| /* |
| * Copyright (c) 2000, 2016, 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 <ctype.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <netinet/in.h> |
| #include <netinet/in_systm.h> |
| #include <netinet/ip.h> |
| #include <netinet/ip_icmp.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/time.h> |
| |
| #include "net_util.h" |
| |
| #include "java_net_Inet4AddressImpl.h" |
| |
| #if defined(MACOSX) |
| extern jobjectArray lookupIfLocalhost(JNIEnv *env, const char *hostname, jboolean includeV6); |
| #endif |
| |
| /* the initial size of our hostent buffers */ |
| #ifndef NI_MAXHOST |
| #define NI_MAXHOST 1025 |
| #endif |
| |
| #define SET_NONBLOCKING(fd) { \ |
| int flags = fcntl(fd, F_GETFL); \ |
| flags |= O_NONBLOCK; \ |
| fcntl(fd, F_SETFL, flags); \ |
| } |
| |
| /* |
| * 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[NI_MAXHOST + 1]; |
| |
| hostname[0] = '\0'; |
| if (gethostname(hostname, NI_MAXHOST) != 0) { |
| strcpy(hostname, "localhost"); |
| } else { |
| // try to resolve hostname via nameservice |
| // if it is known but getnameinfo fails, hostname will still be the |
| // value from gethostname |
| struct addrinfo hints, *res; |
| |
| // make sure string is null-terminated |
| hostname[NI_MAXHOST] = '\0'; |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_flags = AI_CANONNAME; |
| hints.ai_family = AF_INET; |
| |
| if (getaddrinfo(hostname, NULL, &hints, &res) == 0) { |
| getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, |
| NULL, 0, NI_NAMEREQD); |
| freeaddrinfo(res); |
| } |
| } |
| return (*env)->NewStringUTF(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) { |
| #if defined(MACOSX) |
| // If getaddrinfo fails try getifaddrs, see bug 8170910. |
| ret = lookupIfLocalhost(env, hostname, JNI_FALSE); |
| if (ret != NULL || (*env)->ExceptionCheck(env)) { |
| goto cleanupAndReturn; |
| } |
| #endif |
| // report error |
| NET_ThrowUnknownHostExceptionWithGaiError(env, hostname, error); |
| 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)); |
| setInetAddress_hostName(env, iaObj, host); |
| (*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; |
| |
| // open a TCP socket |
| fd = socket(AF_INET, 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_IP, IP_TTL, &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, 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->sa4.sin_port = htons(7); // echo port |
| connect_rv = NET_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 || 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 |
| ping4(JNIEnv *env, jint fd, SOCKETADDRESS *sa, SOCKETADDRESS *netif, |
| jint timeout, jint ttl) |
| { |
| jint n, size = 60 * 1024, hlen, tmout2, seq = 1; |
| socklen_t len; |
| unsigned char sendbuf[1500], recvbuf[1500]; |
| struct icmp *icmp; |
| struct ip *ip; |
| struct sockaddr_in sa_recv; |
| jchar pid; |
| struct timeval tv; |
| size_t plen = ICMP_ADVLENMIN + sizeof(tv); |
| |
| setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); |
| |
| // sets the ttl (max number of hops) |
| if (ttl > 0) { |
| setsockopt(fd, IPPROTO_IP, IP_TTL, &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_in)) < 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 |
| icmp = (struct icmp *)sendbuf; |
| icmp->icmp_type = ICMP_ECHO; |
| icmp->icmp_code = 0; |
| // let's tag the ECHO packet with our pid so we can identify it |
| icmp->icmp_id = htons(pid); |
| icmp->icmp_seq = htons(seq); |
| seq++; |
| gettimeofday(&tv, NULL); |
| memcpy(icmp->icmp_data, &tv, sizeof(tv)); |
| icmp->icmp_cksum = 0; |
| // manually calculate checksum |
| icmp->icmp_cksum = in_cksum((u_short *)icmp, plen); |
| // send it |
| n = sendto(fd, sendbuf, plen, 0, &sa->sa, sizeof(struct sockaddr_in)); |
| 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 ip)) { |
| continue; |
| } |
| ip = (struct ip *)recvbuf; |
| hlen = ((jint)(unsigned int)(ip->ip_hl)) << 2; |
| // check if we received enough data |
| if (n < (jint)(hlen + sizeof(struct icmp))) { |
| continue; |
| } |
| icmp = (struct icmp *)(recvbuf + hlen); |
| // We did receive something, but is it what we were expecting? |
| // I.E.: An ICMP_ECHO_REPLY packet with the proper PID and |
| // from the host that we are trying to determine is reachable. |
| if (icmp->icmp_type == ICMP_ECHOREPLY && |
| (ntohs(icmp->icmp_id) == pid)) |
| { |
| if (sa->sa4.sin_addr.s_addr == sa_recv.sin_addr.s_addr) { |
| close(fd); |
| return JNI_TRUE; |
| } else if (sa->sa4.sin_addr.s_addr == 0) { |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| } |
| } while (tmout2 > 0); |
| timeout -= 1000; |
| } while (timeout > 0); |
| close(fd); |
| 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) |
| { |
| jbyte caddr[4]; |
| jint addr = 0, sz, fd; |
| SOCKETADDRESS sa, inf, *netif = NULL; |
| |
| // 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 a RAW socket to send ICMP packets. |
| // This usually requires "root" privileges, so it's likely to fail. |
| fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| if (fd == -1) { |
| return tcp_ping4(env, &sa, netif, timeout, ttl); |
| } else { |
| // It didn't fail, so we can use ICMP_ECHO requests. |
| return ping4(env, fd, &sa, netif, timeout, ttl); |
| } |
| } |