| /* |
| * Copyright (c) 2001, 2008, 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 "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "jlong.h" |
| #include <io.h> |
| #include "sun_nio_ch_DatagramChannelImpl.h" |
| #include "nio.h" |
| #include "nio_util.h" |
| #include "net_util.h" |
| #include <winsock2.h> |
| |
| static jfieldID isa_addrID; /* address in java.net.InetSocketAddress */ |
| static jfieldID isa_portID; /* port in java.net.InetSocketAddress */ |
| static jfieldID dci_senderID; /* sender in sun.nio.ch.DatagramChannelImpl */ |
| static jfieldID dci_senderAddrID; /* sender InetAddress in sun.nio.ch.DatagramChannelImpl */ |
| static jfieldID dci_senderPortID; /* sender port in sun.nio.ch.DatagramChannelImpl */ |
| static jclass isa_class; /* java.net.InetSocketAddress */ |
| static jmethodID isa_ctorID; /* java.net.InetSocketAddress(InetAddress, int) */ |
| |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_DatagramChannelImpl_initIDs(JNIEnv *env, jclass clazz) |
| { |
| clazz = (*env)->FindClass(env, "java/net/InetSocketAddress"); |
| isa_class = (*env)->NewGlobalRef(env, clazz); |
| isa_ctorID = (*env)->GetMethodID(env, clazz, "<init>", |
| "(Ljava/net/InetAddress;I)V"); |
| isa_addrID = (*env)->GetFieldID(env, clazz, "addr", |
| "Ljava/net/InetAddress;"); |
| isa_portID = (*env)->GetFieldID(env, clazz, "port", "I"); |
| |
| clazz = (*env)->FindClass(env, "sun/nio/ch/DatagramChannelImpl"); |
| dci_senderID = (*env)->GetFieldID(env, clazz, "sender", |
| "Ljava/net/SocketAddress;"); |
| dci_senderAddrID = (*env)->GetFieldID(env, clazz, |
| "cachedSenderInetAddress", |
| "Ljava/net/InetAddress;"); |
| dci_senderPortID = (*env)->GetFieldID(env, clazz, |
| "cachedSenderPort", "I"); |
| } |
| |
| /* |
| * This function "purges" all outstanding ICMP port unreachable packets |
| * outstanding on a socket and returns JNI_TRUE if any ICMP messages |
| * have been purged. The rational for purging is to emulate normal BSD |
| * behaviour whereby receiving a "connection reset" status resets the |
| * socket. |
| */ |
| jboolean purgeOutstandingICMP(JNIEnv *env, jclass clazz, jint fd) |
| { |
| jboolean got_icmp = JNI_FALSE; |
| char buf[1]; |
| fd_set tbl; |
| struct timeval t = { 0, 0 }; |
| SOCKETADDRESS sa; |
| int addrlen = sizeof(sa); |
| |
| /* |
| * Peek at the queue to see if there is an ICMP port unreachable. If there |
| * is then receive it. |
| */ |
| FD_ZERO(&tbl); |
| FD_SET((u_int)fd, &tbl); |
| while(1) { |
| if (select(/*ignored*/fd+1, &tbl, 0, 0, &t) <= 0) { |
| break; |
| } |
| if (recvfrom(fd, buf, 1, MSG_PEEK, |
| (struct sockaddr *)&sa, &addrlen) != SOCKET_ERROR) { |
| break; |
| } |
| if (WSAGetLastError() != WSAECONNRESET) { |
| /* some other error - we don't care here */ |
| break; |
| } |
| |
| recvfrom(fd, buf, 1, 0, (struct sockaddr *)&sa, &addrlen); |
| got_icmp = JNI_TRUE; |
| } |
| |
| return got_icmp; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_DatagramChannelImpl_disconnect0(JNIEnv *env, jobject this, |
| jobject fdo) |
| { |
| jint fd = fdval(env, fdo); |
| int rv = 0; |
| SOCKETADDRESS sa; |
| int sa_len = sizeof(sa); |
| |
| memset(&sa, 0, sa_len); |
| |
| rv = connect((SOCKET)fd, (struct sockaddr *)&sa, sa_len); |
| if (rv == SOCKET_ERROR) { |
| handleSocketError(env, WSAGetLastError()); |
| } |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_DatagramChannelImpl_receive0(JNIEnv *env, jobject this, |
| jobject fdo, jlong address, |
| jint len, jboolean connected) |
| { |
| jint fd = fdval(env, fdo); |
| void *buf = (void *)jlong_to_ptr(address); |
| SOCKETADDRESS sa; |
| int sa_len = sizeof(sa); |
| BOOL retry = FALSE; |
| jint n; |
| jobject senderAddr; |
| |
| do { |
| retry = FALSE; |
| n = recvfrom((SOCKET)fd, |
| (char *)buf, |
| len, |
| 0, |
| (struct sockaddr *)&sa, |
| &sa_len); |
| |
| if (n == SOCKET_ERROR) { |
| int theErr = (jint)WSAGetLastError(); |
| if (theErr == WSAEMSGSIZE) { |
| /* Spec says the rest of the data will be discarded... */ |
| n = len; |
| } else if (theErr == WSAECONNRESET) { |
| purgeOutstandingICMP(env, this, fd); |
| if (connected == JNI_FALSE) { |
| retry = TRUE; |
| } else { |
| JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0); |
| return IOS_THROWN; |
| } |
| } else if (theErr == WSAEWOULDBLOCK) { |
| return IOS_UNAVAILABLE; |
| } else return handleSocketError(env, theErr); |
| } |
| } while (retry); |
| |
| /* |
| * If the source address and port match the cached address |
| * and port in DatagramChannelImpl then we don't need to |
| * create InetAddress and InetSocketAddress objects. |
| */ |
| senderAddr = (*env)->GetObjectField(env, this, dci_senderAddrID); |
| if (senderAddr != NULL) { |
| if (!NET_SockaddrEqualsInetAddress(env, (struct sockaddr *)&sa, |
| senderAddr)) { |
| senderAddr = NULL; |
| } else { |
| jint port = (*env)->GetIntField(env, this, dci_senderPortID); |
| if (port != NET_GetPortFromSockaddr((struct sockaddr *)&sa)) { |
| senderAddr = NULL; |
| } |
| } |
| } |
| if (senderAddr == NULL) { |
| jobject isa = NULL; |
| int port; |
| jobject ia = NET_SockaddrToInetAddress(env, (struct sockaddr *)&sa, |
| &port); |
| |
| if (ia != NULL) { |
| isa = (*env)->NewObject(env, isa_class, isa_ctorID, ia, port); |
| } |
| |
| if (isa == NULL) { |
| JNU_ThrowOutOfMemoryError(env, "heap allocation failed"); |
| return IOS_THROWN; |
| } |
| |
| // update cachedSenderInetAddress/cachedSenderPort |
| (*env)->SetObjectField(env, this, dci_senderAddrID, ia); |
| (*env)->SetIntField(env, this, dci_senderPortID, |
| NET_GetPortFromSockaddr((struct sockaddr *)&sa)); |
| (*env)->SetObjectField(env, this, dci_senderID, isa); |
| } |
| return n; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_DatagramChannelImpl_send0(JNIEnv *env, jobject this, |
| jboolean preferIPv6, jobject fdo, |
| jlong address, jint len, jobject dest) |
| { |
| jint fd = fdval(env, fdo); |
| void *buf = (void *)jlong_to_ptr(address); |
| SOCKETADDRESS sa; |
| int sa_len; |
| jint rv = 0; |
| jobject destAddress = (*env)->GetObjectField(env, dest, isa_addrID); |
| jint destPort = (*env)->GetIntField(env, dest, isa_portID); |
| |
| if (NET_InetAddressToSockaddr(env, destAddress, destPort, |
| (struct sockaddr *)&sa, |
| &sa_len, preferIPv6) != 0) { |
| return IOS_THROWN; |
| } |
| |
| rv = sendto((SOCKET)fd, |
| buf, |
| len, |
| 0, |
| (struct sockaddr *)&sa, |
| sa_len); |
| if (rv == SOCKET_ERROR) { |
| int theErr = (jint)WSAGetLastError(); |
| if (theErr == WSAEWOULDBLOCK) { |
| return IOS_UNAVAILABLE; |
| } |
| return handleSocketError(env, (jint)WSAGetLastError()); |
| } |
| return rv; |
| } |
