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#include <errno.h>
26#include <stdlib.h>
27#include <string.h>
28
29#include "net_util.h"
30
31#include "java_net_SocketOutputStream.h"
32
33#define min(a, b)       ((a) < (b) ? (a) : (b))
34
35/*
36 * SocketOutputStream
37 */
38
39static jfieldID IO_fd_fdID;
40
41/*
42 * Class:     java_net_SocketOutputStream
43 * Method:    init
44 * Signature: ()V
45 */
46JNIEXPORT void JNICALL
47Java_java_net_SocketOutputStream_init(JNIEnv *env, jclass cls) {
48    IO_fd_fdID = NET_GetFileDescriptorID(env);
49}
50
51/*
52 * Class:     java_net_SocketOutputStream
53 * Method:    socketWrite0
54 * Signature: (Ljava/io/FileDescriptor;[BII)V
55 */
56JNIEXPORT void JNICALL
57Java_java_net_SocketOutputStream_socketWrite0(JNIEnv *env, jobject this,
58                                              jobject fdObj,
59                                              jbyteArray data,
60                                              jint off, jint len) {
61    char *bufP;
62    char BUF[MAX_BUFFER_LEN];
63    int buflen;
64    int fd;
65
66    if (IS_NULL(fdObj)) {
67        JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
68        return;
69    } else {
70        fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
71        /* Bug 4086704 - If the Socket associated with this file descriptor
72         * was closed (sysCloseFD), the file descriptor is set to -1.
73         */
74        if (fd == -1) {
75            JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
76            return;
77        }
78
79    }
80
81    if (len <= MAX_BUFFER_LEN) {
82        bufP = BUF;
83        buflen = MAX_BUFFER_LEN;
84    } else {
85        buflen = min(MAX_HEAP_BUFFER_LEN, len);
86        bufP = (char *)malloc((size_t)buflen);
87
88        /* if heap exhausted resort to stack buffer */
89        if (bufP == NULL) {
90            bufP = BUF;
91            buflen = MAX_BUFFER_LEN;
92        }
93    }
94
95    while(len > 0) {
96        int loff = 0;
97        int chunkLen = min(buflen, len);
98        int llen = chunkLen;
99        (*env)->GetByteArrayRegion(env, data, off, chunkLen, (jbyte *)bufP);
100
101        if ((*env)->ExceptionCheck(env)) {
102            break;
103        } else {
104            while(llen > 0) {
105                int n = NET_Send(fd, bufP + loff, llen, 0);
106                if (n > 0) {
107                    llen -= n;
108                    loff += n;
109                    continue;
110                }
111                if (errno == ECONNRESET) {
112                    JNU_ThrowByName(env, "sun/net/ConnectionResetException",
113                        "Connection reset");
114                } else {
115                    JNU_ThrowByNameWithMessageAndLastError
116                        (env, "java/net/SocketException", "Write failed");
117                }
118                if (bufP != BUF) {
119                    free(bufP);
120                }
121                return;
122            }
123            len -= chunkLen;
124            off += chunkLen;
125        }
126    }
127
128    if (bufP != BUF) {
129        free(bufP);
130    }
131}
132