| /* |
| * Copyright (c) 2000, 2019, 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 <stdlib.h> |
| #include <string.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <netinet/in.h> |
| #include <netinet/icmp6.h> |
| |
| #if defined(_ALLBSD_SOURCE) |
| #include <ifaddrs.h> |
| #include <net/if.h> |
| #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 { |
| #if defined(__solaris__) |
| // 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_UNSPEC; |
| |
| if (getaddrinfo(hostname, NULL, &hints, &res) == 0) { |
| getnameinfo(res->ai_addr, res->ai_addrlen, hostname, sizeof(hostname), |
| NULL, 0, NI_NAMEREQD); |
| freeaddrinfo(res); |
| } |
| #else |
| // make sure string is null-terminated |
| hostname[NI_MAXHOST] = '\0'; |
| #endif |
| } |
| 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: (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_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[bI)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; |
| #if defined(__linux__) |
| } else { |
| sa.sa6.sin6_scope_id = getDefaultIPv6Interface(&sa.sa6.sin6_addr); |
| #endif |
| } |
| |
| // 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); |
| } |
| } |
