env)->GetStaticIntField(env, ia_class, ia_preferIPv6AddressID);; iterator = res; while (iterator != NULL) { // skip duplicates int skip = 0; struct addrinfo *iteratorNew = resNew; while (iteratorNew != NULL) { if (iterator->ai_family == iteratorNew->ai_family && iterator->ai_addrlen == iteratorNew->ai_addrlen) { if (iteratorNew->ai_family == AF_INET) { /* AF_INET */ struct sockaddr_in *addr1, *addr2; addr1 = (struct sockaddr_in *)iterator->ai_addr; addr2 = (struct sockaddr_in *)iteratorNew->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 *)iteratorNew->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) { iteratorNew = iteratorNew->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; } iteratorNew = iteratorNew->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; } // allocate array - at this point i contains the number of addresses ret = (*env)->NewObjectArray(env, i, ia_class, NULL); if (IS_NULL(ret)) { /* we may have memory to free at the end of this */ goto cleanupAndReturn; } if (addressPreference == java_net_InetAddress_PREFER_IPV6_VALUE) { inetIndex = inet6Count; inet6Index = 0; } else if (addressPreference == java_net_InetAddress_PREFER_IPV4_VALUE) { inetIndex = 0; inet6Index = inetCount; } else if (addressPreference == java_net_InetAddress_PREFER_SYSTEM_VALUE) { inetIndex = inet6Index = originalIndex = 0; } iterator = resNew; while (iterator != NULL) { if (iterator->ai_family == AF_INET) { jobject iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID); if (IS_NULL(iaObj)) { ret = NULL; goto cleanupAndReturn; } setInetAddress_addr(env, iaObj, ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr)); if ((*env)->ExceptionCheck(env)) goto cleanupAndReturn; setInetAddress_hostName(env, iaObj, host); if ((*env)->ExceptionCheck(env)) goto cleanupAndReturn; (*env)->SetObjectArrayElement(env, ret, (inetIndex | originalIndex), iaObj); inetIndex++; } else if (iterator->ai_family == AF_INET6) { jint scope = 0; jboolean ret1; jobject iaObj = (*env)->NewObject(env, ia6_class, ia6_ctrID); if (IS_NULL(iaObj)) { ret = NULL; goto cleanupAndReturn; } ret1 = setInet6Address_ipaddress(env, iaObj, (char *)&(((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); if ((*env)->ExceptionCheck(env)) goto cleanupAndReturn; (*env)->SetObjectArrayElement(env, ret, (inet6Index | originalIndex), iaObj); inet6Index++; } if (addressPreference == java_net_InetAddress_PREFER_SYSTEM_VALUE) { originalIndex++; inetIndex = inet6Index = 0; } iterator = iterator->ai_next; } } cleanupAndReturn: JNU_ReleaseStringPlatformChars(env, host, hostname); while (resNew != NULL) { last = resNew; resNew = resNew->ai_next; free(last); } if (res != NULL) { freeaddrinfo(res); } return ret; } /* * Class: java_net_Inet6AddressImpl * Method: getHostByAddr * Signature: ([B)Ljava/lang/String; * * Theoretically the UnknownHostException could be enriched with gai error * information. But as it is silently ignored anyway, there's no need for this. * It's only important that either a valid hostname is returned or an * UnknownHostException is thrown. */ JNIEXPORT jstring JNICALL Java_java_net_Inet6AddressImpl_getHostByAddr(JNIEnv *env, jobject this, jbyteArray addrArray) { jstring ret = NULL; char host[NI_MAXHOST + 1]; int len = 0; jbyte caddr[16]; SOCKETADDRESS sa; memset((void *)&sa, 0, sizeof(SOCKETADDRESS)); // construct a sockaddr_in structure (AF_INET or AF_INET6) 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); sa.sa4.sin_addr.s_addr = htonl(addr); sa.sa4.sin_family = AF_INET; len = sizeof(struct sockaddr_in); } else { (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr); memcpy((void *)&sa.sa6.sin6_addr, caddr, sizeof(struct in6_addr)); sa.sa6.sin6_family = AF_INET6; len = sizeof(struct sockaddr_in6); } if (getnameinfo(&sa.sa, len, host, sizeof(host), NULL, 0, NI_NAMEREQD)) { JNU_ThrowByName(env, "java/net/UnknownHostException", NULL); } else { ret = (*env)->NewStringUTF(env, host); if (ret == NULL) { JNU_ThrowByName(env, "java/net/UnknownHostException", NULL); } } return ret; } /** * ping implementation using tcp port 7 (echo) */ static jboolean tcp_ping6(JNIEnv *env, SOCKETADDRESS *sa, SOCKETADDRESS *netif, jint timeout, jint ttl) { jint fd; int connect_rv = -1; // open a TCP socket fd = socket(AF_INET6, SOCK_STREAM, 0); if (fd == -1) { // 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; } // set TTL 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, &netif->sa, sizeof(struct sockaddr_in6)) <0) { NET_ThrowNew(env, errno, "Can't bind socket"); close(fd); return JNI_FALSE; } } // Make the socket non blocking so we can use select/poll. SET_NONBLOCKING(fd); sa->sa6.sin6_port = htons(7); // echo port connect_rv = NET_Connect(fd, &sa->sa, sizeof(struct sockaddr_in6)); // 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; } switch (errno) { case ENETUNREACH: // Network Unreachable case EAFNOSUPPORT: // Address Family not supported case EADDRNOTAVAIL: // address is not available on the remote machine #if defined(__linux__) || defined(_AIX) // 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. case EINVAL: case EHOSTUNREACH: // No route to host #endif close(fd); return JNI_FALSE; case EINPROGRESS: // this is expected as we'll probably have to wait break; default: 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) { // connection has been established, check for error condition socklen_t optlen = (socklen_t)sizeof(connect_rv); if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv, &optlen) <0) { connect_rv = errno; } if (connect_rv == 0 || connect_rv == ECONNREFUSED) { close(fd); return JNI_TRUE; } } close(fd); return JNI_FALSE; } /** * ping implementation. * Send an ICMP_ECHO_REQUEST packet every second until either the timeout * expires or an answer is received. * Returns true if an ECHO_REPLY is received, false otherwise. */ static jboolean ping6(JNIEnv *env, jint fd, SOCKETADDRESS *sa, SOCKETADDRESS *netif, jint timeout, jint ttl) { jint n, size = 60 * 1024, tmout2, seq = 1; socklen_t len; unsigned char sendbuf[1500], recvbuf[1500]; struct icmp6_hdr *icmp6; struct sockaddr_in6 sa_recv; jchar pid; struct timeval tv; size_t plen = sizeof(struct icmp6_hdr) + sizeof(tv); #if defined(__linux__) /** * For some strange reason, the linux kernel won't calculate the * checksum of ICMPv6 packets unless you set this socket option */ int csum_offset = 2; setsockopt(fd, SOL_RAW, IPV6_CHECKSUM, &csum_offset, sizeof(int)); #endif setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); // sets the ttl (max number of hops) if (ttl > 0) { setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)); } // a specific interface was specified, so let's bind the socket // to that interface to ensure the requests are sent only through it. if (netif != NULL) { if (bind(fd, &netif->sa, sizeof(struct sockaddr_in6)) <0) { NET_ThrowNew(env, errno, "Can't bind socket"); close(fd); return JNI_FALSE; } } // icmp_id is a 16 bit data type, therefore down cast the pid pid = (jchar)getpid(); // Make the socket non blocking so we can use select SET_NONBLOCKING(fd); do { // create the ICMP request 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++; gettimeofday(&tv, NULL); memcpy(sendbuf + sizeof(struct icmp6_hdr), &tv, sizeof(tv)); icmp6->icmp6_cksum = 0; // send it n = sendto(fd, sendbuf, plen, 0, &sa->sa, sizeof(struct sockaddr_in6)); if (n < 0 && errno != EINPROGRESS) { #if defined(__linux__) /* * 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. */ if (errno != EINVAL && errno != EHOSTUNREACH) { NET_ThrowNew(env, errno, "Can't send ICMP packet"); } #else NET_ThrowNew(env, errno, "Can't send ICMP packet"); #endif 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); // check if we received enough data if (n < (jint)sizeof(struct icmp6_hdr)) { continue; } icmp6 = (struct icmp6_hdr *)recvbuf; // 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 (icmp6->icmp6_type == ICMP6_ECHO_REPLY && (ntohs(icmp6->icmp6_id) == pid)) { if (NET_IsEqual((jbyte *)&sa->sa6.sin6_addr, (jbyte *)&sa_recv.sin6_addr)) { close(fd); return JNI_TRUE; } else if (NET_IsZeroAddr((jbyte *)&sa->sa6.sin6_addr)) { close(fd); return JNI_TRUE; } } } } while (tmout2 > 0); timeout -= 1000; } while (timeout > 0); close(fd); return JNI_FALSE; } /* * Class: java_net_Inet6AddressImpl * Method: isReachable0 * Signature: ([BII[BII)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) { jbyte caddr[16]; jint sz, fd; SOCKETADDRESS sa, inf, *netif = NULL; // If IPv6 is not enabled, 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); } // load address to SOCKETADDRESS memset((char *)caddr, 0, 16); (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr); memset((char *)&sa, 0, sizeof(SOCKETADDRESS)); memcpy((void *)&sa.sa6.sin6_addr, caddr, sizeof(struct in6_addr)); sa.sa6.sin6_family = AF_INET6; if (scope > 0) { sa.sa6.sin6_scope_id = scope; } // load network interface address to SOCKETADDRESS, if specified if (!(IS_NULL(ifArray))) { memset((char *)caddr, 0, 16); (*env)->GetByteArrayRegion(env, ifArray, 0, 16, caddr); memset((char *)&inf, 0, sizeof(SOCKETADDRESS)); memcpy((void *)&inf.sa6.sin6_addr, caddr, sizeof(struct in6_addr)); inf.sa6.sin6_family = AF_INET6; inf.sa6.sin6_scope_id = if_scope; netif = &inf; } // Let's try to create a RAW socket to send ICMP packets. // This usually requires "root" privileges, so it's likely to fail. fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); if (fd == -1) { return tcp_ping6(env, &sa, netif, timeout, ttl); } else { // It didn't fail, so we can use ICMP_ECHO requests. return ping6(env, fd, &sa, netif, timeout, ttl); } }