| /* |
| * Copyright (c) 2000, 2011, 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_systm.h> |
| #include <netinet/in.h> |
| #include <netinet/ip.h> |
| #include <netinet/ip_icmp.h> |
| #include <netdb.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| |
| #ifdef _ALLBSD_SOURCE |
| #include <unistd.h> |
| #include <sys/param.h> |
| #endif |
| |
| #include "jvm.h" |
| #include "jni_util.h" |
| #include "net_util.h" |
| |
| #include "JNIHelp.h" |
| |
| #define NATIVE_METHOD(className, functionName, signature) \ |
| { #functionName, signature, (void*)(className ## _ ## functionName) } |
| |
| //#if defined(__GLIBC__) || (defined(__FreeBSD__) && (__FreeBSD_version >= 601104)) |
| #define HAS_GLIBC_GETHOSTBY_R 1 |
| //#endif |
| |
| #define SET_NONBLOCKING(fd) { \ |
| int flags = fcntl(fd, F_GETFL); \ |
| flags |= O_NONBLOCK; \ |
| fcntl(fd, F_SETFL, flags); \ |
| } |
| |
| /** |
| * 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, hlen1, icmplen; |
| socklen_t len; |
| char sendbuf[1500]; |
| char recvbuf[1500]; |
| struct icmp *icmp; |
| struct ip *ip; |
| struct sockaddr_in sa_recv; |
| jchar pid; |
| jint tmout2, seq = 1; |
| struct timeval tv; |
| size_t plen; |
| |
| /* 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)); |
| /* |
| * 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, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { |
| NET_ThrowNew(env, errno, "Can't bind socket"); |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
| /* |
| * 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; |
| icmp->icmp_id = htons(pid); |
| icmp->icmp_seq = htons(seq); |
| seq++; |
| gettimeofday(&tv, NULL); |
| memcpy(icmp->icmp_data, &tv, sizeof(tv)); |
| plen = ICMP_ADVLENMIN + sizeof(tv); |
| icmp->icmp_cksum = 0; |
| icmp->icmp_cksum = in_cksum((u_short *)icmp, plen); |
| /* |
| * send it |
| */ |
| n = sendto(fd, sendbuf, plen, 0, (struct sockaddr *)him, |
| sizeof(struct sockaddr)); |
| 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"); |
| untagSocket(env, fd); |
| 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); |
| ip = (struct ip*) recvbuf; |
| hlen1 = (ip->ip_hl) << 2; |
| icmp = (struct icmp *) (recvbuf + hlen1); |
| icmplen = n - hlen1; |
| /* |
| * We did receive something, but is it what we were expecting? |
| * I.E.: A ICMP_ECHOREPLY packet with the proper PID. |
| */ |
| if (icmplen >= 8 && icmp->icmp_type == ICMP_ECHOREPLY |
| && (ntohs(icmp->icmp_id) == pid)) { |
| if ((him->sin_addr.s_addr == sa_recv.sin_addr.s_addr)) { |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_TRUE; |
| } |
| |
| if (him->sin_addr.s_addr == 0) { |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| |
| } |
| } while (tmout2 > 0); |
| timeout -= 1000; |
| } while (timeout >0); |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| /* |
| * Class: java_net_Inet4AddressImpl |
| * Method: isReachable0 |
| * Signature: ([bI[bI)Z |
| */ |
| JNIEXPORT jboolean JNICALL |
| 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; |
| int connect_rv = -1; |
| int sz; |
| |
| memset((char *) caddr, 0, sizeof(caddr)); |
| memset((char *) &him, 0, sizeof(him)); |
| memset((char *) &inf, 0, sizeof(inf)); |
| sz = (*env)->GetArrayLength(env, addrArray); |
| if (sz != 4) { |
| return JNI_FALSE; |
| } |
| (*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); |
| him.sin_addr.s_addr = addr; |
| him.sin_family = AF_INET; |
| len = sizeof(him); |
| /* |
| * If a network interface was specified, let's create the address |
| * for it. |
| */ |
| 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; |
| } |
| |
| /* |
| * Let's try to create a RAW socket to send ICMP packets |
| * This usually requires "root" privileges, so it's likely to fail. |
| */ |
| fd = JVM_Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| if (fd != -1) { |
| /* |
| * It didn't fail, so we can use ICMP_ECHO requests. |
| */ |
| tagSocket(env, fd); |
| return ping4(env, fd, &him, timeout, netif, ttl); |
| } |
| |
| /* |
| * Can't create a raw socket, so let's try a TCP socket |
| */ |
| fd = JVM_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, errno, "Can't create socket"); |
| return JNI_FALSE; |
| } |
| tagSocket(env, fd); |
| |
| 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, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { |
| NET_ThrowNew(env, errno, "Can't bind socket"); |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
| |
| /* |
| * Make the socket non blocking so we can use select/poll. |
| */ |
| SET_NONBLOCKING(fd); |
| |
| /* no need to use NET_Connect as non-blocking */ |
| him.sin_port = htons(7); /* Echo */ |
| connect_rv = JVM_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 || errno == ECONNREFUSED) { |
| untagSocket(env, fd); |
| 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__ */ |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| if (errno != EINPROGRESS) { |
| NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException", |
| "connect failed"); |
| untagSocket(env, fd); |
| 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 || connect_rv == ECONNREFUSED) { |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| untagSocket(env, fd); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
