/* * 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 #include #include #include #include #include #include #include #include #include #include #include "java_net_InetAddress.h" #include "java_net_Inet4AddressImpl.h" #include "net_util.h" #include "icmp.h" /* * Returns true if hostname is in dotted IP address format. Note that this * function performs a syntax check only. For each octet it just checks that * the octet is at most 3 digits. */ jboolean isDottedIPAddress(const char *hostname, unsigned int *addrp) { char *c = (char *)hostname; int octets = 0; unsigned int cur = 0; int digit_cnt = 0; while (*c) { if (*c == '.') { if (digit_cnt == 0) { return JNI_FALSE; } else { if (octets < 4) { addrp[octets++] = cur; cur = 0; digit_cnt = 0; } else { return JNI_FALSE; } } c++; continue; } if ((*c < '0') || (*c > '9')) { return JNI_FALSE; } digit_cnt++; if (digit_cnt > 3) { return JNI_FALSE; } /* don't check if current octet > 255 */ cur = cur*10 + (*c - '0'); /* Move onto next character and check for EOF */ c++; if (*c == '\0') { if (octets < 4) { addrp[octets++] = cur; } else { return JNI_FALSE; } } } return (jboolean)(octets == 4); } /* * 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. Not this 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 * * This is almost shared code */ JNIEXPORT jobjectArray JNICALL Java_java_net_Inet4AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this, jstring host) { const char *hostname; struct hostent *hp; unsigned int addr[4]; jobjectArray ret = NULL; initInetAddressIDs(env); JNU_CHECK_EXCEPTION_RETURN(env, NULL); if (IS_NULL(host)) { JNU_ThrowNullPointerException(env, "host argument"); return NULL; } hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE); CHECK_NULL_RETURN(hostname, NULL); /* * The NT/2000 resolver tolerates a space in front of localhost. This * is not consistent with other implementations of gethostbyname. * In addition we must do a white space check on Solaris to avoid a * bug whereby 0.0.0.0 is returned if any host name has a white space. */ if (isspace(hostname[0])) { JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); goto cleanupAndReturn; } /* * If the format is x.x.x.x then don't use gethostbyname as Windows * is unable to handle octets which are out of range. */ if (isDottedIPAddress(hostname, &addr[0])) { unsigned int address; jobject iaObj; /* * Are any of the octets out of range? */ if (addr[0] > 255 || addr[1] > 255 || addr[2] > 255 || addr[3] > 255) { JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); goto cleanupAndReturn; } /* * Return an byte array with the populated address. */ address = (addr[3]<<24) & 0xff000000; address |= (addr[2]<<16) & 0xff0000; address |= (addr[1]<<8) & 0xff00; address |= addr[0]; ret = (*env)->NewObjectArray(env, 1, ia_class, NULL); if (IS_NULL(ret)) { goto cleanupAndReturn; } iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID); if (IS_NULL(iaObj)) { ret = NULL; goto cleanupAndReturn; } setInetAddress_addr(env, iaObj, ntohl(address)); if ((*env)->ExceptionCheck(env)) goto cleanupAndReturn; (*env)->SetObjectArrayElement(env, ret, 0, iaObj); JNU_ReleaseStringPlatformChars(env, host, hostname); return ret; } /* * Perform the lookup */ if ((hp = gethostbyname((char*)hostname)) != NULL) { struct in_addr **addrp = (struct in_addr **) hp->h_addr_list; int len = sizeof(struct in_addr); int i = 0; while (*addrp != (struct in_addr *) 0) { i++; addrp++; } ret = (*env)->NewObjectArray(env, i, ia_class, NULL); if (IS_NULL(ret)) { goto cleanupAndReturn; } addrp = (struct in_addr **) hp->h_addr_list; i = 0; while (*addrp != (struct in_addr *) 0) { jobject iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID); if (IS_NULL(iaObj)) { ret = NULL; goto cleanupAndReturn; } setInetAddress_addr(env, iaObj, ntohl((*addrp)->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); addrp++; i++; } } else if (WSAGetLastError() == WSATRY_AGAIN) { NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "UnknownHostException", hostname); } else { JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); } cleanupAndReturn: JNU_ReleaseStringPlatformChars(env, host, hostname); return ret; } /* * Class: java_net_Inet4AddressImpl * Method: getHostByAddr * Signature: (I)Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_java_net_Inet4AddressImpl_getHostByAddr(JNIEnv *env, jobject this, jbyteArray addrArray) { struct hostent *hp; jbyte caddr[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); addr = htonl(addr); hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET); if (hp == NULL) { JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); return NULL; } if (hp->h_name == NULL) { /* Deal with bug in Windows XP */ JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); return NULL; } return JNU_NewStringPlatform(env, hp->h_name); } static BOOL WindowsVersionCheck(WORD wMajorVersion, WORD wMinorVersion, WORD wServicePackMajor) { OSVERSIONINFOEXW osvi = { sizeof(osvi), 0, 0, 0, 0, {0}, 0, 0 }; DWORDLONG const dwlConditionMask = VerSetConditionMask( VerSetConditionMask( VerSetConditionMask( 0, VER_MAJORVERSION, VER_GREATER_EQUAL), VER_MINORVERSION, VER_GREATER_EQUAL), VER_SERVICEPACKMAJOR, VER_GREATER_EQUAL); osvi.dwMajorVersion = wMajorVersion; osvi.dwMinorVersion = wMinorVersion; osvi.wServicePackMajor = wServicePackMajor; return VerifyVersionInfoW(&osvi, VER_MAJORVERSION | VER_MINORVERSION | VER_SERVICEPACKMAJOR, dwlConditionMask) != FALSE; } static BOOL isVistaSP1OrGreater() { return WindowsVersionCheck(HIBYTE(_WIN32_WINNT_VISTA), LOBYTE(_WIN32_WINNT_VISTA), 1); } static jboolean tcp_ping4(JNIEnv *env, jbyteArray addrArray, jint timeout, jbyteArray ifArray, jint ttl) { jint addr; jbyte caddr[4]; jint fd; struct sockaddr_in him; struct sockaddr_in* netif = NULL; struct sockaddr_in inf; int len = 0; WSAEVENT hEvent; int connect_rv = -1; int sz; /** * Convert IP address from byte array to integer */ sz = (*env)->GetArrayLength(env, addrArray); if (sz != 4) { return JNI_FALSE; } memset((char *) &him, 0, sizeof(him)); 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); addr = htonl(addr); /** * Socket address */ him.sin_addr.s_addr = addr; him.sin_family = AF_INET; len = sizeof(him); /** * 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); addr = htonl(addr); inf.sin_addr.s_addr = addr; inf.sin_family = AF_INET; inf.sin_port = 0; netif = &inf; } /* * Can't create a raw socket, so let's try a TCP socket */ fd = NET_Socket(AF_INET, 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, WSAGetLastError(), "Can't create socket"); return JNI_FALSE; } 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, (struct sockaddr*)netif, 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); /* no need to use NET_Connect as non-blocking */ him.sin_port = htons(7); /* Echo */ connect_rv = connect(fd, (struct sockaddr *)&him, 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); /* has connection been established */ if (timeout >= 0) { 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, unsigned long src_addr, unsigned long dest_addr, jint timeout, HANDLE hIcmpFile) { // See https://msdn.microsoft.com/en-us/library/aa366050%28VS.85%29.aspx DWORD dwRetVal = 0; char SendData[32] = {0}; LPVOID ReplyBuffer = NULL; DWORD ReplySize = 0; jboolean ret = JNI_FALSE; // 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 (src_addr == 0) { dwRetVal = IcmpSendEcho(hIcmpFile, // HANDLE IcmpHandle, dest_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 src_addr, // IPAddr SourceAddress, dest_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) { if (isVistaSP1OrGreater()) { jint src_addr = 0; jint dest_addr = 0; jbyte caddr[4]; int sz; HANDLE hIcmpFile; /** * Convert IP address from byte array to integer */ sz = (*env)->GetArrayLength(env, addrArray); if (sz != 4) { return JNI_FALSE; } memset((char *) caddr, 0, sizeof(caddr)); (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); dest_addr = ((caddr[0]<<24) & 0xff000000); dest_addr |= ((caddr[1] <<16) & 0xff0000); dest_addr |= ((caddr[2] <<8) & 0xff00); dest_addr |= (caddr[3] & 0xff); dest_addr = htonl(dest_addr); /** * 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); src_addr = ((caddr[0]<<24) & 0xff000000); src_addr |= ((caddr[1] <<16) & 0xff0000); src_addr |= ((caddr[2] <<8) & 0xff00); src_addr |= (caddr[3] & 0xff); src_addr = htonl(src_addr); } 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, addrArray, timeout, ifArray, ttl); } else { NET_ThrowNew(env, err, "Unable to create ICMP file handle"); return JNI_FALSE; } } else { return ping4(env, src_addr, dest_addr, timeout, hIcmpFile); } } else { tcp_ping4(env, addrArray, timeout, ifArray, ttl); } }