--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/unix/native/libnet/Inet4AddressImpl.c Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,513 @@
+/*
+ * 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);
+ }
+}