1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include <stdlib.h> 27 #include <errno.h> 28 #include <string.h> 29 #include <sys/types.h> 30 #include <sys/socket.h> 31 #include <sys/time.h> 32 #include "jvm.h" 33 #include "jni_util.h" 34 #include "net_util.h" 35 36 #include "java_net_SocketInputStream.h" 37 38 /************************************************************************ 39 * SocketInputStream 40 */ 41 42 static jfieldID IO_fd_fdID; 43 44 /* 45 * Class: java_net_SocketInputStream 46 * Method: init 47 * Signature: ()V 48 */ 49 JNIEXPORT void JNICALL 50 Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) { 51 IO_fd_fdID = NET_GetFileDescriptorID(env); 52 } 53 54 static int NET_ReadWithTimeout(JNIEnv *env, int fd, char *bufP, int len, long timeout) { 55 int result = -1; 56 long prevtime = 0, newtime; 57 struct timeval t; 58 gettimeofday(&t, NULL); 59 prevtime = t.tv_sec * 1000 + t.tv_usec / 1000; 60 while (timeout > 0) { 61 result = NET_Timeout(fd, timeout); 62 if (result <= 0) { 63 if (result == 0) { 64 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException", "Read timed out"); 65 } else if (result == -1) { 66 if (errno == EBADF) { 67 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed"); 68 } else if (errno == ENOMEM) { 69 JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed"); 70 } else { 71 JNU_ThrowByNameWithMessageAndLastError 72 (env, JNU_JAVANETPKG "SocketException", "select/poll failed"); 73 } 74 } 75 return -1; 76 } 77 result = NET_NonBlockingRead(fd, bufP, len); 78 if (result == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) { 79 gettimeofday(&t, NULL); 80 newtime = t.tv_sec * 1000 + t.tv_usec / 1000; 81 timeout -= newtime - prevtime; 82 if (timeout > 0) { 83 prevtime = newtime; 84 } 85 } else { 86 break; 87 } 88 } 89 return result; 90 } 91 92 /* 93 * Class: java_net_SocketInputStream 94 * Method: socketRead0 95 * Signature: (Ljava/io/FileDescriptor;[BIII)I 96 */ 97 JNIEXPORT jint JNICALL 98 Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this, 99 jobject fdObj, jbyteArray data, 100 jint off, jint len, jint timeout) 101 { 102 char BUF[MAX_BUFFER_LEN]; 103 char *bufP; 104 jint fd, nread; 105 106 if (IS_NULL(fdObj)) { 107 /* shouldn't this be a NullPointerException? -br */ 108 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", 109 "Socket closed"); 110 return -1; 111 } else { 112 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID); 113 /* Bug 4086704 - If the Socket associated with this file descriptor 114 * was closed (sysCloseFD), then the file descriptor is set to -1. 115 */ 116 if (fd == -1) { 117 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed"); 118 return -1; 119 } 120 } 121 122 /* 123 * If the read is greater than our stack allocated buffer then 124 * we allocate from the heap (up to a limit) 125 */ 126 if (len > MAX_BUFFER_LEN) { 127 if (len > MAX_HEAP_BUFFER_LEN) { 128 len = MAX_HEAP_BUFFER_LEN; 129 } 130 bufP = (char *)malloc((size_t)len); 131 if (bufP == NULL) { 132 bufP = BUF; 133 len = MAX_BUFFER_LEN; 134 } 135 } else { 136 bufP = BUF; 137 } 138 if (timeout) { 139 nread = NET_ReadWithTimeout(env, fd, bufP, len, timeout); 140 } else { 141 nread = NET_Read(fd, bufP, len); 142 } 143 if (nread <= 0) { 144 if (nread < 0) { 145 146 switch (errno) { 147 case ECONNRESET: 148 case EPIPE: 149 JNU_ThrowByName(env, "sun/net/ConnectionResetException", 150 "Connection reset"); 151 break; 152 153 case EBADF: 154 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", 155 "Socket closed"); 156 break; 157 158 case EINTR: 159 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException", 160 "Operation interrupted"); 161 break; 162 default: 163 JNU_ThrowByNameWithMessageAndLastError 164 (env, JNU_JAVANETPKG "SocketException", "Read failed"); 165 } 166 } 167 } else { 168 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP); 169 } 170 171 if (bufP != BUF) { 172 free(bufP); 173 } 174 return nread; 175 }