1/*
2 * Copyright (c) 1997, 2017, 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#include <errno.h>
26#include <stdlib.h>
27#include <string.h>
28
29#include "jvm.h"
30#include "net_util.h"
31
32#include "java_net_SocketInputStream.h"
33
34/*
35 * SocketInputStream
36 */
37
38static jfieldID IO_fd_fdID;
39
40/*
41 * Class:     java_net_SocketInputStream
42 * Method:    init
43 * Signature: ()V
44 */
45JNIEXPORT void JNICALL
46Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) {
47    IO_fd_fdID = NET_GetFileDescriptorID(env);
48}
49
50static int NET_ReadWithTimeout(JNIEnv *env, int fd, char *bufP, int len, long timeout) {
51    int result = 0;
52    jlong prevNanoTime = JVM_NanoTime(env, 0);
53    jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;
54    while (nanoTimeout >= NET_NSEC_PER_MSEC) {
55        result = NET_Timeout(env, fd, nanoTimeout / NET_NSEC_PER_MSEC, prevNanoTime);
56        if (result <= 0) {
57            if (result == 0) {
58                JNU_ThrowByName(env, "java/net/SocketTimeoutException", "Read timed out");
59            } else if (result == -1) {
60                if (errno == EBADF) {
61                    JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
62                } else if (errno == ENOMEM) {
63                    JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed");
64                } else {
65                    JNU_ThrowByNameWithMessageAndLastError
66                            (env, "java/net/SocketException", "select/poll failed");
67                }
68            }
69            return -1;
70        }
71        result = NET_NonBlockingRead(fd, bufP, len);
72        if (result == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
73            jlong newtNanoTime = JVM_NanoTime(env, 0);
74            nanoTimeout -= newtNanoTime - prevNanoTime;
75            if (nanoTimeout >= NET_NSEC_PER_MSEC) {
76                prevNanoTime = newtNanoTime;
77            }
78        } else {
79            break;
80        }
81    }
82    return result;
83}
84
85/*
86 * Class:     java_net_SocketInputStream
87 * Method:    socketRead0
88 * Signature: (Ljava/io/FileDescriptor;[BIII)I
89 */
90JNIEXPORT jint JNICALL
91Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,
92                                            jobject fdObj, jbyteArray data,
93                                            jint off, jint len, jint timeout)
94{
95    char BUF[MAX_BUFFER_LEN];
96    char *bufP;
97    jint fd, nread;
98
99    if (IS_NULL(fdObj)) {
100        JNU_ThrowByName(env, "java/net/SocketException",
101                        "Socket closed");
102        return -1;
103    }
104    fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
105    if (fd == -1) {
106        JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
107        return -1;
108    }
109
110    /*
111     * If the read is greater than our stack allocated buffer then
112     * we allocate from the heap (up to a limit)
113     */
114    if (len > MAX_BUFFER_LEN) {
115        if (len > MAX_HEAP_BUFFER_LEN) {
116            len = MAX_HEAP_BUFFER_LEN;
117        }
118        bufP = (char *)malloc((size_t)len);
119        if (bufP == NULL) {
120            bufP = BUF;
121            len = MAX_BUFFER_LEN;
122        }
123    } else {
124        bufP = BUF;
125    }
126    if (timeout) {
127        nread = NET_ReadWithTimeout(env, fd, bufP, len, timeout);
128        if ((*env)->ExceptionCheck(env)) {
129            if (bufP != BUF) {
130                free(bufP);
131            }
132            return nread;
133        }
134    } else {
135        nread = NET_Read(fd, bufP, len);
136    }
137
138    if (nread <= 0) {
139        if (nread < 0) {
140
141            switch (errno) {
142                case ECONNRESET:
143                case EPIPE:
144                    JNU_ThrowByName(env, "sun/net/ConnectionResetException",
145                        "Connection reset");
146                    break;
147
148                case EBADF:
149                    JNU_ThrowByName(env, "java/net/SocketException",
150                        "Socket closed");
151                    break;
152
153                case EINTR:
154                     JNU_ThrowByName(env, "java/io/InterruptedIOException",
155                           "Operation interrupted");
156                     break;
157                default:
158                    JNU_ThrowByNameWithMessageAndLastError
159                        (env, "java/net/SocketException", "Read failed");
160            }
161        }
162    } else {
163        (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
164    }
165
166    if (bufP != BUF) {
167        free(bufP);
168    }
169    return nread;
170}
171