| /* |
| * Copyright (c) 2000, 2018, 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 <malloc.h> |
| |
| #include "net_util.h" |
| |
| #include "java_net_InetAddress.h" |
| #include "java_net_Inet4AddressImpl.h" |
| |
| /* |
| * Inet4AddressImpl |
| */ |
| |
| /* |
| * Class: java_net_Inet4AddressImpl |
| * Method: getLocalHostName |
| * Signature: ()Ljava/lang/String; |
| */ |
| JNIEXPORT jstring JNICALL |
| Java_java_net_Inet4AddressImpl_getLocalHostName(JNIEnv *env, jobject this) { |
| char hostname[256]; |
| |
| if (gethostname(hostname, sizeof(hostname)) == -1) { |
| strcpy(hostname, "localhost"); |
| } |
| return JNU_NewStringPlatform(env, hostname); |
| } |
| |
| /* |
| * 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 be a %d.%d.%d.%d string. The only |
| * exception should be when any of the %d are out of range and |
| * we fallback to a lookup. |
| * |
| * Class: java_net_Inet4AddressImpl |
| * Method: lookupAllHostAddr |
| * Signature: (Ljava/lang/String;)[[B |
| */ |
| JNIEXPORT jobjectArray JNICALL |
| Java_java_net_Inet4AddressImpl_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_INET; |
| |
| error = getaddrinfo(hostname, NULL, &hints, &res); |
| |
| if (error) { |
| // report error |
| NET_ThrowByNameWithLastError(env, "java/net/UnknownHostException", |
| hostname); |
| goto cleanupAndReturn; |
| } else { |
| int i = 0; |
| iterator = res; |
| while (iterator != NULL) { |
| // skip duplicates |
| int skip = 0; |
| struct addrinfo *iteratorNew = resNew; |
| while (iteratorNew != NULL) { |
| 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; |
| } |
| 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++; |
| } |
| 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)) { |
| goto cleanupAndReturn; |
| } |
| |
| i = 0; |
| iterator = resNew; |
| while (iterator != NULL) { |
| 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, i++, iaObj); |
| 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_Inet4AddressImpl |
| * Method: getHostByAddr |
| * Signature: (I)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_Inet4AddressImpl_getHostByAddr(JNIEnv *env, jobject this, |
| jbyteArray addrArray) { |
| jstring ret = NULL; |
| char host[NI_MAXHOST + 1]; |
| jbyte caddr[4]; |
| jint addr; |
| struct sockaddr_in sa; |
| |
| // construct a sockaddr_in structure |
| memset((char *)&sa, 0, sizeof(struct sockaddr_in)); |
| (*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.sin_addr.s_addr = htonl(addr); |
| sa.sin_family = AF_INET; |
| |
| if (getnameinfo((struct sockaddr *)&sa, sizeof(struct sockaddr_in), |
| host, NI_MAXHOST, 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_ping4(JNIEnv *env, SOCKETADDRESS *sa, SOCKETADDRESS *netif, jint timeout, |
| jint ttl) |
| { |
| jint fd; |
| int connect_rv = -1; |
| WSAEVENT hEvent; |
| |
| // open a TCP socket |
| fd = NET_Socket(AF_INET, SOCK_STREAM, 0); |
| if (fd == SOCKET_ERROR) { |
| // 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, WSAGetLastError(), "Can't create socket"); |
| return JNI_FALSE; |
| } |
| |
| // set TTL |
| if (ttl > 0) { |
| setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *)&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_in)) < 0) { |
| NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); |
| closesocket(fd); |
| return JNI_FALSE; |
| } |
| } |
| |
| // Make the socket non blocking so we can use select/poll. |
| hEvent = WSACreateEvent(); |
| WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); |
| |
| sa->sa4.sin_port = htons(7); // echo port |
| connect_rv = connect(fd, &sa->sa, sizeof(struct sockaddr_in)); |
| |
| // 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; |
| } |
| |
| 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; |
| case WSAEWOULDBLOCK: // this is expected as we'll probably have to wait |
| break; |
| default: |
| 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) { |
| // connection has been established, check for error condition |
| int 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); |
| return JNI_FALSE; |
| } |
| |
| /** |
| * 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 |
| ping4(JNIEnv *env, HANDLE hIcmpFile, SOCKETADDRESS *sa, |
| SOCKETADDRESS *netif, jint timeout) |
| { |
| DWORD dwRetVal = 0; |
| char SendData[32] = {0}; |
| LPVOID ReplyBuffer = NULL; |
| DWORD ReplySize = 0; |
| jboolean ret = JNI_FALSE; |
| |
| // See https://msdn.microsoft.com/en-us/library/aa366050%28VS.85%29.aspx |
| // or https://msdn.microsoft.com/en-us/library/windows/desktop/aa366051%28v=vs.85%29.aspx |
| ReplySize = sizeof(ICMP_ECHO_REPLY) // The buffer should be large enough |
| // to hold at least one ICMP_ECHO_REPLY |
| // structure |
| + sizeof(SendData) // plus RequestSize bytes of data. |
| + 8; // This buffer should also be large enough |
| // to also hold 8 more bytes of data |
| // (the size of an ICMP error message) |
| |
| ReplyBuffer = (VOID *)malloc(ReplySize); |
| if (ReplyBuffer == NULL) { |
| IcmpCloseHandle(hIcmpFile); |
| NET_ThrowNew(env, -1, "Unable to allocate memory"); |
| return JNI_FALSE; |
| } |
| |
| if (netif == NULL) { |
| dwRetVal = IcmpSendEcho(hIcmpFile, // HANDLE IcmpHandle, |
| sa->sa4.sin_addr.s_addr, // IPAddr DestinationAddress, |
| SendData, // LPVOID RequestData, |
| sizeof(SendData), // WORD RequestSize, |
| NULL, // PIP_OPTION_INFORMATION RequestOptions, |
| ReplyBuffer,// LPVOID ReplyBuffer, |
| ReplySize, // DWORD ReplySize, |
| // Note: IcmpSendEcho and its derivatives |
| // seem to have an undocumented minimum |
| // timeout of 1000ms below which the |
| // api behaves inconsistently. |
| (timeout < 1000) ? 1000 : timeout); // DWORD Timeout |
| } else { |
| dwRetVal = IcmpSendEcho2Ex(hIcmpFile, // HANDLE IcmpHandle, |
| NULL, // HANDLE Event |
| NULL, // PIO_APC_ROUTINE ApcRoutine |
| NULL, // ApcContext |
| netif->sa4.sin_addr.s_addr, // IPAddr SourceAddress, |
| sa->sa4.sin_addr.s_addr, // IPAddr DestinationAddress, |
| SendData, // LPVOID RequestData, |
| sizeof(SendData), // WORD RequestSize, |
| NULL, // PIP_OPTION_INFORMATION RequestOptions, |
| ReplyBuffer,// LPVOID ReplyBuffer, |
| ReplySize, // DWORD ReplySize, |
| (timeout < 1000) ? 1000 : timeout); // DWORD Timeout |
| } |
| |
| if (dwRetVal == 0) { // if the call failed |
| TCHAR *buf; |
| DWORD err = WSAGetLastError(); |
| switch (err) { |
| case ERROR_NO_NETWORK: |
| case ERROR_NETWORK_UNREACHABLE: |
| case ERROR_HOST_UNREACHABLE: |
| case ERROR_PROTOCOL_UNREACHABLE: |
| case ERROR_PORT_UNREACHABLE: |
| case ERROR_REQUEST_ABORTED: |
| case ERROR_INCORRECT_ADDRESS: |
| case ERROR_HOST_DOWN: |
| case ERROR_INVALID_COMPUTERNAME: |
| case ERROR_INVALID_NETNAME: |
| case WSAEHOSTUNREACH: /* Host Unreachable */ |
| case WSAENETUNREACH: /* Network Unreachable */ |
| case WSAENETDOWN: /* Network is down */ |
| case WSAEPFNOSUPPORT: /* Protocol Family unsupported */ |
| case IP_REQ_TIMED_OUT: |
| break; |
| default: |
| FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, |
| NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
| (LPTSTR)&buf, 0, NULL); |
| NET_ThrowNew(env, err, buf); |
| LocalFree(buf); |
| break; |
| } |
| } else { |
| PICMP_ECHO_REPLY pEchoReply = (PICMP_ECHO_REPLY)ReplyBuffer; |
| |
| // This is to take into account the undocumented minimum |
| // timeout mentioned in the IcmpSendEcho call above. |
| // We perform an extra check to make sure that our |
| // roundtrip time was less than our desired timeout |
| // for cases where that timeout is < 1000ms. |
| if (pEchoReply->Status == IP_SUCCESS && |
| (int)pEchoReply->RoundTripTime <= timeout) |
| { |
| ret = JNI_TRUE; |
| } |
| } |
| |
| free(ReplyBuffer); |
| IcmpCloseHandle(hIcmpFile); |
| |
| return ret; |
| } |
| |
| /* |
| * Class: java_net_Inet4AddressImpl |
| * Method: isReachable0 |
| * Signature: ([bI[bI)Z |
| */ |
| JNIEXPORT jboolean JNICALL |
| Java_java_net_Inet4AddressImpl_isReachable0(JNIEnv *env, jobject this, |
| jbyteArray addrArray, jint timeout, |
| jbyteArray ifArray, jint ttl) |
| { |
| jbyte caddr[4]; |
| jint addr = 0, sz; |
| SOCKETADDRESS sa, inf, *netif = NULL; |
| HANDLE hIcmpFile; |
| |
| // check if address array size is 4 (IPv4 address) |
| sz = (*env)->GetArrayLength(env, addrArray); |
| if (sz != 4) { |
| return JNI_FALSE; |
| } |
| |
| // convert IP address from byte array to integer |
| memset((char *)caddr, 0, sizeof(caddr)); |
| (*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 *)&sa, 0, sizeof(SOCKETADDRESS)); |
| sa.sa4.sin_addr.s_addr = htonl(addr); |
| sa.sa4.sin_family = AF_INET; |
| |
| // If a network interface was specified, let's convert its address as well. |
| if (!(IS_NULL(ifArray))) { |
| memset((char *)caddr, 0, sizeof(caddr)); |
| (*env)->GetByteArrayRegion(env, ifArray, 0, 4, caddr); |
| addr = ((caddr[0] << 24) & 0xff000000); |
| addr |= ((caddr[1] << 16) & 0xff0000); |
| addr |= ((caddr[2] << 8) & 0xff00); |
| addr |= (caddr[3] & 0xff); |
| memset((char *)&inf, 0, sizeof(SOCKETADDRESS)); |
| inf.sa4.sin_addr.s_addr = htonl(addr); |
| inf.sa4.sin_family = AF_INET; |
| netif = &inf; |
| } |
| |
| // Let's try to create an ICMP handle. |
| hIcmpFile = IcmpCreateFile(); |
| if (hIcmpFile == INVALID_HANDLE_VALUE) { |
| int err = WSAGetLastError(); |
| if (err == ERROR_ACCESS_DENIED) { |
| // fall back to TCP echo if access is denied to ICMP |
| return tcp_ping4(env, &sa, netif, timeout, ttl); |
| } else { |
| NET_ThrowNew(env, err, "Unable to create ICMP file handle"); |
| return JNI_FALSE; |
| } |
| } else { |
| // It didn't fail, so we can use ICMP. |
| return ping4(env, hIcmpFile, &sa, netif, timeout); |
| } |
| } |
