| /* |
| * Copyright (c) 2000, 2012, 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 <errno.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <netdb.h> |
| #include <string.h> |
| #include <strings.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| #ifdef _ALLBSD_SOURCE |
| #include <unistd.h> /* gethostname */ |
| #endif |
| |
| #include "jvm.h" |
| #include "jni_util.h" |
| #include "net_util.h" |
| #ifndef IPV6_DEFS_H |
| #include <netinet/icmp6.h> |
| #endif |
| |
| #include "java_net_Inet4AddressImpl.h" |
| #include "JNIHelp.h" |
| |
| #define NATIVE_METHOD(className, functionName, signature) \ |
| { #functionName, signature, (void*)(className ## _ ## functionName) } |
| |
| /* the initial size of our hostent buffers */ |
| #ifndef NI_MAXHOST |
| #define NI_MAXHOST 1025 |
| #endif |
| |
| |
| /************************************************************************ |
| * Inet6AddressImpl |
| */ |
| |
| static jclass ni_iacls; |
| static jclass ni_ia4cls; |
| static jclass ni_ia6cls; |
| static jmethodID ni_ia4ctrID; |
| static jmethodID ni_ia6ctrID; |
| static jfieldID ni_ia6ipaddressID; |
| static int initialized = 0; |
| |
| /* |
| * Class: java_net_Inet6AddressImpl |
| * Method: getHostByAddr |
| * Signature: (I)Ljava/lang/String; |
| */ |
| JNIEXPORT jstring JNICALL |
| Inet6AddressImpl_getHostByAddr0(JNIEnv *env, jobject this, |
| jbyteArray addrArray) { |
| |
| jstring ret = NULL; |
| |
| #ifdef AF_INET6 |
| char host[NI_MAXHOST+1]; |
| int error = 0; |
| int len = 0; |
| jbyte caddr[16]; |
| |
| if (NET_addrtransAvailable()) { |
| struct sockaddr_in him4; |
| struct sockaddr_in6 him6; |
| struct sockaddr *sa; |
| |
| /* |
| * For IPv4 addresses construct a sockaddr_in structure. |
| */ |
| 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); |
| memset((void *) &him4, 0, sizeof(him4)); |
| him4.sin_addr.s_addr = (uint32_t) htonl(addr); |
| him4.sin_family = AF_INET; |
| sa = (struct sockaddr *) &him4; |
| len = sizeof(him4); |
| } else { |
| /* |
| * For IPv6 address construct a sockaddr_in6 structure. |
| */ |
| (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr); |
| memset((void *) &him6, 0, sizeof(him6)); |
| memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) ); |
| him6.sin6_family = AF_INET6; |
| sa = (struct sockaddr *) &him6 ; |
| len = sizeof(him6) ; |
| } |
| |
| error = (*getnameinfo_ptr)(sa, len, host, NI_MAXHOST, NULL, 0, |
| NI_NAMEREQD); |
| |
| if (!error) { |
| ret = (*env)->NewStringUTF(env, host); |
| } |
| } |
| #endif /* AF_INET6 */ |
| |
| if (ret == NULL) { |
| JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL); |
| } |
| |
| return ret; |
| } |
| |
| #define SET_NONBLOCKING(fd) { \ |
| int flags = fcntl(fd, F_GETFL); \ |
| flags |= O_NONBLOCK; \ |
| fcntl(fd, F_SETFL, flags); \ |
| } |
| |
| #ifdef AF_INET6 |
| static jboolean |
| ping6(JNIEnv *env, jint fd, struct sockaddr_in6* him, jint timeout, |
| struct sockaddr_in6* netif, jint ttl) { |
| jint size; |
| jint n; |
| socklen_t len; |
| char sendbuf[1500]; |
| unsigned char recvbuf[1500]; |
| struct icmp6_hdr *icmp6; |
| struct sockaddr_in6 sa_recv; |
| jbyte *caddr, *recv_caddr; |
| jchar pid; |
| jint tmout2, seq = 1; |
| struct timeval tv; |
| size_t plen; |
| |
| #ifdef __linux__ |
| { |
| int csum_offset; |
| /** |
| * For some strange reason, the linux kernel won't calculate the |
| * checksum of ICMPv6 packets unless you set this socket option |
| */ |
| csum_offset = 2; |
| setsockopt(fd, SOL_RAW, IPV6_CHECKSUM, &csum_offset, sizeof(int)); |
| } |
| #endif |
| |
| caddr = (jbyte *)&(him->sin6_addr); |
| |
| /* icmp_id is a 16 bit data type, therefore down cast the pid */ |
| pid = (jchar)getpid(); |
| size = 60*1024; |
| setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); |
| if (ttl > 0) { |
| setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)); |
| } |
| if (netif != NULL) { |
| if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) { |
| NET_ThrowNew(env, errno, "Can't bind socket"); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
| SET_NONBLOCKING(fd); |
| |
| do { |
| 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++; |
| icmp6->icmp6_cksum = 0; |
| gettimeofday(&tv, NULL); |
| memcpy(sendbuf + sizeof(struct icmp6_hdr), &tv, sizeof(tv)); |
| plen = sizeof(struct icmp6_hdr) + sizeof(tv); |
| n = sendto(fd, sendbuf, plen, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6)); |
| if (n < 0 && errno != EINPROGRESS) { |
| #ifdef __linux__ |
| if (errno != EINVAL && errno != EHOSTUNREACH) |
| /* |
| * On some Linuxes, when 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. |
| */ |
| #endif /*__linux__ */ |
| NET_ThrowNew(env, errno, "Can't send ICMP packet"); |
| 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); |
| icmp6 = (struct icmp6_hdr *) (recvbuf); |
| recv_caddr = (jbyte *)&(sa_recv.sin6_addr); |
| /* |
| * 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 (n >= 8 && icmp6->icmp6_type == ICMP6_ECHO_REPLY && |
| (ntohs(icmp6->icmp6_id) == pid)) { |
| if (NET_IsEqual(caddr, recv_caddr)) { |
| close(fd); |
| return JNI_TRUE; |
| } |
| if (NET_IsZeroAddr(caddr)) { |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| } |
| } while (tmout2 > 0); |
| timeout -= 1000; |
| } while (timeout > 0); |
| close(fd); |
| return JNI_FALSE; |
| } |
| #endif /* AF_INET6 */ |
| |
| /* |
| * Class: java_net_Inet6AddressImpl |
| * Method: isReachable0 |
| * Signature: ([bII[bI)Z |
| */ |
| JNIEXPORT jboolean JNICALL |
| Inet6AddressImpl_isReachable0(JNIEnv *env, jobject this, |
| jbyteArray addrArray, |
| jint scope, |
| jint timeout, |
| jbyteArray ifArray, |
| jint ttl, jint if_scope) { |
| #ifdef AF_INET6 |
| jbyte caddr[16]; |
| jint fd, sz; |
| struct sockaddr_in6 him6; |
| struct sockaddr_in6 inf6; |
| struct sockaddr_in6* netif = NULL; |
| int len = 0; |
| int connect_rv = -1; |
| |
| /* |
| * If IPv6 is not enable, then we can't reach an IPv6 address, can we? |
| */ |
| 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 Inet4AddressImpl_isReachable0(env, this, |
| addrArray, |
| timeout, |
| ifArray, ttl); |
| } |
| |
| memset((void *) caddr, 0, 16); |
| memset((void *) &him6, 0, sizeof(him6)); |
| (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr); |
| memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) ); |
| him6.sin6_family = AF_INET6; |
| |
| // Android-change: Don't try and figure out a default scope ID if one isn't |
| // set. It's only useful for link local addresses anyway, and callers are |
| // expected to call isReachable with a specific NetworkInterface if they |
| // want to query the reachability of an address that's local to that IF. |
| if (scope > 0) |
| him6.sin6_scope_id = scope; |
| len = sizeof(struct sockaddr_in6); |
| /* |
| * If a network interface was specified, let's create the address |
| * for it. |
| */ |
| if (!(IS_NULL(ifArray))) { |
| memset((void *) caddr, 0, 16); |
| memset((void *) &inf6, 0, sizeof(inf6)); |
| (*env)->GetByteArrayRegion(env, ifArray, 0, 16, caddr); |
| memcpy((void *)&(inf6.sin6_addr), caddr, sizeof(struct in6_addr) ); |
| inf6.sin6_family = AF_INET6; |
| inf6.sin6_scope_id = if_scope; |
| netif = &inf6; |
| } |
| /* |
| * If we can create a RAW socket, then when can use the ICMP ECHO_REQUEST |
| * otherwise we'll try a tcp socket to the Echo port (7). |
| * Note that this is empiric, and not connecting could mean it's blocked |
| * or the echo servioe has been disabled. |
| */ |
| |
| fd = JVM_Socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); |
| |
| if (fd != -1) { /* Good to go, let's do a ping */ |
| return ping6(env, fd, &him6, timeout, netif, ttl); |
| } |
| |
| /* No good, let's fall back on TCP */ |
| fd = JVM_Socket(AF_INET6, 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, errno, "Can't create socket"); |
| return JNI_FALSE; |
| } |
| 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, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) { |
| NET_ThrowNew(env, errno, "Can't bind socket"); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
| SET_NONBLOCKING(fd); |
| |
| /* no need to use NET_Connect as non-blocking */ |
| him6.sin6_port = htons((short) 7); /* Echo port */ |
| connect_rv = JVM_Connect(fd, (struct sockaddr *)&him6, len); |
| |
| /** |
| * 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; |
| } else { |
| int optlen; |
| |
| switch (errno) { |
| case ENETUNREACH: /* Network Unreachable */ |
| case EAFNOSUPPORT: /* Address Family not supported */ |
| case EADDRNOTAVAIL: /* address is not available on the remote machine */ |
| #ifdef __linux__ |
| case EINVAL: |
| case EHOSTUNREACH: |
| /* |
| * On some Linuxes, when 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. |
| */ |
| #endif /* __linux__ */ |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| if (errno != EINPROGRESS) { |
| 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) { |
| /* has connection been established */ |
| optlen = sizeof(connect_rv); |
| if (JVM_GetSockOpt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv, |
| &optlen) <0) { |
| connect_rv = errno; |
| } |
| if (connect_rv == 0 || ECONNREFUSED) { |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| close(fd); |
| return JNI_FALSE; |
| } |
| #else /* AF_INET6 */ |
| return JNI_FALSE; |
| #endif /* AF_INET6 */ |
| } |
| |
| static JNINativeMethod gMethods[] = { |
| NATIVE_METHOD(Inet6AddressImpl, isReachable0, "([BII[BII)Z"), |
| NATIVE_METHOD(Inet6AddressImpl, getHostByAddr0, "([B)Ljava/lang/String;"), |
| }; |
| |
| void register_java_net_Inet6AddressImpl(JNIEnv* env) { |
| jniRegisterNativeMethods(env, "java/net/Inet6AddressImpl", gMethods, NELEM(gMethods)); |
| } |
