| /* |
| * Copyright (c) 2000, 2008, 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 <windows.h> |
| #include <winsock2.h> |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <malloc.h> |
| #include <sys/types.h> |
| #include <process.h> |
| |
| #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); |
| } |
| |
| static jclass ni_iacls; |
| static jclass ni_ia4cls; |
| static jmethodID ni_ia4ctrID; |
| static jfieldID ni_iaaddressID; |
| static jfieldID ni_iahostID; |
| static jfieldID ni_iafamilyID; |
| static int initialized = 0; |
| |
| /* |
| * 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; |
| |
| if (!initialized) { |
| ni_iacls = (*env)->FindClass(env, "java/net/InetAddress"); |
| ni_iacls = (*env)->NewGlobalRef(env, ni_iacls); |
| ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address"); |
| ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls); |
| ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V"); |
| ni_iaaddressID = (*env)->GetFieldID(env, ni_iacls, "address", "I"); |
| ni_iafamilyID = (*env)->GetFieldID(env, ni_iacls, "family", "I"); |
| ni_iahostID = (*env)->GetFieldID(env, ni_iacls, "hostName", "Ljava/lang/String;"); |
| initialized = 1; |
| } |
| |
| 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, ni_iacls, NULL); |
| |
| if (IS_NULL(ret)) { |
| goto cleanupAndReturn; |
| } |
| |
| iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID); |
| if (IS_NULL(iaObj)) { |
| ret = NULL; |
| goto cleanupAndReturn; |
| } |
| (*env)->SetIntField(env, iaObj, ni_iaaddressID, |
| ntohl(address)); |
| (*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, ni_iacls, 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, ni_ia4cls, ni_ia4ctrID); |
| if (IS_NULL(iaObj)) { |
| ret = NULL; |
| goto cleanupAndReturn; |
| } |
| (*env)->SetIntField(env, iaObj, ni_iaaddressID, |
| ntohl((*addrp)->s_addr)); |
| (*env)->SetObjectField(env, iaObj, ni_iahostID, host); |
| (*env)->SetObjectArrayElement(env, ret, i, iaObj); |
| addrp++; |
| i++; |
| } |
| } 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); |
| } |
| |
| |
| /** |
| * 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, jint fd, struct sockaddr_in* him, jint timeout, |
| struct sockaddr_in* netif, jint ttl) { |
| jint size; |
| jint n, len, hlen1, icmplen; |
| char sendbuf[1500]; |
| char recvbuf[1500]; |
| struct icmp *icmp; |
| struct ip *ip; |
| WSAEVENT hEvent; |
| struct sockaddr sa_recv; |
| jint tmout2; |
| u_short pid, seq; |
| int read_rv = 0; |
| |
| /* Initialize the sequence number to a suitable random number and |
| shift right one place to allow sufficient room for increamenting. */ |
| seq = ((unsigned short)rand()) >> 1; |
| |
| /* icmp_id is a 16 bit data type, therefore down cast the pid */ |
| pid = (u_short) _getpid(); |
| size = 60*1024; |
| setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (const char *) &size, sizeof(size)); |
| /** |
| * A TTL was specified, let's set the socket option. |
| */ |
| if (ttl > 0) { |
| setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *) &ttl, sizeof(ttl)); |
| } |
| |
| /** |
| * A network interface was specified, 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; |
| } |
| } |
| |
| /** |
| * Let's make the socket non blocking |
| */ |
| hEvent = WSACreateEvent(); |
| WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); |
| |
| /** |
| * send 1 ICMP REQUEST every second until either we get a valid reply |
| * or the timeout expired. |
| */ |
| do { |
| /** |
| * construct the ICMP header |
| */ |
| memset(sendbuf, 0, 1500); |
| icmp = (struct icmp *) sendbuf; |
| icmp->icmp_type = ICMP_ECHO; |
| icmp->icmp_code = 0; |
| icmp->icmp_id = htons(pid); |
| icmp->icmp_seq = htons(seq); |
| /** |
| * checksum has to be set to zero before we can calculate the |
| * real checksum! |
| */ |
| icmp->icmp_cksum = 0; |
| icmp->icmp_cksum = in_cksum((u_short *)icmp, 64); |
| /** |
| * Ping! |
| */ |
| n = sendto(fd, sendbuf, 64, 0, (struct sockaddr *)him, |
| sizeof(struct sockaddr)); |
| if (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK) { |
| NET_ThrowNew(env, WSAGetLastError(), "Can't send ICMP packet"); |
| closesocket(fd); |
| WSACloseEvent(hEvent); |
| return JNI_FALSE; |
| } |
| |
| /* |
| * wait for 1 second at most |
| */ |
| 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, &sa_recv, &len); |
| ip = (struct ip*) recvbuf; |
| hlen1 = (ip->ip_hl) << 2; |
| icmp = (struct icmp *) (recvbuf + hlen1); |
| icmplen = n - hlen1; |
| /** |
| * Is that a proper ICMP reply? |
| */ |
| if (icmplen >= 8 && icmp->icmp_type == ICMP_ECHOREPLY && |
| (ntohs(icmp->icmp_seq) == seq) && (ntohs(icmp->icmp_id) == pid)) { |
| closesocket(fd); |
| WSACloseEvent(hEvent); |
| return JNI_TRUE; |
| } |
| } |
| } while (tmout2 > 0); |
| timeout -= 1000; |
| seq++; |
| } while (timeout > 0); |
| closesocket(fd); |
| WSACloseEvent(hEvent); |
| return JNI_FALSE; |
| } |
| |
| /* |
| * 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) { |
| 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; |
| } |
| |
| #if 0 |
| /* |
| * Windows implementation of ICMP & RAW sockets is too unreliable for now. |
| * Therefore it's best not to try it at all and rely only on TCP |
| * We may revisit and enable this code in the future. |
| */ |
| |
| /* |
| * Let's try to create a RAW socket to send ICMP packets |
| * This usually requires "root" privileges, so it's likely to fail. |
| */ |
| fd = NET_Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| if (fd != -1) { |
| /* |
| * It didn't fail, so we can use ICMP_ECHO requests. |
| */ |
| return ping4(env, fd, &him, timeout, netif, ttl); |
| } |
| #endif |
| |
| /* |
| * 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 (JVM_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; |
| } |
